""" 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):
BM_compatible = True
it_funcs = "('imap'|'ifilter'|'izip'|'izip_longest'|'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 not in (u'ifilterfalse', u'izip_longest')):
dot, it = (results['dot'], results['it'])
# Remove the 'itertools'
prefix = it.prefix
it.remove()
# Replace the node which contains ('.', 'function') with the
# function (to be consistent with the second part of the pattern)
dot.remove()
func.parent.replace(func)

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