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from logilab import astng
from pylint.interfaces import IASTNGChecker
from pylint.checkers import BaseChecker
from pylint.checkers.utils import safe_infer
class ExceptionMessageChecker(BaseChecker):
__implements__ = IASTNGChecker
name = 'Exception Messages'
msgs = \
{'R9901': ('Exception raised without arguments',
'Used when an exception is raised without any arguments')}
options = (
('exceptions-without-args',
dict(default=('NotImplementedError',),
type='csv',
metavar='<exception names>',
help='List of exception names that may be raised without arguments')),)
# this is important so that your checker is executed before others
priority = -1
def visit_raise(self, node):
if node.exc is None:
return
if isinstance(node.exc, astng.Name):
raised = safe_infer(node.exc)
if (isinstance(raised, astng.Class) and
raised.name not in self.config.exceptions_without_args):
self.add_message('R9901', node=node.exc)
def register(linter):
"""required method to auto register this checker"""
linter.register_checker(ExceptionMessageChecker(linter))
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