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75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
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# Copyright (c) 2019-2020 Claudiu Popa <pcmanticore@gmail.com>
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# Copyright (c) 2019-2020 Tyler Thieding <tyler@thieding.com>
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# Copyright (c) 2020 Anthony Sottile <asottile@umich.edu>
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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 try/except statements with too much code in the try clause."""
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from astroid.node_classes import For, If, While, With
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from pylint import checkers, interfaces
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class BroadTryClauseChecker(checkers.BaseChecker):
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"""Checks for try clauses with too many lines.
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According to PEP 8, ``try`` clauses shall contain the absolute minimum
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amount of code. This checker enforces a maximum number of statements within
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``try`` clauses.
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"""
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__implements__ = interfaces.IAstroidChecker
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# configuration section name
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name = "broad_try_clause"
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msgs = {
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"W0717": (
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"%s",
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"too-many-try-statements",
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"Try clause contains too many statements.",
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)
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}
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priority = -2
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options = (
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(
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"max-try-statements",
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{
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"default": 1,
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"type": "int",
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"metavar": "<int>",
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"help": "Maximum number of statements allowed in a try clause",
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},
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),
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)
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def _count_statements(self, try_node):
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statement_count = len(try_node.body)
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for body_node in try_node.body:
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if isinstance(body_node, (For, If, While, With)):
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statement_count += self._count_statements(body_node)
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return statement_count
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def visit_tryexcept(self, node):
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try_clause_statements = self._count_statements(node)
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if try_clause_statements > self.config.max_try_statements:
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msg = "try clause contains {} statements, expected at most {}".format(
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try_clause_statements, self.config.max_try_statements
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)
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self.add_message(
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"too-many-try-statements", node.lineno, node=node, args=msg
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)
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def visit_tryfinally(self, node):
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self.visit_tryexcept(node)
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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(BroadTryClauseChecker(linter))
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