"""
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):

BM_compatible = True
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.prefix = u""
new = Call(Name(u"list"), [new])
new.prefix = node.prefix
return new