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# Copyright (c) 2015 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2016-2020 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2016 Glenn Matthews <glmatthe@cisco.com>
# Copyright (c) 2018 Ville Skyttä <ville.skytta@iki.fi>
# Copyright (c) 2019-2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2020 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2020 Anthony Sottile <asottile@umich.edu>
# Copyright (c) 2021 bot <bot@noreply.github.com>
# Copyright (c) 2021 Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
# Copyright (c) 2021 Marc Mueller <30130371+cdce8p@users.noreply.github.com>
# 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
from astroid import nodes
from pylint.checkers import BaseTokenChecker
from pylint.checkers.utils import check_messages
from pylint.interfaces import HIGH, IAstroidChecker, ITokenChecker
class ElseifUsedChecker(BaseTokenChecker):
"""Checks for use of "else if" when an "elif" could be used"""
__implements__ = (ITokenChecker, IAstroidChecker)
name = "else_if_used"
msgs = {
"R5501": (
'Consider using "elif" instead of "else if"',
"else-if-used",
"Used when an else statement is immediately followed by "
"an if statement and does not contain statements that "
"would be unrelated to it.",
)
}
def __init__(self, linter=None):
super().__init__(linter)
self._init()
def _init(self):
self._elifs = {}
def process_tokens(self, tokens):
"""Process tokens and look for 'if' or 'elif'"""
self._elifs = {
begin: token for _, token, begin, _, _ in tokens if token in {"elif", "if"}
}
def leave_module(self, _: nodes.Module) -> None:
self._init()
@check_messages("else-if-used")
def visit_if(self, node: nodes.If) -> None:
"""Current if node must directly follow an 'else'"""
if (
isinstance(node.parent, nodes.If)
and node.parent.orelse == [node]
and (node.lineno, node.col_offset) in self._elifs
and self._elifs[(node.lineno, node.col_offset)] == "if"
):
self.add_message("else-if-used", node=node, confidence=HIGH)
def register(linter):
"""Required method to auto register this checker.
:param linter: Main interface object for Pylint plugins
:type linter: Pylint object
"""
linter.register_checker(ElseifUsedChecker(linter))
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