# 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):

    PATTERN = """

              power< (name='range'|name='xrange') trailer< '(' [any] ')' > any* >

              """

    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.get_prefix()))

    def transform_range(self, node, results):

        if not self.in_special_context(node):

            arg = node.clone()

            arg.set_prefix("")

            call = Call(Name("list"), [arg])

            call.set_prefix(node.get_prefix())

            return call

        return node

    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