""" Fixer for itertools.(imap|ifilter|izip) --> (map|filter|zip) and

    itertools.ifilterfalse --> itertools.filterfalse (bugs 2360-2363)

    imports from itertools are fixed in fix_itertools_import.py

    If itertools is imported as something else (ie: import itertools as it;

    it.izip(spam, eggs)) method calls will not get fixed.

    """

# Local imports

from .. import fixer_base

from ..fixer_util import Name

class FixItertools(fixer_base.BaseFix):

    it_funcs = "('imap'|'ifilter'|'izip'|'ifilterfalse')"

    PATTERN = """

              power< it='itertools'

                  trailer<

                     dot='.' func=%(it_funcs)s > trailer< '(' [any] ')' > >

              |

              power< func=%(it_funcs)s trailer< '(' [any] ')' > >

              """ %(locals())

    # Needs to be run after fix_(map|zip|filter)

    run_order = 6

    def transform(self, node, results):

        prefix = None

        func = results['func'][0]

        if 'it' in results and func.value != 'ifilterfalse':

            dot, it = (results['dot'], results['it'])

            # Remove the 'itertools'

            prefix = it.get_prefix()

            it.remove()

            # Replace the node wich contains ('.', 'function') with the

            # function (to be consistant with the second part of the pattern)

            dot.remove()

            func.parent.replace(func)

        prefix = prefix or func.get_prefix()

        func.replace(Name(func.value[1:], prefix=prefix))