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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
from typing import TYPE_CHECKING
from astroid import nodes
from pylint.checkers import BaseChecker
from pylint.constants import DUNDER_METHODS, DUNDER_PROPERTIES, EXTRA_DUNDER_METHODS
from pylint.interfaces import HIGH
if TYPE_CHECKING:
from pylint.lint import PyLinter
class DunderChecker(BaseChecker):
"""Checks related to dunder methods."""
name = "dunder"
priority = -1
msgs = {
"W3201": (
"Bad or misspelled dunder method name %s.",
"bad-dunder-name",
"Used when a dunder method is misspelled or defined with a name "
"not within the predefined list of dunder names.",
),
}
options = (
(
"good-dunder-names",
{
"default": [],
"type": "csv",
"metavar": "<comma-separated names>",
"help": "Good dunder names which should always be accepted.",
},
),
)
def open(self) -> None:
self._dunder_methods = (
EXTRA_DUNDER_METHODS
+ DUNDER_PROPERTIES
+ self.linter.config.good_dunder_names
)
for since_vers, dunder_methods in DUNDER_METHODS.items():
if since_vers <= self.linter.config.py_version:
self._dunder_methods.extend(list(dunder_methods.keys()))
def visit_functiondef(self, node: nodes.FunctionDef) -> None:
"""Check if known dunder method is misspelled or dunder name is not one
of the pre-defined names.
"""
# ignore module-level functions
if not node.is_method():
return
# Detect something that could be a bad dunder method
if (
node.name.startswith("_")
and node.name.endswith("_")
and node.name not in self._dunder_methods
):
self.add_message(
"bad-dunder-name",
node=node,
args=(node.name),
confidence=HIGH,
)
def register(linter: PyLinter) -> None:
linter.register_checker(DunderChecker(linter))