Viewing file:  fix_features.py (2.61 KB) -rw-r--r--
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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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