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"""
Adds this import line:

    from builtins import XYZ

for each of the functions XYZ that is used in the module.
"""

from __future__ import unicode_literals

from lib2to3 import fixer_base
from lib2to3.pygram import python_symbols as syms
from lib2to3.fixer_util import Name, Call, in_special_context

from libfuturize.fixer_util import touch_import_top

# All builtins are:
#     from future.builtins.iterators import (filter, map, zip)
#     from future.builtins.misc import (ascii, chr, hex, input, isinstance, oct, open, round, super)
#     from future.types import (bytes, dict, int, range, str)
# We don't need isinstance any more.

replaced_builtins = '''filter map zip
                       ascii chr hex input next oct open round super
                       bytes dict int range str'''.split()

expression = '|'.join(["name='{0}'".format(name) for name in replaced_builtins])


class FixFutureBuiltins(fixer_base.BaseFix):
    BM_compatible = True
    run_order = 9

    # Currently we only match uses as a function. This doesn't match e.g.:
    #     if isinstance(s, str):
    #         ...
    PATTERN = """
              power<
                 ({0}) trailer< '(' args=[any] ')' >
              rest=any* >
              """.format(expression)

    def transform(self, node, results):
        name = results["name"]
        touch_import_top(u'builtins', name.value, node)
        # name.replace(Name(u"input", prefix=name.prefix))