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-rw-r--r--lib/python2.7/lib2to3/fixes/fix_xrange.py73
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/python2.7/lib2to3/fixes/fix_xrange.py b/lib/python2.7/lib2to3/fixes/fix_xrange.py
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+++ b/lib/python2.7/lib2to3/fixes/fix_xrange.py
@@ -0,0 +1,73 @@
+# Copyright 2007 Google, Inc. All Rights Reserved.
+# Licensed to PSF under a Contributor Agreement.
+
+"""Fixer that changes xrange(...) into range(...)."""
+
+# Local imports
+from .. import fixer_base
+from ..fixer_util import Name, Call, consuming_calls
+from .. import patcomp
+
+
+class FixXrange(fixer_base.BaseFix):
+ BM_compatible = True
+ PATTERN = """
+ power<
+ (name='range'|name='xrange') trailer< '(' args=any ')' >
+ rest=any* >
+ """
+
+ def start_tree(self, tree, filename):
+ super(FixXrange, self).start_tree(tree, filename)
+ self.transformed_xranges = set()
+
+ def finish_tree(self, tree, filename):
+ self.transformed_xranges = None
+
+ def transform(self, node, results):
+ name = results["name"]
+ if name.value == u"xrange":
+ return self.transform_xrange(node, results)
+ elif name.value == u"range":
+ return self.transform_range(node, results)
+ else:
+ raise ValueError(repr(name))
+
+ def transform_xrange(self, node, results):
+ name = results["name"]
+ name.replace(Name(u"range", prefix=name.prefix))
+ # This prevents the new range call from being wrapped in a list later.
+ self.transformed_xranges.add(id(node))
+
+ def transform_range(self, node, results):
+ if (id(node) not in self.transformed_xranges and
+ not self.in_special_context(node)):
+ range_call = Call(Name(u"range"), [results["args"].clone()])
+ # Encase the range call in list().
+ list_call = Call(Name(u"list"), [range_call],
+ prefix=node.prefix)
+ # Put things that were after the range() call after the list call.
+ for n in results["rest"]:
+ list_call.append_child(n)
+ return list_call
+
+ P1 = "power< func=NAME trailer< '(' node=any ')' > any* >"
+ p1 = patcomp.compile_pattern(P1)
+
+ P2 = """for_stmt< 'for' any 'in' node=any ':' any* >
+ | comp_for< 'for' any 'in' node=any any* >
+ | comparison< any 'in' node=any any*>
+ """
+ p2 = patcomp.compile_pattern(P2)
+
+ def in_special_context(self, node):
+ if node.parent is None:
+ return False
+ results = {}
+ if (node.parent.parent is not None and
+ self.p1.match(node.parent.parent, results) and
+ results["node"] is node):
+ # list(d.keys()) -> list(d.keys()), etc.
+ return results["func"].value in consuming_calls
+ # for ... in d.iterkeys() -> for ... in d.keys(), etc.
+ return self.p2.match(node.parent, results) and results["node"] is node