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EDIT :: fix_features.py

u""" Warn about features that are not present in Python 2.5, giving a message that points to the earliest version of Python 2.x (or 3.x, if none) that supports it """ from .feature_base import Feature, Features from lib2to3 import fixer_base FEATURES = [ #(FeatureName, # FeaturePattern, # FeatureMinVersion, #), (u"memoryview", u"power < 'memoryview' trailer < '(' any* ')' > any* >", u"2.7", ), (u"numbers", u"""import_from< 'from' 'numbers' 'import' any* > | import_name< 'import' ('numbers' dotted_as_names< any* 'numbers' any* >) >""", u"2.6", ), (u"abc", u"""import_name< 'import' ('abc' dotted_as_names< any* 'abc' any* >) > | import_from< 'from' 'abc' 'import' any* >""", u"2.6", ), (u"io", u"""import_name< 'import' ('io' dotted_as_names< any* 'io' any* >) > | import_from< 'from' 'io' 'import' any* >""", u"2.6", ), (u"bin", u"power< 'bin' trailer< '(' any* ')' > any* >", u"2.6", ), (u"formatting", u"power< any trailer< '.' 'format' > trailer< '(' any* ')' > >", u"2.6", ), (u"nonlocal", u"global_stmt< 'nonlocal' any* >", u"3.0", ), (u"with_traceback", u"trailer< '.' 'with_traceback' >", u"3.0", ), ] class FixFeatures(fixer_base.BaseFix): run_order = 9 # Wait until all other fixers have run to check for these # To avoid spamming, we only want to warn for each feature once. features_warned = set() # Build features from the list above features = Features([Feature(name, pattern, version) for \ name, pattern, version in FEATURES]) PATTERN = features.PATTERN def match(self, node): to_ret = super(FixFeatures, self).match(node) # We want the mapping only to tell us the node's specific information. try: del to_ret[u'node'] except Exception: # We want it to delete the 'node' from the results # if it's there, so we don't care if it fails for normal reasons. pass return to_ret def transform(self, node, results): for feature_name in results: if feature_name in self.features_warned: continue else: curr_feature = self.features[feature_name] if curr_feature.version >= u"3": fail = self.cannot_convert else: fail = self.warning fail(node, reason=curr_feature.message_text()) self.features_warned.add(feature_name)

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