| # Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
| # For details: https://github.com/PyCQA/pylint/blob/main/LICENSE |
| |
| import re |
| from collections import namedtuple |
| from typing import Generator, List |
| |
| # Allow stopping after the first semicolon/hash encountered, |
| # so that an option can be continued with the reasons |
| # why it is active or disabled. |
| OPTION_RGX = r""" |
| \s* # Any number of whithespace |
| \#? # One or zero hash |
| .* # Anything (as much as possible) |
| (\s* # Beginning of first matched group and any number of whitespaces |
| \# # Beginning of comment |
| .*? # Anything (as little as possible) |
| \bpylint: # pylint word and column |
| \s* # Any number of whitespaces |
| ([^;#\n]+)) # Anything except semicolon or hash or newline (it is the second matched group) |
| # and end of the first matched group |
| [;#]{0,1}""" # From 0 to 1 repetition of semicolon or hash |
| OPTION_PO = re.compile(OPTION_RGX, re.VERBOSE) |
| |
| |
| PragmaRepresenter = namedtuple("PragmaRepresenter", "action messages") |
| |
| |
| ATOMIC_KEYWORDS = frozenset(("disable-all", "skip-file")) |
| MESSAGE_KEYWORDS = frozenset(("disable-msg", "enable-msg", "disable", "enable")) |
| # sorted is necessary because sets are unordered collections and ALL_KEYWORDS |
| # string should not vary between executions |
| # reverse is necessary in order to have the longest keywords first, so that, for example, |
| # 'disable' string should not be matched instead of 'disable-all' |
| ALL_KEYWORDS = "|".join( |
| sorted(ATOMIC_KEYWORDS | MESSAGE_KEYWORDS, key=len, reverse=True) |
| ) |
| |
| |
| TOKEN_SPECIFICATION = [ |
| ("KEYWORD", fr"\b({ALL_KEYWORDS:s})\b"), |
| ("MESSAGE_STRING", r"[0-9A-Za-z\-\_]{2,}"), # Identifiers |
| ("ASSIGN", r"="), # Assignment operator |
| ("MESSAGE_NUMBER", r"[CREIWF]{1}\d*"), |
| ] |
| |
| TOK_REGEX = "|".join( |
| f"(?P<{token_name:s}>{token_rgx:s})" |
| for token_name, token_rgx in TOKEN_SPECIFICATION |
| ) |
| |
| |
| def emit_pragma_representer(action, messages): |
| if not messages and action in MESSAGE_KEYWORDS: |
| raise InvalidPragmaError( |
| "The keyword is not followed by message identifier", action |
| ) |
| return PragmaRepresenter(action, messages) |
| |
| |
| class PragmaParserError(Exception): |
| """ |
| A class for exceptions thrown by pragma_parser module |
| """ |
| |
| def __init__(self, message, token): |
| """ |
| :args message: explain the reason why the exception has been thrown |
| :args token: token concerned by the exception |
| """ |
| self.message = message |
| self.token = token |
| super().__init__(self.message) |
| |
| |
| class UnRecognizedOptionError(PragmaParserError): |
| """ |
| Thrown in case the of a valid but unrecognized option |
| """ |
| |
| |
| class InvalidPragmaError(PragmaParserError): |
| """ |
| Thrown in case the pragma is invalid |
| """ |
| |
| |
| def parse_pragma(pylint_pragma: str) -> Generator[PragmaRepresenter, None, None]: |
| action = None |
| messages: List[str] = [] |
| assignment_required = False |
| previous_token = "" |
| |
| for mo in re.finditer(TOK_REGEX, pylint_pragma): |
| kind = mo.lastgroup |
| value = mo.group() |
| |
| if kind == "ASSIGN": |
| if not assignment_required: |
| if action: |
| # A keyword has been found previously but doesn't support assignement |
| raise UnRecognizedOptionError( |
| "The keyword doesn't support assignment", action |
| ) |
| if previous_token: |
| # Something found previously but not a known keyword |
| raise UnRecognizedOptionError( |
| "The keyword is unknown", previous_token |
| ) |
| # Nothing at all detected before this assignment |
| raise InvalidPragmaError("Missing keyword before assignment", "") |
| assignment_required = False |
| elif assignment_required: |
| raise InvalidPragmaError("The = sign is missing after the keyword", action) |
| elif kind == "KEYWORD": |
| if action: |
| yield emit_pragma_representer(action, messages) |
| action = value |
| messages = list() |
| assignment_required = action in MESSAGE_KEYWORDS |
| elif kind in ("MESSAGE_STRING", "MESSAGE_NUMBER"): |
| messages.append(value) |
| assignment_required = False |
| else: |
| raise RuntimeError("Token not recognized") |
| |
| previous_token = value |
| |
| if action: |
| yield emit_pragma_representer(action, messages) |
| else: |
| raise UnRecognizedOptionError("The keyword is unknown", previous_token) |