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https://github.com/PiBrewing/craftbeerpi4.git
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87 lines
3.2 KiB
Python
87 lines
3.2 KiB
Python
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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
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"""Looks for overlapping exceptions."""
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import astroid
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from pylint import checkers, interfaces
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from pylint.checkers import utils
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from pylint.checkers.exceptions import _annotated_unpack_infer
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class OverlappingExceptionsChecker(checkers.BaseChecker):
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"""Checks for two or more exceptions in the same exception handler
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clause that are identical or parts of the same inheritance hierarchy
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(i.e. overlapping)."""
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__implements__ = interfaces.IAstroidChecker
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name = "overlap-except"
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msgs = {
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"W0714": (
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"Overlapping exceptions (%s)",
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"overlapping-except",
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"Used when exceptions in handler overlap or are identical",
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)
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}
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priority = -2
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options = ()
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@utils.check_messages("overlapping-except")
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def visit_tryexcept(self, node):
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"""check for empty except"""
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for handler in node.handlers:
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if handler.type is None:
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continue
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if isinstance(handler.type, astroid.BoolOp):
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continue
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try:
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excs = list(_annotated_unpack_infer(handler.type))
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except astroid.InferenceError:
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continue
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handled_in_clause = []
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for part, exc in excs:
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if exc is astroid.Uninferable:
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continue
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if isinstance(exc, astroid.Instance) and utils.inherit_from_std_ex(exc):
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# pylint: disable=protected-access
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exc = exc._proxied
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if not isinstance(exc, astroid.ClassDef):
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continue
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exc_ancestors = [
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anc for anc in exc.ancestors() if isinstance(anc, astroid.ClassDef)
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]
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for prev_part, prev_exc in handled_in_clause:
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prev_exc_ancestors = [
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anc
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for anc in prev_exc.ancestors()
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if isinstance(anc, astroid.ClassDef)
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]
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if exc == prev_exc:
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self.add_message(
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"overlapping-except",
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node=handler.type,
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args="%s and %s are the same"
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% (prev_part.as_string(), part.as_string()),
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)
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elif prev_exc in exc_ancestors or exc in prev_exc_ancestors:
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ancestor = part if exc in prev_exc_ancestors else prev_part
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descendant = part if prev_exc in exc_ancestors else prev_part
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self.add_message(
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"overlapping-except",
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node=handler.type,
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args="%s is an ancestor class of %s"
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% (ancestor.as_string(), descendant.as_string()),
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)
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handled_in_clause += [(part, exc)]
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def register(linter):
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"""Required method to auto register this checker."""
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linter.register_checker(OverlappingExceptionsChecker(linter))
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