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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
from __future__ import annotations
import linecache
from typing import TYPE_CHECKING
from astroid import nodes
from pylint import checkers
from pylint.checkers.utils import only_required_for_messages
from pylint.interfaces import HIGH
if TYPE_CHECKING:
from pylint.lint import PyLinter
class DocStringStyleChecker(checkers.BaseChecker):
"""Checks format of docstrings based on PEP 0257."""
name = "docstyle"
msgs = {
"C0198": (
'Bad docstring quotes in %s, expected """, given %s',
"bad-docstring-quotes",
"Used when a docstring does not have triple double quotes.",
),
"C0199": (
"First line empty in %s docstring",
"docstring-first-line-empty",
"Used when a blank line is found at the beginning of a docstring.",
),
}
@only_required_for_messages("docstring-first-line-empty", "bad-docstring-quotes")
def visit_module(self, node: nodes.Module) -> None:
self._check_docstring("module", node)
def visit_classdef(self, node: nodes.ClassDef) -> None:
self._check_docstring("class", node)
def visit_functiondef(self, node: nodes.FunctionDef) -> None:
ftype = "method" if node.is_method() else "function"
self._check_docstring(ftype, node)
visit_asyncfunctiondef = visit_functiondef
def _check_docstring(
self, node_type: str, node: nodes.Module | nodes.ClassDef | nodes.FunctionDef
) -> None:
docstring = node.doc_node.value if node.doc_node else None
if docstring and docstring[0] == "\n":
self.add_message(
"docstring-first-line-empty",
node=node,
args=(node_type,),
confidence=HIGH,
)
# Use "linecache", instead of node.as_string(), because the latter
# looses the original form of the docstrings.
if docstring:
lineno = node.fromlineno + 1
line = linecache.getline(node.root().file, lineno).lstrip()
if line and line.find('"""') == 0:
return
if line and "'''" in line:
quotes = "'''"
elif line and line[0] == '"':
quotes = '"'
elif line and line[0] == "'":
quotes = "'"
else:
quotes = ""
if quotes:
self.add_message(
"bad-docstring-quotes",
node=node,
args=(node_type, quotes),
confidence=HIGH,
)
def register(linter: PyLinter) -> None:
linter.register_checker(DocStringStyleChecker(linter))