"""

Fixer that changes zip(seq0, seq1, ...) into list(zip(seq0, seq1, ...)

unless there exists a 'from future_builtins import zip' statement in the

top-level namespace.

We avoid the transformation if the zip() call is directly contained in

iter(<>), list(<>), tuple(<>), sorted(<>), ...join(<>), or for V in <>:.

"""

# Local imports

from .. import fixer_base

from ..fixer_util import Name, Call, in_special_context

class FixZip(fixer_base.ConditionalFix):

    PATTERN = """

    power< 'zip' args=trailer< '(' [any] ')' >

    >

    """

    skip_on = "future_builtins.zip"

    def transform(self, node, results):

        if self.should_skip(node):

            return

        if in_special_context(node):

            return None

        new = node.clone()

        new.set_prefix("")

        new = Call(Name("list"), [new])

        new.set_prefix(node.get_prefix())

        return new