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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
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# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt
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"""Check source code is ascii only or has an encoding declaration (PEP 263)."""
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from __future__ import annotations
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import re
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import tokenize
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from typing import TYPE_CHECKING
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from astroid import nodes
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from pylint.checkers import BaseRawFileChecker, BaseTokenChecker
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from pylint.typing import ManagedMessage
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if TYPE_CHECKING:
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from pylint.lint import PyLinter
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class ByIdManagedMessagesChecker(BaseRawFileChecker):
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"""Checks for messages that are enabled or disabled by id instead of symbol."""
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name = "miscellaneous"
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msgs = {
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"I0023": (
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"%s",
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"use-symbolic-message-instead",
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"Used when a message is enabled or disabled by id.",
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)
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}
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options = ()
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def _clear_by_id_managed_msgs(self) -> None:
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self.linter._by_id_managed_msgs.clear()
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def _get_by_id_managed_msgs(self) -> list[ManagedMessage]:
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return self.linter._by_id_managed_msgs
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def process_module(self, node: nodes.Module) -> None:
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"""Inspect the source file to find messages activated or deactivated by id."""
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managed_msgs = self._get_by_id_managed_msgs()
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for (mod_name, msgid, symbol, lineno, is_disabled) in managed_msgs:
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if mod_name == node.name:
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verb = "disable" if is_disabled else "enable"
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txt = f"'{msgid}' is cryptic: use '# pylint: {verb}={symbol}' instead"
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self.add_message("use-symbolic-message-instead", line=lineno, args=txt)
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self._clear_by_id_managed_msgs()
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class EncodingChecker(BaseTokenChecker, BaseRawFileChecker):
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"""BaseChecker for encoding issues.
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Checks for:
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* warning notes in the code like FIXME, XXX
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* encoding issues.
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"""
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# configuration section name
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name = "miscellaneous"
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msgs = {
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"W0511": (
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"%s",
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"fixme",
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"Used when a warning note as FIXME or XXX is detected.",
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)
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}
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options = (
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(
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"notes",
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{
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"type": "csv",
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"metavar": "<comma separated values>",
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"default": ("FIXME", "XXX", "TODO"),
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"help": (
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"List of note tags to take in consideration, "
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"separated by a comma."
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),
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},
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),
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(
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"notes-rgx",
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{
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"type": "string",
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"metavar": "<regexp>",
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"help": "Regular expression of note tags to take in consideration.",
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"default": "",
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},
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),
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)
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def open(self) -> None:
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super().open()
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notes = "|".join(re.escape(note) for note in self.linter.config.notes)
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if self.linter.config.notes_rgx:
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regex_string = rf"#\s*({notes}|{self.linter.config.notes_rgx})(?=(:|\s|\Z))"
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else:
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regex_string = rf"#\s*({notes})(?=(:|\s|\Z))"
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self._fixme_pattern = re.compile(regex_string, re.I)
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def _check_encoding(
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self, lineno: int, line: bytes, file_encoding: str
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) -> str | None:
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try:
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return line.decode(file_encoding)
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except UnicodeDecodeError:
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pass
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except LookupError:
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if (
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line.startswith(b"#")
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and "coding" in str(line)
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and file_encoding in str(line)
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):
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msg = f"Cannot decode using encoding '{file_encoding}', bad encoding"
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self.add_message("syntax-error", line=lineno, args=msg)
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return None
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def process_module(self, node: nodes.Module) -> None:
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"""Inspect the source file to find encoding problem."""
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encoding = node.file_encoding if node.file_encoding else "ascii"
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with node.stream() as stream:
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for lineno, line in enumerate(stream):
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self._check_encoding(lineno + 1, line, encoding)
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def process_tokens(self, tokens: list[tokenize.TokenInfo]) -> None:
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"""Inspect the source to find fixme problems."""
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if not self.linter.config.notes:
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return
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for token_info in tokens:
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if token_info.type != tokenize.COMMENT:
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continue
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comment_text = token_info.string[1:].lstrip() # trim '#' and white-spaces
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if self._fixme_pattern.search("#" + comment_text.lower()):
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self.add_message(
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"fixme",
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col_offset=token_info.start[1] + 1,
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args=comment_text,
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line=token_info.start[0],
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)
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def register(linter: PyLinter) -> None:
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linter.register_checker(EncodingChecker(linter))
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linter.register_checker(ByIdManagedMessagesChecker(linter))
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