1"""
2Fixer that changes zip(seq0, seq1, ...) into list(zip(seq0, seq1, ...)
3unless there exists a 'from future_builtins import zip' statement in the
4top-level namespace.
5
6We avoid the transformation if the zip() call is directly contained in
7iter(<>), list(<>), tuple(<>), sorted(<>), ...join(<>), or for V in <>:.
8"""
9
10# Local imports
11from .. import fixer_base
12from ..pytree import Node
13from ..pygram import python_symbols as syms
14from ..fixer_util import Name, ArgList, in_special_context
15
16
17class FixZip(fixer_base.ConditionalFix):
18
19    BM_compatible = True
20    PATTERN = """
21    power< 'zip' args=trailer< '(' [any] ')' > [trailers=trailer*]
22    >
23    """
24
25    skip_on = "future_builtins.zip"
26
27    def transform(self, node, results):
28        if self.should_skip(node):
29            return
30
31        if in_special_context(node):
32            return None
33
34        args = results['args'].clone()
35        args.prefix = ""
36
37        trailers = []
38        if 'trailers' in results:
39            trailers = [n.clone() for n in results['trailers']]
40            for n in trailers:
41                n.prefix = ""
42
43        new = Node(syms.power, [Name("zip"), args], prefix="")
44        new = Node(syms.power, [Name("list"), ArgList([new])] + trailers)
45        new.prefix = node.prefix
46        return new
47