1  # Copyright 2007 Google, Inc. All Rights Reserved.
       2  # Licensed to PSF under a Contributor Agreement.
       3  
       4  """Fixer that changes xrange(...) into range(...)."""
       5  
       6  # Local imports
       7  from .. import fixer_base
       8  from ..fixer_util import Name, Call, consuming_calls
       9  from .. import patcomp
      10  
      11  
      12  class ESC[4;38;5;81mFixXrange(ESC[4;38;5;149mfixer_baseESC[4;38;5;149m.ESC[4;38;5;149mBaseFix):
      13      BM_compatible = True
      14      PATTERN = """
      15                power<
      16                   (name='range'|name='xrange') trailer< '(' args=any ')' >
      17                rest=any* >
      18                """
      19  
      20      def start_tree(self, tree, filename):
      21          super(FixXrange, self).start_tree(tree, filename)
      22          self.transformed_xranges = set()
      23  
      24      def finish_tree(self, tree, filename):
      25          self.transformed_xranges = None
      26  
      27      def transform(self, node, results):
      28          name = results["name"]
      29          if name.value == "xrange":
      30              return self.transform_xrange(node, results)
      31          elif name.value == "range":
      32              return self.transform_range(node, results)
      33          else:
      34              raise ValueError(repr(name))
      35  
      36      def transform_xrange(self, node, results):
      37          name = results["name"]
      38          name.replace(Name("range", prefix=name.prefix))
      39          # This prevents the new range call from being wrapped in a list later.
      40          self.transformed_xranges.add(id(node))
      41  
      42      def transform_range(self, node, results):
      43          if (id(node) not in self.transformed_xranges and
      44              not self.in_special_context(node)):
      45              range_call = Call(Name("range"), [results["args"].clone()])
      46              # Encase the range call in list().
      47              list_call = Call(Name("list"), [range_call],
      48                               prefix=node.prefix)
      49              # Put things that were after the range() call after the list call.
      50              for n in results["rest"]:
      51                  list_call.append_child(n)
      52              return list_call
      53  
      54      P1 = "power< func=NAME trailer< '(' node=any ')' > any* >"
      55      p1 = patcomp.compile_pattern(P1)
      56  
      57      P2 = """for_stmt< 'for' any 'in' node=any ':' any* >
      58              | comp_for< 'for' any 'in' node=any any* >
      59              | comparison< any 'in' node=any any*>
      60           """
      61      p2 = patcomp.compile_pattern(P2)
      62  
      63      def in_special_context(self, node):
      64          if node.parent is None:
      65              return False
      66          results = {}
      67          if (node.parent.parent is not None and
      68                 self.p1.match(node.parent.parent, results) and
      69                 results["node"] is node):
      70              # list(d.keys()) -> list(d.keys()), etc.
      71              return results["func"].value in consuming_calls
      72          # for ... in d.iterkeys() -> for ... in d.keys(), etc.
      73          return self.p2.match(node.parent, results) and results["node"] is node