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# Copyright 2019 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Emboss C++ code generator.
This is a driver program that reads IR, feeds it to header_generator, and prints
the result.
"""
from __future__ import print_function
import argparse
import os
import sys
from compiler.back_end.cpp import header_generator
from compiler.util import error
from compiler.util import ir_data
def _parse_command_line(argv):
"""Parses the given command-line arguments."""
parser = argparse.ArgumentParser(description="Emboss compiler C++ back end.",
prog=argv[0])
parser.add_argument("--input-file",
type=str,
help=".emb.ir file to compile.")
parser.add_argument("--output-file",
type=str,
help="Write header to file. If not specified, write " +
"header to stdout.")
parser.add_argument("--color-output",
default="if_tty",
choices=["always", "never", "if_tty", "auto"],
help="Print error messages using color. 'auto' is a "
"synonym for 'if_tty'.")
parser.add_argument("--cc-enum-traits",
action=argparse.BooleanOptionalAction,
default=True,
help="""Controls generation of EnumTraits by the C++
backend""")
return parser.parse_args(argv[1:])
def _show_errors(errors, ir, color_output):
"""Prints errors with source code snippets."""
source_codes = {}
for module in ir.module:
source_codes[module.source_file_name] = module.source_text
use_color = (color_output == "always" or
(color_output in ("auto", "if_tty") and
os.isatty(sys.stderr.fileno())))
print(error.format_errors(errors, source_codes, use_color), file=sys.stderr)
def generate_headers_and_log_errors(ir, color_output, config: header_generator.Config):
"""Generates a C++ header and logs any errors.
Arguments:
ir: EmbossIr of the module.
color_output: "always", "never", "if_tty", "auto"
config: Header generation configuration.
Returns:
A tuple of (header, errors)
"""
header, errors = header_generator.generate_header(ir, config)
if errors:
_show_errors(errors, ir, color_output)
return (header, errors)
def main(flags):
if flags.input_file:
with open(flags.input_file) as f:
ir = ir_data.EmbossIr.from_json(f.read())
else:
ir = ir_data.EmbossIr.from_json(sys.stdin.read())
config = header_generator.Config(include_enum_traits=flags.cc_enum_traits)
header, errors = generate_headers_and_log_errors(ir, flags.color_output, config)
if errors:
return 1
if flags.output_file:
with open(flags.output_file, "w") as f:
f.write(header)
else:
print(header)
return 0
if __name__ == '__main__':
sys.exit(main(_parse_command_line(sys.argv)))