diff options
Diffstat (limited to 'pyflakes/checker.py')
| -rw-r--r-- | pyflakes/checker.py | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/pyflakes/checker.py b/pyflakes/checker.py index c8ccf56..3f5a7e0 100644 --- a/pyflakes/checker.py +++ b/pyflakes/checker.py @@ -1009,12 +1009,30 @@ class Checker(object): self.scope[value.name] = value + def _unknown_handler(self, node): + # this environment variable configures whether to error on unknown + # ast types. + # + # this is silent by default but the error is enabled for the pyflakes + # testsuite. + # + # this allows new syntax to be added to python without *requiring* + # changes from the pyflakes side. but will still produce an error + # in the pyflakes testsuite (so more specific handling can be added if + # needed). + if os.environ.get('PYFLAKES_ERROR_UNKNOWN'): + raise NotImplementedError('Unexpected type: {}'.format(type(node))) + else: + self.handleChildren(node) + def getNodeHandler(self, node_class): try: return self._nodeHandlers[node_class] except KeyError: nodeType = getNodeType(node_class) - self._nodeHandlers[node_class] = handler = getattr(self, nodeType) + self._nodeHandlers[node_class] = handler = getattr( + self, nodeType, self._unknown_handler, + ) return handler def handleNodeLoad(self, node): |