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