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74 lines
2.6 KiB
74 lines
2.6 KiB
6 years ago
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# 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 == "xrange":
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return self.transform_xrange(node, results)
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elif name.value == "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("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("range"), [results["args"].clone()])
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# Encase the range call in list().
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list_call = Call(Name("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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