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"""
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 basefix
from .util import Name, Call, does_tree_import, in_special_context
class FixZip(basefix.BaseFix):
PATTERN = """
power< 'zip' args=trailer< '(' [any] ')' >
>
"""
def start_tree(self, *args):
super(FixZip, self).start_tree(*args)
self._future_zip_found = None
def has_future_zip(self, node):
if self._future_zip_found is not None:
return self._future_zip_found
self._future_zip_found = does_tree_import('future_builtins', 'zip', node)
return self._future_zip_found
def transform(self, node, results):
if self.has_future_zip(node):
# If a future zip has been imported for this file, we won't
# be making any modifications
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
|
