# Copyright 2007 Google, Inc. All Rights Reserved.

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# Licensed to PSF under a Contributor Agreement.

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"""Fixer that changes xrange(...) into range(...)."""

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# Local imports

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from .. import fixer_base

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from ..fixer_util import Name, Call, consuming_calls

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from .. import patcomp

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class FixXrange(fixer_base.BaseFix):

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BM_compatible = True

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PATTERN = """

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power<

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(name='range'|name='xrange') trailer< '(' args=any ')' >

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rest=any* >

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"""

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def start_tree(self, tree, filename):

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super(FixXrange, self).start_tree(tree, filename)

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self.transformed_xranges = set()

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def finish_tree(self, tree, filename):

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self.transformed_xranges = None

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def transform(self, node, results):

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name = results["name"]

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if name.value == u"xrange":

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return self.transform_xrange(node, results)

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elif name.value == u"range":

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return self.transform_range(node, results)

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else:

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raise ValueError(repr(name))

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def transform_xrange(self, node, results):

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name = results["name"]

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name.replace(Name(u"range", prefix=name.prefix))

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# This prevents the new range call from being wrapped in a list later.

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self.transformed_xranges.add(id(node))

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def transform_range(self, node, results):

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if (id(node) not in self.transformed_xranges and

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not self.in_special_context(node)):

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range_call = Call(Name(u"range"), [results["args"].clone()])

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# Encase the range call in list().

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list_call = Call(Name(u"list"), [range_call],

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prefix=node.prefix)

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# Put things that were after the range() call after the list call.

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for n in results["rest"]:

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list_call.append_child(n)

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return list_call

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P1 = "power< func=NAME trailer< '(' node=any ')' > any* >"

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p1 = patcomp.compile_pattern(P1)

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P2 = """for_stmt< 'for' any 'in' node=any ':' any* >

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| comp_for< 'for' any 'in' node=any any* >

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| comparison< any 'in' node=any any*>

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"""

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p2 = patcomp.compile_pattern(P2)

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def in_special_context(self, node):

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if node.parent is None:

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return False

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results = {}

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if (node.parent.parent is not None and

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self.p1.match(node.parent.parent, results) and

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results["node"] is node):

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# list(d.keys()) -> list(d.keys()), etc.

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return results["func"].value in consuming_calls

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# for ... in d.iterkeys() -> for ... in d.keys(), etc.

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return self.p2.match(node.parent, results) and results["node"] is node

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