Add future 0.18.2

lib/libpasteurize/fixes/fix_features.py

@@ -0,0 +1,86 @@
+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)