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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
"""Checker for spelling errors in comments and docstrings."""
from __future__ import annotations
import re
import sys
import tokenize
from re import Pattern
from typing import TYPE_CHECKING, Any
from astroid import nodes
from pylint.checkers import BaseTokenChecker
from pylint.checkers.utils import only_required_for_messages
if sys.version_info >= (3, 8):
from typing import Literal
else:
from typing_extensions import Literal
if TYPE_CHECKING:
from pylint.lint import PyLinter
try:
import enchant
from enchant.tokenize import (
Chunker,
EmailFilter,
Filter,
URLFilter,
WikiWordFilter,
get_tokenizer,
)
PYENCHANT_AVAILABLE = True
except ImportError: # pragma: no cover
enchant = None
PYENCHANT_AVAILABLE = False
class EmailFilter: # type: ignore[no-redef]
...
class URLFilter: # type: ignore[no-redef]
...
class WikiWordFilter: # type: ignore[no-redef]
...
class Filter: # type: ignore[no-redef]
def _skip(self, word: str) -> bool:
raise NotImplementedError
class Chunker: # type: ignore[no-redef]
pass
def get_tokenizer(
tag: str | None = None, # pylint: disable=unused-argument
chunkers: list[Chunker] | None = None, # pylint: disable=unused-argument
filters: list[Filter] | None = None, # pylint: disable=unused-argument
) -> Filter:
return Filter()
def _get_enchant_dicts() -> list[tuple[Any, enchant.ProviderDesc]]:
# Broker().list_dicts() is not typed in enchant, but it does return tuples
return enchant.Broker().list_dicts() if PYENCHANT_AVAILABLE else [] # type: ignore[no-any-return]
def _get_enchant_dict_choices(
inner_enchant_dicts: list[tuple[Any, enchant.ProviderDesc]]
) -> list[str]:
return [""] + [d[0] for d in inner_enchant_dicts]
def _get_enchant_dict_help(
inner_enchant_dicts: list[tuple[Any, enchant.ProviderDesc]],
pyenchant_available: bool,
) -> str:
if inner_enchant_dicts:
dict_as_str = [f"{d[0]} ({d[1].name})" for d in inner_enchant_dicts]
enchant_help = f"Available dictionaries: {', '.join(dict_as_str)}"
else:
enchant_help = "No available dictionaries : You need to install "
if not pyenchant_available:
enchant_help += "both the python package and "
enchant_help += "the system dependency for enchant to work."
return f"Spelling dictionary name. {enchant_help}."
enchant_dicts = _get_enchant_dicts()
class WordsWithDigitsFilter(Filter): # type: ignore[misc]
"""Skips words with digits."""
def _skip(self, word: str) -> bool:
return any(char.isdigit() for char in word)
class WordsWithUnderscores(Filter): # type: ignore[misc]
"""Skips words with underscores.
They are probably function parameter names.
"""
def _skip(self, word: str) -> bool:
return "_" in word
class RegExFilter(Filter): # type: ignore[misc]
"""Parent class for filters using regular expressions.
This filter skips any words the match the expression
assigned to the class attribute ``_pattern``.
"""
_pattern: Pattern[str]
def _skip(self, word: str) -> bool:
return bool(self._pattern.match(word))
class CamelCasedWord(RegExFilter):
r"""Filter skipping over camelCasedWords.
This filter skips any words matching the following regular expression:
^([a-z]\w+[A-Z]+\w+)
That is, any words that are camelCasedWords.
"""
_pattern = re.compile(r"^([a-z]+(\d|[A-Z])(?:\w+)?)")
class SphinxDirectives(RegExFilter):
r"""Filter skipping over Sphinx Directives.
This filter skips any words matching the following regular expression:
^(:([a-z]+)){1,2}:`([^`]+)(`)?
That is, for example, :class:`BaseQuery`
"""
# The final ` in the pattern is optional because enchant strips it out
_pattern = re.compile(r"^(:([a-z]+)){1,2}:`([^`]+)(`)?")
class ForwardSlashChunker(Chunker): # type: ignore[misc]
"""This chunker allows splitting words like 'before/after' into 'before' and
'after'.
"""
_text: str
def next(self) -> tuple[str, int]:
while True:
if not self._text:
raise StopIteration()
if "/" not in self._text:
text = self._text
self._offset = 0
self._text = ""
return text, 0
pre_text, post_text = self._text.split("/", 1)
self._text = post_text
self._offset = 0
if (
not pre_text
or not post_text
or not pre_text[-1].isalpha()
or not post_text[0].isalpha()
):
self._text = ""
self._offset = 0
return f"{pre_text}/{post_text}", 0
return pre_text, 0
def _next(self) -> tuple[str, Literal[0]]:
while True:
if "/" not in self._text:
return self._text, 0
pre_text, post_text = self._text.split("/", 1)
if not pre_text or not post_text:
break
if not pre_text[-1].isalpha() or not post_text[0].isalpha():
raise StopIteration()
self._text = pre_text + " " + post_text
raise StopIteration()
CODE_FLANKED_IN_BACKTICK_REGEX = re.compile(r"(\s|^)(`{1,2})([^`]+)(\2)([^`]|$)")
def _strip_code_flanked_in_backticks(line: str) -> str:
"""Alter line so code flanked in back-ticks is ignored.
Pyenchant automatically strips back-ticks when parsing tokens,
so this cannot be done at the individual filter level.
"""
def replace_code_but_leave_surrounding_characters(match_obj: re.Match[str]) -> str:
return match_obj.group(1) + match_obj.group(5)
return CODE_FLANKED_IN_BACKTICK_REGEX.sub(
replace_code_but_leave_surrounding_characters, line
)
class SpellingChecker(BaseTokenChecker):
"""Check spelling in comments and docstrings."""
name = "spelling"
msgs = {
"C0401": (
"Wrong spelling of a word '%s' in a comment:\n%s\n"
"%s\nDid you mean: '%s'?",
"wrong-spelling-in-comment",
"Used when a word in comment is not spelled correctly.",
),
"C0402": (
"Wrong spelling of a word '%s' in a docstring:\n%s\n"
"%s\nDid you mean: '%s'?",
"wrong-spelling-in-docstring",
"Used when a word in docstring is not spelled correctly.",
),
"C0403": (
"Invalid characters %r in a docstring",
"invalid-characters-in-docstring",
"Used when a word in docstring cannot be checked by enchant.",
),
}
options = (
(
"spelling-dict",
{
"default": "",
"type": "choice",
"metavar": "<dict name>",
"choices": _get_enchant_dict_choices(enchant_dicts),
"help": _get_enchant_dict_help(enchant_dicts, PYENCHANT_AVAILABLE),
},
),
(
"spelling-ignore-words",
{
"default": "",
"type": "string",
"metavar": "<comma separated words>",
"help": "List of comma separated words that should not be checked.",
},
),
(
"spelling-private-dict-file",
{
"default": "",
"type": "path",
"metavar": "<path to file>",
"help": "A path to a file that contains the private "
"dictionary; one word per line.",
},
),
(
"spelling-store-unknown-words",
{
"default": "n",
"type": "yn",
"metavar": "<y or n>",
"help": "Tells whether to store unknown words to the "
"private dictionary (see the "
"--spelling-private-dict-file option) instead of "
"raising a message.",
},
),
(
"max-spelling-suggestions",
{
"default": 4,
"type": "int",
"metavar": "N",
"help": "Limits count of emitted suggestions for spelling mistakes.",
},
),
(
"spelling-ignore-comment-directives",
{
"default": "fmt: on,fmt: off,noqa:,noqa,nosec,isort:skip,mypy:",
"type": "string",
"metavar": "<comma separated words>",
"help": "List of comma separated words that should be considered "
"directives if they appear at the beginning of a comment "
"and should not be checked.",
},
),
)
def open(self) -> None:
self.initialized = False
if not PYENCHANT_AVAILABLE:
return
dict_name = self.linter.config.spelling_dict
if not dict_name:
return
self.ignore_list = [
w.strip() for w in self.linter.config.spelling_ignore_words.split(",")
]
# "param" appears in docstring in param description and
# "pylint" appears in comments in pylint pragmas.
self.ignore_list.extend(["param", "pylint"])
self.ignore_comment_directive_list = [
w.strip()
for w in self.linter.config.spelling_ignore_comment_directives.split(",")
]
if self.linter.config.spelling_private_dict_file:
self.spelling_dict = enchant.DictWithPWL(
dict_name, self.linter.config.spelling_private_dict_file
)
else:
self.spelling_dict = enchant.Dict(dict_name)
if self.linter.config.spelling_store_unknown_words:
self.unknown_words: set[str] = set()
self.tokenizer = get_tokenizer(
dict_name,
chunkers=[ForwardSlashChunker],
filters=[
EmailFilter,
URLFilter,
WikiWordFilter,
WordsWithDigitsFilter,
WordsWithUnderscores,
CamelCasedWord,
SphinxDirectives,
],
)
self.initialized = True
# pylint: disable = too-many-statements
def _check_spelling(self, msgid: str, line: str, line_num: int) -> None:
original_line = line
try:
# The mypy warning is caught by the except statement
initial_space = re.search(r"^\s+", line).regs[0][1] # type: ignore[union-attr]
except (IndexError, AttributeError):
initial_space = 0
if line.strip().startswith("#") and "docstring" not in msgid:
line = line.strip()[1:]
# A ``Filter`` cannot determine if the directive is at the beginning of a line,
# nor determine if a colon is present or not (``pyenchant`` strips trailing colons).
# So implementing this here.
for iter_directive in self.ignore_comment_directive_list:
if line.startswith(" " + iter_directive):
line = line[(len(iter_directive) + 1) :]
break
starts_with_comment = True
else:
starts_with_comment = False
line = _strip_code_flanked_in_backticks(line)
for word, word_start_at in self.tokenizer(line.strip()):
word_start_at += initial_space
lower_cased_word = word.casefold()
# Skip words from ignore list.
if word in self.ignore_list or lower_cased_word in self.ignore_list:
continue
# Strip starting u' from unicode literals and r' from raw strings.
if word.startswith(("u'", 'u"', "r'", 'r"')) and len(word) > 2:
word = word[2:]
lower_cased_word = lower_cased_word[2:]
# If it is a known word, then continue.
try:
if self.spelling_dict.check(lower_cased_word):
# The lower cased version of word passed spell checking
continue
# If we reached this far, it means there was a spelling mistake.
# Let's retry with the original work because 'unicode' is a
# spelling mistake but 'Unicode' is not
if self.spelling_dict.check(word):
continue
except enchant.errors.Error:
self.add_message(
"invalid-characters-in-docstring", line=line_num, args=(word,)
)
continue
# Store word to private dict or raise a message.
if self.linter.config.spelling_store_unknown_words:
if lower_cased_word not in self.unknown_words:
with open(
self.linter.config.spelling_private_dict_file,
"a",
encoding="utf-8",
) as f:
f.write(f"{lower_cased_word}\n")
self.unknown_words.add(lower_cased_word)
else:
# Present up to N suggestions.
suggestions = self.spelling_dict.suggest(word)
del suggestions[self.linter.config.max_spelling_suggestions :]
line_segment = line[word_start_at:]
match = re.search(rf"(\W|^)({word})(\W|$)", line_segment)
if match:
# Start position of second group in regex.
col = match.regs[2][0]
else:
col = line_segment.index(word)
col += word_start_at
if starts_with_comment:
col += 1
indicator = (" " * col) + ("^" * len(word))
all_suggestion = "' or '".join(suggestions)
args = (word, original_line, indicator, f"'{all_suggestion}'")
self.add_message(msgid, line=line_num, args=args)
def process_tokens(self, tokens: list[tokenize.TokenInfo]) -> None:
if not self.initialized:
return
# Process tokens and look for comments.
for tok_type, token, (start_row, _), _, _ in tokens:
if tok_type == tokenize.COMMENT:
if start_row == 1 and token.startswith("#!/"):
# Skip shebang lines
continue
if token.startswith("# pylint:"):
# Skip pylint enable/disable comments
continue
if token.startswith("# type: "):
# Skip python 2 type comments and mypy type ignore comments
# mypy do not support additional text in type comments
continue
self._check_spelling("wrong-spelling-in-comment", token, start_row)
@only_required_for_messages("wrong-spelling-in-docstring")
def visit_module(self, node: nodes.Module) -> None:
self._check_docstring(node)
@only_required_for_messages("wrong-spelling-in-docstring")
def visit_classdef(self, node: nodes.ClassDef) -> None:
self._check_docstring(node)
@only_required_for_messages("wrong-spelling-in-docstring")
def visit_functiondef(
self, node: nodes.FunctionDef | nodes.AsyncFunctionDef
) -> None:
self._check_docstring(node)
visit_asyncfunctiondef = visit_functiondef
def _check_docstring(
self,
node: nodes.FunctionDef
| nodes.AsyncFunctionDef
| nodes.ClassDef
| nodes.Module,
) -> None:
"""Check if the node has any spelling errors."""
if not self.initialized:
return
if not node.doc_node:
return
start_line = node.lineno + 1
# Go through lines of docstring
for idx, line in enumerate(node.doc_node.value.splitlines()):
self._check_spelling("wrong-spelling-in-docstring", line, start_line + idx)
def register(linter: PyLinter) -> None:
linter.register_checker(SpellingChecker(linter))