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# Copyright (c) 2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2021 Andreas Finkler <andi.finkler@gmail.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
import astroid
from pylint.checkers import BaseChecker
from pylint.checkers.utils import check_messages
from pylint.interfaces import IAstroidChecker
from pylint.lint import PyLinter
class ConfusingConsecutiveElifChecker(BaseChecker):
"""Checks if "elif" is used right after an indented block that finishes with "if" or "elif" itself."""
__implements__ = IAstroidChecker
name = "confusing_elif"
priority = -1
msgs = {
"R5601": (
"Consecutive elif with differing indentation level, consider creating a function to separate the inner elif",
"confusing-consecutive-elif",
"Used when an elif statement follows right after an indented block which itself ends with if or elif. "
"It may not be ovious if the elif statement was willingly or mistakenly unindented. "
"Extracting the indented if statement into a separate function might avoid confusion and prevent errors.",
)
}
@check_messages("confusing-consecutive-elif")
def visit_if(self, node: astroid.If):
body_ends_with_if = isinstance(
node.body[-1], astroid.If
) and self._has_no_else_clause(node.body[-1])
if node.has_elif_block() and body_ends_with_if:
self.add_message("confusing-consecutive-elif", node=node.orelse[0])
@staticmethod
def _has_no_else_clause(node: astroid.If):
orelse = node.orelse
while orelse and isinstance(orelse[0], astroid.If):
orelse = orelse[0].orelse
if not orelse or isinstance(orelse[0], astroid.If):
return True
return False
def register(linter: PyLinter):
"""This required method auto registers the checker.
:param linter: The linter to register the checker to.
:type linter: pylint.lint.PyLinter
"""
linter.register_checker(ConfusingConsecutiveElifChecker(linter))
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