commit 0a9ea9b391f3391bff6c385d67729b96d79a29d1
author Megan Batty <mgnb@google.com> Wed May 03 14:51:09 2023 -0600
committer Megan Batty <mgnb@google.com> Mon May 08 21:39:20 2023 +0000
tree d54a17440f91a7d03b8d396c3ae11f2f93b3c06c
parent cffb084da3cf9458cdb397ff36107c0afe42af4c

[third_party][jinja2] update to 3.1.2 from chromium

Bug: 126798
Bug: b/278346287

Change-Id: I99df9d6bcff48504ccf5000b8e278aa9d309de79
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/jinja2/+/851956
Reviewed-by: Casey Dahlin <sadmac@google.com>

AUTHORS

diff --git a/AUTHORS b/AUTHORS
deleted file mode 100644
index 943f625..0000000
--- a/AUTHORS
+++ /dev/null
@@ -1,33 +0,0 @@
-Jinja is written and maintained by the Jinja Team and various
-contributors:
-
-Lead Developer:
-
-- Armin Ronacher <armin.ronacher@active-4.com>
-
-Developers:
-
-- Christoph Hack
-- Georg Brandl
-
-Contributors:
-
-- Bryan McLemore
-- Mickaël Guérin <kael@crocobox.org>
-- Cameron Knight
-- Lawrence Journal-World.
-- David Cramer
-
-Patches and suggestions:
-
-- Ronny Pfannschmidt
-- Axel Böhm
-- Alexey Melchakov
-- Bryan McLemore
-- Clovis Fabricio (nosklo)
-- Cameron Knight
-- Peter van Dijk (Habbie)
-- Stefan Ebner
-- Rene Leonhardt
-- Thomas Waldmann
-- Cory Benfield (Lukasa)

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
deleted file mode 100644
index 1157945..0000000
--- a/BUILD.gn
+++ /dev/null
@@ -1,33 +0,0 @@
-# Copyright 2021 The Fuchsia Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("//build/python/python_library.gni")
-
-python_library("jinja2") {
-  sources = [
-    "__init__.py",
-    "_compat.py",
-    "_stringdefs.py",
-    "bccache.py",
-    "compiler.py",
-    "constants.py",
-    "debug.py",
-    "defaults.py",
-    "environment.py",
-    "exceptions.py",
-    "ext.py",
-    "filters.py",
-    "lexer.py",
-    "loaders.py",
-    "meta.py",
-    "nodes.py",
-    "optimizer.py",
-    "parser.py",
-    "runtime.py",
-    "sandbox.py",
-    "tests.py",
-    "utils.py",
-    "visitor.py",
-  ]
-}

DIR_METADATA

diff --git a/DIR_METADATA b/DIR_METADATA
new file mode 100644
index 0000000..8487e40
--- /dev/null
+++ b/DIR_METADATA
@@ -0,0 +1,4 @@
+monorail: {
+  component: "Blink>Bindings"
+}
+team_email: "platform-architecture-dev@chromium.org"

Jinja2-2.7.1.tar.gz.md5

diff --git a/Jinja2-2.7.1.tar.gz.md5 b/Jinja2-2.7.1.tar.gz.md5
deleted file mode 100644
index 5c9e757..0000000
--- a/Jinja2-2.7.1.tar.gz.md5
+++ /dev/null
@@ -1 +0,0 @@
-282aed153e69f970d6e76f78ed9d027a  Jinja2-2.7.1.tar.gz

Jinja2-2.7.1.tar.gz.sha512

diff --git a/Jinja2-2.7.1.tar.gz.sha512 b/Jinja2-2.7.1.tar.gz.sha512
deleted file mode 100644
index 44b486d..0000000
--- a/Jinja2-2.7.1.tar.gz.sha512
+++ /dev/null
@@ -1 +0,0 @@
-c5d4262f6dfec77c74496f0b3afd88a37fc0573133810cfdc29fadbd9d02bb7af10b2a3ddf3075f8b682629cd41a949dcbccb293b84b0aeff9090b0aa9669e02  Jinja2-2.7.1.tar.gz

LICENSE

diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 10145a2..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,31 +0,0 @@
-Copyright (c) 2009 by the Jinja Team, see AUTHORS for more details.

-

-Some rights reserved.

-

-Redistribution and use in source and binary forms, with or without

-modification, are permitted provided that the following conditions are

-met:

-

-    * Redistributions of source code must retain the above copyright

-      notice, this list of conditions and the following disclaimer.

-

-    * Redistributions in binary form must reproduce the above

-      copyright notice, this list of conditions and the following

-      disclaimer in the documentation and/or other materials provided

-      with the distribution.

-

-    * The names of the contributors may not be used to endorse or

-      promote products derived from this software without specific

-      prior written permission.

-

-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LICENSE.rst

diff --git a/LICENSE.rst b/LICENSE.rst
new file mode 100644
index 0000000..c37cae4
--- /dev/null
+++ b/LICENSE.rst
@@ -0,0 +1,28 @@
+Copyright 2007 Pallets
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1.  Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+2.  Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+3.  Neither the name of the copyright holder nor the names of its
+    contributors may be used to endorse or promote products derived from
+    this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.chromium

diff --git a/README.chromium b/README.chromium
deleted file mode 100644
index 9ab2426..0000000
--- a/README.chromium
+++ /dev/null
@@ -1,25 +0,0 @@
-Name: Jinja2 Python Template Engine
-Short Name: jinja2
-URL: http://jinja.pocoo.org/
-Version: 2.7.1
-License: BSD 3-clause License
-License File: NOT_SHIPPED
-Security Critical: no
-
-Description:
-Template engine for code generation in Blink.
-
-Source: https://pypi.python.org/packages/source/J/Jinja2/Jinja2-2.7.1.tar.gz
-MD5: 282aed153e69f970d6e76f78ed9d027a
-SHA-1: a9b24d887f2be772921b3ee30a0b9d435cffadda
-
-Local Modifications:
-This only includes the jinja2 directory from the tarball and the LICENSE and
-AUTHORS files. Unit tests (testsuite directory) have been removed.
-Additional chromium-specific files are:
-* README.chromium (this file)
-* OWNERS
-* install script (get_jinja2.sh)
-* files of hashes (MD5 is also posted on website, SHA-512 computed locally).
-Script checks hash then unpacks archive and installs desired files.
-Retrieve or update by executing jinja2/get_jinja2.sh from third_party.

README.fuchsia

diff --git a/README.fuchsia b/README.fuchsia
index 016f8bd..da4f800 100644
--- a/README.fuchsia
+++ b/README.fuchsia
@@ -1,14 +1,22 @@
-Name: Jinja
-URL: https://github.com/pallets/jinja/archive/2.7.1.tar.gz
-License: BSD
-License File: LICENSE
-Description:
+Name: Jinja2 Python Template Engine
+Short Name: jinja2
+URL: https://jinja.palletsprojects.com/
+Version: 3.1.2
+License: BSD 3-Clause
+License File: LICENSE.rst
+Security Critical: no
 
-Jinja2 is a template engine written in pure Python. It provides a Django
-inspired non-XML syntax but supports inline expressions and an optional
-sandboxed environment.
+Description:
+Template engine for code generation in ffx. Adopted from chromium project's
+equivalent.
+
+Source: https://files.pythonhosted.org/packages/7a/ff/75c28576a1d900e87eb6335b063fab47a8ef3c8b4d88524c4bf78f670cce/Jinja2-3.1.2.tar.gz
+SHA-256: 31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852
 
 Local Modifications:
-Added README.fuchsia.
-Added py_srcs.gni.
-Added BUILD.gn.
+This only includes the src/jinja2/ directory from the tarball and the
+LICENSE.rst and README.rst files.  Other files have been removed.
+Additional fuchsia-specific files are:
+* README.fuchsia (this file)
+* OWNERS
+* py_srcs.gni

README.rst

diff --git a/README.rst b/README.rst
new file mode 100644
index 0000000..a197aea
--- /dev/null
+++ b/README.rst
@@ -0,0 +1,78 @@
+Jinja
+=====
+
+Jinja is a fast, expressive, extensible templating engine. Special
+placeholders in the template allow writing code similar to Python
+syntax. Then the template is passed data to render the final document.
+
+It includes:
+
+-   Template inheritance and inclusion.
+-   Define and import macros within templates.
+-   HTML templates can use autoescaping to prevent XSS from untrusted
+    user input.
+-   A sandboxed environment can safely render untrusted templates.
+-   AsyncIO support for generating templates and calling async
+    functions.
+-   I18N support with Babel.
+-   Templates are compiled to optimized Python code just-in-time and
+    cached, or can be compiled ahead-of-time.
+-   Exceptions point to the correct line in templates to make debugging
+    easier.
+-   Extensible filters, tests, functions, and even syntax.
+
+Jinja's philosophy is that while application logic belongs in Python if
+possible, it shouldn't make the template designer's job difficult by
+restricting functionality too much.
+
+
+Installing
+----------
+
+Install and update using `pip`_:
+
+.. code-block:: text
+
+    $ pip install -U Jinja2
+
+.. _pip: https://pip.pypa.io/en/stable/getting-started/
+
+
+In A Nutshell
+-------------
+
+.. code-block:: jinja
+
+    {% extends "base.html" %}
+    {% block title %}Members{% endblock %}
+    {% block content %}
+      <ul>
+      {% for user in users %}
+        <li><a href="{{ user.url }}">{{ user.username }}</a></li>
+      {% endfor %}
+      </ul>
+    {% endblock %}
+
+
+Donate
+------
+
+The Pallets organization develops and supports Jinja and other popular
+packages. In order to grow the community of contributors and users, and
+allow the maintainers to devote more time to the projects, `please
+donate today`_.
+
+.. _please donate today: https://palletsprojects.com/donate
+
+
+Links
+-----
+
+-   Documentation: https://jinja.palletsprojects.com/
+-   Changes: https://jinja.palletsprojects.com/changes/
+-   PyPI Releases: https://pypi.org/project/Jinja2/
+-   Source Code: https://github.com/pallets/jinja/
+-   Issue Tracker: https://github.com/pallets/jinja/issues/
+-   Website: https://palletsprojects.com/p/jinja/
+-   Twitter: https://twitter.com/PalletsTeam
+-   Chat: https://discord.gg/pallets

__init__.py

diff --git a/__init__.py b/__init__.py
index 6fa11c3..e323926 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1,69 +1,37 @@
-# -*- coding: utf-8 -*-
+"""Jinja is a template engine written in pure Python. It provides a
+non-XML syntax that supports inline expressions and an optional
+sandboxed environment.
 """
-    jinja2
-    ~~~~~~
+from .bccache import BytecodeCache as BytecodeCache
+from .bccache import FileSystemBytecodeCache as FileSystemBytecodeCache
+from .bccache import MemcachedBytecodeCache as MemcachedBytecodeCache
+from .environment import Environment as Environment
+from .environment import Template as Template
+from .exceptions import TemplateAssertionError as TemplateAssertionError
+from .exceptions import TemplateError as TemplateError
+from .exceptions import TemplateNotFound as TemplateNotFound
+from .exceptions import TemplateRuntimeError as TemplateRuntimeError
+from .exceptions import TemplatesNotFound as TemplatesNotFound
+from .exceptions import TemplateSyntaxError as TemplateSyntaxError
+from .exceptions import UndefinedError as UndefinedError
+from .loaders import BaseLoader as BaseLoader
+from .loaders import ChoiceLoader as ChoiceLoader
+from .loaders import DictLoader as DictLoader
+from .loaders import FileSystemLoader as FileSystemLoader
+from .loaders import FunctionLoader as FunctionLoader
+from .loaders import ModuleLoader as ModuleLoader
+from .loaders import PackageLoader as PackageLoader
+from .loaders import PrefixLoader as PrefixLoader
+from .runtime import ChainableUndefined as ChainableUndefined
+from .runtime import DebugUndefined as DebugUndefined
+from .runtime import make_logging_undefined as make_logging_undefined
+from .runtime import StrictUndefined as StrictUndefined
+from .runtime import Undefined as Undefined
+from .utils import clear_caches as clear_caches
+from .utils import is_undefined as is_undefined
+from .utils import pass_context as pass_context
+from .utils import pass_environment as pass_environment
+from .utils import pass_eval_context as pass_eval_context
+from .utils import select_autoescape as select_autoescape
 
-    Jinja2 is a template engine written in pure Python.  It provides a
-    Django inspired non-XML syntax but supports inline expressions and
-    an optional sandboxed environment.
-
-    Nutshell
-    --------
-
-    Here a small example of a Jinja2 template::
-
-        {% extends 'base.html' %}
-        {% block title %}Memberlist{% endblock %}
-        {% block content %}
-          <ul>
-          {% for user in users %}
-            <li><a href="{{ user.url }}">{{ user.username }}</a></li>
-          {% endfor %}
-          </ul>
-        {% endblock %}
-
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-__docformat__ = 'restructuredtext en'
-__version__ = '2.7.1'
-
-# high level interface
-from jinja2.environment import Environment, Template
-
-# loaders
-from jinja2.loaders import BaseLoader, FileSystemLoader, PackageLoader, \
-     DictLoader, FunctionLoader, PrefixLoader, ChoiceLoader, \
-     ModuleLoader
-
-# bytecode caches
-from jinja2.bccache import BytecodeCache, FileSystemBytecodeCache, \
-     MemcachedBytecodeCache
-
-# undefined types
-from jinja2.runtime import Undefined, DebugUndefined, StrictUndefined
-
-# exceptions
-from jinja2.exceptions import TemplateError, UndefinedError, \
-     TemplateNotFound, TemplatesNotFound, TemplateSyntaxError, \
-     TemplateAssertionError
-
-# decorators and public utilities
-from jinja2.filters import environmentfilter, contextfilter, \
-     evalcontextfilter
-from jinja2.utils import Markup, escape, clear_caches, \
-     environmentfunction, evalcontextfunction, contextfunction, \
-     is_undefined
-
-__all__ = [
-    'Environment', 'Template', 'BaseLoader', 'FileSystemLoader',
-    'PackageLoader', 'DictLoader', 'FunctionLoader', 'PrefixLoader',
-    'ChoiceLoader', 'BytecodeCache', 'FileSystemBytecodeCache',
-    'MemcachedBytecodeCache', 'Undefined', 'DebugUndefined',
-    'StrictUndefined', 'TemplateError', 'UndefinedError', 'TemplateNotFound',
-    'TemplatesNotFound', 'TemplateSyntaxError', 'TemplateAssertionError',
-    'ModuleLoader', 'environmentfilter', 'contextfilter', 'Markup', 'escape',
-    'environmentfunction', 'contextfunction', 'clear_caches', 'is_undefined',
-    'evalcontextfilter', 'evalcontextfunction'
-]
+__version__ = "3.1.2"

_compat.py

diff --git a/_compat.py b/_compat.py
deleted file mode 100644
index 8fa8a49..0000000
--- a/_compat.py
+++ /dev/null
@@ -1,150 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2._compat
-    ~~~~~~~~~~~~~~
-
-    Some py2/py3 compatibility support based on a stripped down
-    version of six so we don't have to depend on a specific version
-    of it.
-
-    :copyright: Copyright 2013 by the Jinja team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-import sys
-
-PY2 = sys.version_info[0] == 2
-PYPY = hasattr(sys, 'pypy_translation_info')
-_identity = lambda x: x
-
-
-if not PY2:
-    unichr = chr
-    range_type = range
-    text_type = str
-    string_types = (str,)
-
-    iterkeys = lambda d: iter(d.keys())
-    itervalues = lambda d: iter(d.values())
-    iteritems = lambda d: iter(d.items())
-
-    import pickle
-    from io import BytesIO, StringIO
-    NativeStringIO = StringIO
-
-    def reraise(tp, value, tb=None):
-        if value.__traceback__ is not tb:
-            raise value.with_traceback(tb)
-        raise value
-
-    ifilter = filter
-    imap = map
-    izip = zip
-    intern = sys.intern
-
-    implements_iterator = _identity
-    implements_to_string = _identity
-    encode_filename = _identity
-    get_next = lambda x: x.__next__
-
-else:
-    unichr = unichr
-    text_type = unicode
-    range_type = xrange
-    string_types = (str, unicode)
-
-    iterkeys = lambda d: d.iterkeys()
-    itervalues = lambda d: d.itervalues()
-    iteritems = lambda d: d.iteritems()
-
-    import cPickle as pickle
-    from cStringIO import StringIO as BytesIO, StringIO
-    NativeStringIO = BytesIO
-
-    exec('def reraise(tp, value, tb=None):\n raise tp, value, tb')
-
-    from itertools import imap, izip, ifilter
-    intern = intern
-
-    def implements_iterator(cls):
-        cls.next = cls.__next__
-        del cls.__next__
-        return cls
-
-    def implements_to_string(cls):
-        cls.__unicode__ = cls.__str__
-        cls.__str__ = lambda x: x.__unicode__().encode('utf-8')
-        return cls
-
-    get_next = lambda x: x.next
-
-    def encode_filename(filename):
-        if isinstance(filename, unicode):
-            return filename.encode('utf-8')
-        return filename
-
-try:
-    next = next
-except NameError:
-    def next(it):
-        return it.next()
-
-
-def with_metaclass(meta, *bases):
-    # This requires a bit of explanation: the basic idea is to make a
-    # dummy metaclass for one level of class instanciation that replaces
-    # itself with the actual metaclass.  Because of internal type checks
-    # we also need to make sure that we downgrade the custom metaclass
-    # for one level to something closer to type (that's why __call__ and
-    # __init__ comes back from type etc.).
-    #
-    # This has the advantage over six.with_metaclass in that it does not
-    # introduce dummy classes into the final MRO.
-    class metaclass(meta):
-        __call__ = type.__call__
-        __init__ = type.__init__
-        def __new__(cls, name, this_bases, d):
-            if this_bases is None:
-                return type.__new__(cls, name, (), d)
-            return meta(name, bases, d)
-    return metaclass('temporary_class', None, {})
-
-
-try:
-    from collections import Mapping as mapping_types
-except ImportError:
-    import UserDict
-    mapping_types = (UserDict.UserDict, UserDict.DictMixin, dict)
-
-
-# common types.  These do exist in the special types module too which however
-# does not exist in IronPython out of the box.  Also that way we don't have
-# to deal with implementation specific stuff here
-class _C(object):
-    def method(self): pass
-def _func():
-    yield None
-function_type = type(_func)
-generator_type = type(_func())
-method_type = type(_C().method)
-code_type = type(_C.method.__code__)
-try:
-    raise TypeError()
-except TypeError:
-    _tb = sys.exc_info()[2]
-    traceback_type = type(_tb)
-    frame_type = type(_tb.tb_frame)
-
-
-try:
-    from urllib.parse import quote_from_bytes as url_quote
-except ImportError:
-    from urllib import quote as url_quote
-
-
-try:
-    from thread import allocate_lock
-except ImportError:
-    try:
-        from threading import Lock as allocate_lock
-    except ImportError:
-        from dummy_thread import allocate_lock

_identifier.py

diff --git a/_identifier.py b/_identifier.py
new file mode 100644
index 0000000..928c150
--- /dev/null
+++ b/_identifier.py
@@ -0,0 +1,6 @@
+import re
+
+# generated by scripts/generate_identifier_pattern.py
+pattern = re.compile(
+    r"[\w·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-ٰٟۖ-ۜ۟-۪ۤۧۨ-ܑۭܰ-݊ަ-ް߫-߽߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛࣓-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢॣঁ-ঃ়া-ৄেৈো-্ৗৢৣ৾ਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑੰੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣૺ-૿ଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣஂா-ூெ-ைொ-்ௗఀ-ఄా-ౄె-ైొ-్ౕౖౢౣಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣഀ-ഃ഻഼ാ-ൄെ-ൈൊ-്ൗൢൣංඃ්ා-ුූෘ-ෟෲෳัิ-ฺ็-๎ັິ-ູົຼ່-ໍ༹༘༙༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏႚ-ႝ፝-፟ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝᠋-᠍ᢅᢆᢩᤠ-ᤫᤰ-᤻ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼᪰-᪽ᬀ-ᬄ᬴-᭄᭫-᭳ᮀ-ᮂᮡ-ᮭ᯦-᯳ᰤ-᰷᳐-᳔᳒-᳨᳭ᳲ-᳴᳷-᳹᷀-᷹᷻-᷿‿⁀⁔⃐-⃥⃜⃡-⃰℘℮⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-ꣅ꣠-꣱ꣿꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀ꧥꨩ-ꨶꩃꩌꩍꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭ﬞ︀-️︠-︯︳︴﹍-﹏＿𐇽𐋠𐍶-𐍺𐨁-𐨃𐨅𐨆𐨌-𐨏𐨸-𐨿𐨺𐫦𐫥𐴤-𐽆𐴧-𐽐𑀀-𑀂𑀸-𑁆𑁿-𑂂𑂰-𑂺𑄀-𑄂𑄧-𑄴𑅅𑅆𑅳𑆀-𑆂𑆳-𑇀𑇉-𑇌𑈬-𑈷𑈾𑋟-𑋪𑌀-𑌃𑌻𑌼𑌾-𑍄𑍇𑍈𑍋-𑍍𑍗𑍢𑍣𑍦-𑍬𑍰-𑍴𑐵-𑑆𑑞𑒰-𑓃𑖯-𑖵𑖸-𑗀𑗜𑗝𑘰-𑙀𑚫-𑚷𑜝-𑜫𑠬-𑠺𑨁-𑨊𑨳-𑨹𑨻-𑨾𑩇𑩑-𑩛𑪊-𑪙𑰯-𑰶𑰸-𑰿𑲒-𑲧𑲩-𑲶𑴱-𑴶𑴺𑴼𑴽𑴿-𑵅𑵇𑶊-𑶎𑶐𑶑𑶓-𑶗𑻳-𑻶𖫰-𖫴𖬰-𖬶𖽑-𖽾𖾏-𖾒𛲝𛲞𝅥-𝅩𝅭-𝅲𝅻-𝆂𝆅-𝆋𝆪-𝆭𝉂-𝉄𝨀-𝨶𝨻-𝩬𝩵𝪄𝪛-𝪟𝪡-𝪯𞀀-𞀆𞀈-𞀘𞀛-𞀡𞀣𞀤𞀦-𞣐𞀪-𞣖𞥄-𞥊󠄀-󠇯]+"  # noqa: B950
+)

_stringdefs.py

diff --git a/_stringdefs.py b/_stringdefs.py
deleted file mode 100644
index da5830e..0000000
--- a/_stringdefs.py
+++ /dev/null
@@ -1,132 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2._stringdefs
-    ~~~~~~~~~~~~~~~~~~
-
-    Strings of all Unicode characters of a certain category.
-    Used for matching in Unicode-aware languages. Run to regenerate.
-
-    Inspired by chartypes_create.py from the MoinMoin project, original
-    implementation from Pygments.
-
-    :copyright: Copyright 2006-2009 by the Jinja team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-from jinja2._compat import unichr
-
-Cc = u'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f'
-
-Cf = u'\xad\u0600\u0601\u0602\u0603\u06dd\u070f\u17b4\u17b5\u200b\u200c\u200d\u200e\u200f\u202a\u202b\u202c\u202d\u202e\u2060\u2061\u2062\u2063\u206a\u206b\u206c\u206d\u206e\u206f\ufeff\ufff9\ufffa\ufffb'
-
-Cn = u'\u0242\u0243\u0244\u0245\u0246\u0247\u0248\u0249\u024a\u024b\u024c\u024d\u024e\u024f\u0370\u0371\u0372\u0373\u0376\u0377\u0378\u0379\u037b\u037c\u037d\u037f\u0380\u0381\u0382\u0383\u038b\u038d\u03a2\u03cf\u0487\u04cf\u04fa\u04fb\u04fc\u04fd\u04fe\u04ff\u0510\u0511\u0512\u0513\u0514\u0515\u0516\u0517\u0518\u0519\u051a\u051b\u051c\u051d\u051e\u051f\u0520\u0521\u0522\u0523\u0524\u0525\u0526\u0527\u0528\u0529\u052a\u052b\u052c\u052d\u052e\u052f\u0530\u0557\u0558\u0560\u0588\u058b\u058c\u058d\u058e\u058f\u0590\u05ba\u05c8\u05c9\u05ca\u05cb\u05cc\u05cd\u05ce\u05cf\u05eb\u05ec\u05ed\u05ee\u05ef\u05f5\u05f6\u05f7\u05f8\u05f9\u05fa\u05fb\u05fc\u05fd\u05fe\u05ff\u0604\u0605\u0606\u0607\u0608\u0609\u060a\u0616\u0617\u0618\u0619\u061a\u061c\u061d\u0620\u063b\u063c\u063d\u063e\u063f\u065f\u070e\u074b\u074c\u076e\u076f\u0770\u0771\u0772\u0773\u0774\u0775\u0776\u0777\u0778\u0779\u077a\u077b\u077c\u077d\u077e\u077f\u07b2\u07b3\u07b4\u07b5\u07b6\u07b7\u07b8\u07b9\u07ba\u07bb\u07bc\u07bd\u07be\u07bf\u07c0\u07c1\u07c2\u07c3\u07c4\u07c5\u07c6\u07c7\u07c8\u07c9\u07ca\u07cb\u07cc\u07cd\u07ce\u07cf\u07d0\u07d1\u07d2\u07d3\u07d4\u07d5\u07d6\u07d7\u07d8\u07d9\u07da\u07db\u07dc\u07dd\u07de\u07df\u07e0\u07e1\u07e2\u07e3\u07e4\u07e5\u07e6\u07e7\u07e8\u07e9\u07ea\u07eb\u07ec\u07ed\u07ee\u07ef\u07f0\u07f1\u07f2\u07f3\u07f4\u07f5\u07f6\u07f7\u07f8\u07f9\u07fa\u07fb\u07fc\u07fd\u07fe\u07ff\u0800\u0801\u0802\u0803\u0804\u0805\u0806\u0807\u0808\u0809\u080a\u080b\u080c\u080d\u080e\u080f\u0810\u0811\u0812\u0813\u0814\u0815\u0816\u0817\u0818\u0819\u081a\u081b\u081c\u081d\u081e\u081f\u0820\u0821\u0822\u0823\u0824\u0825\u0826\u0827\u0828\u0829\u082a\u082b\u082c\u082d\u082e\u082f\u0830\u0831\u0832\u0833\u0834\u0835\u0836\u0837\u0838\u0839\u083a\u083b\u083c\u083d\u083e\u083f\u0840\u0841\u0842\u0843\u0844\u0845\u0846\u0847\u0848\u0849\u084a\u084b\u084c\u084d\u084e\u084f\u0850\u0851\u0852\u0853\u0854\u0855\u0856\u0857\u0858\u0859\u085a\u085b\u085c\u085d\u085e\u085f\u0860\u0861\u0862\u0863\u0864\u0865\u0866\u0867\u0868\u0869\u086a\u086b\u086c\u086d\u086e\u086f\u0870\u0871\u0872\u0873\u0874\u0875\u0876\u0877\u0878\u0879\u087a\u087b\u087c\u087d\u087e\u087f\u0880\u0881\u0882\u0883\u0884\u0885\u0886\u0887\u0888\u0889\u088a\u088b\u088c\u088d\u088e\u088f\u0890\u0891\u0892\u0893\u0894\u0895\u0896\u0897\u0898\u0899\u089a\u089b\u089c\u089d\u089e\u089f\u08a0\u08a1\u08a2\u08a3\u08a4\u08a5\u08a6\u08a7\u08a8\u08a9\u08aa\u08ab\u08ac\u08ad\u08ae\u08af\u08b0\u08b1\u08b2\u08b3\u08b4\u08b5\u08b6\u08b7\u08b8\u08b9\u08ba\u08bb\u08bc\u08bd\u08be\u08bf\u08c0\u08c1\u08c2\u08c3\u08c4\u08c5\u08c6\u08c7\u08c8\u08c9\u08ca\u08cb\u08cc\u08cd\u08ce\u08cf\u08d0\u08d1\u08d2\u08d3\u08d4\u08d5\u08d6\u08d7\u08d8\u08d9\u08da\u08db\u08dc\u08dd\u08de\u08df\u08e0\u08e1\u08e2\u08e3\u08e4\u08e5\u08e6\u08e7\u08e8\u08e9\u08ea\u08eb\u08ec\u08ed\u08ee\u08ef\u08f0\u08f1\u08f2\u08f3\u08f4\u08f5\u08f6\u08f7\u08f8\u08f9\u08fa\u08fb\u08fc\u08fd\u08fe\u08ff\u0900\u093a\u093b\u094e\u094f\u0955\u0956\u0957\u0971\u0972\u0973\u0974\u0975\u0976\u0977\u0978\u0979\u097a\u097b\u097c\u097e\u097f\u0980\u0984\u098d\u098e\u0991\u0992\u09a9\u09b1\u09b3\u09b4\u09b5\u09ba\u09bb\u09c5\u09c6\u09c9\u09ca\u09cf\u09d0\u09d1\u09d2\u09d3\u09d4\u09d5\u09d6\u09d8\u09d9\u09da\u09db\u09de\u09e4\u09e5\u09fb\u09fc\u09fd\u09fe\u09ff\u0a00\u0a04\u0a0b\u0a0c\u0a0d\u0a0e\u0a11\u0a12\u0a29\u0a31\u0a34\u0a37\u0a3a\u0a3b\u0a3d\u0a43\u0a44\u0a45\u0a46\u0a49\u0a4a\u0a4e\u0a4f\u0a50\u0a51\u0a52\u0a53\u0a54\u0a55\u0a56\u0a57\u0a58\u0a5d\u0a5f\u0a60\u0a61\u0a62\u0a63\u0a64\u0a65\u0a75\u0a76\u0a77\u0a78\u0a79\u0a7a\u0a7b\u0a7c\u0a7d\u0a7e\u0a7f\u0a80\u0a84\u0a8e\u0a92\u0aa9\u0ab1\u0ab4\u0aba\u0abb\u0ac6\u0aca\u0ace\u0acf\u0ad1\u0ad2\u0ad3\u0ad4\u0ad5\u0ad6\u0ad7\u0ad8\u0ad9\u0ada\u0adb\u0adc\u0add\u0ade\u0adf\u0ae4\u0ae5\u0af0\u0af2\u0af3\u0af4\u0af5\u0af6\u0af7\u0af8\u0af9\u0afa\u0afb\u0afc\u0afd\u0afe\u0aff\u0b00\u0b04\u0b0d\u0b0e\u0b11\u0b12\u0b29\u0b31\u0b34\u0b3a\u0b3b\u0b44\u0b45\u0b46\u0b49\u0b4a\u0b4e\u0b4f\u0b50\u0b51\u0b52\u0b53\u0b54\u0b55\u0b58\u0b59\u0b5a\u0b5b\u0b5e\u0b62\u0b63\u0b64\u0b65\u0b72\u0b73\u0b74\u0b75\u0b76\u0b77\u0b78\u0b79\u0b7a\u0b7b\u0b7c\u0b7d\u0b7e\u0b7f\u0b80\u0b81\u0b84\u0b8b\u0b8c\u0b8d\u0b91\u0b96\u0b97\u0b98\u0b9b\u0b9d\u0ba0\u0ba1\u0ba2\u0ba5\u0ba6\u0ba7\u0bab\u0bac\u0bad\u0bba\u0bbb\u0bbc\u0bbd\u0bc3\u0bc4\u0bc5\u0bc9\u0bce\u0bcf\u0bd0\u0bd1\u0bd2\u0bd3\u0bd4\u0bd5\u0bd6\u0bd8\u0bd9\u0bda\u0bdb\u0bdc\u0bdd\u0bde\u0bdf\u0be0\u0be1\u0be2\u0be3\u0be4\u0be5\u0bfb\u0bfc\u0bfd\u0bfe\u0bff\u0c00\u0c04\u0c0d\u0c11\u0c29\u0c34\u0c3a\u0c3b\u0c3c\u0c3d\u0c45\u0c49\u0c4e\u0c4f\u0c50\u0c51\u0c52\u0c53\u0c54\u0c57\u0c58\u0c59\u0c5a\u0c5b\u0c5c\u0c5d\u0c5e\u0c5f\u0c62\u0c63\u0c64\u0c65\u0c70\u0c71\u0c72\u0c73\u0c74\u0c75\u0c76\u0c77\u0c78\u0c79\u0c7a\u0c7b\u0c7c\u0c7d\u0c7e\u0c7f\u0c80\u0c81\u0c84\u0c8d\u0c91\u0ca9\u0cb4\u0cba\u0cbb\u0cc5\u0cc9\u0cce\u0ccf\u0cd0\u0cd1\u0cd2\u0cd3\u0cd4\u0cd7\u0cd8\u0cd9\u0cda\u0cdb\u0cdc\u0cdd\u0cdf\u0ce2\u0ce3\u0ce4\u0ce5\u0cf0\u0cf1\u0cf2\u0cf3\u0cf4\u0cf5\u0cf6\u0cf7\u0cf8\u0cf9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-
-Co = 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-
-try:
-    Cs = eval(r"'\ud800\ud801\ud802\ud803\ud804\ud805\ud806\ud807\ud808\ud809\ud80a\ud80b\ud80c\ud80d\ud80e\ud80f\ud810\ud811\ud812\ud813\ud814\ud815\ud816\ud817\ud818\ud819\ud81a\ud81b\ud81c\ud81d\ud81e\ud81f\ud820\ud821\ud822\ud823\ud824\ud825\ud826\ud827\ud828\ud829\ud82a\ud82b\ud82c\ud82d\ud82e\ud82f\ud830\ud831\ud832\ud833\ud834\ud835\ud836\ud837\ud838\ud839\ud83a\ud83b\ud83c\ud83d\ud83e\ud83f\ud840\ud841\ud842\ud843\ud844\ud845\ud846\ud847\ud848\ud849\ud84a\ud84b\ud84c\ud84d\ud84e\ud84f\ud850\ud851\ud852\ud853\ud854\ud855\ud856\ud857\ud858\ud859\ud85a\ud85b\ud85c\ud85d\ud85e\ud85f\ud860\ud861\ud862\ud863\ud864\ud865\ud866\ud867\ud868\ud869\ud86a\ud86b\ud86c\ud86d\ud86e\ud86f\ud870\ud871\ud872\ud873\ud874\ud875\ud876\ud877\ud878\ud879\ud87a\ud87b\ud87c\ud87d\ud87e\ud87f\ud880\ud881\ud882\ud883\ud884\ud885\ud886\ud887\ud888\ud889\ud88a\ud88b\ud88c\ud88d\ud88e\ud88f\ud890\ud891\ud892\ud893\ud894\ud895\ud896\ud897\ud898\ud899\ud89a\ud89b\ud89c\ud89d\ud89e\ud89f\ud8a0\ud8a1\ud8a2\ud8a3\ud8a4\ud8a5\ud8a6\ud8a7\ud8a8\ud8a9\ud8aa\ud8ab\ud8ac\ud8ad\ud8ae\ud8af\ud8b0\ud8b1\ud8b2\ud8b3\ud8b4\ud8b5\ud8b6\ud8b7\ud8b8\ud8b9\ud8ba\ud8bb\ud8bc\ud8bd\ud8be\ud8bf\ud8c0\ud8c1\ud8c2\ud8c3\ud8c4\ud8c5\ud8c6\ud8c7\ud8c8\ud8c9\ud8ca\ud8cb\ud8cc\ud8cd\ud8ce\ud8cf\ud8d0\ud8d1\ud8d2\ud8d3\ud8d4\ud8d5\ud8d6\ud8d7\ud8d8\ud8d9\ud8da\ud8db\ud8dc\ud8dd\ud8de\ud8df\ud8e0\ud8e1\ud8e2\ud8e3\ud8e4\ud8e5\ud8e6\ud8e7\ud8e8\ud8e9\ud8ea\ud8eb\ud8ec\ud8ed\ud8ee\ud8ef\ud8f0\ud8f1\ud8f2\ud8f3\ud8f4\ud8f5\ud8f6\ud8f7\ud8f8\ud8f9\ud8fa\ud8fb\ud8fc\ud8fd\ud8fe\ud8ff\ud900\ud901\ud902\ud903\ud904\ud905\ud906\ud907\ud908\ud909\ud90a\ud90b\ud90c\ud90d\ud90e\ud90f\ud910\ud911\ud912\ud913\ud914\ud915\ud916\ud917\ud918\ud919\ud91a\ud91b\ud91c\ud91d\ud91e\ud91f\ud920\ud921\ud922\ud923\ud924\ud925\ud926\ud927\ud928\ud929\ud92a\ud92b\ud92c\ud92d\ud92e\ud92f\ud930\ud931\ud932\ud933\ud934\ud935\ud936\ud937\ud938\ud939\ud93a\ud93b\ud93c\ud93d\ud93e\ud93f\ud940\ud941\ud942\ud943\ud944\ud945\ud946\ud947\ud948\ud949\ud94a\ud94b\ud94c\ud94d\ud94e\ud94f\ud950\ud951\ud952\ud953\ud954\ud955\ud956\ud957\ud958\ud959\ud95a\ud95b\ud95c\ud95d\ud95e\ud95f\ud960\ud961\ud962\ud963\ud964\ud965\ud966\ud967\ud968\ud969\ud96a\ud96b\ud96c\ud96d\ud96e\ud96f\ud970\ud971\ud972\ud973\ud974\ud975\ud976\ud977\ud978\ud979\ud97a\ud97b\ud97c\ud97d\ud97e\ud97f\ud980\ud981\ud982\ud983\ud984\ud985\ud986\ud987\ud988\ud989\ud98a\ud98b\ud98c\ud98d\ud98e\ud98f\ud990\ud991\ud992\ud993\ud994\ud995\ud996\ud997\ud998\ud999\ud99a\ud99b\ud99c\ud99d\ud99e\ud99f\ud9a0\ud9a1\ud9a2\ud9a3\ud9a4\ud9a5\ud9a6\ud9a7\ud9a8\ud9a9\ud9aa\ud9ab\ud9ac\ud9ad\ud9ae\ud9af\ud9b0\ud9b1\ud9b2\ud9b3\ud9b4\ud9b5\ud9b6\ud9b7\ud9b8\ud9b9\ud9ba\ud9bb\ud9bc\ud9bd\ud9be\ud9bf\ud9c0\ud9c1\ud9c2\ud9c3\ud9c4\ud9c5\ud9c6\ud9c7\ud9c8\ud9c9\ud9ca\ud9cb\ud9cc\ud9cd\ud9ce\ud9cf\ud9d0\ud9d1\ud9d2\ud9d3\ud9d4\ud9d5\ud9d6\ud9d7\ud9d8\ud9d9\ud9da\ud9db\ud9dc\ud9dd\ud9de\ud9df\ud9e0\ud9e1\ud9e2\ud9e3\ud9e4\ud9e5\ud9e6\ud9e7\ud9e8\ud9e9\ud9ea\ud9eb\ud9ec\ud9ed\ud9ee\ud9ef\ud9f0\ud9f1\ud9f2\ud9f3\ud9f4\ud9f5\ud9f6\ud9f7\ud9f8\ud9f9\ud9fa\ud9fb\ud9fc\ud9fd\ud9fe\ud9ff\uda00\uda01\uda02\uda03\uda04\uda05\uda06\uda07\uda08\uda09\uda0a\uda0b\uda0c\uda0d\uda0e\uda0f\uda10\uda11\uda12\uda13\uda14\uda15\uda16\uda17\uda18\uda19\uda1a\uda1b\uda1c\uda1d\uda1e\uda1f\uda20\uda21\uda22\uda23\uda24\uda25\uda26\uda27\uda28\uda29\uda2a\uda2b\uda2c\uda2d\uda2e\uda2f\uda30\uda31\uda32\uda33\uda34\uda35\uda36\uda37\uda38\uda39\uda3a\uda3b\uda3c\uda3d\uda3e\uda3f\uda40\uda41\uda42\uda43\uda44\uda45\uda46\uda47\uda48\uda49\uda4a\uda4b\uda4c\uda4d\uda4e\uda4f\uda50\uda51\uda52\uda53\uda54\uda55\uda56\uda57\uda58\uda59\uda5a\uda5b\uda5c\uda5d\uda5e\uda5f\uda60\uda61\uda62\uda63\uda64\uda65\uda66\uda67\uda68\uda69\uda6a\uda6b\uda6c\uda6d\uda6e\uda6f\uda70\uda71\uda72\uda73\uda74\uda75\uda76\uda77\uda78\uda79\uda7a\uda7b\uda7c\uda7d\uda7e\uda7f\uda80\uda81\uda82\uda83\uda84\uda85\uda86\uda87\uda88\uda89\uda8a\uda8b\uda8c\uda8d\uda8e\uda8f\uda90\uda91\uda92\uda93\uda94\uda95\uda96\uda97\uda98\uda99\uda9a\uda9b\uda9c\uda9d\uda9e\uda9f\udaa0\udaa1\udaa2\udaa3\udaa4\udaa5\udaa6\udaa7\udaa8\udaa9\udaaa\udaab\udaac\udaad\udaae\udaaf\udab0\udab1\udab2\udab3\udab4\udab5\udab6\udab7\udab8\udab9\udaba\udabb\udabc\udabd\udabe\udabf\udac0\udac1\udac2\udac3\udac4\udac5\udac6\udac7\udac8\udac9\udaca\udacb\udacc\udacd\udace\udacf\udad0\udad1\udad2\udad3\udad4\udad5\udad6\udad7\udad8\udad9\udada\udadb\udadc\udadd\udade\udadf\udae0\udae1\udae2\udae3\udae4\udae5\udae6\udae7\udae8\udae9\udaea\udaeb\udaec\udaed\udaee\udaef\udaf0\udaf1\udaf2\udaf3\udaf4\udaf5\udaf6\udaf7\udaf8\udaf9\udafa\udafb\udafc\udafd\udafe\udaff\udb00\udb01\udb02\udb03\udb04\udb05\udb06\udb07\udb08\udb09\udb0a\udb0b\udb0c\udb0d\udb0e\udb0f\udb10\udb11\udb12\udb13\udb14\udb15\udb16\udb17\udb18\udb19\udb1a\udb1b\udb1c\udb1d\udb1e\udb1f\udb20\udb21\udb22\udb23\udb24\udb25\udb26\udb27\udb28\udb29\udb2a\udb2b\udb2c\udb2d\udb2e\udb2f\udb30\udb31\udb32\udb33\udb34\udb35\udb36\udb37\udb38\udb39\udb3a\udb3b\udb3c\udb3d\udb3e\udb3f\udb40\udb41\udb42\udb43\udb44\udb45\udb46\udb47\udb48\udb49\udb4a\udb4b\udb4c\udb4d\udb4e\udb4f\udb50\udb51\udb52\udb53\udb54\udb55\udb56\udb57\udb58\udb59\udb5a\udb5b\udb5c\udb5d\udb5e\udb5f\udb60\udb61\udb62\udb63\udb64\udb65\udb66\udb67\udb68\udb69\udb6a\udb6b\udb6c\udb6d\udb6e\udb6f\udb70\udb71\udb72\udb73\udb74\udb75\udb76\udb77\udb78\udb79\udb7a\udb7b\udb7c\udb7d\udb7e\udb7f\udb80\udb81\udb82\udb83\udb84\udb85\udb86\udb87\udb88\udb89\udb8a\udb8b\udb8c\udb8d\udb8e\udb8f\udb90\udb91\udb92\udb93\udb94\udb95\udb96\udb97\udb98\udb99\udb9a\udb9b\udb9c\udb9d\udb9e\udb9f\udba0\udba1\udba2\udba3\udba4\udba5\udba6\udba7\udba8\udba9\udbaa\udbab\udbac\udbad\udbae\udbaf\udbb0\udbb1\udbb2\udbb3\udbb4\udbb5\udbb6\udbb7\udbb8\udbb9\udbba\udbbb\udbbc\udbbd\udbbe\udbbf\udbc0\udbc1\udbc2\udbc3\udbc4\udbc5\udbc6\udbc7\udbc8\udbc9\udbca\udbcb\udbcc\udbcd\udbce\udbcf\udbd0\udbd1\udbd2\udbd3\udbd4\udbd5\udbd6\udbd7\udbd8\udbd9\udbda\udbdb\udbdc\udbdd\udbde\udbdf\udbe0\udbe1\udbe2\udbe3\udbe4\udbe5\udbe6\udbe7\udbe8\udbe9\udbea\udbeb\udbec\udbed\udbee\udbef\udbf0\udbf1\udbf2\udbf3\udbf4\udbf5\udbf6\udbf7\udbf8\udbf9\udbfa\udbfb\udbfc\udbfd\udbfe\U0010fc00\udc01\udc02\udc03\udc04\udc05\udc06\udc07\udc08\udc09\udc0a\udc0b\udc0c\udc0d\udc0e\udc0f\udc10\udc11\udc12\udc13\udc14\udc15\udc16\udc17\udc18\udc19\udc1a\udc1b\udc1c\udc1d\udc1e\udc1f\udc20\udc21\udc22\udc23\udc24\udc25\udc26\udc27\udc28\udc29\udc2a\udc2b\udc2c\udc2d\udc2e\udc2f\udc30\udc31\udc32\udc33\udc34\udc35\udc36\udc37\udc38\udc39\udc3a\udc3b\udc3c\udc3d\udc3e\udc3f\udc40\udc41\udc42\udc43\udc44\udc45\udc46\udc47\udc48\udc49\udc4a\udc4b\udc4c\udc4d\udc4e\udc4f\udc50\udc51\udc52\udc53\udc54\udc55\udc56\udc57\udc58\udc59\udc5a\udc5b\udc5c\udc5d\udc5e\udc5f\udc60\udc61\udc62\udc63\udc64\udc65\udc66\udc67\udc68\udc69\udc6a\udc6b\udc6c\udc6d\udc6e\udc6f\udc70\udc71\udc72\udc73\udc74\udc75\udc76\udc77\udc78\udc79\udc7a\udc7b\udc7c\udc7d\udc7e\udc7f\udc80\udc81\udc82\udc83\udc84\udc85\udc86\udc87\udc88\udc89\udc8a\udc8b\udc8c\udc8d\udc8e\udc8f\udc90\udc91\udc92\udc93\udc94\udc95\udc96\udc97\udc98\udc99\udc9a\udc9b\udc9c\udc9d\udc9e\udc9f\udca0\udca1\udca2\udca3\udca4\udca5\udca6\udca7\udca8\udca9\udcaa\udcab\udcac\udcad\udcae\udcaf\udcb0\udcb1\udcb2\udcb3\udcb4\udcb5\udcb6\udcb7\udcb8\udcb9\udcba\udcbb\udcbc\udcbd\udcbe\udcbf\udcc0\udcc1\udcc2\udcc3\udcc4\udcc5\udcc6\udcc7\udcc8\udcc9\udcca\udccb\udccc\udccd\udcce\udccf\udcd0\udcd1\udcd2\udcd3\udcd4\udcd5\udcd6\udcd7\udcd8\udcd9\udcda\udcdb\udcdc\udcdd\udcde\udcdf\udce0\udce1\udce2\udce3\udce4\udce5\udce6\udce7\udce8\udce9\udcea\udceb\udcec\udced\udcee\udcef\udcf0\udcf1\udcf2\udcf3\udcf4\udcf5\udcf6\udcf7\udcf8\udcf9\udcfa\udcfb\udcfc\udcfd\udcfe\udcff\udd00\udd01\udd02\udd03\udd04\udd05\udd06\udd07\udd08\udd09\udd0a\udd0b\udd0c\udd0d\udd0e\udd0f\udd10\udd11\udd12\udd13\udd14\udd15\udd16\udd17\udd18\udd19\udd1a\udd1b\udd1c\udd1d\udd1e\udd1f\udd20\udd21\udd22\udd23\udd24\udd25\udd26\udd27\udd28\udd29\udd2a\udd2b\udd2c\udd2d\udd2e\udd2f\udd30\udd31\udd32\udd33\udd34\udd35\udd36\udd37\udd38\udd39\udd3a\udd3b\udd3c\udd3d\udd3e\udd3f\udd40\udd41\udd42\udd43\udd44\udd45\udd46\udd47\udd48\udd49\udd4a\udd4b\udd4c\udd4d\udd4e\udd4f\udd50\udd51\udd52\udd53\udd54\udd55\udd56\udd57\udd58\udd59\udd5a\udd5b\udd5c\udd5d\udd5e\udd5f\udd60\udd61\udd62\udd63\udd64\udd65\udd66\udd67\udd68\udd69\udd6a\udd6b\udd6c\udd6d\udd6e\udd6f\udd70\udd71\udd72\udd73\udd74\udd75\udd76\udd77\udd78\udd79\udd7a\udd7b\udd7c\udd7d\udd7e\udd7f\udd80\udd81\udd82\udd83\udd84\udd85\udd86\udd87\udd88\udd89\udd8a\udd8b\udd8c\udd8d\udd8e\udd8f\udd90\udd91\udd92\udd93\udd94\udd95\udd96\udd97\udd98\udd99\udd9a\udd9b\udd9c\udd9d\udd9e\udd9f\udda0\udda1\udda2\udda3\udda4\udda5\udda6\udda7\udda8\udda9\uddaa\uddab\uddac\uddad\uddae\uddaf\uddb0\uddb1\uddb2\uddb3\uddb4\uddb5\uddb6\uddb7\uddb8\uddb9\uddba\uddbb\uddbc\uddbd\uddbe\uddbf\uddc0\uddc1\uddc2\uddc3\uddc4\uddc5\uddc6\uddc7\uddc8\uddc9\uddca\uddcb\uddcc\uddcd\uddce\uddcf\uddd0\uddd1\uddd2\uddd3\uddd4\uddd5\uddd6\uddd7\uddd8\uddd9\uddda\udddb\udddc\udddd\uddde\udddf\udde0\udde1\udde2\udde3\udde4\udde5\udde6\udde7\udde8\udde9\uddea\uddeb\uddec\udded\uddee\uddef\uddf0\uddf1\uddf2\uddf3\uddf4\uddf5\uddf6\uddf7\uddf8\uddf9\uddfa\uddfb\uddfc\uddfd\uddfe\uddff\ude00\ude01\ude02\ude03\ude04\ude05\ude06\ude07\ude08\ude09\ude0a\ude0b\ude0c\ude0d\ude0e\ude0f\ude10\ude11\ude12\ude13\ude14\ude15\ude16\ude17\ude18\ude19\ude1a\ude1b\ude1c\ude1d\ude1e\ude1f\ude20\ude21\ude22\ude23\ude24\ude25\ude26\ude27\ude28\ude29\ude2a\ude2b\ude2c\ude2d\ude2e\ude2f\ude30\ude31\ude32\ude33\ude34\ude35\ude36\ude37\ude38\ude39\ude3a\ude3b\ude3c\ude3d\ude3e\ude3f\ude40\ude41\ude42\ude43\ude44\ude45\ude46\ude47\ude48\ude49\ude4a\ude4b\ude4c\ude4d\ude4e\ude4f\ude50\ude51\ude52\ude53\ude54\ude55\ude56\ude57\ude58\ude59\ude5a\ude5b\ude5c\ude5d\ude5e\ude5f\ude60\ude61\ude62\ude63\ude64\ude65\ude66\ude67\ude68\ude69\ude6a\ude6b\ude6c\ude6d\ude6e\ude6f\ude70\ude71\ude72\ude73\ude74\ude75\ude76\ude77\ude78\ude79\ude7a\ude7b\ude7c\ude7d\ude7e\ude7f\ude80\ude81\ude82\ude83\ude84\ude85\ude86\ude87\ude88\ude89\ude8a\ude8b\ude8c\ude8d\ude8e\ude8f\ude90\ude91\ude92\ude93\ude94\ude95\ude96\ude97\ude98\ude99\ude9a\ude9b\ude9c\ude9d\ude9e\ude9f\udea0\udea1\udea2\udea3\udea4\udea5\udea6\udea7\udea8\udea9\udeaa\udeab\udeac\udead\udeae\udeaf\udeb0\udeb1\udeb2\udeb3\udeb4\udeb5\udeb6\udeb7\udeb8\udeb9\udeba\udebb\udebc\udebd\udebe\udebf\udec0\udec1\udec2\udec3\udec4\udec5\udec6\udec7\udec8\udec9\udeca\udecb\udecc\udecd\udece\udecf\uded0\uded1\uded2\uded3\uded4\uded5\uded6\uded7\uded8\uded9\udeda\udedb\udedc\udedd\udede\udedf\udee0\udee1\udee2\udee3\udee4\udee5\udee6\udee7\udee8\udee9\udeea\udeeb\udeec\udeed\udeee\udeef\udef0\udef1\udef2\udef3\udef4\udef5\udef6\udef7\udef8\udef9\udefa\udefb\udefc\udefd\udefe\udeff\udf00\udf01\udf02\udf03\udf04\udf05\udf06\udf07\udf08\udf09\udf0a\udf0b\udf0c\udf0d\udf0e\udf0f\udf10\udf11\udf12\udf13\udf14\udf15\udf16\udf17\udf18\udf19\udf1a\udf1b\udf1c\udf1d\udf1e\udf1f\udf20\udf21\udf22\udf23\udf24\udf25\udf26\udf27\udf28\udf29\udf2a\udf2b\udf2c\udf2d\udf2e\udf2f\udf30\udf31\udf32\udf33\udf34\udf35\udf36\udf37\udf38\udf39\udf3a\udf3b\udf3c\udf3d\udf3e\udf3f\udf40\udf41\udf42\udf43\udf44\udf45\udf46\udf47\udf48\udf49\udf4a\udf4b\udf4c\udf4d\udf4e\udf4f\udf50\udf51\udf52\udf53\udf54\udf55\udf56\udf57\udf58\udf59\udf5a\udf5b\udf5c\udf5d\udf5e\udf5f\udf60\udf61\udf62\udf63\udf64\udf65\udf66\udf67\udf68\udf69\udf6a\udf6b\udf6c\udf6d\udf6e\udf6f\udf70\udf71\udf72\udf73\udf74\udf75\udf76\udf77\udf78\udf79\udf7a\udf7b\udf7c\udf7d\udf7e\udf7f\udf80\udf81\udf82\udf83\udf84\udf85\udf86\udf87\udf88\udf89\udf8a\udf8b\udf8c\udf8d\udf8e\udf8f\udf90\udf91\udf92\udf93\udf94\udf95\udf96\udf97\udf98\udf99\udf9a\udf9b\udf9c\udf9d\udf9e\udf9f\udfa0\udfa1\udfa2\udfa3\udfa4\udfa5\udfa6\udfa7\udfa8\udfa9\udfaa\udfab\udfac\udfad\udfae\udfaf\udfb0\udfb1\udfb2\udfb3\udfb4\udfb5\udfb6\udfb7\udfb8\udfb9\udfba\udfbb\udfbc\udfbd\udfbe\udfbf\udfc0\udfc1\udfc2\udfc3\udfc4\udfc5\udfc6\udfc7\udfc8\udfc9\udfca\udfcb\udfcc\udfcd\udfce\udfcf\udfd0\udfd1\udfd2\udfd3\udfd4\udfd5\udfd6\udfd7\udfd8\udfd9\udfda\udfdb\udfdc\udfdd\udfde\udfdf\udfe0\udfe1\udfe2\udfe3\udfe4\udfe5\udfe6\udfe7\udfe8\udfe9\udfea\udfeb\udfec\udfed\udfee\udfef\udff0\udff1\udff2\udff3\udff4\udff5\udff6\udff7\udff8\udff9\udffa\udffb\udffc\udffd\udffe\udfff'")
-except UnicodeDecodeError:
-    Cs = '' # Jython can't handle isolated surrogates
-
-Ll = u'abcdefghijklmnopqrstuvwxyz\xaa\xb5\xba\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff\u0101\u0103\u0105\u0107\u0109\u010b\u010d\u010f\u0111\u0113\u0115\u0117\u0119\u011b\u011d\u011f\u0121\u0123\u0125\u0127\u0129\u012b\u012d\u012f\u0131\u0133\u0135\u0137\u0138\u013a\u013c\u013e\u0140\u0142\u0144\u0146\u0148\u0149\u014b\u014d\u014f\u0151\u0153\u0155\u0157\u0159\u015b\u015d\u015f\u0161\u0163\u0165\u0167\u0169\u016b\u016d\u016f\u0171\u0173\u0175\u0177\u017a\u017c\u017e\u017f\u0180\u0183\u0185\u0188\u018c\u018d\u0192\u0195\u0199\u019a\u019b\u019e\u01a1\u01a3\u01a5\u01a8\u01aa\u01ab\u01ad\u01b0\u01b4\u01b6\u01b9\u01ba\u01bd\u01be\u01bf\u01c6\u01c9\u01cc\u01ce\u01d0\u01d2\u01d4\u01d6\u01d8\u01da\u01dc\u01dd\u01df\u01e1\u01e3\u01e5\u01e7\u01e9\u01eb\u01ed\u01ef\u01f0\u01f3\u01f5\u01f9\u01fb\u01fd\u01ff\u0201\u0203\u0205\u0207\u0209\u020b\u020d\u020f\u0211\u0213\u0215\u0217\u0219\u021b\u021d\u021f\u0221\u0223\u0225\u0227\u0229\u022b\u022d\u022f\u0231\u0233\u0234\u0235\u0236\u0237\u0238\u0239\u023c\u023f\u0240\u0250\u0251\u0252\u0253\u0254\u0255\u0256\u0257\u0258\u0259\u025a\u025b\u025c\u025d\u025e\u025f\u0260\u0261\u0262\u0263\u0264\u0265\u0266\u0267\u0268\u0269\u026a\u026b\u026c\u026d\u026e\u026f\u0270\u0271\u0272\u0273\u0274\u0275\u0276\u0277\u0278\u0279\u027a\u027b\u027c\u027d\u027e\u027f\u0280\u0281\u0282\u0283\u0284\u0285\u0286\u0287\u0288\u0289\u028a\u028b\u028c\u028d\u028e\u028f\u0290\u0291\u0292\u0293\u0294\u0295\u0296\u0297\u0298\u0299\u029a\u029b\u029c\u029d\u029e\u029f\u02a0\u02a1\u02a2\u02a3\u02a4\u02a5\u02a6\u02a7\u02a8\u02a9\u02aa\u02ab\u02ac\u02ad\u02ae\u02af\u0390\u03ac\u03ad\u03ae\u03af\u03b0\u03b1\u03b2\u03b3\u03b4\u03b5\u03b6\u03b7\u03b8\u03b9\u03ba\u03bb\u03bc\u03bd\u03be\u03bf\u03c0\u03c1\u03c2\u03c3\u03c4\u03c5\u03c6\u03c7\u03c8\u03c9\u03ca\u03cb\u03cc\u03cd\u03ce\u03d0\u03d1\u03d5\u03d6\u03d7\u03d9\u03db\u03dd\u03df\u03e1\u03e3\u03e5\u03e7\u03e9\u03eb\u03ed\u03ef\u03f0\u03f1\u03f2\u03f3\u03f5\u03f8\u03fb\u03fc\u0430\u0431\u0432\u0433\u0434\u0435\u0436\u0437\u0438\u0439\u043a\u043b\u043c\u043d\u043e\u043f\u0440\u0441\u0442\u0443\u0444\u0445\u0446\u0447\u0448\u0449\u044a\u044b\u044c\u044d\u044e\u044f\u0450\u0451\u0452\u0453\u0454\u0455\u0456\u0457\u0458\u0459\u045a\u045b\u045c\u045d\u045e\u045f\u0461\u0463\u0465\u0467\u0469\u046b\u046d\u046f\u0471\u0473\u0475\u0477\u0479\u047b\u047d\u047f\u0481\u048b\u048d\u048f\u0491\u0493\u0495\u0497\u0499\u049b\u049d\u049f\u04a1\u04a3\u04a5\u04a7\u04a9\u04ab\u04ad\u04af\u04b1\u04b3\u04b5\u04b7\u04b9\u04bb\u04bd\u04bf\u04c2\u04c4\u04c6\u04c8\u04ca\u04cc\u04ce\u04d1\u04d3\u04d5\u04d7\u04d9\u04db\u04dd\u04df\u04e1\u04e3\u04e5\u04e7\u04e9\u04eb\u04ed\u04ef\u04f1\u04f3\u04f5\u04f7\u04f9\u0501\u0503\u0505\u0507\u0509\u050b\u050d\u050f\u0561\u0562\u0563\u0564\u0565\u0566\u0567\u0568\u0569\u056a\u056b\u056c\u056d\u056e\u056f\u0570\u0571\u0572\u0573\u0574\u0575\u0576\u0577\u0578\u0579\u057a\u057b\u057c\u057d\u057e\u057f\u0580\u0581\u0582\u0583\u0584\u0585\u0586\u0587\u1d00\u1d01\u1d02\u1d03\u1d04\u1d05\u1d06\u1d07\u1d08\u1d09\u1d0a\u1d0b\u1d0c\u1d0d\u1d0e\u1d0f\u1d10\u1d11\u1d12\u1d13\u1d14\u1d15\u1d16\u1d17\u1d18\u1d19\u1d1a\u1d1b\u1d1c\u1d1d\u1d1e\u1d1f\u1d20\u1d21\u1d22\u1d23\u1d24\u1d25\u1d26\u1d27\u1d28\u1d29\u1d2a\u1d2b\u1d62\u1d63\u1d64\u1d65\u1d66\u1d67\u1d68\u1d69\u1d6a\u1d6b\u1d6c\u1d6d\u1d6e\u1d6f\u1d70\u1d71\u1d72\u1d73\u1d74\u1d75\u1d76\u1d77\u1d79\u1d7a\u1d7b\u1d7c\u1d7d\u1d7e\u1d7f\u1d80\u1d81\u1d82\u1d83\u1d84\u1d85\u1d86\u1d87\u1d88\u1d89\u1d8a\u1d8b\u1d8c\u1d8d\u1d8e\u1d8f\u1d90\u1d91\u1d92\u1d93\u1d94\u1d95\u1d96\u1d97\u1d98\u1d99\u1d9a\u1e01\u1e03\u1e05\u1e07\u1e09\u1e0b\u1e0d\u1e0f\u1e11\u1e13\u1e15\u1e17\u1e19\u1e1b\u1e1d\u1e1f\u1e21\u1e23\u1e25\u1e27\u1e29\u1e2b\u1e2d\u1e2f\u1e31\u1e33\u1e35\u1e37\u1e39\u1e3b\u1e3d\u1e3f\u1e41\u1e43\u1e45\u1e47\u1e49\u1e4b\u1e4d\u1e4f\u1e51\u1e53\u1e55\u1e57\u1e59\u1e5b\u1e5d\u1e5f\u1e61\u1e63\u1e65\u1e67\u1e69\u1e6b\u1e6d\u1e6f\u1e71\u1e73\u1e75\u1e77\u1e79\u1e7b\u1e7d\u1e7f\u1e81\u1e83\u1e85\u1e87\u1e89\u1e8b\u1e8d\u1e8f\u1e91\u1e93\u1e95\u1e96\u1e97\u1e98\u1e99\u1e9a\u1e9b\u1ea1\u1ea3\u1ea5\u1ea7\u1ea9\u1eab\u1ead\u1eaf\u1eb1\u1eb3\u1eb5\u1eb7\u1eb9\u1ebb\u1ebd\u1ebf\u1ec1\u1ec3\u1ec5\u1ec7\u1ec9\u1ecb\u1ecd\u1ecf\u1ed1\u1ed3\u1ed5\u1ed7\u1ed9\u1edb\u1edd\u1edf\u1ee1\u1ee3\u1ee5\u1ee7\u1ee9\u1eeb\u1eed\u1eef\u1ef1\u1ef3\u1ef5\u1ef7\u1ef9\u1f00\u1f01\u1f02\u1f03\u1f04\u1f05\u1f06\u1f07\u1f10\u1f11\u1f12\u1f13\u1f14\u1f15\u1f20\u1f21\u1f22\u1f23\u1f24\u1f25\u1f26\u1f27\u1f30\u1f31\u1f32\u1f33\u1f34\u1f35\u1f36\u1f37\u1f40\u1f41\u1f42\u1f43\u1f44\u1f45\u1f50\u1f51\u1f52\u1f53\u1f54\u1f55\u1f56\u1f57\u1f60\u1f61\u1f62\u1f63\u1f64\u1f65\u1f66\u1f67\u1f70\u1f71\u1f72\u1f73\u1f74\u1f75\u1f76\u1f77\u1f78\u1f79\u1f7a\u1f7b\u1f7c\u1f7d\u1f80\u1f81\u1f82\u1f83\u1f84\u1f85\u1f86\u1f87\u1f90\u1f91\u1f92\u1f93\u1f94\u1f95\u1f96\u1f97\u1fa0\u1fa1\u1fa2\u1fa3\u1fa4\u1fa5\u1fa6\u1fa7\u1fb0\u1fb1\u1fb2\u1fb3\u1fb4\u1fb6\u1fb7\u1fbe\u1fc2\u1fc3\u1fc4\u1fc6\u1fc7\u1fd0\u1fd1\u1fd2\u1fd3\u1fd6\u1fd7\u1fe0\u1fe1\u1fe2\u1fe3\u1fe4\u1fe5\u1fe6\u1fe7\u1ff2\u1ff3\u1ff4\u1ff6\u1ff7\u2071\u207f\u210a\u210e\u210f\u2113\u212f\u2134\u2139\u213c\u213d\u2146\u2147\u2148\u2149\u2c30\u2c31\u2c32\u2c33\u2c34\u2c35\u2c36\u2c37\u2c38\u2c39\u2c3a\u2c3b\u2c3c\u2c3d\u2c3e\u2c3f\u2c40\u2c41\u2c42\u2c43\u2c44\u2c45\u2c46\u2c47\u2c48\u2c49\u2c4a\u2c4b\u2c4c\u2c4d\u2c4e\u2c4f\u2c50\u2c51\u2c52\u2c53\u2c54\u2c55\u2c56\u2c57\u2c58\u2c59\u2c5a\u2c5b\u2c5c\u2c5d\u2c5e\u2c81\u2c83\u2c85\u2c87\u2c89\u2c8b\u2c8d\u2c8f\u2c91\u2c93\u2c95\u2c97\u2c99\u2c9b\u2c9d\u2c9f\u2ca1\u2ca3\u2ca5\u2ca7\u2ca9\u2cab\u2cad\u2caf\u2cb1\u2cb3\u2cb5\u2cb7\u2cb9\u2cbb\u2cbd\u2cbf\u2cc1\u2cc3\u2cc5\u2cc7\u2cc9\u2ccb\u2ccd\u2ccf\u2cd1\u2cd3\u2cd5\u2cd7\u2cd9\u2cdb\u2cdd\u2cdf\u2ce1\u2ce3\u2ce4\u2d00\u2d01\u2d02\u2d03\u2d04\u2d05\u2d06\u2d07\u2d08\u2d09\u2d0a\u2d0b\u2d0c\u2d0d\u2d0e\u2d0f\u2d10\u2d11\u2d12\u2d13\u2d14\u2d15\u2d16\u2d17\u2d18\u2d19\u2d1a\u2d1b\u2d1c\u2d1d\u2d1e\u2d1f\u2d20\u2d21\u2d22\u2d23\u2d24\u2d25\ufb00\ufb01\ufb02\ufb03\ufb04\ufb05\ufb06\ufb13\ufb14\ufb15\ufb16\ufb17\uff41\uff42\uff43\uff44\uff45\uff46\uff47\uff48\uff49\uff4a\uff4b\uff4c\uff4d\uff4e\uff4f\uff50\uff51\uff52\uff53\uff54\uff55\uff56\uff57\uff58\uff59\uff5a'
-
-Lm = u'\u02b0\u02b1\u02b2\u02b3\u02b4\u02b5\u02b6\u02b7\u02b8\u02b9\u02ba\u02bb\u02bc\u02bd\u02be\u02bf\u02c0\u02c1\u02c6\u02c7\u02c8\u02c9\u02ca\u02cb\u02cc\u02cd\u02ce\u02cf\u02d0\u02d1\u02e0\u02e1\u02e2\u02e3\u02e4\u02ee\u037a\u0559\u0640\u06e5\u06e6\u0e46\u0ec6\u10fc\u17d7\u1843\u1d2c\u1d2d\u1d2e\u1d2f\u1d30\u1d31\u1d32\u1d33\u1d34\u1d35\u1d36\u1d37\u1d38\u1d39\u1d3a\u1d3b\u1d3c\u1d3d\u1d3e\u1d3f\u1d40\u1d41\u1d42\u1d43\u1d44\u1d45\u1d46\u1d47\u1d48\u1d49\u1d4a\u1d4b\u1d4c\u1d4d\u1d4e\u1d4f\u1d50\u1d51\u1d52\u1d53\u1d54\u1d55\u1d56\u1d57\u1d58\u1d59\u1d5a\u1d5b\u1d5c\u1d5d\u1d5e\u1d5f\u1d60\u1d61\u1d78\u1d9b\u1d9c\u1d9d\u1d9e\u1d9f\u1da0\u1da1\u1da2\u1da3\u1da4\u1da5\u1da6\u1da7\u1da8\u1da9\u1daa\u1dab\u1dac\u1dad\u1dae\u1daf\u1db0\u1db1\u1db2\u1db3\u1db4\u1db5\u1db6\u1db7\u1db8\u1db9\u1dba\u1dbb\u1dbc\u1dbd\u1dbe\u1dbf\u2090\u2091\u2092\u2093\u2094\u2d6f\u3005\u3031\u3032\u3033\u3034\u3035\u303b\u309d\u309e\u30fc\u30fd\u30fe\ua015\uff70\uff9e\uff9f'
-
-Lo = 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-
-Lt = u'\u01c5\u01c8\u01cb\u01f2\u1f88\u1f89\u1f8a\u1f8b\u1f8c\u1f8d\u1f8e\u1f8f\u1f98\u1f99\u1f9a\u1f9b\u1f9c\u1f9d\u1f9e\u1f9f\u1fa8\u1fa9\u1faa\u1fab\u1fac\u1fad\u1fae\u1faf\u1fbc\u1fcc\u1ffc'
-
-Lu = u'ABCDEFGHIJKLMNOPQRSTUVWXYZ\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd8\xd9\xda\xdb\xdc\xdd\xde\u0100\u0102\u0104\u0106\u0108\u010a\u010c\u010e\u0110\u0112\u0114\u0116\u0118\u011a\u011c\u011e\u0120\u0122\u0124\u0126\u0128\u012a\u012c\u012e\u0130\u0132\u0134\u0136\u0139\u013b\u013d\u013f\u0141\u0143\u0145\u0147\u014a\u014c\u014e\u0150\u0152\u0154\u0156\u0158\u015a\u015c\u015e\u0160\u0162\u0164\u0166\u0168\u016a\u016c\u016e\u0170\u0172\u0174\u0176\u0178\u0179\u017b\u017d\u0181\u0182\u0184\u0186\u0187\u0189\u018a\u018b\u018e\u018f\u0190\u0191\u0193\u0194\u0196\u0197\u0198\u019c\u019d\u019f\u01a0\u01a2\u01a4\u01a6\u01a7\u01a9\u01ac\u01ae\u01af\u01b1\u01b2\u01b3\u01b5\u01b7\u01b8\u01bc\u01c4\u01c7\u01ca\u01cd\u01cf\u01d1\u01d3\u01d5\u01d7\u01d9\u01db\u01de\u01e0\u01e2\u01e4\u01e6\u01e8\u01ea\u01ec\u01ee\u01f1\u01f4\u01f6\u01f7\u01f8\u01fa\u01fc\u01fe\u0200\u0202\u0204\u0206\u0208\u020a\u020c\u020e\u0210\u0212\u0214\u0216\u0218\u021a\u021c\u021e\u0220\u0222\u0224\u0226\u0228\u022a\u022c\u022e\u0230\u0232\u023a\u023b\u023d\u023e\u0241\u0386\u0388\u0389\u038a\u038c\u038e\u038f\u0391\u0392\u0393\u0394\u0395\u0396\u0397\u0398\u0399\u039a\u039b\u039c\u039d\u039e\u039f\u03a0\u03a1\u03a3\u03a4\u03a5\u03a6\u03a7\u03a8\u03a9\u03aa\u03ab\u03d2\u03d3\u03d4\u03d8\u03da\u03dc\u03de\u03e0\u03e2\u03e4\u03e6\u03e8\u03ea\u03ec\u03ee\u03f4\u03f7\u03f9\u03fa\u03fd\u03fe\u03ff\u0400\u0401\u0402\u0403\u0404\u0405\u0406\u0407\u0408\u0409\u040a\u040b\u040c\u040d\u040e\u040f\u0410\u0411\u0412\u0413\u0414\u0415\u0416\u0417\u0418\u0419\u041a\u041b\u041c\u041d\u041e\u041f\u0420\u0421\u0422\u0423\u0424\u0425\u0426\u0427\u0428\u0429\u042a\u042b\u042c\u042d\u042e\u042f\u0460\u0462\u0464\u0466\u0468\u046a\u046c\u046e\u0470\u0472\u0474\u0476\u0478\u047a\u047c\u047e\u0480\u048a\u048c\u048e\u0490\u0492\u0494\u0496\u0498\u049a\u049c\u049e\u04a0\u04a2\u04a4\u04a6\u04a8\u04aa\u04ac\u04ae\u04b0\u04b2\u04b4\u04b6\u04b8\u04ba\u04bc\u04be\u04c0\u04c1\u04c3\u04c5\u04c7\u04c9\u04cb\u04cd\u04d0\u04d2\u04d4\u04d6\u04d8\u04da\u04dc\u04de\u04e0\u04e2\u04e4\u04e6\u04e8\u04ea\u04ec\u04ee\u04f0\u04f2\u04f4\u04f6\u04f8\u0500\u0502\u0504\u0506\u0508\u050a\u050c\u050e\u0531\u0532\u0533\u0534\u0535\u0536\u0537\u0538\u0539\u053a\u053b\u053c\u053d\u053e\u053f\u0540\u0541\u0542\u0543\u0544\u0545\u0546\u0547\u0548\u0549\u054a\u054b\u054c\u054d\u054e\u054f\u0550\u0551\u0552\u0553\u0554\u0555\u0556\u10a0\u10a1\u10a2\u10a3\u10a4\u10a5\u10a6\u10a7\u10a8\u10a9\u10aa\u10ab\u10ac\u10ad\u10ae\u10af\u10b0\u10b1\u10b2\u10b3\u10b4\u10b5\u10b6\u10b7\u10b8\u10b9\u10ba\u10bb\u10bc\u10bd\u10be\u10bf\u10c0\u10c1\u10c2\u10c3\u10c4\u10c5\u1e00\u1e02\u1e04\u1e06\u1e08\u1e0a\u1e0c\u1e0e\u1e10\u1e12\u1e14\u1e16\u1e18\u1e1a\u1e1c\u1e1e\u1e20\u1e22\u1e24\u1e26\u1e28\u1e2a\u1e2c\u1e2e\u1e30\u1e32\u1e34\u1e36\u1e38\u1e3a\u1e3c\u1e3e\u1e40\u1e42\u1e44\u1e46\u1e48\u1e4a\u1e4c\u1e4e\u1e50\u1e52\u1e54\u1e56\u1e58\u1e5a\u1e5c\u1e5e\u1e60\u1e62\u1e64\u1e66\u1e68\u1e6a\u1e6c\u1e6e\u1e70\u1e72\u1e74\u1e76\u1e78\u1e7a\u1e7c\u1e7e\u1e80\u1e82\u1e84\u1e86\u1e88\u1e8a\u1e8c\u1e8e\u1e90\u1e92\u1e94\u1ea0\u1ea2\u1ea4\u1ea6\u1ea8\u1eaa\u1eac\u1eae\u1eb0\u1eb2\u1eb4\u1eb6\u1eb8\u1eba\u1ebc\u1ebe\u1ec0\u1ec2\u1ec4\u1ec6\u1ec8\u1eca\u1ecc\u1ece\u1ed0\u1ed2\u1ed4\u1ed6\u1ed8\u1eda\u1edc\u1ede\u1ee0\u1ee2\u1ee4\u1ee6\u1ee8\u1eea\u1eec\u1eee\u1ef0\u1ef2\u1ef4\u1ef6\u1ef8\u1f08\u1f09\u1f0a\u1f0b\u1f0c\u1f0d\u1f0e\u1f0f\u1f18\u1f19\u1f1a\u1f1b\u1f1c\u1f1d\u1f28\u1f29\u1f2a\u1f2b\u1f2c\u1f2d\u1f2e\u1f2f\u1f38\u1f39\u1f3a\u1f3b\u1f3c\u1f3d\u1f3e\u1f3f\u1f48\u1f49\u1f4a\u1f4b\u1f4c\u1f4d\u1f59\u1f5b\u1f5d\u1f5f\u1f68\u1f69\u1f6a\u1f6b\u1f6c\u1f6d\u1f6e\u1f6f\u1fb8\u1fb9\u1fba\u1fbb\u1fc8\u1fc9\u1fca\u1fcb\u1fd8\u1fd9\u1fda\u1fdb\u1fe8\u1fe9\u1fea\u1feb\u1fec\u1ff8\u1ff9\u1ffa\u1ffb\u2102\u2107\u210b\u210c\u210d\u2110\u2111\u2112\u2115\u2119\u211a\u211b\u211c\u211d\u2124\u2126\u2128\u212a\u212b\u212c\u212d\u2130\u2131\u2133\u213e\u213f\u2145\u2c00\u2c01\u2c02\u2c03\u2c04\u2c05\u2c06\u2c07\u2c08\u2c09\u2c0a\u2c0b\u2c0c\u2c0d\u2c0e\u2c0f\u2c10\u2c11\u2c12\u2c13\u2c14\u2c15\u2c16\u2c17\u2c18\u2c19\u2c1a\u2c1b\u2c1c\u2c1d\u2c1e\u2c1f\u2c20\u2c21\u2c22\u2c23\u2c24\u2c25\u2c26\u2c27\u2c28\u2c29\u2c2a\u2c2b\u2c2c\u2c2d\u2c2e\u2c80\u2c82\u2c84\u2c86\u2c88\u2c8a\u2c8c\u2c8e\u2c90\u2c92\u2c94\u2c96\u2c98\u2c9a\u2c9c\u2c9e\u2ca0\u2ca2\u2ca4\u2ca6\u2ca8\u2caa\u2cac\u2cae\u2cb0\u2cb2\u2cb4\u2cb6\u2cb8\u2cba\u2cbc\u2cbe\u2cc0\u2cc2\u2cc4\u2cc6\u2cc8\u2cca\u2ccc\u2cce\u2cd0\u2cd2\u2cd4\u2cd6\u2cd8\u2cda\u2cdc\u2cde\u2ce0\u2ce2\uff21\uff22\uff23\uff24\uff25\uff26\uff27\uff28\uff29\uff2a\uff2b\uff2c\uff2d\uff2e\uff2f\uff30\uff31\uff32\uff33\uff34\uff35\uff36\uff37\uff38\uff39\uff3a'
-
-Mc = u'\u0903\u093e\u093f\u0940\u0949\u094a\u094b\u094c\u0982\u0983\u09be\u09bf\u09c0\u09c7\u09c8\u09cb\u09cc\u09d7\u0a03\u0a3e\u0a3f\u0a40\u0a83\u0abe\u0abf\u0ac0\u0ac9\u0acb\u0acc\u0b02\u0b03\u0b3e\u0b40\u0b47\u0b48\u0b4b\u0b4c\u0b57\u0bbe\u0bbf\u0bc1\u0bc2\u0bc6\u0bc7\u0bc8\u0bca\u0bcb\u0bcc\u0bd7\u0c01\u0c02\u0c03\u0c41\u0c42\u0c43\u0c44\u0c82\u0c83\u0cbe\u0cc0\u0cc1\u0cc2\u0cc3\u0cc4\u0cc7\u0cc8\u0cca\u0ccb\u0cd5\u0cd6\u0d02\u0d03\u0d3e\u0d3f\u0d40\u0d46\u0d47\u0d48\u0d4a\u0d4b\u0d4c\u0d57\u0d82\u0d83\u0dcf\u0dd0\u0dd1\u0dd8\u0dd9\u0dda\u0ddb\u0ddc\u0ddd\u0dde\u0ddf\u0df2\u0df3\u0f3e\u0f3f\u0f7f\u102c\u1031\u1038\u1056\u1057\u17b6\u17be\u17bf\u17c0\u17c1\u17c2\u17c3\u17c4\u17c5\u17c7\u17c8\u1923\u1924\u1925\u1926\u1929\u192a\u192b\u1930\u1931\u1933\u1934\u1935\u1936\u1937\u1938\u19b0\u19b1\u19b2\u19b3\u19b4\u19b5\u19b6\u19b7\u19b8\u19b9\u19ba\u19bb\u19bc\u19bd\u19be\u19bf\u19c0\u19c8\u19c9\u1a19\u1a1a\u1a1b\ua802\ua823\ua824\ua827'
-
-Me = u'\u0488\u0489\u06de\u20dd\u20de\u20df\u20e0\u20e2\u20e3\u20e4'
-
-Mn = u'\u0300\u0301\u0302\u0303\u0304\u0305\u0306\u0307\u0308\u0309\u030a\u030b\u030c\u030d\u030e\u030f\u0310\u0311\u0312\u0313\u0314\u0315\u0316\u0317\u0318\u0319\u031a\u031b\u031c\u031d\u031e\u031f\u0320\u0321\u0322\u0323\u0324\u0325\u0326\u0327\u0328\u0329\u032a\u032b\u032c\u032d\u032e\u032f\u0330\u0331\u0332\u0333\u0334\u0335\u0336\u0337\u0338\u0339\u033a\u033b\u033c\u033d\u033e\u033f\u0340\u0341\u0342\u0343\u0344\u0345\u0346\u0347\u0348\u0349\u034a\u034b\u034c\u034d\u034e\u034f\u0350\u0351\u0352\u0353\u0354\u0355\u0356\u0357\u0358\u0359\u035a\u035b\u035c\u035d\u035e\u035f\u0360\u0361\u0362\u0363\u0364\u0365\u0366\u0367\u0368\u0369\u036a\u036b\u036c\u036d\u036e\u036f\u0483\u0484\u0485\u0486\u0591\u0592\u0593\u0594\u0595\u0596\u0597\u0598\u0599\u059a\u059b\u059c\u059d\u059e\u059f\u05a0\u05a1\u05a2\u05a3\u05a4\u05a5\u05a6\u05a7\u05a8\u05a9\u05aa\u05ab\u05ac\u05ad\u05ae\u05af\u05b0\u05b1\u05b2\u05b3\u05b4\u05b5\u05b6\u05b7\u05b8\u05b9\u05bb\u05bc\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610\u0611\u0612\u0613\u0614\u0615\u064b\u064c\u064d\u064e\u064f\u0650\u0651\u0652\u0653\u0654\u0655\u0656\u0657\u0658\u0659\u065a\u065b\u065c\u065d\u065e\u0670\u06d6\u06d7\u06d8\u06d9\u06da\u06db\u06dc\u06df\u06e0\u06e1\u06e2\u06e3\u06e4\u06e7\u06e8\u06ea\u06eb\u06ec\u06ed\u0711\u0730\u0731\u0732\u0733\u0734\u0735\u0736\u0737\u0738\u0739\u073a\u073b\u073c\u073d\u073e\u073f\u0740\u0741\u0742\u0743\u0744\u0745\u0746\u0747\u0748\u0749\u074a\u07a6\u07a7\u07a8\u07a9\u07aa\u07ab\u07ac\u07ad\u07ae\u07af\u07b0\u0901\u0902\u093c\u0941\u0942\u0943\u0944\u0945\u0946\u0947\u0948\u094d\u0951\u0952\u0953\u0954\u0962\u0963\u0981\u09bc\u09c1\u09c2\u09c3\u09c4\u09cd\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b\u0a4c\u0a4d\u0a70\u0a71\u0a81\u0a82\u0abc\u0ac1\u0ac2\u0ac3\u0ac4\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3f\u0b41\u0b42\u0b43\u0b4d\u0b56\u0b82\u0bc0\u0bcd\u0c3e\u0c3f\u0c40\u0c46\u0c47\u0c48\u0c4a\u0c4b\u0c4c\u0c4d\u0c55\u0c56\u0cbc\u0cbf\u0cc6\u0ccc\u0ccd\u0d41\u0d42\u0d43\u0d4d\u0dca\u0dd2\u0dd3\u0dd4\u0dd6\u0e31\u0e34\u0e35\u0e36\u0e37\u0e38\u0e39\u0e3a\u0e47\u0e48\u0e49\u0e4a\u0e4b\u0e4c\u0e4d\u0e4e\u0eb1\u0eb4\u0eb5\u0eb6\u0eb7\u0eb8\u0eb9\u0ebb\u0ebc\u0ec8\u0ec9\u0eca\u0ecb\u0ecc\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71\u0f72\u0f73\u0f74\u0f75\u0f76\u0f77\u0f78\u0f79\u0f7a\u0f7b\u0f7c\u0f7d\u0f7e\u0f80\u0f81\u0f82\u0f83\u0f84\u0f86\u0f87\u0f90\u0f91\u0f92\u0f93\u0f94\u0f95\u0f96\u0f97\u0f99\u0f9a\u0f9b\u0f9c\u0f9d\u0f9e\u0f9f\u0fa0\u0fa1\u0fa2\u0fa3\u0fa4\u0fa5\u0fa6\u0fa7\u0fa8\u0fa9\u0faa\u0fab\u0fac\u0fad\u0fae\u0faf\u0fb0\u0fb1\u0fb2\u0fb3\u0fb4\u0fb5\u0fb6\u0fb7\u0fb8\u0fb9\u0fba\u0fbb\u0fbc\u0fc6\u102d\u102e\u102f\u1030\u1032\u1036\u1037\u1039\u1058\u1059\u135f\u1712\u1713\u1714\u1732\u1733\u1734\u1752\u1753\u1772\u1773\u17b7\u17b8\u17b9\u17ba\u17bb\u17bc\u17bd\u17c6\u17c9\u17ca\u17cb\u17cc\u17cd\u17ce\u17cf\u17d0\u17d1\u17d2\u17d3\u17dd\u180b\u180c\u180d\u18a9\u1920\u1921\u1922\u1927\u1928\u1932\u1939\u193a\u193b\u1a17\u1a18\u1dc0\u1dc1\u1dc2\u1dc3\u20d0\u20d1\u20d2\u20d3\u20d4\u20d5\u20d6\u20d7\u20d8\u20d9\u20da\u20db\u20dc\u20e1\u20e5\u20e6\u20e7\u20e8\u20e9\u20ea\u20eb\u302a\u302b\u302c\u302d\u302e\u302f\u3099\u309a\ua806\ua80b\ua825\ua826\ufb1e\ufe00\ufe01\ufe02\ufe03\ufe04\ufe05\ufe06\ufe07\ufe08\ufe09\ufe0a\ufe0b\ufe0c\ufe0d\ufe0e\ufe0f\ufe20\ufe21\ufe22\ufe23'
-
-Nd = u'0123456789\u0660\u0661\u0662\u0663\u0664\u0665\u0666\u0667\u0668\u0669\u06f0\u06f1\u06f2\u06f3\u06f4\u06f5\u06f6\u06f7\u06f8\u06f9\u0966\u0967\u0968\u0969\u096a\u096b\u096c\u096d\u096e\u096f\u09e6\u09e7\u09e8\u09e9\u09ea\u09eb\u09ec\u09ed\u09ee\u09ef\u0a66\u0a67\u0a68\u0a69\u0a6a\u0a6b\u0a6c\u0a6d\u0a6e\u0a6f\u0ae6\u0ae7\u0ae8\u0ae9\u0aea\u0aeb\u0aec\u0aed\u0aee\u0aef\u0b66\u0b67\u0b68\u0b69\u0b6a\u0b6b\u0b6c\u0b6d\u0b6e\u0b6f\u0be6\u0be7\u0be8\u0be9\u0bea\u0beb\u0bec\u0bed\u0bee\u0bef\u0c66\u0c67\u0c68\u0c69\u0c6a\u0c6b\u0c6c\u0c6d\u0c6e\u0c6f\u0ce6\u0ce7\u0ce8\u0ce9\u0cea\u0ceb\u0cec\u0ced\u0cee\u0cef\u0d66\u0d67\u0d68\u0d69\u0d6a\u0d6b\u0d6c\u0d6d\u0d6e\u0d6f\u0e50\u0e51\u0e52\u0e53\u0e54\u0e55\u0e56\u0e57\u0e58\u0e59\u0ed0\u0ed1\u0ed2\u0ed3\u0ed4\u0ed5\u0ed6\u0ed7\u0ed8\u0ed9\u0f20\u0f21\u0f22\u0f23\u0f24\u0f25\u0f26\u0f27\u0f28\u0f29\u1040\u1041\u1042\u1043\u1044\u1045\u1046\u1047\u1048\u1049\u17e0\u17e1\u17e2\u17e3\u17e4\u17e5\u17e6\u17e7\u17e8\u17e9\u1810\u1811\u1812\u1813\u1814\u1815\u1816\u1817\u1818\u1819\u1946\u1947\u1948\u1949\u194a\u194b\u194c\u194d\u194e\u194f\u19d0\u19d1\u19d2\u19d3\u19d4\u19d5\u19d6\u19d7\u19d8\u19d9\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19'
-
-Nl = u'\u16ee\u16ef\u16f0\u2160\u2161\u2162\u2163\u2164\u2165\u2166\u2167\u2168\u2169\u216a\u216b\u216c\u216d\u216e\u216f\u2170\u2171\u2172\u2173\u2174\u2175\u2176\u2177\u2178\u2179\u217a\u217b\u217c\u217d\u217e\u217f\u2180\u2181\u2182\u2183\u3007\u3021\u3022\u3023\u3024\u3025\u3026\u3027\u3028\u3029\u3038\u3039\u303a'
-
-No = u'\xb2\xb3\xb9\xbc\xbd\xbe\u09f4\u09f5\u09f6\u09f7\u09f8\u09f9\u0bf0\u0bf1\u0bf2\u0f2a\u0f2b\u0f2c\u0f2d\u0f2e\u0f2f\u0f30\u0f31\u0f32\u0f33\u1369\u136a\u136b\u136c\u136d\u136e\u136f\u1370\u1371\u1372\u1373\u1374\u1375\u1376\u1377\u1378\u1379\u137a\u137b\u137c\u17f0\u17f1\u17f2\u17f3\u17f4\u17f5\u17f6\u17f7\u17f8\u17f9\u2070\u2074\u2075\u2076\u2077\u2078\u2079\u2080\u2081\u2082\u2083\u2084\u2085\u2086\u2087\u2088\u2089\u2153\u2154\u2155\u2156\u2157\u2158\u2159\u215a\u215b\u215c\u215d\u215e\u215f\u2460\u2461\u2462\u2463\u2464\u2465\u2466\u2467\u2468\u2469\u246a\u246b\u246c\u246d\u246e\u246f\u2470\u2471\u2472\u2473\u2474\u2475\u2476\u2477\u2478\u2479\u247a\u247b\u247c\u247d\u247e\u247f\u2480\u2481\u2482\u2483\u2484\u2485\u2486\u2487\u2488\u2489\u248a\u248b\u248c\u248d\u248e\u248f\u2490\u2491\u2492\u2493\u2494\u2495\u2496\u2497\u2498\u2499\u249a\u249b\u24ea\u24eb\u24ec\u24ed\u24ee\u24ef\u24f0\u24f1\u24f2\u24f3\u24f4\u24f5\u24f6\u24f7\u24f8\u24f9\u24fa\u24fb\u24fc\u24fd\u24fe\u24ff\u2776\u2777\u2778\u2779\u277a\u277b\u277c\u277d\u277e\u277f\u2780\u2781\u2782\u2783\u2784\u2785\u2786\u2787\u2788\u2789\u278a\u278b\u278c\u278d\u278e\u278f\u2790\u2791\u2792\u2793\u2cfd\u3192\u3193\u3194\u3195\u3220\u3221\u3222\u3223\u3224\u3225\u3226\u3227\u3228\u3229\u3251\u3252\u3253\u3254\u3255\u3256\u3257\u3258\u3259\u325a\u325b\u325c\u325d\u325e\u325f\u3280\u3281\u3282\u3283\u3284\u3285\u3286\u3287\u3288\u3289\u32b1\u32b2\u32b3\u32b4\u32b5\u32b6\u32b7\u32b8\u32b9\u32ba\u32bb\u32bc\u32bd\u32be\u32bf'
-
-Pc = u'_\u203f\u2040\u2054\ufe33\ufe34\ufe4d\ufe4e\ufe4f\uff3f'
-
-Pd = u'-\u058a\u1806\u2010\u2011\u2012\u2013\u2014\u2015\u2e17\u301c\u3030\u30a0\ufe31\ufe32\ufe58\ufe63\uff0d'
-
-Pe = u')]}\u0f3b\u0f3d\u169c\u2046\u207e\u208e\u232a\u23b5\u2769\u276b\u276d\u276f\u2771\u2773\u2775\u27c6\u27e7\u27e9\u27eb\u2984\u2986\u2988\u298a\u298c\u298e\u2990\u2992\u2994\u2996\u2998\u29d9\u29db\u29fd\u3009\u300b\u300d\u300f\u3011\u3015\u3017\u3019\u301b\u301e\u301f\ufd3f\ufe18\ufe36\ufe38\ufe3a\ufe3c\ufe3e\ufe40\ufe42\ufe44\ufe48\ufe5a\ufe5c\ufe5e\uff09\uff3d\uff5d\uff60\uff63'
-
-Pf = u'\xbb\u2019\u201d\u203a\u2e03\u2e05\u2e0a\u2e0d\u2e1d'
-
-Pi = u'\xab\u2018\u201b\u201c\u201f\u2039\u2e02\u2e04\u2e09\u2e0c\u2e1c'
-
-Po = u'!"#%&\'*,./:;?@\\\xa1\xb7\xbf\u037e\u0387\u055a\u055b\u055c\u055d\u055e\u055f\u0589\u05be\u05c0\u05c3\u05c6\u05f3\u05f4\u060c\u060d\u061b\u061e\u061f\u066a\u066b\u066c\u066d\u06d4\u0700\u0701\u0702\u0703\u0704\u0705\u0706\u0707\u0708\u0709\u070a\u070b\u070c\u070d\u0964\u0965\u0970\u0df4\u0e4f\u0e5a\u0e5b\u0f04\u0f05\u0f06\u0f07\u0f08\u0f09\u0f0a\u0f0b\u0f0c\u0f0d\u0f0e\u0f0f\u0f10\u0f11\u0f12\u0f85\u0fd0\u0fd1\u104a\u104b\u104c\u104d\u104e\u104f\u10fb\u1361\u1362\u1363\u1364\u1365\u1366\u1367\u1368\u166d\u166e\u16eb\u16ec\u16ed\u1735\u1736\u17d4\u17d5\u17d6\u17d8\u17d9\u17da\u1800\u1801\u1802\u1803\u1804\u1805\u1807\u1808\u1809\u180a\u1944\u1945\u19de\u19df\u1a1e\u1a1f\u2016\u2017\u2020\u2021\u2022\u2023\u2024\u2025\u2026\u2027\u2030\u2031\u2032\u2033\u2034\u2035\u2036\u2037\u2038\u203b\u203c\u203d\u203e\u2041\u2042\u2043\u2047\u2048\u2049\u204a\u204b\u204c\u204d\u204e\u204f\u2050\u2051\u2053\u2055\u2056\u2057\u2058\u2059\u205a\u205b\u205c\u205d\u205e\u23b6\u2cf9\u2cfa\u2cfb\u2cfc\u2cfe\u2cff\u2e00\u2e01\u2e06\u2e07\u2e08\u2e0b\u2e0e\u2e0f\u2e10\u2e11\u2e12\u2e13\u2e14\u2e15\u2e16\u3001\u3002\u3003\u303d\u30fb\ufe10\ufe11\ufe12\ufe13\ufe14\ufe15\ufe16\ufe19\ufe30\ufe45\ufe46\ufe49\ufe4a\ufe4b\ufe4c\ufe50\ufe51\ufe52\ufe54\ufe55\ufe56\ufe57\ufe5f\ufe60\ufe61\ufe68\ufe6a\ufe6b\uff01\uff02\uff03\uff05\uff06\uff07\uff0a\uff0c\uff0e\uff0f\uff1a\uff1b\uff1f\uff20\uff3c\uff61\uff64\uff65'
-
-Ps = u'([{\u0f3a\u0f3c\u169b\u201a\u201e\u2045\u207d\u208d\u2329\u23b4\u2768\u276a\u276c\u276e\u2770\u2772\u2774\u27c5\u27e6\u27e8\u27ea\u2983\u2985\u2987\u2989\u298b\u298d\u298f\u2991\u2993\u2995\u2997\u29d8\u29da\u29fc\u3008\u300a\u300c\u300e\u3010\u3014\u3016\u3018\u301a\u301d\ufd3e\ufe17\ufe35\ufe37\ufe39\ufe3b\ufe3d\ufe3f\ufe41\ufe43\ufe47\ufe59\ufe5b\ufe5d\uff08\uff3b\uff5b\uff5f\uff62'
-
-Sc = u'$\xa2\xa3\xa4\xa5\u060b\u09f2\u09f3\u0af1\u0bf9\u0e3f\u17db\u20a0\u20a1\u20a2\u20a3\u20a4\u20a5\u20a6\u20a7\u20a8\u20a9\u20aa\u20ab\u20ac\u20ad\u20ae\u20af\u20b0\u20b1\u20b2\u20b3\u20b4\u20b5\ufdfc\ufe69\uff04\uffe0\uffe1\uffe5\uffe6'
-
-Sk = u'^`\xa8\xaf\xb4\xb8\u02c2\u02c3\u02c4\u02c5\u02d2\u02d3\u02d4\u02d5\u02d6\u02d7\u02d8\u02d9\u02da\u02db\u02dc\u02dd\u02de\u02df\u02e5\u02e6\u02e7\u02e8\u02e9\u02ea\u02eb\u02ec\u02ed\u02ef\u02f0\u02f1\u02f2\u02f3\u02f4\u02f5\u02f6\u02f7\u02f8\u02f9\u02fa\u02fb\u02fc\u02fd\u02fe\u02ff\u0374\u0375\u0384\u0385\u1fbd\u1fbf\u1fc0\u1fc1\u1fcd\u1fce\u1fcf\u1fdd\u1fde\u1fdf\u1fed\u1fee\u1fef\u1ffd\u1ffe\u309b\u309c\ua700\ua701\ua702\ua703\ua704\ua705\ua706\ua707\ua708\ua709\ua70a\ua70b\ua70c\ua70d\ua70e\ua70f\ua710\ua711\ua712\ua713\ua714\ua715\ua716\uff3e\uff40\uffe3'
-
-Sm = u'+<=>|~\xac\xb1\xd7\xf7\u03f6\u2044\u2052\u207a\u207b\u207c\u208a\u208b\u208c\u2140\u2141\u2142\u2143\u2144\u214b\u2190\u2191\u2192\u2193\u2194\u219a\u219b\u21a0\u21a3\u21a6\u21ae\u21ce\u21cf\u21d2\u21d4\u21f4\u21f5\u21f6\u21f7\u21f8\u21f9\u21fa\u21fb\u21fc\u21fd\u21fe\u21ff\u2200\u2201\u2202\u2203\u2204\u2205\u2206\u2207\u2208\u2209\u220a\u220b\u220c\u220d\u220e\u220f\u2210\u2211\u2212\u2213\u2214\u2215\u2216\u2217\u2218\u2219\u221a\u221b\u221c\u221d\u221e\u221f\u2220\u2221\u2222\u2223\u2224\u2225\u2226\u2227\u2228\u2229\u222a\u222b\u222c\u222d\u222e\u222f\u2230\u2231\u2232\u2233\u2234\u2235\u2236\u2237\u2238\u2239\u223a\u223b\u223c\u223d\u223e\u223f\u2240\u2241\u2242\u2243\u2244\u2245\u2246\u2247\u2248\u2249\u224a\u224b\u224c\u224d\u224e\u224f\u2250\u2251\u2252\u2253\u2254\u2255\u2256\u2257\u2258\u2259\u225a\u225b\u225c\u225d\u225e\u225f\u2260\u2261\u2262\u2263\u2264\u2265\u2266\u2267\u2268\u2269\u226a\u226b\u226c\u226d\u226e\u226f\u2270\u2271\u2272\u2273\u2274\u2275\u2276\u2277\u2278\u2279\u227a\u227b\u227c\u227d\u227e\u227f\u2280\u2281\u2282\u2283\u2284\u2285\u2286\u2287\u2288\u2289\u228a\u228b\u228c\u228d\u228e\u228f\u2290\u2291\u2292\u2293\u2294\u2295\u2296\u2297\u2298\u2299\u229a\u229b\u229c\u229d\u229e\u229f\u22a0\u22a1\u22a2\u22a3\u22a4\u22a5\u22a6\u22a7\u22a8\u22a9\u22aa\u22ab\u22ac\u22ad\u22ae\u22af\u22b0\u22b1\u22b2\u22b3\u22b4\u22b5\u22b6\u22b7\u22b8\u22b9\u22ba\u22bb\u22bc\u22bd\u22be\u22bf\u22c0\u22c1\u22c2\u22c3\u22c4\u22c5\u22c6\u22c7\u22c8\u22c9\u22ca\u22cb\u22cc\u22cd\u22ce\u22cf\u22d0\u22d1\u22d2\u22d3\u22d4\u22d5\u22d6\u22d7\u22d8\u22d9\u22da\u22db\u22dc\u22dd\u22de\u22df\u22e0\u22e1\u22e2\u22e3\u22e4\u22e5\u22e6\u22e7\u22e8\u22e9\u22ea\u22eb\u22ec\u22ed\u22ee\u22ef\u22f0\u22f1\u22f2\u22f3\u22f4\u22f5\u22f6\u22f7\u22f8\u22f9\u22fa\u22fb\u22fc\u22fd\u22fe\u22ff\u2308\u2309\u230a\u230b\u2320\u2321\u237c\u239b\u239c\u239d\u239e\u239f\u23a0\u23a1\u23a2\u23a3\u23a4\u23a5\u23a6\u23a7\u23a8\u23a9\u23aa\u23ab\u23ac\u23ad\u23ae\u23af\u23b0\u23b1\u23b2\u23b3\u25b7\u25c1\u25f8\u25f9\u25fa\u25fb\u25fc\u25fd\u25fe\u25ff\u266f\u27c0\u27c1\u27c2\u27c3\u27c4\u27d0\u27d1\u27d2\u27d3\u27d4\u27d5\u27d6\u27d7\u27d8\u27d9\u27da\u27db\u27dc\u27dd\u27de\u27df\u27e0\u27e1\u27e2\u27e3\u27e4\u27e5\u27f0\u27f1\u27f2\u27f3\u27f4\u27f5\u27f6\u27f7\u27f8\u27f9\u27fa\u27fb\u27fc\u27fd\u27fe\u27ff\u2900\u2901\u2902\u2903\u2904\u2905\u2906\u2907\u2908\u2909\u290a\u290b\u290c\u290d\u290e\u290f\u2910\u2911\u2912\u2913\u2914\u2915\u2916\u2917\u2918\u2919\u291a\u291b\u291c\u291d\u291e\u291f\u2920\u2921\u2922\u2923\u2924\u2925\u2926\u2927\u2928\u2929\u292a\u292b\u292c\u292d\u292e\u292f\u2930\u2931\u2932\u2933\u2934\u2935\u2936\u2937\u2938\u2939\u293a\u293b\u293c\u293d\u293e\u293f\u2940\u2941\u2942\u2943\u2944\u2945\u2946\u2947\u2948\u2949\u294a\u294b\u294c\u294d\u294e\u294f\u2950\u2951\u2952\u2953\u2954\u2955\u2956\u2957\u2958\u2959\u295a\u295b\u295c\u295d\u295e\u295f\u2960\u2961\u2962\u2963\u2964\u2965\u2966\u2967\u2968\u2969\u296a\u296b\u296c\u296d\u296e\u296f\u2970\u2971\u2972\u2973\u2974\u2975\u2976\u2977\u2978\u2979\u297a\u297b\u297c\u297d\u297e\u297f\u2980\u2981\u2982\u2999\u299a\u299b\u299c\u299d\u299e\u299f\u29a0\u29a1\u29a2\u29a3\u29a4\u29a5\u29a6\u29a7\u29a8\u29a9\u29aa\u29ab\u29ac\u29ad\u29ae\u29af\u29b0\u29b1\u29b2\u29b3\u29b4\u29b5\u29b6\u29b7\u29b8\u29b9\u29ba\u29bb\u29bc\u29bd\u29be\u29bf\u29c0\u29c1\u29c2\u29c3\u29c4\u29c5\u29c6\u29c7\u29c8\u29c9\u29ca\u29cb\u29cc\u29cd\u29ce\u29cf\u29d0\u29d1\u29d2\u29d3\u29d4\u29d5\u29d6\u29d7\u29dc\u29dd\u29de\u29df\u29e0\u29e1\u29e2\u29e3\u29e4\u29e5\u29e6\u29e7\u29e8\u29e9\u29ea\u29eb\u29ec\u29ed\u29ee\u29ef\u29f0\u29f1\u29f2\u29f3\u29f4\u29f5\u29f6\u29f7\u29f8\u29f9\u29fa\u29fb\u29fe\u29ff\u2a00\u2a01\u2a02\u2a03\u2a04\u2a05\u2a06\u2a07\u2a08\u2a09\u2a0a\u2a0b\u2a0c\u2a0d\u2a0e\u2a0f\u2a10\u2a11\u2a12\u2a13\u2a14\u2a15\u2a16\u2a17\u2a18\u2a19\u2a1a\u2a1b\u2a1c\u2a1d\u2a1e\u2a1f\u2a20\u2a21\u2a22\u2a23\u2a24\u2a25\u2a26\u2a27\u2a28\u2a29\u2a2a\u2a2b\u2a2c\u2a2d\u2a2e\u2a2f\u2a30\u2a31\u2a32\u2a33\u2a34\u2a35\u2a36\u2a37\u2a38\u2a39\u2a3a\u2a3b\u2a3c\u2a3d\u2a3e\u2a3f\u2a40\u2a41\u2a42\u2a43\u2a44\u2a45\u2a46\u2a47\u2a48\u2a49\u2a4a\u2a4b\u2a4c\u2a4d\u2a4e\u2a4f\u2a50\u2a51\u2a52\u2a53\u2a54\u2a55\u2a56\u2a57\u2a58\u2a59\u2a5a\u2a5b\u2a5c\u2a5d\u2a5e\u2a5f\u2a60\u2a61\u2a62\u2a63\u2a64\u2a65\u2a66\u2a67\u2a68\u2a69\u2a6a\u2a6b\u2a6c\u2a6d\u2a6e\u2a6f\u2a70\u2a71\u2a72\u2a73\u2a74\u2a75\u2a76\u2a77\u2a78\u2a79\u2a7a\u2a7b\u2a7c\u2a7d\u2a7e\u2a7f\u2a80\u2a81\u2a82\u2a83\u2a84\u2a85\u2a86\u2a87\u2a88\u2a89\u2a8a\u2a8b\u2a8c\u2a8d\u2a8e\u2a8f\u2a90\u2a91\u2a92\u2a93\u2a94\u2a95\u2a96\u2a97\u2a98\u2a99\u2a9a\u2a9b\u2a9c\u2a9d\u2a9e\u2a9f\u2aa0\u2aa1\u2aa2\u2aa3\u2aa4\u2aa5\u2aa6\u2aa7\u2aa8\u2aa9\u2aaa\u2aab\u2aac\u2aad\u2aae\u2aaf\u2ab0\u2ab1\u2ab2\u2ab3\u2ab4\u2ab5\u2ab6\u2ab7\u2ab8\u2ab9\u2aba\u2abb\u2abc\u2abd\u2abe\u2abf\u2ac0\u2ac1\u2ac2\u2ac3\u2ac4\u2ac5\u2ac6\u2ac7\u2ac8\u2ac9\u2aca\u2acb\u2acc\u2acd\u2ace\u2acf\u2ad0\u2ad1\u2ad2\u2ad3\u2ad4\u2ad5\u2ad6\u2ad7\u2ad8\u2ad9\u2ada\u2adb\u2adc\u2add\u2ade\u2adf\u2ae0\u2ae1\u2ae2\u2ae3\u2ae4\u2ae5\u2ae6\u2ae7\u2ae8\u2ae9\u2aea\u2aeb\u2aec\u2aed\u2aee\u2aef\u2af0\u2af1\u2af2\u2af3\u2af4\u2af5\u2af6\u2af7\u2af8\u2af9\u2afa\u2afb\u2afc\u2afd\u2afe\u2aff\ufb29\ufe62\ufe64\ufe65\ufe66\uff0b\uff1c\uff1d\uff1e\uff5c\uff5e\uffe2\uffe9\uffea\uffeb\uffec'
-
-So = 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-
-Zl = u'\u2028'
-
-Zp = u'\u2029'
-
-Zs = u' \xa0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
-
-cats = ['Cc', 'Cf', 'Cn', 'Co', 'Cs', 'Ll', 'Lm', 'Lo', 'Lt', 'Lu', 'Mc', 'Me', 'Mn', 'Nd', 'Nl', 'No', 'Pc', 'Pd', 'Pe', 'Pf', 'Pi', 'Po', 'Ps', 'Sc', 'Sk', 'Sm', 'So', 'Zl', 'Zp', 'Zs']
-
-def combine(*args):
-    return u''.join([globals()[cat] for cat in args])
-
-xid_start = u'\u0041-\u005A\u005F\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u01BA\u01BB\u01BC-\u01BF\u01C0-\u01C3\u01C4-\u0241\u0250-\u02AF\u02B0-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EE\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03CE\u03D0-\u03F5\u03F7-\u0481\u048A-\u04CE\u04D0-\u04F9\u0500-\u050F\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0621-\u063A\u0640\u0641-\u064A\u066E-\u066F\u0671-\u06D3\u06D5\u06E5-\u06E6\u06EE-\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u076D\u0780-\u07A5\u07B1\u0904-\u0939\u093D\u0950\u0958-\u0961\u097D\u0985-\u098C\u098F-\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC-\u09DD\u09DF-\u09E1\u09F0-\u09F1\u0A05-\u0A0A\u0A0F-\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32-\u0A33\u0A35-\u0A36\u0A38-\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2-\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0-\u0AE1\u0B05-\u0B0C\u0B0F-\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32-\u0B33\u0B35-\u0B39\u0B3D\u0B5C-\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99-\u0B9A\u0B9C\u0B9E-\u0B9F\u0BA3-\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C60-\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0-\u0CE1\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D28\u0D2A-\u0D39\u0D60-\u0D61\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E40-\u0E45\u0E46\u0E81-\u0E82\u0E84\u0E87-\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA-\u0EAB\u0EAD-\u0EB0\u0EB2\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDD\u0F00\u0F40-\u0F47\u0F49-\u0F6A\u0F88-\u0F8B\u1000-\u1021\u1023-\u1027\u1029-\u102A\u1050-\u1055\u10A0-\u10C5\u10D0-\u10FA\u10FC\u1100-\u1159\u115F-\u11A2\u11A8-\u11F9\u1200-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u1676\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F0\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1842\u1843\u1844-\u1877\u1880-\u18A8\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19A9\u19C1-\u19C7\u1A00-\u1A16\u1D00-\u1D2B\u1D2C-\u1D61\u1D62-\u1D77\u1D78\u1D79-\u1D9A\u1D9B-\u1DBF\u1E00-\u1E9B\u1EA0-\u1EF9\u1F00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u2094\u2102\u2107\u210A-\u2113\u2115\u2118\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212E\u212F-\u2131\u2133-\u2134\u2135-\u2138\u2139\u213C-\u213F\u2145-\u2149\u2160-\u2183\u2C00-\u2C2E\u2C30-\u2C5E\u2C80-\u2CE4\u2D00-\u2D25\u2D30-\u2D65\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u3005\u3006\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303A\u303B\u303C\u3041-\u3096\u309D-\u309E\u309F\u30A1-\u30FA\u30FC-\u30FE\u30FF\u3105-\u312C\u3131-\u318E\u31A0-\u31B7\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FBB\uA000-\uA014\uA015\uA016-\uA48C\uA800-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uAC00-\uD7A3\uF900-\uFA2D\uFA30-\uFA6A\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40-\uFB41\uFB43-\uFB44\uFB46-\uFBB1\uFBD3-\uFC5D\uFC64-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDF9\uFE71\uFE73\uFE77\uFE79\uFE7B\uFE7D\uFE7F-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFF6F\uFF70\uFF71-\uFF9D\uFFA0-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC'
-
-xid_continue = u'\u0030-\u0039\u0041-\u005A\u005F\u0061-\u007A\u00AA\u00B5\u00B7\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u01BA\u01BB\u01BC-\u01BF\u01C0-\u01C3\u01C4-\u0241\u0250-\u02AF\u02B0-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EE\u0300-\u036F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03CE\u03D0-\u03F5\u03F7-\u0481\u0483-\u0486\u048A-\u04CE\u04D0-\u04F9\u0500-\u050F\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05B9\u05BB-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7\u05D0-\u05EA\u05F0-\u05F2\u0610-\u0615\u0621-\u063A\u0640\u0641-\u064A\u064B-\u065E\u0660-\u0669\u066E-\u066F\u0670\u0671-\u06D3\u06D5\u06D6-\u06DC\u06DF-\u06E4\u06E5-\u06E6\u06E7-\u06E8\u06EA-\u06ED\u06EE-\u06EF\u06F0-\u06F9\u06FA-\u06FC\u06FF\u0710\u0711\u0712-\u072F\u0730-\u074A\u074D-\u076D\u0780-\u07A5\u07A6-\u07B0\u07B1\u0901-\u0902\u0903\u0904-\u0939\u093C\u093D\u093E-\u0940\u0941-\u0948\u0949-\u094C\u094D\u0950\u0951-\u0954\u0958-\u0961\u0962-\u0963\u0966-\u096F\u097D\u0981\u0982-\u0983\u0985-\u098C\u098F-\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BC\u09BD\u09BE-\u09C0\u09C1-\u09C4\u09C7-\u09C8\u09CB-\u09CC\u09CD\u09CE\u09D7\u09DC-\u09DD\u09DF-\u09E1\u09E2-\u09E3\u09E6-\u09EF\u09F0-\u09F1\u0A01-\u0A02\u0A03\u0A05-\u0A0A\u0A0F-\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32-\u0A33\u0A35-\u0A36\u0A38-\u0A39\u0A3C\u0A3E-\u0A40\u0A41-\u0A42\u0A47-\u0A48\u0A4B-\u0A4D\u0A59-\u0A5C\u0A5E\u0A66-\u0A6F\u0A70-\u0A71\u0A72-\u0A74\u0A81-\u0A82\u0A83\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2-\u0AB3\u0AB5-\u0AB9\u0ABC\u0ABD\u0ABE-\u0AC0\u0AC1-\u0AC5\u0AC7-\u0AC8\u0AC9\u0ACB-\u0ACC\u0ACD\u0AD0\u0AE0-\u0AE1\u0AE2-\u0AE3\u0AE6-\u0AEF\u0B01\u0B02-\u0B03\u0B05-\u0B0C\u0B0F-\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32-\u0B33\u0B35-\u0B39\u0B3C\u0B3D\u0B3E\u0B3F\u0B40\u0B41-\u0B43\u0B47-\u0B48\u0B4B-\u0B4C\u0B4D\u0B56\u0B57\u0B5C-\u0B5D\u0B5F-\u0B61\u0B66-\u0B6F\u0B71\u0B82\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99-\u0B9A\u0B9C\u0B9E-\u0B9F\u0BA3-\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BBE-\u0BBF\u0BC0\u0BC1-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCC\u0BCD\u0BD7\u0BE6-\u0BEF\u0C01-\u0C03\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3E-\u0C40\u0C41-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55-\u0C56\u0C60-\u0C61\u0C66-\u0C6F\u0C82-\u0C83\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBC\u0CBD\u0CBE\u0CBF\u0CC0-\u0CC4\u0CC6\u0CC7-\u0CC8\u0CCA-\u0CCB\u0CCC-\u0CCD\u0CD5-\u0CD6\u0CDE\u0CE0-\u0CE1\u0CE6-\u0CEF\u0D02-\u0D03\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D28\u0D2A-\u0D39\u0D3E-\u0D40\u0D41-\u0D43\u0D46-\u0D48\u0D4A-\u0D4C\u0D4D\u0D57\u0D60-\u0D61\u0D66-\u0D6F\u0D82-\u0D83\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0DCA\u0DCF-\u0DD1\u0DD2-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DF2-\u0DF3\u0E01-\u0E30\u0E31\u0E32-\u0E33\u0E34-\u0E3A\u0E40-\u0E45\u0E46\u0E47-\u0E4E\u0E50-\u0E59\u0E81-\u0E82\u0E84\u0E87-\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA-\u0EAB\u0EAD-\u0EB0\u0EB1\u0EB2-\u0EB3\u0EB4-\u0EB9\u0EBB-\u0EBC\u0EBD\u0EC0-\u0EC4\u0EC6\u0EC8-\u0ECD\u0ED0-\u0ED9\u0EDC-\u0EDD\u0F00\u0F18-\u0F19\u0F20-\u0F29\u0F35\u0F37\u0F39\u0F3E-\u0F3F\u0F40-\u0F47\u0F49-\u0F6A\u0F71-\u0F7E\u0F7F\u0F80-\u0F84\u0F86-\u0F87\u0F88-\u0F8B\u0F90-\u0F97\u0F99-\u0FBC\u0FC6\u1000-\u1021\u1023-\u1027\u1029-\u102A\u102C\u102D-\u1030\u1031\u1032\u1036-\u1037\u1038\u1039\u1040-\u1049\u1050-\u1055\u1056-\u1057\u1058-\u1059\u10A0-\u10C5\u10D0-\u10FA\u10FC\u1100-\u1159\u115F-\u11A2\u11A8-\u11F9\u1200-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u135F\u1369-\u1371\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u1676\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F0\u1700-\u170C\u170E-\u1711\u1712-\u1714\u1720-\u1731\u1732-\u1734\u1740-\u1751\u1752-\u1753\u1760-\u176C\u176E-\u1770\u1772-\u1773\u1780-\u17B3\u17B6\u17B7-\u17BD\u17BE-\u17C5\u17C6\u17C7-\u17C8\u17C9-\u17D3\u17D7\u17DC\u17DD\u17E0-\u17E9\u180B-\u180D\u1810-\u1819\u1820-\u1842\u1843\u1844-\u1877\u1880-\u18A8\u18A9\u1900-\u191C\u1920-\u1922\u1923-\u1926\u1927-\u1928\u1929-\u192B\u1930-\u1931\u1932\u1933-\u1938\u1939-\u193B\u1946-\u194F\u1950-\u196D\u1970-\u1974\u1980-\u19A9\u19B0-\u19C0\u19C1-\u19C7\u19C8-\u19C9\u19D0-\u19D9\u1A00-\u1A16\u1A17-\u1A18\u1A19-\u1A1B\u1D00-\u1D2B\u1D2C-\u1D61\u1D62-\u1D77\u1D78\u1D79-\u1D9A\u1D9B-\u1DBF\u1DC0-\u1DC3\u1E00-\u1E9B\u1EA0-\u1EF9\u1F00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u203F-\u2040\u2054\u2071\u207F\u2090-\u2094\u20D0-\u20DC\u20E1\u20E5-\u20EB\u2102\u2107\u210A-\u2113\u2115\u2118\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212E\u212F-\u2131\u2133-\u2134\u2135-\u2138\u2139\u213C-\u213F\u2145-\u2149\u2160-\u2183\u2C00-\u2C2E\u2C30-\u2C5E\u2C80-\u2CE4\u2D00-\u2D25\u2D30-\u2D65\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u3005\u3006\u3007\u3021-\u3029\u302A-\u302F\u3031-\u3035\u3038-\u303A\u303B\u303C\u3041-\u3096\u3099-\u309A\u309D-\u309E\u309F\u30A1-\u30FA\u30FC-\u30FE\u30FF\u3105-\u312C\u3131-\u318E\u31A0-\u31B7\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FBB\uA000-\uA014\uA015\uA016-\uA48C\uA800-\uA801\uA802\uA803-\uA805\uA806\uA807-\uA80A\uA80B\uA80C-\uA822\uA823-\uA824\uA825-\uA826\uA827\uAC00-\uD7A3\uF900-\uFA2D\uFA30-\uFA6A\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1E\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40-\uFB41\uFB43-\uFB44\uFB46-\uFBB1\uFBD3-\uFC5D\uFC64-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDF9\uFE00-\uFE0F\uFE20-\uFE23\uFE33-\uFE34\uFE4D-\uFE4F\uFE71\uFE73\uFE77\uFE79\uFE7B\uFE7D\uFE7F-\uFEFC\uFF10-\uFF19\uFF21-\uFF3A\uFF3F\uFF41-\uFF5A\uFF66-\uFF6F\uFF70\uFF71-\uFF9D\uFF9E-\uFF9F\uFFA0-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC'
-
-def allexcept(*args):
-    newcats = cats[:]
-    for arg in args:
-        newcats.remove(arg)
-    return u''.join([globals()[cat] for cat in newcats])
-
-if __name__ == '__main__':
-    import unicodedata
-
-    categories = {}
-
-    f = open(__file__.rstrip('co'))
-    try:
-        content = f.read()
-    finally:
-        f.close()
-
-    header = content[:content.find('Cc =')]
-    footer = content[content.find("def combine("):]
-
-    for code in range(65535):
-        c = unichr(code)
-        cat = unicodedata.category(c)
-        categories.setdefault(cat, []).append(c)
-
-    f = open(__file__, 'w')
-    f.write(header)
-
-    for cat in sorted(categories):
-        val = u''.join(categories[cat])
-        if cat == 'Cs':
-            # Jython can't handle isolated surrogates
-            f.write("""\
-try:
-    Cs = eval(r"%r")
-except UnicodeDecodeError:
-    Cs = '' # Jython can't handle isolated surrogates\n\n""" % val)
-        else:
-            f.write('%s = %r\n\n' % (cat, val))
-    f.write('cats = %r\n\n' % sorted(categories.keys()))
-
-    f.write(footer)
-    f.close()

async_utils.py

diff --git a/async_utils.py b/async_utils.py
new file mode 100644
index 0000000..1a4f389
--- /dev/null
+++ b/async_utils.py
@@ -0,0 +1,84 @@
+import inspect
+import typing as t
+from functools import WRAPPER_ASSIGNMENTS
+from functools import wraps
+
+from .utils import _PassArg
+from .utils import pass_eval_context
+
+V = t.TypeVar("V")
+
+
+def async_variant(normal_func):  # type: ignore
+    def decorator(async_func):  # type: ignore
+        pass_arg = _PassArg.from_obj(normal_func)
+        need_eval_context = pass_arg is None
+
+        if pass_arg is _PassArg.environment:
+
+            def is_async(args: t.Any) -> bool:
+                return t.cast(bool, args[0].is_async)
+
+        else:
+
+            def is_async(args: t.Any) -> bool:
+                return t.cast(bool, args[0].environment.is_async)
+
+        # Take the doc and annotations from the sync function, but the
+        # name from the async function. Pallets-Sphinx-Themes
+        # build_function_directive expects __wrapped__ to point to the
+        # sync function.
+        async_func_attrs = ("__module__", "__name__", "__qualname__")
+        normal_func_attrs = tuple(set(WRAPPER_ASSIGNMENTS).difference(async_func_attrs))
+
+        @wraps(normal_func, assigned=normal_func_attrs)
+        @wraps(async_func, assigned=async_func_attrs, updated=())
+        def wrapper(*args, **kwargs):  # type: ignore
+            b = is_async(args)
+
+            if need_eval_context:
+                args = args[1:]
+
+            if b:
+                return async_func(*args, **kwargs)
+
+            return normal_func(*args, **kwargs)
+
+        if need_eval_context:
+            wrapper = pass_eval_context(wrapper)
+
+        wrapper.jinja_async_variant = True
+        return wrapper
+
+    return decorator
+
+
+_common_primitives = {int, float, bool, str, list, dict, tuple, type(None)}
+
+
+async def auto_await(value: t.Union[t.Awaitable["V"], "V"]) -> "V":
+    # Avoid a costly call to isawaitable
+    if type(value) in _common_primitives:
+        return t.cast("V", value)
+
+    if inspect.isawaitable(value):
+        return await t.cast("t.Awaitable[V]", value)
+
+    return t.cast("V", value)
+
+
+async def auto_aiter(
+    iterable: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+) -> "t.AsyncIterator[V]":
+    if hasattr(iterable, "__aiter__"):
+        async for item in t.cast("t.AsyncIterable[V]", iterable):
+            yield item
+    else:
+        for item in t.cast("t.Iterable[V]", iterable):
+            yield item
+
+
+async def auto_to_list(
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+) -> t.List["V"]:
+    return [x async for x in auto_aiter(value)]

bccache.py

diff --git a/bccache.py b/bccache.py
index f2f9db6..d0ddf56 100644
--- a/bccache.py
+++ b/bccache.py
@@ -1,60 +1,47 @@
-# -*- coding: utf-8 -*-
+"""The optional bytecode cache system. This is useful if you have very
+complex template situations and the compilation of all those templates
+slows down your application too much.
+
+Situations where this is useful are often forking web applications that
+are initialized on the first request.
 """
-    jinja2.bccache
-    ~~~~~~~~~~~~~~
-
-    This module implements the bytecode cache system Jinja is optionally
-    using.  This is useful if you have very complex template situations and
-    the compiliation of all those templates slow down your application too
-    much.
-
-    Situations where this is useful are often forking web applications that
-    are initialized on the first request.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD.
-"""
-from os import path, listdir
-import sys
-import marshal
-import tempfile
+import errno
 import fnmatch
+import marshal
+import os
+import pickle
+import stat
+import sys
+import tempfile
+import typing as t
 from hashlib import sha1
-from jinja2.utils import open_if_exists
-from jinja2._compat import BytesIO, pickle, PY2, text_type
+from io import BytesIO
+from types import CodeType
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .environment import Environment
+
+    class _MemcachedClient(te.Protocol):
+        def get(self, key: str) -> bytes:
+            ...
+
+        def set(self, key: str, value: bytes, timeout: t.Optional[int] = None) -> None:
+            ...
 
 
-# marshal works better on 3.x, one hack less required
-if not PY2:
-    marshal_dump = marshal.dump
-    marshal_load = marshal.load
-else:
-
-    def marshal_dump(code, f):
-        if isinstance(f, file):
-            marshal.dump(code, f)
-        else:
-            f.write(marshal.dumps(code))
-
-    def marshal_load(f):
-        if isinstance(f, file):
-            return marshal.load(f)
-        return marshal.loads(f.read())
+bc_version = 5
+# Magic bytes to identify Jinja bytecode cache files. Contains the
+# Python major and minor version to avoid loading incompatible bytecode
+# if a project upgrades its Python version.
+bc_magic = (
+    b"j2"
+    + pickle.dumps(bc_version, 2)
+    + pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1], 2)
+)
 
 
-bc_version = 2
-
-# magic version used to only change with new jinja versions.  With 2.6
-# we change this to also take Python version changes into account.  The
-# reason for this is that Python tends to segfault if fed earlier bytecode
-# versions because someone thought it would be a good idea to reuse opcodes
-# or make Python incompatible with earlier versions.
-bc_magic = 'j2'.encode('ascii') + \
-    pickle.dumps(bc_version, 2) + \
-    pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1])
-
-
-class Bucket(object):
+class Bucket:
     """Buckets are used to store the bytecode for one template.  It's created
     and initialized by the bytecode cache and passed to the loading functions.
 
@@ -63,17 +50,17 @@
     cache subclasses don't have to care about cache invalidation.
     """
 
-    def __init__(self, environment, key, checksum):
+    def __init__(self, environment: "Environment", key: str, checksum: str) -> None:
         self.environment = environment
         self.key = key
         self.checksum = checksum
         self.reset()
 
-    def reset(self):
+    def reset(self) -> None:
         """Resets the bucket (unloads the bytecode)."""
-        self.code = None
+        self.code: t.Optional[CodeType] = None
 
-    def load_bytecode(self, f):
+    def load_bytecode(self, f: t.BinaryIO) -> None:
         """Loads bytecode from a file or file like object."""
         # make sure the magic header is correct
         magic = f.read(len(bc_magic))
@@ -85,28 +72,33 @@
         if self.checksum != checksum:
             self.reset()
             return
-        self.code = marshal_load(f)
+        # if marshal_load fails then we need to reload
+        try:
+            self.code = marshal.load(f)
+        except (EOFError, ValueError, TypeError):
+            self.reset()
+            return
 
-    def write_bytecode(self, f):
+    def write_bytecode(self, f: t.IO[bytes]) -> None:
         """Dump the bytecode into the file or file like object passed."""
         if self.code is None:
-            raise TypeError('can\'t write empty bucket')
+            raise TypeError("can't write empty bucket")
         f.write(bc_magic)
         pickle.dump(self.checksum, f, 2)
-        marshal_dump(self.code, f)
+        marshal.dump(self.code, f)
 
-    def bytecode_from_string(self, string):
-        """Load bytecode from a string."""
+    def bytecode_from_string(self, string: bytes) -> None:
+        """Load bytecode from bytes."""
         self.load_bytecode(BytesIO(string))
 
-    def bytecode_to_string(self):
-        """Return the bytecode as string."""
+    def bytecode_to_string(self) -> bytes:
+        """Return the bytecode as bytes."""
         out = BytesIO()
         self.write_bytecode(out)
         return out.getvalue()
 
 
-class BytecodeCache(object):
+class BytecodeCache:
     """To implement your own bytecode cache you have to subclass this class
     and override :meth:`load_bytecode` and :meth:`dump_bytecode`.  Both of
     these methods are passed a :class:`~jinja2.bccache.Bucket`.
@@ -132,44 +124,51 @@
                     bucket.write_bytecode(f)
 
     A more advanced version of a filesystem based bytecode cache is part of
-    Jinja2.
+    Jinja.
     """
 
-    def load_bytecode(self, bucket):
+    def load_bytecode(self, bucket: Bucket) -> None:
         """Subclasses have to override this method to load bytecode into a
         bucket.  If they are not able to find code in the cache for the
         bucket, it must not do anything.
         """
         raise NotImplementedError()
 
-    def dump_bytecode(self, bucket):
+    def dump_bytecode(self, bucket: Bucket) -> None:
         """Subclasses have to override this method to write the bytecode
         from a bucket back to the cache.  If it unable to do so it must not
         fail silently but raise an exception.
         """
         raise NotImplementedError()
 
-    def clear(self):
-        """Clears the cache.  This method is not used by Jinja2 but should be
+    def clear(self) -> None:
+        """Clears the cache.  This method is not used by Jinja but should be
         implemented to allow applications to clear the bytecode cache used
         by a particular environment.
         """
 
-    def get_cache_key(self, name, filename=None):
+    def get_cache_key(
+        self, name: str, filename: t.Optional[t.Union[str]] = None
+    ) -> str:
         """Returns the unique hash key for this template name."""
-        hash = sha1(name.encode('utf-8'))
+        hash = sha1(name.encode("utf-8"))
+
         if filename is not None:
-            filename = '|' + filename
-            if isinstance(filename, text_type):
-                filename = filename.encode('utf-8')
-            hash.update(filename)
+            hash.update(f"|{filename}".encode())
+
         return hash.hexdigest()
 
-    def get_source_checksum(self, source):
+    def get_source_checksum(self, source: str) -> str:
         """Returns a checksum for the source."""
-        return sha1(source.encode('utf-8')).hexdigest()
+        return sha1(source.encode("utf-8")).hexdigest()
 
-    def get_bucket(self, environment, name, filename, source):
+    def get_bucket(
+        self,
+        environment: "Environment",
+        name: str,
+        filename: t.Optional[str],
+        source: str,
+    ) -> Bucket:
         """Return a cache bucket for the given template.  All arguments are
         mandatory but filename may be `None`.
         """
@@ -179,7 +178,7 @@
         self.load_bytecode(bucket)
         return bucket
 
-    def set_bucket(self, bucket):
+    def set_bucket(self, bucket: Bucket) -> None:
         """Put the bucket into the cache."""
         self.dump_bytecode(bucket)
 
@@ -189,7 +188,9 @@
     two arguments: The directory where the cache items are stored and a
     pattern string that is used to build the filename.
 
-    If no directory is specified the system temporary items folder is used.
+    If no directory is specified a default cache directory is selected.  On
+    Windows the user's temp directory is used, on UNIX systems a directory
+    is created for the user in the system temp directory.
 
     The pattern can be used to have multiple separate caches operate on the
     same directory.  The default pattern is ``'__jinja2_%s.cache'``.  ``%s``
@@ -200,39 +201,127 @@
     This bytecode cache supports clearing of the cache using the clear method.
     """
 
-    def __init__(self, directory=None, pattern='__jinja2_%s.cache'):
+    def __init__(
+        self, directory: t.Optional[str] = None, pattern: str = "__jinja2_%s.cache"
+    ) -> None:
         if directory is None:
-            directory = tempfile.gettempdir()
+            directory = self._get_default_cache_dir()
         self.directory = directory
         self.pattern = pattern
 
-    def _get_cache_filename(self, bucket):
-        return path.join(self.directory, self.pattern % bucket.key)
+    def _get_default_cache_dir(self) -> str:
+        def _unsafe_dir() -> "te.NoReturn":
+            raise RuntimeError(
+                "Cannot determine safe temp directory.  You "
+                "need to explicitly provide one."
+            )
 
-    def load_bytecode(self, bucket):
-        f = open_if_exists(self._get_cache_filename(bucket), 'rb')
-        if f is not None:
-            try:
-                bucket.load_bytecode(f)
-            finally:
-                f.close()
+        tmpdir = tempfile.gettempdir()
 
-    def dump_bytecode(self, bucket):
-        f = open(self._get_cache_filename(bucket), 'wb')
+        # On windows the temporary directory is used specific unless
+        # explicitly forced otherwise.  We can just use that.
+        if os.name == "nt":
+            return tmpdir
+        if not hasattr(os, "getuid"):
+            _unsafe_dir()
+
+        dirname = f"_jinja2-cache-{os.getuid()}"
+        actual_dir = os.path.join(tmpdir, dirname)
+
         try:
-            bucket.write_bytecode(f)
-        finally:
-            f.close()
+            os.mkdir(actual_dir, stat.S_IRWXU)
+        except OSError as e:
+            if e.errno != errno.EEXIST:
+                raise
+        try:
+            os.chmod(actual_dir, stat.S_IRWXU)
+            actual_dir_stat = os.lstat(actual_dir)
+            if (
+                actual_dir_stat.st_uid != os.getuid()
+                or not stat.S_ISDIR(actual_dir_stat.st_mode)
+                or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
+            ):
+                _unsafe_dir()
+        except OSError as e:
+            if e.errno != errno.EEXIST:
+                raise
 
-    def clear(self):
+        actual_dir_stat = os.lstat(actual_dir)
+        if (
+            actual_dir_stat.st_uid != os.getuid()
+            or not stat.S_ISDIR(actual_dir_stat.st_mode)
+            or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
+        ):
+            _unsafe_dir()
+
+        return actual_dir
+
+    def _get_cache_filename(self, bucket: Bucket) -> str:
+        return os.path.join(self.directory, self.pattern % (bucket.key,))
+
+    def load_bytecode(self, bucket: Bucket) -> None:
+        filename = self._get_cache_filename(bucket)
+
+        # Don't test for existence before opening the file, since the
+        # file could disappear after the test before the open.
+        try:
+            f = open(filename, "rb")
+        except (FileNotFoundError, IsADirectoryError, PermissionError):
+            # PermissionError can occur on Windows when an operation is
+            # in progress, such as calling clear().
+            return
+
+        with f:
+            bucket.load_bytecode(f)
+
+    def dump_bytecode(self, bucket: Bucket) -> None:
+        # Write to a temporary file, then rename to the real name after
+        # writing. This avoids another process reading the file before
+        # it is fully written.
+        name = self._get_cache_filename(bucket)
+        f = tempfile.NamedTemporaryFile(
+            mode="wb",
+            dir=os.path.dirname(name),
+            prefix=os.path.basename(name),
+            suffix=".tmp",
+            delete=False,
+        )
+
+        def remove_silent() -> None:
+            try:
+                os.remove(f.name)
+            except OSError:
+                # Another process may have called clear(). On Windows,
+                # another program may be holding the file open.
+                pass
+
+        try:
+            with f:
+                bucket.write_bytecode(f)
+        except BaseException:
+            remove_silent()
+            raise
+
+        try:
+            os.replace(f.name, name)
+        except OSError:
+            # Another process may have called clear(). On Windows,
+            # another program may be holding the file open.
+            remove_silent()
+        except BaseException:
+            remove_silent()
+            raise
+
+    def clear(self) -> None:
         # imported lazily here because google app-engine doesn't support
         # write access on the file system and the function does not exist
         # normally.
         from os import remove
-        files = fnmatch.filter(listdir(self.directory), self.pattern % '*')
+
+        files = fnmatch.filter(os.listdir(self.directory), self.pattern % ("*",))
         for filename in files:
             try:
-                remove(path.join(self.directory, filename))
+                remove(os.path.join(self.directory, filename))
             except OSError:
                 pass
 
@@ -245,12 +334,11 @@
 
     Libraries compatible with this class:
 
-    -   `werkzeug <http://werkzeug.pocoo.org/>`_.contrib.cache
-    -   `python-memcached <http://www.tummy.com/Community/software/python-memcached/>`_
-    -   `cmemcache <http://gijsbert.org/cmemcache/>`_
+    -   `cachelib <https://github.com/pallets/cachelib>`_
+    -   `python-memcached <https://pypi.org/project/python-memcached/>`_
 
     (Unfortunately the django cache interface is not compatible because it
-    does not support storing binary data, only unicode.  You can however pass
+    does not support storing binary data, only text. You can however pass
     the underlying cache client to the bytecode cache which is available
     as `django.core.cache.cache._client`.)
 
@@ -283,29 +371,36 @@
        `ignore_memcache_errors` parameter.
     """
 
-    def __init__(self, client, prefix='jinja2/bytecode/', timeout=None,
-                 ignore_memcache_errors=True):
+    def __init__(
+        self,
+        client: "_MemcachedClient",
+        prefix: str = "jinja2/bytecode/",
+        timeout: t.Optional[int] = None,
+        ignore_memcache_errors: bool = True,
+    ):
         self.client = client
         self.prefix = prefix
         self.timeout = timeout
         self.ignore_memcache_errors = ignore_memcache_errors
 
-    def load_bytecode(self, bucket):
+    def load_bytecode(self, bucket: Bucket) -> None:
         try:
             code = self.client.get(self.prefix + bucket.key)
         except Exception:
             if not self.ignore_memcache_errors:
                 raise
-            code = None
-        if code is not None:
+        else:
             bucket.bytecode_from_string(code)
 
-    def dump_bytecode(self, bucket):
-        args = (self.prefix + bucket.key, bucket.bytecode_to_string())
-        if self.timeout is not None:
-            args += (self.timeout,)
+    def dump_bytecode(self, bucket: Bucket) -> None:
+        key = self.prefix + bucket.key
+        value = bucket.bytecode_to_string()
+
         try:
-            self.client.set(*args)
+            if self.timeout is not None:
+                self.client.set(key, value, self.timeout)
+            else:
+                self.client.set(key, value)
         except Exception:
             if not self.ignore_memcache_errors:
                 raise

compiler.py

diff --git a/compiler.py b/compiler.py
index 75a60b8..3458095 100644
--- a/compiler.py
+++ b/compiler.py
@@ -1,91 +1,147 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.compiler
-    ~~~~~~~~~~~~~~~
-
-    Compiles nodes into python code.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
+"""Compiles nodes from the parser into Python code."""
+import typing as t
+from contextlib import contextmanager
+from functools import update_wrapper
+from io import StringIO
 from itertools import chain
-from copy import deepcopy
 from keyword import iskeyword as is_python_keyword
-from jinja2 import nodes
-from jinja2.nodes import EvalContext
-from jinja2.visitor import NodeVisitor
-from jinja2.exceptions import TemplateAssertionError
-from jinja2.utils import Markup, concat, escape
-from jinja2._compat import range_type, next, text_type, string_types, \
-     iteritems, NativeStringIO, imap
 
+from markupsafe import escape
+from markupsafe import Markup
+
+from . import nodes
+from .exceptions import TemplateAssertionError
+from .idtracking import Symbols
+from .idtracking import VAR_LOAD_ALIAS
+from .idtracking import VAR_LOAD_PARAMETER
+from .idtracking import VAR_LOAD_RESOLVE
+from .idtracking import VAR_LOAD_UNDEFINED
+from .nodes import EvalContext
+from .optimizer import Optimizer
+from .utils import _PassArg
+from .utils import concat
+from .visitor import NodeVisitor
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .environment import Environment
+
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
 
 operators = {
-    'eq':       '==',
-    'ne':       '!=',
-    'gt':       '>',
-    'gteq':     '>=',
-    'lt':       '<',
-    'lteq':     '<=',
-    'in':       'in',
-    'notin':    'not in'
+    "eq": "==",
+    "ne": "!=",
+    "gt": ">",
+    "gteq": ">=",
+    "lt": "<",
+    "lteq": "<=",
+    "in": "in",
+    "notin": "not in",
 }
 
-# what method to iterate over items do we want to use for dict iteration
-# in generated code?  on 2.x let's go with iteritems, on 3.x with items
-if hasattr(dict, 'iteritems'):
-    dict_item_iter = 'iteritems'
-else:
-    dict_item_iter = 'items'
+
+def optimizeconst(f: F) -> F:
+    def new_func(
+        self: "CodeGenerator", node: nodes.Expr, frame: "Frame", **kwargs: t.Any
+    ) -> t.Any:
+        # Only optimize if the frame is not volatile
+        if self.optimizer is not None and not frame.eval_ctx.volatile:
+            new_node = self.optimizer.visit(node, frame.eval_ctx)
+
+            if new_node != node:
+                return self.visit(new_node, frame)
+
+        return f(self, node, frame, **kwargs)
+
+    return update_wrapper(t.cast(F, new_func), f)
 
 
-# does if 0: dummy(x) get us x into the scope?
-def unoptimize_before_dead_code():
-    x = 42
-    def f():
-        if 0: dummy(x)
-    return f
+def _make_binop(op: str) -> t.Callable[["CodeGenerator", nodes.BinExpr, "Frame"], None]:
+    @optimizeconst
+    def visitor(self: "CodeGenerator", node: nodes.BinExpr, frame: Frame) -> None:
+        if (
+            self.environment.sandboxed
+            and op in self.environment.intercepted_binops  # type: ignore
+        ):
+            self.write(f"environment.call_binop(context, {op!r}, ")
+            self.visit(node.left, frame)
+            self.write(", ")
+            self.visit(node.right, frame)
+        else:
+            self.write("(")
+            self.visit(node.left, frame)
+            self.write(f" {op} ")
+            self.visit(node.right, frame)
 
-# The getattr is necessary for pypy which does not set this attribute if
-# no closure is on the function
-unoptimize_before_dead_code = bool(
-    getattr(unoptimize_before_dead_code(), '__closure__', None))
+        self.write(")")
+
+    return visitor
 
 
-def generate(node, environment, name, filename, stream=None,
-             defer_init=False):
+def _make_unop(
+    op: str,
+) -> t.Callable[["CodeGenerator", nodes.UnaryExpr, "Frame"], None]:
+    @optimizeconst
+    def visitor(self: "CodeGenerator", node: nodes.UnaryExpr, frame: Frame) -> None:
+        if (
+            self.environment.sandboxed
+            and op in self.environment.intercepted_unops  # type: ignore
+        ):
+            self.write(f"environment.call_unop(context, {op!r}, ")
+            self.visit(node.node, frame)
+        else:
+            self.write("(" + op)
+            self.visit(node.node, frame)
+
+        self.write(")")
+
+    return visitor
+
+
+def generate(
+    node: nodes.Template,
+    environment: "Environment",
+    name: t.Optional[str],
+    filename: t.Optional[str],
+    stream: t.Optional[t.TextIO] = None,
+    defer_init: bool = False,
+    optimized: bool = True,
+) -> t.Optional[str]:
     """Generate the python source for a node tree."""
     if not isinstance(node, nodes.Template):
-        raise TypeError('Can\'t compile non template nodes')
-    generator = CodeGenerator(environment, name, filename, stream, defer_init)
+        raise TypeError("Can't compile non template nodes")
+
+    generator = environment.code_generator_class(
+        environment, name, filename, stream, defer_init, optimized
+    )
     generator.visit(node)
+
     if stream is None:
-        return generator.stream.getvalue()
+        return generator.stream.getvalue()  # type: ignore
+
+    return None
 
 
-def has_safe_repr(value):
+def has_safe_repr(value: t.Any) -> bool:
     """Does the node have a safe representation?"""
     if value is None or value is NotImplemented or value is Ellipsis:
         return True
-    if isinstance(value, (bool, int, float, complex, range_type,
-            Markup) + string_types):
+
+    if type(value) in {bool, int, float, complex, range, str, Markup}:
         return True
-    if isinstance(value, (tuple, list, set, frozenset)):
-        for item in value:
-            if not has_safe_repr(item):
-                return False
-        return True
-    elif isinstance(value, dict):
-        for key, value in iteritems(value):
-            if not has_safe_repr(key):
-                return False
-            if not has_safe_repr(value):
-                return False
-        return True
+
+    if type(value) in {tuple, list, set, frozenset}:
+        return all(has_safe_repr(v) for v in value)
+
+    if type(value) is dict:
+        return all(has_safe_repr(k) and has_safe_repr(v) for k, v in value.items())
+
     return False
 
 
-def find_undeclared(nodes, names):
+def find_undeclared(
+    nodes: t.Iterable[nodes.Node], names: t.Iterable[str]
+) -> t.Set[str]:
     """Check if the names passed are accessed undeclared.  The return value
     is a set of all the undeclared names from the sequence of names found.
     """
@@ -98,49 +154,49 @@
     return visitor.undeclared
 
 
-class Identifiers(object):
-    """Tracks the status of identifiers in frames."""
-
-    def __init__(self):
-        # variables that are known to be declared (probably from outer
-        # frames or because they are special for the frame)
-        self.declared = set()
-
-        # undeclared variables from outer scopes
-        self.outer_undeclared = set()
-
-        # names that are accessed without being explicitly declared by
-        # this one or any of the outer scopes.  Names can appear both in
-        # declared and undeclared.
-        self.undeclared = set()
-
-        # names that are declared locally
-        self.declared_locally = set()
-
-        # names that are declared by parameters
-        self.declared_parameter = set()
-
-    def add_special(self, name):
-        """Register a special name like `loop`."""
-        self.undeclared.discard(name)
-        self.declared.add(name)
-
-    def is_declared(self, name):
-        """Check if a name is declared in this or an outer scope."""
-        if name in self.declared_locally or name in self.declared_parameter:
-            return True
-        return name in self.declared
-
-    def copy(self):
-        return deepcopy(self)
+class MacroRef:
+    def __init__(self, node: t.Union[nodes.Macro, nodes.CallBlock]) -> None:
+        self.node = node
+        self.accesses_caller = False
+        self.accesses_kwargs = False
+        self.accesses_varargs = False
 
 
-class Frame(object):
+class Frame:
     """Holds compile time information for us."""
 
-    def __init__(self, eval_ctx, parent=None):
+    def __init__(
+        self,
+        eval_ctx: EvalContext,
+        parent: t.Optional["Frame"] = None,
+        level: t.Optional[int] = None,
+    ) -> None:
         self.eval_ctx = eval_ctx
-        self.identifiers = Identifiers()
+
+        # the parent of this frame
+        self.parent = parent
+
+        if parent is None:
+            self.symbols = Symbols(level=level)
+
+            # in some dynamic inheritance situations the compiler needs to add
+            # write tests around output statements.
+            self.require_output_check = False
+
+            # inside some tags we are using a buffer rather than yield statements.
+            # this for example affects {% filter %} or {% macro %}.  If a frame
+            # is buffered this variable points to the name of the list used as
+            # buffer.
+            self.buffer: t.Optional[str] = None
+
+            # the name of the block we're in, otherwise None.
+            self.block: t.Optional[str] = None
+
+        else:
+            self.symbols = Symbols(parent.symbols, level=level)
+            self.require_output_check = parent.require_output_check
+            self.buffer = parent.buffer
+            self.block = parent.block
 
         # a toplevel frame is the root + soft frames such as if conditions.
         self.toplevel = False
@@ -150,74 +206,40 @@
         # situations.
         self.rootlevel = False
 
-        # in some dynamic inheritance situations the compiler needs to add
-        # write tests around output statements.
-        self.require_output_check = parent and parent.require_output_check
+        # variables set inside of loops and blocks should not affect outer frames,
+        # but they still needs to be kept track of as part of the active context.
+        self.loop_frame = False
+        self.block_frame = False
 
-        # inside some tags we are using a buffer rather than yield statements.
-        # this for example affects {% filter %} or {% macro %}.  If a frame
-        # is buffered this variable points to the name of the list used as
-        # buffer.
-        self.buffer = None
+        # track whether the frame is being used in an if-statement or conditional
+        # expression as it determines which errors should be raised during runtime
+        # or compile time.
+        self.soft_frame = False
 
-        # the name of the block we're in, otherwise None.
-        self.block = parent and parent.block or None
-
-        # a set of actually assigned names
-        self.assigned_names = set()
-
-        # the parent of this frame
-        self.parent = parent
-
-        if parent is not None:
-            self.identifiers.declared.update(
-                parent.identifiers.declared |
-                parent.identifiers.declared_parameter |
-                parent.assigned_names
-            )
-            self.identifiers.outer_undeclared.update(
-                parent.identifiers.undeclared -
-                self.identifiers.declared
-            )
-            self.buffer = parent.buffer
-
-    def copy(self):
+    def copy(self) -> "Frame":
         """Create a copy of the current one."""
         rv = object.__new__(self.__class__)
         rv.__dict__.update(self.__dict__)
-        rv.identifiers = object.__new__(self.identifiers.__class__)
-        rv.identifiers.__dict__.update(self.identifiers.__dict__)
+        rv.symbols = self.symbols.copy()
         return rv
 
-    def inspect(self, nodes):
-        """Walk the node and check for identifiers.  If the scope is hard (eg:
-        enforce on a python level) overrides from outer scopes are tracked
-        differently.
-        """
-        visitor = FrameIdentifierVisitor(self.identifiers)
-        for node in nodes:
-            visitor.visit(node)
-
-    def find_shadowed(self, extra=()):
-        """Find all the shadowed names.  extra is an iterable of variables
-        that may be defined with `add_special` which may occour scoped.
-        """
-        i = self.identifiers
-        return (i.declared | i.outer_undeclared) & \
-               (i.declared_locally | i.declared_parameter) | \
-               set(x for x in extra if i.is_declared(x))
-
-    def inner(self):
+    def inner(self, isolated: bool = False) -> "Frame":
         """Return an inner frame."""
+        if isolated:
+            return Frame(self.eval_ctx, level=self.symbols.level + 1)
         return Frame(self.eval_ctx, self)
 
-    def soft(self):
+    def soft(self) -> "Frame":
         """Return a soft frame.  A soft frame may not be modified as
         standalone thing as it shares the resources with the frame it
         was created of, but it's not a rootlevel frame any longer.
+
+        This is only used to implement if-statements and conditional
+        expressions.
         """
         rv = self.copy()
         rv.rootlevel = False
+        rv.soft_frame = True
         return rv
 
     __copy__ = copy
@@ -230,19 +252,19 @@
 class DependencyFinderVisitor(NodeVisitor):
     """A visitor that collects filter and test calls."""
 
-    def __init__(self):
-        self.filters = set()
-        self.tests = set()
+    def __init__(self) -> None:
+        self.filters: t.Set[str] = set()
+        self.tests: t.Set[str] = set()
 
-    def visit_Filter(self, node):
+    def visit_Filter(self, node: nodes.Filter) -> None:
         self.generic_visit(node)
         self.filters.add(node.name)
 
-    def visit_Test(self, node):
+    def visit_Test(self, node: nodes.Test) -> None:
         self.generic_visit(node)
         self.tests.add(node.name)
 
-    def visit_Block(self, node):
+    def visit_Block(self, node: nodes.Block) -> None:
         """Stop visiting at blocks."""
 
 
@@ -252,108 +274,22 @@
     not stop at closure frames.
     """
 
-    def __init__(self, names):
+    def __init__(self, names: t.Iterable[str]) -> None:
         self.names = set(names)
-        self.undeclared = set()
+        self.undeclared: t.Set[str] = set()
 
-    def visit_Name(self, node):
-        if node.ctx == 'load' and node.name in self.names:
+    def visit_Name(self, node: nodes.Name) -> None:
+        if node.ctx == "load" and node.name in self.names:
             self.undeclared.add(node.name)
             if self.undeclared == self.names:
                 raise VisitorExit()
         else:
             self.names.discard(node.name)
 
-    def visit_Block(self, node):
+    def visit_Block(self, node: nodes.Block) -> None:
         """Stop visiting a blocks."""
 
 
-class FrameIdentifierVisitor(NodeVisitor):
-    """A visitor for `Frame.inspect`."""
-
-    def __init__(self, identifiers):
-        self.identifiers = identifiers
-
-    def visit_Name(self, node):
-        """All assignments to names go through this function."""
-        if node.ctx == 'store':
-            self.identifiers.declared_locally.add(node.name)
-        elif node.ctx == 'param':
-            self.identifiers.declared_parameter.add(node.name)
-        elif node.ctx == 'load' and not \
-             self.identifiers.is_declared(node.name):
-            self.identifiers.undeclared.add(node.name)
-
-    def visit_If(self, node):
-        self.visit(node.test)
-        real_identifiers = self.identifiers
-
-        old_names = real_identifiers.declared_locally | \
-                    real_identifiers.declared_parameter
-
-        def inner_visit(nodes):
-            if not nodes:
-                return set()
-            self.identifiers = real_identifiers.copy()
-            for subnode in nodes:
-                self.visit(subnode)
-            rv = self.identifiers.declared_locally - old_names
-            # we have to remember the undeclared variables of this branch
-            # because we will have to pull them.
-            real_identifiers.undeclared.update(self.identifiers.undeclared)
-            self.identifiers = real_identifiers
-            return rv
-
-        body = inner_visit(node.body)
-        else_ = inner_visit(node.else_ or ())
-
-        # the differences between the two branches are also pulled as
-        # undeclared variables
-        real_identifiers.undeclared.update(body.symmetric_difference(else_) -
-                                           real_identifiers.declared)
-
-        # remember those that are declared.
-        real_identifiers.declared_locally.update(body | else_)
-
-    def visit_Macro(self, node):
-        self.identifiers.declared_locally.add(node.name)
-
-    def visit_Import(self, node):
-        self.generic_visit(node)
-        self.identifiers.declared_locally.add(node.target)
-
-    def visit_FromImport(self, node):
-        self.generic_visit(node)
-        for name in node.names:
-            if isinstance(name, tuple):
-                self.identifiers.declared_locally.add(name[1])
-            else:
-                self.identifiers.declared_locally.add(name)
-
-    def visit_Assign(self, node):
-        """Visit assignments in the correct order."""
-        self.visit(node.node)
-        self.visit(node.target)
-
-    def visit_For(self, node):
-        """Visiting stops at for blocks.  However the block sequence
-        is visited as part of the outer scope.
-        """
-        self.visit(node.iter)
-
-    def visit_CallBlock(self, node):
-        self.visit(node.call)
-
-    def visit_FilterBlock(self, node):
-        self.visit(node.filter)
-
-    def visit_Scope(self, node):
-        """Stop visiting at scopes."""
-
-    def visit_Block(self, node):
-        """Stop visiting at blocks."""
-
-
 class CompilerExit(Exception):
     """Raised if the compiler encountered a situation where it just
     doesn't make sense to further process the code.  Any block that
@@ -362,24 +298,34 @@
 
 
 class CodeGenerator(NodeVisitor):
-
-    def __init__(self, environment, name, filename, stream=None,
-                 defer_init=False):
+    def __init__(
+        self,
+        environment: "Environment",
+        name: t.Optional[str],
+        filename: t.Optional[str],
+        stream: t.Optional[t.TextIO] = None,
+        defer_init: bool = False,
+        optimized: bool = True,
+    ) -> None:
         if stream is None:
-            stream = NativeStringIO()
+            stream = StringIO()
         self.environment = environment
         self.name = name
         self.filename = filename
         self.stream = stream
         self.created_block_context = False
         self.defer_init = defer_init
+        self.optimizer: t.Optional[Optimizer] = None
+
+        if optimized:
+            self.optimizer = Optimizer(environment)
 
         # aliases for imports
-        self.import_aliases = {}
+        self.import_aliases: t.Dict[str, str] = {}
 
         # a registry for all blocks.  Because blocks are moved out
         # into the global python scope they are registered here
-        self.blocks = {}
+        self.blocks: t.Dict[str, nodes.Block] = {}
 
         # the number of extends statements so far
         self.extends_so_far = 0
@@ -393,12 +339,12 @@
         self.code_lineno = 1
 
         # registry of all filters and tests (global, not block local)
-        self.tests = {}
-        self.filters = {}
+        self.tests: t.Dict[str, str] = {}
+        self.filters: t.Dict[str, str] = {}
 
         # the debug information
-        self.debug_info = []
-        self._write_debug_info = None
+        self.debug_info: t.List[t.Tuple[int, int]] = []
+        self._write_debug_info: t.Optional[int] = None
 
         # the number of new lines before the next write()
         self._new_lines = 0
@@ -416,357 +362,485 @@
         # the current indentation
         self._indentation = 0
 
+        # Tracks toplevel assignments
+        self._assign_stack: t.List[t.Set[str]] = []
+
+        # Tracks parameter definition blocks
+        self._param_def_block: t.List[t.Set[str]] = []
+
+        # Tracks the current context.
+        self._context_reference_stack = ["context"]
+
+    @property
+    def optimized(self) -> bool:
+        return self.optimizer is not None
+
     # -- Various compilation helpers
 
-    def fail(self, msg, lineno):
+    def fail(self, msg: str, lineno: int) -> "te.NoReturn":
         """Fail with a :exc:`TemplateAssertionError`."""
         raise TemplateAssertionError(msg, lineno, self.name, self.filename)
 
-    def temporary_identifier(self):
+    def temporary_identifier(self) -> str:
         """Get a new unique identifier."""
         self._last_identifier += 1
-        return 't_%d' % self._last_identifier
+        return f"t_{self._last_identifier}"
 
-    def buffer(self, frame):
+    def buffer(self, frame: Frame) -> None:
         """Enable buffering for the frame from that point onwards."""
         frame.buffer = self.temporary_identifier()
-        self.writeline('%s = []' % frame.buffer)
+        self.writeline(f"{frame.buffer} = []")
 
-    def return_buffer_contents(self, frame):
+    def return_buffer_contents(
+        self, frame: Frame, force_unescaped: bool = False
+    ) -> None:
         """Return the buffer contents of the frame."""
-        if frame.eval_ctx.volatile:
-            self.writeline('if context.eval_ctx.autoescape:')
-            self.indent()
-            self.writeline('return Markup(concat(%s))' % frame.buffer)
-            self.outdent()
-            self.writeline('else:')
-            self.indent()
-            self.writeline('return concat(%s)' % frame.buffer)
-            self.outdent()
-        elif frame.eval_ctx.autoescape:
-            self.writeline('return Markup(concat(%s))' % frame.buffer)
-        else:
-            self.writeline('return concat(%s)' % frame.buffer)
+        if not force_unescaped:
+            if frame.eval_ctx.volatile:
+                self.writeline("if context.eval_ctx.autoescape:")
+                self.indent()
+                self.writeline(f"return Markup(concat({frame.buffer}))")
+                self.outdent()
+                self.writeline("else:")
+                self.indent()
+                self.writeline(f"return concat({frame.buffer})")
+                self.outdent()
+                return
+            elif frame.eval_ctx.autoescape:
+                self.writeline(f"return Markup(concat({frame.buffer}))")
+                return
+        self.writeline(f"return concat({frame.buffer})")
 
-    def indent(self):
+    def indent(self) -> None:
         """Indent by one."""
         self._indentation += 1
 
-    def outdent(self, step=1):
+    def outdent(self, step: int = 1) -> None:
         """Outdent by step."""
         self._indentation -= step
 
-    def start_write(self, frame, node=None):
+    def start_write(self, frame: Frame, node: t.Optional[nodes.Node] = None) -> None:
         """Yield or write into the frame buffer."""
         if frame.buffer is None:
-            self.writeline('yield ', node)
+            self.writeline("yield ", node)
         else:
-            self.writeline('%s.append(' % frame.buffer, node)
+            self.writeline(f"{frame.buffer}.append(", node)
 
-    def end_write(self, frame):
+    def end_write(self, frame: Frame) -> None:
         """End the writing process started by `start_write`."""
         if frame.buffer is not None:
-            self.write(')')
+            self.write(")")
 
-    def simple_write(self, s, frame, node=None):
+    def simple_write(
+        self, s: str, frame: Frame, node: t.Optional[nodes.Node] = None
+    ) -> None:
         """Simple shortcut for start_write + write + end_write."""
         self.start_write(frame, node)
         self.write(s)
         self.end_write(frame)
 
-    def blockvisit(self, nodes, frame):
+    def blockvisit(self, nodes: t.Iterable[nodes.Node], frame: Frame) -> None:
         """Visit a list of nodes as block in a frame.  If the current frame
-        is no buffer a dummy ``if 0: yield None`` is written automatically
-        unless the force_generator parameter is set to False.
+        is no buffer a dummy ``if 0: yield None`` is written automatically.
         """
-        if frame.buffer is None:
-            self.writeline('if 0: yield None')
-        else:
-            self.writeline('pass')
         try:
+            self.writeline("pass")
             for node in nodes:
                 self.visit(node, frame)
         except CompilerExit:
             pass
 
-    def write(self, x):
+    def write(self, x: str) -> None:
         """Write a string into the output stream."""
         if self._new_lines:
             if not self._first_write:
-                self.stream.write('\n' * self._new_lines)
+                self.stream.write("\n" * self._new_lines)
                 self.code_lineno += self._new_lines
                 if self._write_debug_info is not None:
-                    self.debug_info.append((self._write_debug_info,
-                                            self.code_lineno))
+                    self.debug_info.append((self._write_debug_info, self.code_lineno))
                     self._write_debug_info = None
             self._first_write = False
-            self.stream.write('    ' * self._indentation)
+            self.stream.write("    " * self._indentation)
             self._new_lines = 0
         self.stream.write(x)
 
-    def writeline(self, x, node=None, extra=0):
+    def writeline(
+        self, x: str, node: t.Optional[nodes.Node] = None, extra: int = 0
+    ) -> None:
         """Combination of newline and write."""
         self.newline(node, extra)
         self.write(x)
 
-    def newline(self, node=None, extra=0):
+    def newline(self, node: t.Optional[nodes.Node] = None, extra: int = 0) -> None:
         """Add one or more newlines before the next write."""
         self._new_lines = max(self._new_lines, 1 + extra)
         if node is not None and node.lineno != self._last_line:
             self._write_debug_info = node.lineno
             self._last_line = node.lineno
 
-    def signature(self, node, frame, extra_kwargs=None):
+    def signature(
+        self,
+        node: t.Union[nodes.Call, nodes.Filter, nodes.Test],
+        frame: Frame,
+        extra_kwargs: t.Optional[t.Mapping[str, t.Any]] = None,
+    ) -> None:
         """Writes a function call to the stream for the current node.
         A leading comma is added automatically.  The extra keyword
         arguments may not include python keywords otherwise a syntax
-        error could occour.  The extra keyword arguments should be given
+        error could occur.  The extra keyword arguments should be given
         as python dict.
         """
         # if any of the given keyword arguments is a python keyword
         # we have to make sure that no invalid call is created.
-        kwarg_workaround = False
-        for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()):
-            if is_python_keyword(kwarg):
-                kwarg_workaround = True
-                break
+        kwarg_workaround = any(
+            is_python_keyword(t.cast(str, k))
+            for k in chain((x.key for x in node.kwargs), extra_kwargs or ())
+        )
 
         for arg in node.args:
-            self.write(', ')
+            self.write(", ")
             self.visit(arg, frame)
 
         if not kwarg_workaround:
             for kwarg in node.kwargs:
-                self.write(', ')
+                self.write(", ")
                 self.visit(kwarg, frame)
             if extra_kwargs is not None:
-                for key, value in iteritems(extra_kwargs):
-                    self.write(', %s=%s' % (key, value))
+                for key, value in extra_kwargs.items():
+                    self.write(f", {key}={value}")
         if node.dyn_args:
-            self.write(', *')
+            self.write(", *")
             self.visit(node.dyn_args, frame)
 
         if kwarg_workaround:
             if node.dyn_kwargs is not None:
-                self.write(', **dict({')
+                self.write(", **dict({")
             else:
-                self.write(', **{')
+                self.write(", **{")
             for kwarg in node.kwargs:
-                self.write('%r: ' % kwarg.key)
+                self.write(f"{kwarg.key!r}: ")
                 self.visit(kwarg.value, frame)
-                self.write(', ')
+                self.write(", ")
             if extra_kwargs is not None:
-                for key, value in iteritems(extra_kwargs):
-                    self.write('%r: %s, ' % (key, value))
+                for key, value in extra_kwargs.items():
+                    self.write(f"{key!r}: {value}, ")
             if node.dyn_kwargs is not None:
-                self.write('}, **')
+                self.write("}, **")
                 self.visit(node.dyn_kwargs, frame)
-                self.write(')')
+                self.write(")")
             else:
-                self.write('}')
+                self.write("}")
 
         elif node.dyn_kwargs is not None:
-            self.write(', **')
+            self.write(", **")
             self.visit(node.dyn_kwargs, frame)
 
-    def pull_locals(self, frame):
-        """Pull all the references identifiers into the local scope."""
-        for name in frame.identifiers.undeclared:
-            self.writeline('l_%s = context.resolve(%r)' % (name, name))
+    def pull_dependencies(self, nodes: t.Iterable[nodes.Node]) -> None:
+        """Find all filter and test names used in the template and
+        assign them to variables in the compiled namespace. Checking
+        that the names are registered with the environment is done when
+        compiling the Filter and Test nodes. If the node is in an If or
+        CondExpr node, the check is done at runtime instead.
 
-    def pull_dependencies(self, nodes):
-        """Pull all the dependencies."""
+        .. versionchanged:: 3.0
+            Filters and tests in If and CondExpr nodes are checked at
+            runtime instead of compile time.
+        """
         visitor = DependencyFinderVisitor()
+
         for node in nodes:
             visitor.visit(node)
-        for dependency in 'filters', 'tests':
-            mapping = getattr(self, dependency)
-            for name in getattr(visitor, dependency):
-                if name not in mapping:
-                    mapping[name] = self.temporary_identifier()
-                self.writeline('%s = environment.%s[%r]' %
-                               (mapping[name], dependency, name))
 
-    def unoptimize_scope(self, frame):
-        """Disable Python optimizations for the frame."""
-        # XXX: this is not that nice but it has no real overhead.  It
-        # mainly works because python finds the locals before dead code
-        # is removed.  If that breaks we have to add a dummy function
-        # that just accepts the arguments and does nothing.
-        if frame.identifiers.declared:
-            self.writeline('%sdummy(%s)' % (
-                unoptimize_before_dead_code and 'if 0: ' or '',
-                ', '.join('l_' + name for name in frame.identifiers.declared)
-            ))
+        for id_map, names, dependency in (self.filters, visitor.filters, "filters"), (
+            self.tests,
+            visitor.tests,
+            "tests",
+        ):
+            for name in sorted(names):
+                if name not in id_map:
+                    id_map[name] = self.temporary_identifier()
 
-    def push_scope(self, frame, extra_vars=()):
-        """This function returns all the shadowed variables in a dict
-        in the form name: alias and will write the required assignments
-        into the current scope.  No indentation takes place.
+                # add check during runtime that dependencies used inside of executed
+                # blocks are defined, as this step may be skipped during compile time
+                self.writeline("try:")
+                self.indent()
+                self.writeline(f"{id_map[name]} = environment.{dependency}[{name!r}]")
+                self.outdent()
+                self.writeline("except KeyError:")
+                self.indent()
+                self.writeline("@internalcode")
+                self.writeline(f"def {id_map[name]}(*unused):")
+                self.indent()
+                self.writeline(
+                    f'raise TemplateRuntimeError("No {dependency[:-1]}'
+                    f' named {name!r} found.")'
+                )
+                self.outdent()
+                self.outdent()
 
-        This also predefines locally declared variables from the loop
-        body because under some circumstances it may be the case that
+    def enter_frame(self, frame: Frame) -> None:
+        undefs = []
+        for target, (action, param) in frame.symbols.loads.items():
+            if action == VAR_LOAD_PARAMETER:
+                pass
+            elif action == VAR_LOAD_RESOLVE:
+                self.writeline(f"{target} = {self.get_resolve_func()}({param!r})")
+            elif action == VAR_LOAD_ALIAS:
+                self.writeline(f"{target} = {param}")
+            elif action == VAR_LOAD_UNDEFINED:
+                undefs.append(target)
+            else:
+                raise NotImplementedError("unknown load instruction")
+        if undefs:
+            self.writeline(f"{' = '.join(undefs)} = missing")
 
-        `extra_vars` is passed to `Frame.find_shadowed`.
-        """
-        aliases = {}
-        for name in frame.find_shadowed(extra_vars):
-            aliases[name] = ident = self.temporary_identifier()
-            self.writeline('%s = l_%s' % (ident, name))
-        to_declare = set()
-        for name in frame.identifiers.declared_locally:
-            if name not in aliases:
-                to_declare.add('l_' + name)
-        if to_declare:
-            self.writeline(' = '.join(to_declare) + ' = missing')
-        return aliases
+    def leave_frame(self, frame: Frame, with_python_scope: bool = False) -> None:
+        if not with_python_scope:
+            undefs = []
+            for target in frame.symbols.loads:
+                undefs.append(target)
+            if undefs:
+                self.writeline(f"{' = '.join(undefs)} = missing")
 
-    def pop_scope(self, aliases, frame):
-        """Restore all aliases and delete unused variables."""
-        for name, alias in iteritems(aliases):
-            self.writeline('l_%s = %s' % (name, alias))
-        to_delete = set()
-        for name in frame.identifiers.declared_locally:
-            if name not in aliases:
-                to_delete.add('l_' + name)
-        if to_delete:
-            # we cannot use the del statement here because enclosed
-            # scopes can trigger a SyntaxError:
-            #   a = 42; b = lambda: a; del a
-            self.writeline(' = '.join(to_delete) + ' = missing')
+    def choose_async(self, async_value: str = "async ", sync_value: str = "") -> str:
+        return async_value if self.environment.is_async else sync_value
 
-    def function_scoping(self, node, frame, children=None,
-                         find_special=True):
-        """In Jinja a few statements require the help of anonymous
-        functions.  Those are currently macros and call blocks and in
-        the future also recursive loops.  As there is currently
-        technical limitation that doesn't allow reading and writing a
-        variable in a scope where the initial value is coming from an
-        outer scope, this function tries to fall back with a common
-        error message.  Additionally the frame passed is modified so
-        that the argumetns are collected and callers are looked up.
+    def func(self, name: str) -> str:
+        return f"{self.choose_async()}def {name}"
 
-        This will return the modified frame.
-        """
-        # we have to iterate twice over it, make sure that works
-        if children is None:
-            children = node.iter_child_nodes()
-        children = list(children)
-        func_frame = frame.inner()
-        func_frame.inspect(children)
-
-        # variables that are undeclared (accessed before declaration) and
-        # declared locally *and* part of an outside scope raise a template
-        # assertion error. Reason: we can't generate reasonable code from
-        # it without aliasing all the variables.
-        # this could be fixed in Python 3 where we have the nonlocal
-        # keyword or if we switch to bytecode generation
-        overridden_closure_vars = (
-            func_frame.identifiers.undeclared &
-            func_frame.identifiers.declared &
-            (func_frame.identifiers.declared_locally |
-             func_frame.identifiers.declared_parameter)
-        )
-        if overridden_closure_vars:
-            self.fail('It\'s not possible to set and access variables '
-                      'derived from an outer scope! (affects: %s)' %
-                      ', '.join(sorted(overridden_closure_vars)), node.lineno)
-
-        # remove variables from a closure from the frame's undeclared
-        # identifiers.
-        func_frame.identifiers.undeclared -= (
-            func_frame.identifiers.undeclared &
-            func_frame.identifiers.declared
-        )
-
-        # no special variables for this scope, abort early
-        if not find_special:
-            return func_frame
-
-        func_frame.accesses_kwargs = False
-        func_frame.accesses_varargs = False
-        func_frame.accesses_caller = False
-        func_frame.arguments = args = ['l_' + x.name for x in node.args]
-
-        undeclared = find_undeclared(children, ('caller', 'kwargs', 'varargs'))
-
-        if 'caller' in undeclared:
-            func_frame.accesses_caller = True
-            func_frame.identifiers.add_special('caller')
-            args.append('l_caller')
-        if 'kwargs' in undeclared:
-            func_frame.accesses_kwargs = True
-            func_frame.identifiers.add_special('kwargs')
-            args.append('l_kwargs')
-        if 'varargs' in undeclared:
-            func_frame.accesses_varargs = True
-            func_frame.identifiers.add_special('varargs')
-            args.append('l_varargs')
-        return func_frame
-
-    def macro_body(self, node, frame, children=None):
+    def macro_body(
+        self, node: t.Union[nodes.Macro, nodes.CallBlock], frame: Frame
+    ) -> t.Tuple[Frame, MacroRef]:
         """Dump the function def of a macro or call block."""
-        frame = self.function_scoping(node, frame, children)
+        frame = frame.inner()
+        frame.symbols.analyze_node(node)
+        macro_ref = MacroRef(node)
+
+        explicit_caller = None
+        skip_special_params = set()
+        args = []
+
+        for idx, arg in enumerate(node.args):
+            if arg.name == "caller":
+                explicit_caller = idx
+            if arg.name in ("kwargs", "varargs"):
+                skip_special_params.add(arg.name)
+            args.append(frame.symbols.ref(arg.name))
+
+        undeclared = find_undeclared(node.body, ("caller", "kwargs", "varargs"))
+
+        if "caller" in undeclared:
+            # In older Jinja versions there was a bug that allowed caller
+            # to retain the special behavior even if it was mentioned in
+            # the argument list.  However thankfully this was only really
+            # working if it was the last argument.  So we are explicitly
+            # checking this now and error out if it is anywhere else in
+            # the argument list.
+            if explicit_caller is not None:
+                try:
+                    node.defaults[explicit_caller - len(node.args)]
+                except IndexError:
+                    self.fail(
+                        "When defining macros or call blocks the "
+                        'special "caller" argument must be omitted '
+                        "or be given a default.",
+                        node.lineno,
+                    )
+            else:
+                args.append(frame.symbols.declare_parameter("caller"))
+            macro_ref.accesses_caller = True
+        if "kwargs" in undeclared and "kwargs" not in skip_special_params:
+            args.append(frame.symbols.declare_parameter("kwargs"))
+            macro_ref.accesses_kwargs = True
+        if "varargs" in undeclared and "varargs" not in skip_special_params:
+            args.append(frame.symbols.declare_parameter("varargs"))
+            macro_ref.accesses_varargs = True
+
         # macros are delayed, they never require output checks
         frame.require_output_check = False
-        args = frame.arguments
-        # XXX: this is an ugly fix for the loop nesting bug
-        # (tests.test_old_bugs.test_loop_call_bug).  This works around
-        # a identifier nesting problem we have in general.  It's just more
-        # likely to happen in loops which is why we work around it.  The
-        # real solution would be "nonlocal" all the identifiers that are
-        # leaking into a new python frame and might be used both unassigned
-        # and assigned.
-        if 'loop' in frame.identifiers.declared:
-            args = args + ['l_loop=l_loop']
-        self.writeline('def macro(%s):' % ', '.join(args), node)
+        frame.symbols.analyze_node(node)
+        self.writeline(f"{self.func('macro')}({', '.join(args)}):", node)
         self.indent()
+
         self.buffer(frame)
-        self.pull_locals(frame)
+        self.enter_frame(frame)
+
+        self.push_parameter_definitions(frame)
+        for idx, arg in enumerate(node.args):
+            ref = frame.symbols.ref(arg.name)
+            self.writeline(f"if {ref} is missing:")
+            self.indent()
+            try:
+                default = node.defaults[idx - len(node.args)]
+            except IndexError:
+                self.writeline(
+                    f'{ref} = undefined("parameter {arg.name!r} was not provided",'
+                    f" name={arg.name!r})"
+                )
+            else:
+                self.writeline(f"{ref} = ")
+                self.visit(default, frame)
+            self.mark_parameter_stored(ref)
+            self.outdent()
+        self.pop_parameter_definitions()
+
         self.blockvisit(node.body, frame)
-        self.return_buffer_contents(frame)
+        self.return_buffer_contents(frame, force_unescaped=True)
+        self.leave_frame(frame, with_python_scope=True)
         self.outdent()
-        return frame
 
-    def macro_def(self, node, frame):
+        return frame, macro_ref
+
+    def macro_def(self, macro_ref: MacroRef, frame: Frame) -> None:
         """Dump the macro definition for the def created by macro_body."""
-        arg_tuple = ', '.join(repr(x.name) for x in node.args)
-        name = getattr(node, 'name', None)
-        if len(node.args) == 1:
-            arg_tuple += ','
-        self.write('Macro(environment, macro, %r, (%s), (' %
-                   (name, arg_tuple))
-        for arg in node.defaults:
-            self.visit(arg, frame)
-            self.write(', ')
-        self.write('), %r, %r, %r)' % (
-            bool(frame.accesses_kwargs),
-            bool(frame.accesses_varargs),
-            bool(frame.accesses_caller)
-        ))
+        arg_tuple = ", ".join(repr(x.name) for x in macro_ref.node.args)
+        name = getattr(macro_ref.node, "name", None)
+        if len(macro_ref.node.args) == 1:
+            arg_tuple += ","
+        self.write(
+            f"Macro(environment, macro, {name!r}, ({arg_tuple}),"
+            f" {macro_ref.accesses_kwargs!r}, {macro_ref.accesses_varargs!r},"
+            f" {macro_ref.accesses_caller!r}, context.eval_ctx.autoescape)"
+        )
 
-    def position(self, node):
+    def position(self, node: nodes.Node) -> str:
         """Return a human readable position for the node."""
-        rv = 'line %d' % node.lineno
+        rv = f"line {node.lineno}"
         if self.name is not None:
-            rv += ' in ' + repr(self.name)
+            rv = f"{rv} in {self.name!r}"
         return rv
 
+    def dump_local_context(self, frame: Frame) -> str:
+        items_kv = ", ".join(
+            f"{name!r}: {target}"
+            for name, target in frame.symbols.dump_stores().items()
+        )
+        return f"{{{items_kv}}}"
+
+    def write_commons(self) -> None:
+        """Writes a common preamble that is used by root and block functions.
+        Primarily this sets up common local helpers and enforces a generator
+        through a dead branch.
+        """
+        self.writeline("resolve = context.resolve_or_missing")
+        self.writeline("undefined = environment.undefined")
+        self.writeline("concat = environment.concat")
+        # always use the standard Undefined class for the implicit else of
+        # conditional expressions
+        self.writeline("cond_expr_undefined = Undefined")
+        self.writeline("if 0: yield None")
+
+    def push_parameter_definitions(self, frame: Frame) -> None:
+        """Pushes all parameter targets from the given frame into a local
+        stack that permits tracking of yet to be assigned parameters.  In
+        particular this enables the optimization from `visit_Name` to skip
+        undefined expressions for parameters in macros as macros can reference
+        otherwise unbound parameters.
+        """
+        self._param_def_block.append(frame.symbols.dump_param_targets())
+
+    def pop_parameter_definitions(self) -> None:
+        """Pops the current parameter definitions set."""
+        self._param_def_block.pop()
+
+    def mark_parameter_stored(self, target: str) -> None:
+        """Marks a parameter in the current parameter definitions as stored.
+        This will skip the enforced undefined checks.
+        """
+        if self._param_def_block:
+            self._param_def_block[-1].discard(target)
+
+    def push_context_reference(self, target: str) -> None:
+        self._context_reference_stack.append(target)
+
+    def pop_context_reference(self) -> None:
+        self._context_reference_stack.pop()
+
+    def get_context_ref(self) -> str:
+        return self._context_reference_stack[-1]
+
+    def get_resolve_func(self) -> str:
+        target = self._context_reference_stack[-1]
+        if target == "context":
+            return "resolve"
+        return f"{target}.resolve"
+
+    def derive_context(self, frame: Frame) -> str:
+        return f"{self.get_context_ref()}.derived({self.dump_local_context(frame)})"
+
+    def parameter_is_undeclared(self, target: str) -> bool:
+        """Checks if a given target is an undeclared parameter."""
+        if not self._param_def_block:
+            return False
+        return target in self._param_def_block[-1]
+
+    def push_assign_tracking(self) -> None:
+        """Pushes a new layer for assignment tracking."""
+        self._assign_stack.append(set())
+
+    def pop_assign_tracking(self, frame: Frame) -> None:
+        """Pops the topmost level for assignment tracking and updates the
+        context variables if necessary.
+        """
+        vars = self._assign_stack.pop()
+        if (
+            not frame.block_frame
+            and not frame.loop_frame
+            and not frame.toplevel
+            or not vars
+        ):
+            return
+        public_names = [x for x in vars if x[:1] != "_"]
+        if len(vars) == 1:
+            name = next(iter(vars))
+            ref = frame.symbols.ref(name)
+            if frame.loop_frame:
+                self.writeline(f"_loop_vars[{name!r}] = {ref}")
+                return
+            if frame.block_frame:
+                self.writeline(f"_block_vars[{name!r}] = {ref}")
+                return
+            self.writeline(f"context.vars[{name!r}] = {ref}")
+        else:
+            if frame.loop_frame:
+                self.writeline("_loop_vars.update({")
+            elif frame.block_frame:
+                self.writeline("_block_vars.update({")
+            else:
+                self.writeline("context.vars.update({")
+            for idx, name in enumerate(vars):
+                if idx:
+                    self.write(", ")
+                ref = frame.symbols.ref(name)
+                self.write(f"{name!r}: {ref}")
+            self.write("})")
+        if not frame.block_frame and not frame.loop_frame and public_names:
+            if len(public_names) == 1:
+                self.writeline(f"context.exported_vars.add({public_names[0]!r})")
+            else:
+                names_str = ", ".join(map(repr, public_names))
+                self.writeline(f"context.exported_vars.update(({names_str}))")
+
     # -- Statement Visitors
 
-    def visit_Template(self, node, frame=None):
-        assert frame is None, 'no root frame allowed'
+    def visit_Template(
+        self, node: nodes.Template, frame: t.Optional[Frame] = None
+    ) -> None:
+        assert frame is None, "no root frame allowed"
         eval_ctx = EvalContext(self.environment, self.name)
 
-        from jinja2.runtime import __all__ as exported
-        self.writeline('from __future__ import division')
-        self.writeline('from jinja2.runtime import ' + ', '.join(exported))
-        if not unoptimize_before_dead_code:
-            self.writeline('dummy = lambda *x: None')
+        from .runtime import exported, async_exported
+
+        if self.environment.is_async:
+            exported_names = sorted(exported + async_exported)
+        else:
+            exported_names = sorted(exported)
+
+        self.writeline("from jinja2.runtime import " + ", ".join(exported_names))
 
         # if we want a deferred initialization we cannot move the
         # environment into a local name
-        envenv = not self.defer_init and ', environment=environment' or ''
+        envenv = "" if self.defer_init else ", environment=environment"
 
         # do we have an extends tag at all?  If not, we can save some
         # overhead by just not processing any inheritance code.
@@ -775,7 +849,7 @@
         # find all blocks
         for block in node.find_all(nodes.Block):
             if block.name in self.blocks:
-                self.fail('block %r defined twice' % block.name, block.lineno)
+                self.fail(f"block {block.name!r} defined twice", block.lineno)
             self.blocks[block.name] = block
 
         # find all imports and import them
@@ -783,100 +857,137 @@
             if import_.importname not in self.import_aliases:
                 imp = import_.importname
                 self.import_aliases[imp] = alias = self.temporary_identifier()
-                if '.' in imp:
-                    module, obj = imp.rsplit('.', 1)
-                    self.writeline('from %s import %s as %s' %
-                                   (module, obj, alias))
+                if "." in imp:
+                    module, obj = imp.rsplit(".", 1)
+                    self.writeline(f"from {module} import {obj} as {alias}")
                 else:
-                    self.writeline('import %s as %s' % (imp, alias))
+                    self.writeline(f"import {imp} as {alias}")
 
         # add the load name
-        self.writeline('name = %r' % self.name)
+        self.writeline(f"name = {self.name!r}")
 
         # generate the root render function.
-        self.writeline('def root(context%s):' % envenv, extra=1)
+        self.writeline(
+            f"{self.func('root')}(context, missing=missing{envenv}):", extra=1
+        )
+        self.indent()
+        self.write_commons()
 
         # process the root
         frame = Frame(eval_ctx)
-        frame.inspect(node.body)
+        if "self" in find_undeclared(node.body, ("self",)):
+            ref = frame.symbols.declare_parameter("self")
+            self.writeline(f"{ref} = TemplateReference(context)")
+        frame.symbols.analyze_node(node)
         frame.toplevel = frame.rootlevel = True
         frame.require_output_check = have_extends and not self.has_known_extends
-        self.indent()
         if have_extends:
-            self.writeline('parent_template = None')
-        if 'self' in find_undeclared(node.body, ('self',)):
-            frame.identifiers.add_special('self')
-            self.writeline('l_self = TemplateReference(context)')
-        self.pull_locals(frame)
+            self.writeline("parent_template = None")
+        self.enter_frame(frame)
         self.pull_dependencies(node.body)
         self.blockvisit(node.body, frame)
+        self.leave_frame(frame, with_python_scope=True)
         self.outdent()
 
         # make sure that the parent root is called.
         if have_extends:
             if not self.has_known_extends:
                 self.indent()
-                self.writeline('if parent_template is not None:')
+                self.writeline("if parent_template is not None:")
             self.indent()
-            self.writeline('for event in parent_template.'
-                           'root_render_func(context):')
-            self.indent()
-            self.writeline('yield event')
-            self.outdent(2 + (not self.has_known_extends))
+            if not self.environment.is_async:
+                self.writeline("yield from parent_template.root_render_func(context)")
+            else:
+                self.writeline(
+                    "async for event in parent_template.root_render_func(context):"
+                )
+                self.indent()
+                self.writeline("yield event")
+                self.outdent()
+            self.outdent(1 + (not self.has_known_extends))
 
         # at this point we now have the blocks collected and can visit them too.
-        for name, block in iteritems(self.blocks):
-            block_frame = Frame(eval_ctx)
-            block_frame.inspect(block.body)
-            block_frame.block = name
-            self.writeline('def block_%s(context%s):' % (name, envenv),
-                           block, 1)
+        for name, block in self.blocks.items():
+            self.writeline(
+                f"{self.func('block_' + name)}(context, missing=missing{envenv}):",
+                block,
+                1,
+            )
             self.indent()
-            undeclared = find_undeclared(block.body, ('self', 'super'))
-            if 'self' in undeclared:
-                block_frame.identifiers.add_special('self')
-                self.writeline('l_self = TemplateReference(context)')
-            if 'super' in undeclared:
-                block_frame.identifiers.add_special('super')
-                self.writeline('l_super = context.super(%r, '
-                               'block_%s)' % (name, name))
-            self.pull_locals(block_frame)
+            self.write_commons()
+            # It's important that we do not make this frame a child of the
+            # toplevel template.  This would cause a variety of
+            # interesting issues with identifier tracking.
+            block_frame = Frame(eval_ctx)
+            block_frame.block_frame = True
+            undeclared = find_undeclared(block.body, ("self", "super"))
+            if "self" in undeclared:
+                ref = block_frame.symbols.declare_parameter("self")
+                self.writeline(f"{ref} = TemplateReference(context)")
+            if "super" in undeclared:
+                ref = block_frame.symbols.declare_parameter("super")
+                self.writeline(f"{ref} = context.super({name!r}, block_{name})")
+            block_frame.symbols.analyze_node(block)
+            block_frame.block = name
+            self.writeline("_block_vars = {}")
+            self.enter_frame(block_frame)
             self.pull_dependencies(block.body)
             self.blockvisit(block.body, block_frame)
+            self.leave_frame(block_frame, with_python_scope=True)
             self.outdent()
 
-        self.writeline('blocks = {%s}' % ', '.join('%r: block_%s' % (x, x)
-                                                   for x in self.blocks),
-                       extra=1)
+        blocks_kv_str = ", ".join(f"{x!r}: block_{x}" for x in self.blocks)
+        self.writeline(f"blocks = {{{blocks_kv_str}}}", extra=1)
+        debug_kv_str = "&".join(f"{k}={v}" for k, v in self.debug_info)
+        self.writeline(f"debug_info = {debug_kv_str!r}")
 
-        # add a function that returns the debug info
-        self.writeline('debug_info = %r' % '&'.join('%s=%s' % x for x
-                                                    in self.debug_info))
-
-    def visit_Block(self, node, frame):
+    def visit_Block(self, node: nodes.Block, frame: Frame) -> None:
         """Call a block and register it for the template."""
-        level = 1
+        level = 0
         if frame.toplevel:
             # if we know that we are a child template, there is no need to
             # check if we are one
             if self.has_known_extends:
                 return
             if self.extends_so_far > 0:
-                self.writeline('if parent_template is None:')
+                self.writeline("if parent_template is None:")
                 self.indent()
                 level += 1
-        context = node.scoped and 'context.derived(locals())' or 'context'
-        self.writeline('for event in context.blocks[%r][0](%s):' % (
-                       node.name, context), node)
-        self.indent()
-        self.simple_write('event', frame)
+
+        if node.scoped:
+            context = self.derive_context(frame)
+        else:
+            context = self.get_context_ref()
+
+        if node.required:
+            self.writeline(f"if len(context.blocks[{node.name!r}]) <= 1:", node)
+            self.indent()
+            self.writeline(
+                f'raise TemplateRuntimeError("Required block {node.name!r} not found")',
+                node,
+            )
+            self.outdent()
+
+        if not self.environment.is_async and frame.buffer is None:
+            self.writeline(
+                f"yield from context.blocks[{node.name!r}][0]({context})", node
+            )
+        else:
+            self.writeline(
+                f"{self.choose_async()}for event in"
+                f" context.blocks[{node.name!r}][0]({context}):",
+                node,
+            )
+            self.indent()
+            self.simple_write("event", frame)
+            self.outdent()
+
         self.outdent(level)
 
-    def visit_Extends(self, node, frame):
+    def visit_Extends(self, node: nodes.Extends, frame: Frame) -> None:
         """Calls the extender."""
         if not frame.toplevel:
-            self.fail('cannot use extend from a non top-level scope',
-                      node.lineno)
+            self.fail("cannot use extend from a non top-level scope", node.lineno)
 
         # if the number of extends statements in general is zero so
         # far, we don't have to add a check if something extended
@@ -888,10 +999,9 @@
             # time too, but i welcome it not to confuse users by throwing the
             # same error at different times just "because we can".
             if not self.has_known_extends:
-                self.writeline('if parent_template is not None:')
+                self.writeline("if parent_template is not None:")
                 self.indent()
-            self.writeline('raise TemplateRuntimeError(%r)' %
-                           'extended multiple times')
+            self.writeline('raise TemplateRuntimeError("extended multiple times")')
 
             # if we have a known extends already we don't need that code here
             # as we know that the template execution will end here.
@@ -900,14 +1010,12 @@
             else:
                 self.outdent()
 
-        self.writeline('parent_template = environment.get_template(', node)
+        self.writeline("parent_template = environment.get_template(", node)
         self.visit(node.template, frame)
-        self.write(', %r)' % self.name)
-        self.writeline('for name, parent_block in parent_template.'
-                       'blocks.%s():' % dict_item_iter)
+        self.write(f", {self.name!r})")
+        self.writeline("for name, parent_block in parent_template.blocks.items():")
         self.indent()
-        self.writeline('context.blocks.setdefault(name, []).'
-                       'append(parent_block)')
+        self.writeline("context.blocks.setdefault(name, []).append(parent_block)")
         self.outdent()
 
         # if this extends statement was in the root level we can take
@@ -919,78 +1027,88 @@
         # and now we have one more
         self.extends_so_far += 1
 
-    def visit_Include(self, node, frame):
+    def visit_Include(self, node: nodes.Include, frame: Frame) -> None:
         """Handles includes."""
-        if node.with_context:
-            self.unoptimize_scope(frame)
         if node.ignore_missing:
-            self.writeline('try:')
+            self.writeline("try:")
             self.indent()
 
-        func_name = 'get_or_select_template'
+        func_name = "get_or_select_template"
         if isinstance(node.template, nodes.Const):
-            if isinstance(node.template.value, string_types):
-                func_name = 'get_template'
+            if isinstance(node.template.value, str):
+                func_name = "get_template"
             elif isinstance(node.template.value, (tuple, list)):
-                func_name = 'select_template'
+                func_name = "select_template"
         elif isinstance(node.template, (nodes.Tuple, nodes.List)):
-            func_name = 'select_template'
+            func_name = "select_template"
 
-        self.writeline('template = environment.%s(' % func_name, node)
+        self.writeline(f"template = environment.{func_name}(", node)
         self.visit(node.template, frame)
-        self.write(', %r)' % self.name)
+        self.write(f", {self.name!r})")
         if node.ignore_missing:
             self.outdent()
-            self.writeline('except TemplateNotFound:')
+            self.writeline("except TemplateNotFound:")
             self.indent()
-            self.writeline('pass')
+            self.writeline("pass")
             self.outdent()
-            self.writeline('else:')
+            self.writeline("else:")
             self.indent()
 
+        skip_event_yield = False
+        if node.with_context:
+            self.writeline(
+                f"{self.choose_async()}for event in template.root_render_func("
+                "template.new_context(context.get_all(), True,"
+                f" {self.dump_local_context(frame)})):"
+            )
+        elif self.environment.is_async:
+            self.writeline(
+                "for event in (await template._get_default_module_async())"
+                "._body_stream:"
+            )
+        else:
+            self.writeline("yield from template._get_default_module()._body_stream")
+            skip_event_yield = True
+
+        if not skip_event_yield:
+            self.indent()
+            self.simple_write("event", frame)
+            self.outdent()
+
+        if node.ignore_missing:
+            self.outdent()
+
+    def _import_common(
+        self, node: t.Union[nodes.Import, nodes.FromImport], frame: Frame
+    ) -> None:
+        self.write(f"{self.choose_async('await ')}environment.get_template(")
+        self.visit(node.template, frame)
+        self.write(f", {self.name!r}).")
+
         if node.with_context:
-            self.writeline('for event in template.root_render_func('
-                           'template.new_context(context.parent, True, '
-                           'locals())):')
+            f_name = f"make_module{self.choose_async('_async')}"
+            self.write(
+                f"{f_name}(context.get_all(), True, {self.dump_local_context(frame)})"
+            )
         else:
-            self.writeline('for event in template.module._body_stream:')
+            self.write(f"_get_default_module{self.choose_async('_async')}(context)")
 
-        self.indent()
-        self.simple_write('event', frame)
-        self.outdent()
-
-        if node.ignore_missing:
-            self.outdent()
-
-    def visit_Import(self, node, frame):
+    def visit_Import(self, node: nodes.Import, frame: Frame) -> None:
         """Visit regular imports."""
-        if node.with_context:
-            self.unoptimize_scope(frame)
-        self.writeline('l_%s = ' % node.target, node)
+        self.writeline(f"{frame.symbols.ref(node.target)} = ", node)
         if frame.toplevel:
-            self.write('context.vars[%r] = ' % node.target)
-        self.write('environment.get_template(')
-        self.visit(node.template, frame)
-        self.write(', %r).' % self.name)
-        if node.with_context:
-            self.write('make_module(context.parent, True, locals())')
-        else:
-            self.write('module')
-        if frame.toplevel and not node.target.startswith('_'):
-            self.writeline('context.exported_vars.discard(%r)' % node.target)
-        frame.assigned_names.add(node.target)
+            self.write(f"context.vars[{node.target!r}] = ")
 
-    def visit_FromImport(self, node, frame):
+        self._import_common(node, frame)
+
+        if frame.toplevel and not node.target.startswith("_"):
+            self.writeline(f"context.exported_vars.discard({node.target!r})")
+
+    def visit_FromImport(self, node: nodes.FromImport, frame: Frame) -> None:
         """Visit named imports."""
         self.newline(node)
-        self.write('included_template = environment.get_template(')
-        self.visit(node.template, frame)
-        self.write(', %r).' % self.name)
-        if node.with_context:
-            self.write('make_module(context.parent, True)')
-        else:
-            self.write('module')
-
+        self.write("included_template = ")
+        self._import_common(node, frame)
         var_names = []
         discarded_names = []
         for name in node.names:
@@ -998,629 +1116,826 @@
                 name, alias = name
             else:
                 alias = name
-            self.writeline('l_%s = getattr(included_template, '
-                           '%r, missing)' % (alias, name))
-            self.writeline('if l_%s is missing:' % alias)
+            self.writeline(
+                f"{frame.symbols.ref(alias)} ="
+                f" getattr(included_template, {name!r}, missing)"
+            )
+            self.writeline(f"if {frame.symbols.ref(alias)} is missing:")
             self.indent()
-            self.writeline('l_%s = environment.undefined(%r %% '
-                           'included_template.__name__, '
-                           'name=%r)' %
-                           (alias, 'the template %%r (imported on %s) does '
-                           'not export the requested name %s' % (
-                                self.position(node),
-                                repr(name)
-                           ), name))
+            message = (
+                "the template {included_template.__name__!r}"
+                f" (imported on {self.position(node)})"
+                f" does not export the requested name {name!r}"
+            )
+            self.writeline(
+                f"{frame.symbols.ref(alias)} = undefined(f{message!r}, name={name!r})"
+            )
             self.outdent()
             if frame.toplevel:
                 var_names.append(alias)
-                if not alias.startswith('_'):
+                if not alias.startswith("_"):
                     discarded_names.append(alias)
-            frame.assigned_names.add(alias)
 
         if var_names:
             if len(var_names) == 1:
                 name = var_names[0]
-                self.writeline('context.vars[%r] = l_%s' % (name, name))
+                self.writeline(f"context.vars[{name!r}] = {frame.symbols.ref(name)}")
             else:
-                self.writeline('context.vars.update({%s})' % ', '.join(
-                    '%r: l_%s' % (name, name) for name in var_names
-                ))
+                names_kv = ", ".join(
+                    f"{name!r}: {frame.symbols.ref(name)}" for name in var_names
+                )
+                self.writeline(f"context.vars.update({{{names_kv}}})")
         if discarded_names:
             if len(discarded_names) == 1:
-                self.writeline('context.exported_vars.discard(%r)' %
-                               discarded_names[0])
+                self.writeline(f"context.exported_vars.discard({discarded_names[0]!r})")
             else:
-                self.writeline('context.exported_vars.difference_'
-                               'update((%s))' % ', '.join(imap(repr, discarded_names)))
+                names_str = ", ".join(map(repr, discarded_names))
+                self.writeline(
+                    f"context.exported_vars.difference_update(({names_str}))"
+                )
 
-    def visit_For(self, node, frame):
-        # when calculating the nodes for the inner frame we have to exclude
-        # the iterator contents from it
-        children = node.iter_child_nodes(exclude=('iter',))
-        if node.recursive:
-            loop_frame = self.function_scoping(node, frame, children,
-                                               find_special=False)
-        else:
-            loop_frame = frame.inner()
-            loop_frame.inspect(children)
+    def visit_For(self, node: nodes.For, frame: Frame) -> None:
+        loop_frame = frame.inner()
+        loop_frame.loop_frame = True
+        test_frame = frame.inner()
+        else_frame = frame.inner()
 
         # try to figure out if we have an extended loop.  An extended loop
         # is necessary if the loop is in recursive mode if the special loop
-        # variable is accessed in the body.
-        extended_loop = node.recursive or 'loop' in \
-                        find_undeclared(node.iter_child_nodes(
-                            only=('body',)), ('loop',))
+        # variable is accessed in the body if the body is a scoped block.
+        extended_loop = (
+            node.recursive
+            or "loop"
+            in find_undeclared(node.iter_child_nodes(only=("body",)), ("loop",))
+            or any(block.scoped for block in node.find_all(nodes.Block))
+        )
+
+        loop_ref = None
+        if extended_loop:
+            loop_ref = loop_frame.symbols.declare_parameter("loop")
+
+        loop_frame.symbols.analyze_node(node, for_branch="body")
+        if node.else_:
+            else_frame.symbols.analyze_node(node, for_branch="else")
+
+        if node.test:
+            loop_filter_func = self.temporary_identifier()
+            test_frame.symbols.analyze_node(node, for_branch="test")
+            self.writeline(f"{self.func(loop_filter_func)}(fiter):", node.test)
+            self.indent()
+            self.enter_frame(test_frame)
+            self.writeline(self.choose_async("async for ", "for "))
+            self.visit(node.target, loop_frame)
+            self.write(" in ")
+            self.write(self.choose_async("auto_aiter(fiter)", "fiter"))
+            self.write(":")
+            self.indent()
+            self.writeline("if ", node.test)
+            self.visit(node.test, test_frame)
+            self.write(":")
+            self.indent()
+            self.writeline("yield ")
+            self.visit(node.target, loop_frame)
+            self.outdent(3)
+            self.leave_frame(test_frame, with_python_scope=True)
 
         # if we don't have an recursive loop we have to find the shadowed
         # variables at that point.  Because loops can be nested but the loop
         # variable is a special one we have to enforce aliasing for it.
-        if not node.recursive:
-            aliases = self.push_scope(loop_frame, ('loop',))
-
-        # otherwise we set up a buffer and add a function def
-        else:
-            self.writeline('def loop(reciter, loop_render_func, depth=0):', node)
+        if node.recursive:
+            self.writeline(
+                f"{self.func('loop')}(reciter, loop_render_func, depth=0):", node
+            )
             self.indent()
             self.buffer(loop_frame)
-            aliases = {}
+
+            # Use the same buffer for the else frame
+            else_frame.buffer = loop_frame.buffer
 
         # make sure the loop variable is a special one and raise a template
         # assertion error if a loop tries to write to loop
         if extended_loop:
-            self.writeline('l_loop = missing')
-            loop_frame.identifiers.add_special('loop')
-        for name in node.find_all(nodes.Name):
-            if name.ctx == 'store' and name.name == 'loop':
-                self.fail('Can\'t assign to special loop variable '
-                          'in for-loop target', name.lineno)
+            self.writeline(f"{loop_ref} = missing")
 
-        self.pull_locals(loop_frame)
+        for name in node.find_all(nodes.Name):
+            if name.ctx == "store" and name.name == "loop":
+                self.fail(
+                    "Can't assign to special loop variable in for-loop target",
+                    name.lineno,
+                )
+
         if node.else_:
             iteration_indicator = self.temporary_identifier()
-            self.writeline('%s = 1' % iteration_indicator)
+            self.writeline(f"{iteration_indicator} = 1")
 
-        # Create a fake parent loop if the else or test section of a
-        # loop is accessing the special loop variable and no parent loop
-        # exists.
-        if 'loop' not in aliases and 'loop' in find_undeclared(
-           node.iter_child_nodes(only=('else_', 'test')), ('loop',)):
-            self.writeline("l_loop = environment.undefined(%r, name='loop')" %
-                ("'loop' is undefined. the filter section of a loop as well "
-                 "as the else block don't have access to the special 'loop'"
-                 " variable of the current loop.  Because there is no parent "
-                 "loop it's undefined.  Happened in loop on %s" %
-                 self.position(node)))
-
-        self.writeline('for ', node)
+        self.writeline(self.choose_async("async for ", "for "), node)
         self.visit(node.target, loop_frame)
-        self.write(extended_loop and ', l_loop in LoopContext(' or ' in ')
-
-        # if we have an extened loop and a node test, we filter in the
-        # "outer frame".
-        if extended_loop and node.test is not None:
-            self.write('(')
-            self.visit(node.target, loop_frame)
-            self.write(' for ')
-            self.visit(node.target, loop_frame)
-            self.write(' in ')
-            if node.recursive:
-                self.write('reciter')
-            else:
-                self.visit(node.iter, loop_frame)
-            self.write(' if (')
-            test_frame = loop_frame.copy()
-            self.visit(node.test, test_frame)
-            self.write('))')
-
-        elif node.recursive:
-            self.write('reciter')
+        if extended_loop:
+            self.write(f", {loop_ref} in {self.choose_async('Async')}LoopContext(")
         else:
-            self.visit(node.iter, loop_frame)
+            self.write(" in ")
+
+        if node.test:
+            self.write(f"{loop_filter_func}(")
+        if node.recursive:
+            self.write("reciter")
+        else:
+            if self.environment.is_async and not extended_loop:
+                self.write("auto_aiter(")
+            self.visit(node.iter, frame)
+            if self.environment.is_async and not extended_loop:
+                self.write(")")
+        if node.test:
+            self.write(")")
 
         if node.recursive:
-            self.write(', loop_render_func, depth):')
+            self.write(", undefined, loop_render_func, depth):")
         else:
-            self.write(extended_loop and '):' or ':')
-
-        # tests in not extended loops become a continue
-        if not extended_loop and node.test is not None:
-            self.indent()
-            self.writeline('if not ')
-            self.visit(node.test, loop_frame)
-            self.write(':')
-            self.indent()
-            self.writeline('continue')
-            self.outdent(2)
+            self.write(", undefined):" if extended_loop else ":")
 
         self.indent()
+        self.enter_frame(loop_frame)
+
+        self.writeline("_loop_vars = {}")
         self.blockvisit(node.body, loop_frame)
         if node.else_:
-            self.writeline('%s = 0' % iteration_indicator)
+            self.writeline(f"{iteration_indicator} = 0")
         self.outdent()
+        self.leave_frame(
+            loop_frame, with_python_scope=node.recursive and not node.else_
+        )
 
         if node.else_:
-            self.writeline('if %s:' % iteration_indicator)
+            self.writeline(f"if {iteration_indicator}:")
             self.indent()
-            self.blockvisit(node.else_, loop_frame)
+            self.enter_frame(else_frame)
+            self.blockvisit(node.else_, else_frame)
+            self.leave_frame(else_frame)
             self.outdent()
 
-        # reset the aliases if there are any.
-        if not node.recursive:
-            self.pop_scope(aliases, loop_frame)
-
         # if the node was recursive we have to return the buffer contents
         # and start the iteration code
         if node.recursive:
             self.return_buffer_contents(loop_frame)
             self.outdent()
             self.start_write(frame, node)
-            self.write('loop(')
+            self.write(f"{self.choose_async('await ')}loop(")
+            if self.environment.is_async:
+                self.write("auto_aiter(")
             self.visit(node.iter, frame)
-            self.write(', loop)')
+            if self.environment.is_async:
+                self.write(")")
+            self.write(", loop)")
             self.end_write(frame)
 
-    def visit_If(self, node, frame):
+        # at the end of the iteration, clear any assignments made in the
+        # loop from the top level
+        if self._assign_stack:
+            self._assign_stack[-1].difference_update(loop_frame.symbols.stores)
+
+    def visit_If(self, node: nodes.If, frame: Frame) -> None:
         if_frame = frame.soft()
-        self.writeline('if ', node)
+        self.writeline("if ", node)
         self.visit(node.test, if_frame)
-        self.write(':')
+        self.write(":")
         self.indent()
         self.blockvisit(node.body, if_frame)
         self.outdent()
+        for elif_ in node.elif_:
+            self.writeline("elif ", elif_)
+            self.visit(elif_.test, if_frame)
+            self.write(":")
+            self.indent()
+            self.blockvisit(elif_.body, if_frame)
+            self.outdent()
         if node.else_:
-            self.writeline('else:')
+            self.writeline("else:")
             self.indent()
             self.blockvisit(node.else_, if_frame)
             self.outdent()
 
-    def visit_Macro(self, node, frame):
-        macro_frame = self.macro_body(node, frame)
+    def visit_Macro(self, node: nodes.Macro, frame: Frame) -> None:
+        macro_frame, macro_ref = self.macro_body(node, frame)
         self.newline()
         if frame.toplevel:
-            if not node.name.startswith('_'):
-                self.write('context.exported_vars.add(%r)' % node.name)
-            self.writeline('context.vars[%r] = ' % node.name)
-        self.write('l_%s = ' % node.name)
-        self.macro_def(node, macro_frame)
-        frame.assigned_names.add(node.name)
+            if not node.name.startswith("_"):
+                self.write(f"context.exported_vars.add({node.name!r})")
+            self.writeline(f"context.vars[{node.name!r}] = ")
+        self.write(f"{frame.symbols.ref(node.name)} = ")
+        self.macro_def(macro_ref, macro_frame)
 
-    def visit_CallBlock(self, node, frame):
-        children = node.iter_child_nodes(exclude=('call',))
-        call_frame = self.macro_body(node, frame, children)
-        self.writeline('caller = ')
-        self.macro_def(node, call_frame)
+    def visit_CallBlock(self, node: nodes.CallBlock, frame: Frame) -> None:
+        call_frame, macro_ref = self.macro_body(node, frame)
+        self.writeline("caller = ")
+        self.macro_def(macro_ref, call_frame)
         self.start_write(frame, node)
-        self.visit_Call(node.call, call_frame, forward_caller=True)
+        self.visit_Call(node.call, frame, forward_caller=True)
         self.end_write(frame)
 
-    def visit_FilterBlock(self, node, frame):
+    def visit_FilterBlock(self, node: nodes.FilterBlock, frame: Frame) -> None:
         filter_frame = frame.inner()
-        filter_frame.inspect(node.iter_child_nodes())
-        aliases = self.push_scope(filter_frame)
-        self.pull_locals(filter_frame)
+        filter_frame.symbols.analyze_node(node)
+        self.enter_frame(filter_frame)
         self.buffer(filter_frame)
         self.blockvisit(node.body, filter_frame)
         self.start_write(frame, node)
         self.visit_Filter(node.filter, filter_frame)
         self.end_write(frame)
-        self.pop_scope(aliases, filter_frame)
+        self.leave_frame(filter_frame)
 
-    def visit_ExprStmt(self, node, frame):
+    def visit_With(self, node: nodes.With, frame: Frame) -> None:
+        with_frame = frame.inner()
+        with_frame.symbols.analyze_node(node)
+        self.enter_frame(with_frame)
+        for target, expr in zip(node.targets, node.values):
+            self.newline()
+            self.visit(target, with_frame)
+            self.write(" = ")
+            self.visit(expr, frame)
+        self.blockvisit(node.body, with_frame)
+        self.leave_frame(with_frame)
+
+    def visit_ExprStmt(self, node: nodes.ExprStmt, frame: Frame) -> None:
         self.newline(node)
         self.visit(node.node, frame)
 
-    def visit_Output(self, node, frame):
-        # if we have a known extends statement, we don't output anything
-        # if we are in a require_output_check section
-        if self.has_known_extends and frame.require_output_check:
-            return
+    class _FinalizeInfo(t.NamedTuple):
+        const: t.Optional[t.Callable[..., str]]
+        src: t.Optional[str]
+
+    @staticmethod
+    def _default_finalize(value: t.Any) -> t.Any:
+        """The default finalize function if the environment isn't
+        configured with one. Or, if the environment has one, this is
+        called on that function's output for constants.
+        """
+        return str(value)
+
+    _finalize: t.Optional[_FinalizeInfo] = None
+
+    def _make_finalize(self) -> _FinalizeInfo:
+        """Build the finalize function to be used on constants and at
+        runtime. Cached so it's only created once for all output nodes.
+
+        Returns a ``namedtuple`` with the following attributes:
+
+        ``const``
+            A function to finalize constant data at compile time.
+
+        ``src``
+            Source code to output around nodes to be evaluated at
+            runtime.
+        """
+        if self._finalize is not None:
+            return self._finalize
+
+        finalize: t.Optional[t.Callable[..., t.Any]]
+        finalize = default = self._default_finalize
+        src = None
 
         if self.environment.finalize:
-            finalize = lambda x: text_type(self.environment.finalize(x))
+            src = "environment.finalize("
+            env_finalize = self.environment.finalize
+            pass_arg = {
+                _PassArg.context: "context",
+                _PassArg.eval_context: "context.eval_ctx",
+                _PassArg.environment: "environment",
+            }.get(
+                _PassArg.from_obj(env_finalize)  # type: ignore
+            )
+            finalize = None
+
+            if pass_arg is None:
+
+                def finalize(value: t.Any) -> t.Any:
+                    return default(env_finalize(value))
+
+            else:
+                src = f"{src}{pass_arg}, "
+
+                if pass_arg == "environment":
+
+                    def finalize(value: t.Any) -> t.Any:
+                        return default(env_finalize(self.environment, value))
+
+        self._finalize = self._FinalizeInfo(finalize, src)
+        return self._finalize
+
+    def _output_const_repr(self, group: t.Iterable[t.Any]) -> str:
+        """Given a group of constant values converted from ``Output``
+        child nodes, produce a string to write to the template module
+        source.
+        """
+        return repr(concat(group))
+
+    def _output_child_to_const(
+        self, node: nodes.Expr, frame: Frame, finalize: _FinalizeInfo
+    ) -> str:
+        """Try to optimize a child of an ``Output`` node by trying to
+        convert it to constant, finalized data at compile time.
+
+        If :exc:`Impossible` is raised, the node is not constant and
+        will be evaluated at runtime. Any other exception will also be
+        evaluated at runtime for easier debugging.
+        """
+        const = node.as_const(frame.eval_ctx)
+
+        if frame.eval_ctx.autoescape:
+            const = escape(const)
+
+        # Template data doesn't go through finalize.
+        if isinstance(node, nodes.TemplateData):
+            return str(const)
+
+        return finalize.const(const)  # type: ignore
+
+    def _output_child_pre(
+        self, node: nodes.Expr, frame: Frame, finalize: _FinalizeInfo
+    ) -> None:
+        """Output extra source code before visiting a child of an
+        ``Output`` node.
+        """
+        if frame.eval_ctx.volatile:
+            self.write("(escape if context.eval_ctx.autoescape else str)(")
+        elif frame.eval_ctx.autoescape:
+            self.write("escape(")
         else:
-            finalize = text_type
+            self.write("str(")
 
-        # if we are inside a frame that requires output checking, we do so
-        outdent_later = False
+        if finalize.src is not None:
+            self.write(finalize.src)
+
+    def _output_child_post(
+        self, node: nodes.Expr, frame: Frame, finalize: _FinalizeInfo
+    ) -> None:
+        """Output extra source code after visiting a child of an
+        ``Output`` node.
+        """
+        self.write(")")
+
+        if finalize.src is not None:
+            self.write(")")
+
+    def visit_Output(self, node: nodes.Output, frame: Frame) -> None:
+        # If an extends is active, don't render outside a block.
         if frame.require_output_check:
-            self.writeline('if parent_template is None:')
-            self.indent()
-            outdent_later = True
+            # A top-level extends is known to exist at compile time.
+            if self.has_known_extends:
+                return
 
-        # try to evaluate as many chunks as possible into a static
-        # string at compile time.
-        body = []
+            self.writeline("if parent_template is None:")
+            self.indent()
+
+        finalize = self._make_finalize()
+        body: t.List[t.Union[t.List[t.Any], nodes.Expr]] = []
+
+        # Evaluate constants at compile time if possible. Each item in
+        # body will be either a list of static data or a node to be
+        # evaluated at runtime.
         for child in node.nodes:
             try:
-                const = child.as_const(frame.eval_ctx)
-            except nodes.Impossible:
+                if not (
+                    # If the finalize function requires runtime context,
+                    # constants can't be evaluated at compile time.
+                    finalize.const
+                    # Unless it's basic template data that won't be
+                    # finalized anyway.
+                    or isinstance(child, nodes.TemplateData)
+                ):
+                    raise nodes.Impossible()
+
+                const = self._output_child_to_const(child, frame, finalize)
+            except (nodes.Impossible, Exception):
+                # The node was not constant and needs to be evaluated at
+                # runtime. Or another error was raised, which is easier
+                # to debug at runtime.
                 body.append(child)
                 continue
-            # the frame can't be volatile here, becaus otherwise the
-            # as_const() function would raise an Impossible exception
-            # at that point.
-            try:
-                if frame.eval_ctx.autoescape:
-                    if hasattr(const, '__html__'):
-                        const = const.__html__()
-                    else:
-                        const = escape(const)
-                const = finalize(const)
-            except Exception:
-                # if something goes wrong here we evaluate the node
-                # at runtime for easier debugging
-                body.append(child)
-                continue
+
             if body and isinstance(body[-1], list):
                 body[-1].append(const)
             else:
                 body.append([const])
 
-        # if we have less than 3 nodes or a buffer we yield or extend/append
-        if len(body) < 3 or frame.buffer is not None:
-            if frame.buffer is not None:
-                # for one item we append, for more we extend
-                if len(body) == 1:
-                    self.writeline('%s.append(' % frame.buffer)
-                else:
-                    self.writeline('%s.extend((' % frame.buffer)
-                self.indent()
-            for item in body:
-                if isinstance(item, list):
-                    val = repr(concat(item))
-                    if frame.buffer is None:
-                        self.writeline('yield ' + val)
-                    else:
-                        self.writeline(val + ', ')
-                else:
-                    if frame.buffer is None:
-                        self.writeline('yield ', item)
-                    else:
-                        self.newline(item)
-                    close = 1
-                    if frame.eval_ctx.volatile:
-                        self.write('(context.eval_ctx.autoescape and'
-                                   ' escape or to_string)(')
-                    elif frame.eval_ctx.autoescape:
-                        self.write('escape(')
-                    else:
-                        self.write('to_string(')
-                    if self.environment.finalize is not None:
-                        self.write('environment.finalize(')
-                        close += 1
-                    self.visit(item, frame)
-                    self.write(')' * close)
-                    if frame.buffer is not None:
-                        self.write(', ')
-            if frame.buffer is not None:
-                # close the open parentheses
-                self.outdent()
-                self.writeline(len(body) == 1 and ')' or '))')
-
-        # otherwise we create a format string as this is faster in that case
-        else:
-            format = []
-            arguments = []
-            for item in body:
-                if isinstance(item, list):
-                    format.append(concat(item).replace('%', '%%'))
-                else:
-                    format.append('%s')
-                    arguments.append(item)
-            self.writeline('yield ')
-            self.write(repr(concat(format)) + ' % (')
-            idx = -1
-            self.indent()
-            for argument in arguments:
-                self.newline(argument)
-                close = 0
-                if frame.eval_ctx.volatile:
-                    self.write('(context.eval_ctx.autoescape and'
-                               ' escape or to_string)(')
-                    close += 1
-                elif frame.eval_ctx.autoescape:
-                    self.write('escape(')
-                    close += 1
-                if self.environment.finalize is not None:
-                    self.write('environment.finalize(')
-                    close += 1
-                self.visit(argument, frame)
-                self.write(')' * close + ', ')
-            self.outdent()
-            self.writeline(')')
-
-        if outdent_later:
-            self.outdent()
-
-    def visit_Assign(self, node, frame):
-        self.newline(node)
-        # toplevel assignments however go into the local namespace and
-        # the current template's context.  We create a copy of the frame
-        # here and add a set so that the Name visitor can add the assigned
-        # names here.
-        if frame.toplevel:
-            assignment_frame = frame.copy()
-            assignment_frame.toplevel_assignments = set()
-        else:
-            assignment_frame = frame
-        self.visit(node.target, assignment_frame)
-        self.write(' = ')
-        self.visit(node.node, frame)
-
-        # make sure toplevel assignments are added to the context.
-        if frame.toplevel:
-            public_names = [x for x in assignment_frame.toplevel_assignments
-                            if not x.startswith('_')]
-            if len(assignment_frame.toplevel_assignments) == 1:
-                name = next(iter(assignment_frame.toplevel_assignments))
-                self.writeline('context.vars[%r] = l_%s' % (name, name))
+        if frame.buffer is not None:
+            if len(body) == 1:
+                self.writeline(f"{frame.buffer}.append(")
             else:
-                self.writeline('context.vars.update({')
-                for idx, name in enumerate(assignment_frame.toplevel_assignments):
-                    if idx:
-                        self.write(', ')
-                    self.write('%r: l_%s' % (name, name))
-                self.write('})')
-            if public_names:
-                if len(public_names) == 1:
-                    self.writeline('context.exported_vars.add(%r)' %
-                                   public_names[0])
+                self.writeline(f"{frame.buffer}.extend((")
+
+            self.indent()
+
+        for item in body:
+            if isinstance(item, list):
+                # A group of constant data to join and output.
+                val = self._output_const_repr(item)
+
+                if frame.buffer is None:
+                    self.writeline("yield " + val)
                 else:
-                    self.writeline('context.exported_vars.update((%s))' %
-                                   ', '.join(imap(repr, public_names)))
+                    self.writeline(val + ",")
+            else:
+                if frame.buffer is None:
+                    self.writeline("yield ", item)
+                else:
+                    self.newline(item)
+
+                # A node to be evaluated at runtime.
+                self._output_child_pre(item, frame, finalize)
+                self.visit(item, frame)
+                self._output_child_post(item, frame, finalize)
+
+                if frame.buffer is not None:
+                    self.write(",")
+
+        if frame.buffer is not None:
+            self.outdent()
+            self.writeline(")" if len(body) == 1 else "))")
+
+        if frame.require_output_check:
+            self.outdent()
+
+    def visit_Assign(self, node: nodes.Assign, frame: Frame) -> None:
+        self.push_assign_tracking()
+        self.newline(node)
+        self.visit(node.target, frame)
+        self.write(" = ")
+        self.visit(node.node, frame)
+        self.pop_assign_tracking(frame)
+
+    def visit_AssignBlock(self, node: nodes.AssignBlock, frame: Frame) -> None:
+        self.push_assign_tracking()
+        block_frame = frame.inner()
+        # This is a special case.  Since a set block always captures we
+        # will disable output checks.  This way one can use set blocks
+        # toplevel even in extended templates.
+        block_frame.require_output_check = False
+        block_frame.symbols.analyze_node(node)
+        self.enter_frame(block_frame)
+        self.buffer(block_frame)
+        self.blockvisit(node.body, block_frame)
+        self.newline(node)
+        self.visit(node.target, frame)
+        self.write(" = (Markup if context.eval_ctx.autoescape else identity)(")
+        if node.filter is not None:
+            self.visit_Filter(node.filter, block_frame)
+        else:
+            self.write(f"concat({block_frame.buffer})")
+        self.write(")")
+        self.pop_assign_tracking(frame)
+        self.leave_frame(block_frame)
 
     # -- Expression Visitors
 
-    def visit_Name(self, node, frame):
-        if node.ctx == 'store' and frame.toplevel:
-            frame.toplevel_assignments.add(node.name)
-        self.write('l_' + node.name)
-        frame.assigned_names.add(node.name)
+    def visit_Name(self, node: nodes.Name, frame: Frame) -> None:
+        if node.ctx == "store" and (
+            frame.toplevel or frame.loop_frame or frame.block_frame
+        ):
+            if self._assign_stack:
+                self._assign_stack[-1].add(node.name)
+        ref = frame.symbols.ref(node.name)
 
-    def visit_Const(self, node, frame):
-        val = node.value
+        # If we are looking up a variable we might have to deal with the
+        # case where it's undefined.  We can skip that case if the load
+        # instruction indicates a parameter which are always defined.
+        if node.ctx == "load":
+            load = frame.symbols.find_load(ref)
+            if not (
+                load is not None
+                and load[0] == VAR_LOAD_PARAMETER
+                and not self.parameter_is_undeclared(ref)
+            ):
+                self.write(
+                    f"(undefined(name={node.name!r}) if {ref} is missing else {ref})"
+                )
+                return
+
+        self.write(ref)
+
+    def visit_NSRef(self, node: nodes.NSRef, frame: Frame) -> None:
+        # NSRefs can only be used to store values; since they use the normal
+        # `foo.bar` notation they will be parsed as a normal attribute access
+        # when used anywhere but in a `set` context
+        ref = frame.symbols.ref(node.name)
+        self.writeline(f"if not isinstance({ref}, Namespace):")
+        self.indent()
+        self.writeline(
+            "raise TemplateRuntimeError"
+            '("cannot assign attribute on non-namespace object")'
+        )
+        self.outdent()
+        self.writeline(f"{ref}[{node.attr!r}]")
+
+    def visit_Const(self, node: nodes.Const, frame: Frame) -> None:
+        val = node.as_const(frame.eval_ctx)
         if isinstance(val, float):
             self.write(str(val))
         else:
             self.write(repr(val))
 
-    def visit_TemplateData(self, node, frame):
+    def visit_TemplateData(self, node: nodes.TemplateData, frame: Frame) -> None:
         try:
             self.write(repr(node.as_const(frame.eval_ctx)))
         except nodes.Impossible:
-            self.write('(context.eval_ctx.autoescape and Markup or identity)(%r)'
-                       % node.data)
+            self.write(
+                f"(Markup if context.eval_ctx.autoescape else identity)({node.data!r})"
+            )
 
-    def visit_Tuple(self, node, frame):
-        self.write('(')
+    def visit_Tuple(self, node: nodes.Tuple, frame: Frame) -> None:
+        self.write("(")
         idx = -1
         for idx, item in enumerate(node.items):
             if idx:
-                self.write(', ')
+                self.write(", ")
             self.visit(item, frame)
-        self.write(idx == 0 and ',)' or ')')
+        self.write(",)" if idx == 0 else ")")
 
-    def visit_List(self, node, frame):
-        self.write('[')
+    def visit_List(self, node: nodes.List, frame: Frame) -> None:
+        self.write("[")
         for idx, item in enumerate(node.items):
             if idx:
-                self.write(', ')
+                self.write(", ")
             self.visit(item, frame)
-        self.write(']')
+        self.write("]")
 
-    def visit_Dict(self, node, frame):
-        self.write('{')
+    def visit_Dict(self, node: nodes.Dict, frame: Frame) -> None:
+        self.write("{")
         for idx, item in enumerate(node.items):
             if idx:
-                self.write(', ')
+                self.write(", ")
             self.visit(item.key, frame)
-            self.write(': ')
+            self.write(": ")
             self.visit(item.value, frame)
-        self.write('}')
+        self.write("}")
 
-    def binop(operator, interceptable=True):
-        def visitor(self, node, frame):
-            if self.environment.sandboxed and \
-               operator in self.environment.intercepted_binops:
-                self.write('environment.call_binop(context, %r, ' % operator)
-                self.visit(node.left, frame)
-                self.write(', ')
-                self.visit(node.right, frame)
-            else:
-                self.write('(')
-                self.visit(node.left, frame)
-                self.write(' %s ' % operator)
-                self.visit(node.right, frame)
-            self.write(')')
-        return visitor
+    visit_Add = _make_binop("+")
+    visit_Sub = _make_binop("-")
+    visit_Mul = _make_binop("*")
+    visit_Div = _make_binop("/")
+    visit_FloorDiv = _make_binop("//")
+    visit_Pow = _make_binop("**")
+    visit_Mod = _make_binop("%")
+    visit_And = _make_binop("and")
+    visit_Or = _make_binop("or")
+    visit_Pos = _make_unop("+")
+    visit_Neg = _make_unop("-")
+    visit_Not = _make_unop("not ")
 
-    def uaop(operator, interceptable=True):
-        def visitor(self, node, frame):
-            if self.environment.sandboxed and \
-               operator in self.environment.intercepted_unops:
-                self.write('environment.call_unop(context, %r, ' % operator)
-                self.visit(node.node, frame)
-            else:
-                self.write('(' + operator)
-                self.visit(node.node, frame)
-            self.write(')')
-        return visitor
-
-    visit_Add = binop('+')
-    visit_Sub = binop('-')
-    visit_Mul = binop('*')
-    visit_Div = binop('/')
-    visit_FloorDiv = binop('//')
-    visit_Pow = binop('**')
-    visit_Mod = binop('%')
-    visit_And = binop('and', interceptable=False)
-    visit_Or = binop('or', interceptable=False)
-    visit_Pos = uaop('+')
-    visit_Neg = uaop('-')
-    visit_Not = uaop('not ', interceptable=False)
-    del binop, uaop
-
-    def visit_Concat(self, node, frame):
+    @optimizeconst
+    def visit_Concat(self, node: nodes.Concat, frame: Frame) -> None:
         if frame.eval_ctx.volatile:
-            func_name = '(context.eval_ctx.volatile and' \
-                        ' markup_join or unicode_join)'
+            func_name = "(markup_join if context.eval_ctx.volatile else str_join)"
         elif frame.eval_ctx.autoescape:
-            func_name = 'markup_join'
+            func_name = "markup_join"
         else:
-            func_name = 'unicode_join'
-        self.write('%s((' % func_name)
+            func_name = "str_join"
+        self.write(f"{func_name}((")
         for arg in node.nodes:
             self.visit(arg, frame)
-            self.write(', ')
-        self.write('))')
+            self.write(", ")
+        self.write("))")
 
-    def visit_Compare(self, node, frame):
+    @optimizeconst
+    def visit_Compare(self, node: nodes.Compare, frame: Frame) -> None:
+        self.write("(")
         self.visit(node.expr, frame)
         for op in node.ops:
             self.visit(op, frame)
+        self.write(")")
 
-    def visit_Operand(self, node, frame):
-        self.write(' %s ' % operators[node.op])
+    def visit_Operand(self, node: nodes.Operand, frame: Frame) -> None:
+        self.write(f" {operators[node.op]} ")
         self.visit(node.expr, frame)
 
-    def visit_Getattr(self, node, frame):
-        self.write('environment.getattr(')
-        self.visit(node.node, frame)
-        self.write(', %r)' % node.attr)
+    @optimizeconst
+    def visit_Getattr(self, node: nodes.Getattr, frame: Frame) -> None:
+        if self.environment.is_async:
+            self.write("(await auto_await(")
 
-    def visit_Getitem(self, node, frame):
+        self.write("environment.getattr(")
+        self.visit(node.node, frame)
+        self.write(f", {node.attr!r})")
+
+        if self.environment.is_async:
+            self.write("))")
+
+    @optimizeconst
+    def visit_Getitem(self, node: nodes.Getitem, frame: Frame) -> None:
         # slices bypass the environment getitem method.
         if isinstance(node.arg, nodes.Slice):
             self.visit(node.node, frame)
-            self.write('[')
+            self.write("[")
             self.visit(node.arg, frame)
-            self.write(']')
+            self.write("]")
         else:
-            self.write('environment.getitem(')
-            self.visit(node.node, frame)
-            self.write(', ')
-            self.visit(node.arg, frame)
-            self.write(')')
+            if self.environment.is_async:
+                self.write("(await auto_await(")
 
-    def visit_Slice(self, node, frame):
+            self.write("environment.getitem(")
+            self.visit(node.node, frame)
+            self.write(", ")
+            self.visit(node.arg, frame)
+            self.write(")")
+
+            if self.environment.is_async:
+                self.write("))")
+
+    def visit_Slice(self, node: nodes.Slice, frame: Frame) -> None:
         if node.start is not None:
             self.visit(node.start, frame)
-        self.write(':')
+        self.write(":")
         if node.stop is not None:
             self.visit(node.stop, frame)
         if node.step is not None:
-            self.write(':')
+            self.write(":")
             self.visit(node.step, frame)
 
-    def visit_Filter(self, node, frame):
-        self.write(self.filters[node.name] + '(')
-        func = self.environment.filters.get(node.name)
-        if func is None:
-            self.fail('no filter named %r' % node.name, node.lineno)
-        if getattr(func, 'contextfilter', False):
-            self.write('context, ')
-        elif getattr(func, 'evalcontextfilter', False):
-            self.write('context.eval_ctx, ')
-        elif getattr(func, 'environmentfilter', False):
-            self.write('environment, ')
+    @contextmanager
+    def _filter_test_common(
+        self, node: t.Union[nodes.Filter, nodes.Test], frame: Frame, is_filter: bool
+    ) -> t.Iterator[None]:
+        if self.environment.is_async:
+            self.write("(await auto_await(")
 
-        # if the filter node is None we are inside a filter block
-        # and want to write to the current buffer
-        if node.node is not None:
+        if is_filter:
+            self.write(f"{self.filters[node.name]}(")
+            func = self.environment.filters.get(node.name)
+        else:
+            self.write(f"{self.tests[node.name]}(")
+            func = self.environment.tests.get(node.name)
+
+        # When inside an If or CondExpr frame, allow the filter to be
+        # undefined at compile time and only raise an error if it's
+        # actually called at runtime. See pull_dependencies.
+        if func is None and not frame.soft_frame:
+            type_name = "filter" if is_filter else "test"
+            self.fail(f"No {type_name} named {node.name!r}.", node.lineno)
+
+        pass_arg = {
+            _PassArg.context: "context",
+            _PassArg.eval_context: "context.eval_ctx",
+            _PassArg.environment: "environment",
+        }.get(
+            _PassArg.from_obj(func)  # type: ignore
+        )
+
+        if pass_arg is not None:
+            self.write(f"{pass_arg}, ")
+
+        # Back to the visitor function to handle visiting the target of
+        # the filter or test.
+        yield
+
+        self.signature(node, frame)
+        self.write(")")
+
+        if self.environment.is_async:
+            self.write("))")
+
+    @optimizeconst
+    def visit_Filter(self, node: nodes.Filter, frame: Frame) -> None:
+        with self._filter_test_common(node, frame, True):
+            # if the filter node is None we are inside a filter block
+            # and want to write to the current buffer
+            if node.node is not None:
+                self.visit(node.node, frame)
+            elif frame.eval_ctx.volatile:
+                self.write(
+                    f"(Markup(concat({frame.buffer}))"
+                    f" if context.eval_ctx.autoescape else concat({frame.buffer}))"
+                )
+            elif frame.eval_ctx.autoescape:
+                self.write(f"Markup(concat({frame.buffer}))")
+            else:
+                self.write(f"concat({frame.buffer})")
+
+    @optimizeconst
+    def visit_Test(self, node: nodes.Test, frame: Frame) -> None:
+        with self._filter_test_common(node, frame, False):
             self.visit(node.node, frame)
-        elif frame.eval_ctx.volatile:
-            self.write('(context.eval_ctx.autoescape and'
-                       ' Markup(concat(%s)) or concat(%s))' %
-                       (frame.buffer, frame.buffer))
-        elif frame.eval_ctx.autoescape:
-            self.write('Markup(concat(%s))' % frame.buffer)
-        else:
-            self.write('concat(%s)' % frame.buffer)
-        self.signature(node, frame)
-        self.write(')')
 
-    def visit_Test(self, node, frame):
-        self.write(self.tests[node.name] + '(')
-        if node.name not in self.environment.tests:
-            self.fail('no test named %r' % node.name, node.lineno)
-        self.visit(node.node, frame)
-        self.signature(node, frame)
-        self.write(')')
+    @optimizeconst
+    def visit_CondExpr(self, node: nodes.CondExpr, frame: Frame) -> None:
+        frame = frame.soft()
 
-    def visit_CondExpr(self, node, frame):
-        def write_expr2():
+        def write_expr2() -> None:
             if node.expr2 is not None:
-                return self.visit(node.expr2, frame)
-            self.write('environment.undefined(%r)' % ('the inline if-'
-                       'expression on %s evaluated to false and '
-                       'no else section was defined.' % self.position(node)))
+                self.visit(node.expr2, frame)
+                return
 
-        self.write('(')
+            self.write(
+                f'cond_expr_undefined("the inline if-expression on'
+                f" {self.position(node)} evaluated to false and no else"
+                f' section was defined.")'
+            )
+
+        self.write("(")
         self.visit(node.expr1, frame)
-        self.write(' if ')
+        self.write(" if ")
         self.visit(node.test, frame)
-        self.write(' else ')
+        self.write(" else ")
         write_expr2()
-        self.write(')')
+        self.write(")")
 
-    def visit_Call(self, node, frame, forward_caller=False):
+    @optimizeconst
+    def visit_Call(
+        self, node: nodes.Call, frame: Frame, forward_caller: bool = False
+    ) -> None:
+        if self.environment.is_async:
+            self.write("(await auto_await(")
         if self.environment.sandboxed:
-            self.write('environment.call(context, ')
+            self.write("environment.call(context, ")
         else:
-            self.write('context.call(')
+            self.write("context.call(")
         self.visit(node.node, frame)
-        extra_kwargs = forward_caller and {'caller': 'caller'} or None
+        extra_kwargs = {"caller": "caller"} if forward_caller else None
+        loop_kwargs = {"_loop_vars": "_loop_vars"} if frame.loop_frame else {}
+        block_kwargs = {"_block_vars": "_block_vars"} if frame.block_frame else {}
+        if extra_kwargs:
+            extra_kwargs.update(loop_kwargs, **block_kwargs)
+        elif loop_kwargs or block_kwargs:
+            extra_kwargs = dict(loop_kwargs, **block_kwargs)
         self.signature(node, frame, extra_kwargs)
-        self.write(')')
+        self.write(")")
+        if self.environment.is_async:
+            self.write("))")
 
-    def visit_Keyword(self, node, frame):
-        self.write(node.key + '=')
+    def visit_Keyword(self, node: nodes.Keyword, frame: Frame) -> None:
+        self.write(node.key + "=")
         self.visit(node.value, frame)
 
     # -- Unused nodes for extensions
 
-    def visit_MarkSafe(self, node, frame):
-        self.write('Markup(')
+    def visit_MarkSafe(self, node: nodes.MarkSafe, frame: Frame) -> None:
+        self.write("Markup(")
         self.visit(node.expr, frame)
-        self.write(')')
+        self.write(")")
 
-    def visit_MarkSafeIfAutoescape(self, node, frame):
-        self.write('(context.eval_ctx.autoescape and Markup or identity)(')
+    def visit_MarkSafeIfAutoescape(
+        self, node: nodes.MarkSafeIfAutoescape, frame: Frame
+    ) -> None:
+        self.write("(Markup if context.eval_ctx.autoescape else identity)(")
         self.visit(node.expr, frame)
-        self.write(')')
+        self.write(")")
 
-    def visit_EnvironmentAttribute(self, node, frame):
-        self.write('environment.' + node.name)
+    def visit_EnvironmentAttribute(
+        self, node: nodes.EnvironmentAttribute, frame: Frame
+    ) -> None:
+        self.write("environment." + node.name)
 
-    def visit_ExtensionAttribute(self, node, frame):
-        self.write('environment.extensions[%r].%s' % (node.identifier, node.name))
+    def visit_ExtensionAttribute(
+        self, node: nodes.ExtensionAttribute, frame: Frame
+    ) -> None:
+        self.write(f"environment.extensions[{node.identifier!r}].{node.name}")
 
-    def visit_ImportedName(self, node, frame):
+    def visit_ImportedName(self, node: nodes.ImportedName, frame: Frame) -> None:
         self.write(self.import_aliases[node.importname])
 
-    def visit_InternalName(self, node, frame):
+    def visit_InternalName(self, node: nodes.InternalName, frame: Frame) -> None:
         self.write(node.name)
 
-    def visit_ContextReference(self, node, frame):
-        self.write('context')
+    def visit_ContextReference(
+        self, node: nodes.ContextReference, frame: Frame
+    ) -> None:
+        self.write("context")
 
-    def visit_Continue(self, node, frame):
-        self.writeline('continue', node)
+    def visit_DerivedContextReference(
+        self, node: nodes.DerivedContextReference, frame: Frame
+    ) -> None:
+        self.write(self.derive_context(frame))
 
-    def visit_Break(self, node, frame):
-        self.writeline('break', node)
+    def visit_Continue(self, node: nodes.Continue, frame: Frame) -> None:
+        self.writeline("continue", node)
 
-    def visit_Scope(self, node, frame):
+    def visit_Break(self, node: nodes.Break, frame: Frame) -> None:
+        self.writeline("break", node)
+
+    def visit_Scope(self, node: nodes.Scope, frame: Frame) -> None:
         scope_frame = frame.inner()
-        scope_frame.inspect(node.iter_child_nodes())
-        aliases = self.push_scope(scope_frame)
-        self.pull_locals(scope_frame)
+        scope_frame.symbols.analyze_node(node)
+        self.enter_frame(scope_frame)
         self.blockvisit(node.body, scope_frame)
-        self.pop_scope(aliases, scope_frame)
+        self.leave_frame(scope_frame)
 
-    def visit_EvalContextModifier(self, node, frame):
+    def visit_OverlayScope(self, node: nodes.OverlayScope, frame: Frame) -> None:
+        ctx = self.temporary_identifier()
+        self.writeline(f"{ctx} = {self.derive_context(frame)}")
+        self.writeline(f"{ctx}.vars = ")
+        self.visit(node.context, frame)
+        self.push_context_reference(ctx)
+
+        scope_frame = frame.inner(isolated=True)
+        scope_frame.symbols.analyze_node(node)
+        self.enter_frame(scope_frame)
+        self.blockvisit(node.body, scope_frame)
+        self.leave_frame(scope_frame)
+        self.pop_context_reference()
+
+    def visit_EvalContextModifier(
+        self, node: nodes.EvalContextModifier, frame: Frame
+    ) -> None:
         for keyword in node.options:
-            self.writeline('context.eval_ctx.%s = ' % keyword.key)
+            self.writeline(f"context.eval_ctx.{keyword.key} = ")
             self.visit(keyword.value, frame)
             try:
                 val = keyword.value.as_const(frame.eval_ctx)
@@ -1629,12 +1944,14 @@
             else:
                 setattr(frame.eval_ctx, keyword.key, val)
 
-    def visit_ScopedEvalContextModifier(self, node, frame):
+    def visit_ScopedEvalContextModifier(
+        self, node: nodes.ScopedEvalContextModifier, frame: Frame
+    ) -> None:
         old_ctx_name = self.temporary_identifier()
-        safed_ctx = frame.eval_ctx.save()
-        self.writeline('%s = context.eval_ctx.save()' % old_ctx_name)
+        saved_ctx = frame.eval_ctx.save()
+        self.writeline(f"{old_ctx_name} = context.eval_ctx.save()")
         self.visit_EvalContextModifier(node, frame)
         for child in node.body:
             self.visit(child, frame)
-        frame.eval_ctx.revert(safed_ctx)
-        self.writeline('context.eval_ctx.revert(%s)' % old_ctx_name)
+        frame.eval_ctx.revert(saved_ctx)
+        self.writeline(f"context.eval_ctx.revert({old_ctx_name})")

constants.py

diff --git a/constants.py b/constants.py
index cab203c..41a1c23 100644
--- a/constants.py
+++ b/constants.py
@@ -1,17 +1,5 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja.constants
-    ~~~~~~~~~~~~~~~
-
-    Various constants.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-
-
 #: list of lorem ipsum words used by the lipsum() helper function
-LOREM_IPSUM_WORDS = u'''\
+LOREM_IPSUM_WORDS = """\
 a ac accumsan ad adipiscing aenean aliquam aliquet amet ante aptent arcu at
 auctor augue bibendum blandit class commodo condimentum congue consectetuer
 consequat conubia convallis cras cubilia cum curabitur curae cursus dapibus
@@ -29,4 +17,4 @@
 sociis sociosqu sodales sollicitudin suscipit suspendisse taciti tellus tempor
 tempus tincidunt torquent tortor tristique turpis ullamcorper ultrices
 ultricies urna ut varius vehicula vel velit venenatis vestibulum vitae vivamus
-viverra volutpat vulputate'''
+viverra volutpat vulputate"""

debug.py

diff --git a/debug.py b/debug.py
index 815cc18..7ed7e92 100644
--- a/debug.py
+++ b/debug.py
@@ -1,337 +1,191 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.debug
-    ~~~~~~~~~~~~
-
-    Implements the debug interface for Jinja.  This module does some pretty
-    ugly stuff with the Python traceback system in order to achieve tracebacks
-    with correct line numbers, locals and contents.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
 import sys
-import traceback
+import typing as t
+from types import CodeType
 from types import TracebackType
-from jinja2.utils import missing, internal_code
-from jinja2.exceptions import TemplateSyntaxError
-from jinja2._compat import iteritems, reraise, code_type
 
-# on pypy we can take advantage of transparent proxies
-try:
-    from __pypy__ import tproxy
-except ImportError:
-    tproxy = None
+from .exceptions import TemplateSyntaxError
+from .utils import internal_code
+from .utils import missing
+
+if t.TYPE_CHECKING:
+    from .runtime import Context
 
 
-# how does the raise helper look like?
-try:
-    exec("raise TypeError, 'foo'")
-except SyntaxError:
-    raise_helper = 'raise __jinja_exception__[1]'
-except TypeError:
-    raise_helper = 'raise __jinja_exception__[0], __jinja_exception__[1]'
+def rewrite_traceback_stack(source: t.Optional[str] = None) -> BaseException:
+    """Rewrite the current exception to replace any tracebacks from
+    within compiled template code with tracebacks that look like they
+    came from the template source.
 
+    This must be called within an ``except`` block.
 
-class TracebackFrameProxy(object):
-    """Proxies a traceback frame."""
-
-    def __init__(self, tb):
-        self.tb = tb
-        self._tb_next = None
-
-    @property
-    def tb_next(self):
-        return self._tb_next
-
-    def set_next(self, next):
-        if tb_set_next is not None:
-            try:
-                tb_set_next(self.tb, next and next.tb or None)
-            except Exception:
-                # this function can fail due to all the hackery it does
-                # on various python implementations.  We just catch errors
-                # down and ignore them if necessary.
-                pass
-        self._tb_next = next
-
-    @property
-    def is_jinja_frame(self):
-        return '__jinja_template__' in self.tb.tb_frame.f_globals
-
-    def __getattr__(self, name):
-        return getattr(self.tb, name)
-
-
-def make_frame_proxy(frame):
-    proxy = TracebackFrameProxy(frame)
-    if tproxy is None:
-        return proxy
-    def operation_handler(operation, *args, **kwargs):
-        if operation in ('__getattribute__', '__getattr__'):
-            return getattr(proxy, args[0])
-        elif operation == '__setattr__':
-            proxy.__setattr__(*args, **kwargs)
-        else:
-            return getattr(proxy, operation)(*args, **kwargs)
-    return tproxy(TracebackType, operation_handler)
-
-
-class ProcessedTraceback(object):
-    """Holds a Jinja preprocessed traceback for printing or reraising."""
-
-    def __init__(self, exc_type, exc_value, frames):
-        assert frames, 'no frames for this traceback?'
-        self.exc_type = exc_type
-        self.exc_value = exc_value
-        self.frames = frames
-
-        # newly concatenate the frames (which are proxies)
-        prev_tb = None
-        for tb in self.frames:
-            if prev_tb is not None:
-                prev_tb.set_next(tb)
-            prev_tb = tb
-        prev_tb.set_next(None)
-
-    def render_as_text(self, limit=None):
-        """Return a string with the traceback."""
-        lines = traceback.format_exception(self.exc_type, self.exc_value,
-                                           self.frames[0], limit=limit)
-        return ''.join(lines).rstrip()
-
-    def render_as_html(self, full=False):
-        """Return a unicode string with the traceback as rendered HTML."""
-        from jinja2.debugrenderer import render_traceback
-        return u'%s\n\n<!--\n%s\n-->' % (
-            render_traceback(self, full=full),
-            self.render_as_text().decode('utf-8', 'replace')
-        )
-
-    @property
-    def is_template_syntax_error(self):
-        """`True` if this is a template syntax error."""
-        return isinstance(self.exc_value, TemplateSyntaxError)
-
-    @property
-    def exc_info(self):
-        """Exception info tuple with a proxy around the frame objects."""
-        return self.exc_type, self.exc_value, self.frames[0]
-
-    @property
-    def standard_exc_info(self):
-        """Standard python exc_info for re-raising"""
-        tb = self.frames[0]
-        # the frame will be an actual traceback (or transparent proxy) if
-        # we are on pypy or a python implementation with support for tproxy
-        if type(tb) is not TracebackType:
-            tb = tb.tb
-        return self.exc_type, self.exc_value, tb
-
-
-def make_traceback(exc_info, source_hint=None):
-    """Creates a processed traceback object from the exc_info."""
-    exc_type, exc_value, tb = exc_info
-    if isinstance(exc_value, TemplateSyntaxError):
-        exc_info = translate_syntax_error(exc_value, source_hint)
-        initial_skip = 0
-    else:
-        initial_skip = 1
-    return translate_exception(exc_info, initial_skip)
-
-
-def translate_syntax_error(error, source=None):
-    """Rewrites a syntax error to please traceback systems."""
-    error.source = source
-    error.translated = True
-    exc_info = (error.__class__, error, None)
-    filename = error.filename
-    if filename is None:
-        filename = '<unknown>'
-    return fake_exc_info(exc_info, filename, error.lineno)
-
-
-def translate_exception(exc_info, initial_skip=0):
-    """If passed an exc_info it will automatically rewrite the exceptions
-    all the way down to the correct line numbers and frames.
+    :param source: For ``TemplateSyntaxError``, the original source if
+        known.
+    :return: The original exception with the rewritten traceback.
     """
-    tb = exc_info[2]
-    frames = []
+    _, exc_value, tb = sys.exc_info()
+    exc_value = t.cast(BaseException, exc_value)
+    tb = t.cast(TracebackType, tb)
 
-    # skip some internal frames if wanted
-    for x in range(initial_skip):
-        if tb is not None:
-            tb = tb.tb_next
-    initial_tb = tb
+    if isinstance(exc_value, TemplateSyntaxError) and not exc_value.translated:
+        exc_value.translated = True
+        exc_value.source = source
+        # Remove the old traceback, otherwise the frames from the
+        # compiler still show up.
+        exc_value.with_traceback(None)
+        # Outside of runtime, so the frame isn't executing template
+        # code, but it still needs to point at the template.
+        tb = fake_traceback(
+            exc_value, None, exc_value.filename or "<unknown>", exc_value.lineno
+        )
+    else:
+        # Skip the frame for the render function.
+        tb = tb.tb_next
 
+    stack = []
+
+    # Build the stack of traceback object, replacing any in template
+    # code with the source file and line information.
     while tb is not None:
-        # skip frames decorated with @internalcode.  These are internal
-        # calls we can't avoid and that are useless in template debugging
-        # output.
+        # Skip frames decorated with @internalcode. These are internal
+        # calls that aren't useful in template debugging output.
         if tb.tb_frame.f_code in internal_code:
             tb = tb.tb_next
             continue
 
-        # save a reference to the next frame if we override the current
-        # one with a faked one.
-        next = tb.tb_next
+        template = tb.tb_frame.f_globals.get("__jinja_template__")
 
-        # fake template exceptions
-        template = tb.tb_frame.f_globals.get('__jinja_template__')
         if template is not None:
             lineno = template.get_corresponding_lineno(tb.tb_lineno)
-            tb = fake_exc_info(exc_info[:2] + (tb,), template.filename,
-                               lineno)[2]
-
-        frames.append(make_frame_proxy(tb))
-        tb = next
-
-    # if we don't have any exceptions in the frames left, we have to
-    # reraise it unchanged.
-    # XXX: can we backup here?  when could this happen?
-    if not frames:
-        reraise(exc_info[0], exc_info[1], exc_info[2])
-
-    return ProcessedTraceback(exc_info[0], exc_info[1], frames)
-
-
-def fake_exc_info(exc_info, filename, lineno):
-    """Helper for `translate_exception`."""
-    exc_type, exc_value, tb = exc_info
-
-    # figure the real context out
-    if tb is not None:
-        real_locals = tb.tb_frame.f_locals.copy()
-        ctx = real_locals.get('context')
-        if ctx:
-            locals = ctx.get_all()
+            fake_tb = fake_traceback(exc_value, tb, template.filename, lineno)
+            stack.append(fake_tb)
         else:
-            locals = {}
-        for name, value in iteritems(real_locals):
-            if name.startswith('l_') and value is not missing:
-                locals[name[2:]] = value
+            stack.append(tb)
 
-        # if there is a local called __jinja_exception__, we get
-        # rid of it to not break the debug functionality.
-        locals.pop('__jinja_exception__', None)
+        tb = tb.tb_next
+
+    tb_next = None
+
+    # Assign tb_next in reverse to avoid circular references.
+    for tb in reversed(stack):
+        tb.tb_next = tb_next
+        tb_next = tb
+
+    return exc_value.with_traceback(tb_next)
+
+
+def fake_traceback(  # type: ignore
+    exc_value: BaseException, tb: t.Optional[TracebackType], filename: str, lineno: int
+) -> TracebackType:
+    """Produce a new traceback object that looks like it came from the
+    template source instead of the compiled code. The filename, line
+    number, and location name will point to the template, and the local
+    variables will be the current template context.
+
+    :param exc_value: The original exception to be re-raised to create
+        the new traceback.
+    :param tb: The original traceback to get the local variables and
+        code info from.
+    :param filename: The template filename.
+    :param lineno: The line number in the template source.
+    """
+    if tb is not None:
+        # Replace the real locals with the context that would be
+        # available at that point in the template.
+        locals = get_template_locals(tb.tb_frame.f_locals)
+        locals.pop("__jinja_exception__", None)
     else:
         locals = {}
 
-    # assamble fake globals we need
     globals = {
-        '__name__':             filename,
-        '__file__':             filename,
-        '__jinja_exception__':  exc_info[:2],
-
-        # we don't want to keep the reference to the template around
-        # to not cause circular dependencies, but we mark it as Jinja
-        # frame for the ProcessedTraceback
-        '__jinja_template__':   None
+        "__name__": filename,
+        "__file__": filename,
+        "__jinja_exception__": exc_value,
     }
+    # Raise an exception at the correct line number.
+    code: CodeType = compile(
+        "\n" * (lineno - 1) + "raise __jinja_exception__", filename, "exec"
+    )
 
-    # and fake the exception
-    code = compile('\n' * (lineno - 1) + raise_helper, filename, 'exec')
+    # Build a new code object that points to the template file and
+    # replaces the location with a block name.
+    location = "template"
 
-    # if it's possible, change the name of the code.  This won't work
-    # on some python environments such as google appengine
-    try:
-        if tb is None:
-            location = 'template'
-        else:
-            function = tb.tb_frame.f_code.co_name
-            if function == 'root':
-                location = 'top-level template code'
-            elif function.startswith('block_'):
-                location = 'block "%s"' % function[6:]
-            else:
-                location = 'template'
-        code = code_type(0, code.co_nlocals, code.co_stacksize,
-                         code.co_flags, code.co_code, code.co_consts,
-                         code.co_names, code.co_varnames, filename,
-                         location, code.co_firstlineno,
-                         code.co_lnotab, (), ())
-    except:
-        pass
+    if tb is not None:
+        function = tb.tb_frame.f_code.co_name
 
-    # execute the code and catch the new traceback
+        if function == "root":
+            location = "top-level template code"
+        elif function.startswith("block_"):
+            location = f"block {function[6:]!r}"
+
+    if sys.version_info >= (3, 8):
+        code = code.replace(co_name=location)
+    else:
+        code = CodeType(
+            code.co_argcount,
+            code.co_kwonlyargcount,
+            code.co_nlocals,
+            code.co_stacksize,
+            code.co_flags,
+            code.co_code,
+            code.co_consts,
+            code.co_names,
+            code.co_varnames,
+            code.co_filename,
+            location,
+            code.co_firstlineno,
+            code.co_lnotab,
+            code.co_freevars,
+            code.co_cellvars,
+        )
+
+    # Execute the new code, which is guaranteed to raise, and return
+    # the new traceback without this frame.
     try:
         exec(code, globals, locals)
-    except:
-        exc_info = sys.exc_info()
-        new_tb = exc_info[2].tb_next
-
-    # return without this frame
-    return exc_info[:2] + (new_tb,)
+    except BaseException:
+        return sys.exc_info()[2].tb_next  # type: ignore
 
 
-def _init_ugly_crap():
-    """This function implements a few ugly things so that we can patch the
-    traceback objects.  The function returned allows resetting `tb_next` on
-    any python traceback object.  Do not attempt to use this on non cpython
-    interpreters
+def get_template_locals(real_locals: t.Mapping[str, t.Any]) -> t.Dict[str, t.Any]:
+    """Based on the runtime locals, get the context that would be
+    available at that point in the template.
     """
-    import ctypes
-    from types import TracebackType
+    # Start with the current template context.
+    ctx: "t.Optional[Context]" = real_locals.get("context")
 
-    # figure out side of _Py_ssize_t
-    if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'):
-        _Py_ssize_t = ctypes.c_int64
+    if ctx is not None:
+        data: t.Dict[str, t.Any] = ctx.get_all().copy()
     else:
-        _Py_ssize_t = ctypes.c_int
+        data = {}
 
-    # regular python
-    class _PyObject(ctypes.Structure):
-        pass
-    _PyObject._fields_ = [
-        ('ob_refcnt', _Py_ssize_t),
-        ('ob_type', ctypes.POINTER(_PyObject))
-    ]
+    # Might be in a derived context that only sets local variables
+    # rather than pushing a context. Local variables follow the scheme
+    # l_depth_name. Find the highest-depth local that has a value for
+    # each name.
+    local_overrides: t.Dict[str, t.Tuple[int, t.Any]] = {}
 
-    # python with trace
-    if hasattr(sys, 'getobjects'):
-        class _PyObject(ctypes.Structure):
-            pass
-        _PyObject._fields_ = [
-            ('_ob_next', ctypes.POINTER(_PyObject)),
-            ('_ob_prev', ctypes.POINTER(_PyObject)),
-            ('ob_refcnt', _Py_ssize_t),
-            ('ob_type', ctypes.POINTER(_PyObject))
-        ]
+    for name, value in real_locals.items():
+        if not name.startswith("l_") or value is missing:
+            # Not a template variable, or no longer relevant.
+            continue
 
-    class _Traceback(_PyObject):
-        pass
-    _Traceback._fields_ = [
-        ('tb_next', ctypes.POINTER(_Traceback)),
-        ('tb_frame', ctypes.POINTER(_PyObject)),
-        ('tb_lasti', ctypes.c_int),
-        ('tb_lineno', ctypes.c_int)
-    ]
+        try:
+            _, depth_str, name = name.split("_", 2)
+            depth = int(depth_str)
+        except ValueError:
+            continue
 
-    def tb_set_next(tb, next):
-        """Set the tb_next attribute of a traceback object."""
-        if not (isinstance(tb, TracebackType) and
-                (next is None or isinstance(next, TracebackType))):
-            raise TypeError('tb_set_next arguments must be traceback objects')
-        obj = _Traceback.from_address(id(tb))
-        if tb.tb_next is not None:
-            old = _Traceback.from_address(id(tb.tb_next))
-            old.ob_refcnt -= 1
-        if next is None:
-            obj.tb_next = ctypes.POINTER(_Traceback)()
+        cur_depth = local_overrides.get(name, (-1,))[0]
+
+        if cur_depth < depth:
+            local_overrides[name] = (depth, value)
+
+    # Modify the context with any derived context.
+    for name, (_, value) in local_overrides.items():
+        if value is missing:
+            data.pop(name, None)
         else:
-            next = _Traceback.from_address(id(next))
-            next.ob_refcnt += 1
-            obj.tb_next = ctypes.pointer(next)
+            data[name] = value
 
-    return tb_set_next
-
-
-# try to get a tb_set_next implementation if we don't have transparent
-# proxies.
-tb_set_next = None
-if tproxy is None:
-    try:
-        tb_set_next = _init_ugly_crap()
-    except:
-        pass
-    del _init_ugly_crap
+    return data

defaults.py

diff --git a/defaults.py b/defaults.py
index a27cb80..638cad3 100644
--- a/defaults.py
+++ b/defaults.py
@@ -1,43 +1,48 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.defaults
-    ~~~~~~~~~~~~~~~
+import typing as t
 
-    Jinja default filters and tags.
+from .filters import FILTERS as DEFAULT_FILTERS  # noqa: F401
+from .tests import TESTS as DEFAULT_TESTS  # noqa: F401
+from .utils import Cycler
+from .utils import generate_lorem_ipsum
+from .utils import Joiner
+from .utils import Namespace
 
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2._compat import range_type
-from jinja2.utils import generate_lorem_ipsum, Cycler, Joiner
-
+if t.TYPE_CHECKING:
+    import typing_extensions as te
 
 # defaults for the parser / lexer
-BLOCK_START_STRING = '{%'
-BLOCK_END_STRING = '%}'
-VARIABLE_START_STRING = '{{'
-VARIABLE_END_STRING = '}}'
-COMMENT_START_STRING = '{#'
-COMMENT_END_STRING = '#}'
-LINE_STATEMENT_PREFIX = None
-LINE_COMMENT_PREFIX = None
+BLOCK_START_STRING = "{%"
+BLOCK_END_STRING = "%}"
+VARIABLE_START_STRING = "{{"
+VARIABLE_END_STRING = "}}"
+COMMENT_START_STRING = "{#"
+COMMENT_END_STRING = "#}"
+LINE_STATEMENT_PREFIX: t.Optional[str] = None
+LINE_COMMENT_PREFIX: t.Optional[str] = None
 TRIM_BLOCKS = False
 LSTRIP_BLOCKS = False
-NEWLINE_SEQUENCE = '\n'
+NEWLINE_SEQUENCE: "te.Literal['\\n', '\\r\\n', '\\r']" = "\n"
 KEEP_TRAILING_NEWLINE = False
 
-
 # default filters, tests and namespace
-from jinja2.filters import FILTERS as DEFAULT_FILTERS
-from jinja2.tests import TESTS as DEFAULT_TESTS
+
 DEFAULT_NAMESPACE = {
-    'range':        range_type,
-    'dict':         lambda **kw: kw,
-    'lipsum':       generate_lorem_ipsum,
-    'cycler':       Cycler,
-    'joiner':       Joiner
+    "range": range,
+    "dict": dict,
+    "lipsum": generate_lorem_ipsum,
+    "cycler": Cycler,
+    "joiner": Joiner,
+    "namespace": Namespace,
 }
 
-
-# export all constants
-__all__ = tuple(x for x in locals().keys() if x.isupper())
+# default policies
+DEFAULT_POLICIES: t.Dict[str, t.Any] = {
+    "compiler.ascii_str": True,
+    "urlize.rel": "noopener",
+    "urlize.target": None,
+    "urlize.extra_schemes": None,
+    "truncate.leeway": 5,
+    "json.dumps_function": None,
+    "json.dumps_kwargs": {"sort_keys": True},
+    "ext.i18n.trimmed": False,
+}

environment.py

diff --git a/environment.py b/environment.py
index 45fabad..ea04e8b 100644
--- a/environment.py
+++ b/environment.py
@@ -1,106 +1,145 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.environment
-    ~~~~~~~~~~~~~~~~~~
-
-    Provides a class that holds runtime and parsing time options.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
+"""Classes for managing templates and their runtime and compile time
+options.
 """
 import os
-import sys
-from jinja2 import nodes
-from jinja2.defaults import BLOCK_START_STRING, \
-     BLOCK_END_STRING, VARIABLE_START_STRING, VARIABLE_END_STRING, \
-     COMMENT_START_STRING, COMMENT_END_STRING, LINE_STATEMENT_PREFIX, \
-     LINE_COMMENT_PREFIX, TRIM_BLOCKS, NEWLINE_SEQUENCE, \
-     DEFAULT_FILTERS, DEFAULT_TESTS, DEFAULT_NAMESPACE, \
-     KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
-from jinja2.lexer import get_lexer, TokenStream
-from jinja2.parser import Parser
-from jinja2.nodes import EvalContext
-from jinja2.optimizer import optimize
-from jinja2.compiler import generate
-from jinja2.runtime import Undefined, new_context
-from jinja2.exceptions import TemplateSyntaxError, TemplateNotFound, \
-     TemplatesNotFound, TemplateRuntimeError
-from jinja2.utils import import_string, LRUCache, Markup, missing, \
-     concat, consume, internalcode
-from jinja2._compat import imap, ifilter, string_types, iteritems, \
-     text_type, reraise, implements_iterator, implements_to_string, \
-     get_next, encode_filename, PY2, PYPY
+import typing
+import typing as t
+import weakref
+from collections import ChainMap
+from functools import lru_cache
+from functools import partial
 from functools import reduce
+from types import CodeType
+
+from markupsafe import Markup
+
+from . import nodes
+from .compiler import CodeGenerator
+from .compiler import generate
+from .defaults import BLOCK_END_STRING
+from .defaults import BLOCK_START_STRING
+from .defaults import COMMENT_END_STRING
+from .defaults import COMMENT_START_STRING
+from .defaults import DEFAULT_FILTERS
+from .defaults import DEFAULT_NAMESPACE
+from .defaults import DEFAULT_POLICIES
+from .defaults import DEFAULT_TESTS
+from .defaults import KEEP_TRAILING_NEWLINE
+from .defaults import LINE_COMMENT_PREFIX
+from .defaults import LINE_STATEMENT_PREFIX
+from .defaults import LSTRIP_BLOCKS
+from .defaults import NEWLINE_SEQUENCE
+from .defaults import TRIM_BLOCKS
+from .defaults import VARIABLE_END_STRING
+from .defaults import VARIABLE_START_STRING
+from .exceptions import TemplateNotFound
+from .exceptions import TemplateRuntimeError
+from .exceptions import TemplatesNotFound
+from .exceptions import TemplateSyntaxError
+from .exceptions import UndefinedError
+from .lexer import get_lexer
+from .lexer import Lexer
+from .lexer import TokenStream
+from .nodes import EvalContext
+from .parser import Parser
+from .runtime import Context
+from .runtime import new_context
+from .runtime import Undefined
+from .utils import _PassArg
+from .utils import concat
+from .utils import consume
+from .utils import import_string
+from .utils import internalcode
+from .utils import LRUCache
+from .utils import missing
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .bccache import BytecodeCache
+    from .ext import Extension
+    from .loaders import BaseLoader
+
+_env_bound = t.TypeVar("_env_bound", bound="Environment")
 
 
 # for direct template usage we have up to ten living environments
-_spontaneous_environments = LRUCache(10)
+@lru_cache(maxsize=10)
+def get_spontaneous_environment(cls: t.Type[_env_bound], *args: t.Any) -> _env_bound:
+    """Return a new spontaneous environment. A spontaneous environment
+    is used for templates created directly rather than through an
+    existing environment.
 
-# the function to create jinja traceback objects.  This is dynamically
-# imported on the first exception in the exception handler.
-_make_traceback = None
-
-
-def get_spontaneous_environment(*args):
-    """Return a new spontaneous environment.  A spontaneous environment is an
-    unnamed and unaccessible (in theory) environment that is used for
-    templates generated from a string and not from the file system.
+    :param cls: Environment class to create.
+    :param args: Positional arguments passed to environment.
     """
-    try:
-        env = _spontaneous_environments.get(args)
-    except TypeError:
-        return Environment(*args)
-    if env is not None:
-        return env
-    _spontaneous_environments[args] = env = Environment(*args)
+    env = cls(*args)
     env.shared = True
     return env
 
 
-def create_cache(size):
+def create_cache(
+    size: int,
+) -> t.Optional[t.MutableMapping[t.Tuple[weakref.ref, str], "Template"]]:
     """Return the cache class for the given size."""
     if size == 0:
         return None
+
     if size < 0:
         return {}
-    return LRUCache(size)
+
+    return LRUCache(size)  # type: ignore
 
 
-def copy_cache(cache):
+def copy_cache(
+    cache: t.Optional[t.MutableMapping],
+) -> t.Optional[t.MutableMapping[t.Tuple[weakref.ref, str], "Template"]]:
     """Create an empty copy of the given cache."""
     if cache is None:
         return None
-    elif type(cache) is dict:
+
+    if type(cache) is dict:
         return {}
-    return LRUCache(cache.capacity)
+
+    return LRUCache(cache.capacity)  # type: ignore
 
 
-def load_extensions(environment, extensions):
+def load_extensions(
+    environment: "Environment",
+    extensions: t.Sequence[t.Union[str, t.Type["Extension"]]],
+) -> t.Dict[str, "Extension"]:
     """Load the extensions from the list and bind it to the environment.
-    Returns a dict of instantiated environments.
+    Returns a dict of instantiated extensions.
     """
     result = {}
+
     for extension in extensions:
-        if isinstance(extension, string_types):
-            extension = import_string(extension)
+        if isinstance(extension, str):
+            extension = t.cast(t.Type["Extension"], import_string(extension))
+
         result[extension.identifier] = extension(environment)
+
     return result
 
 
-def _environment_sanity_check(environment):
+def _environment_config_check(environment: "Environment") -> "Environment":
     """Perform a sanity check on the environment."""
-    assert issubclass(environment.undefined, Undefined), 'undefined must ' \
-           'be a subclass of undefined because filters depend on it.'
-    assert environment.block_start_string != \
-           environment.variable_start_string != \
-           environment.comment_start_string, 'block, variable and comment ' \
-           'start strings must be different'
-    assert environment.newline_sequence in ('\r', '\r\n', '\n'), \
-           'newline_sequence set to unknown line ending string.'
+    assert issubclass(
+        environment.undefined, Undefined
+    ), "'undefined' must be a subclass of 'jinja2.Undefined'."
+    assert (
+        environment.block_start_string
+        != environment.variable_start_string
+        != environment.comment_start_string
+    ), "block, variable and comment start strings must be different."
+    assert environment.newline_sequence in {
+        "\r",
+        "\r\n",
+        "\n",
+    }, "'newline_sequence' must be one of '\\n', '\\r\\n', or '\\r'."
     return environment
 
 
-class Environment(object):
+class Environment:
     r"""The core component of Jinja is the `Environment`.  It contains
     important shared variables like configuration, filters, tests,
     globals and others.  Instances of this class may be modified if
@@ -108,16 +147,16 @@
     Modifications on environments after the first template was loaded
     will lead to surprising effects and undefined behavior.
 
-    Here the possible initialization parameters:
+    Here are the possible initialization parameters:
 
         `block_start_string`
-            The string marking the begin of a block.  Defaults to ``'{%'``.
+            The string marking the beginning of a block.  Defaults to ``'{%'``.
 
         `block_end_string`
             The string marking the end of a block.  Defaults to ``'%}'``.
 
         `variable_start_string`
-            The string marking the begin of a print statement.
+            The string marking the beginning of a print statement.
             Defaults to ``'{{'``.
 
         `variable_end_string`
@@ -125,7 +164,7 @@
             ``'}}'``.
 
         `comment_start_string`
-            The string marking the begin of a comment.  Defaults to ``'{#'``.
+            The string marking the beginning of a comment.  Defaults to ``'{#'``.
 
         `comment_end_string`
             The string marking the end of a comment.  Defaults to ``'#}'``.
@@ -136,7 +175,7 @@
 
         `line_comment_prefix`
             If given and a string, this will be used as prefix for line based
-            based comments.  See also :ref:`line-statements`.
+            comments.  See also :ref:`line-statements`.
 
             .. versionadded:: 2.2
 
@@ -167,7 +206,7 @@
             look at :ref:`the extensions documentation <jinja-extensions>`.
 
         `optimized`
-            should the optimizer be enabled?  Default is `True`.
+            should the optimizer be enabled?  Default is ``True``.
 
         `undefined`
             :class:`Undefined` or a subclass of it that is used to represent
@@ -176,14 +215,14 @@
         `finalize`
             A callable that can be used to process the result of a variable
             expression before it is output.  For example one can convert
-            `None` implicitly into an empty string here.
+            ``None`` implicitly into an empty string here.
 
         `autoescape`
-            If set to true the XML/HTML autoescaping feature is enabled by
-            default.  For more details about auto escaping see
-            :class:`~jinja2.utils.Markup`.  As of Jinja 2.4 this can also
+            If set to ``True`` the XML/HTML autoescaping feature is enabled by
+            default.  For more details about autoescaping see
+            :class:`~markupsafe.Markup`.  As of Jinja 2.4 this can also
             be a callable that is passed the template name and has to
-            return `True` or `False` depending on autoescape should be
+            return ``True`` or ``False`` depending on autoescape should be
             enabled by default.
 
             .. versionchanged:: 2.4
@@ -193,16 +232,19 @@
             The template loader for this environment.
 
         `cache_size`
-            The size of the cache.  Per default this is ``50`` which means
-            that if more than 50 templates are loaded the loader will clean
+            The size of the cache.  Per default this is ``400`` which means
+            that if more than 400 templates are loaded the loader will clean
             out the least recently used template.  If the cache size is set to
             ``0`` templates are recompiled all the time, if the cache size is
             ``-1`` the cache will not be cleaned.
 
+            .. versionchanged:: 2.8
+               The cache size was increased to 400 from a low 50.
+
         `auto_reload`
             Some loaders load templates from locations where the template
             sources may change (ie: file system or database).  If
-            `auto_reload` is set to `True` (default) every time a template is
+            ``auto_reload`` is set to ``True`` (default) every time a template is
             requested the loader checks if the source changed and if yes, it
             will reload the template.  For higher performance it's possible to
             disable that.
@@ -213,6 +255,10 @@
             have to be parsed if they were not changed.
 
             See :ref:`bytecode-cache` for more information.
+
+        `enable_async`
+            If set to true this enables async template execution which
+            allows using async functions and generators.
     """
 
     #: if this environment is sandboxed.  Modifying this variable won't make
@@ -225,38 +271,49 @@
     overlayed = False
 
     #: the environment this environment is linked to if it is an overlay
-    linked_to = None
+    linked_to: t.Optional["Environment"] = None
 
     #: shared environments have this set to `True`.  A shared environment
     #: must not be modified
     shared = False
 
-    #: these are currently EXPERIMENTAL undocumented features.
-    exception_handler = None
-    exception_formatter = None
+    #: the class that is used for code generation.  See
+    #: :class:`~jinja2.compiler.CodeGenerator` for more information.
+    code_generator_class: t.Type["CodeGenerator"] = CodeGenerator
 
-    def __init__(self,
-                 block_start_string=BLOCK_START_STRING,
-                 block_end_string=BLOCK_END_STRING,
-                 variable_start_string=VARIABLE_START_STRING,
-                 variable_end_string=VARIABLE_END_STRING,
-                 comment_start_string=COMMENT_START_STRING,
-                 comment_end_string=COMMENT_END_STRING,
-                 line_statement_prefix=LINE_STATEMENT_PREFIX,
-                 line_comment_prefix=LINE_COMMENT_PREFIX,
-                 trim_blocks=TRIM_BLOCKS,
-                 lstrip_blocks=LSTRIP_BLOCKS,
-                 newline_sequence=NEWLINE_SEQUENCE,
-                 keep_trailing_newline=KEEP_TRAILING_NEWLINE,
-                 extensions=(),
-                 optimized=True,
-                 undefined=Undefined,
-                 finalize=None,
-                 autoescape=False,
-                 loader=None,
-                 cache_size=50,
-                 auto_reload=True,
-                 bytecode_cache=None):
+    concat = "".join
+
+    #: the context class that is used for templates.  See
+    #: :class:`~jinja2.runtime.Context` for more information.
+    context_class: t.Type[Context] = Context
+
+    template_class: t.Type["Template"]
+
+    def __init__(
+        self,
+        block_start_string: str = BLOCK_START_STRING,
+        block_end_string: str = BLOCK_END_STRING,
+        variable_start_string: str = VARIABLE_START_STRING,
+        variable_end_string: str = VARIABLE_END_STRING,
+        comment_start_string: str = COMMENT_START_STRING,
+        comment_end_string: str = COMMENT_END_STRING,
+        line_statement_prefix: t.Optional[str] = LINE_STATEMENT_PREFIX,
+        line_comment_prefix: t.Optional[str] = LINE_COMMENT_PREFIX,
+        trim_blocks: bool = TRIM_BLOCKS,
+        lstrip_blocks: bool = LSTRIP_BLOCKS,
+        newline_sequence: "te.Literal['\\n', '\\r\\n', '\\r']" = NEWLINE_SEQUENCE,
+        keep_trailing_newline: bool = KEEP_TRAILING_NEWLINE,
+        extensions: t.Sequence[t.Union[str, t.Type["Extension"]]] = (),
+        optimized: bool = True,
+        undefined: t.Type[Undefined] = Undefined,
+        finalize: t.Optional[t.Callable[..., t.Any]] = None,
+        autoescape: t.Union[bool, t.Callable[[t.Optional[str]], bool]] = False,
+        loader: t.Optional["BaseLoader"] = None,
+        cache_size: int = 400,
+        auto_reload: bool = True,
+        bytecode_cache: t.Optional["BytecodeCache"] = None,
+        enable_async: bool = False,
+    ):
         # !!Important notice!!
         #   The constructor accepts quite a few arguments that should be
         #   passed by keyword rather than position.  However it's important to
@@ -283,7 +340,7 @@
         self.keep_trailing_newline = keep_trailing_newline
 
         # runtime information
-        self.undefined = undefined
+        self.undefined: t.Type[Undefined] = undefined
         self.optimized = optimized
         self.finalize = finalize
         self.autoescape = autoescape
@@ -299,38 +356,58 @@
         self.bytecode_cache = bytecode_cache
         self.auto_reload = auto_reload
 
+        # configurable policies
+        self.policies = DEFAULT_POLICIES.copy()
+
         # load extensions
         self.extensions = load_extensions(self, extensions)
 
-        _environment_sanity_check(self)
+        self.is_async = enable_async
+        _environment_config_check(self)
 
-    def add_extension(self, extension):
+    def add_extension(self, extension: t.Union[str, t.Type["Extension"]]) -> None:
         """Adds an extension after the environment was created.
 
         .. versionadded:: 2.5
         """
         self.extensions.update(load_extensions(self, [extension]))
 
-    def extend(self, **attributes):
+    def extend(self, **attributes: t.Any) -> None:
         """Add the items to the instance of the environment if they do not exist
         yet.  This is used by :ref:`extensions <writing-extensions>` to register
         callbacks and configuration values without breaking inheritance.
         """
-        for key, value in iteritems(attributes):
+        for key, value in attributes.items():
             if not hasattr(self, key):
                 setattr(self, key, value)
 
-    def overlay(self, block_start_string=missing, block_end_string=missing,
-                variable_start_string=missing, variable_end_string=missing,
-                comment_start_string=missing, comment_end_string=missing,
-                line_statement_prefix=missing, line_comment_prefix=missing,
-                trim_blocks=missing, lstrip_blocks=missing,
-                extensions=missing, optimized=missing,
-                undefined=missing, finalize=missing, autoescape=missing,
-                loader=missing, cache_size=missing, auto_reload=missing,
-                bytecode_cache=missing):
+    def overlay(
+        self,
+        block_start_string: str = missing,
+        block_end_string: str = missing,
+        variable_start_string: str = missing,
+        variable_end_string: str = missing,
+        comment_start_string: str = missing,
+        comment_end_string: str = missing,
+        line_statement_prefix: t.Optional[str] = missing,
+        line_comment_prefix: t.Optional[str] = missing,
+        trim_blocks: bool = missing,
+        lstrip_blocks: bool = missing,
+        newline_sequence: "te.Literal['\\n', '\\r\\n', '\\r']" = missing,
+        keep_trailing_newline: bool = missing,
+        extensions: t.Sequence[t.Union[str, t.Type["Extension"]]] = missing,
+        optimized: bool = missing,
+        undefined: t.Type[Undefined] = missing,
+        finalize: t.Optional[t.Callable[..., t.Any]] = missing,
+        autoescape: t.Union[bool, t.Callable[[t.Optional[str]], bool]] = missing,
+        loader: t.Optional["BaseLoader"] = missing,
+        cache_size: int = missing,
+        auto_reload: bool = missing,
+        bytecode_cache: t.Optional["BytecodeCache"] = missing,
+        enable_async: bool = False,
+    ) -> "Environment":
         """Create a new overlay environment that shares all the data with the
-        current environment except of cache and the overridden attributes.
+        current environment except for cache and the overridden attributes.
         Extensions cannot be removed for an overlayed environment.  An overlayed
         environment automatically gets all the extensions of the environment it
         is linked to plus optional extra extensions.
@@ -339,16 +416,20 @@
         up completely.  Not all attributes are truly linked, some are just
         copied over so modifications on the original environment may not shine
         through.
+
+        .. versionchanged:: 3.1.2
+            Added the ``newline_sequence``,, ``keep_trailing_newline``,
+            and ``enable_async`` parameters to match ``__init__``.
         """
         args = dict(locals())
-        del args['self'], args['cache_size'], args['extensions']
+        del args["self"], args["cache_size"], args["extensions"], args["enable_async"]
 
         rv = object.__new__(self.__class__)
         rv.__dict__.update(self.__dict__)
         rv.overlayed = True
         rv.linked_to = self
 
-        for key, value in iteritems(args):
+        for key, value in args.items():
             if value is not missing:
                 setattr(rv, key, value)
 
@@ -358,26 +439,33 @@
             rv.cache = copy_cache(self.cache)
 
         rv.extensions = {}
-        for key, value in iteritems(self.extensions):
+        for key, value in self.extensions.items():
             rv.extensions[key] = value.bind(rv)
         if extensions is not missing:
             rv.extensions.update(load_extensions(rv, extensions))
 
-        return _environment_sanity_check(rv)
+        if enable_async is not missing:
+            rv.is_async = enable_async
 
-    lexer = property(get_lexer, doc="The lexer for this environment.")
+        return _environment_config_check(rv)
 
-    def iter_extensions(self):
+    @property
+    def lexer(self) -> Lexer:
+        """The lexer for this environment."""
+        return get_lexer(self)
+
+    def iter_extensions(self) -> t.Iterator["Extension"]:
         """Iterates over the extensions by priority."""
-        return iter(sorted(self.extensions.values(),
-                           key=lambda x: x.priority))
+        return iter(sorted(self.extensions.values(), key=lambda x: x.priority))
 
-    def getitem(self, obj, argument):
+    def getitem(
+        self, obj: t.Any, argument: t.Union[str, t.Any]
+    ) -> t.Union[t.Any, Undefined]:
         """Get an item or attribute of an object but prefer the item."""
         try:
             return obj[argument]
-        except (TypeError, LookupError):
-            if isinstance(argument, string_types):
+        except (AttributeError, TypeError, LookupError):
+            if isinstance(argument, str):
                 try:
                     attr = str(argument)
                 except Exception:
@@ -389,9 +477,9 @@
                         pass
             return self.undefined(obj=obj, name=argument)
 
-    def getattr(self, obj, attribute):
+    def getattr(self, obj: t.Any, attribute: str) -> t.Any:
         """Get an item or attribute of an object but prefer the attribute.
-        Unlike :meth:`getitem` the attribute *must* be a bytestring.
+        Unlike :meth:`getitem` the attribute *must* be a string.
         """
         try:
             return getattr(obj, attribute)
@@ -402,63 +490,138 @@
         except (TypeError, LookupError, AttributeError):
             return self.undefined(obj=obj, name=attribute)
 
-    def call_filter(self, name, value, args=None, kwargs=None,
-                    context=None, eval_ctx=None):
-        """Invokes a filter on a value the same way the compiler does it.
+    def _filter_test_common(
+        self,
+        name: t.Union[str, Undefined],
+        value: t.Any,
+        args: t.Optional[t.Sequence[t.Any]],
+        kwargs: t.Optional[t.Mapping[str, t.Any]],
+        context: t.Optional[Context],
+        eval_ctx: t.Optional[EvalContext],
+        is_filter: bool,
+    ) -> t.Any:
+        if is_filter:
+            env_map = self.filters
+            type_name = "filter"
+        else:
+            env_map = self.tests
+            type_name = "test"
 
-        .. versionadded:: 2.7
-        """
-        func = self.filters.get(name)
+        func = env_map.get(name)  # type: ignore
+
         if func is None:
-            raise TemplateRuntimeError('no filter named %r' % name)
-        args = [value] + list(args or ())
-        if getattr(func, 'contextfilter', False):
+            msg = f"No {type_name} named {name!r}."
+
+            if isinstance(name, Undefined):
+                try:
+                    name._fail_with_undefined_error()
+                except Exception as e:
+                    msg = f"{msg} ({e}; did you forget to quote the callable name?)"
+
+            raise TemplateRuntimeError(msg)
+
+        args = [value, *(args if args is not None else ())]
+        kwargs = kwargs if kwargs is not None else {}
+        pass_arg = _PassArg.from_obj(func)
+
+        if pass_arg is _PassArg.context:
             if context is None:
-                raise TemplateRuntimeError('Attempted to invoke context '
-                                           'filter without context')
+                raise TemplateRuntimeError(
+                    f"Attempted to invoke a context {type_name} without context."
+                )
+
             args.insert(0, context)
-        elif getattr(func, 'evalcontextfilter', False):
+        elif pass_arg is _PassArg.eval_context:
             if eval_ctx is None:
                 if context is not None:
                     eval_ctx = context.eval_ctx
                 else:
                     eval_ctx = EvalContext(self)
-            args.insert(0, eval_ctx)
-        elif getattr(func, 'environmentfilter', False):
-            args.insert(0, self)
-        return func(*args, **(kwargs or {}))
 
-    def call_test(self, name, value, args=None, kwargs=None):
-        """Invokes a test on a value the same way the compiler does it.
+            args.insert(0, eval_ctx)
+        elif pass_arg is _PassArg.environment:
+            args.insert(0, self)
+
+        return func(*args, **kwargs)
+
+    def call_filter(
+        self,
+        name: str,
+        value: t.Any,
+        args: t.Optional[t.Sequence[t.Any]] = None,
+        kwargs: t.Optional[t.Mapping[str, t.Any]] = None,
+        context: t.Optional[Context] = None,
+        eval_ctx: t.Optional[EvalContext] = None,
+    ) -> t.Any:
+        """Invoke a filter on a value the same way the compiler does.
+
+        This might return a coroutine if the filter is running from an
+        environment in async mode and the filter supports async
+        execution. It's your responsibility to await this if needed.
 
         .. versionadded:: 2.7
         """
-        func = self.tests.get(name)
-        if func is None:
-            raise TemplateRuntimeError('no test named %r' % name)
-        return func(value, *(args or ()), **(kwargs or {}))
+        return self._filter_test_common(
+            name, value, args, kwargs, context, eval_ctx, True
+        )
+
+    def call_test(
+        self,
+        name: str,
+        value: t.Any,
+        args: t.Optional[t.Sequence[t.Any]] = None,
+        kwargs: t.Optional[t.Mapping[str, t.Any]] = None,
+        context: t.Optional[Context] = None,
+        eval_ctx: t.Optional[EvalContext] = None,
+    ) -> t.Any:
+        """Invoke a test on a value the same way the compiler does.
+
+        This might return a coroutine if the test is running from an
+        environment in async mode and the test supports async execution.
+        It's your responsibility to await this if needed.
+
+        .. versionchanged:: 3.0
+            Tests support ``@pass_context``, etc. decorators. Added
+            the ``context`` and ``eval_ctx`` parameters.
+
+        .. versionadded:: 2.7
+        """
+        return self._filter_test_common(
+            name, value, args, kwargs, context, eval_ctx, False
+        )
 
     @internalcode
-    def parse(self, source, name=None, filename=None):
+    def parse(
+        self,
+        source: str,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+    ) -> nodes.Template:
         """Parse the sourcecode and return the abstract syntax tree.  This
         tree of nodes is used by the compiler to convert the template into
         executable source- or bytecode.  This is useful for debugging or to
         extract information from templates.
 
-        If you are :ref:`developing Jinja2 extensions <writing-extensions>`
+        If you are :ref:`developing Jinja extensions <writing-extensions>`
         this gives you a good overview of the node tree generated.
         """
         try:
             return self._parse(source, name, filename)
         except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        self.handle_exception(exc_info, source_hint=source)
+            self.handle_exception(source=source)
 
-    def _parse(self, source, name, filename):
+    def _parse(
+        self, source: str, name: t.Optional[str], filename: t.Optional[str]
+    ) -> nodes.Template:
         """Internal parsing function used by `parse` and `compile`."""
-        return Parser(self, source, name, encode_filename(filename)).parse()
+        return Parser(self, source, name, filename).parse()
 
-    def lex(self, source, name=None, filename=None):
+    def lex(
+        self,
+        source: str,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+    ) -> t.Iterator[t.Tuple[int, str, str]]:
         """Lex the given sourcecode and return a generator that yields
         tokens as tuples in the form ``(lineno, token_type, value)``.
         This can be useful for :ref:`extension development <writing-extensions>`
@@ -468,52 +631,109 @@
         of the extensions to be applied you have to filter source through
         the :meth:`preprocess` method.
         """
-        source = text_type(source)
+        source = str(source)
         try:
             return self.lexer.tokeniter(source, name, filename)
         except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        self.handle_exception(exc_info, source_hint=source)
+            self.handle_exception(source=source)
 
-    def preprocess(self, source, name=None, filename=None):
+    def preprocess(
+        self,
+        source: str,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+    ) -> str:
         """Preprocesses the source with all extensions.  This is automatically
         called for all parsing and compiling methods but *not* for :meth:`lex`
         because there you usually only want the actual source tokenized.
         """
-        return reduce(lambda s, e: e.preprocess(s, name, filename),
-                      self.iter_extensions(), text_type(source))
+        return reduce(
+            lambda s, e: e.preprocess(s, name, filename),
+            self.iter_extensions(),
+            str(source),
+        )
 
-    def _tokenize(self, source, name, filename=None, state=None):
+    def _tokenize(
+        self,
+        source: str,
+        name: t.Optional[str],
+        filename: t.Optional[str] = None,
+        state: t.Optional[str] = None,
+    ) -> TokenStream:
         """Called by the parser to do the preprocessing and filtering
         for all the extensions.  Returns a :class:`~jinja2.lexer.TokenStream`.
         """
         source = self.preprocess(source, name, filename)
         stream = self.lexer.tokenize(source, name, filename, state)
+
         for ext in self.iter_extensions():
-            stream = ext.filter_stream(stream)
+            stream = ext.filter_stream(stream)  # type: ignore
+
             if not isinstance(stream, TokenStream):
-                stream = TokenStream(stream, name, filename)
+                stream = TokenStream(stream, name, filename)  # type: ignore
+
         return stream
 
-    def _generate(self, source, name, filename, defer_init=False):
+    def _generate(
+        self,
+        source: nodes.Template,
+        name: t.Optional[str],
+        filename: t.Optional[str],
+        defer_init: bool = False,
+    ) -> str:
         """Internal hook that can be overridden to hook a different generate
         method in.
 
         .. versionadded:: 2.5
         """
-        return generate(source, self, name, filename, defer_init=defer_init)
+        return generate(  # type: ignore
+            source,
+            self,
+            name,
+            filename,
+            defer_init=defer_init,
+            optimized=self.optimized,
+        )
 
-    def _compile(self, source, filename):
+    def _compile(self, source: str, filename: str) -> CodeType:
         """Internal hook that can be overridden to hook a different compile
         method in.
 
         .. versionadded:: 2.5
         """
-        return compile(source, filename, 'exec')
+        return compile(source, filename, "exec")  # type: ignore
+
+    @typing.overload
+    def compile(  # type: ignore
+        self,
+        source: t.Union[str, nodes.Template],
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+        raw: "te.Literal[False]" = False,
+        defer_init: bool = False,
+    ) -> CodeType:
+        ...
+
+    @typing.overload
+    def compile(
+        self,
+        source: t.Union[str, nodes.Template],
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+        raw: "te.Literal[True]" = ...,
+        defer_init: bool = False,
+    ) -> str:
+        ...
 
     @internalcode
-    def compile(self, source, name=None, filename=None, raw=False,
-                defer_init=False):
+    def compile(
+        self,
+        source: t.Union[str, nodes.Template],
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+        raw: bool = False,
+        defer_init: bool = False,
+    ) -> t.Union[str, CodeType]:
         """Compile a node or template source code.  The `name` parameter is
         the load name of the template after it was joined using
         :meth:`join_path` if necessary, not the filename on the file system.
@@ -535,25 +755,21 @@
         """
         source_hint = None
         try:
-            if isinstance(source, string_types):
+            if isinstance(source, str):
                 source_hint = source
                 source = self._parse(source, name, filename)
-            if self.optimized:
-                source = optimize(source, self)
-            source = self._generate(source, name, filename,
-                                    defer_init=defer_init)
+            source = self._generate(source, name, filename, defer_init=defer_init)
             if raw:
                 return source
             if filename is None:
-                filename = '<template>'
-            else:
-                filename = encode_filename(filename)
+                filename = "<template>"
             return self._compile(source, filename)
         except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        self.handle_exception(exc_info, source_hint=source)
+            self.handle_exception(source=source_hint)
 
-    def compile_expression(self, source, undefined_to_none=True):
+    def compile_expression(
+        self, source: str, undefined_to_none: bool = True
+    ) -> "TemplateExpression":
         """A handy helper method that returns a callable that accepts keyword
         arguments that appear as variables in the expression.  If called it
         returns the result of the expression.
@@ -581,30 +797,34 @@
 
         .. versionadded:: 2.1
         """
-        parser = Parser(self, source, state='variable')
-        exc_info = None
+        parser = Parser(self, source, state="variable")
         try:
             expr = parser.parse_expression()
             if not parser.stream.eos:
-                raise TemplateSyntaxError('chunk after expression',
-                                          parser.stream.current.lineno,
-                                          None, None)
+                raise TemplateSyntaxError(
+                    "chunk after expression", parser.stream.current.lineno, None, None
+                )
             expr.set_environment(self)
         except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        if exc_info is not None:
-            self.handle_exception(exc_info, source_hint=source)
-        body = [nodes.Assign(nodes.Name('result', 'store'), expr, lineno=1)]
+            self.handle_exception(source=source)
+
+        body = [nodes.Assign(nodes.Name("result", "store"), expr, lineno=1)]
         template = self.from_string(nodes.Template(body, lineno=1))
         return TemplateExpression(template, undefined_to_none)
 
-    def compile_templates(self, target, extensions=None, filter_func=None,
-                          zip='deflated', log_function=None,
-                          ignore_errors=True, py_compile=False):
+    def compile_templates(
+        self,
+        target: t.Union[str, os.PathLike],
+        extensions: t.Optional[t.Collection[str]] = None,
+        filter_func: t.Optional[t.Callable[[str], bool]] = None,
+        zip: t.Optional[str] = "deflated",
+        log_function: t.Optional[t.Callable[[str], None]] = None,
+        ignore_errors: bool = True,
+    ) -> None:
         """Finds all the templates the loader can find, compiles them
         and stores them in `target`.  If `zip` is `None`, instead of in a
-        zipfile, the templates will be will be stored in a directory.
-        By default a deflate zip algorithm is used, to switch to
+        zipfile, the templates will be stored in a directory.
+        By default a deflate zip algorithm is used. To switch to
         the stored algorithm, `zip` can be set to ``'stored'``.
 
         `extensions` and `filter_func` are passed to :meth:`list_templates`.
@@ -616,53 +836,38 @@
         syntax errors to abort the compilation you can set `ignore_errors`
         to `False` and you will get an exception on syntax errors.
 
-        If `py_compile` is set to `True` .pyc files will be written to the
-        target instead of standard .py files.  This flag does not do anything
-        on pypy and Python 3 where pyc files are not picked up by itself and
-        don't give much benefit.
-
         .. versionadded:: 2.4
         """
-        from jinja2.loaders import ModuleLoader
+        from .loaders import ModuleLoader
 
         if log_function is None:
-            log_function = lambda x: None
 
-        if py_compile:
-            if not PY2 or PYPY:
-                from warnings import warn
-                warn(Warning('py_compile has no effect on pypy or Python 3'))
-                py_compile = False
-            else:
-                import imp, marshal
-                py_header = imp.get_magic() + \
-                    u'\xff\xff\xff\xff'.encode('iso-8859-15')
+            def log_function(x: str) -> None:
+                pass
 
-                # Python 3.3 added a source filesize to the header
-                if sys.version_info >= (3, 3):
-                    py_header += u'\x00\x00\x00\x00'.encode('iso-8859-15')
+        assert log_function is not None
+        assert self.loader is not None, "No loader configured."
 
-        def write_file(filename, data, mode):
+        def write_file(filename: str, data: str) -> None:
             if zip:
                 info = ZipInfo(filename)
                 info.external_attr = 0o755 << 16
                 zip_file.writestr(info, data)
             else:
-                f = open(os.path.join(target, filename), mode)
-                try:
-                    f.write(data)
-                finally:
-                    f.close()
+                with open(os.path.join(target, filename), "wb") as f:
+                    f.write(data.encode("utf8"))
 
         if zip is not None:
             from zipfile import ZipFile, ZipInfo, ZIP_DEFLATED, ZIP_STORED
-            zip_file = ZipFile(target, 'w', dict(deflated=ZIP_DEFLATED,
-                                                 stored=ZIP_STORED)[zip])
-            log_function('Compiling into Zip archive "%s"' % target)
+
+            zip_file = ZipFile(
+                target, "w", dict(deflated=ZIP_DEFLATED, stored=ZIP_STORED)[zip]
+            )
+            log_function(f"Compiling into Zip archive {target!r}")
         else:
             if not os.path.isdir(target):
                 os.makedirs(target)
-            log_function('Compiling into folder "%s"' % target)
+            log_function(f"Compiling into folder {target!r}")
 
         try:
             for name in self.list_templates(extensions, filter_func):
@@ -672,27 +877,24 @@
                 except TemplateSyntaxError as e:
                     if not ignore_errors:
                         raise
-                    log_function('Could not compile "%s": %s' % (name, e))
+                    log_function(f'Could not compile "{name}": {e}')
                     continue
 
                 filename = ModuleLoader.get_module_filename(name)
 
-                if py_compile:
-                    c = self._compile(code, encode_filename(filename))
-                    write_file(filename + 'c', py_header +
-                               marshal.dumps(c), 'wb')
-                    log_function('Byte-compiled "%s" as %s' %
-                                 (name, filename + 'c'))
-                else:
-                    write_file(filename, code, 'w')
-                    log_function('Compiled "%s" as %s' % (name, filename))
+                write_file(filename, code)
+                log_function(f'Compiled "{name}" as {filename}')
         finally:
             if zip:
                 zip_file.close()
 
-        log_function('Finished compiling templates')
+        log_function("Finished compiling templates")
 
-    def list_templates(self, extensions=None, filter_func=None):
+    def list_templates(
+        self,
+        extensions: t.Optional[t.Collection[str]] = None,
+        filter_func: t.Optional[t.Callable[[str], bool]] = None,
+    ) -> t.List[str]:
         """Returns a list of templates for this environment.  This requires
         that the loader supports the loader's
         :meth:`~BaseLoader.list_templates` method.
@@ -708,40 +910,32 @@
 
         .. versionadded:: 2.4
         """
-        x = self.loader.list_templates()
+        assert self.loader is not None, "No loader configured."
+        names = self.loader.list_templates()
+
         if extensions is not None:
             if filter_func is not None:
-                raise TypeError('either extensions or filter_func '
-                                'can be passed, but not both')
-            filter_func = lambda x: '.' in x and \
-                                    x.rsplit('.', 1)[1] in extensions
-        if filter_func is not None:
-            x = ifilter(filter_func, x)
-        return x
+                raise TypeError(
+                    "either extensions or filter_func can be passed, but not both"
+                )
 
-    def handle_exception(self, exc_info=None, rendered=False, source_hint=None):
+            def filter_func(x: str) -> bool:
+                return "." in x and x.rsplit(".", 1)[1] in extensions  # type: ignore
+
+        if filter_func is not None:
+            names = [name for name in names if filter_func(name)]
+
+        return names
+
+    def handle_exception(self, source: t.Optional[str] = None) -> "te.NoReturn":
         """Exception handling helper.  This is used internally to either raise
         rewritten exceptions or return a rendered traceback for the template.
         """
-        global _make_traceback
-        if exc_info is None:
-            exc_info = sys.exc_info()
+        from .debug import rewrite_traceback_stack
 
-        # the debugging module is imported when it's used for the first time.
-        # we're doing a lot of stuff there and for applications that do not
-        # get any exceptions in template rendering there is no need to load
-        # all of that.
-        if _make_traceback is None:
-            from jinja2.debug import make_traceback as _make_traceback
-        traceback = _make_traceback(exc_info, source_hint)
-        if rendered and self.exception_formatter is not None:
-            return self.exception_formatter(traceback)
-        if self.exception_handler is not None:
-            self.exception_handler(traceback)
-        exc_type, exc_value, tb = traceback.standard_exc_info
-        reraise(exc_type, exc_value, tb)
+        raise rewrite_traceback_stack(source=source)
 
-    def join_path(self, template, parent):
+    def join_path(self, template: str, parent: str) -> str:
         """Join a template with the parent.  By default all the lookups are
         relative to the loader root so this method returns the `template`
         parameter unchanged, but if the paths should be relative to the
@@ -754,58 +948,110 @@
         return template
 
     @internalcode
-    def _load_template(self, name, globals):
+    def _load_template(
+        self, name: str, globals: t.Optional[t.MutableMapping[str, t.Any]]
+    ) -> "Template":
         if self.loader is None:
-            raise TypeError('no loader for this environment specified')
+            raise TypeError("no loader for this environment specified")
+        cache_key = (weakref.ref(self.loader), name)
         if self.cache is not None:
-            template = self.cache.get(name)
-            if template is not None and (not self.auto_reload or \
-                                         template.is_up_to_date):
+            template = self.cache.get(cache_key)
+            if template is not None and (
+                not self.auto_reload or template.is_up_to_date
+            ):
+                # template.globals is a ChainMap, modifying it will only
+                # affect the template, not the environment globals.
+                if globals:
+                    template.globals.update(globals)
+
                 return template
-        template = self.loader.load(self, name, globals)
+
+        template = self.loader.load(self, name, self.make_globals(globals))
+
         if self.cache is not None:
-            self.cache[name] = template
+            self.cache[cache_key] = template
         return template
 
     @internalcode
-    def get_template(self, name, parent=None, globals=None):
-        """Load a template from the loader.  If a loader is configured this
-        method ask the loader for the template and returns a :class:`Template`.
-        If the `parent` parameter is not `None`, :meth:`join_path` is called
-        to get the real template name before loading.
+    def get_template(
+        self,
+        name: t.Union[str, "Template"],
+        parent: t.Optional[str] = None,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        """Load a template by name with :attr:`loader` and return a
+        :class:`Template`. If the template does not exist a
+        :exc:`TemplateNotFound` exception is raised.
 
-        The `globals` parameter can be used to provide template wide globals.
-        These variables are available in the context at render time.
+        :param name: Name of the template to load. When loading
+            templates from the filesystem, "/" is used as the path
+            separator, even on Windows.
+        :param parent: The name of the parent template importing this
+            template. :meth:`join_path` can be used to implement name
+            transformations with this.
+        :param globals: Extend the environment :attr:`globals` with
+            these extra variables available for all renders of this
+            template. If the template has already been loaded and
+            cached, its globals are updated with any new items.
 
-        If the template does not exist a :exc:`TemplateNotFound` exception is
-        raised.
+        .. versionchanged:: 3.0
+            If a template is loaded from cache, ``globals`` will update
+            the template's globals instead of ignoring the new values.
 
         .. versionchanged:: 2.4
-           If `name` is a :class:`Template` object it is returned from the
-           function unchanged.
+            If ``name`` is a :class:`Template` object it is returned
+            unchanged.
         """
         if isinstance(name, Template):
             return name
         if parent is not None:
             name = self.join_path(name, parent)
-        return self._load_template(name, self.make_globals(globals))
+
+        return self._load_template(name, globals)
 
     @internalcode
-    def select_template(self, names, parent=None, globals=None):
-        """Works like :meth:`get_template` but tries a number of templates
-        before it fails.  If it cannot find any of the templates, it will
-        raise a :exc:`TemplatesNotFound` exception.
+    def select_template(
+        self,
+        names: t.Iterable[t.Union[str, "Template"]],
+        parent: t.Optional[str] = None,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        """Like :meth:`get_template`, but tries loading multiple names.
+        If none of the names can be loaded a :exc:`TemplatesNotFound`
+        exception is raised.
 
-        .. versionadded:: 2.3
+        :param names: List of template names to try loading in order.
+        :param parent: The name of the parent template importing this
+            template. :meth:`join_path` can be used to implement name
+            transformations with this.
+        :param globals: Extend the environment :attr:`globals` with
+            these extra variables available for all renders of this
+            template. If the template has already been loaded and
+            cached, its globals are updated with any new items.
+
+        .. versionchanged:: 3.0
+            If a template is loaded from cache, ``globals`` will update
+            the template's globals instead of ignoring the new values.
+
+        .. versionchanged:: 2.11
+            If ``names`` is :class:`Undefined`, an :exc:`UndefinedError`
+            is raised instead. If no templates were found and ``names``
+            contains :class:`Undefined`, the message is more helpful.
 
         .. versionchanged:: 2.4
-           If `names` contains a :class:`Template` object it is returned
-           from the function unchanged.
+            If ``names`` contains a :class:`Template` object it is
+            returned unchanged.
+
+        .. versionadded:: 2.3
         """
+        if isinstance(names, Undefined):
+            names._fail_with_undefined_error()
+
         if not names:
-            raise TemplatesNotFound(message=u'Tried to select from an empty list '
-                                            u'of templates.')
-        globals = self.make_globals(globals)
+            raise TemplatesNotFound(
+                message="Tried to select from an empty list of templates."
+            )
+
         for name in names:
             if isinstance(name, Template):
                 return name
@@ -813,114 +1059,178 @@
                 name = self.join_path(name, parent)
             try:
                 return self._load_template(name, globals)
-            except TemplateNotFound:
+            except (TemplateNotFound, UndefinedError):
                 pass
-        raise TemplatesNotFound(names)
+        raise TemplatesNotFound(names)  # type: ignore
 
     @internalcode
-    def get_or_select_template(self, template_name_or_list,
-                               parent=None, globals=None):
-        """Does a typecheck and dispatches to :meth:`select_template`
-        if an iterable of template names is given, otherwise to
-        :meth:`get_template`.
+    def get_or_select_template(
+        self,
+        template_name_or_list: t.Union[
+            str, "Template", t.List[t.Union[str, "Template"]]
+        ],
+        parent: t.Optional[str] = None,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        """Use :meth:`select_template` if an iterable of template names
+        is given, or :meth:`get_template` if one name is given.
 
         .. versionadded:: 2.3
         """
-        if isinstance(template_name_or_list, string_types):
+        if isinstance(template_name_or_list, (str, Undefined)):
             return self.get_template(template_name_or_list, parent, globals)
         elif isinstance(template_name_or_list, Template):
             return template_name_or_list
         return self.select_template(template_name_or_list, parent, globals)
 
-    def from_string(self, source, globals=None, template_class=None):
-        """Load a template from a string.  This parses the source given and
-        returns a :class:`Template` object.
+    def from_string(
+        self,
+        source: t.Union[str, nodes.Template],
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+        template_class: t.Optional[t.Type["Template"]] = None,
+    ) -> "Template":
+        """Load a template from a source string without using
+        :attr:`loader`.
+
+        :param source: Jinja source to compile into a template.
+        :param globals: Extend the environment :attr:`globals` with
+            these extra variables available for all renders of this
+            template. If the template has already been loaded and
+            cached, its globals are updated with any new items.
+        :param template_class: Return an instance of this
+            :class:`Template` class.
         """
-        globals = self.make_globals(globals)
+        gs = self.make_globals(globals)
         cls = template_class or self.template_class
-        return cls.from_code(self, self.compile(source), globals, None)
+        return cls.from_code(self, self.compile(source), gs, None)
 
-    def make_globals(self, d):
-        """Return a dict for the globals."""
-        if not d:
-            return self.globals
-        return dict(self.globals, **d)
+    def make_globals(
+        self, d: t.Optional[t.MutableMapping[str, t.Any]]
+    ) -> t.MutableMapping[str, t.Any]:
+        """Make the globals map for a template. Any given template
+        globals overlay the environment :attr:`globals`.
+
+        Returns a :class:`collections.ChainMap`. This allows any changes
+        to a template's globals to only affect that template, while
+        changes to the environment's globals are still reflected.
+        However, avoid modifying any globals after a template is loaded.
+
+        :param d: Dict of template-specific globals.
+
+        .. versionchanged:: 3.0
+            Use :class:`collections.ChainMap` to always prevent mutating
+            environment globals.
+        """
+        if d is None:
+            d = {}
+
+        return ChainMap(d, self.globals)
 
 
-class Template(object):
-    """The central template object.  This class represents a compiled template
-    and is used to evaluate it.
+class Template:
+    """A compiled template that can be rendered.
 
-    Normally the template object is generated from an :class:`Environment` but
-    it also has a constructor that makes it possible to create a template
-    instance directly using the constructor.  It takes the same arguments as
-    the environment constructor but it's not possible to specify a loader.
+    Use the methods on :class:`Environment` to create or load templates.
+    The environment is used to configure how templates are compiled and
+    behave.
 
-    Every template object has a few methods and members that are guaranteed
-    to exist.  However it's important that a template object should be
-    considered immutable.  Modifications on the object are not supported.
+    It is also possible to create a template object directly. This is
+    not usually recommended. The constructor takes most of the same
+    arguments as :class:`Environment`. All templates created with the
+    same environment arguments share the same ephemeral ``Environment``
+    instance behind the scenes.
 
-    Template objects created from the constructor rather than an environment
-    do have an `environment` attribute that points to a temporary environment
-    that is probably shared with other templates created with the constructor
-    and compatible settings.
-
-    >>> template = Template('Hello {{ name }}!')
-    >>> template.render(name='John Doe')
-    u'Hello John Doe!'
-
-    >>> stream = template.stream(name='John Doe')
-    >>> stream.next()
-    u'Hello John Doe!'
-    >>> stream.next()
-    Traceback (most recent call last):
-        ...
-    StopIteration
+    A template object should be considered immutable. Modifications on
+    the object are not supported.
     """
 
-    def __new__(cls, source,
-                block_start_string=BLOCK_START_STRING,
-                block_end_string=BLOCK_END_STRING,
-                variable_start_string=VARIABLE_START_STRING,
-                variable_end_string=VARIABLE_END_STRING,
-                comment_start_string=COMMENT_START_STRING,
-                comment_end_string=COMMENT_END_STRING,
-                line_statement_prefix=LINE_STATEMENT_PREFIX,
-                line_comment_prefix=LINE_COMMENT_PREFIX,
-                trim_blocks=TRIM_BLOCKS,
-                lstrip_blocks=LSTRIP_BLOCKS,
-                newline_sequence=NEWLINE_SEQUENCE,
-                keep_trailing_newline=KEEP_TRAILING_NEWLINE,
-                extensions=(),
-                optimized=True,
-                undefined=Undefined,
-                finalize=None,
-                autoescape=False):
+    #: Type of environment to create when creating a template directly
+    #: rather than through an existing environment.
+    environment_class: t.Type[Environment] = Environment
+
+    environment: Environment
+    globals: t.MutableMapping[str, t.Any]
+    name: t.Optional[str]
+    filename: t.Optional[str]
+    blocks: t.Dict[str, t.Callable[[Context], t.Iterator[str]]]
+    root_render_func: t.Callable[[Context], t.Iterator[str]]
+    _module: t.Optional["TemplateModule"]
+    _debug_info: str
+    _uptodate: t.Optional[t.Callable[[], bool]]
+
+    def __new__(
+        cls,
+        source: t.Union[str, nodes.Template],
+        block_start_string: str = BLOCK_START_STRING,
+        block_end_string: str = BLOCK_END_STRING,
+        variable_start_string: str = VARIABLE_START_STRING,
+        variable_end_string: str = VARIABLE_END_STRING,
+        comment_start_string: str = COMMENT_START_STRING,
+        comment_end_string: str = COMMENT_END_STRING,
+        line_statement_prefix: t.Optional[str] = LINE_STATEMENT_PREFIX,
+        line_comment_prefix: t.Optional[str] = LINE_COMMENT_PREFIX,
+        trim_blocks: bool = TRIM_BLOCKS,
+        lstrip_blocks: bool = LSTRIP_BLOCKS,
+        newline_sequence: "te.Literal['\\n', '\\r\\n', '\\r']" = NEWLINE_SEQUENCE,
+        keep_trailing_newline: bool = KEEP_TRAILING_NEWLINE,
+        extensions: t.Sequence[t.Union[str, t.Type["Extension"]]] = (),
+        optimized: bool = True,
+        undefined: t.Type[Undefined] = Undefined,
+        finalize: t.Optional[t.Callable[..., t.Any]] = None,
+        autoescape: t.Union[bool, t.Callable[[t.Optional[str]], bool]] = False,
+        enable_async: bool = False,
+    ) -> t.Any:  # it returns a `Template`, but this breaks the sphinx build...
         env = get_spontaneous_environment(
-            block_start_string, block_end_string, variable_start_string,
-            variable_end_string, comment_start_string, comment_end_string,
-            line_statement_prefix, line_comment_prefix, trim_blocks,
-            lstrip_blocks, newline_sequence, keep_trailing_newline,
-            frozenset(extensions), optimized, undefined, finalize, autoescape,
-            None, 0, False, None)
+            cls.environment_class,  # type: ignore
+            block_start_string,
+            block_end_string,
+            variable_start_string,
+            variable_end_string,
+            comment_start_string,
+            comment_end_string,
+            line_statement_prefix,
+            line_comment_prefix,
+            trim_blocks,
+            lstrip_blocks,
+            newline_sequence,
+            keep_trailing_newline,
+            frozenset(extensions),
+            optimized,
+            undefined,  # type: ignore
+            finalize,
+            autoescape,
+            None,
+            0,
+            False,
+            None,
+            enable_async,
+        )
         return env.from_string(source, template_class=cls)
 
     @classmethod
-    def from_code(cls, environment, code, globals, uptodate=None):
+    def from_code(
+        cls,
+        environment: Environment,
+        code: CodeType,
+        globals: t.MutableMapping[str, t.Any],
+        uptodate: t.Optional[t.Callable[[], bool]] = None,
+    ) -> "Template":
         """Creates a template object from compiled code and the globals.  This
         is used by the loaders and environment to create a template object.
         """
-        namespace = {
-            'environment':  environment,
-            '__file__':     code.co_filename
-        }
+        namespace = {"environment": environment, "__file__": code.co_filename}
         exec(code, namespace)
         rv = cls._from_namespace(environment, namespace, globals)
         rv._uptodate = uptodate
         return rv
 
     @classmethod
-    def from_module_dict(cls, environment, module_dict, globals):
+    def from_module_dict(
+        cls,
+        environment: Environment,
+        module_dict: t.MutableMapping[str, t.Any],
+        globals: t.MutableMapping[str, t.Any],
+    ) -> "Template":
         """Creates a template object from a module.  This is used by the
         module loader to create a template object.
 
@@ -929,29 +1239,34 @@
         return cls._from_namespace(environment, module_dict, globals)
 
     @classmethod
-    def _from_namespace(cls, environment, namespace, globals):
-        t = object.__new__(cls)
+    def _from_namespace(
+        cls,
+        environment: Environment,
+        namespace: t.MutableMapping[str, t.Any],
+        globals: t.MutableMapping[str, t.Any],
+    ) -> "Template":
+        t: "Template" = object.__new__(cls)
         t.environment = environment
         t.globals = globals
-        t.name = namespace['name']
-        t.filename = namespace['__file__']
-        t.blocks = namespace['blocks']
+        t.name = namespace["name"]
+        t.filename = namespace["__file__"]
+        t.blocks = namespace["blocks"]
 
         # render function and module
-        t.root_render_func = namespace['root']
+        t.root_render_func = namespace["root"]  # type: ignore
         t._module = None
 
         # debug and loader helpers
-        t._debug_info = namespace['debug_info']
+        t._debug_info = namespace["debug_info"]
         t._uptodate = None
 
         # store the reference
-        namespace['environment'] = environment
-        namespace['__jinja_template__'] = t
+        namespace["environment"] = environment
+        namespace["__jinja_template__"] = t
 
         return t
 
-    def render(self, *args, **kwargs):
+    def render(self, *args: t.Any, **kwargs: t.Any) -> str:
         """This method accepts the same arguments as the `dict` constructor:
         A dict, a dict subclass or some keyword arguments.  If no arguments
         are given the context will be empty.  These two calls do the same::
@@ -959,77 +1274,210 @@
             template.render(knights='that say nih')
             template.render({'knights': 'that say nih'})
 
-        This will return the rendered template as unicode string.
+        This will return the rendered template as a string.
         """
-        vars = dict(*args, **kwargs)
-        try:
-            return concat(self.root_render_func(self.new_context(vars)))
-        except Exception:
-            exc_info = sys.exc_info()
-        return self.environment.handle_exception(exc_info, True)
+        if self.environment.is_async:
+            import asyncio
 
-    def stream(self, *args, **kwargs):
+            close = False
+
+            try:
+                loop = asyncio.get_running_loop()
+            except RuntimeError:
+                loop = asyncio.new_event_loop()
+                close = True
+
+            try:
+                return loop.run_until_complete(self.render_async(*args, **kwargs))
+            finally:
+                if close:
+                    loop.close()
+
+        ctx = self.new_context(dict(*args, **kwargs))
+
+        try:
+            return self.environment.concat(self.root_render_func(ctx))  # type: ignore
+        except Exception:
+            self.environment.handle_exception()
+
+    async def render_async(self, *args: t.Any, **kwargs: t.Any) -> str:
+        """This works similar to :meth:`render` but returns a coroutine
+        that when awaited returns the entire rendered template string.  This
+        requires the async feature to be enabled.
+
+        Example usage::
+
+            await template.render_async(knights='that say nih; asynchronously')
+        """
+        if not self.environment.is_async:
+            raise RuntimeError(
+                "The environment was not created with async mode enabled."
+            )
+
+        ctx = self.new_context(dict(*args, **kwargs))
+
+        try:
+            return self.environment.concat(  # type: ignore
+                [n async for n in self.root_render_func(ctx)]  # type: ignore
+            )
+        except Exception:
+            return self.environment.handle_exception()
+
+    def stream(self, *args: t.Any, **kwargs: t.Any) -> "TemplateStream":
         """Works exactly like :meth:`generate` but returns a
         :class:`TemplateStream`.
         """
         return TemplateStream(self.generate(*args, **kwargs))
 
-    def generate(self, *args, **kwargs):
+    def generate(self, *args: t.Any, **kwargs: t.Any) -> t.Iterator[str]:
         """For very large templates it can be useful to not render the whole
         template at once but evaluate each statement after another and yield
         piece for piece.  This method basically does exactly that and returns
-        a generator that yields one item after another as unicode strings.
+        a generator that yields one item after another as strings.
 
         It accepts the same arguments as :meth:`render`.
         """
-        vars = dict(*args, **kwargs)
+        if self.environment.is_async:
+            import asyncio
+
+            async def to_list() -> t.List[str]:
+                return [x async for x in self.generate_async(*args, **kwargs)]
+
+            yield from asyncio.run(to_list())
+            return
+
+        ctx = self.new_context(dict(*args, **kwargs))
+
         try:
-            for event in self.root_render_func(self.new_context(vars)):
+            yield from self.root_render_func(ctx)  # type: ignore
+        except Exception:
+            yield self.environment.handle_exception()
+
+    async def generate_async(
+        self, *args: t.Any, **kwargs: t.Any
+    ) -> t.AsyncIterator[str]:
+        """An async version of :meth:`generate`.  Works very similarly but
+        returns an async iterator instead.
+        """
+        if not self.environment.is_async:
+            raise RuntimeError(
+                "The environment was not created with async mode enabled."
+            )
+
+        ctx = self.new_context(dict(*args, **kwargs))
+
+        try:
+            async for event in self.root_render_func(ctx):  # type: ignore
                 yield event
         except Exception:
-            exc_info = sys.exc_info()
-        else:
-            return
-        yield self.environment.handle_exception(exc_info, True)
+            yield self.environment.handle_exception()
 
-    def new_context(self, vars=None, shared=False, locals=None):
+    def new_context(
+        self,
+        vars: t.Optional[t.Dict[str, t.Any]] = None,
+        shared: bool = False,
+        locals: t.Optional[t.Mapping[str, t.Any]] = None,
+    ) -> Context:
         """Create a new :class:`Context` for this template.  The vars
         provided will be passed to the template.  Per default the globals
         are added to the context.  If shared is set to `True` the data
-        is passed as it to the context without adding the globals.
+        is passed as is to the context without adding the globals.
 
         `locals` can be a dict of local variables for internal usage.
         """
-        return new_context(self.environment, self.name, self.blocks,
-                           vars, shared, self.globals, locals)
+        return new_context(
+            self.environment, self.name, self.blocks, vars, shared, self.globals, locals
+        )
 
-    def make_module(self, vars=None, shared=False, locals=None):
+    def make_module(
+        self,
+        vars: t.Optional[t.Dict[str, t.Any]] = None,
+        shared: bool = False,
+        locals: t.Optional[t.Mapping[str, t.Any]] = None,
+    ) -> "TemplateModule":
         """This method works like the :attr:`module` attribute when called
         without arguments but it will evaluate the template on every call
         rather than caching it.  It's also possible to provide
         a dict which is then used as context.  The arguments are the same
         as for the :meth:`new_context` method.
         """
-        return TemplateModule(self, self.new_context(vars, shared, locals))
+        ctx = self.new_context(vars, shared, locals)
+        return TemplateModule(self, ctx)
+
+    async def make_module_async(
+        self,
+        vars: t.Optional[t.Dict[str, t.Any]] = None,
+        shared: bool = False,
+        locals: t.Optional[t.Mapping[str, t.Any]] = None,
+    ) -> "TemplateModule":
+        """As template module creation can invoke template code for
+        asynchronous executions this method must be used instead of the
+        normal :meth:`make_module` one.  Likewise the module attribute
+        becomes unavailable in async mode.
+        """
+        ctx = self.new_context(vars, shared, locals)
+        return TemplateModule(
+            self, ctx, [x async for x in self.root_render_func(ctx)]  # type: ignore
+        )
+
+    @internalcode
+    def _get_default_module(self, ctx: t.Optional[Context] = None) -> "TemplateModule":
+        """If a context is passed in, this means that the template was
+        imported. Imported templates have access to the current
+        template's globals by default, but they can only be accessed via
+        the context during runtime.
+
+        If there are new globals, we need to create a new module because
+        the cached module is already rendered and will not have access
+        to globals from the current context. This new module is not
+        cached because the template can be imported elsewhere, and it
+        should have access to only the current template's globals.
+        """
+        if self.environment.is_async:
+            raise RuntimeError("Module is not available in async mode.")
+
+        if ctx is not None:
+            keys = ctx.globals_keys - self.globals.keys()
+
+            if keys:
+                return self.make_module({k: ctx.parent[k] for k in keys})
+
+        if self._module is None:
+            self._module = self.make_module()
+
+        return self._module
+
+    async def _get_default_module_async(
+        self, ctx: t.Optional[Context] = None
+    ) -> "TemplateModule":
+        if ctx is not None:
+            keys = ctx.globals_keys - self.globals.keys()
+
+            if keys:
+                return await self.make_module_async({k: ctx.parent[k] for k in keys})
+
+        if self._module is None:
+            self._module = await self.make_module_async()
+
+        return self._module
 
     @property
-    def module(self):
+    def module(self) -> "TemplateModule":
         """The template as module.  This is used for imports in the
         template runtime but is also useful if one wants to access
         exported template variables from the Python layer:
 
         >>> t = Template('{% macro foo() %}42{% endmacro %}23')
-        >>> unicode(t.module)
-        u'23'
-        >>> t.module.foo()
-        u'42'
-        """
-        if self._module is not None:
-            return self._module
-        self._module = rv = self.make_module()
-        return rv
+        >>> str(t.module)
+        '23'
+        >>> t.module.foo() == u'42'
+        True
 
-    def get_corresponding_lineno(self, lineno):
+        This attribute is not available if async mode is enabled.
+        """
+        return self._get_default_module()
+
+    def get_corresponding_lineno(self, lineno: int) -> int:
         """Return the source line number of a line number in the
         generated bytecode as they are not in sync.
         """
@@ -1039,90 +1487,113 @@
         return 1
 
     @property
-    def is_up_to_date(self):
+    def is_up_to_date(self) -> bool:
         """If this variable is `False` there is a newer version available."""
         if self._uptodate is None:
             return True
         return self._uptodate()
 
     @property
-    def debug_info(self):
+    def debug_info(self) -> t.List[t.Tuple[int, int]]:
         """The debug info mapping."""
-        return [tuple(imap(int, x.split('='))) for x in
-                self._debug_info.split('&')]
+        if self._debug_info:
+            return [
+                tuple(map(int, x.split("=")))  # type: ignore
+                for x in self._debug_info.split("&")
+            ]
 
-    def __repr__(self):
+        return []
+
+    def __repr__(self) -> str:
         if self.name is None:
-            name = 'memory:%x' % id(self)
+            name = f"memory:{id(self):x}"
         else:
             name = repr(self.name)
-        return '<%s %s>' % (self.__class__.__name__, name)
+        return f"<{type(self).__name__} {name}>"
 
 
-@implements_to_string
-class TemplateModule(object):
+class TemplateModule:
     """Represents an imported template.  All the exported names of the
     template are available as attributes on this object.  Additionally
-    converting it into an unicode- or bytestrings renders the contents.
+    converting it into a string renders the contents.
     """
 
-    def __init__(self, template, context):
-        self._body_stream = list(template.root_render_func(context))
+    def __init__(
+        self,
+        template: Template,
+        context: Context,
+        body_stream: t.Optional[t.Iterable[str]] = None,
+    ) -> None:
+        if body_stream is None:
+            if context.environment.is_async:
+                raise RuntimeError(
+                    "Async mode requires a body stream to be passed to"
+                    " a template module. Use the async methods of the"
+                    " API you are using."
+                )
+
+            body_stream = list(template.root_render_func(context))  # type: ignore
+
+        self._body_stream = body_stream
         self.__dict__.update(context.get_exported())
         self.__name__ = template.name
 
-    def __html__(self):
+    def __html__(self) -> Markup:
         return Markup(concat(self._body_stream))
 
-    def __str__(self):
+    def __str__(self) -> str:
         return concat(self._body_stream)
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         if self.__name__ is None:
-            name = 'memory:%x' % id(self)
+            name = f"memory:{id(self):x}"
         else:
             name = repr(self.__name__)
-        return '<%s %s>' % (self.__class__.__name__, name)
+        return f"<{type(self).__name__} {name}>"
 
 
-class TemplateExpression(object):
+class TemplateExpression:
     """The :meth:`jinja2.Environment.compile_expression` method returns an
     instance of this object.  It encapsulates the expression-like access
     to the template with an expression it wraps.
     """
 
-    def __init__(self, template, undefined_to_none):
+    def __init__(self, template: Template, undefined_to_none: bool) -> None:
         self._template = template
         self._undefined_to_none = undefined_to_none
 
-    def __call__(self, *args, **kwargs):
+    def __call__(self, *args: t.Any, **kwargs: t.Any) -> t.Optional[t.Any]:
         context = self._template.new_context(dict(*args, **kwargs))
-        consume(self._template.root_render_func(context))
-        rv = context.vars['result']
+        consume(self._template.root_render_func(context))  # type: ignore
+        rv = context.vars["result"]
         if self._undefined_to_none and isinstance(rv, Undefined):
             rv = None
         return rv
 
 
-@implements_iterator
-class TemplateStream(object):
+class TemplateStream:
     """A template stream works pretty much like an ordinary python generator
     but it can buffer multiple items to reduce the number of total iterations.
     Per default the output is unbuffered which means that for every unbuffered
-    instruction in the template one unicode string is yielded.
+    instruction in the template one string is yielded.
 
     If buffering is enabled with a buffer size of 5, five items are combined
-    into a new unicode string.  This is mainly useful if you are streaming
+    into a new string.  This is mainly useful if you are streaming
     big templates to a client via WSGI which flushes after each iteration.
     """
 
-    def __init__(self, gen):
+    def __init__(self, gen: t.Iterator[str]) -> None:
         self._gen = gen
         self.disable_buffering()
 
-    def dump(self, fp, encoding=None, errors='strict'):
+    def dump(
+        self,
+        fp: t.Union[str, t.IO],
+        encoding: t.Optional[str] = None,
+        errors: t.Optional[str] = "strict",
+    ) -> None:
         """Dump the complete stream into a file or file-like object.
-        Per default unicode strings are written, if you want to encode
+        Per default strings are written, if you want to encode
         before writing specify an `encoding`.
 
         Example usage::
@@ -1130,15 +1601,20 @@
             Template('Hello {{ name }}!').stream(name='foo').dump('hello.html')
         """
         close = False
-        if isinstance(fp, string_types):
-            fp = open(fp, encoding is None and 'w' or 'wb')
+
+        if isinstance(fp, str):
+            if encoding is None:
+                encoding = "utf-8"
+
+            fp = open(fp, "wb")
             close = True
         try:
             if encoding is not None:
-                iterable = (x.encode(encoding, errors) for x in self)
+                iterable = (x.encode(encoding, errors) for x in self)  # type: ignore
             else:
-                iterable = self
-            if hasattr(fp, 'writelines'):
+                iterable = self  # type: ignore
+
+            if hasattr(fp, "writelines"):
                 fp.writelines(iterable)
             else:
                 for item in iterable:
@@ -1147,43 +1623,43 @@
             if close:
                 fp.close()
 
-    def disable_buffering(self):
+    def disable_buffering(self) -> None:
         """Disable the output buffering."""
-        self._next = get_next(self._gen)
+        self._next = partial(next, self._gen)
         self.buffered = False
 
-    def enable_buffering(self, size=5):
+    def _buffered_generator(self, size: int) -> t.Iterator[str]:
+        buf: t.List[str] = []
+        c_size = 0
+        push = buf.append
+
+        while True:
+            try:
+                while c_size < size:
+                    c = next(self._gen)
+                    push(c)
+                    if c:
+                        c_size += 1
+            except StopIteration:
+                if not c_size:
+                    return
+            yield concat(buf)
+            del buf[:]
+            c_size = 0
+
+    def enable_buffering(self, size: int = 5) -> None:
         """Enable buffering.  Buffer `size` items before yielding them."""
         if size <= 1:
-            raise ValueError('buffer size too small')
-
-        def generator(next):
-            buf = []
-            c_size = 0
-            push = buf.append
-
-            while 1:
-                try:
-                    while c_size < size:
-                        c = next()
-                        push(c)
-                        if c:
-                            c_size += 1
-                except StopIteration:
-                    if not c_size:
-                        return
-                yield concat(buf)
-                del buf[:]
-                c_size = 0
+            raise ValueError("buffer size too small")
 
         self.buffered = True
-        self._next = get_next(generator(get_next(self._gen)))
+        self._next = partial(next, self._buffered_generator(size))
 
-    def __iter__(self):
+    def __iter__(self) -> "TemplateStream":
         return self
 
-    def __next__(self):
-        return self._next()
+    def __next__(self) -> str:
+        return self._next()  # type: ignore
 
 
 # hook in default template class.  if anyone reads this comment: ignore that

exceptions.py

diff --git a/exceptions.py b/exceptions.py
index c9df6dc..082ebe8 100644
--- a/exceptions.py
+++ b/exceptions.py
@@ -1,64 +1,53 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.exceptions
-    ~~~~~~~~~~~~~~~~~
+import typing as t
 
-    Jinja exceptions.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2._compat import imap, text_type, PY2, implements_to_string
+if t.TYPE_CHECKING:
+    from .runtime import Undefined
 
 
 class TemplateError(Exception):
     """Baseclass for all template errors."""
 
-    if PY2:
-        def __init__(self, message=None):
-            if message is not None:
-                message = text_type(message).encode('utf-8')
-            Exception.__init__(self, message)
+    def __init__(self, message: t.Optional[str] = None) -> None:
+        super().__init__(message)
 
-        @property
-        def message(self):
-            if self.args:
-                message = self.args[0]
-                if message is not None:
-                    return message.decode('utf-8', 'replace')
-
-        def __unicode__(self):
-            return self.message or u''
-    else:
-        def __init__(self, message=None):
-            Exception.__init__(self, message)
-
-        @property
-        def message(self):
-            if self.args:
-                message = self.args[0]
-                if message is not None:
-                    return message
+    @property
+    def message(self) -> t.Optional[str]:
+        return self.args[0] if self.args else None
 
 
-@implements_to_string
 class TemplateNotFound(IOError, LookupError, TemplateError):
-    """Raised if a template does not exist."""
+    """Raised if a template does not exist.
 
-    # looks weird, but removes the warning descriptor that just
-    # bogusly warns us about message being deprecated
-    message = None
+    .. versionchanged:: 2.11
+        If the given name is :class:`Undefined` and no message was
+        provided, an :exc:`UndefinedError` is raised.
+    """
 
-    def __init__(self, name, message=None):
-        IOError.__init__(self)
+    # Silence the Python warning about message being deprecated since
+    # it's not valid here.
+    message: t.Optional[str] = None
+
+    def __init__(
+        self,
+        name: t.Optional[t.Union[str, "Undefined"]],
+        message: t.Optional[str] = None,
+    ) -> None:
+        IOError.__init__(self, name)
+
         if message is None:
+            from .runtime import Undefined
+
+            if isinstance(name, Undefined):
+                name._fail_with_undefined_error()
+
             message = name
+
         self.message = message
         self.name = name
         self.templates = [name]
 
-    def __str__(self):
-        return self.message
+    def __str__(self) -> str:
+        return str(self.message)
 
 
 class TemplatesNotFound(TemplateNotFound):
@@ -66,54 +55,85 @@
     are selected.  This is a subclass of :class:`TemplateNotFound`
     exception, so just catching the base exception will catch both.
 
+    .. versionchanged:: 2.11
+        If a name in the list of names is :class:`Undefined`, a message
+        about it being undefined is shown rather than the empty string.
+
     .. versionadded:: 2.2
     """
 
-    def __init__(self, names=(), message=None):
+    def __init__(
+        self,
+        names: t.Sequence[t.Union[str, "Undefined"]] = (),
+        message: t.Optional[str] = None,
+    ) -> None:
         if message is None:
-            message = u'none of the templates given were found: ' + \
-                      u', '.join(imap(text_type, names))
-        TemplateNotFound.__init__(self, names and names[-1] or None, message)
+            from .runtime import Undefined
+
+            parts = []
+
+            for name in names:
+                if isinstance(name, Undefined):
+                    parts.append(name._undefined_message)
+                else:
+                    parts.append(name)
+
+            parts_str = ", ".join(map(str, parts))
+            message = f"none of the templates given were found: {parts_str}"
+
+        super().__init__(names[-1] if names else None, message)
         self.templates = list(names)
 
 
-@implements_to_string
 class TemplateSyntaxError(TemplateError):
     """Raised to tell the user that there is a problem with the template."""
 
-    def __init__(self, message, lineno, name=None, filename=None):
-        TemplateError.__init__(self, message)
+    def __init__(
+        self,
+        message: str,
+        lineno: int,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+    ) -> None:
+        super().__init__(message)
         self.lineno = lineno
         self.name = name
         self.filename = filename
-        self.source = None
+        self.source: t.Optional[str] = None
 
         # this is set to True if the debug.translate_syntax_error
         # function translated the syntax error into a new traceback
         self.translated = False
 
-    def __str__(self):
+    def __str__(self) -> str:
         # for translated errors we only return the message
         if self.translated:
-            return self.message
+            return t.cast(str, self.message)
 
         # otherwise attach some stuff
-        location = 'line %d' % self.lineno
+        location = f"line {self.lineno}"
         name = self.filename or self.name
         if name:
-            location = 'File "%s", %s' % (name, location)
-        lines = [self.message, '  ' + location]
+            location = f'File "{name}", {location}'
+        lines = [t.cast(str, self.message), "  " + location]
 
         # if the source is set, add the line to the output
         if self.source is not None:
             try:
                 line = self.source.splitlines()[self.lineno - 1]
             except IndexError:
-                line = None
-            if line:
-                lines.append('    ' + line.strip())
+                pass
+            else:
+                lines.append("    " + line.strip())
 
-        return u'\n'.join(lines)
+        return "\n".join(lines)
+
+    def __reduce__(self):  # type: ignore
+        # https://bugs.python.org/issue1692335 Exceptions that take
+        # multiple required arguments have problems with pickling.
+        # Without this, raises TypeError: __init__() missing 1 required
+        # positional argument: 'lineno'
+        return self.__class__, (self.message, self.lineno, self.name, self.filename)
 
 
 class TemplateAssertionError(TemplateSyntaxError):

ext.py

diff --git a/ext.py b/ext.py
index c2df12d..d555054 100644
--- a/ext.py
+++ b/ext.py
@@ -1,44 +1,57 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.ext
-    ~~~~~~~~~~
+"""Extension API for adding custom tags and behavior."""
+import pprint
+import re
+import typing as t
 
-    Jinja extensions allow to add custom tags similar to the way django custom
-    tags work.  By default two example extensions exist: an i18n and a cache
-    extension.
+from markupsafe import Markup
 
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD.
-"""
-from jinja2 import nodes
-from jinja2.defaults import BLOCK_START_STRING, \
-     BLOCK_END_STRING, VARIABLE_START_STRING, VARIABLE_END_STRING, \
-     COMMENT_START_STRING, COMMENT_END_STRING, LINE_STATEMENT_PREFIX, \
-     LINE_COMMENT_PREFIX, TRIM_BLOCKS, NEWLINE_SEQUENCE, \
-     KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
-from jinja2.environment import Environment
-from jinja2.runtime import concat
-from jinja2.exceptions import TemplateAssertionError, TemplateSyntaxError
-from jinja2.utils import contextfunction, import_string, Markup
-from jinja2._compat import next, with_metaclass, string_types, iteritems
+from . import defaults
+from . import nodes
+from .environment import Environment
+from .exceptions import TemplateAssertionError
+from .exceptions import TemplateSyntaxError
+from .runtime import concat  # type: ignore
+from .runtime import Context
+from .runtime import Undefined
+from .utils import import_string
+from .utils import pass_context
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .lexer import Token
+    from .lexer import TokenStream
+    from .parser import Parser
+
+    class _TranslationsBasic(te.Protocol):
+        def gettext(self, message: str) -> str:
+            ...
+
+        def ngettext(self, singular: str, plural: str, n: int) -> str:
+            pass
+
+    class _TranslationsContext(_TranslationsBasic):
+        def pgettext(self, context: str, message: str) -> str:
+            ...
+
+        def npgettext(self, context: str, singular: str, plural: str, n: int) -> str:
+            ...
+
+    _SupportedTranslations = t.Union[_TranslationsBasic, _TranslationsContext]
 
 
-# the only real useful gettext functions for a Jinja template.  Note
-# that ugettext must be assigned to gettext as Jinja doesn't support
-# non unicode strings.
-GETTEXT_FUNCTIONS = ('_', 'gettext', 'ngettext')
+# I18N functions available in Jinja templates. If the I18N library
+# provides ugettext, it will be assigned to gettext.
+GETTEXT_FUNCTIONS: t.Tuple[str, ...] = (
+    "_",
+    "gettext",
+    "ngettext",
+    "pgettext",
+    "npgettext",
+)
+_ws_re = re.compile(r"\s*\n\s*")
 
 
-class ExtensionRegistry(type):
-    """Gives the extension an unique identifier."""
-
-    def __new__(cls, name, bases, d):
-        rv = type.__new__(cls, name, bases, d)
-        rv.identifier = rv.__module__ + '.' + rv.__name__
-        return rv
-
-
-class Extension(with_metaclass(ExtensionRegistry, object)):
+class Extension:
     """Extensions can be used to add extra functionality to the Jinja template
     system at the parser level.  Custom extensions are bound to an environment
     but may not store environment specific data on `self`.  The reason for
@@ -57,8 +70,13 @@
     name as includes the name of the extension (fragment cache).
     """
 
+    identifier: t.ClassVar[str]
+
+    def __init_subclass__(cls) -> None:
+        cls.identifier = f"{cls.__module__}.{cls.__name__}"
+
     #: if this extension parses this is the list of tags it's listening to.
-    tags = set()
+    tags: t.Set[str] = set()
 
     #: the priority of that extension.  This is especially useful for
     #: extensions that preprocess values.  A lower value means higher
@@ -67,36 +85,36 @@
     #: .. versionadded:: 2.4
     priority = 100
 
-    def __init__(self, environment):
+    def __init__(self, environment: Environment) -> None:
         self.environment = environment
 
-    def bind(self, environment):
+    def bind(self, environment: Environment) -> "Extension":
         """Create a copy of this extension bound to another environment."""
         rv = object.__new__(self.__class__)
         rv.__dict__.update(self.__dict__)
         rv.environment = environment
         return rv
 
-    def preprocess(self, source, name, filename=None):
+    def preprocess(
+        self, source: str, name: t.Optional[str], filename: t.Optional[str] = None
+    ) -> str:
         """This method is called before the actual lexing and can be used to
         preprocess the source.  The `filename` is optional.  The return value
         must be the preprocessed source.
         """
         return source
 
-    def filter_stream(self, stream):
+    def filter_stream(
+        self, stream: "TokenStream"
+    ) -> t.Union["TokenStream", t.Iterable["Token"]]:
         """It's passed a :class:`~jinja2.lexer.TokenStream` that can be used
         to filter tokens returned.  This method has to return an iterable of
-        :class:`~jinja2.lexer.Token`\s, but it doesn't have to return a
+        :class:`~jinja2.lexer.Token`\\s, but it doesn't have to return a
         :class:`~jinja2.lexer.TokenStream`.
-
-        In the `ext` folder of the Jinja2 source distribution there is a file
-        called `inlinegettext.py` which implements a filter that utilizes this
-        method.
         """
         return stream
 
-    def parse(self, parser):
+    def parse(self, parser: "Parser") -> t.Union[nodes.Node, t.List[nodes.Node]]:
         """If any of the :attr:`tags` matched this method is called with the
         parser as first argument.  The token the parser stream is pointing at
         is the name token that matched.  This method has to return one or a
@@ -104,7 +122,9 @@
         """
         raise NotImplementedError()
 
-    def attr(self, name, lineno=None):
+    def attr(
+        self, name: str, lineno: t.Optional[int] = None
+    ) -> nodes.ExtensionAttribute:
         """Return an attribute node for the current extension.  This is useful
         to pass constants on extensions to generated template code.
 
@@ -114,8 +134,15 @@
         """
         return nodes.ExtensionAttribute(self.identifier, name, lineno=lineno)
 
-    def call_method(self, name, args=None, kwargs=None, dyn_args=None,
-                    dyn_kwargs=None, lineno=None):
+    def call_method(
+        self,
+        name: str,
+        args: t.Optional[t.List[nodes.Expr]] = None,
+        kwargs: t.Optional[t.List[nodes.Keyword]] = None,
+        dyn_args: t.Optional[nodes.Expr] = None,
+        dyn_kwargs: t.Optional[nodes.Expr] = None,
+        lineno: t.Optional[int] = None,
+    ) -> nodes.Call:
         """Call a method of the extension.  This is a shortcut for
         :meth:`attr` + :class:`jinja2.nodes.Call`.
         """
@@ -123,39 +150,102 @@
             args = []
         if kwargs is None:
             kwargs = []
-        return nodes.Call(self.attr(name, lineno=lineno), args, kwargs,
-                          dyn_args, dyn_kwargs, lineno=lineno)
+        return nodes.Call(
+            self.attr(name, lineno=lineno),
+            args,
+            kwargs,
+            dyn_args,
+            dyn_kwargs,
+            lineno=lineno,
+        )
 
 
-@contextfunction
-def _gettext_alias(__context, *args, **kwargs):
-    return __context.call(__context.resolve('gettext'), *args, **kwargs)
+@pass_context
+def _gettext_alias(
+    __context: Context, *args: t.Any, **kwargs: t.Any
+) -> t.Union[t.Any, Undefined]:
+    return __context.call(__context.resolve("gettext"), *args, **kwargs)
 
 
-def _make_new_gettext(func):
-    @contextfunction
-    def gettext(__context, __string, **variables):
+def _make_new_gettext(func: t.Callable[[str], str]) -> t.Callable[..., str]:
+    @pass_context
+    def gettext(__context: Context, __string: str, **variables: t.Any) -> str:
         rv = __context.call(func, __string)
         if __context.eval_ctx.autoescape:
             rv = Markup(rv)
-        return rv % variables
+        # Always treat as a format string, even if there are no
+        # variables. This makes translation strings more consistent
+        # and predictable. This requires escaping
+        return rv % variables  # type: ignore
+
     return gettext
 
 
-def _make_new_ngettext(func):
-    @contextfunction
-    def ngettext(__context, __singular, __plural, __num, **variables):
-        variables.setdefault('num', __num)
+def _make_new_ngettext(func: t.Callable[[str, str, int], str]) -> t.Callable[..., str]:
+    @pass_context
+    def ngettext(
+        __context: Context,
+        __singular: str,
+        __plural: str,
+        __num: int,
+        **variables: t.Any,
+    ) -> str:
+        variables.setdefault("num", __num)
         rv = __context.call(func, __singular, __plural, __num)
         if __context.eval_ctx.autoescape:
             rv = Markup(rv)
-        return rv % variables
+        # Always treat as a format string, see gettext comment above.
+        return rv % variables  # type: ignore
+
     return ngettext
 
 
+def _make_new_pgettext(func: t.Callable[[str, str], str]) -> t.Callable[..., str]:
+    @pass_context
+    def pgettext(
+        __context: Context, __string_ctx: str, __string: str, **variables: t.Any
+    ) -> str:
+        variables.setdefault("context", __string_ctx)
+        rv = __context.call(func, __string_ctx, __string)
+
+        if __context.eval_ctx.autoescape:
+            rv = Markup(rv)
+
+        # Always treat as a format string, see gettext comment above.
+        return rv % variables  # type: ignore
+
+    return pgettext
+
+
+def _make_new_npgettext(
+    func: t.Callable[[str, str, str, int], str]
+) -> t.Callable[..., str]:
+    @pass_context
+    def npgettext(
+        __context: Context,
+        __string_ctx: str,
+        __singular: str,
+        __plural: str,
+        __num: int,
+        **variables: t.Any,
+    ) -> str:
+        variables.setdefault("context", __string_ctx)
+        variables.setdefault("num", __num)
+        rv = __context.call(func, __string_ctx, __singular, __plural, __num)
+
+        if __context.eval_ctx.autoescape:
+            rv = Markup(rv)
+
+        # Always treat as a format string, see gettext comment above.
+        return rv % variables  # type: ignore
+
+    return npgettext
+
+
 class InternationalizationExtension(Extension):
-    """This extension adds gettext support to Jinja2."""
-    tags = set(['trans'])
+    """This extension adds gettext support to Jinja."""
+
+    tags = {"trans"}
 
     # TODO: the i18n extension is currently reevaluating values in a few
     # situations.  Take this example:
@@ -164,99 +254,161 @@
     # something is called twice here.  One time for the gettext value and
     # the other time for the n-parameter of the ngettext function.
 
-    def __init__(self, environment):
-        Extension.__init__(self, environment)
-        environment.globals['_'] = _gettext_alias
+    def __init__(self, environment: Environment) -> None:
+        super().__init__(environment)
+        environment.globals["_"] = _gettext_alias
         environment.extend(
             install_gettext_translations=self._install,
             install_null_translations=self._install_null,
             install_gettext_callables=self._install_callables,
             uninstall_gettext_translations=self._uninstall,
             extract_translations=self._extract,
-            newstyle_gettext=False
+            newstyle_gettext=False,
         )
 
-    def _install(self, translations, newstyle=None):
-        gettext = getattr(translations, 'ugettext', None)
+    def _install(
+        self, translations: "_SupportedTranslations", newstyle: t.Optional[bool] = None
+    ) -> None:
+        # ugettext and ungettext are preferred in case the I18N library
+        # is providing compatibility with older Python versions.
+        gettext = getattr(translations, "ugettext", None)
         if gettext is None:
             gettext = translations.gettext
-        ngettext = getattr(translations, 'ungettext', None)
+        ngettext = getattr(translations, "ungettext", None)
         if ngettext is None:
             ngettext = translations.ngettext
-        self._install_callables(gettext, ngettext, newstyle)
 
-    def _install_null(self, newstyle=None):
+        pgettext = getattr(translations, "pgettext", None)
+        npgettext = getattr(translations, "npgettext", None)
         self._install_callables(
-            lambda x: x,
-            lambda s, p, n: (n != 1 and (p,) or (s,))[0],
-            newstyle
+            gettext, ngettext, newstyle=newstyle, pgettext=pgettext, npgettext=npgettext
         )
 
-    def _install_callables(self, gettext, ngettext, newstyle=None):
+    def _install_null(self, newstyle: t.Optional[bool] = None) -> None:
+        import gettext
+
+        translations = gettext.NullTranslations()
+
+        if hasattr(translations, "pgettext"):
+            # Python < 3.8
+            pgettext = translations.pgettext  # type: ignore
+        else:
+
+            def pgettext(c: str, s: str) -> str:
+                return s
+
+        if hasattr(translations, "npgettext"):
+            npgettext = translations.npgettext  # type: ignore
+        else:
+
+            def npgettext(c: str, s: str, p: str, n: int) -> str:
+                return s if n == 1 else p
+
+        self._install_callables(
+            gettext=translations.gettext,
+            ngettext=translations.ngettext,
+            newstyle=newstyle,
+            pgettext=pgettext,
+            npgettext=npgettext,
+        )
+
+    def _install_callables(
+        self,
+        gettext: t.Callable[[str], str],
+        ngettext: t.Callable[[str, str, int], str],
+        newstyle: t.Optional[bool] = None,
+        pgettext: t.Optional[t.Callable[[str, str], str]] = None,
+        npgettext: t.Optional[t.Callable[[str, str, str, int], str]] = None,
+    ) -> None:
         if newstyle is not None:
-            self.environment.newstyle_gettext = newstyle
-        if self.environment.newstyle_gettext:
+            self.environment.newstyle_gettext = newstyle  # type: ignore
+        if self.environment.newstyle_gettext:  # type: ignore
             gettext = _make_new_gettext(gettext)
             ngettext = _make_new_ngettext(ngettext)
+
+            if pgettext is not None:
+                pgettext = _make_new_pgettext(pgettext)
+
+            if npgettext is not None:
+                npgettext = _make_new_npgettext(npgettext)
+
         self.environment.globals.update(
-            gettext=gettext,
-            ngettext=ngettext
+            gettext=gettext, ngettext=ngettext, pgettext=pgettext, npgettext=npgettext
         )
 
-    def _uninstall(self, translations):
-        for key in 'gettext', 'ngettext':
+    def _uninstall(self, translations: "_SupportedTranslations") -> None:
+        for key in ("gettext", "ngettext", "pgettext", "npgettext"):
             self.environment.globals.pop(key, None)
 
-    def _extract(self, source, gettext_functions=GETTEXT_FUNCTIONS):
-        if isinstance(source, string_types):
+    def _extract(
+        self,
+        source: t.Union[str, nodes.Template],
+        gettext_functions: t.Sequence[str] = GETTEXT_FUNCTIONS,
+    ) -> t.Iterator[
+        t.Tuple[int, str, t.Union[t.Optional[str], t.Tuple[t.Optional[str], ...]]]
+    ]:
+        if isinstance(source, str):
             source = self.environment.parse(source)
         return extract_from_ast(source, gettext_functions)
 
-    def parse(self, parser):
+    def parse(self, parser: "Parser") -> t.Union[nodes.Node, t.List[nodes.Node]]:
         """Parse a translatable tag."""
         lineno = next(parser.stream).lineno
-        num_called_num = False
+
+        context = None
+        context_token = parser.stream.next_if("string")
+
+        if context_token is not None:
+            context = context_token.value
 
         # find all the variables referenced.  Additionally a variable can be
         # defined in the body of the trans block too, but this is checked at
         # a later state.
-        plural_expr = None
-        plural_expr_assignment = None
-        variables = {}
-        while parser.stream.current.type != 'block_end':
+        plural_expr: t.Optional[nodes.Expr] = None
+        plural_expr_assignment: t.Optional[nodes.Assign] = None
+        num_called_num = False
+        variables: t.Dict[str, nodes.Expr] = {}
+        trimmed = None
+        while parser.stream.current.type != "block_end":
             if variables:
-                parser.stream.expect('comma')
+                parser.stream.expect("comma")
 
             # skip colon for python compatibility
-            if parser.stream.skip_if('colon'):
+            if parser.stream.skip_if("colon"):
                 break
 
-            name = parser.stream.expect('name')
-            if name.value in variables:
-                parser.fail('translatable variable %r defined twice.' %
-                            name.value, name.lineno,
-                            exc=TemplateAssertionError)
+            token = parser.stream.expect("name")
+            if token.value in variables:
+                parser.fail(
+                    f"translatable variable {token.value!r} defined twice.",
+                    token.lineno,
+                    exc=TemplateAssertionError,
+                )
 
             # expressions
-            if parser.stream.current.type == 'assign':
+            if parser.stream.current.type == "assign":
                 next(parser.stream)
-                variables[name.value] = var = parser.parse_expression()
+                variables[token.value] = var = parser.parse_expression()
+            elif trimmed is None and token.value in ("trimmed", "notrimmed"):
+                trimmed = token.value == "trimmed"
+                continue
             else:
-                variables[name.value] = var = nodes.Name(name.value, 'load')
+                variables[token.value] = var = nodes.Name(token.value, "load")
 
             if plural_expr is None:
                 if isinstance(var, nodes.Call):
-                    plural_expr = nodes.Name('_trans', 'load')
-                    variables[name.value] = plural_expr
+                    plural_expr = nodes.Name("_trans", "load")
+                    variables[token.value] = plural_expr
                     plural_expr_assignment = nodes.Assign(
-                        nodes.Name('_trans', 'store'), var)
+                        nodes.Name("_trans", "store"), var
+                    )
                 else:
                     plural_expr = var
-                num_called_num = name.value == 'num'
+                num_called_num = token.value == "num"
 
-        parser.stream.expect('block_end')
+        parser.stream.expect("block_end")
 
-        plural = plural_names = None
+        plural = None
         have_plural = False
         referenced = set()
 
@@ -265,22 +417,24 @@
         if singular_names:
             referenced.update(singular_names)
             if plural_expr is None:
-                plural_expr = nodes.Name(singular_names[0], 'load')
-                num_called_num = singular_names[0] == 'num'
+                plural_expr = nodes.Name(singular_names[0], "load")
+                num_called_num = singular_names[0] == "num"
 
         # if we have a pluralize block, we parse that too
-        if parser.stream.current.test('name:pluralize'):
+        if parser.stream.current.test("name:pluralize"):
             have_plural = True
             next(parser.stream)
-            if parser.stream.current.type != 'block_end':
-                name = parser.stream.expect('name')
-                if name.value not in variables:
-                    parser.fail('unknown variable %r for pluralization' %
-                                name.value, name.lineno,
-                                exc=TemplateAssertionError)
-                plural_expr = variables[name.value]
-                num_called_num = name.value == 'num'
-            parser.stream.expect('block_end')
+            if parser.stream.current.type != "block_end":
+                token = parser.stream.expect("name")
+                if token.value not in variables:
+                    parser.fail(
+                        f"unknown variable {token.value!r} for pluralization",
+                        token.lineno,
+                        exc=TemplateAssertionError,
+                    )
+                plural_expr = variables[token.value]
+                num_called_num = token.value == "num"
+            parser.stream.expect("block_end")
             plural_names, plural = self._parse_block(parser, False)
             next(parser.stream)
             referenced.update(plural_names)
@@ -288,89 +442,119 @@
             next(parser.stream)
 
         # register free names as simple name expressions
-        for var in referenced:
-            if var not in variables:
-                variables[var] = nodes.Name(var, 'load')
+        for name in referenced:
+            if name not in variables:
+                variables[name] = nodes.Name(name, "load")
 
         if not have_plural:
             plural_expr = None
         elif plural_expr is None:
-            parser.fail('pluralize without variables', lineno)
+            parser.fail("pluralize without variables", lineno)
 
-        node = self._make_node(singular, plural, variables, plural_expr,
-                               bool(referenced),
-                               num_called_num and have_plural)
+        if trimmed is None:
+            trimmed = self.environment.policies["ext.i18n.trimmed"]
+        if trimmed:
+            singular = self._trim_whitespace(singular)
+            if plural:
+                plural = self._trim_whitespace(plural)
+
+        node = self._make_node(
+            singular,
+            plural,
+            context,
+            variables,
+            plural_expr,
+            bool(referenced),
+            num_called_num and have_plural,
+        )
         node.set_lineno(lineno)
         if plural_expr_assignment is not None:
             return [plural_expr_assignment, node]
         else:
             return node
 
-    def _parse_block(self, parser, allow_pluralize):
+    def _trim_whitespace(self, string: str, _ws_re: t.Pattern[str] = _ws_re) -> str:
+        return _ws_re.sub(" ", string.strip())
+
+    def _parse_block(
+        self, parser: "Parser", allow_pluralize: bool
+    ) -> t.Tuple[t.List[str], str]:
         """Parse until the next block tag with a given name."""
         referenced = []
         buf = []
-        while 1:
-            if parser.stream.current.type == 'data':
-                buf.append(parser.stream.current.value.replace('%', '%%'))
+
+        while True:
+            if parser.stream.current.type == "data":
+                buf.append(parser.stream.current.value.replace("%", "%%"))
                 next(parser.stream)
-            elif parser.stream.current.type == 'variable_begin':
+            elif parser.stream.current.type == "variable_begin":
                 next(parser.stream)
-                name = parser.stream.expect('name').value
+                name = parser.stream.expect("name").value
                 referenced.append(name)
-                buf.append('%%(%s)s' % name)
-                parser.stream.expect('variable_end')
-            elif parser.stream.current.type == 'block_begin':
+                buf.append(f"%({name})s")
+                parser.stream.expect("variable_end")
+            elif parser.stream.current.type == "block_begin":
                 next(parser.stream)
-                if parser.stream.current.test('name:endtrans'):
+                if parser.stream.current.test("name:endtrans"):
                     break
-                elif parser.stream.current.test('name:pluralize'):
+                elif parser.stream.current.test("name:pluralize"):
                     if allow_pluralize:
                         break
-                    parser.fail('a translatable section can have only one '
-                                'pluralize section')
-                parser.fail('control structures in translatable sections are '
-                            'not allowed')
+                    parser.fail(
+                        "a translatable section can have only one pluralize section"
+                    )
+                parser.fail(
+                    "control structures in translatable sections are not allowed"
+                )
             elif parser.stream.eos:
-                parser.fail('unclosed translation block')
+                parser.fail("unclosed translation block")
             else:
-                assert False, 'internal parser error'
+                raise RuntimeError("internal parser error")
 
         return referenced, concat(buf)
 
-    def _make_node(self, singular, plural, variables, plural_expr,
-                   vars_referenced, num_called_num):
+    def _make_node(
+        self,
+        singular: str,
+        plural: t.Optional[str],
+        context: t.Optional[str],
+        variables: t.Dict[str, nodes.Expr],
+        plural_expr: t.Optional[nodes.Expr],
+        vars_referenced: bool,
+        num_called_num: bool,
+    ) -> nodes.Output:
         """Generates a useful node from the data provided."""
+        newstyle = self.environment.newstyle_gettext  # type: ignore
+        node: nodes.Expr
+
         # no variables referenced?  no need to escape for old style
         # gettext invocations only if there are vars.
-        if not vars_referenced and not self.environment.newstyle_gettext:
-            singular = singular.replace('%%', '%')
+        if not vars_referenced and not newstyle:
+            singular = singular.replace("%%", "%")
             if plural:
-                plural = plural.replace('%%', '%')
+                plural = plural.replace("%%", "%")
 
-        # singular only:
-        if plural_expr is None:
-            gettext = nodes.Name('gettext', 'load')
-            node = nodes.Call(gettext, [nodes.Const(singular)],
-                              [], None, None)
+        func_name = "gettext"
+        func_args: t.List[nodes.Expr] = [nodes.Const(singular)]
 
-        # singular and plural
-        else:
-            ngettext = nodes.Name('ngettext', 'load')
-            node = nodes.Call(ngettext, [
-                nodes.Const(singular),
-                nodes.Const(plural),
-                plural_expr
-            ], [], None, None)
+        if context is not None:
+            func_args.insert(0, nodes.Const(context))
+            func_name = f"p{func_name}"
+
+        if plural_expr is not None:
+            func_name = f"n{func_name}"
+            func_args.extend((nodes.Const(plural), plural_expr))
+
+        node = nodes.Call(nodes.Name(func_name, "load"), func_args, [], None, None)
 
         # in case newstyle gettext is used, the method is powerful
         # enough to handle the variable expansion and autoescape
         # handling itself
-        if self.environment.newstyle_gettext:
-            for key, value in iteritems(variables):
+        if newstyle:
+            for key, value in variables.items():
                 # the function adds that later anyways in case num was
                 # called num, so just skip it.
-                if num_called_num and key == 'num':
+                if num_called_num and key == "num":
                     continue
                 node.kwargs.append(nodes.Keyword(key, value))
 
@@ -380,20 +564,26 @@
             # environment with autoescaping turned on
             node = nodes.MarkSafeIfAutoescape(node)
             if variables:
-                node = nodes.Mod(node, nodes.Dict([
-                    nodes.Pair(nodes.Const(key), value)
-                    for key, value in variables.items()
-                ]))
+                node = nodes.Mod(
+                    node,
+                    nodes.Dict(
+                        [
+                            nodes.Pair(nodes.Const(key), value)
+                            for key, value in variables.items()
+                        ]
+                    ),
+                )
         return nodes.Output([node])
 
 
 class ExprStmtExtension(Extension):
-    """Adds a `do` tag to Jinja2 that works like the print statement just
+    """Adds a `do` tag to Jinja that works like the print statement just
     that it doesn't print the return value.
     """
-    tags = set(['do'])
 
-    def parse(self, parser):
+    tags = {"do"}
+
+    def parse(self, parser: "Parser") -> nodes.ExprStmt:
         node = nodes.ExprStmt(lineno=next(parser.stream).lineno)
         node.node = parser.parse_tuple()
         return node
@@ -401,52 +591,63 @@
 
 class LoopControlExtension(Extension):
     """Adds break and continue to the template engine."""
-    tags = set(['break', 'continue'])
 
-    def parse(self, parser):
+    tags = {"break", "continue"}
+
+    def parse(self, parser: "Parser") -> t.Union[nodes.Break, nodes.Continue]:
         token = next(parser.stream)
-        if token.value == 'break':
+        if token.value == "break":
             return nodes.Break(lineno=token.lineno)
         return nodes.Continue(lineno=token.lineno)
 
 
-class WithExtension(Extension):
-    """Adds support for a django-like with block."""
-    tags = set(['with'])
+class DebugExtension(Extension):
+    """A ``{% debug %}`` tag that dumps the available variables,
+    filters, and tests.
 
-    def parse(self, parser):
-        node = nodes.Scope(lineno=next(parser.stream).lineno)
-        assignments = []
-        while parser.stream.current.type != 'block_end':
-            lineno = parser.stream.current.lineno
-            if assignments:
-                parser.stream.expect('comma')
-            target = parser.parse_assign_target()
-            parser.stream.expect('assign')
-            expr = parser.parse_expression()
-            assignments.append(nodes.Assign(target, expr, lineno=lineno))
-        node.body = assignments + \
-            list(parser.parse_statements(('name:endwith',),
-                                         drop_needle=True))
-        return node
+    .. code-block:: html+jinja
+
+        <pre>{% debug %}</pre>
+
+    .. code-block:: text
+
+        {'context': {'cycler': <class 'jinja2.utils.Cycler'>,
+                     ...,
+                     'namespace': <class 'jinja2.utils.Namespace'>},
+         'filters': ['abs', 'attr', 'batch', 'capitalize', 'center', 'count', 'd',
+                     ..., 'urlencode', 'urlize', 'wordcount', 'wordwrap', 'xmlattr'],
+         'tests': ['!=', '<', '<=', '==', '>', '>=', 'callable', 'defined',
+                   ..., 'odd', 'sameas', 'sequence', 'string', 'undefined', 'upper']}
+
+    .. versionadded:: 2.11.0
+    """
+
+    tags = {"debug"}
+
+    def parse(self, parser: "Parser") -> nodes.Output:
+        lineno = parser.stream.expect("name:debug").lineno
+        context = nodes.ContextReference()
+        result = self.call_method("_render", [context], lineno=lineno)
+        return nodes.Output([result], lineno=lineno)
+
+    def _render(self, context: Context) -> str:
+        result = {
+            "context": context.get_all(),
+            "filters": sorted(self.environment.filters.keys()),
+            "tests": sorted(self.environment.tests.keys()),
+        }
+
+        # Set the depth since the intent is to show the top few names.
+        return pprint.pformat(result, depth=3, compact=True)
 
 
-class AutoEscapeExtension(Extension):
-    """Changes auto escape rules for a scope."""
-    tags = set(['autoescape'])
-
-    def parse(self, parser):
-        node = nodes.ScopedEvalContextModifier(lineno=next(parser.stream).lineno)
-        node.options = [
-            nodes.Keyword('autoescape', parser.parse_expression())
-        ]
-        node.body = parser.parse_statements(('name:endautoescape',),
-                                            drop_needle=True)
-        return nodes.Scope([node])
-
-
-def extract_from_ast(node, gettext_functions=GETTEXT_FUNCTIONS,
-                     babel_style=True):
+def extract_from_ast(
+    ast: nodes.Template,
+    gettext_functions: t.Sequence[str] = GETTEXT_FUNCTIONS,
+    babel_style: bool = True,
+) -> t.Iterator[
+    t.Tuple[int, str, t.Union[t.Optional[str], t.Tuple[t.Optional[str], ...]]]
+]:
     """Extract localizable strings from the given template node.  Per
     default this function returns matches in babel style that means non string
     parameters as well as keyword arguments are returned as `None`.  This
@@ -474,27 +675,31 @@
     * ``lineno`` is the number of the line on which the string was found,
     * ``function`` is the name of the ``gettext`` function used (if the
       string was extracted from embedded Python code), and
-    *  ``message`` is the string itself (a ``unicode`` object, or a tuple
-       of ``unicode`` objects for functions with multiple string arguments).
+    *   ``message`` is the string, or a tuple of strings for functions
+         with multiple string arguments.
 
     This extraction function operates on the AST and is because of that unable
     to extract any comments.  For comment support you have to use the babel
     extraction interface or extract comments yourself.
     """
-    for node in node.find_all(nodes.Call):
-        if not isinstance(node.node, nodes.Name) or \
-           node.node.name not in gettext_functions:
+    out: t.Union[t.Optional[str], t.Tuple[t.Optional[str], ...]]
+
+    for node in ast.find_all(nodes.Call):
+        if (
+            not isinstance(node.node, nodes.Name)
+            or node.node.name not in gettext_functions
+        ):
             continue
 
-        strings = []
+        strings: t.List[t.Optional[str]] = []
+
         for arg in node.args:
-            if isinstance(arg, nodes.Const) and \
-               isinstance(arg.value, string_types):
+            if isinstance(arg, nodes.Const) and isinstance(arg.value, str):
                 strings.append(arg.value)
             else:
                 strings.append(None)
 
-        for arg in node.kwargs:
+        for _ in node.kwargs:
             strings.append(None)
         if node.dyn_args is not None:
             strings.append(None)
@@ -502,35 +707,40 @@
             strings.append(None)
 
         if not babel_style:
-            strings = tuple(x for x in strings if x is not None)
-            if not strings:
+            out = tuple(x for x in strings if x is not None)
+
+            if not out:
                 continue
         else:
             if len(strings) == 1:
-                strings = strings[0]
+                out = strings[0]
             else:
-                strings = tuple(strings)
-        yield node.lineno, node.node.name, strings
+                out = tuple(strings)
+
+        yield node.lineno, node.node.name, out
 
 
-class _CommentFinder(object):
+class _CommentFinder:
     """Helper class to find comments in a token stream.  Can only
     find comments for gettext calls forwards.  Once the comment
     from line 4 is found, a comment for line 1 will not return a
     usable value.
     """
 
-    def __init__(self, tokens, comment_tags):
+    def __init__(
+        self, tokens: t.Sequence[t.Tuple[int, str, str]], comment_tags: t.Sequence[str]
+    ) -> None:
         self.tokens = tokens
         self.comment_tags = comment_tags
         self.offset = 0
         self.last_lineno = 0
 
-    def find_backwards(self, offset):
+    def find_backwards(self, offset: int) -> t.List[str]:
         try:
-            for _, token_type, token_value in \
-                    reversed(self.tokens[self.offset:offset]):
-                if token_type in ('comment', 'linecomment'):
+            for _, token_type, token_value in reversed(
+                self.tokens[self.offset : offset]
+            ):
+                if token_type in ("comment", "linecomment"):
                     try:
                         prefix, comment = token_value.split(None, 1)
                     except ValueError:
@@ -541,22 +751,31 @@
         finally:
             self.offset = offset
 
-    def find_comments(self, lineno):
+    def find_comments(self, lineno: int) -> t.List[str]:
         if not self.comment_tags or self.last_lineno > lineno:
             return []
-        for idx, (token_lineno, _, _) in enumerate(self.tokens[self.offset:]):
+        for idx, (token_lineno, _, _) in enumerate(self.tokens[self.offset :]):
             if token_lineno > lineno:
                 return self.find_backwards(self.offset + idx)
         return self.find_backwards(len(self.tokens))
 
 
-def babel_extract(fileobj, keywords, comment_tags, options):
+def babel_extract(
+    fileobj: t.BinaryIO,
+    keywords: t.Sequence[str],
+    comment_tags: t.Sequence[str],
+    options: t.Dict[str, t.Any],
+) -> t.Iterator[
+    t.Tuple[
+        int, str, t.Union[t.Optional[str], t.Tuple[t.Optional[str], ...]], t.List[str]
+    ]
+]:
     """Babel extraction method for Jinja templates.
 
     .. versionchanged:: 2.3
        Basic support for translation comments was added.  If `comment_tags`
        is now set to a list of keywords for extraction, the extractor will
-       try to find the best preceeding comment that begins with one of the
+       try to find the best preceding comment that begins with one of the
        keywords.  For best results, make sure to not have more than one
        gettext call in one line of code and the matching comment in the
        same line or the line before.
@@ -578,46 +797,51 @@
     :return: an iterator over ``(lineno, funcname, message, comments)`` tuples.
              (comments will be empty currently)
     """
-    extensions = set()
-    for extension in options.get('extensions', '').split(','):
-        extension = extension.strip()
-        if not extension:
+    extensions: t.Dict[t.Type[Extension], None] = {}
+
+    for extension_name in options.get("extensions", "").split(","):
+        extension_name = extension_name.strip()
+
+        if not extension_name:
             continue
-        extensions.add(import_string(extension))
+
+        extensions[import_string(extension_name)] = None
+
     if InternationalizationExtension not in extensions:
-        extensions.add(InternationalizationExtension)
+        extensions[InternationalizationExtension] = None
 
-    def getbool(options, key, default=False):
-        return options.get(key, str(default)).lower() in \
-            ('1', 'on', 'yes', 'true')
+    def getbool(options: t.Mapping[str, str], key: str, default: bool = False) -> bool:
+        return options.get(key, str(default)).lower() in {"1", "on", "yes", "true"}
 
-    silent = getbool(options, 'silent', True)
+    silent = getbool(options, "silent", True)
     environment = Environment(
-        options.get('block_start_string', BLOCK_START_STRING),
-        options.get('block_end_string', BLOCK_END_STRING),
-        options.get('variable_start_string', VARIABLE_START_STRING),
-        options.get('variable_end_string', VARIABLE_END_STRING),
-        options.get('comment_start_string', COMMENT_START_STRING),
-        options.get('comment_end_string', COMMENT_END_STRING),
-        options.get('line_statement_prefix') or LINE_STATEMENT_PREFIX,
-        options.get('line_comment_prefix') or LINE_COMMENT_PREFIX,
-        getbool(options, 'trim_blocks', TRIM_BLOCKS),
-        getbool(options, 'lstrip_blocks', LSTRIP_BLOCKS),
-        NEWLINE_SEQUENCE,
-        getbool(options, 'keep_trailing_newline', KEEP_TRAILING_NEWLINE),
-        frozenset(extensions),
+        options.get("block_start_string", defaults.BLOCK_START_STRING),
+        options.get("block_end_string", defaults.BLOCK_END_STRING),
+        options.get("variable_start_string", defaults.VARIABLE_START_STRING),
+        options.get("variable_end_string", defaults.VARIABLE_END_STRING),
+        options.get("comment_start_string", defaults.COMMENT_START_STRING),
+        options.get("comment_end_string", defaults.COMMENT_END_STRING),
+        options.get("line_statement_prefix") or defaults.LINE_STATEMENT_PREFIX,
+        options.get("line_comment_prefix") or defaults.LINE_COMMENT_PREFIX,
+        getbool(options, "trim_blocks", defaults.TRIM_BLOCKS),
+        getbool(options, "lstrip_blocks", defaults.LSTRIP_BLOCKS),
+        defaults.NEWLINE_SEQUENCE,
+        getbool(options, "keep_trailing_newline", defaults.KEEP_TRAILING_NEWLINE),
+        tuple(extensions),
         cache_size=0,
-        auto_reload=False
+        auto_reload=False,
     )
 
-    if getbool(options, 'newstyle_gettext'):
-        environment.newstyle_gettext = True
+    if getbool(options, "trimmed"):
+        environment.policies["ext.i18n.trimmed"] = True
+    if getbool(options, "newstyle_gettext"):
+        environment.newstyle_gettext = True  # type: ignore
 
-    source = fileobj.read().decode(options.get('encoding', 'utf-8'))
+    source = fileobj.read().decode(options.get("encoding", "utf-8"))
     try:
         node = environment.parse(source)
         tokens = list(environment.lex(environment.preprocess(source)))
-    except TemplateSyntaxError as e:
+    except TemplateSyntaxError:
         if not silent:
             raise
         # skip templates with syntax errors
@@ -632,5 +856,4 @@
 i18n = InternationalizationExtension
 do = ExprStmtExtension
 loopcontrols = LoopControlExtension
-with_ = WithExtension
-autoescape = AutoEscapeExtension
+debug = DebugExtension

filters.py

diff --git a/filters.py b/filters.py
index fd0db04..ed07c4c 100644
--- a/filters.py
+++ b/filters.py
@@ -1,104 +1,181 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.filters
-    ~~~~~~~~~~~~~~
-
-    Bundled jinja filters.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import re
+"""Built-in template filters used with the ``|`` operator."""
 import math
-
-from random import choice
-from operator import itemgetter
+import random
+import re
+import typing
+import typing as t
+from collections import abc
+from itertools import chain
 from itertools import groupby
-from jinja2.utils import Markup, escape, pformat, urlize, soft_unicode, \
-     unicode_urlencode
-from jinja2.runtime import Undefined
-from jinja2.exceptions import FilterArgumentError
-from jinja2._compat import next, imap, string_types, text_type, iteritems
+
+from markupsafe import escape
+from markupsafe import Markup
+from markupsafe import soft_str
+
+from .async_utils import async_variant
+from .async_utils import auto_aiter
+from .async_utils import auto_await
+from .async_utils import auto_to_list
+from .exceptions import FilterArgumentError
+from .runtime import Undefined
+from .utils import htmlsafe_json_dumps
+from .utils import pass_context
+from .utils import pass_environment
+from .utils import pass_eval_context
+from .utils import pformat
+from .utils import url_quote
+from .utils import urlize
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .environment import Environment
+    from .nodes import EvalContext
+    from .runtime import Context
+    from .sandbox import SandboxedEnvironment  # noqa: F401
+
+    class HasHTML(te.Protocol):
+        def __html__(self) -> str:
+            pass
 
 
-_word_re = re.compile(r'\w+(?u)')
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
+K = t.TypeVar("K")
+V = t.TypeVar("V")
 
 
-def contextfilter(f):
-    """Decorator for marking context dependent filters. The current
-    :class:`Context` will be passed as first argument.
-    """
-    f.contextfilter = True
-    return f
+def ignore_case(value: V) -> V:
+    """For use as a postprocessor for :func:`make_attrgetter`. Converts strings
+    to lowercase and returns other types as-is."""
+    if isinstance(value, str):
+        return t.cast(V, value.lower())
+
+    return value
 
 
-def evalcontextfilter(f):
-    """Decorator for marking eval-context dependent filters.  An eval
-    context object is passed as first argument.  For more information
-    about the eval context, see :ref:`eval-context`.
-
-    .. versionadded:: 2.4
-    """
-    f.evalcontextfilter = True
-    return f
-
-
-def environmentfilter(f):
-    """Decorator for marking evironment dependent filters.  The current
-    :class:`Environment` is passed to the filter as first argument.
-    """
-    f.environmentfilter = True
-    return f
-
-
-def make_attrgetter(environment, attribute):
+def make_attrgetter(
+    environment: "Environment",
+    attribute: t.Optional[t.Union[str, int]],
+    postprocess: t.Optional[t.Callable[[t.Any], t.Any]] = None,
+    default: t.Optional[t.Any] = None,
+) -> t.Callable[[t.Any], t.Any]:
     """Returns a callable that looks up the given attribute from a
     passed object with the rules of the environment.  Dots are allowed
     to access attributes of attributes.  Integer parts in paths are
     looked up as integers.
     """
-    if not isinstance(attribute, string_types) \
-       or ('.' not in attribute and not attribute.isdigit()):
-        return lambda x: environment.getitem(x, attribute)
-    attribute = attribute.split('.')
-    def attrgetter(item):
-        for part in attribute:
-            if part.isdigit():
-                part = int(part)
+    parts = _prepare_attribute_parts(attribute)
+
+    def attrgetter(item: t.Any) -> t.Any:
+        for part in parts:
             item = environment.getitem(item, part)
+
+            if default is not None and isinstance(item, Undefined):
+                item = default
+
+        if postprocess is not None:
+            item = postprocess(item)
+
         return item
+
     return attrgetter
 
 
-def do_forceescape(value):
+def make_multi_attrgetter(
+    environment: "Environment",
+    attribute: t.Optional[t.Union[str, int]],
+    postprocess: t.Optional[t.Callable[[t.Any], t.Any]] = None,
+) -> t.Callable[[t.Any], t.List[t.Any]]:
+    """Returns a callable that looks up the given comma separated
+    attributes from a passed object with the rules of the environment.
+    Dots are allowed to access attributes of each attribute.  Integer
+    parts in paths are looked up as integers.
+
+    The value returned by the returned callable is a list of extracted
+    attribute values.
+
+    Examples of attribute: "attr1,attr2", "attr1.inner1.0,attr2.inner2.0", etc.
+    """
+    if isinstance(attribute, str):
+        split: t.Sequence[t.Union[str, int, None]] = attribute.split(",")
+    else:
+        split = [attribute]
+
+    parts = [_prepare_attribute_parts(item) for item in split]
+
+    def attrgetter(item: t.Any) -> t.List[t.Any]:
+        items = [None] * len(parts)
+
+        for i, attribute_part in enumerate(parts):
+            item_i = item
+
+            for part in attribute_part:
+                item_i = environment.getitem(item_i, part)
+
+            if postprocess is not None:
+                item_i = postprocess(item_i)
+
+            items[i] = item_i
+
+        return items
+
+    return attrgetter
+
+
+def _prepare_attribute_parts(
+    attr: t.Optional[t.Union[str, int]]
+) -> t.List[t.Union[str, int]]:
+    if attr is None:
+        return []
+
+    if isinstance(attr, str):
+        return [int(x) if x.isdigit() else x for x in attr.split(".")]
+
+    return [attr]
+
+
+def do_forceescape(value: "t.Union[str, HasHTML]") -> Markup:
     """Enforce HTML escaping.  This will probably double escape variables."""
-    if hasattr(value, '__html__'):
-        value = value.__html__()
-    return escape(text_type(value))
+    if hasattr(value, "__html__"):
+        value = t.cast("HasHTML", value).__html__()
+
+    return escape(str(value))
 
 
-def do_urlencode(value):
-    """Escape strings for use in URLs (uses UTF-8 encoding).  It accepts both
-    dictionaries and regular strings as well as pairwise iterables.
+def do_urlencode(
+    value: t.Union[str, t.Mapping[str, t.Any], t.Iterable[t.Tuple[str, t.Any]]]
+) -> str:
+    """Quote data for use in a URL path or query using UTF-8.
+
+    Basic wrapper around :func:`urllib.parse.quote` when given a
+    string, or :func:`urllib.parse.urlencode` for a dict or iterable.
+
+    :param value: Data to quote. A string will be quoted directly. A
+        dict or iterable of ``(key, value)`` pairs will be joined as a
+        query string.
+
+    When given a string, "/" is not quoted. HTTP servers treat "/" and
+    "%2F" equivalently in paths. If you need quoted slashes, use the
+    ``|replace("/", "%2F")`` filter.
 
     .. versionadded:: 2.7
     """
-    itemiter = None
+    if isinstance(value, str) or not isinstance(value, abc.Iterable):
+        return url_quote(value)
+
     if isinstance(value, dict):
-        itemiter = iteritems(value)
-    elif not isinstance(value, string_types):
-        try:
-            itemiter = iter(value)
-        except TypeError:
-            pass
-    if itemiter is None:
-        return unicode_urlencode(value)
-    return u'&'.join(unicode_urlencode(k) + '=' +
-                     unicode_urlencode(v) for k, v in itemiter)
+        items: t.Iterable[t.Tuple[str, t.Any]] = value.items()
+    else:
+        items = value  # type: ignore
+
+    return "&".join(
+        f"{url_quote(k, for_qs=True)}={url_quote(v, for_qs=True)}" for k, v in items
+    )
 
 
-@evalcontextfilter
-def do_replace(eval_ctx, s, old, new, count=None):
+@pass_eval_context
+def do_replace(
+    eval_ctx: "EvalContext", s: str, old: str, new: str, count: t.Optional[int] = None
+) -> str:
     """Return a copy of the value with all occurrences of a substring
     replaced with a new one. The first argument is the substring
     that should be replaced, the second is the replacement string.
@@ -115,28 +192,66 @@
     """
     if count is None:
         count = -1
+
     if not eval_ctx.autoescape:
-        return text_type(s).replace(text_type(old), text_type(new), count)
-    if hasattr(old, '__html__') or hasattr(new, '__html__') and \
-       not hasattr(s, '__html__'):
+        return str(s).replace(str(old), str(new), count)
+
+    if (
+        hasattr(old, "__html__")
+        or hasattr(new, "__html__")
+        and not hasattr(s, "__html__")
+    ):
         s = escape(s)
     else:
-        s = soft_unicode(s)
-    return s.replace(soft_unicode(old), soft_unicode(new), count)
+        s = soft_str(s)
+
+    return s.replace(soft_str(old), soft_str(new), count)
 
 
-def do_upper(s):
+def do_upper(s: str) -> str:
     """Convert a value to uppercase."""
-    return soft_unicode(s).upper()
+    return soft_str(s).upper()
 
 
-def do_lower(s):
+def do_lower(s: str) -> str:
     """Convert a value to lowercase."""
-    return soft_unicode(s).lower()
+    return soft_str(s).lower()
 
 
-@evalcontextfilter
-def do_xmlattr(_eval_ctx, d, autospace=True):
+def do_items(value: t.Union[t.Mapping[K, V], Undefined]) -> t.Iterator[t.Tuple[K, V]]:
+    """Return an iterator over the ``(key, value)`` items of a mapping.
+
+    ``x|items`` is the same as ``x.items()``, except if ``x`` is
+    undefined an empty iterator is returned.
+
+    This filter is useful if you expect the template to be rendered with
+    an implementation of Jinja in another programming language that does
+    not have a ``.items()`` method on its mapping type.
+
+    .. code-block:: html+jinja
+
+        <dl>
+        {% for key, value in my_dict|items %}
+            <dt>{{ key }}
+            <dd>{{ value }}
+        {% endfor %}
+        </dl>
+
+    .. versionadded:: 3.1
+    """
+    if isinstance(value, Undefined):
+        return
+
+    if not isinstance(value, abc.Mapping):
+        raise TypeError("Can only get item pairs from a mapping.")
+
+    yield from value.items()
+
+
+@pass_eval_context
+def do_xmlattr(
+    eval_ctx: "EvalContext", d: t.Mapping[str, t.Any], autospace: bool = True
+) -> str:
     """Create an SGML/XML attribute string based on the items in a dict.
     All values that are neither `none` nor `undefined` are automatically
     escaped:
@@ -159,113 +274,239 @@
     As you can see it automatically prepends a space in front of the item
     if the filter returned something unless the second parameter is false.
     """
-    rv = u' '.join(
-        u'%s="%s"' % (escape(key), escape(value))
-        for key, value in iteritems(d)
+    rv = " ".join(
+        f'{escape(key)}="{escape(value)}"'
+        for key, value in d.items()
         if value is not None and not isinstance(value, Undefined)
     )
+
     if autospace and rv:
-        rv = u' ' + rv
-    if _eval_ctx.autoescape:
+        rv = " " + rv
+
+    if eval_ctx.autoescape:
         rv = Markup(rv)
+
     return rv
 
 
-def do_capitalize(s):
+def do_capitalize(s: str) -> str:
     """Capitalize a value. The first character will be uppercase, all others
     lowercase.
     """
-    return soft_unicode(s).capitalize()
+    return soft_str(s).capitalize()
 
 
-def do_title(s):
+_word_beginning_split_re = re.compile(r"([-\s({\[<]+)")
+
+
+def do_title(s: str) -> str:
     """Return a titlecased version of the value. I.e. words will start with
     uppercase letters, all remaining characters are lowercase.
     """
-    rv = []
-    for item in re.compile(r'([-\s]+)(?u)').split(s):
-        if not item:
-            continue
-        rv.append(item[0].upper() + item[1:].lower())
-    return ''.join(rv)
+    return "".join(
+        [
+            item[0].upper() + item[1:].lower()
+            for item in _word_beginning_split_re.split(soft_str(s))
+            if item
+        ]
+    )
 
 
-def do_dictsort(value, case_sensitive=False, by='key'):
-    """Sort a dict and yield (key, value) pairs. Because python dicts are
-    unsorted you may want to use this function to order them by either
-    key or value:
+def do_dictsort(
+    value: t.Mapping[K, V],
+    case_sensitive: bool = False,
+    by: 'te.Literal["key", "value"]' = "key",
+    reverse: bool = False,
+) -> t.List[t.Tuple[K, V]]:
+    """Sort a dict and yield (key, value) pairs. Python dicts may not
+    be in the order you want to display them in, so sort them first.
 
     .. sourcecode:: jinja
 
-        {% for item in mydict|dictsort %}
+        {% for key, value in mydict|dictsort %}
             sort the dict by key, case insensitive
 
-        {% for item in mydict|dictsort(true) %}
+        {% for key, value in mydict|dictsort(reverse=true) %}
+            sort the dict by key, case insensitive, reverse order
+
+        {% for key, value in mydict|dictsort(true) %}
             sort the dict by key, case sensitive
 
-        {% for item in mydict|dictsort(false, 'value') %}
-            sort the dict by key, case insensitive, sorted
-            normally and ordered by value.
+        {% for key, value in mydict|dictsort(false, 'value') %}
+            sort the dict by value, case insensitive
     """
-    if by == 'key':
+    if by == "key":
         pos = 0
-    elif by == 'value':
+    elif by == "value":
         pos = 1
     else:
-        raise FilterArgumentError('You can only sort by either '
-                                  '"key" or "value"')
-    def sort_func(item):
+        raise FilterArgumentError('You can only sort by either "key" or "value"')
+
+    def sort_func(item: t.Tuple[t.Any, t.Any]) -> t.Any:
         value = item[pos]
-        if isinstance(value, string_types) and not case_sensitive:
-            value = value.lower()
+
+        if not case_sensitive:
+            value = ignore_case(value)
+
         return value
 
-    return sorted(value.items(), key=sort_func)
+    return sorted(value.items(), key=sort_func, reverse=reverse)
 
 
-@environmentfilter
-def do_sort(environment, value, reverse=False, case_sensitive=False,
-            attribute=None):
-    """Sort an iterable.  Per default it sorts ascending, if you pass it
-    true as first argument it will reverse the sorting.
-
-    If the iterable is made of strings the third parameter can be used to
-    control the case sensitiveness of the comparison which is disabled by
-    default.
+@pass_environment
+def do_sort(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    reverse: bool = False,
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.List[V]":
+    """Sort an iterable using Python's :func:`sorted`.
 
     .. sourcecode:: jinja
 
-        {% for item in iterable|sort %}
+        {% for city in cities|sort %}
             ...
         {% endfor %}
 
-    It is also possible to sort by an attribute (for example to sort
-    by the date of an object) by specifying the `attribute` parameter:
+    :param reverse: Sort descending instead of ascending.
+    :param case_sensitive: When sorting strings, sort upper and lower
+        case separately.
+    :param attribute: When sorting objects or dicts, an attribute or
+        key to sort by. Can use dot notation like ``"address.city"``.
+        Can be a list of attributes like ``"age,name"``.
+
+    The sort is stable, it does not change the relative order of
+    elements that compare equal. This makes it is possible to chain
+    sorts on different attributes and ordering.
 
     .. sourcecode:: jinja
 
-        {% for item in iterable|sort(attribute='date') %}
+        {% for user in users|sort(attribute="name")
+            |sort(reverse=true, attribute="age") %}
             ...
         {% endfor %}
 
+    As a shortcut to chaining when the direction is the same for all
+    attributes, pass a comma separate list of attributes.
+
+    .. sourcecode:: jinja
+
+        {% for user in users|sort(attribute="age,name") %}
+            ...
+        {% endfor %}
+
+    .. versionchanged:: 2.11.0
+        The ``attribute`` parameter can be a comma separated list of
+        attributes, e.g. ``"age,name"``.
+
     .. versionchanged:: 2.6
-       The `attribute` parameter was added.
+       The ``attribute`` parameter was added.
     """
-    if not case_sensitive:
-        def sort_func(item):
-            if isinstance(item, string_types):
-                item = item.lower()
-            return item
-    else:
-        sort_func = None
-    if attribute is not None:
-        getter = make_attrgetter(environment, attribute)
-        def sort_func(item, processor=sort_func or (lambda x: x)):
-            return processor(getter(item))
-    return sorted(value, key=sort_func, reverse=reverse)
+    key_func = make_multi_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    return sorted(value, key=key_func, reverse=reverse)
 
 
-def do_default(value, default_value=u'', boolean=False):
+@pass_environment
+def do_unique(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Iterator[V]":
+    """Returns a list of unique items from the given iterable.
+
+    .. sourcecode:: jinja
+
+        {{ ['foo', 'bar', 'foobar', 'FooBar']|unique|list }}
+            -> ['foo', 'bar', 'foobar']
+
+    The unique items are yielded in the same order as their first occurrence in
+    the iterable passed to the filter.
+
+    :param case_sensitive: Treat upper and lower case strings as distinct.
+    :param attribute: Filter objects with unique values for this attribute.
+    """
+    getter = make_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    seen = set()
+
+    for item in value:
+        key = getter(item)
+
+        if key not in seen:
+            seen.add(key)
+            yield item
+
+
+def _min_or_max(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    func: "t.Callable[..., V]",
+    case_sensitive: bool,
+    attribute: t.Optional[t.Union[str, int]],
+) -> "t.Union[V, Undefined]":
+    it = iter(value)
+
+    try:
+        first = next(it)
+    except StopIteration:
+        return environment.undefined("No aggregated item, sequence was empty.")
+
+    key_func = make_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    return func(chain([first], it), key=key_func)
+
+
+@pass_environment
+def do_min(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Union[V, Undefined]":
+    """Return the smallest item from the sequence.
+
+    .. sourcecode:: jinja
+
+        {{ [1, 2, 3]|min }}
+            -> 1
+
+    :param case_sensitive: Treat upper and lower case strings as distinct.
+    :param attribute: Get the object with the min value of this attribute.
+    """
+    return _min_or_max(environment, value, min, case_sensitive, attribute)
+
+
+@pass_environment
+def do_max(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Union[V, Undefined]":
+    """Return the largest item from the sequence.
+
+    .. sourcecode:: jinja
+
+        {{ [1, 2, 3]|max }}
+            -> 3
+
+    :param case_sensitive: Treat upper and lower case strings as distinct.
+    :param attribute: Get the object with the max value of this attribute.
+    """
+    return _min_or_max(environment, value, max, case_sensitive, attribute)
+
+
+def do_default(
+    value: V,
+    default_value: V = "",  # type: ignore
+    boolean: bool = False,
+) -> V:
     """If the value is undefined it will return the passed default value,
     otherwise the value of the variable:
 
@@ -281,14 +522,26 @@
     .. sourcecode:: jinja
 
         {{ ''|default('the string was empty', true) }}
+
+    .. versionchanged:: 2.11
+       It's now possible to configure the :class:`~jinja2.Environment` with
+       :class:`~jinja2.ChainableUndefined` to make the `default` filter work
+       on nested elements and attributes that may contain undefined values
+       in the chain without getting an :exc:`~jinja2.UndefinedError`.
     """
     if isinstance(value, Undefined) or (boolean and not value):
         return default_value
+
     return value
 
 
-@evalcontextfilter
-def do_join(eval_ctx, value, d=u'', attribute=None):
+@pass_eval_context
+def sync_do_join(
+    eval_ctx: "EvalContext",
+    value: t.Iterable,
+    d: str = "",
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> str:
     """Return a string which is the concatenation of the strings in the
     sequence. The separator between elements is an empty string per
     default, you can define it with the optional parameter:
@@ -311,204 +564,396 @@
        The `attribute` parameter was added.
     """
     if attribute is not None:
-        value = imap(make_attrgetter(eval_ctx.environment, attribute), value)
+        value = map(make_attrgetter(eval_ctx.environment, attribute), value)
 
-    # no automatic escaping?  joining is a lot eaiser then
+    # no automatic escaping?  joining is a lot easier then
     if not eval_ctx.autoescape:
-        return text_type(d).join(imap(text_type, value))
+        return str(d).join(map(str, value))
 
     # if the delimiter doesn't have an html representation we check
     # if any of the items has.  If yes we do a coercion to Markup
-    if not hasattr(d, '__html__'):
+    if not hasattr(d, "__html__"):
         value = list(value)
         do_escape = False
+
         for idx, item in enumerate(value):
-            if hasattr(item, '__html__'):
+            if hasattr(item, "__html__"):
                 do_escape = True
             else:
-                value[idx] = text_type(item)
+                value[idx] = str(item)
+
         if do_escape:
             d = escape(d)
         else:
-            d = text_type(d)
+            d = str(d)
+
         return d.join(value)
 
     # no html involved, to normal joining
-    return soft_unicode(d).join(imap(soft_unicode, value))
+    return soft_str(d).join(map(soft_str, value))
 
 
-def do_center(value, width=80):
+@async_variant(sync_do_join)  # type: ignore
+async def do_join(
+    eval_ctx: "EvalContext",
+    value: t.Union[t.AsyncIterable, t.Iterable],
+    d: str = "",
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> str:
+    return sync_do_join(eval_ctx, await auto_to_list(value), d, attribute)
+
+
+def do_center(value: str, width: int = 80) -> str:
     """Centers the value in a field of a given width."""
-    return text_type(value).center(width)
+    return soft_str(value).center(width)
 
 
-@environmentfilter
-def do_first(environment, seq):
+@pass_environment
+def sync_do_first(
+    environment: "Environment", seq: "t.Iterable[V]"
+) -> "t.Union[V, Undefined]":
     """Return the first item of a sequence."""
     try:
         return next(iter(seq))
     except StopIteration:
-        return environment.undefined('No first item, sequence was empty.')
+        return environment.undefined("No first item, sequence was empty.")
 
 
-@environmentfilter
-def do_last(environment, seq):
-    """Return the last item of a sequence."""
+@async_variant(sync_do_first)  # type: ignore
+async def do_first(
+    environment: "Environment", seq: "t.Union[t.AsyncIterable[V], t.Iterable[V]]"
+) -> "t.Union[V, Undefined]":
+    try:
+        return await auto_aiter(seq).__anext__()
+    except StopAsyncIteration:
+        return environment.undefined("No first item, sequence was empty.")
+
+
+@pass_environment
+def do_last(
+    environment: "Environment", seq: "t.Reversible[V]"
+) -> "t.Union[V, Undefined]":
+    """Return the last item of a sequence.
+
+    Note: Does not work with generators. You may want to explicitly
+    convert it to a list:
+
+    .. sourcecode:: jinja
+
+        {{ data | selectattr('name', '==', 'Jinja') | list | last }}
+    """
     try:
         return next(iter(reversed(seq)))
     except StopIteration:
-        return environment.undefined('No last item, sequence was empty.')
+        return environment.undefined("No last item, sequence was empty.")
 
 
-@environmentfilter
-def do_random(environment, seq):
+# No async do_last, it may not be safe in async mode.
+
+
+@pass_context
+def do_random(context: "Context", seq: "t.Sequence[V]") -> "t.Union[V, Undefined]":
     """Return a random item from the sequence."""
     try:
-        return choice(seq)
+        return random.choice(seq)
     except IndexError:
-        return environment.undefined('No random item, sequence was empty.')
+        return context.environment.undefined("No random item, sequence was empty.")
 
 
-def do_filesizeformat(value, binary=False):
+def do_filesizeformat(value: t.Union[str, float, int], binary: bool = False) -> str:
     """Format the value like a 'human-readable' file size (i.e. 13 kB,
     4.1 MB, 102 Bytes, etc).  Per default decimal prefixes are used (Mega,
     Giga, etc.), if the second parameter is set to `True` the binary
     prefixes are used (Mebi, Gibi).
     """
     bytes = float(value)
-    base = binary and 1024 or 1000
+    base = 1024 if binary else 1000
     prefixes = [
-        (binary and 'KiB' or 'kB'),
-        (binary and 'MiB' or 'MB'),
-        (binary and 'GiB' or 'GB'),
-        (binary and 'TiB' or 'TB'),
-        (binary and 'PiB' or 'PB'),
-        (binary and 'EiB' or 'EB'),
-        (binary and 'ZiB' or 'ZB'),
-        (binary and 'YiB' or 'YB')
+        ("KiB" if binary else "kB"),
+        ("MiB" if binary else "MB"),
+        ("GiB" if binary else "GB"),
+        ("TiB" if binary else "TB"),
+        ("PiB" if binary else "PB"),
+        ("EiB" if binary else "EB"),
+        ("ZiB" if binary else "ZB"),
+        ("YiB" if binary else "YB"),
     ]
+
     if bytes == 1:
-        return '1 Byte'
+        return "1 Byte"
     elif bytes < base:
-        return '%d Bytes' % bytes
+        return f"{int(bytes)} Bytes"
     else:
         for i, prefix in enumerate(prefixes):
             unit = base ** (i + 2)
+
             if bytes < unit:
-                return '%.1f %s' % ((base * bytes / unit), prefix)
-        return '%.1f %s' % ((base * bytes / unit), prefix)
+                return f"{base * bytes / unit:.1f} {prefix}"
+
+        return f"{base * bytes / unit:.1f} {prefix}"
 
 
-def do_pprint(value, verbose=False):
-    """Pretty print a variable. Useful for debugging.
+def do_pprint(value: t.Any) -> str:
+    """Pretty print a variable. Useful for debugging."""
+    return pformat(value)
 
-    With Jinja 1.2 onwards you can pass it a parameter.  If this parameter
-    is truthy the output will be more verbose (this requires `pretty`)
+
+_uri_scheme_re = re.compile(r"^([\w.+-]{2,}:(/){0,2})$")
+
+
+@pass_eval_context
+def do_urlize(
+    eval_ctx: "EvalContext",
+    value: str,
+    trim_url_limit: t.Optional[int] = None,
+    nofollow: bool = False,
+    target: t.Optional[str] = None,
+    rel: t.Optional[str] = None,
+    extra_schemes: t.Optional[t.Iterable[str]] = None,
+) -> str:
+    """Convert URLs in text into clickable links.
+
+    This may not recognize links in some situations. Usually, a more
+    comprehensive formatter, such as a Markdown library, is a better
+    choice.
+
+    Works on ``http://``, ``https://``, ``www.``, ``mailto:``, and email
+    addresses. Links with trailing punctuation (periods, commas, closing
+    parentheses) and leading punctuation (opening parentheses) are
+    recognized excluding the punctuation. Email addresses that include
+    header fields are not recognized (for example,
+    ``mailto:address@example.com?cc=copy@example.com``).
+
+    :param value: Original text containing URLs to link.
+    :param trim_url_limit: Shorten displayed URL values to this length.
+    :param nofollow: Add the ``rel=nofollow`` attribute to links.
+    :param target: Add the ``target`` attribute to links.
+    :param rel: Add the ``rel`` attribute to links.
+    :param extra_schemes: Recognize URLs that start with these schemes
+        in addition to the default behavior. Defaults to
+        ``env.policies["urlize.extra_schemes"]``, which defaults to no
+        extra schemes.
+
+    .. versionchanged:: 3.0
+        The ``extra_schemes`` parameter was added.
+
+    .. versionchanged:: 3.0
+        Generate ``https://`` links for URLs without a scheme.
+
+    .. versionchanged:: 3.0
+        The parsing rules were updated. Recognize email addresses with
+        or without the ``mailto:`` scheme. Validate IP addresses. Ignore
+        parentheses and brackets in more cases.
+
+    .. versionchanged:: 2.8
+       The ``target`` parameter was added.
     """
-    return pformat(value, verbose=verbose)
+    policies = eval_ctx.environment.policies
+    rel_parts = set((rel or "").split())
 
+    if nofollow:
+        rel_parts.add("nofollow")
 
-@evalcontextfilter
-def do_urlize(eval_ctx, value, trim_url_limit=None, nofollow=False):
-    """Converts URLs in plain text into clickable links.
+    rel_parts.update((policies["urlize.rel"] or "").split())
+    rel = " ".join(sorted(rel_parts)) or None
 
-    If you pass the filter an additional integer it will shorten the urls
-    to that number. Also a third argument exists that makes the urls
-    "nofollow":
+    if target is None:
+        target = policies["urlize.target"]
 
-    .. sourcecode:: jinja
+    if extra_schemes is None:
+        extra_schemes = policies["urlize.extra_schemes"] or ()
 
-        {{ mytext|urlize(40, true) }}
-            links are shortened to 40 chars and defined with rel="nofollow"
-    """
-    rv = urlize(value, trim_url_limit, nofollow)
+    for scheme in extra_schemes:
+        if _uri_scheme_re.fullmatch(scheme) is None:
+            raise FilterArgumentError(f"{scheme!r} is not a valid URI scheme prefix.")
+
+    rv = urlize(
+        value,
+        trim_url_limit=trim_url_limit,
+        rel=rel,
+        target=target,
+        extra_schemes=extra_schemes,
+    )
+
     if eval_ctx.autoescape:
         rv = Markup(rv)
+
     return rv
 
 
-def do_indent(s, width=4, indentfirst=False):
-    """Return a copy of the passed string, each line indented by
-    4 spaces. The first line is not indented. If you want to
-    change the number of spaces or indent the first line too
-    you can pass additional parameters to the filter:
+def do_indent(
+    s: str, width: t.Union[int, str] = 4, first: bool = False, blank: bool = False
+) -> str:
+    """Return a copy of the string with each line indented by 4 spaces. The
+    first line and blank lines are not indented by default.
 
-    .. sourcecode:: jinja
+    :param width: Number of spaces, or a string, to indent by.
+    :param first: Don't skip indenting the first line.
+    :param blank: Don't skip indenting empty lines.
 
-        {{ mytext|indent(2, true) }}
-            indent by two spaces and indent the first line too.
+    .. versionchanged:: 3.0
+        ``width`` can be a string.
+
+    .. versionchanged:: 2.10
+        Blank lines are not indented by default.
+
+        Rename the ``indentfirst`` argument to ``first``.
     """
-    indention = u' ' * width
-    rv = (u'\n' + indention).join(s.splitlines())
-    if indentfirst:
+    if isinstance(width, str):
+        indention = width
+    else:
+        indention = " " * width
+
+    newline = "\n"
+
+    if isinstance(s, Markup):
+        indention = Markup(indention)
+        newline = Markup(newline)
+
+    s += newline  # this quirk is necessary for splitlines method
+
+    if blank:
+        rv = (newline + indention).join(s.splitlines())
+    else:
+        lines = s.splitlines()
+        rv = lines.pop(0)
+
+        if lines:
+            rv += newline + newline.join(
+                indention + line if line else line for line in lines
+            )
+
+    if first:
         rv = indention + rv
+
     return rv
 
 
-def do_truncate(s, length=255, killwords=False, end='...'):
+@pass_environment
+def do_truncate(
+    env: "Environment",
+    s: str,
+    length: int = 255,
+    killwords: bool = False,
+    end: str = "...",
+    leeway: t.Optional[int] = None,
+) -> str:
     """Return a truncated copy of the string. The length is specified
     with the first parameter which defaults to ``255``. If the second
     parameter is ``true`` the filter will cut the text at length. Otherwise
     it will discard the last word. If the text was in fact
     truncated it will append an ellipsis sign (``"..."``). If you want a
     different ellipsis sign than ``"..."`` you can specify it using the
-    third parameter.
+    third parameter. Strings that only exceed the length by the tolerance
+    margin given in the fourth parameter will not be truncated.
 
     .. sourcecode:: jinja
 
-        {{ "foo bar"|truncate(5) }}
-            -> "foo ..."
-        {{ "foo bar"|truncate(5, True) }}
-            -> "foo b..."
+        {{ "foo bar baz qux"|truncate(9) }}
+            -> "foo..."
+        {{ "foo bar baz qux"|truncate(9, True) }}
+            -> "foo ba..."
+        {{ "foo bar baz qux"|truncate(11) }}
+            -> "foo bar baz qux"
+        {{ "foo bar baz qux"|truncate(11, False, '...', 0) }}
+            -> "foo bar..."
+
+    The default leeway on newer Jinja versions is 5 and was 0 before but
+    can be reconfigured globally.
     """
-    if len(s) <= length:
+    if leeway is None:
+        leeway = env.policies["truncate.leeway"]
+
+    assert length >= len(end), f"expected length >= {len(end)}, got {length}"
+    assert leeway >= 0, f"expected leeway >= 0, got {leeway}"
+
+    if len(s) <= length + leeway:
         return s
-    elif killwords:
-        return s[:length] + end
-    words = s.split(' ')
-    result = []
-    m = 0
-    for word in words:
-        m += len(word) + 1
-        if m > length:
-            break
-        result.append(word)
-    result.append(end)
-    return u' '.join(result)
 
-@environmentfilter
-def do_wordwrap(environment, s, width=79, break_long_words=True,
-                wrapstring=None):
-    """
-    Return a copy of the string passed to the filter wrapped after
-    ``79`` characters.  You can override this default using the first
-    parameter.  If you set the second parameter to `false` Jinja will not
-    split words apart if they are longer than `width`. By default, the newlines
-    will be the default newlines for the environment, but this can be changed
-    using the wrapstring keyword argument.
+    if killwords:
+        return s[: length - len(end)] + end
 
-    .. versionadded:: 2.7
-       Added support for the `wrapstring` parameter.
+    result = s[: length - len(end)].rsplit(" ", 1)[0]
+    return result + end
+
+
+@pass_environment
+def do_wordwrap(
+    environment: "Environment",
+    s: str,
+    width: int = 79,
+    break_long_words: bool = True,
+    wrapstring: t.Optional[str] = None,
+    break_on_hyphens: bool = True,
+) -> str:
+    """Wrap a string to the given width. Existing newlines are treated
+    as paragraphs to be wrapped separately.
+
+    :param s: Original text to wrap.
+    :param width: Maximum length of wrapped lines.
+    :param break_long_words: If a word is longer than ``width``, break
+        it across lines.
+    :param break_on_hyphens: If a word contains hyphens, it may be split
+        across lines.
+    :param wrapstring: String to join each wrapped line. Defaults to
+        :attr:`Environment.newline_sequence`.
+
+    .. versionchanged:: 2.11
+        Existing newlines are treated as paragraphs wrapped separately.
+
+    .. versionchanged:: 2.11
+        Added the ``break_on_hyphens`` parameter.
+
+    .. versionchanged:: 2.7
+        Added the ``wrapstring`` parameter.
     """
-    if not wrapstring:
-        wrapstring = environment.newline_sequence
     import textwrap
-    return wrapstring.join(textwrap.wrap(s, width=width, expand_tabs=False,
-                                   replace_whitespace=False,
-                                   break_long_words=break_long_words))
+
+    if wrapstring is None:
+        wrapstring = environment.newline_sequence
+
+    # textwrap.wrap doesn't consider existing newlines when wrapping.
+    # If the string has a newline before width, wrap will still insert
+    # a newline at width, resulting in a short line. Instead, split and
+    # wrap each paragraph individually.
+    return wrapstring.join(
+        [
+            wrapstring.join(
+                textwrap.wrap(
+                    line,
+                    width=width,
+                    expand_tabs=False,
+                    replace_whitespace=False,
+                    break_long_words=break_long_words,
+                    break_on_hyphens=break_on_hyphens,
+                )
+            )
+            for line in s.splitlines()
+        ]
+    )
 
 
-def do_wordcount(s):
+_word_re = re.compile(r"\w+")
+
+
+def do_wordcount(s: str) -> int:
     """Count the words in that string."""
-    return len(_word_re.findall(s))
+    return len(_word_re.findall(soft_str(s)))
 
 
-def do_int(value, default=0):
+def do_int(value: t.Any, default: int = 0, base: int = 10) -> int:
     """Convert the value into an integer. If the
     conversion doesn't work it will return ``0``. You can
-    override this default using the first parameter.
+    override this default using the first parameter. You
+    can also override the default base (10) in the second
+    parameter, which handles input with prefixes such as
+    0b, 0o and 0x for bases 2, 8 and 16 respectively.
+    The base is ignored for decimal numbers and non-string values.
     """
     try:
+        if isinstance(value, str):
+            return int(value, base)
+
         return int(value)
     except (TypeError, ValueError):
         # this quirk is necessary so that "42.23"|int gives 42.
@@ -518,7 +963,7 @@
             return default
 
 
-def do_float(value, default=0.0):
+def do_float(value: t.Any, default: float = 0.0) -> float:
     """Convert the value into a floating point number. If the
     conversion doesn't work it will return ``0.0``. You can
     override this default using the first parameter.
@@ -529,42 +974,57 @@
         return default
 
 
-def do_format(value, *args, **kwargs):
-    """
-    Apply python string formatting on an object:
+def do_format(value: str, *args: t.Any, **kwargs: t.Any) -> str:
+    """Apply the given values to a `printf-style`_ format string, like
+    ``string % values``.
 
     .. sourcecode:: jinja
 
-        {{ "%s - %s"|format("Hello?", "Foo!") }}
-            -> Hello? - Foo!
+        {{ "%s, %s!"|format(greeting, name) }}
+        Hello, World!
+
+    In most cases it should be more convenient and efficient to use the
+    ``%`` operator or :meth:`str.format`.
+
+    .. code-block:: text
+
+        {{ "%s, %s!" % (greeting, name) }}
+        {{ "{}, {}!".format(greeting, name) }}
+
+    .. _printf-style: https://docs.python.org/library/stdtypes.html
+        #printf-style-string-formatting
     """
     if args and kwargs:
-        raise FilterArgumentError('can\'t handle positional and keyword '
-                                  'arguments at the same time')
-    return soft_unicode(value) % (kwargs or args)
+        raise FilterArgumentError(
+            "can't handle positional and keyword arguments at the same time"
+        )
+
+    return soft_str(value) % (kwargs or args)
 
 
-def do_trim(value):
-    """Strip leading and trailing whitespace."""
-    return soft_unicode(value).strip()
+def do_trim(value: str, chars: t.Optional[str] = None) -> str:
+    """Strip leading and trailing characters, by default whitespace."""
+    return soft_str(value).strip(chars)
 
 
-def do_striptags(value):
-    """Strip SGML/XML tags and replace adjacent whitespace by one space.
-    """
-    if hasattr(value, '__html__'):
-        value = value.__html__()
-    return Markup(text_type(value)).striptags()
+def do_striptags(value: "t.Union[str, HasHTML]") -> str:
+    """Strip SGML/XML tags and replace adjacent whitespace by one space."""
+    if hasattr(value, "__html__"):
+        value = t.cast("HasHTML", value).__html__()
+
+    return Markup(str(value)).striptags()
 
 
-def do_slice(value, slices, fill_with=None):
+def sync_do_slice(
+    value: "t.Collection[V]", slices: int, fill_with: "t.Optional[V]" = None
+) -> "t.Iterator[t.List[V]]":
     """Slice an iterator and return a list of lists containing
     those items. Useful if you want to create a div containing
     three ul tags that represent columns:
 
     .. sourcecode:: html+jinja
 
-        <div class="columwrapper">
+        <div class="columnwrapper">
           {%- for column in items|slice(3) %}
             <ul class="column-{{ loop.index }}">
             {%- for item in column %}
@@ -582,18 +1042,34 @@
     items_per_slice = length // slices
     slices_with_extra = length % slices
     offset = 0
+
     for slice_number in range(slices):
         start = offset + slice_number * items_per_slice
+
         if slice_number < slices_with_extra:
             offset += 1
+
         end = offset + (slice_number + 1) * items_per_slice
         tmp = seq[start:end]
+
         if fill_with is not None and slice_number >= slices_with_extra:
             tmp.append(fill_with)
+
         yield tmp
 
 
-def do_batch(value, linecount, fill_with=None):
+@async_variant(sync_do_slice)  # type: ignore
+async def do_slice(
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    slices: int,
+    fill_with: t.Optional[t.Any] = None,
+) -> "t.Iterator[t.List[V]]":
+    return sync_do_slice(await auto_to_list(value), slices, fill_with)
+
+
+def do_batch(
+    value: "t.Iterable[V]", linecount: int, fill_with: "t.Optional[V]" = None
+) -> "t.Iterator[t.List[V]]":
     """
     A filter that batches items. It works pretty much like `slice`
     just the other way round. It returns a list of lists with the
@@ -612,20 +1088,27 @@
         {%- endfor %}
         </table>
     """
-    result = []
-    tmp = []
+    tmp: "t.List[V]" = []
+
     for item in value:
         if len(tmp) == linecount:
             yield tmp
             tmp = []
+
         tmp.append(item)
+
     if tmp:
         if fill_with is not None and len(tmp) < linecount:
             tmp += [fill_with] * (linecount - len(tmp))
+
         yield tmp
 
 
-def do_round(value, precision=0, method='common'):
+def do_round(
+    value: float,
+    precision: int = 0,
+    method: 'te.Literal["common", "ceil", "floor"]' = "common",
+) -> float:
     """Round the number to a given precision. The first
     parameter specifies the precision (default is ``0``), the
     second the rounding method:
@@ -651,69 +1134,147 @@
         {{ 42.55|round|int }}
             -> 43
     """
-    if not method in ('common', 'ceil', 'floor'):
-        raise FilterArgumentError('method must be common, ceil or floor')
-    if method == 'common':
+    if method not in {"common", "ceil", "floor"}:
+        raise FilterArgumentError("method must be common, ceil or floor")
+
+    if method == "common":
         return round(value, precision)
+
     func = getattr(math, method)
-    return func(value * (10 ** precision)) / (10 ** precision)
+    return t.cast(float, func(value * (10**precision)) / (10**precision))
 
 
-@environmentfilter
-def do_groupby(environment, value, attribute):
-    """Group a sequence of objects by a common attribute.
+class _GroupTuple(t.NamedTuple):
+    grouper: t.Any
+    list: t.List
 
-    If you for example have a list of dicts or objects that represent persons
-    with `gender`, `first_name` and `last_name` attributes and you want to
-    group all users by genders you can do something like the following
-    snippet:
+    # Use the regular tuple repr to hide this subclass if users print
+    # out the value during debugging.
+    def __repr__(self) -> str:
+        return tuple.__repr__(self)
+
+    def __str__(self) -> str:
+        return tuple.__str__(self)
+
+
+@pass_environment
+def sync_do_groupby(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    attribute: t.Union[str, int],
+    default: t.Optional[t.Any] = None,
+    case_sensitive: bool = False,
+) -> "t.List[_GroupTuple]":
+    """Group a sequence of objects by an attribute using Python's
+    :func:`itertools.groupby`. The attribute can use dot notation for
+    nested access, like ``"address.city"``. Unlike Python's ``groupby``,
+    the values are sorted first so only one group is returned for each
+    unique value.
+
+    For example, a list of ``User`` objects with a ``city`` attribute
+    can be rendered in groups. In this example, ``grouper`` refers to
+    the ``city`` value of the group.
 
     .. sourcecode:: html+jinja
 
-        <ul>
-        {% for group in persons|groupby('gender') %}
-            <li>{{ group.grouper }}<ul>
-            {% for person in group.list %}
-                <li>{{ person.first_name }} {{ person.last_name }}</li>
-            {% endfor %}</ul></li>
-        {% endfor %}
-        </ul>
+        <ul>{% for city, items in users|groupby("city") %}
+          <li>{{ city }}
+            <ul>{% for user in items %}
+              <li>{{ user.name }}
+            {% endfor %}</ul>
+          </li>
+        {% endfor %}</ul>
 
-    Additionally it's possible to use tuple unpacking for the grouper and
-    list:
+    ``groupby`` yields namedtuples of ``(grouper, list)``, which
+    can be used instead of the tuple unpacking above. ``grouper`` is the
+    value of the attribute, and ``list`` is the items with that value.
 
     .. sourcecode:: html+jinja
 
-        <ul>
-        {% for grouper, list in persons|groupby('gender') %}
-            ...
-        {% endfor %}
-        </ul>
+        <ul>{% for group in users|groupby("city") %}
+          <li>{{ group.grouper }}: {{ group.list|join(", ") }}
+        {% endfor %}</ul>
 
-    As you can see the item we're grouping by is stored in the `grouper`
-    attribute and the `list` contains all the objects that have this grouper
-    in common.
+    You can specify a ``default`` value to use if an object in the list
+    does not have the given attribute.
+
+    .. sourcecode:: jinja
+
+        <ul>{% for city, items in users|groupby("city", default="NY") %}
+          <li>{{ city }}: {{ items|map(attribute="name")|join(", ") }}</li>
+        {% endfor %}</ul>
+
+    Like the :func:`~jinja-filters.sort` filter, sorting and grouping is
+    case-insensitive by default. The ``key`` for each group will have
+    the case of the first item in that group of values. For example, if
+    a list of users has cities ``["CA", "NY", "ca"]``, the "CA" group
+    will have two values. This can be disabled by passing
+    ``case_sensitive=True``.
+
+    .. versionchanged:: 3.1
+        Added the ``case_sensitive`` parameter. Sorting and grouping is
+        case-insensitive by default, matching other filters that do
+        comparisons.
+
+    .. versionchanged:: 3.0
+        Added the ``default`` parameter.
 
     .. versionchanged:: 2.6
-       It's now possible to use dotted notation to group by the child
-       attribute of another attribute.
+        The attribute supports dot notation for nested access.
     """
-    expr = make_attrgetter(environment, attribute)
-    return sorted(map(_GroupTuple, groupby(sorted(value, key=expr), expr)))
+    expr = make_attrgetter(
+        environment,
+        attribute,
+        postprocess=ignore_case if not case_sensitive else None,
+        default=default,
+    )
+    out = [
+        _GroupTuple(key, list(values))
+        for key, values in groupby(sorted(value, key=expr), expr)
+    ]
+
+    if not case_sensitive:
+        # Return the real key from the first value instead of the lowercase key.
+        output_expr = make_attrgetter(environment, attribute, default=default)
+        out = [_GroupTuple(output_expr(values[0]), values) for _, values in out]
+
+    return out
 
 
-class _GroupTuple(tuple):
-    __slots__ = ()
-    grouper = property(itemgetter(0))
-    list = property(itemgetter(1))
+@async_variant(sync_do_groupby)  # type: ignore
+async def do_groupby(
+    environment: "Environment",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    attribute: t.Union[str, int],
+    default: t.Optional[t.Any] = None,
+    case_sensitive: bool = False,
+) -> "t.List[_GroupTuple]":
+    expr = make_attrgetter(
+        environment,
+        attribute,
+        postprocess=ignore_case if not case_sensitive else None,
+        default=default,
+    )
+    out = [
+        _GroupTuple(key, await auto_to_list(values))
+        for key, values in groupby(sorted(await auto_to_list(value), key=expr), expr)
+    ]
 
-    def __new__(cls, xxx_todo_changeme):
-        (key, value) = xxx_todo_changeme
-        return tuple.__new__(cls, (key, list(value)))
+    if not case_sensitive:
+        # Return the real key from the first value instead of the lowercase key.
+        output_expr = make_attrgetter(environment, attribute, default=default)
+        out = [_GroupTuple(output_expr(values[0]), values) for _, values in out]
+
+    return out
 
 
-@environmentfilter
-def do_sum(environment, iterable, attribute=None, start=0):
+@pass_environment
+def sync_do_sum(
+    environment: "Environment",
+    iterable: "t.Iterable[V]",
+    attribute: t.Optional[t.Union[str, int]] = None,
+    start: V = 0,  # type: ignore
+) -> V:
     """Returns the sum of a sequence of numbers plus the value of parameter
     'start' (which defaults to 0).  When the sequence is empty it returns
     start.
@@ -725,54 +1286,95 @@
         Total: {{ items|sum(attribute='price') }}
 
     .. versionchanged:: 2.6
-       The `attribute` parameter was added to allow suming up over
-       attributes.  Also the `start` parameter was moved on to the right.
+       The ``attribute`` parameter was added to allow summing up over
+       attributes.  Also the ``start`` parameter was moved on to the right.
     """
     if attribute is not None:
-        iterable = imap(make_attrgetter(environment, attribute), iterable)
-    return sum(iterable, start)
+        iterable = map(make_attrgetter(environment, attribute), iterable)
+
+    return sum(iterable, start)  # type: ignore[no-any-return, call-overload]
 
 
-def do_list(value):
+@async_variant(sync_do_sum)  # type: ignore
+async def do_sum(
+    environment: "Environment",
+    iterable: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    attribute: t.Optional[t.Union[str, int]] = None,
+    start: V = 0,  # type: ignore
+) -> V:
+    rv = start
+
+    if attribute is not None:
+        func = make_attrgetter(environment, attribute)
+    else:
+
+        def func(x: V) -> V:
+            return x
+
+    async for item in auto_aiter(iterable):
+        rv += func(item)
+
+    return rv
+
+
+def sync_do_list(value: "t.Iterable[V]") -> "t.List[V]":
     """Convert the value into a list.  If it was a string the returned list
     will be a list of characters.
     """
     return list(value)
 
 
-def do_mark_safe(value):
+@async_variant(sync_do_list)  # type: ignore
+async def do_list(value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]") -> "t.List[V]":
+    return await auto_to_list(value)
+
+
+def do_mark_safe(value: str) -> Markup:
     """Mark the value as safe which means that in an environment with automatic
     escaping enabled this variable will not be escaped.
     """
     return Markup(value)
 
 
-def do_mark_unsafe(value):
+def do_mark_unsafe(value: str) -> str:
     """Mark a value as unsafe.  This is the reverse operation for :func:`safe`."""
-    return text_type(value)
+    return str(value)
 
 
-def do_reverse(value):
-    """Reverse the object or return an iterator the iterates over it the other
+@typing.overload
+def do_reverse(value: str) -> str:
+    ...
+
+
+@typing.overload
+def do_reverse(value: "t.Iterable[V]") -> "t.Iterable[V]":
+    ...
+
+
+def do_reverse(value: t.Union[str, t.Iterable[V]]) -> t.Union[str, t.Iterable[V]]:
+    """Reverse the object or return an iterator that iterates over it the other
     way round.
     """
-    if isinstance(value, string_types):
+    if isinstance(value, str):
         return value[::-1]
+
     try:
-        return reversed(value)
+        return reversed(value)  # type: ignore
     except TypeError:
         try:
             rv = list(value)
             rv.reverse()
             return rv
-        except TypeError:
-            raise FilterArgumentError('argument must be iterable')
+        except TypeError as e:
+            raise FilterArgumentError("argument must be iterable") from e
 
 
-@environmentfilter
-def do_attr(environment, obj, name):
+@pass_environment
+def do_attr(
+    environment: "Environment", obj: t.Any, name: str
+) -> t.Union[Undefined, t.Any]:
     """Get an attribute of an object.  ``foo|attr("bar")`` works like
-    ``foo["bar"]`` just that always an attribute is returned and items are not
+    ``foo.bar`` just that always an attribute is returned and items are not
     looked up.
 
     See :ref:`Notes on subscriptions <notes-on-subscriptions>` for more details.
@@ -787,15 +1389,39 @@
         except AttributeError:
             pass
         else:
-            if environment.sandboxed and not \
-               environment.is_safe_attribute(obj, name, value):
-                return environment.unsafe_undefined(obj, name)
+            if environment.sandboxed:
+                environment = t.cast("SandboxedEnvironment", environment)
+
+                if not environment.is_safe_attribute(obj, name, value):
+                    return environment.unsafe_undefined(obj, name)
+
             return value
+
     return environment.undefined(obj=obj, name=name)
 
 
-@contextfilter
-def do_map(*args, **kwargs):
+@typing.overload
+def sync_do_map(
+    context: "Context", value: t.Iterable, name: str, *args: t.Any, **kwargs: t.Any
+) -> t.Iterable:
+    ...
+
+
+@typing.overload
+def sync_do_map(
+    context: "Context",
+    value: t.Iterable,
+    *,
+    attribute: str = ...,
+    default: t.Optional[t.Any] = None,
+) -> t.Iterable:
+    ...
+
+
+@pass_context
+def sync_do_map(
+    context: "Context", value: t.Iterable, *args: t.Any, **kwargs: t.Any
+) -> t.Iterable:
     """Applies a filter on a sequence of objects or looks up an attribute.
     This is useful when dealing with lists of objects but you are really
     only interested in a certain value of it.
@@ -807,6 +1433,13 @@
 
         Users on this page: {{ users|map(attribute='username')|join(', ') }}
 
+    You can specify a ``default`` value to use if an object in the list
+    does not have the given attribute.
+
+    .. sourcecode:: jinja
+
+        {{ users|map(attribute="username", default="Anonymous")|join(", ") }}
+
     Alternatively you can let it invoke a filter by passing the name of the
     filter and the arguments afterwards.  A good example would be applying a
     text conversion filter on a sequence:
@@ -815,51 +1448,111 @@
 
         Users on this page: {{ titles|map('lower')|join(', ') }}
 
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (u.username for u in users)
+        (getattr(u, "username", "Anonymous") for u in users)
+        (do_lower(x) for x in titles)
+
+    .. versionchanged:: 2.11.0
+        Added the ``default`` parameter.
+
     .. versionadded:: 2.7
     """
-    context = args[0]
-    seq = args[1]
+    if value:
+        func = prepare_map(context, args, kwargs)
 
-    if len(args) == 2 and 'attribute' in kwargs:
-        attribute = kwargs.pop('attribute')
-        if kwargs:
-            raise FilterArgumentError('Unexpected keyword argument %r' %
-                next(iter(kwargs)))
-        func = make_attrgetter(context.environment, attribute)
-    else:
-        try:
-            name = args[2]
-            args = args[3:]
-        except LookupError:
-            raise FilterArgumentError('map requires a filter argument')
-        func = lambda item: context.environment.call_filter(
-            name, item, args, kwargs, context=context)
-
-    if seq:
-        for item in seq:
+        for item in value:
             yield func(item)
 
 
-@contextfilter
-def do_select(*args, **kwargs):
-    """Filters a sequence of objects by appying a test to either the object
-    or the attribute and only selecting the ones with the test succeeding.
+@typing.overload
+def do_map(
+    context: "Context",
+    value: t.Union[t.AsyncIterable, t.Iterable],
+    name: str,
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> t.Iterable:
+    ...
+
+
+@typing.overload
+def do_map(
+    context: "Context",
+    value: t.Union[t.AsyncIterable, t.Iterable],
+    *,
+    attribute: str = ...,
+    default: t.Optional[t.Any] = None,
+) -> t.Iterable:
+    ...
+
+
+@async_variant(sync_do_map)  # type: ignore
+async def do_map(
+    context: "Context",
+    value: t.Union[t.AsyncIterable, t.Iterable],
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> t.AsyncIterable:
+    if value:
+        func = prepare_map(context, args, kwargs)
+
+        async for item in auto_aiter(value):
+            yield await auto_await(func(item))
+
+
+@pass_context
+def sync_do_select(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to each object,
+    and only selecting the objects with the test succeeding.
+
+    If no test is specified, each object will be evaluated as a boolean.
 
     Example usage:
 
     .. sourcecode:: jinja
 
         {{ numbers|select("odd") }}
+        {{ numbers|select("odd") }}
+        {{ numbers|select("divisibleby", 3) }}
+        {{ numbers|select("lessthan", 42) }}
+        {{ strings|select("equalto", "mystring") }}
+
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (n for n in numbers if test_odd(n))
+        (n for n in numbers if test_divisibleby(n, 3))
 
     .. versionadded:: 2.7
     """
-    return _select_or_reject(args, kwargs, lambda x: x, False)
+    return select_or_reject(context, value, args, kwargs, lambda x: x, False)
 
 
-@contextfilter
-def do_reject(*args, **kwargs):
-    """Filters a sequence of objects by appying a test to either the object
-    or the attribute and rejecting the ones with the test succeeding.
+@async_variant(sync_do_select)  # type: ignore
+async def do_select(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: x, False)
+
+
+@pass_context
+def sync_do_reject(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to each object,
+    and rejecting the objects with the test succeeding.
+
+    If no test is specified, each object will be evaluated as a boolean.
 
     Example usage:
 
@@ -867,15 +1560,37 @@
 
         {{ numbers|reject("odd") }}
 
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (n for n in numbers if not test_odd(n))
+
     .. versionadded:: 2.7
     """
-    return _select_or_reject(args, kwargs, lambda x: not x, False)
+    return select_or_reject(context, value, args, kwargs, lambda x: not x, False)
 
 
-@contextfilter
-def do_selectattr(*args, **kwargs):
-    """Filters a sequence of objects by appying a test to either the object
-    or the attribute and only selecting the ones with the test succeeding.
+@async_variant(sync_do_reject)  # type: ignore
+async def do_reject(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: not x, False)
+
+
+@pass_context
+def sync_do_selectattr(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to the specified
+    attribute of each object, and only selecting the objects with the
+    test succeeding.
+
+    If no test is specified, the attribute's value will be evaluated as
+    a boolean.
 
     Example usage:
 
@@ -884,104 +1599,242 @@
         {{ users|selectattr("is_active") }}
         {{ users|selectattr("email", "none") }}
 
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (u for user in users if user.is_active)
+        (u for user in users if test_none(user.email))
+
     .. versionadded:: 2.7
     """
-    return _select_or_reject(args, kwargs, lambda x: x, True)
+    return select_or_reject(context, value, args, kwargs, lambda x: x, True)
 
 
-@contextfilter
-def do_rejectattr(*args, **kwargs):
-    """Filters a sequence of objects by appying a test to either the object
-    or the attribute and rejecting the ones with the test succeeding.
+@async_variant(sync_do_selectattr)  # type: ignore
+async def do_selectattr(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: x, True)
+
+
+@pass_context
+def sync_do_rejectattr(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to the specified
+    attribute of each object, and rejecting the objects with the test
+    succeeding.
+
+    If no test is specified, the attribute's value will be evaluated as
+    a boolean.
 
     .. sourcecode:: jinja
 
         {{ users|rejectattr("is_active") }}
         {{ users|rejectattr("email", "none") }}
 
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (u for user in users if not user.is_active)
+        (u for user in users if not test_none(user.email))
+
     .. versionadded:: 2.7
     """
-    return _select_or_reject(args, kwargs, lambda x: not x, True)
+    return select_or_reject(context, value, args, kwargs, lambda x: not x, True)
 
 
-def _select_or_reject(args, kwargs, modfunc, lookup_attr):
-    context = args[0]
-    seq = args[1]
+@async_variant(sync_do_rejectattr)  # type: ignore
+async def do_rejectattr(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: not x, True)
+
+
+@pass_eval_context
+def do_tojson(
+    eval_ctx: "EvalContext", value: t.Any, indent: t.Optional[int] = None
+) -> Markup:
+    """Serialize an object to a string of JSON, and mark it safe to
+    render in HTML. This filter is only for use in HTML documents.
+
+    The returned string is safe to render in HTML documents and
+    ``<script>`` tags. The exception is in HTML attributes that are
+    double quoted; either use single quotes or the ``|forceescape``
+    filter.
+
+    :param value: The object to serialize to JSON.
+    :param indent: The ``indent`` parameter passed to ``dumps``, for
+        pretty-printing the value.
+
+    .. versionadded:: 2.9
+    """
+    policies = eval_ctx.environment.policies
+    dumps = policies["json.dumps_function"]
+    kwargs = policies["json.dumps_kwargs"]
+
+    if indent is not None:
+        kwargs = kwargs.copy()
+        kwargs["indent"] = indent
+
+    return htmlsafe_json_dumps(value, dumps=dumps, **kwargs)
+
+
+def prepare_map(
+    context: "Context", args: t.Tuple, kwargs: t.Dict[str, t.Any]
+) -> t.Callable[[t.Any], t.Any]:
+    if not args and "attribute" in kwargs:
+        attribute = kwargs.pop("attribute")
+        default = kwargs.pop("default", None)
+
+        if kwargs:
+            raise FilterArgumentError(
+                f"Unexpected keyword argument {next(iter(kwargs))!r}"
+            )
+
+        func = make_attrgetter(context.environment, attribute, default=default)
+    else:
+        try:
+            name = args[0]
+            args = args[1:]
+        except LookupError:
+            raise FilterArgumentError("map requires a filter argument") from None
+
+        def func(item: t.Any) -> t.Any:
+            return context.environment.call_filter(
+                name, item, args, kwargs, context=context
+            )
+
+    return func
+
+
+def prepare_select_or_reject(
+    context: "Context",
+    args: t.Tuple,
+    kwargs: t.Dict[str, t.Any],
+    modfunc: t.Callable[[t.Any], t.Any],
+    lookup_attr: bool,
+) -> t.Callable[[t.Any], t.Any]:
     if lookup_attr:
         try:
-            attr = args[2]
+            attr = args[0]
         except LookupError:
-            raise FilterArgumentError('Missing parameter for attribute name')
+            raise FilterArgumentError("Missing parameter for attribute name") from None
+
         transfunc = make_attrgetter(context.environment, attr)
         off = 1
     else:
         off = 0
-        transfunc = lambda x: x
+
+        def transfunc(x: V) -> V:
+            return x
 
     try:
-        name = args[2 + off]
-        args = args[3 + off:]
-        func = lambda item: context.environment.call_test(
-            name, item, args, kwargs)
-    except LookupError:
-        func = bool
+        name = args[off]
+        args = args[1 + off :]
 
-    if seq:
-        for item in seq:
-            if modfunc(func(transfunc(item))):
+        def func(item: t.Any) -> t.Any:
+            return context.environment.call_test(name, item, args, kwargs)
+
+    except LookupError:
+        func = bool  # type: ignore
+
+    return lambda item: modfunc(func(transfunc(item)))
+
+
+def select_or_reject(
+    context: "Context",
+    value: "t.Iterable[V]",
+    args: t.Tuple,
+    kwargs: t.Dict[str, t.Any],
+    modfunc: t.Callable[[t.Any], t.Any],
+    lookup_attr: bool,
+) -> "t.Iterator[V]":
+    if value:
+        func = prepare_select_or_reject(context, args, kwargs, modfunc, lookup_attr)
+
+        for item in value:
+            if func(item):
+                yield item
+
+
+async def async_select_or_reject(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    args: t.Tuple,
+    kwargs: t.Dict[str, t.Any],
+    modfunc: t.Callable[[t.Any], t.Any],
+    lookup_attr: bool,
+) -> "t.AsyncIterator[V]":
+    if value:
+        func = prepare_select_or_reject(context, args, kwargs, modfunc, lookup_attr)
+
+        async for item in auto_aiter(value):
+            if func(item):
                 yield item
 
 
 FILTERS = {
-    'attr':                 do_attr,
-    'replace':              do_replace,
-    'upper':                do_upper,
-    'lower':                do_lower,
-    'escape':               escape,
-    'e':                    escape,
-    'forceescape':          do_forceescape,
-    'capitalize':           do_capitalize,
-    'title':                do_title,
-    'default':              do_default,
-    'd':                    do_default,
-    'join':                 do_join,
-    'count':                len,
-    'dictsort':             do_dictsort,
-    'sort':                 do_sort,
-    'length':               len,
-    'reverse':              do_reverse,
-    'center':               do_center,
-    'indent':               do_indent,
-    'title':                do_title,
-    'capitalize':           do_capitalize,
-    'first':                do_first,
-    'last':                 do_last,
-    'map':                  do_map,
-    'random':               do_random,
-    'reject':               do_reject,
-    'rejectattr':           do_rejectattr,
-    'filesizeformat':       do_filesizeformat,
-    'pprint':               do_pprint,
-    'truncate':             do_truncate,
-    'wordwrap':             do_wordwrap,
-    'wordcount':            do_wordcount,
-    'int':                  do_int,
-    'float':                do_float,
-    'string':               soft_unicode,
-    'list':                 do_list,
-    'urlize':               do_urlize,
-    'format':               do_format,
-    'trim':                 do_trim,
-    'striptags':            do_striptags,
-    'select':               do_select,
-    'selectattr':           do_selectattr,
-    'slice':                do_slice,
-    'batch':                do_batch,
-    'sum':                  do_sum,
-    'abs':                  abs,
-    'round':                do_round,
-    'groupby':              do_groupby,
-    'safe':                 do_mark_safe,
-    'xmlattr':              do_xmlattr,
-    'urlencode':            do_urlencode
+    "abs": abs,
+    "attr": do_attr,
+    "batch": do_batch,
+    "capitalize": do_capitalize,
+    "center": do_center,
+    "count": len,
+    "d": do_default,
+    "default": do_default,
+    "dictsort": do_dictsort,
+    "e": escape,
+    "escape": escape,
+    "filesizeformat": do_filesizeformat,
+    "first": do_first,
+    "float": do_float,
+    "forceescape": do_forceescape,
+    "format": do_format,
+    "groupby": do_groupby,
+    "indent": do_indent,
+    "int": do_int,
+    "join": do_join,
+    "last": do_last,
+    "length": len,
+    "list": do_list,
+    "lower": do_lower,
+    "items": do_items,
+    "map": do_map,
+    "min": do_min,
+    "max": do_max,
+    "pprint": do_pprint,
+    "random": do_random,
+    "reject": do_reject,
+    "rejectattr": do_rejectattr,
+    "replace": do_replace,
+    "reverse": do_reverse,
+    "round": do_round,
+    "safe": do_mark_safe,
+    "select": do_select,
+    "selectattr": do_selectattr,
+    "slice": do_slice,
+    "sort": do_sort,
+    "string": soft_str,
+    "striptags": do_striptags,
+    "sum": do_sum,
+    "title": do_title,
+    "trim": do_trim,
+    "truncate": do_truncate,
+    "unique": do_unique,
+    "upper": do_upper,
+    "urlencode": do_urlencode,
+    "urlize": do_urlize,
+    "wordcount": do_wordcount,
+    "wordwrap": do_wordwrap,
+    "xmlattr": do_xmlattr,
+    "tojson": do_tojson,
 }

get_jinja2.sh

diff --git a/get_jinja2.sh b/get_jinja2.sh
deleted file mode 100755
index 9502146..0000000
--- a/get_jinja2.sh
+++ /dev/null
@@ -1,123 +0,0 @@
-#!/bin/bash
-# Download and extract Jinja2
-# Homepage:
-# http://jinja.pocoo.org/
-# Installation instructions:
-# http://jinja.pocoo.org/docs/intro/#from-the-tarball-release
-# Download page:
-# https://pypi.python.org/pypi/Jinja2
-PACKAGE='Jinja2'
-VERSION='2.7.1'
-PACKAGE_DIR='jinja2'
-
-CHROMIUM_FILES="README.chromium OWNERS get_jinja2.sh"
-EXTRA_FILES='LICENSE AUTHORS'
-REMOVE_FILES='testsuite'
-
-SRC_URL='https://pypi.python.org/packages/source/'
-SRC_URL+="${PACKAGE:0:1}/$PACKAGE/$PACKAGE-$VERSION.tar.gz"
-FILENAME="$(basename $SRC_URL)"
-MD5_FILENAME="$FILENAME.md5"
-SHA512_FILENAME="$FILENAME.sha512"
-CHROMIUM_FILES+=" $MD5_FILENAME $SHA512_FILENAME"
-
-BUILD_DIR="$PACKAGE-$VERSION"
-THIRD_PARTY="$(dirname $(realpath $(dirname "${BASH_SOURCE[0]}")))"
-INSTALL_DIR="$THIRD_PARTY/$PACKAGE_DIR"
-OUT_DIR="$INSTALL_DIR/$BUILD_DIR/$PACKAGE_DIR"
-OLD_DIR="$THIRD_PARTY/$PACKAGE_DIR.old"
-
-function check_hashes {
-  # Hashes generated via:
-  # FILENAME=Jinja2-2.7.1.tar.gz
-  # md5sum "$FILENAME" > "$FILENAME.md5"
-  # sha512sum "$FILENAME" > "$FILENAME.sha512"
-  # unset FILENAME
-
-  # MD5
-  if ! [ -f "$MD5_FILENAME" ]
-  then
-    echo "MD5 hash file $MD5_FILENAME not found, could not verify archive"
-    exit 1
-  fi
-
-  # 32-digit hash, followed by filename
-  MD5_HASHFILE_REGEX="^[0-9a-f]{32}  $FILENAME"
-  if ! grep --extended-regex --line-regex --silent \
-    "$MD5_HASHFILE_REGEX" "$MD5_FILENAME"
-  then
-    echo "MD5 hash file $MD5_FILENAME does not contain hash for $FILENAME," \
-         'could not verify archive'
-    echo 'Hash file contents are:'
-    cat "$MD5_FILENAME"
-    exit 1
-  fi
-
-  if ! md5sum --check "$MD5_FILENAME"
-  then
-    echo 'MD5 hash does not match,' \
-         "archive file $FILENAME corrupt or compromised!"
-    exit 1
-  fi
-
-  # SHA-512
-  if ! [ -f "$SHA512_FILENAME" ]
-  then
-    echo "SHA-512 hash file $SHA512_FILENAME not found," \
-         'could not verify archive'
-    exit 1
-  fi
-
-  # 128-digit hash, followed by filename
-  SHA512_HASHFILE_REGEX="^[0-9a-f]{128}  $FILENAME"
-  if ! grep --extended-regex --line-regex --silent \
-    "$SHA512_HASHFILE_REGEX" "$SHA512_FILENAME"
-  then
-    echo "SHA-512 hash file $SHA512_FILENAME does not contain hash for" \
-         "$FILENAME, could not verify archive"
-    echo 'Hash file contents are:'
-    cat "$SHA512_FILENAME"
-    exit 1
-  fi
-
-  if ! sha512sum --check "$SHA512_FILENAME"
-  then
-    echo 'SHA-512 hash does not match,' \
-         "archive file $FILENAME corrupt or compromised!"
-    exit 1
-  fi
-}
-
-
-################################################################################
-# Body
-
-cd "$INSTALL_DIR"
-echo "Downloading $SRC_URL"
-curl --remote-name "$SRC_URL"
-check_hashes
-tar xvzf "$FILENAME"
-# Copy extra files over
-for FILE in $CHROMIUM_FILES
-do
-  cp "$FILE" "$OUT_DIR"
-done
-
-cd "$BUILD_DIR"
-for FILE in $EXTRA_FILES
-do
-  cp "$FILE" "$OUT_DIR"
-done
-
-cd "$OUT_DIR"
-for FILE in $REMOVE_FILES
-do
-  rm -fr "$FILE"
-done
-
-# Replace with new directory
-cd ..
-mv "$INSTALL_DIR" "$OLD_DIR"
-mv "$PACKAGE_DIR" "$INSTALL_DIR"
-cd "$INSTALL_DIR"
-rm -fr "$OLD_DIR"

idtracking.py

diff --git a/idtracking.py b/idtracking.py
new file mode 100644
index 0000000..995ebaa
--- /dev/null
+++ b/idtracking.py
@@ -0,0 +1,318 @@
+import typing as t
+
+from . import nodes
+from .visitor import NodeVisitor
+
+VAR_LOAD_PARAMETER = "param"
+VAR_LOAD_RESOLVE = "resolve"
+VAR_LOAD_ALIAS = "alias"
+VAR_LOAD_UNDEFINED = "undefined"
+
+
+def find_symbols(
+    nodes: t.Iterable[nodes.Node], parent_symbols: t.Optional["Symbols"] = None
+) -> "Symbols":
+    sym = Symbols(parent=parent_symbols)
+    visitor = FrameSymbolVisitor(sym)
+    for node in nodes:
+        visitor.visit(node)
+    return sym
+
+
+def symbols_for_node(
+    node: nodes.Node, parent_symbols: t.Optional["Symbols"] = None
+) -> "Symbols":
+    sym = Symbols(parent=parent_symbols)
+    sym.analyze_node(node)
+    return sym
+
+
+class Symbols:
+    def __init__(
+        self, parent: t.Optional["Symbols"] = None, level: t.Optional[int] = None
+    ) -> None:
+        if level is None:
+            if parent is None:
+                level = 0
+            else:
+                level = parent.level + 1
+
+        self.level: int = level
+        self.parent = parent
+        self.refs: t.Dict[str, str] = {}
+        self.loads: t.Dict[str, t.Any] = {}
+        self.stores: t.Set[str] = set()
+
+    def analyze_node(self, node: nodes.Node, **kwargs: t.Any) -> None:
+        visitor = RootVisitor(self)
+        visitor.visit(node, **kwargs)
+
+    def _define_ref(
+        self, name: str, load: t.Optional[t.Tuple[str, t.Optional[str]]] = None
+    ) -> str:
+        ident = f"l_{self.level}_{name}"
+        self.refs[name] = ident
+        if load is not None:
+            self.loads[ident] = load
+        return ident
+
+    def find_load(self, target: str) -> t.Optional[t.Any]:
+        if target in self.loads:
+            return self.loads[target]
+
+        if self.parent is not None:
+            return self.parent.find_load(target)
+
+        return None
+
+    def find_ref(self, name: str) -> t.Optional[str]:
+        if name in self.refs:
+            return self.refs[name]
+
+        if self.parent is not None:
+            return self.parent.find_ref(name)
+
+        return None
+
+    def ref(self, name: str) -> str:
+        rv = self.find_ref(name)
+        if rv is None:
+            raise AssertionError(
+                "Tried to resolve a name to a reference that was"
+                f" unknown to the frame ({name!r})"
+            )
+        return rv
+
+    def copy(self) -> "Symbols":
+        rv = object.__new__(self.__class__)
+        rv.__dict__.update(self.__dict__)
+        rv.refs = self.refs.copy()
+        rv.loads = self.loads.copy()
+        rv.stores = self.stores.copy()
+        return rv
+
+    def store(self, name: str) -> None:
+        self.stores.add(name)
+
+        # If we have not see the name referenced yet, we need to figure
+        # out what to set it to.
+        if name not in self.refs:
+            # If there is a parent scope we check if the name has a
+            # reference there.  If it does it means we might have to alias
+            # to a variable there.
+            if self.parent is not None:
+                outer_ref = self.parent.find_ref(name)
+                if outer_ref is not None:
+                    self._define_ref(name, load=(VAR_LOAD_ALIAS, outer_ref))
+                    return
+
+            # Otherwise we can just set it to undefined.
+            self._define_ref(name, load=(VAR_LOAD_UNDEFINED, None))
+
+    def declare_parameter(self, name: str) -> str:
+        self.stores.add(name)
+        return self._define_ref(name, load=(VAR_LOAD_PARAMETER, None))
+
+    def load(self, name: str) -> None:
+        if self.find_ref(name) is None:
+            self._define_ref(name, load=(VAR_LOAD_RESOLVE, name))
+
+    def branch_update(self, branch_symbols: t.Sequence["Symbols"]) -> None:
+        stores: t.Dict[str, int] = {}
+        for branch in branch_symbols:
+            for target in branch.stores:
+                if target in self.stores:
+                    continue
+                stores[target] = stores.get(target, 0) + 1
+
+        for sym in branch_symbols:
+            self.refs.update(sym.refs)
+            self.loads.update(sym.loads)
+            self.stores.update(sym.stores)
+
+        for name, branch_count in stores.items():
+            if branch_count == len(branch_symbols):
+                continue
+
+            target = self.find_ref(name)  # type: ignore
+            assert target is not None, "should not happen"
+
+            if self.parent is not None:
+                outer_target = self.parent.find_ref(name)
+                if outer_target is not None:
+                    self.loads[target] = (VAR_LOAD_ALIAS, outer_target)
+                    continue
+            self.loads[target] = (VAR_LOAD_RESOLVE, name)
+
+    def dump_stores(self) -> t.Dict[str, str]:
+        rv: t.Dict[str, str] = {}
+        node: t.Optional["Symbols"] = self
+
+        while node is not None:
+            for name in sorted(node.stores):
+                if name not in rv:
+                    rv[name] = self.find_ref(name)  # type: ignore
+
+            node = node.parent
+
+        return rv
+
+    def dump_param_targets(self) -> t.Set[str]:
+        rv = set()
+        node: t.Optional["Symbols"] = self
+
+        while node is not None:
+            for target, (instr, _) in self.loads.items():
+                if instr == VAR_LOAD_PARAMETER:
+                    rv.add(target)
+
+            node = node.parent
+
+        return rv
+
+
+class RootVisitor(NodeVisitor):
+    def __init__(self, symbols: "Symbols") -> None:
+        self.sym_visitor = FrameSymbolVisitor(symbols)
+
+    def _simple_visit(self, node: nodes.Node, **kwargs: t.Any) -> None:
+        for child in node.iter_child_nodes():
+            self.sym_visitor.visit(child)
+
+    visit_Template = _simple_visit
+    visit_Block = _simple_visit
+    visit_Macro = _simple_visit
+    visit_FilterBlock = _simple_visit
+    visit_Scope = _simple_visit
+    visit_If = _simple_visit
+    visit_ScopedEvalContextModifier = _simple_visit
+
+    def visit_AssignBlock(self, node: nodes.AssignBlock, **kwargs: t.Any) -> None:
+        for child in node.body:
+            self.sym_visitor.visit(child)
+
+    def visit_CallBlock(self, node: nodes.CallBlock, **kwargs: t.Any) -> None:
+        for child in node.iter_child_nodes(exclude=("call",)):
+            self.sym_visitor.visit(child)
+
+    def visit_OverlayScope(self, node: nodes.OverlayScope, **kwargs: t.Any) -> None:
+        for child in node.body:
+            self.sym_visitor.visit(child)
+
+    def visit_For(
+        self, node: nodes.For, for_branch: str = "body", **kwargs: t.Any
+    ) -> None:
+        if for_branch == "body":
+            self.sym_visitor.visit(node.target, store_as_param=True)
+            branch = node.body
+        elif for_branch == "else":
+            branch = node.else_
+        elif for_branch == "test":
+            self.sym_visitor.visit(node.target, store_as_param=True)
+            if node.test is not None:
+                self.sym_visitor.visit(node.test)
+            return
+        else:
+            raise RuntimeError("Unknown for branch")
+
+        if branch:
+            for item in branch:
+                self.sym_visitor.visit(item)
+
+    def visit_With(self, node: nodes.With, **kwargs: t.Any) -> None:
+        for target in node.targets:
+            self.sym_visitor.visit(target)
+        for child in node.body:
+            self.sym_visitor.visit(child)
+
+    def generic_visit(self, node: nodes.Node, *args: t.Any, **kwargs: t.Any) -> None:
+        raise NotImplementedError(f"Cannot find symbols for {type(node).__name__!r}")
+
+
+class FrameSymbolVisitor(NodeVisitor):
+    """A visitor for `Frame.inspect`."""
+
+    def __init__(self, symbols: "Symbols") -> None:
+        self.symbols = symbols
+
+    def visit_Name(
+        self, node: nodes.Name, store_as_param: bool = False, **kwargs: t.Any
+    ) -> None:
+        """All assignments to names go through this function."""
+        if store_as_param or node.ctx == "param":
+            self.symbols.declare_parameter(node.name)
+        elif node.ctx == "store":
+            self.symbols.store(node.name)
+        elif node.ctx == "load":
+            self.symbols.load(node.name)
+
+    def visit_NSRef(self, node: nodes.NSRef, **kwargs: t.Any) -> None:
+        self.symbols.load(node.name)
+
+    def visit_If(self, node: nodes.If, **kwargs: t.Any) -> None:
+        self.visit(node.test, **kwargs)
+        original_symbols = self.symbols
+
+        def inner_visit(nodes: t.Iterable[nodes.Node]) -> "Symbols":
+            self.symbols = rv = original_symbols.copy()
+
+            for subnode in nodes:
+                self.visit(subnode, **kwargs)
+
+            self.symbols = original_symbols
+            return rv
+
+        body_symbols = inner_visit(node.body)
+        elif_symbols = inner_visit(node.elif_)
+        else_symbols = inner_visit(node.else_ or ())
+        self.symbols.branch_update([body_symbols, elif_symbols, else_symbols])
+
+    def visit_Macro(self, node: nodes.Macro, **kwargs: t.Any) -> None:
+        self.symbols.store(node.name)
+
+    def visit_Import(self, node: nodes.Import, **kwargs: t.Any) -> None:
+        self.generic_visit(node, **kwargs)
+        self.symbols.store(node.target)
+
+    def visit_FromImport(self, node: nodes.FromImport, **kwargs: t.Any) -> None:
+        self.generic_visit(node, **kwargs)
+
+        for name in node.names:
+            if isinstance(name, tuple):
+                self.symbols.store(name[1])
+            else:
+                self.symbols.store(name)
+
+    def visit_Assign(self, node: nodes.Assign, **kwargs: t.Any) -> None:
+        """Visit assignments in the correct order."""
+        self.visit(node.node, **kwargs)
+        self.visit(node.target, **kwargs)
+
+    def visit_For(self, node: nodes.For, **kwargs: t.Any) -> None:
+        """Visiting stops at for blocks.  However the block sequence
+        is visited as part of the outer scope.
+        """
+        self.visit(node.iter, **kwargs)
+
+    def visit_CallBlock(self, node: nodes.CallBlock, **kwargs: t.Any) -> None:
+        self.visit(node.call, **kwargs)
+
+    def visit_FilterBlock(self, node: nodes.FilterBlock, **kwargs: t.Any) -> None:
+        self.visit(node.filter, **kwargs)
+
+    def visit_With(self, node: nodes.With, **kwargs: t.Any) -> None:
+        for target in node.values:
+            self.visit(target)
+
+    def visit_AssignBlock(self, node: nodes.AssignBlock, **kwargs: t.Any) -> None:
+        """Stop visiting at block assigns."""
+        self.visit(node.target, **kwargs)
+
+    def visit_Scope(self, node: nodes.Scope, **kwargs: t.Any) -> None:
+        """Stop visiting at scopes."""
+
+    def visit_Block(self, node: nodes.Block, **kwargs: t.Any) -> None:
+        """Stop visiting at blocks."""
+
+    def visit_OverlayScope(self, node: nodes.OverlayScope, **kwargs: t.Any) -> None:
+        """Do not visit into overlay scopes."""

lexer.py

diff --git a/lexer.py b/lexer.py
index a501285..aff7e9f 100644
--- a/lexer.py
+++ b/lexer.py
@@ -1,243 +1,278 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.lexer
-    ~~~~~~~~~~~~
-
-    This module implements a Jinja / Python combination lexer. The
-    `Lexer` class provided by this module is used to do some preprocessing
-    for Jinja.
-
-    On the one hand it filters out invalid operators like the bitshift
-    operators we don't allow in templates. On the other hand it separates
-    template code and python code in expressions.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
+"""Implements a Jinja / Python combination lexer. The ``Lexer`` class
+is used to do some preprocessing. It filters out invalid operators like
+the bitshift operators we don't allow in templates. It separates
+template code and python code in expressions.
 """
 import re
-
-from operator import itemgetter
+import typing as t
+from ast import literal_eval
 from collections import deque
-from jinja2.exceptions import TemplateSyntaxError
-from jinja2.utils import LRUCache
-from jinja2._compat import next, iteritems, implements_iterator, text_type, \
-     intern
+from sys import intern
 
+from ._identifier import pattern as name_re
+from .exceptions import TemplateSyntaxError
+from .utils import LRUCache
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .environment import Environment
 
 # cache for the lexers. Exists in order to be able to have multiple
 # environments with the same lexer
-_lexer_cache = LRUCache(50)
+_lexer_cache: t.MutableMapping[t.Tuple, "Lexer"] = LRUCache(50)  # type: ignore
 
 # static regular expressions
-whitespace_re = re.compile(r'\s+', re.U)
-string_re = re.compile(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
-                       r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S)
-integer_re = re.compile(r'\d+')
-
-# we use the unicode identifier rule if this python version is able
-# to handle unicode identifiers, otherwise the standard ASCII one.
-try:
-    compile('föö', '<unknown>', 'eval')
-except SyntaxError:
-    name_re = re.compile(r'\b[a-zA-Z_][a-zA-Z0-9_]*\b')
-else:
-    from jinja2 import _stringdefs
-    name_re = re.compile(r'[%s][%s]*' % (_stringdefs.xid_start,
-                                         _stringdefs.xid_continue))
-
-float_re = re.compile(r'(?<!\.)\d+\.\d+')
-newline_re = re.compile(r'(\r\n|\r|\n)')
+whitespace_re = re.compile(r"\s+")
+newline_re = re.compile(r"(\r\n|\r|\n)")
+string_re = re.compile(
+    r"('([^'\\]*(?:\\.[^'\\]*)*)'" r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S
+)
+integer_re = re.compile(
+    r"""
+    (
+        0b(_?[0-1])+ # binary
+    |
+        0o(_?[0-7])+ # octal
+    |
+        0x(_?[\da-f])+ # hex
+    |
+        [1-9](_?\d)* # decimal
+    |
+        0(_?0)* # decimal zero
+    )
+    """,
+    re.IGNORECASE | re.VERBOSE,
+)
+float_re = re.compile(
+    r"""
+    (?<!\.)  # doesn't start with a .
+    (\d+_)*\d+  # digits, possibly _ separated
+    (
+        (\.(\d+_)*\d+)?  # optional fractional part
+        e[+\-]?(\d+_)*\d+  # exponent part
+    |
+        \.(\d+_)*\d+  # required fractional part
+    )
+    """,
+    re.IGNORECASE | re.VERBOSE,
+)
 
 # internal the tokens and keep references to them
-TOKEN_ADD = intern('add')
-TOKEN_ASSIGN = intern('assign')
-TOKEN_COLON = intern('colon')
-TOKEN_COMMA = intern('comma')
-TOKEN_DIV = intern('div')
-TOKEN_DOT = intern('dot')
-TOKEN_EQ = intern('eq')
-TOKEN_FLOORDIV = intern('floordiv')
-TOKEN_GT = intern('gt')
-TOKEN_GTEQ = intern('gteq')
-TOKEN_LBRACE = intern('lbrace')
-TOKEN_LBRACKET = intern('lbracket')
-TOKEN_LPAREN = intern('lparen')
-TOKEN_LT = intern('lt')
-TOKEN_LTEQ = intern('lteq')
-TOKEN_MOD = intern('mod')
-TOKEN_MUL = intern('mul')
-TOKEN_NE = intern('ne')
-TOKEN_PIPE = intern('pipe')
-TOKEN_POW = intern('pow')
-TOKEN_RBRACE = intern('rbrace')
-TOKEN_RBRACKET = intern('rbracket')
-TOKEN_RPAREN = intern('rparen')
-TOKEN_SEMICOLON = intern('semicolon')
-TOKEN_SUB = intern('sub')
-TOKEN_TILDE = intern('tilde')
-TOKEN_WHITESPACE = intern('whitespace')
-TOKEN_FLOAT = intern('float')
-TOKEN_INTEGER = intern('integer')
-TOKEN_NAME = intern('name')
-TOKEN_STRING = intern('string')
-TOKEN_OPERATOR = intern('operator')
-TOKEN_BLOCK_BEGIN = intern('block_begin')
-TOKEN_BLOCK_END = intern('block_end')
-TOKEN_VARIABLE_BEGIN = intern('variable_begin')
-TOKEN_VARIABLE_END = intern('variable_end')
-TOKEN_RAW_BEGIN = intern('raw_begin')
-TOKEN_RAW_END = intern('raw_end')
-TOKEN_COMMENT_BEGIN = intern('comment_begin')
-TOKEN_COMMENT_END = intern('comment_end')
-TOKEN_COMMENT = intern('comment')
-TOKEN_LINESTATEMENT_BEGIN = intern('linestatement_begin')
-TOKEN_LINESTATEMENT_END = intern('linestatement_end')
-TOKEN_LINECOMMENT_BEGIN = intern('linecomment_begin')
-TOKEN_LINECOMMENT_END = intern('linecomment_end')
-TOKEN_LINECOMMENT = intern('linecomment')
-TOKEN_DATA = intern('data')
-TOKEN_INITIAL = intern('initial')
-TOKEN_EOF = intern('eof')
+TOKEN_ADD = intern("add")
+TOKEN_ASSIGN = intern("assign")
+TOKEN_COLON = intern("colon")
+TOKEN_COMMA = intern("comma")
+TOKEN_DIV = intern("div")
+TOKEN_DOT = intern("dot")
+TOKEN_EQ = intern("eq")
+TOKEN_FLOORDIV = intern("floordiv")
+TOKEN_GT = intern("gt")
+TOKEN_GTEQ = intern("gteq")
+TOKEN_LBRACE = intern("lbrace")
+TOKEN_LBRACKET = intern("lbracket")
+TOKEN_LPAREN = intern("lparen")
+TOKEN_LT = intern("lt")
+TOKEN_LTEQ = intern("lteq")
+TOKEN_MOD = intern("mod")
+TOKEN_MUL = intern("mul")
+TOKEN_NE = intern("ne")
+TOKEN_PIPE = intern("pipe")
+TOKEN_POW = intern("pow")
+TOKEN_RBRACE = intern("rbrace")
+TOKEN_RBRACKET = intern("rbracket")
+TOKEN_RPAREN = intern("rparen")
+TOKEN_SEMICOLON = intern("semicolon")
+TOKEN_SUB = intern("sub")
+TOKEN_TILDE = intern("tilde")
+TOKEN_WHITESPACE = intern("whitespace")
+TOKEN_FLOAT = intern("float")
+TOKEN_INTEGER = intern("integer")
+TOKEN_NAME = intern("name")
+TOKEN_STRING = intern("string")
+TOKEN_OPERATOR = intern("operator")
+TOKEN_BLOCK_BEGIN = intern("block_begin")
+TOKEN_BLOCK_END = intern("block_end")
+TOKEN_VARIABLE_BEGIN = intern("variable_begin")
+TOKEN_VARIABLE_END = intern("variable_end")
+TOKEN_RAW_BEGIN = intern("raw_begin")
+TOKEN_RAW_END = intern("raw_end")
+TOKEN_COMMENT_BEGIN = intern("comment_begin")
+TOKEN_COMMENT_END = intern("comment_end")
+TOKEN_COMMENT = intern("comment")
+TOKEN_LINESTATEMENT_BEGIN = intern("linestatement_begin")
+TOKEN_LINESTATEMENT_END = intern("linestatement_end")
+TOKEN_LINECOMMENT_BEGIN = intern("linecomment_begin")
+TOKEN_LINECOMMENT_END = intern("linecomment_end")
+TOKEN_LINECOMMENT = intern("linecomment")
+TOKEN_DATA = intern("data")
+TOKEN_INITIAL = intern("initial")
+TOKEN_EOF = intern("eof")
 
 # bind operators to token types
 operators = {
-    '+':            TOKEN_ADD,
-    '-':            TOKEN_SUB,
-    '/':            TOKEN_DIV,
-    '//':           TOKEN_FLOORDIV,
-    '*':            TOKEN_MUL,
-    '%':            TOKEN_MOD,
-    '**':           TOKEN_POW,
-    '~':            TOKEN_TILDE,
-    '[':            TOKEN_LBRACKET,
-    ']':            TOKEN_RBRACKET,
-    '(':            TOKEN_LPAREN,
-    ')':            TOKEN_RPAREN,
-    '{':            TOKEN_LBRACE,
-    '}':            TOKEN_RBRACE,
-    '==':           TOKEN_EQ,
-    '!=':           TOKEN_NE,
-    '>':            TOKEN_GT,
-    '>=':           TOKEN_GTEQ,
-    '<':            TOKEN_LT,
-    '<=':           TOKEN_LTEQ,
-    '=':            TOKEN_ASSIGN,
-    '.':            TOKEN_DOT,
-    ':':            TOKEN_COLON,
-    '|':            TOKEN_PIPE,
-    ',':            TOKEN_COMMA,
-    ';':            TOKEN_SEMICOLON
+    "+": TOKEN_ADD,
+    "-": TOKEN_SUB,
+    "/": TOKEN_DIV,
+    "//": TOKEN_FLOORDIV,
+    "*": TOKEN_MUL,
+    "%": TOKEN_MOD,
+    "**": TOKEN_POW,
+    "~": TOKEN_TILDE,
+    "[": TOKEN_LBRACKET,
+    "]": TOKEN_RBRACKET,
+    "(": TOKEN_LPAREN,
+    ")": TOKEN_RPAREN,
+    "{": TOKEN_LBRACE,
+    "}": TOKEN_RBRACE,
+    "==": TOKEN_EQ,
+    "!=": TOKEN_NE,
+    ">": TOKEN_GT,
+    ">=": TOKEN_GTEQ,
+    "<": TOKEN_LT,
+    "<=": TOKEN_LTEQ,
+    "=": TOKEN_ASSIGN,
+    ".": TOKEN_DOT,
+    ":": TOKEN_COLON,
+    "|": TOKEN_PIPE,
+    ",": TOKEN_COMMA,
+    ";": TOKEN_SEMICOLON,
 }
 
-reverse_operators = dict([(v, k) for k, v in iteritems(operators)])
-assert len(operators) == len(reverse_operators), 'operators dropped'
-operator_re = re.compile('(%s)' % '|'.join(re.escape(x) for x in
-                         sorted(operators, key=lambda x: -len(x))))
+reverse_operators = {v: k for k, v in operators.items()}
+assert len(operators) == len(reverse_operators), "operators dropped"
+operator_re = re.compile(
+    f"({'|'.join(re.escape(x) for x in sorted(operators, key=lambda x: -len(x)))})"
+)
 
-ignored_tokens = frozenset([TOKEN_COMMENT_BEGIN, TOKEN_COMMENT,
-                            TOKEN_COMMENT_END, TOKEN_WHITESPACE,
-                            TOKEN_WHITESPACE, TOKEN_LINECOMMENT_BEGIN,
-                            TOKEN_LINECOMMENT_END, TOKEN_LINECOMMENT])
-ignore_if_empty = frozenset([TOKEN_WHITESPACE, TOKEN_DATA,
-                             TOKEN_COMMENT, TOKEN_LINECOMMENT])
+ignored_tokens = frozenset(
+    [
+        TOKEN_COMMENT_BEGIN,
+        TOKEN_COMMENT,
+        TOKEN_COMMENT_END,
+        TOKEN_WHITESPACE,
+        TOKEN_LINECOMMENT_BEGIN,
+        TOKEN_LINECOMMENT_END,
+        TOKEN_LINECOMMENT,
+    ]
+)
+ignore_if_empty = frozenset(
+    [TOKEN_WHITESPACE, TOKEN_DATA, TOKEN_COMMENT, TOKEN_LINECOMMENT]
+)
 
 
-def _describe_token_type(token_type):
+def _describe_token_type(token_type: str) -> str:
     if token_type in reverse_operators:
         return reverse_operators[token_type]
+
     return {
-        TOKEN_COMMENT_BEGIN:        'begin of comment',
-        TOKEN_COMMENT_END:          'end of comment',
-        TOKEN_COMMENT:              'comment',
-        TOKEN_LINECOMMENT:          'comment',
-        TOKEN_BLOCK_BEGIN:          'begin of statement block',
-        TOKEN_BLOCK_END:            'end of statement block',
-        TOKEN_VARIABLE_BEGIN:       'begin of print statement',
-        TOKEN_VARIABLE_END:         'end of print statement',
-        TOKEN_LINESTATEMENT_BEGIN:  'begin of line statement',
-        TOKEN_LINESTATEMENT_END:    'end of line statement',
-        TOKEN_DATA:                 'template data / text',
-        TOKEN_EOF:                  'end of template'
+        TOKEN_COMMENT_BEGIN: "begin of comment",
+        TOKEN_COMMENT_END: "end of comment",
+        TOKEN_COMMENT: "comment",
+        TOKEN_LINECOMMENT: "comment",
+        TOKEN_BLOCK_BEGIN: "begin of statement block",
+        TOKEN_BLOCK_END: "end of statement block",
+        TOKEN_VARIABLE_BEGIN: "begin of print statement",
+        TOKEN_VARIABLE_END: "end of print statement",
+        TOKEN_LINESTATEMENT_BEGIN: "begin of line statement",
+        TOKEN_LINESTATEMENT_END: "end of line statement",
+        TOKEN_DATA: "template data / text",
+        TOKEN_EOF: "end of template",
     }.get(token_type, token_type)
 
 
-def describe_token(token):
+def describe_token(token: "Token") -> str:
     """Returns a description of the token."""
-    if token.type == 'name':
+    if token.type == TOKEN_NAME:
         return token.value
+
     return _describe_token_type(token.type)
 
 
-def describe_token_expr(expr):
+def describe_token_expr(expr: str) -> str:
     """Like `describe_token` but for token expressions."""
-    if ':' in expr:
-        type, value = expr.split(':', 1)
-        if type == 'name':
+    if ":" in expr:
+        type, value = expr.split(":", 1)
+
+        if type == TOKEN_NAME:
             return value
     else:
         type = expr
+
     return _describe_token_type(type)
 
 
-def count_newlines(value):
+def count_newlines(value: str) -> int:
     """Count the number of newline characters in the string.  This is
     useful for extensions that filter a stream.
     """
     return len(newline_re.findall(value))
 
 
-def compile_rules(environment):
+def compile_rules(environment: "Environment") -> t.List[t.Tuple[str, str]]:
     """Compiles all the rules from the environment into a list of rules."""
     e = re.escape
     rules = [
-        (len(environment.comment_start_string), 'comment',
-         e(environment.comment_start_string)),
-        (len(environment.block_start_string), 'block',
-         e(environment.block_start_string)),
-        (len(environment.variable_start_string), 'variable',
-         e(environment.variable_start_string))
+        (
+            len(environment.comment_start_string),
+            TOKEN_COMMENT_BEGIN,
+            e(environment.comment_start_string),
+        ),
+        (
+            len(environment.block_start_string),
+            TOKEN_BLOCK_BEGIN,
+            e(environment.block_start_string),
+        ),
+        (
+            len(environment.variable_start_string),
+            TOKEN_VARIABLE_BEGIN,
+            e(environment.variable_start_string),
+        ),
     ]
 
     if environment.line_statement_prefix is not None:
-        rules.append((len(environment.line_statement_prefix), 'linestatement',
-                      r'^[ \t\v]*' + e(environment.line_statement_prefix)))
+        rules.append(
+            (
+                len(environment.line_statement_prefix),
+                TOKEN_LINESTATEMENT_BEGIN,
+                r"^[ \t\v]*" + e(environment.line_statement_prefix),
+            )
+        )
     if environment.line_comment_prefix is not None:
-        rules.append((len(environment.line_comment_prefix), 'linecomment',
-                      r'(?:^|(?<=\S))[^\S\r\n]*' +
-                      e(environment.line_comment_prefix)))
+        rules.append(
+            (
+                len(environment.line_comment_prefix),
+                TOKEN_LINECOMMENT_BEGIN,
+                r"(?:^|(?<=\S))[^\S\r\n]*" + e(environment.line_comment_prefix),
+            )
+        )
 
     return [x[1:] for x in sorted(rules, reverse=True)]
 
 
-class Failure(object):
+class Failure:
     """Class that raises a `TemplateSyntaxError` if called.
     Used by the `Lexer` to specify known errors.
     """
 
-    def __init__(self, message, cls=TemplateSyntaxError):
+    def __init__(
+        self, message: str, cls: t.Type[TemplateSyntaxError] = TemplateSyntaxError
+    ) -> None:
         self.message = message
         self.error_class = cls
 
-    def __call__(self, lineno, filename):
+    def __call__(self, lineno: int, filename: str) -> "te.NoReturn":
         raise self.error_class(self.message, lineno, filename)
 
 
-class Token(tuple):
-    """Token class."""
-    __slots__ = ()
-    lineno, type, value = (property(itemgetter(x)) for x in range(3))
+class Token(t.NamedTuple):
+    lineno: int
+    type: str
+    value: str
 
-    def __new__(cls, lineno, type, value):
-        return tuple.__new__(cls, (lineno, intern(str(type)), value))
+    def __str__(self) -> str:
+        return describe_token(self)
 
-    def __str__(self):
-        if self.type in reverse_operators:
-            return reverse_operators[self.type]
-        elif self.type == 'name':
-            return self.value
-        return self.type
-
-    def test(self, expr):
+    def test(self, expr: str) -> bool:
         """Test a token against a token expression.  This can either be a
         token type or ``'token_type:token_value'``.  This can only test
         against string values and types.
@@ -246,76 +281,75 @@
         # passed an iterable of not interned strings.
         if self.type == expr:
             return True
-        elif ':' in expr:
-            return expr.split(':', 1) == [self.type, self.value]
+
+        if ":" in expr:
+            return expr.split(":", 1) == [self.type, self.value]
+
         return False
 
-    def test_any(self, *iterable):
+    def test_any(self, *iterable: str) -> bool:
         """Test against multiple token expressions."""
-        for expr in iterable:
-            if self.test(expr):
-                return True
-        return False
-
-    def __repr__(self):
-        return 'Token(%r, %r, %r)' % (
-            self.lineno,
-            self.type,
-            self.value
-        )
+        return any(self.test(expr) for expr in iterable)
 
 
-@implements_iterator
-class TokenStreamIterator(object):
+class TokenStreamIterator:
     """The iterator for tokenstreams.  Iterate over the stream
     until the eof token is reached.
     """
 
-    def __init__(self, stream):
+    def __init__(self, stream: "TokenStream") -> None:
         self.stream = stream
 
-    def __iter__(self):
+    def __iter__(self) -> "TokenStreamIterator":
         return self
 
-    def __next__(self):
+    def __next__(self) -> Token:
         token = self.stream.current
+
         if token.type is TOKEN_EOF:
             self.stream.close()
-            raise StopIteration()
+            raise StopIteration
+
         next(self.stream)
         return token
 
 
-@implements_iterator
-class TokenStream(object):
-    """A token stream is an iterable that yields :class:`Token`\s.  The
+class TokenStream:
+    """A token stream is an iterable that yields :class:`Token`\\s.  The
     parser however does not iterate over it but calls :meth:`next` to go
     one token ahead.  The current active token is stored as :attr:`current`.
     """
 
-    def __init__(self, generator, name, filename):
+    def __init__(
+        self,
+        generator: t.Iterable[Token],
+        name: t.Optional[str],
+        filename: t.Optional[str],
+    ):
         self._iter = iter(generator)
-        self._pushed = deque()
+        self._pushed: "te.Deque[Token]" = deque()
         self.name = name
         self.filename = filename
         self.closed = False
-        self.current = Token(1, TOKEN_INITIAL, '')
+        self.current = Token(1, TOKEN_INITIAL, "")
         next(self)
 
-    def __iter__(self):
+    def __iter__(self) -> TokenStreamIterator:
         return TokenStreamIterator(self)
 
-    def __bool__(self):
+    def __bool__(self) -> bool:
         return bool(self._pushed) or self.current.type is not TOKEN_EOF
-    __nonzero__ = __bool__  # py2
 
-    eos = property(lambda x: not x, doc="Are we at the end of the stream?")
+    @property
+    def eos(self) -> bool:
+        """Are we at the end of the stream?"""
+        return not self
 
-    def push(self, token):
+    def push(self, token: Token) -> None:
         """Push a token back to the stream."""
         self._pushed.append(token)
 
-    def look(self):
+    def look(self) -> Token:
         """Look at the next token."""
         old_token = next(self)
         result = self.current
@@ -323,25 +357,31 @@
         self.current = old_token
         return result
 
-    def skip(self, n=1):
+    def skip(self, n: int = 1) -> None:
         """Got n tokens ahead."""
-        for x in range(n):
+        for _ in range(n):
             next(self)
 
-    def next_if(self, expr):
+    def next_if(self, expr: str) -> t.Optional[Token]:
         """Perform the token test and return the token if it matched.
         Otherwise the return value is `None`.
         """
         if self.current.test(expr):
             return next(self)
 
-    def skip_if(self, expr):
+        return None
+
+    def skip_if(self, expr: str) -> bool:
         """Like :meth:`next_if` but only returns `True` or `False`."""
         return self.next_if(expr) is not None
 
-    def __next__(self):
-        """Go one token ahead and return the old one"""
+    def __next__(self) -> Token:
+        """Go one token ahead and return the old one.
+
+        Use the built-in :func:`next` instead of calling this directly.
+        """
         rv = self.current
+
         if self._pushed:
             self.current = self._pushed.popleft()
         elif self.current.type is not TOKEN_EOF:
@@ -349,57 +389,84 @@
                 self.current = next(self._iter)
             except StopIteration:
                 self.close()
+
         return rv
 
-    def close(self):
+    def close(self) -> None:
         """Close the stream."""
-        self.current = Token(self.current.lineno, TOKEN_EOF, '')
-        self._iter = None
+        self.current = Token(self.current.lineno, TOKEN_EOF, "")
+        self._iter = iter(())
         self.closed = True
 
-    def expect(self, expr):
+    def expect(self, expr: str) -> Token:
         """Expect a given token type and return it.  This accepts the same
         argument as :meth:`jinja2.lexer.Token.test`.
         """
         if not self.current.test(expr):
             expr = describe_token_expr(expr)
+
             if self.current.type is TOKEN_EOF:
-                raise TemplateSyntaxError('unexpected end of template, '
-                                          'expected %r.' % expr,
-                                          self.current.lineno,
-                                          self.name, self.filename)
-            raise TemplateSyntaxError("expected token %r, got %r" %
-                                      (expr, describe_token(self.current)),
-                                      self.current.lineno,
-                                      self.name, self.filename)
-        try:
-            return self.current
-        finally:
-            next(self)
+                raise TemplateSyntaxError(
+                    f"unexpected end of template, expected {expr!r}.",
+                    self.current.lineno,
+                    self.name,
+                    self.filename,
+                )
+
+            raise TemplateSyntaxError(
+                f"expected token {expr!r}, got {describe_token(self.current)!r}",
+                self.current.lineno,
+                self.name,
+                self.filename,
+            )
+
+        return next(self)
 
 
-def get_lexer(environment):
+def get_lexer(environment: "Environment") -> "Lexer":
     """Return a lexer which is probably cached."""
-    key = (environment.block_start_string,
-           environment.block_end_string,
-           environment.variable_start_string,
-           environment.variable_end_string,
-           environment.comment_start_string,
-           environment.comment_end_string,
-           environment.line_statement_prefix,
-           environment.line_comment_prefix,
-           environment.trim_blocks,
-           environment.lstrip_blocks,
-           environment.newline_sequence,
-           environment.keep_trailing_newline)
+    key = (
+        environment.block_start_string,
+        environment.block_end_string,
+        environment.variable_start_string,
+        environment.variable_end_string,
+        environment.comment_start_string,
+        environment.comment_end_string,
+        environment.line_statement_prefix,
+        environment.line_comment_prefix,
+        environment.trim_blocks,
+        environment.lstrip_blocks,
+        environment.newline_sequence,
+        environment.keep_trailing_newline,
+    )
     lexer = _lexer_cache.get(key)
+
     if lexer is None:
-        lexer = Lexer(environment)
-        _lexer_cache[key] = lexer
+        _lexer_cache[key] = lexer = Lexer(environment)
+
     return lexer
 
 
-class Lexer(object):
+class OptionalLStrip(tuple):
+    """A special tuple for marking a point in the state that can have
+    lstrip applied.
+    """
+
+    __slots__ = ()
+
+    # Even though it looks like a no-op, creating instances fails
+    # without this.
+    def __new__(cls, *members, **kwargs):  # type: ignore
+        return super().__new__(cls, members)
+
+
+class _Rule(t.NamedTuple):
+    pattern: t.Pattern[str]
+    tokens: t.Union[str, t.Tuple[str, ...], t.Tuple[Failure]]
+    command: t.Optional[str]
+
+
+class Lexer:
     """Class that implements a lexer for a given environment. Automatically
     created by the environment class, usually you don't have to do that.
 
@@ -407,19 +474,21 @@
     Multiple environments can share the same lexer.
     """
 
-    def __init__(self, environment):
+    def __init__(self, environment: "Environment") -> None:
         # shortcuts
-        c = lambda x: re.compile(x, re.M | re.S)
         e = re.escape
 
+        def c(x: str) -> t.Pattern[str]:
+            return re.compile(x, re.M | re.S)
+
         # lexing rules for tags
-        tag_rules = [
-            (whitespace_re, TOKEN_WHITESPACE, None),
-            (float_re, TOKEN_FLOAT, None),
-            (integer_re, TOKEN_INTEGER, None),
-            (name_re, TOKEN_NAME, None),
-            (string_re, TOKEN_STRING, None),
-            (operator_re, TOKEN_OPERATOR, None)
+        tag_rules: t.List[_Rule] = [
+            _Rule(whitespace_re, TOKEN_WHITESPACE, None),
+            _Rule(float_re, TOKEN_FLOAT, None),
+            _Rule(integer_re, TOKEN_INTEGER, None),
+            _Rule(name_re, TOKEN_NAME, None),
+            _Rule(string_re, TOKEN_STRING, None),
+            _Rule(operator_re, TOKEN_OPERATOR, None),
         ]
 
         # assemble the root lexing rule. because "|" is ungreedy
@@ -430,195 +499,210 @@
         # is required.
         root_tag_rules = compile_rules(environment)
 
+        block_start_re = e(environment.block_start_string)
+        block_end_re = e(environment.block_end_string)
+        comment_end_re = e(environment.comment_end_string)
+        variable_end_re = e(environment.variable_end_string)
+
         # block suffix if trimming is enabled
-        block_suffix_re = environment.trim_blocks and '\\n?' or ''
+        block_suffix_re = "\\n?" if environment.trim_blocks else ""
 
-        # strip leading spaces if lstrip_blocks is enabled
-        prefix_re = {}
-        if environment.lstrip_blocks:
-            # use '{%+' to manually disable lstrip_blocks behavior
-            no_lstrip_re = e('+')
-            # detect overlap between block and variable or comment strings
-            block_diff = c(r'^%s(.*)' % e(environment.block_start_string))
-            # make sure we don't mistake a block for a variable or a comment
-            m = block_diff.match(environment.comment_start_string)
-            no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
-            m = block_diff.match(environment.variable_start_string)
-            no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
-
-            # detect overlap between comment and variable strings
-            comment_diff = c(r'^%s(.*)' % e(environment.comment_start_string))
-            m = comment_diff.match(environment.variable_start_string)
-            no_variable_re = m and r'(?!%s)' % e(m.group(1)) or ''
-
-            lstrip_re = r'^[ \t]*'
-            block_prefix_re = r'%s%s(?!%s)|%s\+?' % (
-                    lstrip_re,
-                    e(environment.block_start_string),
-                    no_lstrip_re,
-                    e(environment.block_start_string),
-                    )
-            comment_prefix_re = r'%s%s%s|%s\+?' % (
-                    lstrip_re,
-                    e(environment.comment_start_string),
-                    no_variable_re,
-                    e(environment.comment_start_string),
-                    )
-            prefix_re['block'] = block_prefix_re
-            prefix_re['comment'] = comment_prefix_re
-        else:
-            block_prefix_re = '%s' % e(environment.block_start_string)
+        self.lstrip_blocks = environment.lstrip_blocks
 
         self.newline_sequence = environment.newline_sequence
         self.keep_trailing_newline = environment.keep_trailing_newline
 
+        root_raw_re = (
+            rf"(?P<raw_begin>{block_start_re}(\-|\+|)\s*raw\s*"
+            rf"(?:\-{block_end_re}\s*|{block_end_re}))"
+        )
+        root_parts_re = "|".join(
+            [root_raw_re] + [rf"(?P<{n}>{r}(\-|\+|))" for n, r in root_tag_rules]
+        )
+
         # global lexing rules
-        self.rules = {
-            'root': [
+        self.rules: t.Dict[str, t.List[_Rule]] = {
+            "root": [
                 # directives
-                (c('(.*?)(?:%s)' % '|'.join(
-                    [r'(?P<raw_begin>(?:\s*%s\-|%s)\s*raw\s*(?:\-%s\s*|%s))' % (
-                        e(environment.block_start_string),
-                        block_prefix_re,
-                        e(environment.block_end_string),
-                        e(environment.block_end_string)
-                    )] + [
-                        r'(?P<%s_begin>\s*%s\-|%s)' % (n, r, prefix_re.get(n,r))
-                        for n, r in root_tag_rules
-                    ])), (TOKEN_DATA, '#bygroup'), '#bygroup'),
+                _Rule(
+                    c(rf"(.*?)(?:{root_parts_re})"),
+                    OptionalLStrip(TOKEN_DATA, "#bygroup"),  # type: ignore
+                    "#bygroup",
+                ),
                 # data
-                (c('.+'), TOKEN_DATA, None)
+                _Rule(c(".+"), TOKEN_DATA, None),
             ],
             # comments
             TOKEN_COMMENT_BEGIN: [
-                (c(r'(.*?)((?:\-%s\s*|%s)%s)' % (
-                    e(environment.comment_end_string),
-                    e(environment.comment_end_string),
-                    block_suffix_re
-                )), (TOKEN_COMMENT, TOKEN_COMMENT_END), '#pop'),
-                (c('(.)'), (Failure('Missing end of comment tag'),), None)
+                _Rule(
+                    c(
+                        rf"(.*?)((?:\+{comment_end_re}|\-{comment_end_re}\s*"
+                        rf"|{comment_end_re}{block_suffix_re}))"
+                    ),
+                    (TOKEN_COMMENT, TOKEN_COMMENT_END),
+                    "#pop",
+                ),
+                _Rule(c(r"(.)"), (Failure("Missing end of comment tag"),), None),
             ],
             # blocks
             TOKEN_BLOCK_BEGIN: [
-                (c('(?:\-%s\s*|%s)%s' % (
-                    e(environment.block_end_string),
-                    e(environment.block_end_string),
-                    block_suffix_re
-                )), TOKEN_BLOCK_END, '#pop'),
-            ] + tag_rules,
+                _Rule(
+                    c(
+                        rf"(?:\+{block_end_re}|\-{block_end_re}\s*"
+                        rf"|{block_end_re}{block_suffix_re})"
+                    ),
+                    TOKEN_BLOCK_END,
+                    "#pop",
+                ),
+            ]
+            + tag_rules,
             # variables
             TOKEN_VARIABLE_BEGIN: [
-                (c('\-%s\s*|%s' % (
-                    e(environment.variable_end_string),
-                    e(environment.variable_end_string)
-                )), TOKEN_VARIABLE_END, '#pop')
-            ] + tag_rules,
+                _Rule(
+                    c(rf"\-{variable_end_re}\s*|{variable_end_re}"),
+                    TOKEN_VARIABLE_END,
+                    "#pop",
+                )
+            ]
+            + tag_rules,
             # raw block
             TOKEN_RAW_BEGIN: [
-                (c('(.*?)((?:\s*%s\-|%s)\s*endraw\s*(?:\-%s\s*|%s%s))' % (
-                    e(environment.block_start_string),
-                    block_prefix_re,
-                    e(environment.block_end_string),
-                    e(environment.block_end_string),
-                    block_suffix_re
-                )), (TOKEN_DATA, TOKEN_RAW_END), '#pop'),
-                (c('(.)'), (Failure('Missing end of raw directive'),), None)
+                _Rule(
+                    c(
+                        rf"(.*?)((?:{block_start_re}(\-|\+|))\s*endraw\s*"
+                        rf"(?:\+{block_end_re}|\-{block_end_re}\s*"
+                        rf"|{block_end_re}{block_suffix_re}))"
+                    ),
+                    OptionalLStrip(TOKEN_DATA, TOKEN_RAW_END),  # type: ignore
+                    "#pop",
+                ),
+                _Rule(c(r"(.)"), (Failure("Missing end of raw directive"),), None),
             ],
             # line statements
             TOKEN_LINESTATEMENT_BEGIN: [
-                (c(r'\s*(\n|$)'), TOKEN_LINESTATEMENT_END, '#pop')
-            ] + tag_rules,
+                _Rule(c(r"\s*(\n|$)"), TOKEN_LINESTATEMENT_END, "#pop")
+            ]
+            + tag_rules,
             # line comments
             TOKEN_LINECOMMENT_BEGIN: [
-                (c(r'(.*?)()(?=\n|$)'), (TOKEN_LINECOMMENT,
-                 TOKEN_LINECOMMENT_END), '#pop')
-            ]
+                _Rule(
+                    c(r"(.*?)()(?=\n|$)"),
+                    (TOKEN_LINECOMMENT, TOKEN_LINECOMMENT_END),
+                    "#pop",
+                )
+            ],
         }
 
-    def _normalize_newlines(self, value):
-        """Called for strings and template data to normalize it to unicode."""
+    def _normalize_newlines(self, value: str) -> str:
+        """Replace all newlines with the configured sequence in strings
+        and template data.
+        """
         return newline_re.sub(self.newline_sequence, value)
 
-    def tokenize(self, source, name=None, filename=None, state=None):
-        """Calls tokeniter + tokenize and wraps it in a token stream.
-        """
+    def tokenize(
+        self,
+        source: str,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+        state: t.Optional[str] = None,
+    ) -> TokenStream:
+        """Calls tokeniter + tokenize and wraps it in a token stream."""
         stream = self.tokeniter(source, name, filename, state)
         return TokenStream(self.wrap(stream, name, filename), name, filename)
 
-    def wrap(self, stream, name=None, filename=None):
+    def wrap(
+        self,
+        stream: t.Iterable[t.Tuple[int, str, str]],
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+    ) -> t.Iterator[Token]:
         """This is called with the stream as returned by `tokenize` and wraps
         every token in a :class:`Token` and converts the value.
         """
-        for lineno, token, value in stream:
+        for lineno, token, value_str in stream:
             if token in ignored_tokens:
                 continue
-            elif token == 'linestatement_begin':
-                token = 'block_begin'
-            elif token == 'linestatement_end':
-                token = 'block_end'
+
+            value: t.Any = value_str
+
+            if token == TOKEN_LINESTATEMENT_BEGIN:
+                token = TOKEN_BLOCK_BEGIN
+            elif token == TOKEN_LINESTATEMENT_END:
+                token = TOKEN_BLOCK_END
             # we are not interested in those tokens in the parser
-            elif token in ('raw_begin', 'raw_end'):
+            elif token in (TOKEN_RAW_BEGIN, TOKEN_RAW_END):
                 continue
-            elif token == 'data':
-                value = self._normalize_newlines(value)
-            elif token == 'keyword':
-                token = value
-            elif token == 'name':
-                value = str(value)
-            elif token == 'string':
+            elif token == TOKEN_DATA:
+                value = self._normalize_newlines(value_str)
+            elif token == "keyword":
+                token = value_str
+            elif token == TOKEN_NAME:
+                value = value_str
+
+                if not value.isidentifier():
+                    raise TemplateSyntaxError(
+                        "Invalid character in identifier", lineno, name, filename
+                    )
+            elif token == TOKEN_STRING:
                 # try to unescape string
                 try:
-                    value = self._normalize_newlines(value[1:-1]) \
-                        .encode('ascii', 'backslashreplace') \
-                        .decode('unicode-escape')
+                    value = (
+                        self._normalize_newlines(value_str[1:-1])
+                        .encode("ascii", "backslashreplace")
+                        .decode("unicode-escape")
+                    )
                 except Exception as e:
-                    msg = str(e).split(':')[-1].strip()
-                    raise TemplateSyntaxError(msg, lineno, name, filename)
-                # if we can express it as bytestring (ascii only)
-                # we do that for support of semi broken APIs
-                # as datetime.datetime.strftime.  On python 3 this
-                # call becomes a noop thanks to 2to3
-                try:
-                    value = str(value)
-                except UnicodeError:
-                    pass
-            elif token == 'integer':
-                value = int(value)
-            elif token == 'float':
-                value = float(value)
-            elif token == 'operator':
-                token = operators[value]
+                    msg = str(e).split(":")[-1].strip()
+                    raise TemplateSyntaxError(msg, lineno, name, filename) from e
+            elif token == TOKEN_INTEGER:
+                value = int(value_str.replace("_", ""), 0)
+            elif token == TOKEN_FLOAT:
+                # remove all "_" first to support more Python versions
+                value = literal_eval(value_str.replace("_", ""))
+            elif token == TOKEN_OPERATOR:
+                token = operators[value_str]
+
             yield Token(lineno, token, value)
 
-    def tokeniter(self, source, name, filename=None, state=None):
+    def tokeniter(
+        self,
+        source: str,
+        name: t.Optional[str],
+        filename: t.Optional[str] = None,
+        state: t.Optional[str] = None,
+    ) -> t.Iterator[t.Tuple[int, str, str]]:
         """This method tokenizes the text and returns the tokens in a
-        generator.  Use this method if you just want to tokenize a template.
+        generator. Use this method if you just want to tokenize a template.
+
+        .. versionchanged:: 3.0
+            Only ``\\n``, ``\\r\\n`` and ``\\r`` are treated as line
+            breaks.
         """
-        source = text_type(source)
-        lines = source.splitlines()
-        if self.keep_trailing_newline and source:
-            for newline in ('\r\n', '\r', '\n'):
-                if source.endswith(newline):
-                    lines.append('')
-                    break
-        source = '\n'.join(lines)
+        lines = newline_re.split(source)[::2]
+
+        if not self.keep_trailing_newline and lines[-1] == "":
+            del lines[-1]
+
+        source = "\n".join(lines)
         pos = 0
         lineno = 1
-        stack = ['root']
-        if state is not None and state != 'root':
-            assert state in ('variable', 'block'), 'invalid state'
-            stack.append(state + '_begin')
-        else:
-            state = 'root'
+        stack = ["root"]
+
+        if state is not None and state != "root":
+            assert state in ("variable", "block"), "invalid state"
+            stack.append(state + "_begin")
+
         statetokens = self.rules[stack[-1]]
         source_length = len(source)
+        balancing_stack: t.List[str] = []
+        newlines_stripped = 0
+        line_starting = True
 
-        balancing_stack = []
-
-        while 1:
+        while True:
             # tokenizer loop
             for regex, tokens, new_state in statetokens:
                 m = regex.match(source, pos)
+
                 # if no match we try again with the next rule
                 if m is None:
                     continue
@@ -627,13 +711,48 @@
                 # are balanced. continue parsing with the lower rule which
                 # is the operator rule. do this only if the end tags look
                 # like operators
-                if balancing_stack and \
-                   tokens in ('variable_end', 'block_end',
-                              'linestatement_end'):
+                if balancing_stack and tokens in (
+                    TOKEN_VARIABLE_END,
+                    TOKEN_BLOCK_END,
+                    TOKEN_LINESTATEMENT_END,
+                ):
                     continue
 
                 # tuples support more options
                 if isinstance(tokens, tuple):
+                    groups: t.Sequence[str] = m.groups()
+
+                    if isinstance(tokens, OptionalLStrip):
+                        # Rule supports lstrip. Match will look like
+                        # text, block type, whitespace control, type, control, ...
+                        text = groups[0]
+                        # Skipping the text and first type, every other group is the
+                        # whitespace control for each type. One of the groups will be
+                        # -, +, or empty string instead of None.
+                        strip_sign = next(g for g in groups[2::2] if g is not None)
+
+                        if strip_sign == "-":
+                            # Strip all whitespace between the text and the tag.
+                            stripped = text.rstrip()
+                            newlines_stripped = text[len(stripped) :].count("\n")
+                            groups = [stripped, *groups[1:]]
+                        elif (
+                            # Not marked for preserving whitespace.
+                            strip_sign != "+"
+                            # lstrip is enabled.
+                            and self.lstrip_blocks
+                            # Not a variable expression.
+                            and not m.groupdict().get(TOKEN_VARIABLE_BEGIN)
+                        ):
+                            # The start of text between the last newline and the tag.
+                            l_pos = text.rfind("\n") + 1
+
+                            if l_pos > 0 or line_starting:
+                                # If there's only whitespace between the newline and the
+                                # tag, strip it.
+                                if whitespace_re.fullmatch(text, l_pos):
+                                    groups = [text[:l_pos], *groups[1:]]
+
                     for idx, token in enumerate(tokens):
                         # failure group
                         if token.__class__ is Failure:
@@ -641,52 +760,62 @@
                         # bygroup is a bit more complex, in that case we
                         # yield for the current token the first named
                         # group that matched
-                        elif token == '#bygroup':
-                            for key, value in iteritems(m.groupdict()):
+                        elif token == "#bygroup":
+                            for key, value in m.groupdict().items():
                                 if value is not None:
                                     yield lineno, key, value
-                                    lineno += value.count('\n')
+                                    lineno += value.count("\n")
                                     break
                             else:
-                                raise RuntimeError('%r wanted to resolve '
-                                                   'the token dynamically'
-                                                   ' but no group matched'
-                                                   % regex)
+                                raise RuntimeError(
+                                    f"{regex!r} wanted to resolve the token dynamically"
+                                    " but no group matched"
+                                )
                         # normal group
                         else:
-                            data = m.group(idx + 1)
+                            data = groups[idx]
+
                             if data or token not in ignore_if_empty:
                                 yield lineno, token, data
-                            lineno += data.count('\n')
+
+                            lineno += data.count("\n") + newlines_stripped
+                            newlines_stripped = 0
 
                 # strings as token just are yielded as it.
                 else:
                     data = m.group()
+
                     # update brace/parentheses balance
-                    if tokens == 'operator':
-                        if data == '{':
-                            balancing_stack.append('}')
-                        elif data == '(':
-                            balancing_stack.append(')')
-                        elif data == '[':
-                            balancing_stack.append(']')
-                        elif data in ('}', ')', ']'):
+                    if tokens == TOKEN_OPERATOR:
+                        if data == "{":
+                            balancing_stack.append("}")
+                        elif data == "(":
+                            balancing_stack.append(")")
+                        elif data == "[":
+                            balancing_stack.append("]")
+                        elif data in ("}", ")", "]"):
                             if not balancing_stack:
-                                raise TemplateSyntaxError('unexpected \'%s\'' %
-                                                          data, lineno, name,
-                                                          filename)
+                                raise TemplateSyntaxError(
+                                    f"unexpected '{data}'", lineno, name, filename
+                                )
+
                             expected_op = balancing_stack.pop()
+
                             if expected_op != data:
-                                raise TemplateSyntaxError('unexpected \'%s\', '
-                                                          'expected \'%s\'' %
-                                                          (data, expected_op),
-                                                          lineno, name,
-                                                          filename)
+                                raise TemplateSyntaxError(
+                                    f"unexpected '{data}', expected '{expected_op}'",
+                                    lineno,
+                                    name,
+                                    filename,
+                                )
+
                     # yield items
                     if data or tokens not in ignore_if_empty:
                         yield lineno, tokens, data
-                    lineno += data.count('\n')
 
+                    lineno += data.count("\n")
+
+                line_starting = m.group()[-1:] == "\n"
                 # fetch new position into new variable so that we can check
                 # if there is a internal parsing error which would result
                 # in an infinite loop
@@ -695,29 +824,32 @@
                 # handle state changes
                 if new_state is not None:
                     # remove the uppermost state
-                    if new_state == '#pop':
+                    if new_state == "#pop":
                         stack.pop()
                     # resolve the new state by group checking
-                    elif new_state == '#bygroup':
-                        for key, value in iteritems(m.groupdict()):
+                    elif new_state == "#bygroup":
+                        for key, value in m.groupdict().items():
                             if value is not None:
                                 stack.append(key)
                                 break
                         else:
-                            raise RuntimeError('%r wanted to resolve the '
-                                               'new state dynamically but'
-                                               ' no group matched' %
-                                               regex)
+                            raise RuntimeError(
+                                f"{regex!r} wanted to resolve the new state dynamically"
+                                f" but no group matched"
+                            )
                     # direct state name given
                     else:
                         stack.append(new_state)
+
                     statetokens = self.rules[stack[-1]]
                 # we are still at the same position and no stack change.
                 # this means a loop without break condition, avoid that and
                 # raise error
                 elif pos2 == pos:
-                    raise RuntimeError('%r yielded empty string without '
-                                       'stack change' % regex)
+                    raise RuntimeError(
+                        f"{regex!r} yielded empty string without stack change"
+                    )
+
                 # publish new function and start again
                 pos = pos2
                 break
@@ -727,7 +859,8 @@
                 # end of text
                 if pos >= source_length:
                     return
+
                 # something went wrong
-                raise TemplateSyntaxError('unexpected char %r at %d' %
-                                          (source[pos], pos), lineno,
-                                          name, filename)
+                raise TemplateSyntaxError(
+                    f"unexpected char {source[pos]!r} at {pos}", lineno, name, filename
+                )

loaders.py

diff --git a/loaders.py b/loaders.py
index a9a2625..d2f9809 100644
--- a/loaders.py
+++ b/loaders.py
@@ -1,40 +1,45 @@
-# -*- coding: utf-8 -*-
+"""API and implementations for loading templates from different data
+sources.
 """
-    jinja2.loaders
-    ~~~~~~~~~~~~~~
-
-    Jinja loader classes.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
+import importlib.util
 import os
+import posixpath
 import sys
+import typing as t
 import weakref
-from types import ModuleType
-from os import path
+import zipimport
+from collections import abc
 from hashlib import sha1
-from jinja2.exceptions import TemplateNotFound
-from jinja2.utils import open_if_exists, internalcode
-from jinja2._compat import string_types, iteritems
+from importlib import import_module
+from types import ModuleType
+
+from .exceptions import TemplateNotFound
+from .utils import internalcode
+from .utils import open_if_exists
+
+if t.TYPE_CHECKING:
+    from .environment import Environment
+    from .environment import Template
 
 
-def split_template_path(template):
+def split_template_path(template: str) -> t.List[str]:
     """Split a path into segments and perform a sanity check.  If it detects
     '..' in the path it will raise a `TemplateNotFound` error.
     """
     pieces = []
-    for piece in template.split('/'):
-        if path.sep in piece \
-           or (path.altsep and path.altsep in piece) or \
-           piece == path.pardir:
+    for piece in template.split("/"):
+        if (
+            os.path.sep in piece
+            or (os.path.altsep and os.path.altsep in piece)
+            or piece == os.path.pardir
+        ):
             raise TemplateNotFound(template)
-        elif piece and piece != '.':
+        elif piece and piece != ".":
             pieces.append(piece)
     return pieces
 
 
-class BaseLoader(object):
+class BaseLoader:
     """Baseclass for all loaders.  Subclass this and override `get_source` to
     implement a custom loading mechanism.  The environment provides a
     `get_template` method that calls the loader's `load` method to get the
@@ -56,8 +61,8 @@
                 if not exists(path):
                     raise TemplateNotFound(template)
                 mtime = getmtime(path)
-                with file(path) as f:
-                    source = f.read().decode('utf-8')
+                with open(path) as f:
+                    source = f.read()
                 return source, path, lambda: mtime == getmtime(path)
     """
 
@@ -67,16 +72,18 @@
     #: .. versionadded:: 2.4
     has_source_access = True
 
-    def get_source(self, environment, template):
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
         """Get the template source, filename and reload helper for a template.
         It's passed the environment and template name and has to return a
         tuple in the form ``(source, filename, uptodate)`` or raise a
         `TemplateNotFound` error if it can't locate the template.
 
         The source part of the returned tuple must be the source of the
-        template as unicode string or a ASCII bytestring.  The filename should
-        be the name of the file on the filesystem if it was loaded from there,
-        otherwise `None`.  The filename is used by python for the tracebacks
+        template as a string. The filename should be the name of the
+        file on the filesystem if it was loaded from there, otherwise
+        ``None``. The filename is used by Python for the tracebacks
         if no loader extension is used.
 
         The last item in the tuple is the `uptodate` function.  If auto
@@ -86,18 +93,24 @@
         the template will be reloaded.
         """
         if not self.has_source_access:
-            raise RuntimeError('%s cannot provide access to the source' %
-                               self.__class__.__name__)
+            raise RuntimeError(
+                f"{type(self).__name__} cannot provide access to the source"
+            )
         raise TemplateNotFound(template)
 
-    def list_templates(self):
+    def list_templates(self) -> t.List[str]:
         """Iterates over all templates.  If the loader does not support that
         it should raise a :exc:`TypeError` which is the default behavior.
         """
-        raise TypeError('this loader cannot iterate over all templates')
+        raise TypeError("this loader cannot iterate over all templates")
 
     @internalcode
-    def load(self, environment, name, globals=None):
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
         """Loads a template.  This method looks up the template in the cache
         or loads one by calling :meth:`get_source`.  Subclasses should not
         override this method as loaders working on collections of other
@@ -131,35 +144,59 @@
             bucket.code = code
             bcc.set_bucket(bucket)
 
-        return environment.template_class.from_code(environment, code,
-                                                    globals, uptodate)
+        return environment.template_class.from_code(
+            environment, code, globals, uptodate
+        )
 
 
 class FileSystemLoader(BaseLoader):
-    """Loads templates from the file system.  This loader can find templates
-    in folders on the file system and is the preferred way to load them.
+    """Load templates from a directory in the file system.
 
-    The loader takes the path to the templates as string, or if multiple
-    locations are wanted a list of them which is then looked up in the
-    given order:
+    The path can be relative or absolute. Relative paths are relative to
+    the current working directory.
 
-    >>> loader = FileSystemLoader('/path/to/templates')
-    >>> loader = FileSystemLoader(['/path/to/templates', '/other/path'])
+    .. code-block:: python
 
-    Per default the template encoding is ``'utf-8'`` which can be changed
-    by setting the `encoding` parameter to something else.
+        loader = FileSystemLoader("templates")
+
+    A list of paths can be given. The directories will be searched in
+    order, stopping at the first matching template.
+
+    .. code-block:: python
+
+        loader = FileSystemLoader(["/override/templates", "/default/templates"])
+
+    :param searchpath: A path, or list of paths, to the directory that
+        contains the templates.
+    :param encoding: Use this encoding to read the text from template
+        files.
+    :param followlinks: Follow symbolic links in the path.
+
+    .. versionchanged:: 2.8
+        Added the ``followlinks`` parameter.
     """
 
-    def __init__(self, searchpath, encoding='utf-8'):
-        if isinstance(searchpath, string_types):
+    def __init__(
+        self,
+        searchpath: t.Union[str, os.PathLike, t.Sequence[t.Union[str, os.PathLike]]],
+        encoding: str = "utf-8",
+        followlinks: bool = False,
+    ) -> None:
+        if not isinstance(searchpath, abc.Iterable) or isinstance(searchpath, str):
             searchpath = [searchpath]
-        self.searchpath = list(searchpath)
-        self.encoding = encoding
 
-    def get_source(self, environment, template):
+        self.searchpath = [os.fspath(p) for p in searchpath]
+        self.encoding = encoding
+        self.followlinks = followlinks
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, str, t.Callable[[], bool]]:
         pieces = split_template_path(template)
         for searchpath in self.searchpath:
-            filename = path.join(searchpath, *pieces)
+            # Use posixpath even on Windows to avoid "drive:" or UNC
+            # segments breaking out of the search directory.
+            filename = posixpath.join(searchpath, *pieces)
             f = open_if_exists(filename)
             if f is None:
                 continue
@@ -168,24 +205,30 @@
             finally:
                 f.close()
 
-            mtime = path.getmtime(filename)
-            def uptodate():
+            mtime = os.path.getmtime(filename)
+
+            def uptodate() -> bool:
                 try:
-                    return path.getmtime(filename) == mtime
+                    return os.path.getmtime(filename) == mtime
                 except OSError:
                     return False
-            return contents, filename, uptodate
+
+            # Use normpath to convert Windows altsep to sep.
+            return contents, os.path.normpath(filename), uptodate
         raise TemplateNotFound(template)
 
-    def list_templates(self):
+    def list_templates(self) -> t.List[str]:
         found = set()
         for searchpath in self.searchpath:
-            for dirpath, dirnames, filenames in os.walk(searchpath):
+            walk_dir = os.walk(searchpath, followlinks=self.followlinks)
+            for dirpath, _, filenames in walk_dir:
                 for filename in filenames:
-                    template = os.path.join(dirpath, filename) \
-                        [len(searchpath):].strip(os.path.sep) \
-                                          .replace(os.path.sep, '/')
-                    if template[:2] == './':
+                    template = (
+                        os.path.join(dirpath, filename)[len(searchpath) :]
+                        .strip(os.path.sep)
+                        .replace(os.path.sep, "/")
+                    )
+                    if template[:2] == "./":
                         template = template[2:]
                     if template not in found:
                         found.add(template)
@@ -193,96 +236,199 @@
 
 
 class PackageLoader(BaseLoader):
-    """Load templates from python eggs or packages.  It is constructed with
-    the name of the python package and the path to the templates in that
-    package::
+    """Load templates from a directory in a Python package.
 
-        loader = PackageLoader('mypackage', 'views')
+    :param package_name: Import name of the package that contains the
+        template directory.
+    :param package_path: Directory within the imported package that
+        contains the templates.
+    :param encoding: Encoding of template files.
 
-    If the package path is not given, ``'templates'`` is assumed.
+    The following example looks up templates in the ``pages`` directory
+    within the ``project.ui`` package.
 
-    Per default the template encoding is ``'utf-8'`` which can be changed
-    by setting the `encoding` parameter to something else.  Due to the nature
-    of eggs it's only possible to reload templates if the package was loaded
-    from the file system and not a zip file.
+    .. code-block:: python
+
+        loader = PackageLoader("project.ui", "pages")
+
+    Only packages installed as directories (standard pip behavior) or
+    zip/egg files (less common) are supported. The Python API for
+    introspecting data in packages is too limited to support other
+    installation methods the way this loader requires.
+
+    There is limited support for :pep:`420` namespace packages. The
+    template directory is assumed to only be in one namespace
+    contributor. Zip files contributing to a namespace are not
+    supported.
+
+    .. versionchanged:: 3.0
+        No longer uses ``setuptools`` as a dependency.
+
+    .. versionchanged:: 3.0
+        Limited PEP 420 namespace package support.
     """
 
-    def __init__(self, package_name, package_path='templates',
-                 encoding='utf-8'):
-        from pkg_resources import DefaultProvider, ResourceManager, \
-                                  get_provider
-        provider = get_provider(package_name)
-        self.encoding = encoding
-        self.manager = ResourceManager()
-        self.filesystem_bound = isinstance(provider, DefaultProvider)
-        self.provider = provider
+    def __init__(
+        self,
+        package_name: str,
+        package_path: "str" = "templates",
+        encoding: str = "utf-8",
+    ) -> None:
+        package_path = os.path.normpath(package_path).rstrip(os.path.sep)
+
+        # normpath preserves ".", which isn't valid in zip paths.
+        if package_path == os.path.curdir:
+            package_path = ""
+        elif package_path[:2] == os.path.curdir + os.path.sep:
+            package_path = package_path[2:]
+
         self.package_path = package_path
+        self.package_name = package_name
+        self.encoding = encoding
 
-    def get_source(self, environment, template):
-        pieces = split_template_path(template)
-        p = '/'.join((self.package_path,) + tuple(pieces))
-        if not self.provider.has_resource(p):
-            raise TemplateNotFound(template)
+        # Make sure the package exists. This also makes namespace
+        # packages work, otherwise get_loader returns None.
+        import_module(package_name)
+        spec = importlib.util.find_spec(package_name)
+        assert spec is not None, "An import spec was not found for the package."
+        loader = spec.loader
+        assert loader is not None, "A loader was not found for the package."
+        self._loader = loader
+        self._archive = None
+        template_root = None
 
-        filename = uptodate = None
-        if self.filesystem_bound:
-            filename = self.provider.get_resource_filename(self.manager, p)
-            mtime = path.getmtime(filename)
-            def uptodate():
-                try:
-                    return path.getmtime(filename) == mtime
-                except OSError:
-                    return False
+        if isinstance(loader, zipimport.zipimporter):
+            self._archive = loader.archive
+            pkgdir = next(iter(spec.submodule_search_locations))  # type: ignore
+            template_root = os.path.join(pkgdir, package_path).rstrip(os.path.sep)
+        else:
+            roots: t.List[str] = []
 
-        source = self.provider.get_resource_string(self.manager, p)
-        return source.decode(self.encoding), filename, uptodate
+            # One element for regular packages, multiple for namespace
+            # packages, or None for single module file.
+            if spec.submodule_search_locations:
+                roots.extend(spec.submodule_search_locations)
+            # A single module file, use the parent directory instead.
+            elif spec.origin is not None:
+                roots.append(os.path.dirname(spec.origin))
 
-    def list_templates(self):
-        path = self.package_path
-        if path[:2] == './':
-            path = path[2:]
-        elif path == '.':
-            path = ''
-        offset = len(path)
-        results = []
-        def _walk(path):
-            for filename in self.provider.resource_listdir(path):
-                fullname = path + '/' + filename
-                if self.provider.resource_isdir(fullname):
-                    _walk(fullname)
-                else:
-                    results.append(fullname[offset:].lstrip('/'))
-        _walk(path)
+            for root in roots:
+                root = os.path.join(root, package_path)
+
+                if os.path.isdir(root):
+                    template_root = root
+                    break
+
+        if template_root is None:
+            raise ValueError(
+                f"The {package_name!r} package was not installed in a"
+                " way that PackageLoader understands."
+            )
+
+        self._template_root = template_root
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, str, t.Optional[t.Callable[[], bool]]]:
+        # Use posixpath even on Windows to avoid "drive:" or UNC
+        # segments breaking out of the search directory. Use normpath to
+        # convert Windows altsep to sep.
+        p = os.path.normpath(
+            posixpath.join(self._template_root, *split_template_path(template))
+        )
+        up_to_date: t.Optional[t.Callable[[], bool]]
+
+        if self._archive is None:
+            # Package is a directory.
+            if not os.path.isfile(p):
+                raise TemplateNotFound(template)
+
+            with open(p, "rb") as f:
+                source = f.read()
+
+            mtime = os.path.getmtime(p)
+
+            def up_to_date() -> bool:
+                return os.path.isfile(p) and os.path.getmtime(p) == mtime
+
+        else:
+            # Package is a zip file.
+            try:
+                source = self._loader.get_data(p)  # type: ignore
+            except OSError as e:
+                raise TemplateNotFound(template) from e
+
+            # Could use the zip's mtime for all template mtimes, but
+            # would need to safely reload the module if it's out of
+            # date, so just report it as always current.
+            up_to_date = None
+
+        return source.decode(self.encoding), p, up_to_date
+
+    def list_templates(self) -> t.List[str]:
+        results: t.List[str] = []
+
+        if self._archive is None:
+            # Package is a directory.
+            offset = len(self._template_root)
+
+            for dirpath, _, filenames in os.walk(self._template_root):
+                dirpath = dirpath[offset:].lstrip(os.path.sep)
+                results.extend(
+                    os.path.join(dirpath, name).replace(os.path.sep, "/")
+                    for name in filenames
+                )
+        else:
+            if not hasattr(self._loader, "_files"):
+                raise TypeError(
+                    "This zip import does not have the required"
+                    " metadata to list templates."
+                )
+
+            # Package is a zip file.
+            prefix = (
+                self._template_root[len(self._archive) :].lstrip(os.path.sep)
+                + os.path.sep
+            )
+            offset = len(prefix)
+
+            for name in self._loader._files.keys():  # type: ignore
+                # Find names under the templates directory that aren't directories.
+                if name.startswith(prefix) and name[-1] != os.path.sep:
+                    results.append(name[offset:].replace(os.path.sep, "/"))
+
         results.sort()
         return results
 
 
 class DictLoader(BaseLoader):
-    """Loads a template from a python dict.  It's passed a dict of unicode
-    strings bound to template names.  This loader is useful for unittesting:
+    """Loads a template from a Python dict mapping template names to
+    template source.  This loader is useful for unittesting:
 
     >>> loader = DictLoader({'index.html': 'source here'})
 
     Because auto reloading is rarely useful this is disabled per default.
     """
 
-    def __init__(self, mapping):
+    def __init__(self, mapping: t.Mapping[str, str]) -> None:
         self.mapping = mapping
 
-    def get_source(self, environment, template):
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, None, t.Callable[[], bool]]:
         if template in self.mapping:
             source = self.mapping[template]
             return source, None, lambda: source == self.mapping.get(template)
         raise TemplateNotFound(template)
 
-    def list_templates(self):
+    def list_templates(self) -> t.List[str]:
         return sorted(self.mapping)
 
 
 class FunctionLoader(BaseLoader):
     """A loader that is passed a function which does the loading.  The
-    function becomes the name of the template passed and has to return either
-    an unicode string with the template source, a tuple in the form ``(source,
+    function receives the name of the template and has to return either
+    a string with the template source, a tuple in the form ``(source,
     filename, uptodatefunc)`` or `None` if the template does not exist.
 
     >>> def load_template(name):
@@ -297,15 +443,30 @@
     return value.
     """
 
-    def __init__(self, load_func):
+    def __init__(
+        self,
+        load_func: t.Callable[
+            [str],
+            t.Optional[
+                t.Union[
+                    str, t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]
+                ]
+            ],
+        ],
+    ) -> None:
         self.load_func = load_func
 
-    def get_source(self, environment, template):
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
         rv = self.load_func(template)
+
         if rv is None:
             raise TemplateNotFound(template)
-        elif isinstance(rv, string_types):
+
+        if isinstance(rv, str):
             return rv, None, None
+
         return rv
 
 
@@ -324,40 +485,49 @@
     by loading ``'app2/index.html'`` the file from the second.
     """
 
-    def __init__(self, mapping, delimiter='/'):
+    def __init__(
+        self, mapping: t.Mapping[str, BaseLoader], delimiter: str = "/"
+    ) -> None:
         self.mapping = mapping
         self.delimiter = delimiter
 
-    def get_loader(self, template):
+    def get_loader(self, template: str) -> t.Tuple[BaseLoader, str]:
         try:
             prefix, name = template.split(self.delimiter, 1)
             loader = self.mapping[prefix]
-        except (ValueError, KeyError):
-            raise TemplateNotFound(template)
+        except (ValueError, KeyError) as e:
+            raise TemplateNotFound(template) from e
         return loader, name
 
-    def get_source(self, environment, template):
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
         loader, name = self.get_loader(template)
         try:
             return loader.get_source(environment, name)
-        except TemplateNotFound:
-            # re-raise the exception with the correct fileame here.
+        except TemplateNotFound as e:
+            # re-raise the exception with the correct filename here.
             # (the one that includes the prefix)
-            raise TemplateNotFound(template)
+            raise TemplateNotFound(template) from e
 
     @internalcode
-    def load(self, environment, name, globals=None):
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
         loader, local_name = self.get_loader(name)
         try:
-            return loader.load(environment, local_name)
-        except TemplateNotFound:
-            # re-raise the exception with the correct fileame here.
+            return loader.load(environment, local_name, globals)
+        except TemplateNotFound as e:
+            # re-raise the exception with the correct filename here.
             # (the one that includes the prefix)
-            raise TemplateNotFound(name)
+            raise TemplateNotFound(name) from e
 
-    def list_templates(self):
+    def list_templates(self) -> t.List[str]:
         result = []
-        for prefix, loader in iteritems(self.mapping):
+        for prefix, loader in self.mapping.items():
             for template in loader.list_templates():
                 result.append(prefix + self.delimiter + template)
         return result
@@ -377,10 +547,12 @@
     from a different location.
     """
 
-    def __init__(self, loaders):
+    def __init__(self, loaders: t.Sequence[BaseLoader]) -> None:
         self.loaders = loaders
 
-    def get_source(self, environment, template):
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
         for loader in self.loaders:
             try:
                 return loader.get_source(environment, template)
@@ -389,7 +561,12 @@
         raise TemplateNotFound(template)
 
     @internalcode
-    def load(self, environment, name, globals=None):
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
         for loader in self.loaders:
             try:
                 return loader.load(environment, name, globals)
@@ -397,7 +574,7 @@
                 pass
         raise TemplateNotFound(name)
 
-    def list_templates(self):
+    def list_templates(self) -> t.List[str]:
         found = set()
         for loader in self.loaders:
             found.update(loader.list_templates())
@@ -423,20 +600,23 @@
 
     has_source_access = False
 
-    def __init__(self, path):
-        package_name = '_jinja2_module_templates_%x' % id(self)
+    def __init__(
+        self, path: t.Union[str, os.PathLike, t.Sequence[t.Union[str, os.PathLike]]]
+    ) -> None:
+        package_name = f"_jinja2_module_templates_{id(self):x}"
 
         # create a fake module that looks for the templates in the
         # path given.
         mod = _TemplateModule(package_name)
-        if isinstance(path, string_types):
-            path = [path]
-        else:
-            path = list(path)
-        mod.__path__ = path
 
-        sys.modules[package_name] = weakref.proxy(mod,
-            lambda x: sys.modules.pop(package_name, None))
+        if not isinstance(path, abc.Iterable) or isinstance(path, str):
+            path = [path]
+
+        mod.__path__ = [os.fspath(p) for p in path]
+
+        sys.modules[package_name] = weakref.proxy(
+            mod, lambda x: sys.modules.pop(package_name, None)
+        )
 
         # the only strong reference, the sys.modules entry is weak
         # so that the garbage collector can remove it once the
@@ -445,27 +625,37 @@
         self.package_name = package_name
 
     @staticmethod
-    def get_template_key(name):
-        return 'tmpl_' + sha1(name.encode('utf-8')).hexdigest()
+    def get_template_key(name: str) -> str:
+        return "tmpl_" + sha1(name.encode("utf-8")).hexdigest()
 
     @staticmethod
-    def get_module_filename(name):
-        return ModuleLoader.get_template_key(name) + '.py'
+    def get_module_filename(name: str) -> str:
+        return ModuleLoader.get_template_key(name) + ".py"
 
     @internalcode
-    def load(self, environment, name, globals=None):
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
         key = self.get_template_key(name)
-        module = '%s.%s' % (self.package_name, key)
+        module = f"{self.package_name}.{key}"
         mod = getattr(self.module, module, None)
+
         if mod is None:
             try:
-                mod = __import__(module, None, None, ['root'])
-            except ImportError:
-                raise TemplateNotFound(name)
+                mod = __import__(module, None, None, ["root"])
+            except ImportError as e:
+                raise TemplateNotFound(name) from e
 
             # remove the entry from sys.modules, we only want the attribute
             # on the module object we have stored on the loader.
             sys.modules.pop(module, None)
 
+        if globals is None:
+            globals = {}
+
         return environment.template_class.from_module_dict(
-            environment, mod.__dict__, globals)
+            environment, mod.__dict__, globals
+        )

meta.py

diff --git a/meta.py b/meta.py
index 3110cff..0057d6e 100644
--- a/meta.py
+++ b/meta.py
@@ -1,36 +1,36 @@
-# -*- coding: utf-8 -*-
+"""Functions that expose information about templates that might be
+interesting for introspection.
 """
-    jinja2.meta
-    ~~~~~~~~~~~
+import typing as t
 
-    This module implements various functions that exposes information about
-    templates that might be interesting for various kinds of applications.
+from . import nodes
+from .compiler import CodeGenerator
+from .compiler import Frame
 
-    :copyright: (c) 2010 by the Jinja Team, see AUTHORS for more details.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2 import nodes
-from jinja2.compiler import CodeGenerator
-from jinja2._compat import string_types
+if t.TYPE_CHECKING:
+    from .environment import Environment
 
 
 class TrackingCodeGenerator(CodeGenerator):
     """We abuse the code generator for introspection."""
 
-    def __init__(self, environment):
-        CodeGenerator.__init__(self, environment, '<introspection>',
-                               '<introspection>')
-        self.undeclared_identifiers = set()
+    def __init__(self, environment: "Environment") -> None:
+        super().__init__(environment, "<introspection>", "<introspection>")
+        self.undeclared_identifiers: t.Set[str] = set()
 
-    def write(self, x):
+    def write(self, x: str) -> None:
         """Don't write."""
 
-    def pull_locals(self, frame):
+    def enter_frame(self, frame: Frame) -> None:
         """Remember all undeclared identifiers."""
-        self.undeclared_identifiers.update(frame.identifiers.undeclared)
+        super().enter_frame(frame)
+
+        for _, (action, param) in frame.symbols.loads.items():
+            if action == "resolve" and param not in self.environment.globals:
+                self.undeclared_identifiers.add(param)
 
 
-def find_undeclared_variables(ast):
+def find_undeclared_variables(ast: nodes.Template) -> t.Set[str]:
     """Returns a set of all variables in the AST that will be looked up from
     the context at runtime.  Because at compile time it's not known which
     variables will be used depending on the path the execution takes at
@@ -39,8 +39,8 @@
     >>> from jinja2 import Environment, meta
     >>> env = Environment()
     >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}')
-    >>> meta.find_undeclared_variables(ast)
-    set(['bar'])
+    >>> meta.find_undeclared_variables(ast) == {'bar'}
+    True
 
     .. admonition:: Implementation
 
@@ -49,12 +49,16 @@
        :exc:`TemplateAssertionError` during compilation and as a matter of
        fact this function can currently raise that exception as well.
     """
-    codegen = TrackingCodeGenerator(ast.environment)
+    codegen = TrackingCodeGenerator(ast.environment)  # type: ignore
     codegen.visit(ast)
     return codegen.undeclared_identifiers
 
 
-def find_referenced_templates(ast):
+_ref_types = (nodes.Extends, nodes.FromImport, nodes.Import, nodes.Include)
+_RefType = t.Union[nodes.Extends, nodes.FromImport, nodes.Import, nodes.Include]
+
+
+def find_referenced_templates(ast: nodes.Template) -> t.Iterator[t.Optional[str]]:
     """Finds all the referenced templates from the AST.  This will return an
     iterator over all the hardcoded template extensions, inclusions and
     imports.  If dynamic inheritance or inclusion is used, `None` will be
@@ -69,16 +73,19 @@
     This function is useful for dependency tracking.  For example if you want
     to rebuild parts of the website after a layout template has changed.
     """
-    for node in ast.find_all((nodes.Extends, nodes.FromImport, nodes.Import,
-                              nodes.Include)):
-        if not isinstance(node.template, nodes.Const):
+    template_name: t.Any
+
+    for node in ast.find_all(_ref_types):
+        template: nodes.Expr = node.template  # type: ignore
+
+        if not isinstance(template, nodes.Const):
             # a tuple with some non consts in there
-            if isinstance(node.template, (nodes.Tuple, nodes.List)):
-                for template_name in node.template.items:
+            if isinstance(template, (nodes.Tuple, nodes.List)):
+                for template_name in template.items:
                     # something const, only yield the strings and ignore
                     # non-string consts that really just make no sense
                     if isinstance(template_name, nodes.Const):
-                        if isinstance(template_name.value, string_types):
+                        if isinstance(template_name.value, str):
                             yield template_name.value
                     # something dynamic in there
                     else:
@@ -88,15 +95,16 @@
                 yield None
             continue
         # constant is a basestring, direct template name
-        if isinstance(node.template.value, string_types):
-            yield node.template.value
+        if isinstance(template.value, str):
+            yield template.value
         # a tuple or list (latter *should* not happen) made of consts,
         # yield the consts that are strings.  We could warn here for
         # non string values
-        elif isinstance(node, nodes.Include) and \
-             isinstance(node.template.value, (tuple, list)):
-            for template_name in node.template.value:
-                if isinstance(template_name, string_types):
+        elif isinstance(node, nodes.Include) and isinstance(
+            template.value, (tuple, list)
+        ):
+            for template_name in template.value:
+                if isinstance(template_name, str):
                     yield template_name
         # something else we don't care about, we could warn here
         else:

nativetypes.py

diff --git a/nativetypes.py b/nativetypes.py
new file mode 100644
index 0000000..ac08610
--- /dev/null
+++ b/nativetypes.py
@@ -0,0 +1,130 @@
+import typing as t
+from ast import literal_eval
+from ast import parse
+from itertools import chain
+from itertools import islice
+from types import GeneratorType
+
+from . import nodes
+from .compiler import CodeGenerator
+from .compiler import Frame
+from .compiler import has_safe_repr
+from .environment import Environment
+from .environment import Template
+
+
+def native_concat(values: t.Iterable[t.Any]) -> t.Optional[t.Any]:
+    """Return a native Python type from the list of compiled nodes. If
+    the result is a single node, its value is returned. Otherwise, the
+    nodes are concatenated as strings. If the result can be parsed with
+    :func:`ast.literal_eval`, the parsed value is returned. Otherwise,
+    the string is returned.
+
+    :param values: Iterable of outputs to concatenate.
+    """
+    head = list(islice(values, 2))
+
+    if not head:
+        return None
+
+    if len(head) == 1:
+        raw = head[0]
+        if not isinstance(raw, str):
+            return raw
+    else:
+        if isinstance(values, GeneratorType):
+            values = chain(head, values)
+        raw = "".join([str(v) for v in values])
+
+    try:
+        return literal_eval(
+            # In Python 3.10+ ast.literal_eval removes leading spaces/tabs
+            # from the given string. For backwards compatibility we need to
+            # parse the string ourselves without removing leading spaces/tabs.
+            parse(raw, mode="eval")
+        )
+    except (ValueError, SyntaxError, MemoryError):
+        return raw
+
+
+class NativeCodeGenerator(CodeGenerator):
+    """A code generator which renders Python types by not adding
+    ``str()`` around output nodes.
+    """
+
+    @staticmethod
+    def _default_finalize(value: t.Any) -> t.Any:
+        return value
+
+    def _output_const_repr(self, group: t.Iterable[t.Any]) -> str:
+        return repr("".join([str(v) for v in group]))
+
+    def _output_child_to_const(
+        self, node: nodes.Expr, frame: Frame, finalize: CodeGenerator._FinalizeInfo
+    ) -> t.Any:
+        const = node.as_const(frame.eval_ctx)
+
+        if not has_safe_repr(const):
+            raise nodes.Impossible()
+
+        if isinstance(node, nodes.TemplateData):
+            return const
+
+        return finalize.const(const)  # type: ignore
+
+    def _output_child_pre(
+        self, node: nodes.Expr, frame: Frame, finalize: CodeGenerator._FinalizeInfo
+    ) -> None:
+        if finalize.src is not None:
+            self.write(finalize.src)
+
+    def _output_child_post(
+        self, node: nodes.Expr, frame: Frame, finalize: CodeGenerator._FinalizeInfo
+    ) -> None:
+        if finalize.src is not None:
+            self.write(")")
+
+
+class NativeEnvironment(Environment):
+    """An environment that renders templates to native Python types."""
+
+    code_generator_class = NativeCodeGenerator
+    concat = staticmethod(native_concat)  # type: ignore
+
+
+class NativeTemplate(Template):
+    environment_class = NativeEnvironment
+
+    def render(self, *args: t.Any, **kwargs: t.Any) -> t.Any:
+        """Render the template to produce a native Python type. If the
+        result is a single node, its value is returned. Otherwise, the
+        nodes are concatenated as strings. If the result can be parsed
+        with :func:`ast.literal_eval`, the parsed value is returned.
+        Otherwise, the string is returned.
+        """
+        ctx = self.new_context(dict(*args, **kwargs))
+
+        try:
+            return self.environment_class.concat(  # type: ignore
+                self.root_render_func(ctx)  # type: ignore
+            )
+        except Exception:
+            return self.environment.handle_exception()
+
+    async def render_async(self, *args: t.Any, **kwargs: t.Any) -> t.Any:
+        if not self.environment.is_async:
+            raise RuntimeError(
+                "The environment was not created with async mode enabled."
+            )
+
+        ctx = self.new_context(dict(*args, **kwargs))
+
+        try:
+            return self.environment_class.concat(  # type: ignore
+                [n async for n in self.root_render_func(ctx)]  # type: ignore
+            )
+        except Exception:
+            return self.environment.handle_exception()
+
+
+NativeEnvironment.template_class = NativeTemplate

nodes.py

diff --git a/nodes.py b/nodes.py
index c5697e6..b2f88d9 100644
--- a/nodes.py
+++ b/nodes.py
@@ -1,54 +1,47 @@
-# -*- coding: utf-8 -*-
+"""AST nodes generated by the parser for the compiler. Also provides
+some node tree helper functions used by the parser and compiler in order
+to normalize nodes.
 """
-    jinja2.nodes
-    ~~~~~~~~~~~~
-
-    This module implements additional nodes derived from the ast base node.
-
-    It also provides some node tree helper functions like `in_lineno` and
-    `get_nodes` used by the parser and translator in order to normalize
-    python and jinja nodes.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
+import inspect
 import operator
-
+import typing as t
 from collections import deque
-from jinja2.utils import Markup
-from jinja2._compat import next, izip, with_metaclass, text_type, \
-     method_type, function_type
 
+from markupsafe import Markup
 
-#: the types we support for context functions
-_context_function_types = (function_type, method_type)
+from .utils import _PassArg
 
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .environment import Environment
 
-_binop_to_func = {
-    '*':        operator.mul,
-    '/':        operator.truediv,
-    '//':       operator.floordiv,
-    '**':       operator.pow,
-    '%':        operator.mod,
-    '+':        operator.add,
-    '-':        operator.sub
+_NodeBound = t.TypeVar("_NodeBound", bound="Node")
+
+_binop_to_func: t.Dict[str, t.Callable[[t.Any, t.Any], t.Any]] = {
+    "*": operator.mul,
+    "/": operator.truediv,
+    "//": operator.floordiv,
+    "**": operator.pow,
+    "%": operator.mod,
+    "+": operator.add,
+    "-": operator.sub,
 }
 
-_uaop_to_func = {
-    'not':      operator.not_,
-    '+':        operator.pos,
-    '-':        operator.neg
+_uaop_to_func: t.Dict[str, t.Callable[[t.Any], t.Any]] = {
+    "not": operator.not_,
+    "+": operator.pos,
+    "-": operator.neg,
 }
 
-_cmpop_to_func = {
-    'eq':       operator.eq,
-    'ne':       operator.ne,
-    'gt':       operator.gt,
-    'gteq':     operator.ge,
-    'lt':       operator.lt,
-    'lteq':     operator.le,
-    'in':       lambda a, b: a in b,
-    'notin':    lambda a, b: a not in b
+_cmpop_to_func: t.Dict[str, t.Callable[[t.Any, t.Any], t.Any]] = {
+    "eq": operator.eq,
+    "ne": operator.ne,
+    "gt": operator.gt,
+    "gteq": operator.ge,
+    "lt": operator.lt,
+    "lteq": operator.le,
+    "in": lambda a, b: a in b,
+    "notin": lambda a, b: a not in b,
 }
 
 
@@ -61,24 +54,26 @@
     inheritance.  fields and attributes from the parent class are
     automatically forwarded to the child."""
 
-    def __new__(cls, name, bases, d):
-        for attr in 'fields', 'attributes':
+    def __new__(mcs, name, bases, d):  # type: ignore
+        for attr in "fields", "attributes":
             storage = []
-            storage.extend(getattr(bases[0], attr, ()))
+            storage.extend(getattr(bases[0] if bases else object, attr, ()))
             storage.extend(d.get(attr, ()))
-            assert len(bases) == 1, 'multiple inheritance not allowed'
-            assert len(storage) == len(set(storage)), 'layout conflict'
+            assert len(bases) <= 1, "multiple inheritance not allowed"
+            assert len(storage) == len(set(storage)), "layout conflict"
             d[attr] = tuple(storage)
-        d.setdefault('abstract', False)
-        return type.__new__(cls, name, bases, d)
+        d.setdefault("abstract", False)
+        return type.__new__(mcs, name, bases, d)
 
 
-class EvalContext(object):
+class EvalContext:
     """Holds evaluation time information.  Custom attributes can be attached
     to it in extensions.
     """
 
-    def __init__(self, environment, template_name=None):
+    def __init__(
+        self, environment: "Environment", template_name: t.Optional[str] = None
+    ) -> None:
         self.environment = environment
         if callable(environment.autoescape):
             self.autoescape = environment.autoescape(template_name)
@@ -86,26 +81,27 @@
             self.autoescape = environment.autoescape
         self.volatile = False
 
-    def save(self):
+    def save(self) -> t.Mapping[str, t.Any]:
         return self.__dict__.copy()
 
-    def revert(self, old):
+    def revert(self, old: t.Mapping[str, t.Any]) -> None:
         self.__dict__.clear()
         self.__dict__.update(old)
 
 
-def get_eval_context(node, ctx):
+def get_eval_context(node: "Node", ctx: t.Optional[EvalContext]) -> EvalContext:
     if ctx is None:
         if node.environment is None:
-            raise RuntimeError('if no eval context is passed, the '
-                               'node must have an attached '
-                               'environment.')
+            raise RuntimeError(
+                "if no eval context is passed, the node must have an"
+                " attached environment."
+            )
         return EvalContext(node.environment)
     return ctx
 
 
-class Node(with_metaclass(NodeType, object)):
-    """Baseclass for all Jinja2 nodes.  There are a number of nodes available
+class Node(metaclass=NodeType):
+    """Baseclass for all Jinja nodes.  There are a number of nodes available
     of different types.  There are four major types:
 
     -   :class:`Stmt`: statements
@@ -120,32 +116,37 @@
     The `environment` attribute is set at the end of the parsing process for
     all nodes automatically.
     """
-    fields = ()
-    attributes = ('lineno', 'environment')
+
+    fields: t.Tuple[str, ...] = ()
+    attributes: t.Tuple[str, ...] = ("lineno", "environment")
     abstract = True
 
-    def __init__(self, *fields, **attributes):
+    lineno: int
+    environment: t.Optional["Environment"]
+
+    def __init__(self, *fields: t.Any, **attributes: t.Any) -> None:
         if self.abstract:
-            raise TypeError('abstract nodes are not instanciable')
+            raise TypeError("abstract nodes are not instantiable")
         if fields:
             if len(fields) != len(self.fields):
                 if not self.fields:
-                    raise TypeError('%r takes 0 arguments' %
-                                    self.__class__.__name__)
-                raise TypeError('%r takes 0 or %d argument%s' % (
-                    self.__class__.__name__,
-                    len(self.fields),
-                    len(self.fields) != 1 and 's' or ''
-                ))
-            for name, arg in izip(self.fields, fields):
+                    raise TypeError(f"{type(self).__name__!r} takes 0 arguments")
+                raise TypeError(
+                    f"{type(self).__name__!r} takes 0 or {len(self.fields)}"
+                    f" argument{'s' if len(self.fields) != 1 else ''}"
+                )
+            for name, arg in zip(self.fields, fields):
                 setattr(self, name, arg)
         for attr in self.attributes:
             setattr(self, attr, attributes.pop(attr, None))
         if attributes:
-            raise TypeError('unknown attribute %r' %
-                            next(iter(attributes)))
+            raise TypeError(f"unknown attribute {next(iter(attributes))!r}")
 
-    def iter_fields(self, exclude=None, only=None):
+    def iter_fields(
+        self,
+        exclude: t.Optional[t.Container[str]] = None,
+        only: t.Optional[t.Container[str]] = None,
+    ) -> t.Iterator[t.Tuple[str, t.Any]]:
         """This method iterates over all fields that are defined and yields
         ``(key, value)`` tuples.  Per default all fields are returned, but
         it's possible to limit that to some fields by providing the `only`
@@ -153,20 +154,26 @@
         should be sets or tuples of field names.
         """
         for name in self.fields:
-            if (exclude is only is None) or \
-               (exclude is not None and name not in exclude) or \
-               (only is not None and name in only):
+            if (
+                (exclude is None and only is None)
+                or (exclude is not None and name not in exclude)
+                or (only is not None and name in only)
+            ):
                 try:
                     yield name, getattr(self, name)
                 except AttributeError:
                     pass
 
-    def iter_child_nodes(self, exclude=None, only=None):
+    def iter_child_nodes(
+        self,
+        exclude: t.Optional[t.Container[str]] = None,
+        only: t.Optional[t.Container[str]] = None,
+    ) -> t.Iterator["Node"]:
         """Iterates over all direct child nodes of the node.  This iterates
         over all fields and yields the values of they are nodes.  If the value
         of a field is a list all the nodes in that list are returned.
         """
-        for field, item in self.iter_fields(exclude, only):
+        for _, item in self.iter_fields(exclude, only):
             if isinstance(item, list):
                 for n in item:
                     if isinstance(n, Node):
@@ -174,24 +181,27 @@
             elif isinstance(item, Node):
                 yield item
 
-    def find(self, node_type):
+    def find(self, node_type: t.Type[_NodeBound]) -> t.Optional[_NodeBound]:
         """Find the first node of a given type.  If no such node exists the
         return value is `None`.
         """
         for result in self.find_all(node_type):
             return result
 
-    def find_all(self, node_type):
+        return None
+
+    def find_all(
+        self, node_type: t.Union[t.Type[_NodeBound], t.Tuple[t.Type[_NodeBound], ...]]
+    ) -> t.Iterator[_NodeBound]:
         """Find all the nodes of a given type.  If the type is a tuple,
         the check is performed for any of the tuple items.
         """
         for child in self.iter_child_nodes():
             if isinstance(child, node_type):
-                yield child
-            for result in child.find_all(node_type):
-                yield result
+                yield child  # type: ignore
+            yield from child.find_all(node_type)
 
-    def set_ctx(self, ctx):
+    def set_ctx(self, ctx: str) -> "Node":
         """Reset the context of a node and all child nodes.  Per default the
         parser will all generate nodes that have a 'load' context as it's the
         most common one.  This method is used in the parser to set assignment
@@ -200,23 +210,23 @@
         todo = deque([self])
         while todo:
             node = todo.popleft()
-            if 'ctx' in node.fields:
-                node.ctx = ctx
+            if "ctx" in node.fields:
+                node.ctx = ctx  # type: ignore
             todo.extend(node.iter_child_nodes())
         return self
 
-    def set_lineno(self, lineno, override=False):
+    def set_lineno(self, lineno: int, override: bool = False) -> "Node":
         """Set the line numbers of the node and children."""
         todo = deque([self])
         while todo:
             node = todo.popleft()
-            if 'lineno' in node.attributes:
+            if "lineno" in node.attributes:
                 if node.lineno is None or override:
                     node.lineno = lineno
             todo.extend(node.iter_child_nodes())
         return self
 
-    def set_environment(self, environment):
+    def set_environment(self, environment: "Environment") -> "Node":
         """Set the environment for all nodes."""
         todo = deque([self])
         while todo:
@@ -225,31 +235,57 @@
             todo.extend(node.iter_child_nodes())
         return self
 
-    def __eq__(self, other):
-        return type(self) is type(other) and \
-               tuple(self.iter_fields()) == tuple(other.iter_fields())
+    def __eq__(self, other: t.Any) -> bool:
+        if type(self) is not type(other):
+            return NotImplemented
 
-    def __ne__(self, other):
-        return not self.__eq__(other)
+        return tuple(self.iter_fields()) == tuple(other.iter_fields())
 
-    # Restore Python 2 hashing behavior on Python 3
     __hash__ = object.__hash__
 
-    def __repr__(self):
-        return '%s(%s)' % (
-            self.__class__.__name__,
-            ', '.join('%s=%r' % (arg, getattr(self, arg, None)) for
-                      arg in self.fields)
-        )
+    def __repr__(self) -> str:
+        args_str = ", ".join(f"{a}={getattr(self, a, None)!r}" for a in self.fields)
+        return f"{type(self).__name__}({args_str})"
+
+    def dump(self) -> str:
+        def _dump(node: t.Union[Node, t.Any]) -> None:
+            if not isinstance(node, Node):
+                buf.append(repr(node))
+                return
+
+            buf.append(f"nodes.{type(node).__name__}(")
+            if not node.fields:
+                buf.append(")")
+                return
+            for idx, field in enumerate(node.fields):
+                if idx:
+                    buf.append(", ")
+                value = getattr(node, field)
+                if isinstance(value, list):
+                    buf.append("[")
+                    for idx, item in enumerate(value):
+                        if idx:
+                            buf.append(", ")
+                        _dump(item)
+                    buf.append("]")
+                else:
+                    _dump(value)
+            buf.append(")")
+
+        buf: t.List[str] = []
+        _dump(self)
+        return "".join(buf)
 
 
 class Stmt(Node):
     """Base node for all statements."""
+
     abstract = True
 
 
 class Helper(Node):
     """Nodes that exist in a specific context only."""
+
     abstract = True
 
 
@@ -257,19 +293,25 @@
     """Node that represents a template.  This must be the outermost node that
     is passed to the compiler.
     """
-    fields = ('body',)
+
+    fields = ("body",)
+    body: t.List[Node]
 
 
 class Output(Stmt):
     """A node that holds multiple expressions which are then printed out.
     This is used both for the `print` statement and the regular template data.
     """
-    fields = ('nodes',)
+
+    fields = ("nodes",)
+    nodes: t.List["Expr"]
 
 
 class Extends(Stmt):
     """Represents an extends statement."""
-    fields = ('template',)
+
+    fields = ("template",)
+    template: "Expr"
 
 
 class For(Stmt):
@@ -280,12 +322,24 @@
 
     For filtered nodes an expression can be stored as `test`, otherwise `None`.
     """
-    fields = ('target', 'iter', 'body', 'else_', 'test', 'recursive')
+
+    fields = ("target", "iter", "body", "else_", "test", "recursive")
+    target: Node
+    iter: Node
+    body: t.List[Node]
+    else_: t.List[Node]
+    test: t.Optional[Node]
+    recursive: bool
 
 
 class If(Stmt):
     """If `test` is true, `body` is rendered, else `else_`."""
-    fields = ('test', 'body', 'else_')
+
+    fields = ("test", "body", "elif_", "else_")
+    test: Node
+    body: t.List[Node]
+    elif_: t.List["If"]
+    else_: t.List[Node]
 
 
 class Macro(Stmt):
@@ -293,34 +347,77 @@
     arguments and `defaults` a list of defaults if there are any.  `body` is
     a list of nodes for the macro body.
     """
-    fields = ('name', 'args', 'defaults', 'body')
+
+    fields = ("name", "args", "defaults", "body")
+    name: str
+    args: t.List["Name"]
+    defaults: t.List["Expr"]
+    body: t.List[Node]
 
 
 class CallBlock(Stmt):
     """Like a macro without a name but a call instead.  `call` is called with
     the unnamed macro as `caller` argument this node holds.
     """
-    fields = ('call', 'args', 'defaults', 'body')
+
+    fields = ("call", "args", "defaults", "body")
+    call: "Call"
+    args: t.List["Name"]
+    defaults: t.List["Expr"]
+    body: t.List[Node]
 
 
 class FilterBlock(Stmt):
     """Node for filter sections."""
-    fields = ('body', 'filter')
+
+    fields = ("body", "filter")
+    body: t.List[Node]
+    filter: "Filter"
+
+
+class With(Stmt):
+    """Specific node for with statements.  In older versions of Jinja the
+    with statement was implemented on the base of the `Scope` node instead.
+
+    .. versionadded:: 2.9.3
+    """
+
+    fields = ("targets", "values", "body")
+    targets: t.List["Expr"]
+    values: t.List["Expr"]
+    body: t.List[Node]
 
 
 class Block(Stmt):
-    """A node that represents a block."""
-    fields = ('name', 'body', 'scoped')
+    """A node that represents a block.
+
+    .. versionchanged:: 3.0.0
+        the `required` field was added.
+    """
+
+    fields = ("name", "body", "scoped", "required")
+    name: str
+    body: t.List[Node]
+    scoped: bool
+    required: bool
 
 
 class Include(Stmt):
     """A node that represents the include tag."""
-    fields = ('template', 'with_context', 'ignore_missing')
+
+    fields = ("template", "with_context", "ignore_missing")
+    template: "Expr"
+    with_context: bool
+    ignore_missing: bool
 
 
 class Import(Stmt):
     """A node that represents the import tag."""
-    fields = ('template', 'target', 'with_context')
+
+    fields = ("template", "target", "with_context")
+    template: "Expr"
+    target: str
+    with_context: bool
 
 
 class FromImport(Stmt):
@@ -334,24 +431,43 @@
 
     The list of names may contain tuples if aliases are wanted.
     """
-    fields = ('template', 'names', 'with_context')
+
+    fields = ("template", "names", "with_context")
+    template: "Expr"
+    names: t.List[t.Union[str, t.Tuple[str, str]]]
+    with_context: bool
 
 
 class ExprStmt(Stmt):
     """A statement that evaluates an expression and discards the result."""
-    fields = ('node',)
+
+    fields = ("node",)
+    node: Node
 
 
 class Assign(Stmt):
     """Assigns an expression to a target."""
-    fields = ('target', 'node')
+
+    fields = ("target", "node")
+    target: "Expr"
+    node: Node
+
+
+class AssignBlock(Stmt):
+    """Assigns a block to a target."""
+
+    fields = ("target", "filter", "body")
+    target: "Expr"
+    filter: t.Optional["Filter"]
+    body: t.List[Node]
 
 
 class Expr(Node):
     """Baseclass for all expressions."""
+
     abstract = True
 
-    def as_const(self, eval_ctx=None):
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         """Return the value of the expression as constant or raise
         :exc:`Impossible` if this was not possible.
 
@@ -364,47 +480,58 @@
         """
         raise Impossible()
 
-    def can_assign(self):
+    def can_assign(self) -> bool:
         """Check if it's possible to assign something to this node."""
         return False
 
 
 class BinExpr(Expr):
     """Baseclass for all binary expressions."""
-    fields = ('left', 'right')
-    operator = None
+
+    fields = ("left", "right")
+    left: Expr
+    right: Expr
+    operator: str
     abstract = True
 
-    def as_const(self, eval_ctx=None):
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         eval_ctx = get_eval_context(self, eval_ctx)
+
         # intercepted operators cannot be folded at compile time
-        if self.environment.sandboxed and \
-           self.operator in self.environment.intercepted_binops:
+        if (
+            eval_ctx.environment.sandboxed
+            and self.operator in eval_ctx.environment.intercepted_binops  # type: ignore
+        ):
             raise Impossible()
         f = _binop_to_func[self.operator]
         try:
             return f(self.left.as_const(eval_ctx), self.right.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
+        except Exception as e:
+            raise Impossible() from e
 
 
 class UnaryExpr(Expr):
     """Baseclass for all unary expressions."""
-    fields = ('node',)
-    operator = None
+
+    fields = ("node",)
+    node: Expr
+    operator: str
     abstract = True
 
-    def as_const(self, eval_ctx=None):
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         eval_ctx = get_eval_context(self, eval_ctx)
+
         # intercepted operators cannot be folded at compile time
-        if self.environment.sandboxed and \
-           self.operator in self.environment.intercepted_unops:
+        if (
+            eval_ctx.environment.sandboxed
+            and self.operator in eval_ctx.environment.intercepted_unops  # type: ignore
+        ):
             raise Impossible()
         f = _uaop_to_func[self.operator]
         try:
             return f(self.node.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
+        except Exception as e:
+            raise Impossible() from e
 
 
 class Name(Expr):
@@ -415,15 +542,33 @@
     -   `load`: load that name
     -   `param`: like `store` but if the name was defined as function parameter.
     """
-    fields = ('name', 'ctx')
 
-    def can_assign(self):
-        return self.name not in ('true', 'false', 'none',
-                                 'True', 'False', 'None')
+    fields = ("name", "ctx")
+    name: str
+    ctx: str
+
+    def can_assign(self) -> bool:
+        return self.name not in {"true", "false", "none", "True", "False", "None"}
+
+
+class NSRef(Expr):
+    """Reference to a namespace value assignment"""
+
+    fields = ("name", "attr")
+    name: str
+    attr: str
+
+    def can_assign(self) -> bool:
+        # We don't need any special checks here; NSRef assignments have a
+        # runtime check to ensure the target is a namespace object which will
+        # have been checked already as it is created using a normal assignment
+        # which goes through a `Name` node.
+        return True
 
 
 class Literal(Expr):
     """Baseclass for literals."""
+
     abstract = True
 
 
@@ -433,18 +578,26 @@
     complex values such as lists too.  Only constants with a safe
     representation (objects where ``eval(repr(x)) == x`` is true).
     """
-    fields = ('value',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("value",)
+    value: t.Any
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         return self.value
 
     @classmethod
-    def from_untrusted(cls, value, lineno=None, environment=None):
+    def from_untrusted(
+        cls,
+        value: t.Any,
+        lineno: t.Optional[int] = None,
+        environment: "t.Optional[Environment]" = None,
+    ) -> "Const":
         """Return a const object if the value is representable as
         constant value in the generated code, otherwise it will raise
         an `Impossible` exception.
         """
         from .compiler import has_safe_repr
+
         if not has_safe_repr(value):
             raise Impossible()
         return cls(value, lineno=lineno, environment=environment)
@@ -452,9 +605,11 @@
 
 class TemplateData(Literal):
     """A constant template string."""
-    fields = ('data',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("data",)
+    data: str
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> str:
         eval_ctx = get_eval_context(self, eval_ctx)
         if eval_ctx.volatile:
             raise Impossible()
@@ -468,13 +623,16 @@
     for subscripts.  Like for :class:`Name` `ctx` specifies if the tuple
     is used for loading the names or storing.
     """
-    fields = ('items', 'ctx')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("items", "ctx")
+    items: t.List[Expr]
+    ctx: str
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Tuple[t.Any, ...]:
         eval_ctx = get_eval_context(self, eval_ctx)
         return tuple(x.as_const(eval_ctx) for x in self.items)
 
-    def can_assign(self):
+    def can_assign(self) -> bool:
         for item in self.items:
             if not item.can_assign():
                 return False
@@ -483,9 +641,11 @@
 
 class List(Literal):
     """Any list literal such as ``[1, 2, 3]``"""
-    fields = ('items',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("items",)
+    items: t.List[Expr]
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.List[t.Any]:
         eval_ctx = get_eval_context(self, eval_ctx)
         return [x.as_const(eval_ctx) for x in self.items]
 
@@ -494,27 +654,39 @@
     """Any dict literal such as ``{1: 2, 3: 4}``.  The items must be a list of
     :class:`Pair` nodes.
     """
-    fields = ('items',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("items",)
+    items: t.List["Pair"]
+
+    def as_const(
+        self, eval_ctx: t.Optional[EvalContext] = None
+    ) -> t.Dict[t.Any, t.Any]:
         eval_ctx = get_eval_context(self, eval_ctx)
         return dict(x.as_const(eval_ctx) for x in self.items)
 
 
 class Pair(Helper):
     """A key, value pair for dicts."""
-    fields = ('key', 'value')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("key", "value")
+    key: Expr
+    value: Expr
+
+    def as_const(
+        self, eval_ctx: t.Optional[EvalContext] = None
+    ) -> t.Tuple[t.Any, t.Any]:
         eval_ctx = get_eval_context(self, eval_ctx)
         return self.key.as_const(eval_ctx), self.value.as_const(eval_ctx)
 
 
 class Keyword(Helper):
     """A key, value pair for keyword arguments where key is a string."""
-    fields = ('key', 'value')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("key", "value")
+    key: str
+    value: Expr
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Tuple[str, t.Any]:
         eval_ctx = get_eval_context(self, eval_ctx)
         return self.key, self.value.as_const(eval_ctx)
 
@@ -523,9 +695,13 @@
     """A conditional expression (inline if expression).  (``{{
     foo if bar else baz }}``)
     """
-    fields = ('test', 'expr1', 'expr2')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("test", "expr1", "expr2")
+    test: Expr
+    expr1: Expr
+    expr2: t.Optional[Expr]
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         eval_ctx = get_eval_context(self, eval_ctx)
         if self.test.as_const(eval_ctx):
             return self.expr1.as_const(eval_ctx)
@@ -537,55 +713,103 @@
         return self.expr2.as_const(eval_ctx)
 
 
-class Filter(Expr):
-    """This node applies a filter on an expression.  `name` is the name of
-    the filter, the rest of the fields are the same as for :class:`Call`.
+def args_as_const(
+    node: t.Union["_FilterTestCommon", "Call"], eval_ctx: t.Optional[EvalContext]
+) -> t.Tuple[t.List[t.Any], t.Dict[t.Any, t.Any]]:
+    args = [x.as_const(eval_ctx) for x in node.args]
+    kwargs = dict(x.as_const(eval_ctx) for x in node.kwargs)
 
-    If the `node` of a filter is `None` the contents of the last buffer are
-    filtered.  Buffers are created by macros and filter blocks.
-    """
-    fields = ('node', 'name', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        if eval_ctx.volatile or self.node is None:
-            raise Impossible()
-        # we have to be careful here because we call filter_ below.
-        # if this variable would be called filter, 2to3 would wrap the
-        # call in a list beause it is assuming we are talking about the
-        # builtin filter function here which no longer returns a list in
-        # python 3.  because of that, do not rename filter_ to filter!
-        filter_ = self.environment.filters.get(self.name)
-        if filter_ is None or getattr(filter_, 'contextfilter', False):
-            raise Impossible()
-        obj = self.node.as_const(eval_ctx)
-        args = [x.as_const(eval_ctx) for x in self.args]
-        if getattr(filter_, 'evalcontextfilter', False):
-            args.insert(0, eval_ctx)
-        elif getattr(filter_, 'environmentfilter', False):
-            args.insert(0, self.environment)
-        kwargs = dict(x.as_const(eval_ctx) for x in self.kwargs)
-        if self.dyn_args is not None:
-            try:
-                args.extend(self.dyn_args.as_const(eval_ctx))
-            except Exception:
-                raise Impossible()
-        if self.dyn_kwargs is not None:
-            try:
-                kwargs.update(self.dyn_kwargs.as_const(eval_ctx))
-            except Exception:
-                raise Impossible()
+    if node.dyn_args is not None:
         try:
-            return filter_(obj, *args, **kwargs)
-        except Exception:
+            args.extend(node.dyn_args.as_const(eval_ctx))
+        except Exception as e:
+            raise Impossible() from e
+
+    if node.dyn_kwargs is not None:
+        try:
+            kwargs.update(node.dyn_kwargs.as_const(eval_ctx))
+        except Exception as e:
+            raise Impossible() from e
+
+    return args, kwargs
+
+
+class _FilterTestCommon(Expr):
+    fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
+    node: Expr
+    name: str
+    args: t.List[Expr]
+    kwargs: t.List[Pair]
+    dyn_args: t.Optional[Expr]
+    dyn_kwargs: t.Optional[Expr]
+    abstract = True
+    _is_filter = True
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
+        eval_ctx = get_eval_context(self, eval_ctx)
+
+        if eval_ctx.volatile:
             raise Impossible()
 
+        if self._is_filter:
+            env_map = eval_ctx.environment.filters
+        else:
+            env_map = eval_ctx.environment.tests
 
-class Test(Expr):
-    """Applies a test on an expression.  `name` is the name of the test, the
-    rest of the fields are the same as for :class:`Call`.
+        func = env_map.get(self.name)
+        pass_arg = _PassArg.from_obj(func)  # type: ignore
+
+        if func is None or pass_arg is _PassArg.context:
+            raise Impossible()
+
+        if eval_ctx.environment.is_async and (
+            getattr(func, "jinja_async_variant", False) is True
+            or inspect.iscoroutinefunction(func)
+        ):
+            raise Impossible()
+
+        args, kwargs = args_as_const(self, eval_ctx)
+        args.insert(0, self.node.as_const(eval_ctx))
+
+        if pass_arg is _PassArg.eval_context:
+            args.insert(0, eval_ctx)
+        elif pass_arg is _PassArg.environment:
+            args.insert(0, eval_ctx.environment)
+
+        try:
+            return func(*args, **kwargs)
+        except Exception as e:
+            raise Impossible() from e
+
+
+class Filter(_FilterTestCommon):
+    """Apply a filter to an expression. ``name`` is the name of the
+    filter, the other fields are the same as :class:`Call`.
+
+    If ``node`` is ``None``, the filter is being used in a filter block
+    and is applied to the content of the block.
     """
-    fields = ('node', 'name', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
+
+    node: t.Optional[Expr]  # type: ignore
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
+        if self.node is None:
+            raise Impossible()
+
+        return super().as_const(eval_ctx=eval_ctx)
+
+
+class Test(_FilterTestCommon):
+    """Apply a test to an expression. ``name`` is the name of the test,
+    the other field are the same as :class:`Call`.
+
+    .. versionchanged:: 3.0
+        ``as_const`` shares the same logic for filters and tests. Tests
+        check for volatile, async, and ``@pass_context`` etc.
+        decorators.
+    """
+
+    _is_filter = False
 
 
 class Call(Expr):
@@ -595,202 +819,209 @@
     node for dynamic positional (``*args``) or keyword (``**kwargs``)
     arguments.
     """
-    fields = ('node', 'args', 'kwargs', 'dyn_args', 'dyn_kwargs')
 
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        if eval_ctx.volatile:
-            raise Impossible()
-        obj = self.node.as_const(eval_ctx)
-
-        # don't evaluate context functions
-        args = [x.as_const(eval_ctx) for x in self.args]
-        if isinstance(obj, _context_function_types):
-            if getattr(obj, 'contextfunction', False):
-                raise Impossible()
-            elif getattr(obj, 'evalcontextfunction', False):
-                args.insert(0, eval_ctx)
-            elif getattr(obj, 'environmentfunction', False):
-                args.insert(0, self.environment)
-
-        kwargs = dict(x.as_const(eval_ctx) for x in self.kwargs)
-        if self.dyn_args is not None:
-            try:
-                args.extend(self.dyn_args.as_const(eval_ctx))
-            except Exception:
-                raise Impossible()
-        if self.dyn_kwargs is not None:
-            try:
-                kwargs.update(self.dyn_kwargs.as_const(eval_ctx))
-            except Exception:
-                raise Impossible()
-        try:
-            return obj(*args, **kwargs)
-        except Exception:
-            raise Impossible()
+    fields = ("node", "args", "kwargs", "dyn_args", "dyn_kwargs")
+    node: Expr
+    args: t.List[Expr]
+    kwargs: t.List[Keyword]
+    dyn_args: t.Optional[Expr]
+    dyn_kwargs: t.Optional[Expr]
 
 
 class Getitem(Expr):
     """Get an attribute or item from an expression and prefer the item."""
-    fields = ('node', 'arg', 'ctx')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("node", "arg", "ctx")
+    node: Expr
+    arg: Expr
+    ctx: str
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
+        if self.ctx != "load":
+            raise Impossible()
+
         eval_ctx = get_eval_context(self, eval_ctx)
-        if self.ctx != 'load':
-            raise Impossible()
-        try:
-            return self.environment.getitem(self.node.as_const(eval_ctx),
-                                            self.arg.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
 
-    def can_assign(self):
-        return False
+        try:
+            return eval_ctx.environment.getitem(
+                self.node.as_const(eval_ctx), self.arg.as_const(eval_ctx)
+            )
+        except Exception as e:
+            raise Impossible() from e
 
 
 class Getattr(Expr):
     """Get an attribute or item from an expression that is a ascii-only
     bytestring and prefer the attribute.
     """
-    fields = ('node', 'attr', 'ctx')
 
-    def as_const(self, eval_ctx=None):
-        if self.ctx != 'load':
+    fields = ("node", "attr", "ctx")
+    node: Expr
+    attr: str
+    ctx: str
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
+        if self.ctx != "load":
             raise Impossible()
+
+        eval_ctx = get_eval_context(self, eval_ctx)
+
         try:
-            eval_ctx = get_eval_context(self, eval_ctx)
-            return self.environment.getattr(self.node.as_const(eval_ctx),
-                                            self.attr)
-        except Exception:
-            raise Impossible()
-
-    def can_assign(self):
-        return False
+            return eval_ctx.environment.getattr(self.node.as_const(eval_ctx), self.attr)
+        except Exception as e:
+            raise Impossible() from e
 
 
 class Slice(Expr):
     """Represents a slice object.  This must only be used as argument for
     :class:`Subscript`.
     """
-    fields = ('start', 'stop', 'step')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("start", "stop", "step")
+    start: t.Optional[Expr]
+    stop: t.Optional[Expr]
+    step: t.Optional[Expr]
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> slice:
         eval_ctx = get_eval_context(self, eval_ctx)
-        def const(obj):
+
+        def const(obj: t.Optional[Expr]) -> t.Optional[t.Any]:
             if obj is None:
                 return None
             return obj.as_const(eval_ctx)
+
         return slice(const(self.start), const(self.stop), const(self.step))
 
 
 class Concat(Expr):
-    """Concatenates the list of expressions provided after converting them to
-    unicode.
+    """Concatenates the list of expressions provided after converting
+    them to strings.
     """
-    fields = ('nodes',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("nodes",)
+    nodes: t.List[Expr]
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> str:
         eval_ctx = get_eval_context(self, eval_ctx)
-        return ''.join(text_type(x.as_const(eval_ctx)) for x in self.nodes)
+        return "".join(str(x.as_const(eval_ctx)) for x in self.nodes)
 
 
 class Compare(Expr):
     """Compares an expression with some other expressions.  `ops` must be a
-    list of :class:`Operand`\s.
+    list of :class:`Operand`\\s.
     """
-    fields = ('expr', 'ops')
 
-    def as_const(self, eval_ctx=None):
+    fields = ("expr", "ops")
+    expr: Expr
+    ops: t.List["Operand"]
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         eval_ctx = get_eval_context(self, eval_ctx)
         result = value = self.expr.as_const(eval_ctx)
+
         try:
             for op in self.ops:
                 new_value = op.expr.as_const(eval_ctx)
                 result = _cmpop_to_func[op.op](value, new_value)
+
+                if not result:
+                    return False
+
                 value = new_value
-        except Exception:
-            raise Impossible()
+        except Exception as e:
+            raise Impossible() from e
+
         return result
 
 
 class Operand(Helper):
     """Holds an operator and an expression."""
-    fields = ('op', 'expr')
 
-if __debug__:
-    Operand.__doc__ += '\nThe following operators are available: ' + \
-        ', '.join(sorted('``%s``' % x for x in set(_binop_to_func) |
-                  set(_uaop_to_func) | set(_cmpop_to_func)))
+    fields = ("op", "expr")
+    op: str
+    expr: Expr
 
 
 class Mul(BinExpr):
     """Multiplies the left with the right node."""
-    operator = '*'
+
+    operator = "*"
 
 
 class Div(BinExpr):
     """Divides the left by the right node."""
-    operator = '/'
+
+    operator = "/"
 
 
 class FloorDiv(BinExpr):
-    """Divides the left by the right node and truncates conver the
+    """Divides the left by the right node and converts the
     result into an integer by truncating.
     """
-    operator = '//'
+
+    operator = "//"
 
 
 class Add(BinExpr):
     """Add the left to the right node."""
-    operator = '+'
+
+    operator = "+"
 
 
 class Sub(BinExpr):
-    """Substract the right from the left node."""
-    operator = '-'
+    """Subtract the right from the left node."""
+
+    operator = "-"
 
 
 class Mod(BinExpr):
     """Left modulo right."""
-    operator = '%'
+
+    operator = "%"
 
 
 class Pow(BinExpr):
     """Left to the power of right."""
-    operator = '**'
+
+    operator = "**"
 
 
 class And(BinExpr):
     """Short circuited AND."""
-    operator = 'and'
 
-    def as_const(self, eval_ctx=None):
+    operator = "and"
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         eval_ctx = get_eval_context(self, eval_ctx)
         return self.left.as_const(eval_ctx) and self.right.as_const(eval_ctx)
 
 
 class Or(BinExpr):
     """Short circuited OR."""
-    operator = 'or'
 
-    def as_const(self, eval_ctx=None):
+    operator = "or"
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> t.Any:
         eval_ctx = get_eval_context(self, eval_ctx)
         return self.left.as_const(eval_ctx) or self.right.as_const(eval_ctx)
 
 
 class Not(UnaryExpr):
     """Negate the expression."""
-    operator = 'not'
+
+    operator = "not"
 
 
 class Neg(UnaryExpr):
     """Make the expression negative."""
-    operator = '-'
+
+    operator = "-"
 
 
 class Pos(UnaryExpr):
     """Make the expression positive (noop for most expressions)"""
-    operator = '+'
+
+    operator = "+"
 
 
 # Helpers for extensions
@@ -800,7 +1031,9 @@
     """Loads an attribute from the environment object.  This is useful for
     extensions that want to call a callback stored on the environment.
     """
-    fields = ('name',)
+
+    fields = ("name",)
+    name: str
 
 
 class ExtensionAttribute(Expr):
@@ -810,7 +1043,10 @@
     This node is usually constructed by calling the
     :meth:`~jinja2.ext.Extension.attr` method on an extension.
     """
-    fields = ('identifier', 'name')
+
+    fields = ("identifier", "name")
+    identifier: str
+    name: str
 
 
 class ImportedName(Expr):
@@ -819,7 +1055,9 @@
     function from the cgi module on evaluation.  Imports are optimized by the
     compiler so there is no need to assign them to local variables.
     """
-    fields = ('importname',)
+
+    fields = ("importname",)
+    importname: str
 
 
 class InternalName(Expr):
@@ -827,20 +1065,26 @@
     yourself but the parser provides a
     :meth:`~jinja2.parser.Parser.free_identifier` method that creates
     a new identifier for you.  This identifier is not available from the
-    template and is not threated specially by the compiler.
+    template and is not treated specially by the compiler.
     """
-    fields = ('name',)
 
-    def __init__(self):
-        raise TypeError('Can\'t create internal names.  Use the '
-                        '`free_identifier` method on a parser.')
+    fields = ("name",)
+    name: str
+
+    def __init__(self) -> None:
+        raise TypeError(
+            "Can't create internal names.  Use the "
+            "`free_identifier` method on a parser."
+        )
 
 
 class MarkSafe(Expr):
     """Mark the wrapped expression as safe (wrap it as `Markup`)."""
-    fields = ('expr',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("expr",)
+    expr: Expr
+
+    def as_const(self, eval_ctx: t.Optional[EvalContext] = None) -> Markup:
         eval_ctx = get_eval_context(self, eval_ctx)
         return Markup(self.expr.as_const(eval_ctx))
 
@@ -851,9 +1095,13 @@
 
     .. versionadded:: 2.5
     """
-    fields = ('expr',)
 
-    def as_const(self, eval_ctx=None):
+    fields = ("expr",)
+    expr: Expr
+
+    def as_const(
+        self, eval_ctx: t.Optional[EvalContext] = None
+    ) -> t.Union[Markup, t.Any]:
         eval_ctx = get_eval_context(self, eval_ctx)
         if eval_ctx.volatile:
             raise Impossible()
@@ -873,6 +1121,20 @@
 
         Assign(Name('foo', ctx='store'),
                Getattr(ContextReference(), 'name'))
+
+    This is basically equivalent to using the
+    :func:`~jinja2.pass_context` decorator when using the high-level
+    API, which causes a reference to the context to be passed as the
+    first argument to a function.
+    """
+
+
+class DerivedContextReference(Expr):
+    """Return the current template context including locals. Behaves
+    exactly like :class:`ContextReference`, but includes local
+    variables, such as from a ``for`` loop.
+
+    .. versionadded:: 2.11
     """
 
 
@@ -886,7 +1148,28 @@
 
 class Scope(Stmt):
     """An artificial scope."""
-    fields = ('body',)
+
+    fields = ("body",)
+    body: t.List[Node]
+
+
+class OverlayScope(Stmt):
+    """An overlay scope for extensions.  This is a largely unoptimized scope
+    that however can be used to introduce completely arbitrary variables into
+    a sub scope from a dictionary or dictionary like object.  The `context`
+    field has to evaluate to a dictionary object.
+
+    Example usage::
+
+        OverlayScope(context=self.call_method('get_context'),
+                     body=[...])
+
+    .. versionadded:: 2.10
+    """
+
+    fields = ("context", "body")
+    context: Expr
+    body: t.List[Node]
 
 
 class EvalContextModifier(Stmt):
@@ -897,7 +1180,9 @@
 
         EvalContextModifier(options=[Keyword('autoescape', Const(True))])
     """
-    fields = ('options',)
+
+    fields = ("options",)
+    options: t.List[Keyword]
 
 
 class ScopedEvalContextModifier(EvalContextModifier):
@@ -905,10 +1190,15 @@
     :class:`EvalContextModifier` but will only modify the
     :class:`~jinja2.nodes.EvalContext` for nodes in the :attr:`body`.
     """
-    fields = ('body',)
+
+    fields = ("body",)
+    body: t.List[Node]
 
 
 # make sure nobody creates custom nodes
-def _failing_new(*args, **kwargs):
-    raise TypeError('can\'t create custom node types')
-NodeType.__new__ = staticmethod(_failing_new); del _failing_new
+def _failing_new(*args: t.Any, **kwargs: t.Any) -> "te.NoReturn":
+    raise TypeError("can't create custom node types")
+
+
+NodeType.__new__ = staticmethod(_failing_new)  # type: ignore
+del _failing_new

optimizer.py

diff --git a/optimizer.py b/optimizer.py
index 00eab11..fe10107 100644
--- a/optimizer.py
+++ b/optimizer.py
@@ -1,68 +1,47 @@
-# -*- coding: utf-8 -*-
+"""The optimizer tries to constant fold expressions and modify the AST
+in place so that it should be faster to evaluate.
+
+Because the AST does not contain all the scoping information and the
+compiler has to find that out, we cannot do all the optimizations we
+want. For example, loop unrolling doesn't work because unrolled loops
+would have a different scope. The solution would be a second syntax tree
+that stored the scoping rules.
 """
-    jinja2.optimizer
-    ~~~~~~~~~~~~~~~~
+import typing as t
 
-    The jinja optimizer is currently trying to constant fold a few expressions
-    and modify the AST in place so that it should be easier to evaluate it.
+from . import nodes
+from .visitor import NodeTransformer
 
-    Because the AST does not contain all the scoping information and the
-    compiler has to find that out, we cannot do all the optimizations we
-    want.  For example loop unrolling doesn't work because unrolled loops would
-    have a different scoping.
-
-    The solution would be a second syntax tree that has the scoping rules stored.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD.
-"""
-from jinja2 import nodes
-from jinja2.visitor import NodeTransformer
+if t.TYPE_CHECKING:
+    from .environment import Environment
 
 
-def optimize(node, environment):
+def optimize(node: nodes.Node, environment: "Environment") -> nodes.Node:
     """The context hint can be used to perform an static optimization
     based on the context given."""
     optimizer = Optimizer(environment)
-    return optimizer.visit(node)
+    return t.cast(nodes.Node, optimizer.visit(node))
 
 
 class Optimizer(NodeTransformer):
-
-    def __init__(self, environment):
+    def __init__(self, environment: "t.Optional[Environment]") -> None:
         self.environment = environment
 
-    def visit_If(self, node):
-        """Eliminate dead code."""
-        # do not optimize ifs that have a block inside so that it doesn't
-        # break super().
-        if node.find(nodes.Block) is not None:
-            return self.generic_visit(node)
-        try:
-            val = self.visit(node.test).as_const()
-        except nodes.Impossible:
-            return self.generic_visit(node)
-        if val:
-            body = node.body
-        else:
-            body = node.else_
-        result = []
-        for node in body:
-            result.extend(self.visit_list(node))
-        return result
+    def generic_visit(
+        self, node: nodes.Node, *args: t.Any, **kwargs: t.Any
+    ) -> nodes.Node:
+        node = super().generic_visit(node, *args, **kwargs)
 
-    def fold(self, node):
-        """Do constant folding."""
-        node = self.generic_visit(node)
-        try:
-            return nodes.Const.from_untrusted(node.as_const(),
-                                              lineno=node.lineno,
-                                              environment=self.environment)
-        except nodes.Impossible:
-            return node
+        # Do constant folding. Some other nodes besides Expr have
+        # as_const, but folding them causes errors later on.
+        if isinstance(node, nodes.Expr):
+            try:
+                return nodes.Const.from_untrusted(
+                    node.as_const(args[0] if args else None),
+                    lineno=node.lineno,
+                    environment=self.environment,
+                )
+            except nodes.Impossible:
+                pass
 
-    visit_Add = visit_Sub = visit_Mul = visit_Div = visit_FloorDiv = \
-    visit_Pow = visit_Mod = visit_And = visit_Or = visit_Pos = visit_Neg = \
-    visit_Not = visit_Compare = visit_Getitem = visit_Getattr = visit_Call = \
-    visit_Filter = visit_Test = visit_CondExpr = fold
-    del fold
+        return node

parser.py

diff --git a/parser.py b/parser.py
index f60cd01..cefce2d 100644
--- a/parser.py
+++ b/parser.py
@@ -1,47 +1,82 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.parser
-    ~~~~~~~~~~~~~
+"""Parse tokens from the lexer into nodes for the compiler."""
+import typing
+import typing as t
 
-    Implements the template parser.
+from . import nodes
+from .exceptions import TemplateAssertionError
+from .exceptions import TemplateSyntaxError
+from .lexer import describe_token
+from .lexer import describe_token_expr
 
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2 import nodes
-from jinja2.exceptions import TemplateSyntaxError, TemplateAssertionError
-from jinja2.lexer import describe_token, describe_token_expr
-from jinja2._compat import next, imap
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+    from .environment import Environment
+
+_ImportInclude = t.TypeVar("_ImportInclude", nodes.Import, nodes.Include)
+_MacroCall = t.TypeVar("_MacroCall", nodes.Macro, nodes.CallBlock)
+
+_statement_keywords = frozenset(
+    [
+        "for",
+        "if",
+        "block",
+        "extends",
+        "print",
+        "macro",
+        "include",
+        "from",
+        "import",
+        "set",
+        "with",
+        "autoescape",
+    ]
+)
+_compare_operators = frozenset(["eq", "ne", "lt", "lteq", "gt", "gteq"])
+
+_math_nodes: t.Dict[str, t.Type[nodes.Expr]] = {
+    "add": nodes.Add,
+    "sub": nodes.Sub,
+    "mul": nodes.Mul,
+    "div": nodes.Div,
+    "floordiv": nodes.FloorDiv,
+    "mod": nodes.Mod,
+}
 
 
-#: statements that callinto 
-_statement_keywords = frozenset(['for', 'if', 'block', 'extends', 'print',
-                                 'macro', 'include', 'from', 'import',
-                                 'set'])
-_compare_operators = frozenset(['eq', 'ne', 'lt', 'lteq', 'gt', 'gteq'])
-
-
-class Parser(object):
-    """This is the central parsing class Jinja2 uses.  It's passed to
+class Parser:
+    """This is the central parsing class Jinja uses.  It's passed to
     extensions and can be used to parse expressions or statements.
     """
 
-    def __init__(self, environment, source, name=None, filename=None,
-                 state=None):
+    def __init__(
+        self,
+        environment: "Environment",
+        source: str,
+        name: t.Optional[str] = None,
+        filename: t.Optional[str] = None,
+        state: t.Optional[str] = None,
+    ) -> None:
         self.environment = environment
         self.stream = environment._tokenize(source, name, filename, state)
         self.name = name
         self.filename = filename
         self.closed = False
-        self.extensions = {}
+        self.extensions: t.Dict[
+            str, t.Callable[["Parser"], t.Union[nodes.Node, t.List[nodes.Node]]]
+        ] = {}
         for extension in environment.iter_extensions():
             for tag in extension.tags:
                 self.extensions[tag] = extension.parse
         self._last_identifier = 0
-        self._tag_stack = []
-        self._end_token_stack = []
+        self._tag_stack: t.List[str] = []
+        self._end_token_stack: t.List[t.Tuple[str, ...]] = []
 
-    def fail(self, msg, lineno=None, exc=TemplateSyntaxError):
+    def fail(
+        self,
+        msg: str,
+        lineno: t.Optional[int] = None,
+        exc: t.Type[TemplateSyntaxError] = TemplateSyntaxError,
+    ) -> "te.NoReturn":
         """Convenience method that raises `exc` with the message, passed
         line number or last line number as well as the current name and
         filename.
@@ -50,79 +85,97 @@
             lineno = self.stream.current.lineno
         raise exc(msg, lineno, self.name, self.filename)
 
-    def _fail_ut_eof(self, name, end_token_stack, lineno):
-        expected = []
+    def _fail_ut_eof(
+        self,
+        name: t.Optional[str],
+        end_token_stack: t.List[t.Tuple[str, ...]],
+        lineno: t.Optional[int],
+    ) -> "te.NoReturn":
+        expected: t.Set[str] = set()
         for exprs in end_token_stack:
-            expected.extend(imap(describe_token_expr, exprs))
+            expected.update(map(describe_token_expr, exprs))
         if end_token_stack:
-            currently_looking = ' or '.join(
-                "'%s'" % describe_token_expr(expr)
-                for expr in end_token_stack[-1])
+            currently_looking: t.Optional[str] = " or ".join(
+                map(repr, map(describe_token_expr, end_token_stack[-1]))
+            )
         else:
             currently_looking = None
 
         if name is None:
-            message = ['Unexpected end of template.']
+            message = ["Unexpected end of template."]
         else:
-            message = ['Encountered unknown tag \'%s\'.' % name]
+            message = [f"Encountered unknown tag {name!r}."]
 
         if currently_looking:
             if name is not None and name in expected:
-                message.append('You probably made a nesting mistake. Jinja '
-                               'is expecting this tag, but currently looking '
-                               'for %s.' % currently_looking)
+                message.append(
+                    "You probably made a nesting mistake. Jinja is expecting this tag,"
+                    f" but currently looking for {currently_looking}."
+                )
             else:
-                message.append('Jinja was looking for the following tags: '
-                               '%s.' % currently_looking)
+                message.append(
+                    f"Jinja was looking for the following tags: {currently_looking}."
+                )
 
         if self._tag_stack:
-            message.append('The innermost block that needs to be '
-                           'closed is \'%s\'.' % self._tag_stack[-1])
+            message.append(
+                "The innermost block that needs to be closed is"
+                f" {self._tag_stack[-1]!r}."
+            )
 
-        self.fail(' '.join(message), lineno)
+        self.fail(" ".join(message), lineno)
 
-    def fail_unknown_tag(self, name, lineno=None):
+    def fail_unknown_tag(
+        self, name: str, lineno: t.Optional[int] = None
+    ) -> "te.NoReturn":
         """Called if the parser encounters an unknown tag.  Tries to fail
         with a human readable error message that could help to identify
         the problem.
         """
-        return self._fail_ut_eof(name, self._end_token_stack, lineno)
+        self._fail_ut_eof(name, self._end_token_stack, lineno)
 
-    def fail_eof(self, end_tokens=None, lineno=None):
+    def fail_eof(
+        self,
+        end_tokens: t.Optional[t.Tuple[str, ...]] = None,
+        lineno: t.Optional[int] = None,
+    ) -> "te.NoReturn":
         """Like fail_unknown_tag but for end of template situations."""
         stack = list(self._end_token_stack)
         if end_tokens is not None:
             stack.append(end_tokens)
-        return self._fail_ut_eof(None, stack, lineno)
+        self._fail_ut_eof(None, stack, lineno)
 
-    def is_tuple_end(self, extra_end_rules=None):
+    def is_tuple_end(
+        self, extra_end_rules: t.Optional[t.Tuple[str, ...]] = None
+    ) -> bool:
         """Are we at the end of a tuple?"""
-        if self.stream.current.type in ('variable_end', 'block_end', 'rparen'):
+        if self.stream.current.type in ("variable_end", "block_end", "rparen"):
             return True
         elif extra_end_rules is not None:
-            return self.stream.current.test_any(extra_end_rules)
+            return self.stream.current.test_any(extra_end_rules)  # type: ignore
         return False
 
-    def free_identifier(self, lineno=None):
+    def free_identifier(self, lineno: t.Optional[int] = None) -> nodes.InternalName:
         """Return a new free identifier as :class:`~jinja2.nodes.InternalName`."""
         self._last_identifier += 1
         rv = object.__new__(nodes.InternalName)
-        nodes.Node.__init__(rv, 'fi%d' % self._last_identifier, lineno=lineno)
+        nodes.Node.__init__(rv, f"fi{self._last_identifier}", lineno=lineno)
         return rv
 
-    def parse_statement(self):
+    def parse_statement(self) -> t.Union[nodes.Node, t.List[nodes.Node]]:
         """Parse a single statement."""
         token = self.stream.current
-        if token.type != 'name':
-            self.fail('tag name expected', token.lineno)
+        if token.type != "name":
+            self.fail("tag name expected", token.lineno)
         self._tag_stack.append(token.value)
         pop_tag = True
         try:
             if token.value in _statement_keywords:
-                return getattr(self, 'parse_' + self.stream.current.value)()
-            if token.value == 'call':
+                f = getattr(self, f"parse_{self.stream.current.value}")
+                return f()  # type: ignore
+            if token.value == "call":
                 return self.parse_call_block()
-            if token.value == 'filter':
+            if token.value == "filter":
                 return self.parse_filter_block()
             ext = self.extensions.get(token.value)
             if ext is not None:
@@ -138,7 +191,9 @@
             if pop_tag:
                 self._tag_stack.pop()
 
-    def parse_statements(self, end_tokens, drop_needle=False):
+    def parse_statements(
+        self, end_tokens: t.Tuple[str, ...], drop_needle: bool = False
+    ) -> t.List[nodes.Node]:
         """Parse multiple statements into a list until one of the end tokens
         is reached.  This is used to parse the body of statements as it also
         parses template data if appropriate.  The parser checks first if the
@@ -149,235 +204,313 @@
         can be set to `True` and the end token is removed.
         """
         # the first token may be a colon for python compatibility
-        self.stream.skip_if('colon')
+        self.stream.skip_if("colon")
 
         # in the future it would be possible to add whole code sections
         # by adding some sort of end of statement token and parsing those here.
-        self.stream.expect('block_end')
+        self.stream.expect("block_end")
         result = self.subparse(end_tokens)
 
         # we reached the end of the template too early, the subparser
         # does not check for this, so we do that now
-        if self.stream.current.type == 'eof':
+        if self.stream.current.type == "eof":
             self.fail_eof(end_tokens)
 
         if drop_needle:
             next(self.stream)
         return result
 
-    def parse_set(self):
+    def parse_set(self) -> t.Union[nodes.Assign, nodes.AssignBlock]:
         """Parse an assign statement."""
         lineno = next(self.stream).lineno
-        target = self.parse_assign_target()
-        self.stream.expect('assign')
-        expr = self.parse_tuple()
-        return nodes.Assign(target, expr, lineno=lineno)
+        target = self.parse_assign_target(with_namespace=True)
+        if self.stream.skip_if("assign"):
+            expr = self.parse_tuple()
+            return nodes.Assign(target, expr, lineno=lineno)
+        filter_node = self.parse_filter(None)
+        body = self.parse_statements(("name:endset",), drop_needle=True)
+        return nodes.AssignBlock(target, filter_node, body, lineno=lineno)
 
-    def parse_for(self):
+    def parse_for(self) -> nodes.For:
         """Parse a for loop."""
-        lineno = self.stream.expect('name:for').lineno
-        target = self.parse_assign_target(extra_end_rules=('name:in',))
-        self.stream.expect('name:in')
-        iter = self.parse_tuple(with_condexpr=False,
-                                extra_end_rules=('name:recursive',))
+        lineno = self.stream.expect("name:for").lineno
+        target = self.parse_assign_target(extra_end_rules=("name:in",))
+        self.stream.expect("name:in")
+        iter = self.parse_tuple(
+            with_condexpr=False, extra_end_rules=("name:recursive",)
+        )
         test = None
-        if self.stream.skip_if('name:if'):
+        if self.stream.skip_if("name:if"):
             test = self.parse_expression()
-        recursive = self.stream.skip_if('name:recursive')
-        body = self.parse_statements(('name:endfor', 'name:else'))
-        if next(self.stream).value == 'endfor':
+        recursive = self.stream.skip_if("name:recursive")
+        body = self.parse_statements(("name:endfor", "name:else"))
+        if next(self.stream).value == "endfor":
             else_ = []
         else:
-            else_ = self.parse_statements(('name:endfor',), drop_needle=True)
-        return nodes.For(target, iter, body, else_, test,
-                         recursive, lineno=lineno)
+            else_ = self.parse_statements(("name:endfor",), drop_needle=True)
+        return nodes.For(target, iter, body, else_, test, recursive, lineno=lineno)
 
-    def parse_if(self):
+    def parse_if(self) -> nodes.If:
         """Parse an if construct."""
-        node = result = nodes.If(lineno=self.stream.expect('name:if').lineno)
-        while 1:
+        node = result = nodes.If(lineno=self.stream.expect("name:if").lineno)
+        while True:
             node.test = self.parse_tuple(with_condexpr=False)
-            node.body = self.parse_statements(('name:elif', 'name:else',
-                                               'name:endif'))
+            node.body = self.parse_statements(("name:elif", "name:else", "name:endif"))
+            node.elif_ = []
+            node.else_ = []
             token = next(self.stream)
-            if token.test('name:elif'):
-                new_node = nodes.If(lineno=self.stream.current.lineno)
-                node.else_ = [new_node]
-                node = new_node
+            if token.test("name:elif"):
+                node = nodes.If(lineno=self.stream.current.lineno)
+                result.elif_.append(node)
                 continue
-            elif token.test('name:else'):
-                node.else_ = self.parse_statements(('name:endif',),
-                                                   drop_needle=True)
-            else:
-                node.else_ = []
+            elif token.test("name:else"):
+                result.else_ = self.parse_statements(("name:endif",), drop_needle=True)
             break
         return result
 
-    def parse_block(self):
+    def parse_with(self) -> nodes.With:
+        node = nodes.With(lineno=next(self.stream).lineno)
+        targets: t.List[nodes.Expr] = []
+        values: t.List[nodes.Expr] = []
+        while self.stream.current.type != "block_end":
+            if targets:
+                self.stream.expect("comma")
+            target = self.parse_assign_target()
+            target.set_ctx("param")
+            targets.append(target)
+            self.stream.expect("assign")
+            values.append(self.parse_expression())
+        node.targets = targets
+        node.values = values
+        node.body = self.parse_statements(("name:endwith",), drop_needle=True)
+        return node
+
+    def parse_autoescape(self) -> nodes.Scope:
+        node = nodes.ScopedEvalContextModifier(lineno=next(self.stream).lineno)
+        node.options = [nodes.Keyword("autoescape", self.parse_expression())]
+        node.body = self.parse_statements(("name:endautoescape",), drop_needle=True)
+        return nodes.Scope([node])
+
+    def parse_block(self) -> nodes.Block:
         node = nodes.Block(lineno=next(self.stream).lineno)
-        node.name = self.stream.expect('name').value
-        node.scoped = self.stream.skip_if('name:scoped')
+        node.name = self.stream.expect("name").value
+        node.scoped = self.stream.skip_if("name:scoped")
+        node.required = self.stream.skip_if("name:required")
 
         # common problem people encounter when switching from django
         # to jinja.  we do not support hyphens in block names, so let's
         # raise a nicer error message in that case.
-        if self.stream.current.type == 'sub':
-            self.fail('Block names in Jinja have to be valid Python '
-                      'identifiers and may not contain hyphens, use an '
-                      'underscore instead.')
+        if self.stream.current.type == "sub":
+            self.fail(
+                "Block names in Jinja have to be valid Python identifiers and may not"
+                " contain hyphens, use an underscore instead."
+            )
 
-        node.body = self.parse_statements(('name:endblock',), drop_needle=True)
-        self.stream.skip_if('name:' + node.name)
+        node.body = self.parse_statements(("name:endblock",), drop_needle=True)
+
+        # enforce that required blocks only contain whitespace or comments
+        # by asserting that the body, if not empty, is just TemplateData nodes
+        # with whitespace data
+        if node.required and not all(
+            isinstance(child, nodes.TemplateData) and child.data.isspace()
+            for body in node.body
+            for child in body.nodes  # type: ignore
+        ):
+            self.fail("Required blocks can only contain comments or whitespace")
+
+        self.stream.skip_if("name:" + node.name)
         return node
 
-    def parse_extends(self):
+    def parse_extends(self) -> nodes.Extends:
         node = nodes.Extends(lineno=next(self.stream).lineno)
         node.template = self.parse_expression()
         return node
 
-    def parse_import_context(self, node, default):
-        if self.stream.current.test_any('name:with', 'name:without') and \
-           self.stream.look().test('name:context'):
-            node.with_context = next(self.stream).value == 'with'
+    def parse_import_context(
+        self, node: _ImportInclude, default: bool
+    ) -> _ImportInclude:
+        if self.stream.current.test_any(
+            "name:with", "name:without"
+        ) and self.stream.look().test("name:context"):
+            node.with_context = next(self.stream).value == "with"
             self.stream.skip()
         else:
             node.with_context = default
         return node
 
-    def parse_include(self):
+    def parse_include(self) -> nodes.Include:
         node = nodes.Include(lineno=next(self.stream).lineno)
         node.template = self.parse_expression()
-        if self.stream.current.test('name:ignore') and \
-           self.stream.look().test('name:missing'):
+        if self.stream.current.test("name:ignore") and self.stream.look().test(
+            "name:missing"
+        ):
             node.ignore_missing = True
             self.stream.skip(2)
         else:
             node.ignore_missing = False
         return self.parse_import_context(node, True)
 
-    def parse_import(self):
+    def parse_import(self) -> nodes.Import:
         node = nodes.Import(lineno=next(self.stream).lineno)
         node.template = self.parse_expression()
-        self.stream.expect('name:as')
+        self.stream.expect("name:as")
         node.target = self.parse_assign_target(name_only=True).name
         return self.parse_import_context(node, False)
 
-    def parse_from(self):
+    def parse_from(self) -> nodes.FromImport:
         node = nodes.FromImport(lineno=next(self.stream).lineno)
         node.template = self.parse_expression()
-        self.stream.expect('name:import')
+        self.stream.expect("name:import")
         node.names = []
 
-        def parse_context():
-            if self.stream.current.value in ('with', 'without') and \
-               self.stream.look().test('name:context'):
-                node.with_context = next(self.stream).value == 'with'
+        def parse_context() -> bool:
+            if self.stream.current.value in {
+                "with",
+                "without",
+            } and self.stream.look().test("name:context"):
+                node.with_context = next(self.stream).value == "with"
                 self.stream.skip()
                 return True
             return False
 
-        while 1:
+        while True:
             if node.names:
-                self.stream.expect('comma')
-            if self.stream.current.type == 'name':
+                self.stream.expect("comma")
+            if self.stream.current.type == "name":
                 if parse_context():
                     break
                 target = self.parse_assign_target(name_only=True)
-                if target.name.startswith('_'):
-                    self.fail('names starting with an underline can not '
-                              'be imported', target.lineno,
-                              exc=TemplateAssertionError)
-                if self.stream.skip_if('name:as'):
+                if target.name.startswith("_"):
+                    self.fail(
+                        "names starting with an underline can not be imported",
+                        target.lineno,
+                        exc=TemplateAssertionError,
+                    )
+                if self.stream.skip_if("name:as"):
                     alias = self.parse_assign_target(name_only=True)
                     node.names.append((target.name, alias.name))
                 else:
                     node.names.append(target.name)
-                if parse_context() or self.stream.current.type != 'comma':
+                if parse_context() or self.stream.current.type != "comma":
                     break
             else:
-                break
-        if not hasattr(node, 'with_context'):
+                self.stream.expect("name")
+        if not hasattr(node, "with_context"):
             node.with_context = False
-            self.stream.skip_if('comma')
         return node
 
-    def parse_signature(self, node):
-        node.args = args = []
-        node.defaults = defaults = []
-        self.stream.expect('lparen')
-        while self.stream.current.type != 'rparen':
+    def parse_signature(self, node: _MacroCall) -> None:
+        args = node.args = []
+        defaults = node.defaults = []
+        self.stream.expect("lparen")
+        while self.stream.current.type != "rparen":
             if args:
-                self.stream.expect('comma')
+                self.stream.expect("comma")
             arg = self.parse_assign_target(name_only=True)
-            arg.set_ctx('param')
-            if self.stream.skip_if('assign'):
+            arg.set_ctx("param")
+            if self.stream.skip_if("assign"):
                 defaults.append(self.parse_expression())
+            elif defaults:
+                self.fail("non-default argument follows default argument")
             args.append(arg)
-        self.stream.expect('rparen')
+        self.stream.expect("rparen")
 
-    def parse_call_block(self):
+    def parse_call_block(self) -> nodes.CallBlock:
         node = nodes.CallBlock(lineno=next(self.stream).lineno)
-        if self.stream.current.type == 'lparen':
+        if self.stream.current.type == "lparen":
             self.parse_signature(node)
         else:
             node.args = []
             node.defaults = []
 
-        node.call = self.parse_expression()
-        if not isinstance(node.call, nodes.Call):
-            self.fail('expected call', node.lineno)
-        node.body = self.parse_statements(('name:endcall',), drop_needle=True)
+        call_node = self.parse_expression()
+        if not isinstance(call_node, nodes.Call):
+            self.fail("expected call", node.lineno)
+        node.call = call_node
+        node.body = self.parse_statements(("name:endcall",), drop_needle=True)
         return node
 
-    def parse_filter_block(self):
+    def parse_filter_block(self) -> nodes.FilterBlock:
         node = nodes.FilterBlock(lineno=next(self.stream).lineno)
-        node.filter = self.parse_filter(None, start_inline=True)
-        node.body = self.parse_statements(('name:endfilter',),
-                                          drop_needle=True)
+        node.filter = self.parse_filter(None, start_inline=True)  # type: ignore
+        node.body = self.parse_statements(("name:endfilter",), drop_needle=True)
         return node
 
-    def parse_macro(self):
+    def parse_macro(self) -> nodes.Macro:
         node = nodes.Macro(lineno=next(self.stream).lineno)
         node.name = self.parse_assign_target(name_only=True).name
         self.parse_signature(node)
-        node.body = self.parse_statements(('name:endmacro',),
-                                          drop_needle=True)
+        node.body = self.parse_statements(("name:endmacro",), drop_needle=True)
         return node
 
-    def parse_print(self):
+    def parse_print(self) -> nodes.Output:
         node = nodes.Output(lineno=next(self.stream).lineno)
         node.nodes = []
-        while self.stream.current.type != 'block_end':
+        while self.stream.current.type != "block_end":
             if node.nodes:
-                self.stream.expect('comma')
+                self.stream.expect("comma")
             node.nodes.append(self.parse_expression())
         return node
 
-    def parse_assign_target(self, with_tuple=True, name_only=False,
-                            extra_end_rules=None):
-        """Parse an assignment target.  As Jinja2 allows assignments to
+    @typing.overload
+    def parse_assign_target(
+        self, with_tuple: bool = ..., name_only: "te.Literal[True]" = ...
+    ) -> nodes.Name:
+        ...
+
+    @typing.overload
+    def parse_assign_target(
+        self,
+        with_tuple: bool = True,
+        name_only: bool = False,
+        extra_end_rules: t.Optional[t.Tuple[str, ...]] = None,
+        with_namespace: bool = False,
+    ) -> t.Union[nodes.NSRef, nodes.Name, nodes.Tuple]:
+        ...
+
+    def parse_assign_target(
+        self,
+        with_tuple: bool = True,
+        name_only: bool = False,
+        extra_end_rules: t.Optional[t.Tuple[str, ...]] = None,
+        with_namespace: bool = False,
+    ) -> t.Union[nodes.NSRef, nodes.Name, nodes.Tuple]:
+        """Parse an assignment target.  As Jinja allows assignments to
         tuples, this function can parse all allowed assignment targets.  Per
         default assignments to tuples are parsed, that can be disable however
         by setting `with_tuple` to `False`.  If only assignments to names are
         wanted `name_only` can be set to `True`.  The `extra_end_rules`
-        parameter is forwarded to the tuple parsing function.
+        parameter is forwarded to the tuple parsing function.  If
+        `with_namespace` is enabled, a namespace assignment may be parsed.
         """
-        if name_only:
-            token = self.stream.expect('name')
-            target = nodes.Name(token.value, 'store', lineno=token.lineno)
+        target: nodes.Expr
+
+        if with_namespace and self.stream.look().type == "dot":
+            token = self.stream.expect("name")
+            next(self.stream)  # dot
+            attr = self.stream.expect("name")
+            target = nodes.NSRef(token.value, attr.value, lineno=token.lineno)
+        elif name_only:
+            token = self.stream.expect("name")
+            target = nodes.Name(token.value, "store", lineno=token.lineno)
         else:
             if with_tuple:
-                target = self.parse_tuple(simplified=True,
-                                          extra_end_rules=extra_end_rules)
+                target = self.parse_tuple(
+                    simplified=True, extra_end_rules=extra_end_rules
+                )
             else:
                 target = self.parse_primary()
-            target.set_ctx('store')
-        if not target.can_assign():
-            self.fail('can\'t assign to %r' % target.__class__.
-                      __name__.lower(), target.lineno)
-        return target
 
-    def parse_expression(self, with_condexpr=True):
+            target.set_ctx("store")
+
+        if not target.can_assign():
+            self.fail(
+                f"can't assign to {type(target).__name__.lower()!r}", target.lineno
+            )
+
+        return target  # type: ignore
+
+    def parse_expression(self, with_condexpr: bool = True) -> nodes.Expr:
         """Parse an expression.  Per default all expressions are parsed, if
         the optional `with_condexpr` parameter is set to `False` conditional
         expressions are not parsed.
@@ -386,12 +519,14 @@
             return self.parse_condexpr()
         return self.parse_or()
 
-    def parse_condexpr(self):
+    def parse_condexpr(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
         expr1 = self.parse_or()
-        while self.stream.skip_if('name:if'):
+        expr3: t.Optional[nodes.Expr]
+
+        while self.stream.skip_if("name:if"):
             expr2 = self.parse_or()
-            if self.stream.skip_if('name:else'):
+            if self.stream.skip_if("name:else"):
                 expr3 = self.parse_condexpr()
             else:
                 expr3 = None
@@ -399,45 +534,46 @@
             lineno = self.stream.current.lineno
         return expr1
 
-    def parse_or(self):
+    def parse_or(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
         left = self.parse_and()
-        while self.stream.skip_if('name:or'):
+        while self.stream.skip_if("name:or"):
             right = self.parse_and()
             left = nodes.Or(left, right, lineno=lineno)
             lineno = self.stream.current.lineno
         return left
 
-    def parse_and(self):
+    def parse_and(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
         left = self.parse_not()
-        while self.stream.skip_if('name:and'):
+        while self.stream.skip_if("name:and"):
             right = self.parse_not()
             left = nodes.And(left, right, lineno=lineno)
             lineno = self.stream.current.lineno
         return left
 
-    def parse_not(self):
-        if self.stream.current.test('name:not'):
+    def parse_not(self) -> nodes.Expr:
+        if self.stream.current.test("name:not"):
             lineno = next(self.stream).lineno
             return nodes.Not(self.parse_not(), lineno=lineno)
         return self.parse_compare()
 
-    def parse_compare(self):
+    def parse_compare(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
-        expr = self.parse_add()
+        expr = self.parse_math1()
         ops = []
-        while 1:
+        while True:
             token_type = self.stream.current.type
             if token_type in _compare_operators:
                 next(self.stream)
-                ops.append(nodes.Operand(token_type, self.parse_add()))
-            elif self.stream.skip_if('name:in'):
-                ops.append(nodes.Operand('in', self.parse_add()))
-            elif self.stream.current.test('name:not') and \
-                 self.stream.look().test('name:in'):
+                ops.append(nodes.Operand(token_type, self.parse_math1()))
+            elif self.stream.skip_if("name:in"):
+                ops.append(nodes.Operand("in", self.parse_math1()))
+            elif self.stream.current.test("name:not") and self.stream.look().test(
+                "name:in"
+            ):
                 self.stream.skip(2)
-                ops.append(nodes.Operand('notin', self.parse_add()))
+                ops.append(nodes.Operand("notin", self.parse_math1()))
             else:
                 break
             lineno = self.stream.current.lineno
@@ -445,93 +581,57 @@
             return expr
         return nodes.Compare(expr, ops, lineno=lineno)
 
-    def parse_add(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_sub()
-        while self.stream.current.type == 'add':
-            next(self.stream)
-            right = self.parse_sub()
-            left = nodes.Add(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_sub(self):
+    def parse_math1(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
         left = self.parse_concat()
-        while self.stream.current.type == 'sub':
+        while self.stream.current.type in ("add", "sub"):
+            cls = _math_nodes[self.stream.current.type]
             next(self.stream)
             right = self.parse_concat()
-            left = nodes.Sub(left, right, lineno=lineno)
+            left = cls(left, right, lineno=lineno)
             lineno = self.stream.current.lineno
         return left
 
-    def parse_concat(self):
+    def parse_concat(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
-        args = [self.parse_mul()]
-        while self.stream.current.type == 'tilde':
+        args = [self.parse_math2()]
+        while self.stream.current.type == "tilde":
             next(self.stream)
-            args.append(self.parse_mul())
+            args.append(self.parse_math2())
         if len(args) == 1:
             return args[0]
         return nodes.Concat(args, lineno=lineno)
 
-    def parse_mul(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_div()
-        while self.stream.current.type == 'mul':
-            next(self.stream)
-            right = self.parse_div()
-            left = nodes.Mul(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_div(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_floordiv()
-        while self.stream.current.type == 'div':
-            next(self.stream)
-            right = self.parse_floordiv()
-            left = nodes.Div(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_floordiv(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_mod()
-        while self.stream.current.type == 'floordiv':
-            next(self.stream)
-            right = self.parse_mod()
-            left = nodes.FloorDiv(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_mod(self):
+    def parse_math2(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
         left = self.parse_pow()
-        while self.stream.current.type == 'mod':
+        while self.stream.current.type in ("mul", "div", "floordiv", "mod"):
+            cls = _math_nodes[self.stream.current.type]
             next(self.stream)
             right = self.parse_pow()
-            left = nodes.Mod(left, right, lineno=lineno)
+            left = cls(left, right, lineno=lineno)
             lineno = self.stream.current.lineno
         return left
 
-    def parse_pow(self):
+    def parse_pow(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
         left = self.parse_unary()
-        while self.stream.current.type == 'pow':
+        while self.stream.current.type == "pow":
             next(self.stream)
             right = self.parse_unary()
             left = nodes.Pow(left, right, lineno=lineno)
             lineno = self.stream.current.lineno
         return left
 
-    def parse_unary(self, with_filter=True):
+    def parse_unary(self, with_filter: bool = True) -> nodes.Expr:
         token_type = self.stream.current.type
         lineno = self.stream.current.lineno
-        if token_type == 'sub':
+        node: nodes.Expr
+
+        if token_type == "sub":
             next(self.stream)
             node = nodes.Neg(self.parse_unary(False), lineno=lineno)
-        elif token_type == 'add':
+        elif token_type == "add":
             next(self.stream)
             node = nodes.Pos(self.parse_unary(False), lineno=lineno)
         else:
@@ -541,42 +641,47 @@
             node = self.parse_filter_expr(node)
         return node
 
-    def parse_primary(self):
+    def parse_primary(self) -> nodes.Expr:
         token = self.stream.current
-        if token.type == 'name':
-            if token.value in ('true', 'false', 'True', 'False'):
-                node = nodes.Const(token.value in ('true', 'True'),
-                                   lineno=token.lineno)
-            elif token.value in ('none', 'None'):
+        node: nodes.Expr
+        if token.type == "name":
+            if token.value in ("true", "false", "True", "False"):
+                node = nodes.Const(token.value in ("true", "True"), lineno=token.lineno)
+            elif token.value in ("none", "None"):
                 node = nodes.Const(None, lineno=token.lineno)
             else:
-                node = nodes.Name(token.value, 'load', lineno=token.lineno)
+                node = nodes.Name(token.value, "load", lineno=token.lineno)
             next(self.stream)
-        elif token.type == 'string':
+        elif token.type == "string":
             next(self.stream)
             buf = [token.value]
             lineno = token.lineno
-            while self.stream.current.type == 'string':
+            while self.stream.current.type == "string":
                 buf.append(self.stream.current.value)
                 next(self.stream)
-            node = nodes.Const(''.join(buf), lineno=lineno)
-        elif token.type in ('integer', 'float'):
+            node = nodes.Const("".join(buf), lineno=lineno)
+        elif token.type in ("integer", "float"):
             next(self.stream)
             node = nodes.Const(token.value, lineno=token.lineno)
-        elif token.type == 'lparen':
+        elif token.type == "lparen":
             next(self.stream)
             node = self.parse_tuple(explicit_parentheses=True)
-            self.stream.expect('rparen')
-        elif token.type == 'lbracket':
+            self.stream.expect("rparen")
+        elif token.type == "lbracket":
             node = self.parse_list()
-        elif token.type == 'lbrace':
+        elif token.type == "lbrace":
             node = self.parse_dict()
         else:
-            self.fail("unexpected '%s'" % describe_token(token), token.lineno)
+            self.fail(f"unexpected {describe_token(token)!r}", token.lineno)
         return node
 
-    def parse_tuple(self, simplified=False, with_condexpr=True,
-                    extra_end_rules=None, explicit_parentheses=False):
+    def parse_tuple(
+        self,
+        simplified: bool = False,
+        with_condexpr: bool = True,
+        extra_end_rules: t.Optional[t.Tuple[str, ...]] = None,
+        explicit_parentheses: bool = False,
+    ) -> t.Union[nodes.Tuple, nodes.Expr]:
         """Works like `parse_expression` but if multiple expressions are
         delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
         This method could also return a regular expression instead of a tuple
@@ -601,16 +706,20 @@
         elif with_condexpr:
             parse = self.parse_expression
         else:
-            parse = lambda: self.parse_expression(with_condexpr=False)
-        args = []
+
+            def parse() -> nodes.Expr:
+                return self.parse_expression(with_condexpr=False)
+
+        args: t.List[nodes.Expr] = []
         is_tuple = False
-        while 1:
+
+        while True:
             if args:
-                self.stream.expect('comma')
+                self.stream.expect("comma")
             if self.is_tuple_end(extra_end_rules):
                 break
             args.append(parse())
-            if self.stream.current.type == 'comma':
+            if self.stream.current.type == "comma":
                 is_tuple = True
             else:
                 break
@@ -625,115 +734,123 @@
             # nothing) in the spot of an expression would be an empty
             # tuple.
             if not explicit_parentheses:
-                self.fail('Expected an expression, got \'%s\'' %
-                          describe_token(self.stream.current))
+                self.fail(
+                    "Expected an expression,"
+                    f" got {describe_token(self.stream.current)!r}"
+                )
 
-        return nodes.Tuple(args, 'load', lineno=lineno)
+        return nodes.Tuple(args, "load", lineno=lineno)
 
-    def parse_list(self):
-        token = self.stream.expect('lbracket')
-        items = []
-        while self.stream.current.type != 'rbracket':
+    def parse_list(self) -> nodes.List:
+        token = self.stream.expect("lbracket")
+        items: t.List[nodes.Expr] = []
+        while self.stream.current.type != "rbracket":
             if items:
-                self.stream.expect('comma')
-            if self.stream.current.type == 'rbracket':
+                self.stream.expect("comma")
+            if self.stream.current.type == "rbracket":
                 break
             items.append(self.parse_expression())
-        self.stream.expect('rbracket')
+        self.stream.expect("rbracket")
         return nodes.List(items, lineno=token.lineno)
 
-    def parse_dict(self):
-        token = self.stream.expect('lbrace')
-        items = []
-        while self.stream.current.type != 'rbrace':
+    def parse_dict(self) -> nodes.Dict:
+        token = self.stream.expect("lbrace")
+        items: t.List[nodes.Pair] = []
+        while self.stream.current.type != "rbrace":
             if items:
-                self.stream.expect('comma')
-            if self.stream.current.type == 'rbrace':
+                self.stream.expect("comma")
+            if self.stream.current.type == "rbrace":
                 break
             key = self.parse_expression()
-            self.stream.expect('colon')
+            self.stream.expect("colon")
             value = self.parse_expression()
             items.append(nodes.Pair(key, value, lineno=key.lineno))
-        self.stream.expect('rbrace')
+        self.stream.expect("rbrace")
         return nodes.Dict(items, lineno=token.lineno)
 
-    def parse_postfix(self, node):
-        while 1:
+    def parse_postfix(self, node: nodes.Expr) -> nodes.Expr:
+        while True:
             token_type = self.stream.current.type
-            if token_type == 'dot' or token_type == 'lbracket':
+            if token_type == "dot" or token_type == "lbracket":
                 node = self.parse_subscript(node)
             # calls are valid both after postfix expressions (getattr
             # and getitem) as well as filters and tests
-            elif token_type == 'lparen':
+            elif token_type == "lparen":
                 node = self.parse_call(node)
             else:
                 break
         return node
 
-    def parse_filter_expr(self, node):
-        while 1:
+    def parse_filter_expr(self, node: nodes.Expr) -> nodes.Expr:
+        while True:
             token_type = self.stream.current.type
-            if token_type == 'pipe':
-                node = self.parse_filter(node)
-            elif token_type == 'name' and self.stream.current.value == 'is':
+            if token_type == "pipe":
+                node = self.parse_filter(node)  # type: ignore
+            elif token_type == "name" and self.stream.current.value == "is":
                 node = self.parse_test(node)
             # calls are valid both after postfix expressions (getattr
             # and getitem) as well as filters and tests
-            elif token_type == 'lparen':
+            elif token_type == "lparen":
                 node = self.parse_call(node)
             else:
                 break
         return node
 
-    def parse_subscript(self, node):
+    def parse_subscript(
+        self, node: nodes.Expr
+    ) -> t.Union[nodes.Getattr, nodes.Getitem]:
         token = next(self.stream)
-        if token.type == 'dot':
+        arg: nodes.Expr
+
+        if token.type == "dot":
             attr_token = self.stream.current
             next(self.stream)
-            if attr_token.type == 'name':
-                return nodes.Getattr(node, attr_token.value, 'load',
-                                     lineno=token.lineno)
-            elif attr_token.type != 'integer':
-                self.fail('expected name or number', attr_token.lineno)
+            if attr_token.type == "name":
+                return nodes.Getattr(
+                    node, attr_token.value, "load", lineno=token.lineno
+                )
+            elif attr_token.type != "integer":
+                self.fail("expected name or number", attr_token.lineno)
             arg = nodes.Const(attr_token.value, lineno=attr_token.lineno)
-            return nodes.Getitem(node, arg, 'load', lineno=token.lineno)
-        if token.type == 'lbracket':
-            args = []
-            while self.stream.current.type != 'rbracket':
+            return nodes.Getitem(node, arg, "load", lineno=token.lineno)
+        if token.type == "lbracket":
+            args: t.List[nodes.Expr] = []
+            while self.stream.current.type != "rbracket":
                 if args:
-                    self.stream.expect('comma')
+                    self.stream.expect("comma")
                 args.append(self.parse_subscribed())
-            self.stream.expect('rbracket')
+            self.stream.expect("rbracket")
             if len(args) == 1:
                 arg = args[0]
             else:
-                arg = nodes.Tuple(args, 'load', lineno=token.lineno)
-            return nodes.Getitem(node, arg, 'load', lineno=token.lineno)
-        self.fail('expected subscript expression', self.lineno)
+                arg = nodes.Tuple(args, "load", lineno=token.lineno)
+            return nodes.Getitem(node, arg, "load", lineno=token.lineno)
+        self.fail("expected subscript expression", token.lineno)
 
-    def parse_subscribed(self):
+    def parse_subscribed(self) -> nodes.Expr:
         lineno = self.stream.current.lineno
+        args: t.List[t.Optional[nodes.Expr]]
 
-        if self.stream.current.type == 'colon':
+        if self.stream.current.type == "colon":
             next(self.stream)
             args = [None]
         else:
             node = self.parse_expression()
-            if self.stream.current.type != 'colon':
+            if self.stream.current.type != "colon":
                 return node
             next(self.stream)
             args = [node]
 
-        if self.stream.current.type == 'colon':
+        if self.stream.current.type == "colon":
             args.append(None)
-        elif self.stream.current.type not in ('rbracket', 'comma'):
+        elif self.stream.current.type not in ("rbracket", "comma"):
             args.append(self.parse_expression())
         else:
             args.append(None)
 
-        if self.stream.current.type == 'colon':
+        if self.stream.current.type == "colon":
             next(self.stream)
-            if self.stream.current.type not in ('rbracket', 'comma'):
+            if self.stream.current.type not in ("rbracket", "comma"):
                 args.append(self.parse_expression())
             else:
                 args.append(None)
@@ -742,113 +859,134 @@
 
         return nodes.Slice(lineno=lineno, *args)
 
-    def parse_call(self, node):
-        token = self.stream.expect('lparen')
+    def parse_call_args(self) -> t.Tuple:
+        token = self.stream.expect("lparen")
         args = []
         kwargs = []
-        dyn_args = dyn_kwargs = None
+        dyn_args = None
+        dyn_kwargs = None
         require_comma = False
 
-        def ensure(expr):
+        def ensure(expr: bool) -> None:
             if not expr:
-                self.fail('invalid syntax for function call expression',
-                          token.lineno)
+                self.fail("invalid syntax for function call expression", token.lineno)
 
-        while self.stream.current.type != 'rparen':
+        while self.stream.current.type != "rparen":
             if require_comma:
-                self.stream.expect('comma')
+                self.stream.expect("comma")
+
                 # support for trailing comma
-                if self.stream.current.type == 'rparen':
+                if self.stream.current.type == "rparen":
                     break
-            if self.stream.current.type == 'mul':
+
+            if self.stream.current.type == "mul":
                 ensure(dyn_args is None and dyn_kwargs is None)
                 next(self.stream)
                 dyn_args = self.parse_expression()
-            elif self.stream.current.type == 'pow':
+            elif self.stream.current.type == "pow":
                 ensure(dyn_kwargs is None)
                 next(self.stream)
                 dyn_kwargs = self.parse_expression()
             else:
-                ensure(dyn_args is None and dyn_kwargs is None)
-                if self.stream.current.type == 'name' and \
-                    self.stream.look().type == 'assign':
+                if (
+                    self.stream.current.type == "name"
+                    and self.stream.look().type == "assign"
+                ):
+                    # Parsing a kwarg
+                    ensure(dyn_kwargs is None)
                     key = self.stream.current.value
                     self.stream.skip(2)
                     value = self.parse_expression()
-                    kwargs.append(nodes.Keyword(key, value,
-                                                lineno=value.lineno))
+                    kwargs.append(nodes.Keyword(key, value, lineno=value.lineno))
                 else:
-                    ensure(not kwargs)
+                    # Parsing an arg
+                    ensure(dyn_args is None and dyn_kwargs is None and not kwargs)
                     args.append(self.parse_expression())
 
             require_comma = True
-        self.stream.expect('rparen')
 
-        if node is None:
-            return args, kwargs, dyn_args, dyn_kwargs
-        return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs,
-                          lineno=token.lineno)
+        self.stream.expect("rparen")
+        return args, kwargs, dyn_args, dyn_kwargs
 
-    def parse_filter(self, node, start_inline=False):
-        while self.stream.current.type == 'pipe' or start_inline:
+    def parse_call(self, node: nodes.Expr) -> nodes.Call:
+        # The lparen will be expected in parse_call_args, but the lineno
+        # needs to be recorded before the stream is advanced.
+        token = self.stream.current
+        args, kwargs, dyn_args, dyn_kwargs = self.parse_call_args()
+        return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno)
+
+    def parse_filter(
+        self, node: t.Optional[nodes.Expr], start_inline: bool = False
+    ) -> t.Optional[nodes.Expr]:
+        while self.stream.current.type == "pipe" or start_inline:
             if not start_inline:
                 next(self.stream)
-            token = self.stream.expect('name')
+            token = self.stream.expect("name")
             name = token.value
-            while self.stream.current.type == 'dot':
+            while self.stream.current.type == "dot":
                 next(self.stream)
-                name += '.' + self.stream.expect('name').value
-            if self.stream.current.type == 'lparen':
-                args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
+                name += "." + self.stream.expect("name").value
+            if self.stream.current.type == "lparen":
+                args, kwargs, dyn_args, dyn_kwargs = self.parse_call_args()
             else:
                 args = []
                 kwargs = []
                 dyn_args = dyn_kwargs = None
-            node = nodes.Filter(node, name, args, kwargs, dyn_args,
-                                dyn_kwargs, lineno=token.lineno)
+            node = nodes.Filter(
+                node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
+            )
             start_inline = False
         return node
 
-    def parse_test(self, node):
+    def parse_test(self, node: nodes.Expr) -> nodes.Expr:
         token = next(self.stream)
-        if self.stream.current.test('name:not'):
+        if self.stream.current.test("name:not"):
             next(self.stream)
             negated = True
         else:
             negated = False
-        name = self.stream.expect('name').value
-        while self.stream.current.type == 'dot':
+        name = self.stream.expect("name").value
+        while self.stream.current.type == "dot":
             next(self.stream)
-            name += '.' + self.stream.expect('name').value
+            name += "." + self.stream.expect("name").value
         dyn_args = dyn_kwargs = None
         kwargs = []
-        if self.stream.current.type == 'lparen':
-            args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
-        elif self.stream.current.type in ('name', 'string', 'integer',
-                                          'float', 'lparen', 'lbracket',
-                                          'lbrace') and not \
-             self.stream.current.test_any('name:else', 'name:or',
-                                          'name:and'):
-            if self.stream.current.test('name:is'):
-                self.fail('You cannot chain multiple tests with is')
-            args = [self.parse_expression()]
+        if self.stream.current.type == "lparen":
+            args, kwargs, dyn_args, dyn_kwargs = self.parse_call_args()
+        elif self.stream.current.type in {
+            "name",
+            "string",
+            "integer",
+            "float",
+            "lparen",
+            "lbracket",
+            "lbrace",
+        } and not self.stream.current.test_any("name:else", "name:or", "name:and"):
+            if self.stream.current.test("name:is"):
+                self.fail("You cannot chain multiple tests with is")
+            arg_node = self.parse_primary()
+            arg_node = self.parse_postfix(arg_node)
+            args = [arg_node]
         else:
             args = []
-        node = nodes.Test(node, name, args, kwargs, dyn_args,
-                          dyn_kwargs, lineno=token.lineno)
+        node = nodes.Test(
+            node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
+        )
         if negated:
             node = nodes.Not(node, lineno=token.lineno)
         return node
 
-    def subparse(self, end_tokens=None):
-        body = []
-        data_buffer = []
+    def subparse(
+        self, end_tokens: t.Optional[t.Tuple[str, ...]] = None
+    ) -> t.List[nodes.Node]:
+        body: t.List[nodes.Node] = []
+        data_buffer: t.List[nodes.Node] = []
         add_data = data_buffer.append
 
         if end_tokens is not None:
             self._end_token_stack.append(end_tokens)
 
-        def flush_data():
+        def flush_data() -> None:
             if data_buffer:
                 lineno = data_buffer[0].lineno
                 body.append(nodes.Output(data_buffer[:], lineno=lineno))
@@ -857,38 +995,37 @@
         try:
             while self.stream:
                 token = self.stream.current
-                if token.type == 'data':
+                if token.type == "data":
                     if token.value:
-                        add_data(nodes.TemplateData(token.value,
-                                                    lineno=token.lineno))
+                        add_data(nodes.TemplateData(token.value, lineno=token.lineno))
                     next(self.stream)
-                elif token.type == 'variable_begin':
+                elif token.type == "variable_begin":
                     next(self.stream)
                     add_data(self.parse_tuple(with_condexpr=True))
-                    self.stream.expect('variable_end')
-                elif token.type == 'block_begin':
+                    self.stream.expect("variable_end")
+                elif token.type == "block_begin":
                     flush_data()
                     next(self.stream)
-                    if end_tokens is not None and \
-                       self.stream.current.test_any(*end_tokens):
+                    if end_tokens is not None and self.stream.current.test_any(
+                        *end_tokens
+                    ):
                         return body
                     rv = self.parse_statement()
                     if isinstance(rv, list):
                         body.extend(rv)
                     else:
                         body.append(rv)
-                    self.stream.expect('block_end')
+                    self.stream.expect("block_end")
                 else:
-                    raise AssertionError('internal parsing error')
+                    raise AssertionError("internal parsing error")
 
             flush_data()
         finally:
             if end_tokens is not None:
                 self._end_token_stack.pop()
-
         return body
 
-    def parse(self):
+    def parse(self) -> nodes.Template:
         """Parse the whole template into a `Template` node."""
         result = nodes.Template(self.subparse(), lineno=1)
         result.set_environment(self.environment)

py.typed

diff --git a/py.typed b/py.typed
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/py.typed

py_srcs.gni

diff --git a/py_srcs.gni b/py_srcs.gni
index f58ae48..c3ddbd5 100644
--- a/py_srcs.gni
+++ b/py_srcs.gni
@@ -4,8 +4,8 @@
 # builds.
 third_party_jinja2_srcs = [
   "__init__.py",
-  "_compat.py",
-  "_stringdefs.py",
+  "_identifier.py",
+  "async_utils.py",
   "bccache.py",
   "compiler.py",
   "constants.py",
@@ -15,8 +15,11 @@
   "exceptions.py",
   "ext.py",
   "filters.py",
+  "idtracking.py",
   "lexer.py",
   "loaders.py",
+  "meta.py",
+  "nativetypes.py",
   "nodes.py",
   "optimizer.py",
   "parser.py",

runtime.py

diff --git a/runtime.py b/runtime.py
index 7791c64..985842b 100644
--- a/runtime.py
+++ b/runtime.py
@@ -1,58 +1,103 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.runtime
-    ~~~~~~~~~~~~~~
-
-    Runtime helpers.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD.
-"""
+"""The runtime functions and state used by compiled templates."""
+import functools
+import sys
+import typing as t
+from collections import abc
 from itertools import chain
-from jinja2.nodes import EvalContext, _context_function_types
-from jinja2.utils import Markup, soft_unicode, escape, missing, concat, \
-     internalcode, object_type_repr
-from jinja2.exceptions import UndefinedError, TemplateRuntimeError, \
-     TemplateNotFound
-from jinja2._compat import next, imap, text_type, iteritems, \
-     implements_iterator, implements_to_string, string_types, PY2
+
+from markupsafe import escape  # noqa: F401
+from markupsafe import Markup
+from markupsafe import soft_str
+
+from .async_utils import auto_aiter
+from .async_utils import auto_await  # noqa: F401
+from .exceptions import TemplateNotFound  # noqa: F401
+from .exceptions import TemplateRuntimeError  # noqa: F401
+from .exceptions import UndefinedError
+from .nodes import EvalContext
+from .utils import _PassArg
+from .utils import concat
+from .utils import internalcode
+from .utils import missing
+from .utils import Namespace  # noqa: F401
+from .utils import object_type_repr
+from .utils import pass_eval_context
+
+V = t.TypeVar("V")
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
+
+if t.TYPE_CHECKING:
+    import logging
+    import typing_extensions as te
+    from .environment import Environment
+
+    class LoopRenderFunc(te.Protocol):
+        def __call__(
+            self,
+            reciter: t.Iterable[V],
+            loop_render_func: "LoopRenderFunc",
+            depth: int = 0,
+        ) -> str:
+            ...
 
 
 # these variables are exported to the template runtime
-__all__ = ['LoopContext', 'TemplateReference', 'Macro', 'Markup',
-           'TemplateRuntimeError', 'missing', 'concat', 'escape',
-           'markup_join', 'unicode_join', 'to_string', 'identity',
-           'TemplateNotFound']
-
-#: the name of the function that is used to convert something into
-#: a string.  We can just use the text type here.
-to_string = text_type
-
-#: the identity function.  Useful for certain things in the environment
-identity = lambda x: x
-
-_last_iteration = object()
+exported = [
+    "LoopContext",
+    "TemplateReference",
+    "Macro",
+    "Markup",
+    "TemplateRuntimeError",
+    "missing",
+    "escape",
+    "markup_join",
+    "str_join",
+    "identity",
+    "TemplateNotFound",
+    "Namespace",
+    "Undefined",
+    "internalcode",
+]
+async_exported = [
+    "AsyncLoopContext",
+    "auto_aiter",
+    "auto_await",
+]
 
 
-def markup_join(seq):
-    """Concatenation that escapes if necessary and converts to unicode."""
+def identity(x: V) -> V:
+    """Returns its argument. Useful for certain things in the
+    environment.
+    """
+    return x
+
+
+def markup_join(seq: t.Iterable[t.Any]) -> str:
+    """Concatenation that escapes if necessary and converts to string."""
     buf = []
-    iterator = imap(soft_unicode, seq)
+    iterator = map(soft_str, seq)
     for arg in iterator:
         buf.append(arg)
-        if hasattr(arg, '__html__'):
-            return Markup(u'').join(chain(buf, iterator))
+        if hasattr(arg, "__html__"):
+            return Markup("").join(chain(buf, iterator))
     return concat(buf)
 
 
-def unicode_join(seq):
-    """Simple args to unicode conversion and concatenation."""
-    return concat(imap(text_type, seq))
+def str_join(seq: t.Iterable[t.Any]) -> str:
+    """Simple args to string conversion and concatenation."""
+    return concat(map(str, seq))
 
 
-def new_context(environment, template_name, blocks, vars=None,
-                shared=None, globals=None, locals=None):
-    """Internal helper to for context creation."""
+def new_context(
+    environment: "Environment",
+    template_name: t.Optional[str],
+    blocks: t.Dict[str, t.Callable[["Context"], t.Iterator[str]]],
+    vars: t.Optional[t.Dict[str, t.Any]] = None,
+    shared: bool = False,
+    globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    locals: t.Optional[t.Mapping[str, t.Any]] = None,
+) -> "Context":
+    """Internal helper for context creation."""
     if vars is None:
         vars = {}
     if shared:
@@ -64,30 +109,38 @@
         # we don't want to modify the dict passed
         if shared:
             parent = dict(parent)
-        for key, value in iteritems(locals):
-            if key[:2] == 'l_' and value is not missing:
-                parent[key[2:]] = value
-    return Context(environment, parent, template_name, blocks)
+        for key, value in locals.items():
+            if value is not missing:
+                parent[key] = value
+    return environment.context_class(
+        environment, parent, template_name, blocks, globals=globals
+    )
 
 
-class TemplateReference(object):
+class TemplateReference:
     """The `self` in templates."""
 
-    def __init__(self, context):
+    def __init__(self, context: "Context") -> None:
         self.__context = context
 
-    def __getitem__(self, name):
+    def __getitem__(self, name: str) -> t.Any:
         blocks = self.__context.blocks[name]
         return BlockReference(name, self.__context, blocks, 0)
 
-    def __repr__(self):
-        return '<%s %r>' % (
-            self.__class__.__name__,
-            self.__context.name
-        )
+    def __repr__(self) -> str:
+        return f"<{type(self).__name__} {self.__context.name!r}>"
 
 
-class Context(object):
+def _dict_method_all(dict_method: F) -> F:
+    @functools.wraps(dict_method)
+    def f_all(self: "Context") -> t.Any:
+        return dict_method(self.get_all())
+
+    return t.cast(F, f_all)
+
+
+@abc.Mapping.register
+class Context:
     """The template context holds the variables of a template.  It stores the
     values passed to the template and also the names the template exports.
     Creating instances is neither supported nor useful as it's created
@@ -97,7 +150,7 @@
     The context is immutable.  Modifications on :attr:`parent` **must not**
     happen and modifications on :attr:`vars` are allowed from generated
     template code only.  Template filters and global functions marked as
-    :func:`contextfunction`\s get the active context passed as first argument
+    :func:`pass_context` get the active context passed as first argument
     and are allowed to access the context read-only.
 
     The template context supports read only dict operations (`get`,
@@ -106,340 +159,634 @@
     method that doesn't fail with a `KeyError` but returns an
     :class:`Undefined` object for missing variables.
     """
-    __slots__ = ('parent', 'vars', 'environment', 'eval_ctx', 'exported_vars',
-                 'name', 'blocks', '__weakref__')
 
-    def __init__(self, environment, parent, name, blocks):
+    def __init__(
+        self,
+        environment: "Environment",
+        parent: t.Dict[str, t.Any],
+        name: t.Optional[str],
+        blocks: t.Dict[str, t.Callable[["Context"], t.Iterator[str]]],
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ):
         self.parent = parent
-        self.vars = {}
-        self.environment = environment
+        self.vars: t.Dict[str, t.Any] = {}
+        self.environment: "Environment" = environment
         self.eval_ctx = EvalContext(self.environment, name)
-        self.exported_vars = set()
+        self.exported_vars: t.Set[str] = set()
         self.name = name
+        self.globals_keys = set() if globals is None else set(globals)
 
         # create the initial mapping of blocks.  Whenever template inheritance
         # takes place the runtime will update this mapping with the new blocks
         # from the template.
-        self.blocks = dict((k, [v]) for k, v in iteritems(blocks))
+        self.blocks = {k: [v] for k, v in blocks.items()}
 
-    def super(self, name, current):
+    def super(
+        self, name: str, current: t.Callable[["Context"], t.Iterator[str]]
+    ) -> t.Union["BlockReference", "Undefined"]:
         """Render a parent block."""
         try:
             blocks = self.blocks[name]
             index = blocks.index(current) + 1
             blocks[index]
         except LookupError:
-            return self.environment.undefined('there is no parent block '
-                                              'called %r.' % name,
-                                              name='super')
+            return self.environment.undefined(
+                f"there is no parent block called {name!r}.", name="super"
+            )
         return BlockReference(name, self, blocks, index)
 
-    def get(self, key, default=None):
-        """Returns an item from the template context, if it doesn't exist
-        `default` is returned.
+    def get(self, key: str, default: t.Any = None) -> t.Any:
+        """Look up a variable by name, or return a default if the key is
+        not found.
+
+        :param key: The variable name to look up.
+        :param default: The value to return if the key is not found.
         """
         try:
             return self[key]
         except KeyError:
             return default
 
-    def resolve(self, key):
-        """Looks up a variable like `__getitem__` or `get` but returns an
-        :class:`Undefined` object with the name of the name looked up.
+    def resolve(self, key: str) -> t.Union[t.Any, "Undefined"]:
+        """Look up a variable by name, or return an :class:`Undefined`
+        object if the key is not found.
+
+        If you need to add custom behavior, override
+        :meth:`resolve_or_missing`, not this method. The various lookup
+        functions use that method, not this one.
+
+        :param key: The variable name to look up.
+        """
+        rv = self.resolve_or_missing(key)
+
+        if rv is missing:
+            return self.environment.undefined(name=key)
+
+        return rv
+
+    def resolve_or_missing(self, key: str) -> t.Any:
+        """Look up a variable by name, or return a ``missing`` sentinel
+        if the key is not found.
+
+        Override this method to add custom lookup behavior.
+        :meth:`resolve`, :meth:`get`, and :meth:`__getitem__` use this
+        method. Don't call this method directly.
+
+        :param key: The variable name to look up.
         """
         if key in self.vars:
             return self.vars[key]
+
         if key in self.parent:
             return self.parent[key]
-        return self.environment.undefined(name=key)
 
-    def get_exported(self):
+        return missing
+
+    def get_exported(self) -> t.Dict[str, t.Any]:
         """Get a new dict with the exported variables."""
-        return dict((k, self.vars[k]) for k in self.exported_vars)
+        return {k: self.vars[k] for k in self.exported_vars}
 
-    def get_all(self):
-        """Return a copy of the complete context as dict including the
-        exported variables.
+    def get_all(self) -> t.Dict[str, t.Any]:
+        """Return the complete context as dict including the exported
+        variables.  For optimizations reasons this might not return an
+        actual copy so be careful with using it.
         """
+        if not self.vars:
+            return self.parent
+        if not self.parent:
+            return self.vars
         return dict(self.parent, **self.vars)
 
     @internalcode
-    def call(__self, __obj, *args, **kwargs):
+    def call(
+        __self, __obj: t.Callable, *args: t.Any, **kwargs: t.Any  # noqa: B902
+    ) -> t.Union[t.Any, "Undefined"]:
         """Call the callable with the arguments and keyword arguments
         provided but inject the active context or environment as first
-        argument if the callable is a :func:`contextfunction` or
-        :func:`environmentfunction`.
+        argument if the callable has :func:`pass_context` or
+        :func:`pass_environment`.
         """
         if __debug__:
-            __traceback_hide__ = True
+            __traceback_hide__ = True  # noqa
 
         # Allow callable classes to take a context
-        fn = __obj.__call__
-        for fn_type in ('contextfunction',
-                        'evalcontextfunction',
-                        'environmentfunction'):
-            if hasattr(fn, fn_type):
-                __obj = fn
-                break
+        if (
+            hasattr(__obj, "__call__")  # noqa: B004
+            and _PassArg.from_obj(__obj.__call__) is not None  # type: ignore
+        ):
+            __obj = __obj.__call__  # type: ignore
 
-        if isinstance(__obj, _context_function_types):
-            if getattr(__obj, 'contextfunction', 0):
-                args = (__self,) + args
-            elif getattr(__obj, 'evalcontextfunction', 0):
-                args = (__self.eval_ctx,) + args
-            elif getattr(__obj, 'environmentfunction', 0):
-                args = (__self.environment,) + args
+        pass_arg = _PassArg.from_obj(__obj)
+
+        if pass_arg is _PassArg.context:
+            # the active context should have access to variables set in
+            # loops and blocks without mutating the context itself
+            if kwargs.get("_loop_vars"):
+                __self = __self.derived(kwargs["_loop_vars"])
+            if kwargs.get("_block_vars"):
+                __self = __self.derived(kwargs["_block_vars"])
+            args = (__self,) + args
+        elif pass_arg is _PassArg.eval_context:
+            args = (__self.eval_ctx,) + args
+        elif pass_arg is _PassArg.environment:
+            args = (__self.environment,) + args
+
+        kwargs.pop("_block_vars", None)
+        kwargs.pop("_loop_vars", None)
+
         try:
             return __obj(*args, **kwargs)
         except StopIteration:
-            return __self.environment.undefined('value was undefined because '
-                                                'a callable raised a '
-                                                'StopIteration exception')
+            return __self.environment.undefined(
+                "value was undefined because a callable raised a"
+                " StopIteration exception"
+            )
 
-    def derived(self, locals=None):
-        """Internal helper function to create a derived context."""
-        context = new_context(self.environment, self.name, {},
-                              self.parent, True, None, locals)
-        context.vars.update(self.vars)
+    def derived(self, locals: t.Optional[t.Dict[str, t.Any]] = None) -> "Context":
+        """Internal helper function to create a derived context.  This is
+        used in situations where the system needs a new context in the same
+        template that is independent.
+        """
+        context = new_context(
+            self.environment, self.name, {}, self.get_all(), True, None, locals
+        )
         context.eval_ctx = self.eval_ctx
-        context.blocks.update((k, list(v)) for k, v in iteritems(self.blocks))
+        context.blocks.update((k, list(v)) for k, v in self.blocks.items())
         return context
 
-    def _all(meth):
-        proxy = lambda self: getattr(self.get_all(), meth)()
-        proxy.__doc__ = getattr(dict, meth).__doc__
-        proxy.__name__ = meth
-        return proxy
+    keys = _dict_method_all(dict.keys)
+    values = _dict_method_all(dict.values)
+    items = _dict_method_all(dict.items)
 
-    keys = _all('keys')
-    values = _all('values')
-    items = _all('items')
-
-    # not available on python 3
-    if PY2:
-        iterkeys = _all('iterkeys')
-        itervalues = _all('itervalues')
-        iteritems = _all('iteritems')
-    del _all
-
-    def __contains__(self, name):
+    def __contains__(self, name: str) -> bool:
         return name in self.vars or name in self.parent
 
-    def __getitem__(self, key):
-        """Lookup a variable or raise `KeyError` if the variable is
-        undefined.
+    def __getitem__(self, key: str) -> t.Any:
+        """Look up a variable by name with ``[]`` syntax, or raise a
+        ``KeyError`` if the key is not found.
         """
-        item = self.resolve(key)
-        if isinstance(item, Undefined):
+        item = self.resolve_or_missing(key)
+
+        if item is missing:
             raise KeyError(key)
+
         return item
 
-    def __repr__(self):
-        return '<%s %s of %r>' % (
-            self.__class__.__name__,
-            repr(self.get_all()),
-            self.name
-        )
+    def __repr__(self) -> str:
+        return f"<{type(self).__name__} {self.get_all()!r} of {self.name!r}>"
 
 
-# register the context as mapping if possible
-try:
-    from collections import Mapping
-    Mapping.register(Context)
-except ImportError:
-    pass
-
-
-class BlockReference(object):
+class BlockReference:
     """One block on a template reference."""
 
-    def __init__(self, name, context, stack, depth):
+    def __init__(
+        self,
+        name: str,
+        context: "Context",
+        stack: t.List[t.Callable[["Context"], t.Iterator[str]]],
+        depth: int,
+    ) -> None:
         self.name = name
         self._context = context
         self._stack = stack
         self._depth = depth
 
     @property
-    def super(self):
+    def super(self) -> t.Union["BlockReference", "Undefined"]:
         """Super the block."""
         if self._depth + 1 >= len(self._stack):
-            return self._context.environment. \
-                undefined('there is no parent block called %r.' %
-                          self.name, name='super')
-        return BlockReference(self.name, self._context, self._stack,
-                              self._depth + 1)
+            return self._context.environment.undefined(
+                f"there is no parent block called {self.name!r}.", name="super"
+            )
+        return BlockReference(self.name, self._context, self._stack, self._depth + 1)
 
     @internalcode
-    def __call__(self):
-        rv = concat(self._stack[self._depth](self._context))
+    async def _async_call(self) -> str:
+        rv = concat(
+            [x async for x in self._stack[self._depth](self._context)]  # type: ignore
+        )
+
         if self._context.eval_ctx.autoescape:
-            rv = Markup(rv)
+            return Markup(rv)
+
+        return rv
+
+    @internalcode
+    def __call__(self) -> str:
+        if self._context.environment.is_async:
+            return self._async_call()  # type: ignore
+
+        rv = concat(self._stack[self._depth](self._context))
+
+        if self._context.eval_ctx.autoescape:
+            return Markup(rv)
+
         return rv
 
 
-class LoopContext(object):
-    """A loop context for dynamic iteration."""
+class LoopContext:
+    """A wrapper iterable for dynamic ``for`` loops, with information
+    about the loop and iteration.
+    """
 
-    def __init__(self, iterable, recurse=None, depth0=0):
-        self._iterator = iter(iterable)
+    #: Current iteration of the loop, starting at 0.
+    index0 = -1
+
+    _length: t.Optional[int] = None
+    _after: t.Any = missing
+    _current: t.Any = missing
+    _before: t.Any = missing
+    _last_changed_value: t.Any = missing
+
+    def __init__(
+        self,
+        iterable: t.Iterable[V],
+        undefined: t.Type["Undefined"],
+        recurse: t.Optional["LoopRenderFunc"] = None,
+        depth0: int = 0,
+    ) -> None:
+        """
+        :param iterable: Iterable to wrap.
+        :param undefined: :class:`Undefined` class to use for next and
+            previous items.
+        :param recurse: The function to render the loop body when the
+            loop is marked recursive.
+        :param depth0: Incremented when looping recursively.
+        """
+        self._iterable = iterable
+        self._iterator = self._to_iterator(iterable)
+        self._undefined = undefined
         self._recurse = recurse
-        self._after = self._safe_next()
-        self.index0 = -1
+        #: How many levels deep a recursive loop currently is, starting at 0.
         self.depth0 = depth0
 
-        # try to get the length of the iterable early.  This must be done
-        # here because there are some broken iterators around where there
-        # __len__ is the number of iterations left (i'm looking at your
-        # listreverseiterator!).
-        try:
-            self._length = len(iterable)
-        except (TypeError, AttributeError):
-            self._length = None
-
-    def cycle(self, *args):
-        """Cycles among the arguments with the current loop index."""
-        if not args:
-            raise TypeError('no items for cycling given')
-        return args[self.index0 % len(args)]
-
-    first = property(lambda x: x.index0 == 0)
-    last = property(lambda x: x._after is _last_iteration)
-    index = property(lambda x: x.index0 + 1)
-    revindex = property(lambda x: x.length - x.index0)
-    revindex0 = property(lambda x: x.length - x.index)
-    depth = property(lambda x: x.depth0 + 1)
-
-    def __len__(self):
-        return self.length
-
-    def __iter__(self):
-        return LoopContextIterator(self)
-
-    def _safe_next(self):
-        try:
-            return next(self._iterator)
-        except StopIteration:
-            return _last_iteration
-
-    @internalcode
-    def loop(self, iterable):
-        if self._recurse is None:
-            raise TypeError('Tried to call non recursive loop.  Maybe you '
-                            "forgot the 'recursive' modifier.")
-        return self._recurse(iterable, self._recurse, self.depth0 + 1)
-
-    # a nifty trick to enhance the error message if someone tried to call
-    # the the loop without or with too many arguments.
-    __call__ = loop
-    del loop
+    @staticmethod
+    def _to_iterator(iterable: t.Iterable[V]) -> t.Iterator[V]:
+        return iter(iterable)
 
     @property
-    def length(self):
-        if self._length is None:
-            # if was not possible to get the length of the iterator when
-            # the loop context was created (ie: iterating over a generator)
-            # we have to convert the iterable into a sequence and use the
-            # length of that.
-            iterable = tuple(self._iterator)
-            self._iterator = iter(iterable)
-            self._length = len(iterable) + self.index0 + 1
+    def length(self) -> int:
+        """Length of the iterable.
+
+        If the iterable is a generator or otherwise does not have a
+        size, it is eagerly evaluated to get a size.
+        """
+        if self._length is not None:
+            return self._length
+
+        try:
+            self._length = len(self._iterable)  # type: ignore
+        except TypeError:
+            iterable = list(self._iterator)
+            self._iterator = self._to_iterator(iterable)
+            self._length = len(iterable) + self.index + (self._after is not missing)
+
         return self._length
 
-    def __repr__(self):
-        return '<%s %r/%r>' % (
-            self.__class__.__name__,
-            self.index,
-            self.length
-        )
+    def __len__(self) -> int:
+        return self.length
 
+    @property
+    def depth(self) -> int:
+        """How many levels deep a recursive loop currently is, starting at 1."""
+        return self.depth0 + 1
 
-@implements_iterator
-class LoopContextIterator(object):
-    """The iterator for a loop context."""
-    __slots__ = ('context',)
+    @property
+    def index(self) -> int:
+        """Current iteration of the loop, starting at 1."""
+        return self.index0 + 1
 
-    def __init__(self, context):
-        self.context = context
+    @property
+    def revindex0(self) -> int:
+        """Number of iterations from the end of the loop, ending at 0.
 
-    def __iter__(self):
+        Requires calculating :attr:`length`.
+        """
+        return self.length - self.index
+
+    @property
+    def revindex(self) -> int:
+        """Number of iterations from the end of the loop, ending at 1.
+
+        Requires calculating :attr:`length`.
+        """
+        return self.length - self.index0
+
+    @property
+    def first(self) -> bool:
+        """Whether this is the first iteration of the loop."""
+        return self.index0 == 0
+
+    def _peek_next(self) -> t.Any:
+        """Return the next element in the iterable, or :data:`missing`
+        if the iterable is exhausted. Only peeks one item ahead, caching
+        the result in :attr:`_last` for use in subsequent checks. The
+        cache is reset when :meth:`__next__` is called.
+        """
+        if self._after is not missing:
+            return self._after
+
+        self._after = next(self._iterator, missing)
+        return self._after
+
+    @property
+    def last(self) -> bool:
+        """Whether this is the last iteration of the loop.
+
+        Causes the iterable to advance early. See
+        :func:`itertools.groupby` for issues this can cause.
+        The :func:`groupby` filter avoids that issue.
+        """
+        return self._peek_next() is missing
+
+    @property
+    def previtem(self) -> t.Union[t.Any, "Undefined"]:
+        """The item in the previous iteration. Undefined during the
+        first iteration.
+        """
+        if self.first:
+            return self._undefined("there is no previous item")
+
+        return self._before
+
+    @property
+    def nextitem(self) -> t.Union[t.Any, "Undefined"]:
+        """The item in the next iteration. Undefined during the last
+        iteration.
+
+        Causes the iterable to advance early. See
+        :func:`itertools.groupby` for issues this can cause.
+        The :func:`jinja-filters.groupby` filter avoids that issue.
+        """
+        rv = self._peek_next()
+
+        if rv is missing:
+            return self._undefined("there is no next item")
+
+        return rv
+
+    def cycle(self, *args: V) -> V:
+        """Return a value from the given args, cycling through based on
+        the current :attr:`index0`.
+
+        :param args: One or more values to cycle through.
+        """
+        if not args:
+            raise TypeError("no items for cycling given")
+
+        return args[self.index0 % len(args)]
+
+    def changed(self, *value: t.Any) -> bool:
+        """Return ``True`` if previously called with a different value
+        (including when called for the first time).
+
+        :param value: One or more values to compare to the last call.
+        """
+        if self._last_changed_value != value:
+            self._last_changed_value = value
+            return True
+
+        return False
+
+    def __iter__(self) -> "LoopContext":
         return self
 
-    def __next__(self):
-        ctx = self.context
-        ctx.index0 += 1
-        if ctx._after is _last_iteration:
-            raise StopIteration()
-        next_elem = ctx._after
-        ctx._after = ctx._safe_next()
-        return next_elem, ctx
+    def __next__(self) -> t.Tuple[t.Any, "LoopContext"]:
+        if self._after is not missing:
+            rv = self._after
+            self._after = missing
+        else:
+            rv = next(self._iterator)
+
+        self.index0 += 1
+        self._before = self._current
+        self._current = rv
+        return rv, self
+
+    @internalcode
+    def __call__(self, iterable: t.Iterable[V]) -> str:
+        """When iterating over nested data, render the body of the loop
+        recursively with the given inner iterable data.
+
+        The loop must have the ``recursive`` marker for this to work.
+        """
+        if self._recurse is None:
+            raise TypeError(
+                "The loop must have the 'recursive' marker to be called recursively."
+            )
+
+        return self._recurse(iterable, self._recurse, depth=self.depth)
+
+    def __repr__(self) -> str:
+        return f"<{type(self).__name__} {self.index}/{self.length}>"
 
 
-class Macro(object):
+class AsyncLoopContext(LoopContext):
+    _iterator: t.AsyncIterator[t.Any]  # type: ignore
+
+    @staticmethod
+    def _to_iterator(  # type: ignore
+        iterable: t.Union[t.Iterable[V], t.AsyncIterable[V]]
+    ) -> t.AsyncIterator[V]:
+        return auto_aiter(iterable)
+
+    @property
+    async def length(self) -> int:  # type: ignore
+        if self._length is not None:
+            return self._length
+
+        try:
+            self._length = len(self._iterable)  # type: ignore
+        except TypeError:
+            iterable = [x async for x in self._iterator]
+            self._iterator = self._to_iterator(iterable)
+            self._length = len(iterable) + self.index + (self._after is not missing)
+
+        return self._length
+
+    @property
+    async def revindex0(self) -> int:  # type: ignore
+        return await self.length - self.index
+
+    @property
+    async def revindex(self) -> int:  # type: ignore
+        return await self.length - self.index0
+
+    async def _peek_next(self) -> t.Any:
+        if self._after is not missing:
+            return self._after
+
+        try:
+            self._after = await self._iterator.__anext__()
+        except StopAsyncIteration:
+            self._after = missing
+
+        return self._after
+
+    @property
+    async def last(self) -> bool:  # type: ignore
+        return await self._peek_next() is missing
+
+    @property
+    async def nextitem(self) -> t.Union[t.Any, "Undefined"]:
+        rv = await self._peek_next()
+
+        if rv is missing:
+            return self._undefined("there is no next item")
+
+        return rv
+
+    def __aiter__(self) -> "AsyncLoopContext":
+        return self
+
+    async def __anext__(self) -> t.Tuple[t.Any, "AsyncLoopContext"]:
+        if self._after is not missing:
+            rv = self._after
+            self._after = missing
+        else:
+            rv = await self._iterator.__anext__()
+
+        self.index0 += 1
+        self._before = self._current
+        self._current = rv
+        return rv, self
+
+
+class Macro:
     """Wraps a macro function."""
 
-    def __init__(self, environment, func, name, arguments, defaults,
-                 catch_kwargs, catch_varargs, caller):
+    def __init__(
+        self,
+        environment: "Environment",
+        func: t.Callable[..., str],
+        name: str,
+        arguments: t.List[str],
+        catch_kwargs: bool,
+        catch_varargs: bool,
+        caller: bool,
+        default_autoescape: t.Optional[bool] = None,
+    ):
         self._environment = environment
         self._func = func
         self._argument_count = len(arguments)
         self.name = name
         self.arguments = arguments
-        self.defaults = defaults
         self.catch_kwargs = catch_kwargs
         self.catch_varargs = catch_varargs
         self.caller = caller
+        self.explicit_caller = "caller" in arguments
+
+        if default_autoescape is None:
+            if callable(environment.autoescape):
+                default_autoescape = environment.autoescape(None)
+            else:
+                default_autoescape = environment.autoescape
+
+        self._default_autoescape = default_autoescape
 
     @internalcode
-    def __call__(self, *args, **kwargs):
+    @pass_eval_context
+    def __call__(self, *args: t.Any, **kwargs: t.Any) -> str:
+        # This requires a bit of explanation,  In the past we used to
+        # decide largely based on compile-time information if a macro is
+        # safe or unsafe.  While there was a volatile mode it was largely
+        # unused for deciding on escaping.  This turns out to be
+        # problematic for macros because whether a macro is safe depends not
+        # on the escape mode when it was defined, but rather when it was used.
+        #
+        # Because however we export macros from the module system and
+        # there are historic callers that do not pass an eval context (and
+        # will continue to not pass one), we need to perform an instance
+        # check here.
+        #
+        # This is considered safe because an eval context is not a valid
+        # argument to callables otherwise anyway.  Worst case here is
+        # that if no eval context is passed we fall back to the compile
+        # time autoescape flag.
+        if args and isinstance(args[0], EvalContext):
+            autoescape = args[0].autoescape
+            args = args[1:]
+        else:
+            autoescape = self._default_autoescape
+
         # try to consume the positional arguments
-        arguments = list(args[:self._argument_count])
+        arguments = list(args[: self._argument_count])
         off = len(arguments)
 
+        # For information why this is necessary refer to the handling
+        # of caller in the `macro_body` handler in the compiler.
+        found_caller = False
+
         # if the number of arguments consumed is not the number of
         # arguments expected we start filling in keyword arguments
         # and defaults.
         if off != self._argument_count:
-            for idx, name in enumerate(self.arguments[len(arguments):]):
+            for name in self.arguments[len(arguments) :]:
                 try:
                     value = kwargs.pop(name)
                 except KeyError:
-                    try:
-                        value = self.defaults[idx - self._argument_count + off]
-                    except IndexError:
-                        value = self._environment.undefined(
-                            'parameter %r was not provided' % name, name=name)
+                    value = missing
+                if name == "caller":
+                    found_caller = True
                 arguments.append(value)
+        else:
+            found_caller = self.explicit_caller
 
         # it's important that the order of these arguments does not change
         # if not also changed in the compiler's `function_scoping` method.
         # the order is caller, keyword arguments, positional arguments!
-        if self.caller:
-            caller = kwargs.pop('caller', None)
+        if self.caller and not found_caller:
+            caller = kwargs.pop("caller", None)
             if caller is None:
-                caller = self._environment.undefined('No caller defined',
-                                                     name='caller')
+                caller = self._environment.undefined("No caller defined", name="caller")
             arguments.append(caller)
+
         if self.catch_kwargs:
             arguments.append(kwargs)
         elif kwargs:
-            raise TypeError('macro %r takes no keyword argument %r' %
-                            (self.name, next(iter(kwargs))))
+            if "caller" in kwargs:
+                raise TypeError(
+                    f"macro {self.name!r} was invoked with two values for the special"
+                    " caller argument. This is most likely a bug."
+                )
+            raise TypeError(
+                f"macro {self.name!r} takes no keyword argument {next(iter(kwargs))!r}"
+            )
         if self.catch_varargs:
-            arguments.append(args[self._argument_count:])
+            arguments.append(args[self._argument_count :])
         elif len(args) > self._argument_count:
-            raise TypeError('macro %r takes not more than %d argument(s)' %
-                            (self.name, len(self.arguments)))
-        return self._func(*arguments)
+            raise TypeError(
+                f"macro {self.name!r} takes not more than"
+                f" {len(self.arguments)} argument(s)"
+            )
 
-    def __repr__(self):
-        return '<%s %s>' % (
-            self.__class__.__name__,
-            self.name is None and 'anonymous' or repr(self.name)
-        )
+        return self._invoke(arguments, autoescape)
+
+    async def _async_invoke(self, arguments: t.List[t.Any], autoescape: bool) -> str:
+        rv = await self._func(*arguments)  # type: ignore
+
+        if autoescape:
+            return Markup(rv)
+
+        return rv  # type: ignore
+
+    def _invoke(self, arguments: t.List[t.Any], autoescape: bool) -> str:
+        if self._environment.is_async:
+            return self._async_invoke(arguments, autoescape)  # type: ignore
+
+        rv = self._func(*arguments)
+
+        if autoescape:
+            rv = Markup(rv)
+
+        return rv
+
+    def __repr__(self) -> str:
+        name = "anonymous" if self.name is None else repr(self.name)
+        return f"<{type(self).__name__} {name}>"
 
 
-@implements_to_string
-class Undefined(object):
+class Undefined:
     """The default undefined type.  This undefined type can be printed and
     iterated over, but every other access will raise an :exc:`UndefinedError`:
 
@@ -451,79 +798,193 @@
     >>> foo + 42
     Traceback (most recent call last):
       ...
-    UndefinedError: 'foo' is undefined
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
     """
-    __slots__ = ('_undefined_hint', '_undefined_obj', '_undefined_name',
-                 '_undefined_exception')
 
-    def __init__(self, hint=None, obj=missing, name=None, exc=UndefinedError):
+    __slots__ = (
+        "_undefined_hint",
+        "_undefined_obj",
+        "_undefined_name",
+        "_undefined_exception",
+    )
+
+    def __init__(
+        self,
+        hint: t.Optional[str] = None,
+        obj: t.Any = missing,
+        name: t.Optional[str] = None,
+        exc: t.Type[TemplateRuntimeError] = UndefinedError,
+    ) -> None:
         self._undefined_hint = hint
         self._undefined_obj = obj
         self._undefined_name = name
         self._undefined_exception = exc
 
-    @internalcode
-    def _fail_with_undefined_error(self, *args, **kwargs):
-        """Regular callback function for undefined objects that raises an
-        `UndefinedError` on call.
+    @property
+    def _undefined_message(self) -> str:
+        """Build a message about the undefined value based on how it was
+        accessed.
         """
-        if self._undefined_hint is None:
-            if self._undefined_obj is missing:
-                hint = '%r is undefined' % self._undefined_name
-            elif not isinstance(self._undefined_name, string_types):
-                hint = '%s has no element %r' % (
-                    object_type_repr(self._undefined_obj),
-                    self._undefined_name
-                )
-            else:
-                hint = '%r has no attribute %r' % (
-                    object_type_repr(self._undefined_obj),
-                    self._undefined_name
-                )
-        else:
-            hint = self._undefined_hint
-        raise self._undefined_exception(hint)
+        if self._undefined_hint:
+            return self._undefined_hint
+
+        if self._undefined_obj is missing:
+            return f"{self._undefined_name!r} is undefined"
+
+        if not isinstance(self._undefined_name, str):
+            return (
+                f"{object_type_repr(self._undefined_obj)} has no"
+                f" element {self._undefined_name!r}"
+            )
+
+        return (
+            f"{object_type_repr(self._undefined_obj)!r} has no"
+            f" attribute {self._undefined_name!r}"
+        )
 
     @internalcode
-    def __getattr__(self, name):
-        if name[:2] == '__':
+    def _fail_with_undefined_error(
+        self, *args: t.Any, **kwargs: t.Any
+    ) -> "te.NoReturn":
+        """Raise an :exc:`UndefinedError` when operations are performed
+        on the undefined value.
+        """
+        raise self._undefined_exception(self._undefined_message)
+
+    @internalcode
+    def __getattr__(self, name: str) -> t.Any:
+        if name[:2] == "__":
             raise AttributeError(name)
+
         return self._fail_with_undefined_error()
 
-    __add__ = __radd__ = __mul__ = __rmul__ = __div__ = __rdiv__ = \
-    __truediv__ = __rtruediv__ = __floordiv__ = __rfloordiv__ = \
-    __mod__ = __rmod__ = __pos__ = __neg__ = __call__ = \
-    __getitem__ = __lt__ = __le__ = __gt__ = __ge__ = __int__ = \
-    __float__ = __complex__ = __pow__ = __rpow__ = \
-        _fail_with_undefined_error
+    __add__ = __radd__ = __sub__ = __rsub__ = _fail_with_undefined_error
+    __mul__ = __rmul__ = __div__ = __rdiv__ = _fail_with_undefined_error
+    __truediv__ = __rtruediv__ = _fail_with_undefined_error
+    __floordiv__ = __rfloordiv__ = _fail_with_undefined_error
+    __mod__ = __rmod__ = _fail_with_undefined_error
+    __pos__ = __neg__ = _fail_with_undefined_error
+    __call__ = __getitem__ = _fail_with_undefined_error
+    __lt__ = __le__ = __gt__ = __ge__ = _fail_with_undefined_error
+    __int__ = __float__ = __complex__ = _fail_with_undefined_error
+    __pow__ = __rpow__ = _fail_with_undefined_error
 
-    def __eq__(self, other):
+    def __eq__(self, other: t.Any) -> bool:
         return type(self) is type(other)
 
-    def __ne__(self, other):
+    def __ne__(self, other: t.Any) -> bool:
         return not self.__eq__(other)
 
-    def __hash__(self):
+    def __hash__(self) -> int:
         return id(type(self))
 
-    def __str__(self):
-        return u''
+    def __str__(self) -> str:
+        return ""
 
-    def __len__(self):
+    def __len__(self) -> int:
         return 0
 
-    def __iter__(self):
-        if 0:
-            yield None
+    def __iter__(self) -> t.Iterator[t.Any]:
+        yield from ()
 
-    def __nonzero__(self):
+    async def __aiter__(self) -> t.AsyncIterator[t.Any]:
+        for _ in ():
+            yield
+
+    def __bool__(self) -> bool:
         return False
 
-    def __repr__(self):
-        return 'Undefined'
+    def __repr__(self) -> str:
+        return "Undefined"
 
 
-@implements_to_string
+def make_logging_undefined(
+    logger: t.Optional["logging.Logger"] = None, base: t.Type[Undefined] = Undefined
+) -> t.Type[Undefined]:
+    """Given a logger object this returns a new undefined class that will
+    log certain failures.  It will log iterations and printing.  If no
+    logger is given a default logger is created.
+
+    Example::
+
+        logger = logging.getLogger(__name__)
+        LoggingUndefined = make_logging_undefined(
+            logger=logger,
+            base=Undefined
+        )
+
+    .. versionadded:: 2.8
+
+    :param logger: the logger to use.  If not provided, a default logger
+                   is created.
+    :param base: the base class to add logging functionality to.  This
+                 defaults to :class:`Undefined`.
+    """
+    if logger is None:
+        import logging
+
+        logger = logging.getLogger(__name__)
+        logger.addHandler(logging.StreamHandler(sys.stderr))
+
+    def _log_message(undef: Undefined) -> None:
+        logger.warning(  # type: ignore
+            "Template variable warning: %s", undef._undefined_message
+        )
+
+    class LoggingUndefined(base):  # type: ignore
+        __slots__ = ()
+
+        def _fail_with_undefined_error(  # type: ignore
+            self, *args: t.Any, **kwargs: t.Any
+        ) -> "te.NoReturn":
+            try:
+                super()._fail_with_undefined_error(*args, **kwargs)
+            except self._undefined_exception as e:
+                logger.error("Template variable error: %s", e)  # type: ignore
+                raise e
+
+        def __str__(self) -> str:
+            _log_message(self)
+            return super().__str__()  # type: ignore
+
+        def __iter__(self) -> t.Iterator[t.Any]:
+            _log_message(self)
+            return super().__iter__()  # type: ignore
+
+        def __bool__(self) -> bool:
+            _log_message(self)
+            return super().__bool__()  # type: ignore
+
+    return LoggingUndefined
+
+
+class ChainableUndefined(Undefined):
+    """An undefined that is chainable, where both ``__getattr__`` and
+    ``__getitem__`` return itself rather than raising an
+    :exc:`UndefinedError`.
+
+    >>> foo = ChainableUndefined(name='foo')
+    >>> str(foo.bar['baz'])
+    ''
+    >>> foo.bar['baz'] + 42
+    Traceback (most recent call last):
+      ...
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
+
+    .. versionadded:: 2.11.0
+    """
+
+    __slots__ = ()
+
+    def __html__(self) -> str:
+        return str(self)
+
+    def __getattr__(self, _: str) -> "ChainableUndefined":
+        return self
+
+    __getitem__ = __getattr__  # type: ignore
+
+
 class DebugUndefined(Undefined):
     """An undefined that returns the debug info when printed.
 
@@ -535,22 +996,27 @@
     >>> foo + 42
     Traceback (most recent call last):
       ...
-    UndefinedError: 'foo' is undefined
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
     """
+
     __slots__ = ()
 
-    def __str__(self):
-        if self._undefined_hint is None:
-            if self._undefined_obj is missing:
-                return u'{{ %s }}' % self._undefined_name
-            return '{{ no such element: %s[%r] }}' % (
-                object_type_repr(self._undefined_obj),
-                self._undefined_name
+    def __str__(self) -> str:
+        if self._undefined_hint:
+            message = f"undefined value printed: {self._undefined_hint}"
+
+        elif self._undefined_obj is missing:
+            message = self._undefined_name  # type: ignore
+
+        else:
+            message = (
+                f"no such element: {object_type_repr(self._undefined_obj)}"
+                f"[{self._undefined_name!r}]"
             )
-        return u'{{ undefined value printed: %s }}' % self._undefined_hint
+
+        return f"{{{{ {message} }}}}"
 
 
-@implements_to_string
 class StrictUndefined(Undefined):
     """An undefined that barks on print and iteration as well as boolean
     tests and all kinds of comparisons.  In other words: you can do nothing
@@ -560,22 +1026,28 @@
     >>> str(foo)
     Traceback (most recent call last):
       ...
-    UndefinedError: 'foo' is undefined
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
     >>> not foo
     Traceback (most recent call last):
       ...
-    UndefinedError: 'foo' is undefined
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
     >>> foo + 42
     Traceback (most recent call last):
       ...
-    UndefinedError: 'foo' is undefined
+    jinja2.exceptions.UndefinedError: 'foo' is undefined
     """
+
     __slots__ = ()
-    __iter__ = __str__ = __len__ = __nonzero__ = __eq__ = \
-        __ne__ = __bool__ = __hash__ = \
-        Undefined._fail_with_undefined_error
+    __iter__ = __str__ = __len__ = Undefined._fail_with_undefined_error
+    __eq__ = __ne__ = __bool__ = __hash__ = Undefined._fail_with_undefined_error
+    __contains__ = Undefined._fail_with_undefined_error
 
 
-# remove remaining slots attributes, after the metaclass did the magic they
-# are unneeded and irritating as they contain wrong data for the subclasses.
-del Undefined.__slots__, DebugUndefined.__slots__, StrictUndefined.__slots__
+# Remove slots attributes, after the metaclass is applied they are
+# unneeded and contain wrong data for subclasses.
+del (
+    Undefined.__slots__,
+    ChainableUndefined.__slots__,
+    DebugUndefined.__slots__,
+    StrictUndefined.__slots__,
+)

sandbox.py

diff --git a/sandbox.py b/sandbox.py
index da479c1..06d7414 100644
--- a/sandbox.py
+++ b/sandbox.py
@@ -1,160 +1,168 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.sandbox
-    ~~~~~~~~~~~~~~
-
-    Adds a sandbox layer to Jinja as it was the default behavior in the old
-    Jinja 1 releases.  This sandbox is slightly different from Jinja 1 as the
-    default behavior is easier to use.
-
-    The behavior can be changed by subclassing the environment.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD.
+"""A sandbox layer that ensures unsafe operations cannot be performed.
+Useful when the template itself comes from an untrusted source.
 """
 import operator
-from jinja2.environment import Environment
-from jinja2.exceptions import SecurityError
-from jinja2._compat import string_types, function_type, method_type, \
-     traceback_type, code_type, frame_type, generator_type, PY2
+import types
+import typing as t
+from _string import formatter_field_name_split  # type: ignore
+from collections import abc
+from collections import deque
+from string import Formatter
 
+from markupsafe import EscapeFormatter
+from markupsafe import Markup
+
+from .environment import Environment
+from .exceptions import SecurityError
+from .runtime import Context
+from .runtime import Undefined
+
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
 
 #: maximum number of items a range may produce
 MAX_RANGE = 100000
 
-#: attributes of function objects that are considered unsafe.
-UNSAFE_FUNCTION_ATTRIBUTES = set(['func_closure', 'func_code', 'func_dict',
-                                  'func_defaults', 'func_globals'])
+#: Unsafe function attributes.
+UNSAFE_FUNCTION_ATTRIBUTES: t.Set[str] = set()
 
-#: unsafe method attributes.  function attributes are unsafe for methods too
-UNSAFE_METHOD_ATTRIBUTES = set(['im_class', 'im_func', 'im_self'])
+#: Unsafe method attributes. Function attributes are unsafe for methods too.
+UNSAFE_METHOD_ATTRIBUTES: t.Set[str] = set()
 
-#: unsafe generator attirbutes.
-UNSAFE_GENERATOR_ATTRIBUTES = set(['gi_frame', 'gi_code'])
+#: unsafe generator attributes.
+UNSAFE_GENERATOR_ATTRIBUTES = {"gi_frame", "gi_code"}
 
-# On versions > python 2 the special attributes on functions are gone,
-# but they remain on methods and generators for whatever reason.
-if not PY2:
-    UNSAFE_FUNCTION_ATTRIBUTES = set()
+#: unsafe attributes on coroutines
+UNSAFE_COROUTINE_ATTRIBUTES = {"cr_frame", "cr_code"}
 
-import warnings
+#: unsafe attributes on async generators
+UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = {"ag_code", "ag_frame"}
 
-# make sure we don't warn in python 2.6 about stuff we don't care about
-warnings.filterwarnings('ignore', 'the sets module', DeprecationWarning,
-                        module='jinja2.sandbox')
-
-from collections import deque
-
-_mutable_set_types = (set,)
-_mutable_mapping_types = (dict,)
-_mutable_sequence_types = (list,)
-
-
-# on python 2.x we can register the user collection types
-try:
-    from UserDict import UserDict, DictMixin
-    from UserList import UserList
-    _mutable_mapping_types += (UserDict, DictMixin)
-    _mutable_set_types += (UserList,)
-except ImportError:
-    pass
-
-# if sets is still available, register the mutable set from there as well
-try:
-    from sets import Set
-    _mutable_set_types += (Set,)
-except ImportError:
-    pass
-
-#: register Python 2.6 abstract base classes
-try:
-    from collections import MutableSet, MutableMapping, MutableSequence
-    _mutable_set_types += (MutableSet,)
-    _mutable_mapping_types += (MutableMapping,)
-    _mutable_sequence_types += (MutableSequence,)
-except ImportError:
-    pass
-
-_mutable_spec = (
-    (_mutable_set_types, frozenset([
-        'add', 'clear', 'difference_update', 'discard', 'pop', 'remove',
-        'symmetric_difference_update', 'update'
-    ])),
-    (_mutable_mapping_types, frozenset([
-        'clear', 'pop', 'popitem', 'setdefault', 'update'
-    ])),
-    (_mutable_sequence_types, frozenset([
-        'append', 'reverse', 'insert', 'sort', 'extend', 'remove'
-    ])),
-    (deque, frozenset([
-        'append', 'appendleft', 'clear', 'extend', 'extendleft', 'pop',
-        'popleft', 'remove', 'rotate'
-    ]))
+_mutable_spec: t.Tuple[t.Tuple[t.Type, t.FrozenSet[str]], ...] = (
+    (
+        abc.MutableSet,
+        frozenset(
+            [
+                "add",
+                "clear",
+                "difference_update",
+                "discard",
+                "pop",
+                "remove",
+                "symmetric_difference_update",
+                "update",
+            ]
+        ),
+    ),
+    (
+        abc.MutableMapping,
+        frozenset(["clear", "pop", "popitem", "setdefault", "update"]),
+    ),
+    (
+        abc.MutableSequence,
+        frozenset(["append", "reverse", "insert", "sort", "extend", "remove"]),
+    ),
+    (
+        deque,
+        frozenset(
+            [
+                "append",
+                "appendleft",
+                "clear",
+                "extend",
+                "extendleft",
+                "pop",
+                "popleft",
+                "remove",
+                "rotate",
+            ]
+        ),
+    ),
 )
 
 
-def safe_range(*args):
+def inspect_format_method(callable: t.Callable) -> t.Optional[str]:
+    if not isinstance(
+        callable, (types.MethodType, types.BuiltinMethodType)
+    ) or callable.__name__ not in ("format", "format_map"):
+        return None
+
+    obj = callable.__self__
+
+    if isinstance(obj, str):
+        return obj
+
+    return None
+
+
+def safe_range(*args: int) -> range:
     """A range that can't generate ranges with a length of more than
     MAX_RANGE items.
     """
     rng = range(*args)
+
     if len(rng) > MAX_RANGE:
-        raise OverflowError('range too big, maximum size for range is %d' %
-                            MAX_RANGE)
+        raise OverflowError(
+            "Range too big. The sandbox blocks ranges larger than"
+            f" MAX_RANGE ({MAX_RANGE})."
+        )
+
     return rng
 
 
-def unsafe(f):
+def unsafe(f: F) -> F:
     """Marks a function or method as unsafe.
 
-    ::
+    .. code-block: python
 
         @unsafe
         def delete(self):
             pass
     """
-    f.unsafe_callable = True
+    f.unsafe_callable = True  # type: ignore
     return f
 
 
-def is_internal_attribute(obj, attr):
+def is_internal_attribute(obj: t.Any, attr: str) -> bool:
     """Test if the attribute given is an internal python attribute.  For
     example this function returns `True` for the `func_code` attribute of
     python objects.  This is useful if the environment method
     :meth:`~SandboxedEnvironment.is_safe_attribute` is overridden.
 
     >>> from jinja2.sandbox import is_internal_attribute
-    >>> is_internal_attribute(lambda: None, "func_code")
-    True
-    >>> is_internal_attribute((lambda x:x).func_code, 'co_code')
+    >>> is_internal_attribute(str, "mro")
     True
     >>> is_internal_attribute(str, "upper")
     False
     """
-    if isinstance(obj, function_type):
+    if isinstance(obj, types.FunctionType):
         if attr in UNSAFE_FUNCTION_ATTRIBUTES:
             return True
-    elif isinstance(obj, method_type):
-        if attr in UNSAFE_FUNCTION_ATTRIBUTES or \
-           attr in UNSAFE_METHOD_ATTRIBUTES:
+    elif isinstance(obj, types.MethodType):
+        if attr in UNSAFE_FUNCTION_ATTRIBUTES or attr in UNSAFE_METHOD_ATTRIBUTES:
             return True
     elif isinstance(obj, type):
-        if attr == 'mro':
+        if attr == "mro":
             return True
-    elif isinstance(obj, (code_type, traceback_type, frame_type)):
+    elif isinstance(obj, (types.CodeType, types.TracebackType, types.FrameType)):
         return True
-    elif isinstance(obj, generator_type):
+    elif isinstance(obj, types.GeneratorType):
         if attr in UNSAFE_GENERATOR_ATTRIBUTES:
             return True
-    return attr.startswith('__')
+    elif hasattr(types, "CoroutineType") and isinstance(obj, types.CoroutineType):
+        if attr in UNSAFE_COROUTINE_ATTRIBUTES:
+            return True
+    elif hasattr(types, "AsyncGeneratorType") and isinstance(
+        obj, types.AsyncGeneratorType
+    ):
+        if attr in UNSAFE_ASYNC_GENERATOR_ATTRIBUTES:
+            return True
+    return attr.startswith("__")
 
 
-def modifies_known_mutable(obj, attr):
+def modifies_known_mutable(obj: t.Any, attr: str) -> bool:
     """This function checks if an attribute on a builtin mutable object
-    (list, dict, set or deque) would modify it if called.  It also supports
-    the "user"-versions of the objects (`sets.Set`, `UserDict.*` etc.) and
-    with Python 2.6 onwards the abstract base classes `MutableSet`,
-    `MutableMapping`, and `MutableSequence`.
+    (list, dict, set or deque) or the corresponding ABCs would modify it
+    if called.
 
     >>> modifies_known_mutable({}, "clear")
     True
@@ -165,8 +173,7 @@
     >>> modifies_known_mutable([], "index")
     False
 
-    If called with an unsupported object (such as unicode) `False` is
-    returned.
+    If called with an unsupported object, ``False`` is returned.
 
     >>> modifies_known_mutable("foo", "upper")
     False
@@ -184,30 +191,31 @@
     attributes or functions are safe to access.
 
     If the template tries to access insecure code a :exc:`SecurityError` is
-    raised.  However also other exceptions may occour during the rendering so
-    the caller has to ensure that all exceptions are catched.
+    raised.  However also other exceptions may occur during the rendering so
+    the caller has to ensure that all exceptions are caught.
     """
+
     sandboxed = True
 
     #: default callback table for the binary operators.  A copy of this is
     #: available on each instance of a sandboxed environment as
     #: :attr:`binop_table`
-    default_binop_table = {
-        '+':        operator.add,
-        '-':        operator.sub,
-        '*':        operator.mul,
-        '/':        operator.truediv,
-        '//':       operator.floordiv,
-        '**':       operator.pow,
-        '%':        operator.mod
+    default_binop_table: t.Dict[str, t.Callable[[t.Any, t.Any], t.Any]] = {
+        "+": operator.add,
+        "-": operator.sub,
+        "*": operator.mul,
+        "/": operator.truediv,
+        "//": operator.floordiv,
+        "**": operator.pow,
+        "%": operator.mod,
     }
 
     #: default callback table for the unary operators.  A copy of this is
     #: available on each instance of a sandboxed environment as
     #: :attr:`unop_table`
-    default_unop_table = {
-        '+':        operator.pos,
-        '-':        operator.neg
+    default_unop_table: t.Dict[str, t.Callable[[t.Any], t.Any]] = {
+        "+": operator.pos,
+        "-": operator.neg,
     }
 
     #: a set of binary operators that should be intercepted.  Each operator
@@ -224,7 +232,7 @@
     #: interested in.
     #:
     #: .. versionadded:: 2.6
-    intercepted_binops = frozenset()
+    intercepted_binops: t.FrozenSet[str] = frozenset()
 
     #: a set of unary operators that should be intercepted.  Each operator
     #: that is added to this set (empty by default) is delegated to the
@@ -239,51 +247,37 @@
     #: interested in.
     #:
     #: .. versionadded:: 2.6
-    intercepted_unops = frozenset()
+    intercepted_unops: t.FrozenSet[str] = frozenset()
 
-    def intercept_unop(self, operator):
-        """Called during template compilation with the name of a unary
-        operator to check if it should be intercepted at runtime.  If this
-        method returns `True`, :meth:`call_unop` is excuted for this unary
-        operator.  The default implementation of :meth:`call_unop` will use
-        the :attr:`unop_table` dictionary to perform the operator with the
-        same logic as the builtin one.
-
-        The following unary operators are interceptable: ``+`` and ``-``
-
-        Intercepted calls are always slower than the native operator call,
-        so make sure only to intercept the ones you are interested in.
-
-        .. versionadded:: 2.6
-        """
-        return False
-
-
-    def __init__(self, *args, **kwargs):
-        Environment.__init__(self, *args, **kwargs)
-        self.globals['range'] = safe_range
+    def __init__(self, *args: t.Any, **kwargs: t.Any) -> None:
+        super().__init__(*args, **kwargs)
+        self.globals["range"] = safe_range
         self.binop_table = self.default_binop_table.copy()
         self.unop_table = self.default_unop_table.copy()
 
-    def is_safe_attribute(self, obj, attr, value):
+    def is_safe_attribute(self, obj: t.Any, attr: str, value: t.Any) -> bool:
         """The sandboxed environment will call this method to check if the
         attribute of an object is safe to access.  Per default all attributes
         starting with an underscore are considered private as well as the
         special attributes of internal python objects as returned by the
         :func:`is_internal_attribute` function.
         """
-        return not (attr.startswith('_') or is_internal_attribute(obj, attr))
+        return not (attr.startswith("_") or is_internal_attribute(obj, attr))
 
-    def is_safe_callable(self, obj):
-        """Check if an object is safely callable.  Per default a function is
-        considered safe unless the `unsafe_callable` attribute exists and is
-        True.  Override this method to alter the behavior, but this won't
-        affect the `unsafe` decorator from this module.
+    def is_safe_callable(self, obj: t.Any) -> bool:
+        """Check if an object is safely callable. By default callables
+        are considered safe unless decorated with :func:`unsafe`.
+
+        This also recognizes the Django convention of setting
+        ``func.alters_data = True``.
         """
-        return not (getattr(obj, 'unsafe_callable', False) or
-                    getattr(obj, 'alters_data', False))
+        return not (
+            getattr(obj, "unsafe_callable", False) or getattr(obj, "alters_data", False)
+        )
 
-    def call_binop(self, context, operator, left, right):
+    def call_binop(
+        self, context: Context, operator: str, left: t.Any, right: t.Any
+    ) -> t.Any:
         """For intercepted binary operator calls (:meth:`intercepted_binops`)
         this function is executed instead of the builtin operator.  This can
         be used to fine tune the behavior of certain operators.
@@ -292,7 +286,7 @@
         """
         return self.binop_table[operator](left, right)
 
-    def call_unop(self, context, operator, arg):
+    def call_unop(self, context: Context, operator: str, arg: t.Any) -> t.Any:
         """For intercepted unary operator calls (:meth:`intercepted_unops`)
         this function is executed instead of the builtin operator.  This can
         be used to fine tune the behavior of certain operators.
@@ -301,12 +295,14 @@
         """
         return self.unop_table[operator](arg)
 
-    def getitem(self, obj, argument):
+    def getitem(
+        self, obj: t.Any, argument: t.Union[str, t.Any]
+    ) -> t.Union[t.Any, Undefined]:
         """Subscribe an object from sandboxed code."""
         try:
             return obj[argument]
         except (TypeError, LookupError):
-            if isinstance(argument, string_types):
+            if isinstance(argument, str):
                 try:
                     attr = str(argument)
                 except Exception:
@@ -322,7 +318,7 @@
                         return self.unsafe_undefined(obj, argument)
         return self.undefined(obj=obj, name=argument)
 
-    def getattr(self, obj, attribute):
+    def getattr(self, obj: t.Any, attribute: str) -> t.Union[t.Any, Undefined]:
         """Subscribe an object from sandboxed code and prefer the
         attribute.  The attribute passed *must* be a bytestring.
         """
@@ -339,20 +335,61 @@
             return self.unsafe_undefined(obj, attribute)
         return self.undefined(obj=obj, name=attribute)
 
-    def unsafe_undefined(self, obj, attribute):
+    def unsafe_undefined(self, obj: t.Any, attribute: str) -> Undefined:
         """Return an undefined object for unsafe attributes."""
-        return self.undefined('access to attribute %r of %r '
-                              'object is unsafe.' % (
-            attribute,
-            obj.__class__.__name__
-        ), name=attribute, obj=obj, exc=SecurityError)
+        return self.undefined(
+            f"access to attribute {attribute!r} of"
+            f" {type(obj).__name__!r} object is unsafe.",
+            name=attribute,
+            obj=obj,
+            exc=SecurityError,
+        )
 
-    def call(__self, __context, __obj, *args, **kwargs):
+    def format_string(
+        self,
+        s: str,
+        args: t.Tuple[t.Any, ...],
+        kwargs: t.Dict[str, t.Any],
+        format_func: t.Optional[t.Callable] = None,
+    ) -> str:
+        """If a format call is detected, then this is routed through this
+        method so that our safety sandbox can be used for it.
+        """
+        formatter: SandboxedFormatter
+        if isinstance(s, Markup):
+            formatter = SandboxedEscapeFormatter(self, escape=s.escape)
+        else:
+            formatter = SandboxedFormatter(self)
+
+        if format_func is not None and format_func.__name__ == "format_map":
+            if len(args) != 1 or kwargs:
+                raise TypeError(
+                    "format_map() takes exactly one argument"
+                    f" {len(args) + (kwargs is not None)} given"
+                )
+
+            kwargs = args[0]
+            args = ()
+
+        rv = formatter.vformat(s, args, kwargs)
+        return type(s)(rv)
+
+    def call(
+        __self,  # noqa: B902
+        __context: Context,
+        __obj: t.Any,
+        *args: t.Any,
+        **kwargs: t.Any,
+    ) -> t.Any:
         """Call an object from sandboxed code."""
+        fmt = inspect_format_method(__obj)
+        if fmt is not None:
+            return __self.format_string(fmt, args, kwargs, __obj)
+
         # the double prefixes are to avoid double keyword argument
         # errors when proxying the call.
         if not __self.is_safe_callable(__obj):
-            raise SecurityError('%r is not safely callable' % (__obj,))
+            raise SecurityError(f"{__obj!r} is not safely callable")
         return __context.call(__obj, *args, **kwargs)
 
 
@@ -362,7 +399,30 @@
     `dict` by using the :func:`modifies_known_mutable` function.
     """
 
-    def is_safe_attribute(self, obj, attr, value):
-        if not SandboxedEnvironment.is_safe_attribute(self, obj, attr, value):
+    def is_safe_attribute(self, obj: t.Any, attr: str, value: t.Any) -> bool:
+        if not super().is_safe_attribute(obj, attr, value):
             return False
+
         return not modifies_known_mutable(obj, attr)
+
+
+class SandboxedFormatter(Formatter):
+    def __init__(self, env: Environment, **kwargs: t.Any) -> None:
+        self._env = env
+        super().__init__(**kwargs)
+
+    def get_field(
+        self, field_name: str, args: t.Sequence[t.Any], kwargs: t.Mapping[str, t.Any]
+    ) -> t.Tuple[t.Any, str]:
+        first, rest = formatter_field_name_split(field_name)
+        obj = self.get_value(first, args, kwargs)
+        for is_attr, i in rest:
+            if is_attr:
+                obj = self._env.getattr(obj, i)
+            else:
+                obj = self._env.getitem(obj, i)
+        return obj, first
+
+
+class SandboxedEscapeFormatter(SandboxedFormatter, EscapeFormatter):
+    pass

tests.py

diff --git a/tests.py b/tests.py
index 48a3e06..a467cf0 100644
--- a/tests.py
+++ b/tests.py
@@ -1,41 +1,32 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.tests
-    ~~~~~~~~~~~~
+"""Built-in template tests used with the ``is`` operator."""
+import operator
+import typing as t
+from collections import abc
+from numbers import Number
 
-    Jinja test functions. Used with the "is" operator.
+from .runtime import Undefined
+from .utils import pass_environment
 
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import re
-from jinja2.runtime import Undefined
-from jinja2._compat import text_type, string_types, mapping_types
+if t.TYPE_CHECKING:
+    from .environment import Environment
 
 
-number_re = re.compile(r'^-?\d+(\.\d+)?$')
-regex_type = type(number_re)
-
-
-test_callable = callable
-
-
-def test_odd(value):
+def test_odd(value: int) -> bool:
     """Return true if the variable is odd."""
     return value % 2 == 1
 
 
-def test_even(value):
+def test_even(value: int) -> bool:
     """Return true if the variable is even."""
     return value % 2 == 0
 
 
-def test_divisibleby(value, num):
+def test_divisibleby(value: int, num: int) -> bool:
     """Check if a variable is divisible by a number."""
     return value % num == 0
 
 
-def test_defined(value):
+def test_defined(value: t.Any) -> bool:
     """Return true if the variable is defined:
 
     .. sourcecode:: jinja
@@ -52,57 +43,140 @@
     return not isinstance(value, Undefined)
 
 
-def test_undefined(value):
+def test_undefined(value: t.Any) -> bool:
     """Like :func:`defined` but the other way round."""
     return isinstance(value, Undefined)
 
 
-def test_none(value):
+@pass_environment
+def test_filter(env: "Environment", value: str) -> bool:
+    """Check if a filter exists by name. Useful if a filter may be
+    optionally available.
+
+    .. code-block:: jinja
+
+        {% if 'markdown' is filter %}
+            {{ value | markdown }}
+        {% else %}
+            {{ value }}
+        {% endif %}
+
+    .. versionadded:: 3.0
+    """
+    return value in env.filters
+
+
+@pass_environment
+def test_test(env: "Environment", value: str) -> bool:
+    """Check if a test exists by name. Useful if a test may be
+    optionally available.
+
+    .. code-block:: jinja
+
+        {% if 'loud' is test %}
+            {% if value is loud %}
+                {{ value|upper }}
+            {% else %}
+                {{ value|lower }}
+            {% endif %}
+        {% else %}
+            {{ value }}
+        {% endif %}
+
+    .. versionadded:: 3.0
+    """
+    return value in env.tests
+
+
+def test_none(value: t.Any) -> bool:
     """Return true if the variable is none."""
     return value is None
 
 
-def test_lower(value):
+def test_boolean(value: t.Any) -> bool:
+    """Return true if the object is a boolean value.
+
+    .. versionadded:: 2.11
+    """
+    return value is True or value is False
+
+
+def test_false(value: t.Any) -> bool:
+    """Return true if the object is False.
+
+    .. versionadded:: 2.11
+    """
+    return value is False
+
+
+def test_true(value: t.Any) -> bool:
+    """Return true if the object is True.
+
+    .. versionadded:: 2.11
+    """
+    return value is True
+
+
+# NOTE: The existing 'number' test matches booleans and floats
+def test_integer(value: t.Any) -> bool:
+    """Return true if the object is an integer.
+
+    .. versionadded:: 2.11
+    """
+    return isinstance(value, int) and value is not True and value is not False
+
+
+# NOTE: The existing 'number' test matches booleans and integers
+def test_float(value: t.Any) -> bool:
+    """Return true if the object is a float.
+
+    .. versionadded:: 2.11
+    """
+    return isinstance(value, float)
+
+
+def test_lower(value: str) -> bool:
     """Return true if the variable is lowercased."""
-    return text_type(value).islower()
+    return str(value).islower()
 
 
-def test_upper(value):
+def test_upper(value: str) -> bool:
     """Return true if the variable is uppercased."""
-    return text_type(value).isupper()
+    return str(value).isupper()
 
 
-def test_string(value):
+def test_string(value: t.Any) -> bool:
     """Return true if the object is a string."""
-    return isinstance(value, string_types)
+    return isinstance(value, str)
 
 
-def test_mapping(value):
+def test_mapping(value: t.Any) -> bool:
     """Return true if the object is a mapping (dict etc.).
 
     .. versionadded:: 2.6
     """
-    return isinstance(value, mapping_types)
+    return isinstance(value, abc.Mapping)
 
 
-def test_number(value):
+def test_number(value: t.Any) -> bool:
     """Return true if the variable is a number."""
-    return isinstance(value, (int, float, complex))
+    return isinstance(value, Number)
 
 
-def test_sequence(value):
+def test_sequence(value: t.Any) -> bool:
     """Return true if the variable is a sequence. Sequences are variables
     that are iterable.
     """
     try:
         len(value)
         value.__getitem__
-    except:
+    except Exception:
         return False
+
     return True
 
 
-def test_sameas(value, other):
+def test_sameas(value: t.Any, other: t.Any) -> bool:
     """Check if an object points to the same memory address than another
     object:
 
@@ -115,35 +189,67 @@
     return value is other
 
 
-def test_iterable(value):
+def test_iterable(value: t.Any) -> bool:
     """Check if it's possible to iterate over an object."""
     try:
         iter(value)
     except TypeError:
         return False
+
     return True
 
 
-def test_escaped(value):
+def test_escaped(value: t.Any) -> bool:
     """Check if the value is escaped."""
-    return hasattr(value, '__html__')
+    return hasattr(value, "__html__")
+
+
+def test_in(value: t.Any, seq: t.Container) -> bool:
+    """Check if value is in seq.
+
+    .. versionadded:: 2.10
+    """
+    return value in seq
 
 
 TESTS = {
-    'odd':              test_odd,
-    'even':             test_even,
-    'divisibleby':      test_divisibleby,
-    'defined':          test_defined,
-    'undefined':        test_undefined,
-    'none':             test_none,
-    'lower':            test_lower,
-    'upper':            test_upper,
-    'string':           test_string,
-    'mapping':          test_mapping,
-    'number':           test_number,
-    'sequence':         test_sequence,
-    'iterable':         test_iterable,
-    'callable':         test_callable,
-    'sameas':           test_sameas,
-    'escaped':          test_escaped
+    "odd": test_odd,
+    "even": test_even,
+    "divisibleby": test_divisibleby,
+    "defined": test_defined,
+    "undefined": test_undefined,
+    "filter": test_filter,
+    "test": test_test,
+    "none": test_none,
+    "boolean": test_boolean,
+    "false": test_false,
+    "true": test_true,
+    "integer": test_integer,
+    "float": test_float,
+    "lower": test_lower,
+    "upper": test_upper,
+    "string": test_string,
+    "mapping": test_mapping,
+    "number": test_number,
+    "sequence": test_sequence,
+    "iterable": test_iterable,
+    "callable": callable,
+    "sameas": test_sameas,
+    "escaped": test_escaped,
+    "in": test_in,
+    "==": operator.eq,
+    "eq": operator.eq,
+    "equalto": operator.eq,
+    "!=": operator.ne,
+    "ne": operator.ne,
+    ">": operator.gt,
+    "gt": operator.gt,
+    "greaterthan": operator.gt,
+    "ge": operator.ge,
+    ">=": operator.ge,
+    "<": operator.lt,
+    "lt": operator.lt,
+    "lessthan": operator.lt,
+    "<=": operator.le,
+    "le": operator.le,
 }

utils.py

diff --git a/utils.py b/utils.py
index ddc47da..9b5f5a5 100644
--- a/utils.py
+++ b/utils.py
@@ -1,88 +1,98 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.utils
-    ~~~~~~~~~~~~
-
-    Utility functions.
-
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
+import enum
+import json
+import os
 import re
-import errno
+import typing as t
+from collections import abc
 from collections import deque
-from jinja2._compat import text_type, string_types, implements_iterator, \
-     allocate_lock, url_quote
+from random import choice
+from random import randrange
+from threading import Lock
+from types import CodeType
+from urllib.parse import quote_from_bytes
 
+import markupsafe
 
-_word_split_re = re.compile(r'(\s+)')
-_punctuation_re = re.compile(
-    '^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$' % (
-        '|'.join(map(re.escape, ('(', '<', '&lt;'))),
-        '|'.join(map(re.escape, ('.', ',', ')', '>', '\n', '&gt;')))
-    )
-)
-_simple_email_re = re.compile(r'^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$')
-_striptags_re = re.compile(r'(<!--.*?-->|<[^>]*>)')
-_entity_re = re.compile(r'&([^;]+);')
-_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
-_digits = '0123456789'
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
 
 # special singleton representing missing values for the runtime
-missing = type('MissingType', (), {'__repr__': lambda x: 'missing'})()
+missing: t.Any = type("MissingType", (), {"__repr__": lambda x: "missing"})()
 
-# internal code
-internal_code = set()
+internal_code: t.MutableSet[CodeType] = set()
 
-concat = u''.join
+concat = "".join
 
 
-def contextfunction(f):
-    """This decorator can be used to mark a function or method context callable.
-    A context callable is passed the active :class:`Context` as first argument when
-    called from the template.  This is useful if a function wants to get access
-    to the context or functions provided on the context object.  For example
-    a function that returns a sorted list of template variables the current
-    template exports could look like this::
+def pass_context(f: F) -> F:
+    """Pass the :class:`~jinja2.runtime.Context` as the first argument
+    to the decorated function when called while rendering a template.
 
-        @contextfunction
-        def get_exported_names(context):
-            return sorted(context.exported_vars)
+    Can be used on functions, filters, and tests.
+
+    If only ``Context.eval_context`` is needed, use
+    :func:`pass_eval_context`. If only ``Context.environment`` is
+    needed, use :func:`pass_environment`.
+
+    .. versionadded:: 3.0.0
+        Replaces ``contextfunction`` and ``contextfilter``.
     """
-    f.contextfunction = True
+    f.jinja_pass_arg = _PassArg.context  # type: ignore
     return f
 
 
-def evalcontextfunction(f):
-    """This decorator can be used to mark a function or method as an eval
-    context callable.  This is similar to the :func:`contextfunction`
-    but instead of passing the context, an evaluation context object is
-    passed.  For more information about the eval context, see
-    :ref:`eval-context`.
+def pass_eval_context(f: F) -> F:
+    """Pass the :class:`~jinja2.nodes.EvalContext` as the first argument
+    to the decorated function when called while rendering a template.
+    See :ref:`eval-context`.
 
-    .. versionadded:: 2.4
+    Can be used on functions, filters, and tests.
+
+    If only ``EvalContext.environment`` is needed, use
+    :func:`pass_environment`.
+
+    .. versionadded:: 3.0.0
+        Replaces ``evalcontextfunction`` and ``evalcontextfilter``.
     """
-    f.evalcontextfunction = True
+    f.jinja_pass_arg = _PassArg.eval_context  # type: ignore
     return f
 
 
-def environmentfunction(f):
-    """This decorator can be used to mark a function or method as environment
-    callable.  This decorator works exactly like the :func:`contextfunction`
-    decorator just that the first argument is the active :class:`Environment`
-    and not context.
+def pass_environment(f: F) -> F:
+    """Pass the :class:`~jinja2.Environment` as the first argument to
+    the decorated function when called while rendering a template.
+
+    Can be used on functions, filters, and tests.
+
+    .. versionadded:: 3.0.0
+        Replaces ``environmentfunction`` and ``environmentfilter``.
     """
-    f.environmentfunction = True
+    f.jinja_pass_arg = _PassArg.environment  # type: ignore
     return f
 
 
-def internalcode(f):
+class _PassArg(enum.Enum):
+    context = enum.auto()
+    eval_context = enum.auto()
+    environment = enum.auto()
+
+    @classmethod
+    def from_obj(cls, obj: F) -> t.Optional["_PassArg"]:
+        if hasattr(obj, "jinja_pass_arg"):
+            return obj.jinja_pass_arg  # type: ignore
+
+        return None
+
+
+def internalcode(f: F) -> F:
     """Marks the function as internally used"""
     internal_code.add(f.__code__)
     return f
 
 
-def is_undefined(obj):
+def is_undefined(obj: t.Any) -> bool:
     """Check if the object passed is undefined.  This does nothing more than
     performing an instance check against :class:`Undefined` but looks nicer.
     This can be used for custom filters or tests that want to react to
@@ -94,29 +104,31 @@
                 return default
             return var
     """
-    from jinja2.runtime import Undefined
+    from .runtime import Undefined
+
     return isinstance(obj, Undefined)
 
 
-def consume(iterable):
+def consume(iterable: t.Iterable[t.Any]) -> None:
     """Consumes an iterable without doing anything with it."""
-    for event in iterable:
+    for _ in iterable:
         pass
 
 
-def clear_caches():
-    """Jinja2 keeps internal caches for environments and lexers.  These are
-    used so that Jinja2 doesn't have to recreate environments and lexers all
+def clear_caches() -> None:
+    """Jinja keeps internal caches for environments and lexers.  These are
+    used so that Jinja doesn't have to recreate environments and lexers all
     the time.  Normally you don't have to care about that but if you are
-    messuring memory consumption you may want to clean the caches.
+    measuring memory consumption you may want to clean the caches.
     """
-    from jinja2.environment import _spontaneous_environments
-    from jinja2.lexer import _lexer_cache
-    _spontaneous_environments.clear()
+    from .environment import get_spontaneous_environment
+    from .lexer import _lexer_cache
+
+    get_spontaneous_environment.cache_clear()
     _lexer_cache.clear()
 
 
-def import_string(import_name, silent=False):
+def import_string(import_name: str, silent: bool = False) -> t.Any:
     """Imports an object based on a string.  This is useful if you want to
     use import paths as endpoints or something similar.  An import path can
     be specified either in dotted notation (``xml.sax.saxutils.escape``)
@@ -128,12 +140,10 @@
     :return: imported object
     """
     try:
-        if ':' in import_name:
-            module, obj = import_name.split(':', 1)
-        elif '.' in import_name:
-            items = import_name.split('.')
-            module = '.'.join(items[:-1])
-            obj = items[-1]
+        if ":" in import_name:
+            module, obj = import_name.split(":", 1)
+        elif "." in import_name:
+            module, _, obj = import_name.rpartition(".")
         else:
             return __import__(import_name)
         return getattr(__import__(module, None, None, [obj]), obj)
@@ -142,95 +152,199 @@
             raise
 
 
-def open_if_exists(filename, mode='rb'):
+def open_if_exists(filename: str, mode: str = "rb") -> t.Optional[t.IO]:
     """Returns a file descriptor for the filename if that file exists,
-    otherwise `None`.
+    otherwise ``None``.
     """
-    try:
-        return open(filename, mode)
-    except IOError as e:
-        if e.errno not in (errno.ENOENT, errno.EISDIR):
-            raise
+    if not os.path.isfile(filename):
+        return None
+
+    return open(filename, mode)
 
 
-def object_type_repr(obj):
+def object_type_repr(obj: t.Any) -> str:
     """Returns the name of the object's type.  For some recognized
     singletons the name of the object is returned instead. (For
     example for `None` and `Ellipsis`).
     """
     if obj is None:
-        return 'None'
+        return "None"
     elif obj is Ellipsis:
-        return 'Ellipsis'
-    # __builtin__ in 2.x, builtins in 3.x
-    if obj.__class__.__module__ in ('__builtin__', 'builtins'):
-        name = obj.__class__.__name__
+        return "Ellipsis"
+
+    cls = type(obj)
+
+    if cls.__module__ == "builtins":
+        return f"{cls.__name__} object"
+
+    return f"{cls.__module__}.{cls.__name__} object"
+
+
+def pformat(obj: t.Any) -> str:
+    """Format an object using :func:`pprint.pformat`."""
+    from pprint import pformat  # type: ignore
+
+    return pformat(obj)
+
+
+_http_re = re.compile(
+    r"""
+    ^
+    (
+        (https?://|www\.)  # scheme or www
+        (([\w%-]+\.)+)?  # subdomain
+        (
+            [a-z]{2,63}  # basic tld
+        |
+            xn--[\w%]{2,59}  # idna tld
+        )
+    |
+        ([\w%-]{2,63}\.)+  # basic domain
+        (com|net|int|edu|gov|org|info|mil)  # basic tld
+    |
+        (https?://)  # scheme
+        (
+            (([\d]{1,3})(\.[\d]{1,3}){3})  # IPv4
+        |
+            (\[([\da-f]{0,4}:){2}([\da-f]{0,4}:?){1,6}])  # IPv6
+        )
+    )
+    (?::[\d]{1,5})?  # port
+    (?:[/?#]\S*)?  # path, query, and fragment
+    $
+    """,
+    re.IGNORECASE | re.VERBOSE,
+)
+_email_re = re.compile(r"^\S+@\w[\w.-]*\.\w+$")
+
+
+def urlize(
+    text: str,
+    trim_url_limit: t.Optional[int] = None,
+    rel: t.Optional[str] = None,
+    target: t.Optional[str] = None,
+    extra_schemes: t.Optional[t.Iterable[str]] = None,
+) -> str:
+    """Convert URLs in text into clickable links.
+
+    This may not recognize links in some situations. Usually, a more
+    comprehensive formatter, such as a Markdown library, is a better
+    choice.
+
+    Works on ``http://``, ``https://``, ``www.``, ``mailto:``, and email
+    addresses. Links with trailing punctuation (periods, commas, closing
+    parentheses) and leading punctuation (opening parentheses) are
+    recognized excluding the punctuation. Email addresses that include
+    header fields are not recognized (for example,
+    ``mailto:address@example.com?cc=copy@example.com``).
+
+    :param text: Original text containing URLs to link.
+    :param trim_url_limit: Shorten displayed URL values to this length.
+    :param target: Add the ``target`` attribute to links.
+    :param rel: Add the ``rel`` attribute to links.
+    :param extra_schemes: Recognize URLs that start with these schemes
+        in addition to the default behavior.
+
+    .. versionchanged:: 3.0
+        The ``extra_schemes`` parameter was added.
+
+    .. versionchanged:: 3.0
+        Generate ``https://`` links for URLs without a scheme.
+
+    .. versionchanged:: 3.0
+        The parsing rules were updated. Recognize email addresses with
+        or without the ``mailto:`` scheme. Validate IP addresses. Ignore
+        parentheses and brackets in more cases.
+    """
+    if trim_url_limit is not None:
+
+        def trim_url(x: str) -> str:
+            if len(x) > trim_url_limit:  # type: ignore
+                return f"{x[:trim_url_limit]}..."
+
+            return x
+
     else:
-        name = obj.__class__.__module__ + '.' + obj.__class__.__name__
-    return '%s object' % name
 
+        def trim_url(x: str) -> str:
+            return x
 
-def pformat(obj, verbose=False):
-    """Prettyprint an object.  Either use the `pretty` library or the
-    builtin `pprint`.
-    """
-    try:
-        from pretty import pretty
-        return pretty(obj, verbose=verbose)
-    except ImportError:
-        from pprint import pformat
-        return pformat(obj)
+    words = re.split(r"(\s+)", str(markupsafe.escape(text)))
+    rel_attr = f' rel="{markupsafe.escape(rel)}"' if rel else ""
+    target_attr = f' target="{markupsafe.escape(target)}"' if target else ""
 
-
-def urlize(text, trim_url_limit=None, nofollow=False):
-    """Converts any URLs in text into clickable links. Works on http://,
-    https:// and www. links. Links can have trailing punctuation (periods,
-    commas, close-parens) and leading punctuation (opening parens) and
-    it'll still do the right thing.
-
-    If trim_url_limit is not None, the URLs in link text will be limited
-    to trim_url_limit characters.
-
-    If nofollow is True, the URLs in link text will get a rel="nofollow"
-    attribute.
-    """
-    trim_url = lambda x, limit=trim_url_limit: limit is not None \
-                         and (x[:limit] + (len(x) >=limit and '...'
-                         or '')) or x
-    words = _word_split_re.split(text_type(escape(text)))
-    nofollow_attr = nofollow and ' rel="nofollow"' or ''
     for i, word in enumerate(words):
-        match = _punctuation_re.match(word)
+        head, middle, tail = "", word, ""
+        match = re.match(r"^([(<]|&lt;)+", middle)
+
         if match:
-            lead, middle, trail = match.groups()
-            if middle.startswith('www.') or (
-                '@' not in middle and
-                not middle.startswith('http://') and
-                not middle.startswith('https://') and
-                len(middle) > 0 and
-                middle[0] in _letters + _digits and (
-                    middle.endswith('.org') or
-                    middle.endswith('.net') or
-                    middle.endswith('.com')
-                )):
-                middle = '<a href="http://%s"%s>%s</a>' % (middle,
-                    nofollow_attr, trim_url(middle))
-            if middle.startswith('http://') or \
-               middle.startswith('https://'):
-                middle = '<a href="%s"%s>%s</a>' % (middle,
-                    nofollow_attr, trim_url(middle))
-            if '@' in middle and not middle.startswith('www.') and \
-               not ':' in middle and _simple_email_re.match(middle):
-                middle = '<a href="mailto:%s">%s</a>' % (middle, middle)
-            if lead + middle + trail != word:
-                words[i] = lead + middle + trail
-    return u''.join(words)
+            head = match.group()
+            middle = middle[match.end() :]
+
+        # Unlike lead, which is anchored to the start of the string,
+        # need to check that the string ends with any of the characters
+        # before trying to match all of them, to avoid backtracking.
+        if middle.endswith((")", ">", ".", ",", "\n", "&gt;")):
+            match = re.search(r"([)>.,\n]|&gt;)+$", middle)
+
+            if match:
+                tail = match.group()
+                middle = middle[: match.start()]
+
+        # Prefer balancing parentheses in URLs instead of ignoring a
+        # trailing character.
+        for start_char, end_char in ("(", ")"), ("<", ">"), ("&lt;", "&gt;"):
+            start_count = middle.count(start_char)
+
+            if start_count <= middle.count(end_char):
+                # Balanced, or lighter on the left
+                continue
+
+            # Move as many as possible from the tail to balance
+            for _ in range(min(start_count, tail.count(end_char))):
+                end_index = tail.index(end_char) + len(end_char)
+                # Move anything in the tail before the end char too
+                middle += tail[:end_index]
+                tail = tail[end_index:]
+
+        if _http_re.match(middle):
+            if middle.startswith("https://") or middle.startswith("http://"):
+                middle = (
+                    f'<a href="{middle}"{rel_attr}{target_attr}>{trim_url(middle)}</a>'
+                )
+            else:
+                middle = (
+                    f'<a href="https://{middle}"{rel_attr}{target_attr}>'
+                    f"{trim_url(middle)}</a>"
+                )
+
+        elif middle.startswith("mailto:") and _email_re.match(middle[7:]):
+            middle = f'<a href="{middle}">{middle[7:]}</a>'
+
+        elif (
+            "@" in middle
+            and not middle.startswith("www.")
+            and ":" not in middle
+            and _email_re.match(middle)
+        ):
+            middle = f'<a href="mailto:{middle}">{middle}</a>'
+
+        elif extra_schemes is not None:
+            for scheme in extra_schemes:
+                if middle != scheme and middle.startswith(scheme):
+                    middle = f'<a href="{middle}"{rel_attr}{target_attr}>{middle}</a>'
+
+        words[i] = f"{head}{middle}{tail}"
+
+    return "".join(words)
 
 
-def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
-    """Generate some lorem impsum for the template."""
-    from jinja2.constants import LOREM_IPSUM_WORDS
-    from random import choice, randrange
+def generate_lorem_ipsum(
+    n: int = 5, html: bool = True, min: int = 20, max: int = 100
+) -> str:
+    """Generate some lorem ipsum for the template."""
+    from .constants import LOREM_IPSUM_WORDS
+
     words = LOREM_IPSUM_WORDS.split()
     result = []
 
@@ -255,137 +369,140 @@
             if idx - randrange(3, 8) > last_comma:
                 last_comma = idx
                 last_fullstop += 2
-                word += ','
+                word += ","
             # add end of sentences
             if idx - randrange(10, 20) > last_fullstop:
                 last_comma = last_fullstop = idx
-                word += '.'
+                word += "."
                 next_capitalized = True
             p.append(word)
 
         # ensure that the paragraph ends with a dot.
-        p = u' '.join(p)
-        if p.endswith(','):
-            p = p[:-1] + '.'
-        elif not p.endswith('.'):
-            p += '.'
-        result.append(p)
+        p_str = " ".join(p)
+
+        if p_str.endswith(","):
+            p_str = p_str[:-1] + "."
+        elif not p_str.endswith("."):
+            p_str += "."
+
+        result.append(p_str)
 
     if not html:
-        return u'\n\n'.join(result)
-    return Markup(u'\n'.join(u'<p>%s</p>' % escape(x) for x in result))
+        return "\n\n".join(result)
+    return markupsafe.Markup(
+        "\n".join(f"<p>{markupsafe.escape(x)}</p>" for x in result)
+    )
 
 
-def unicode_urlencode(obj, charset='utf-8'):
-    """URL escapes a single bytestring or unicode string with the
-    given charset if applicable to URL safe quoting under all rules
-    that need to be considered under all supported Python versions.
+def url_quote(obj: t.Any, charset: str = "utf-8", for_qs: bool = False) -> str:
+    """Quote a string for use in a URL using the given charset.
 
-    If non strings are provided they are converted to their unicode
-    representation first.
+    :param obj: String or bytes to quote. Other types are converted to
+        string then encoded to bytes using the given charset.
+    :param charset: Encode text to bytes using this charset.
+    :param for_qs: Quote "/" and use "+" for spaces.
     """
-    if not isinstance(obj, string_types):
-        obj = text_type(obj)
-    if isinstance(obj, text_type):
+    if not isinstance(obj, bytes):
+        if not isinstance(obj, str):
+            obj = str(obj)
+
         obj = obj.encode(charset)
-    return text_type(url_quote(obj))
+
+    safe = b"" if for_qs else b"/"
+    rv = quote_from_bytes(obj, safe)
+
+    if for_qs:
+        rv = rv.replace("%20", "+")
+
+    return rv
 
 
-class LRUCache(object):
+@abc.MutableMapping.register
+class LRUCache:
     """A simple LRU Cache implementation."""
 
     # this is fast for small capacities (something below 1000) but doesn't
     # scale.  But as long as it's only used as storage for templates this
     # won't do any harm.
 
-    def __init__(self, capacity):
+    def __init__(self, capacity: int) -> None:
         self.capacity = capacity
-        self._mapping = {}
-        self._queue = deque()
+        self._mapping: t.Dict[t.Any, t.Any] = {}
+        self._queue: "te.Deque[t.Any]" = deque()
         self._postinit()
 
-    def _postinit(self):
+    def _postinit(self) -> None:
         # alias all queue methods for faster lookup
         self._popleft = self._queue.popleft
         self._pop = self._queue.pop
         self._remove = self._queue.remove
-        self._wlock = allocate_lock()
+        self._wlock = Lock()
         self._append = self._queue.append
 
-    def __getstate__(self):
+    def __getstate__(self) -> t.Mapping[str, t.Any]:
         return {
-            'capacity':     self.capacity,
-            '_mapping':     self._mapping,
-            '_queue':       self._queue
+            "capacity": self.capacity,
+            "_mapping": self._mapping,
+            "_queue": self._queue,
         }
 
-    def __setstate__(self, d):
+    def __setstate__(self, d: t.Mapping[str, t.Any]) -> None:
         self.__dict__.update(d)
         self._postinit()
 
-    def __getnewargs__(self):
+    def __getnewargs__(self) -> t.Tuple:
         return (self.capacity,)
 
-    def copy(self):
+    def copy(self) -> "LRUCache":
         """Return a shallow copy of the instance."""
         rv = self.__class__(self.capacity)
         rv._mapping.update(self._mapping)
-        rv._queue = deque(self._queue)
+        rv._queue.extend(self._queue)
         return rv
 
-    def get(self, key, default=None):
+    def get(self, key: t.Any, default: t.Any = None) -> t.Any:
         """Return an item from the cache dict or `default`"""
         try:
             return self[key]
         except KeyError:
             return default
 
-    def setdefault(self, key, default=None):
+    def setdefault(self, key: t.Any, default: t.Any = None) -> t.Any:
         """Set `default` if the key is not in the cache otherwise
         leave unchanged. Return the value of this key.
         """
-        self._wlock.acquire()
         try:
-            try:
-                return self[key]
-            except KeyError:
-                self[key] = default
-                return default
-        finally:
-            self._wlock.release()
+            return self[key]
+        except KeyError:
+            self[key] = default
+            return default
 
-    def clear(self):
+    def clear(self) -> None:
         """Clear the cache."""
-        self._wlock.acquire()
-        try:
+        with self._wlock:
             self._mapping.clear()
             self._queue.clear()
-        finally:
-            self._wlock.release()
 
-    def __contains__(self, key):
+    def __contains__(self, key: t.Any) -> bool:
         """Check if a key exists in this cache."""
         return key in self._mapping
 
-    def __len__(self):
+    def __len__(self) -> int:
         """Return the current size of the cache."""
         return len(self._mapping)
 
-    def __repr__(self):
-        return '<%s %r>' % (
-            self.__class__.__name__,
-            self._mapping
-        )
+    def __repr__(self) -> str:
+        return f"<{type(self).__name__} {self._mapping!r}>"
 
-    def __getitem__(self, key):
+    def __getitem__(self, key: t.Any) -> t.Any:
         """Get an item from the cache. Moves the item up so that it has the
         highest priority then.
 
         Raise a `KeyError` if it does not exist.
         """
-        self._wlock.acquire()
-        try:
+        with self._wlock:
             rv = self._mapping[key]
+
             if self._queue[-1] != key:
                 try:
                     self._remove(key)
@@ -394,73 +511,55 @@
                     # when we read, ignore the ValueError that we would
                     # get otherwise.
                     pass
-                self._append(key)
-            return rv
-        finally:
-            self._wlock.release()
 
-    def __setitem__(self, key, value):
+                self._append(key)
+
+            return rv
+
+    def __setitem__(self, key: t.Any, value: t.Any) -> None:
         """Sets the value for an item. Moves the item up so that it
         has the highest priority then.
         """
-        self._wlock.acquire()
-        try:
+        with self._wlock:
             if key in self._mapping:
                 self._remove(key)
             elif len(self._mapping) == self.capacity:
                 del self._mapping[self._popleft()]
+
             self._append(key)
             self._mapping[key] = value
-        finally:
-            self._wlock.release()
 
-    def __delitem__(self, key):
+    def __delitem__(self, key: t.Any) -> None:
         """Remove an item from the cache dict.
         Raise a `KeyError` if it does not exist.
         """
-        self._wlock.acquire()
-        try:
+        with self._wlock:
             del self._mapping[key]
+
             try:
                 self._remove(key)
             except ValueError:
-                # __getitem__ is not locked, it might happen
                 pass
-        finally:
-            self._wlock.release()
 
-    def items(self):
+    def items(self) -> t.Iterable[t.Tuple[t.Any, t.Any]]:
         """Return a list of items."""
         result = [(key, self._mapping[key]) for key in list(self._queue)]
         result.reverse()
         return result
 
-    def iteritems(self):
-        """Iterate over all items."""
-        return iter(self.items())
-
-    def values(self):
+    def values(self) -> t.Iterable[t.Any]:
         """Return a list of all values."""
         return [x[1] for x in self.items()]
 
-    def itervalue(self):
-        """Iterate over all values."""
-        return iter(self.values())
-
-    def keys(self):
+    def keys(self) -> t.Iterable[t.Any]:
         """Return a list of all keys ordered by most recent usage."""
         return list(self)
 
-    def iterkeys(self):
-        """Iterate over all keys in the cache dict, ordered by
-        the most recent usage.
-        """
+    def __iter__(self) -> t.Iterator[t.Any]:
         return reversed(tuple(self._queue))
 
-    __iter__ = iterkeys
-
-    def __reversed__(self):
-        """Iterate over the values in the cache dict, oldest items
+    def __reversed__(self) -> t.Iterator[t.Any]:
+        """Iterate over the keys in the cache dict, oldest items
         coming first.
         """
         return iter(tuple(self._queue))
@@ -468,53 +567,189 @@
     __copy__ = copy
 
 
-# register the LRU cache as mutable mapping if possible
-try:
-    from collections import MutableMapping
-    MutableMapping.register(LRUCache)
-except ImportError:
-    pass
+def select_autoescape(
+    enabled_extensions: t.Collection[str] = ("html", "htm", "xml"),
+    disabled_extensions: t.Collection[str] = (),
+    default_for_string: bool = True,
+    default: bool = False,
+) -> t.Callable[[t.Optional[str]], bool]:
+    """Intelligently sets the initial value of autoescaping based on the
+    filename of the template.  This is the recommended way to configure
+    autoescaping if you do not want to write a custom function yourself.
+
+    If you want to enable it for all templates created from strings or
+    for all templates with `.html` and `.xml` extensions::
+
+        from jinja2 import Environment, select_autoescape
+        env = Environment(autoescape=select_autoescape(
+            enabled_extensions=('html', 'xml'),
+            default_for_string=True,
+        ))
+
+    Example configuration to turn it on at all times except if the template
+    ends with `.txt`::
+
+        from jinja2 import Environment, select_autoescape
+        env = Environment(autoescape=select_autoescape(
+            disabled_extensions=('txt',),
+            default_for_string=True,
+            default=True,
+        ))
+
+    The `enabled_extensions` is an iterable of all the extensions that
+    autoescaping should be enabled for.  Likewise `disabled_extensions` is
+    a list of all templates it should be disabled for.  If a template is
+    loaded from a string then the default from `default_for_string` is used.
+    If nothing matches then the initial value of autoescaping is set to the
+    value of `default`.
+
+    For security reasons this function operates case insensitive.
+
+    .. versionadded:: 2.9
+    """
+    enabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in enabled_extensions)
+    disabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in disabled_extensions)
+
+    def autoescape(template_name: t.Optional[str]) -> bool:
+        if template_name is None:
+            return default_for_string
+        template_name = template_name.lower()
+        if template_name.endswith(enabled_patterns):
+            return True
+        if template_name.endswith(disabled_patterns):
+            return False
+        return default
+
+    return autoescape
 
 
-@implements_iterator
-class Cycler(object):
-    """A cycle helper for templates."""
+def htmlsafe_json_dumps(
+    obj: t.Any, dumps: t.Optional[t.Callable[..., str]] = None, **kwargs: t.Any
+) -> markupsafe.Markup:
+    """Serialize an object to a string of JSON with :func:`json.dumps`,
+    then replace HTML-unsafe characters with Unicode escapes and mark
+    the result safe with :class:`~markupsafe.Markup`.
 
-    def __init__(self, *items):
+    This is available in templates as the ``|tojson`` filter.
+
+    The following characters are escaped: ``<``, ``>``, ``&``, ``'``.
+
+    The returned string is safe to render in HTML documents and
+    ``<script>`` tags. The exception is in HTML attributes that are
+    double quoted; either use single quotes or the ``|forceescape``
+    filter.
+
+    :param obj: The object to serialize to JSON.
+    :param dumps: The ``dumps`` function to use. Defaults to
+        ``env.policies["json.dumps_function"]``, which defaults to
+        :func:`json.dumps`.
+    :param kwargs: Extra arguments to pass to ``dumps``. Merged onto
+        ``env.policies["json.dumps_kwargs"]``.
+
+    .. versionchanged:: 3.0
+        The ``dumper`` parameter is renamed to ``dumps``.
+
+    .. versionadded:: 2.9
+    """
+    if dumps is None:
+        dumps = json.dumps
+
+    return markupsafe.Markup(
+        dumps(obj, **kwargs)
+        .replace("<", "\\u003c")
+        .replace(">", "\\u003e")
+        .replace("&", "\\u0026")
+        .replace("'", "\\u0027")
+    )
+
+
+class Cycler:
+    """Cycle through values by yield them one at a time, then restarting
+    once the end is reached. Available as ``cycler`` in templates.
+
+    Similar to ``loop.cycle``, but can be used outside loops or across
+    multiple loops. For example, render a list of folders and files in a
+    list, alternating giving them "odd" and "even" classes.
+
+    .. code-block:: html+jinja
+
+        {% set row_class = cycler("odd", "even") %}
+        <ul class="browser">
+        {% for folder in folders %}
+          <li class="folder {{ row_class.next() }}">{{ folder }}
+        {% endfor %}
+        {% for file in files %}
+          <li class="file {{ row_class.next() }}">{{ file }}
+        {% endfor %}
+        </ul>
+
+    :param items: Each positional argument will be yielded in the order
+        given for each cycle.
+
+    .. versionadded:: 2.1
+    """
+
+    def __init__(self, *items: t.Any) -> None:
         if not items:
-            raise RuntimeError('at least one item has to be provided')
+            raise RuntimeError("at least one item has to be provided")
         self.items = items
-        self.reset()
+        self.pos = 0
 
-    def reset(self):
-        """Resets the cycle."""
+    def reset(self) -> None:
+        """Resets the current item to the first item."""
         self.pos = 0
 
     @property
-    def current(self):
-        """Returns the current item."""
+    def current(self) -> t.Any:
+        """Return the current item. Equivalent to the item that will be
+        returned next time :meth:`next` is called.
+        """
         return self.items[self.pos]
 
-    def __next__(self):
-        """Goes one item ahead and returns it."""
+    def next(self) -> t.Any:
+        """Return the current item, then advance :attr:`current` to the
+        next item.
+        """
         rv = self.current
         self.pos = (self.pos + 1) % len(self.items)
         return rv
 
+    __next__ = next
 
-class Joiner(object):
+
+class Joiner:
     """A joining helper for templates."""
 
-    def __init__(self, sep=u', '):
+    def __init__(self, sep: str = ", ") -> None:
         self.sep = sep
         self.used = False
 
-    def __call__(self):
+    def __call__(self) -> str:
         if not self.used:
             self.used = True
-            return u''
+            return ""
         return self.sep
 
 
-# Imported here because that's where it was in the past
-from markupsafe import Markup, escape, soft_unicode
+class Namespace:
+    """A namespace object that can hold arbitrary attributes.  It may be
+    initialized from a dictionary or with keyword arguments."""
+
+    def __init__(*args: t.Any, **kwargs: t.Any) -> None:  # noqa: B902
+        self, args = args[0], args[1:]
+        self.__attrs = dict(*args, **kwargs)
+
+    def __getattribute__(self, name: str) -> t.Any:
+        # __class__ is needed for the awaitable check in async mode
+        if name in {"_Namespace__attrs", "__class__"}:
+            return object.__getattribute__(self, name)
+        try:
+            return self.__attrs[name]
+        except KeyError:
+            raise AttributeError(name) from None
+
+    def __setitem__(self, name: str, value: t.Any) -> None:
+        self.__attrs[name] = value
+
+    def __repr__(self) -> str:
+        return f"<Namespace {self.__attrs!r}>"

visitor.py

diff --git a/visitor.py b/visitor.py
index 413e7c3..17c6aab 100644
--- a/visitor.py
+++ b/visitor.py
@@ -1,17 +1,19 @@
-# -*- coding: utf-8 -*-
+"""API for traversing the AST nodes. Implemented by the compiler and
+meta introspection.
 """
-    jinja2.visitor
-    ~~~~~~~~~~~~~~
+import typing as t
 
-    This module implements a visitor for the nodes.
+from .nodes import Node
 
-    :copyright: (c) 2010 by the Jinja Team.
-    :license: BSD.
-"""
-from jinja2.nodes import Node
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+
+    class VisitCallable(te.Protocol):
+        def __call__(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.Any:
+            ...
 
 
-class NodeVisitor(object):
+class NodeVisitor:
     """Walks the abstract syntax tree and call visitor functions for every
     node found.  The visitor functions may return values which will be
     forwarded by the `visit` method.
@@ -23,25 +25,26 @@
     (return value `None`) the `generic_visit` visitor is used instead.
     """
 
-    def get_visitor(self, node):
+    def get_visitor(self, node: Node) -> "t.Optional[VisitCallable]":
         """Return the visitor function for this node or `None` if no visitor
         exists for this node.  In that case the generic visit function is
         used instead.
         """
-        method = 'visit_' + node.__class__.__name__
-        return getattr(self, method, None)
+        return getattr(self, f"visit_{type(node).__name__}", None)
 
-    def visit(self, node, *args, **kwargs):
+    def visit(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.Any:
         """Visit a node."""
         f = self.get_visitor(node)
+
         if f is not None:
             return f(node, *args, **kwargs)
+
         return self.generic_visit(node, *args, **kwargs)
 
-    def generic_visit(self, node, *args, **kwargs):
+    def generic_visit(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.Any:
         """Called if no explicit visitor function exists for a node."""
-        for node in node.iter_child_nodes():
-            self.visit(node, *args, **kwargs)
+        for child_node in node.iter_child_nodes():
+            self.visit(child_node, *args, **kwargs)
 
 
 class NodeTransformer(NodeVisitor):
@@ -55,7 +58,7 @@
     replacement takes place.
     """
 
-    def generic_visit(self, node, *args, **kwargs):
+    def generic_visit(self, node: Node, *args: t.Any, **kwargs: t.Any) -> Node:
         for field, old_value in node.iter_fields():
             if isinstance(old_value, list):
                 new_values = []
@@ -77,11 +80,13 @@
                     setattr(node, field, new_node)
         return node
 
-    def visit_list(self, node, *args, **kwargs):
+    def visit_list(self, node: Node, *args: t.Any, **kwargs: t.Any) -> t.List[Node]:
         """As transformers may return lists in some places this method
         can be used to enforce a list as return value.
         """
         rv = self.visit(node, *args, **kwargs)
+
         if not isinstance(rv, list):
-            rv = [rv]
+            return [rv]
+
         return rv