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fix_xrange.py2.6 KB · 74 lines
# Copyright 2007 Google, Inc. All Rights Reserved.# Licensed to PSF under a Contributor Agreement. """Fixer that changes xrange(...) into range(...).""" # Local importsfrom .. import fixer_basefrom ..fixer_util import Name, Call, consuming_callsfrom .. 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 == "xrange":            return self.transform_xrange(node, results)        elif name.value == "range":            return self.transform_range(node, results)        else:            raise ValueError(repr(name))     def transform_xrange(self, node, results):        name = results["name"]        name.replace(Name("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("range"), [results["args"].clone()])            # Encase the range call in list().            list_call = Call(Name("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