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1""" Fixer for itertools.(imap|ifilter|izip) --> (map|filter|zip) and
2    itertools.ifilterfalse --> itertools.filterfalse (bugs 2360-2363)
3
4    imports from itertools are fixed in fix_itertools_import.py
5
6    If itertools is imported as something else (ie: import itertools as it;
7    it.izip(spam, eggs)) method calls will not get fixed.
8    """
9
10# Local imports
11from .. import fixer_base
12from ..fixer_util import Name
13
14class FixItertools(fixer_base.BaseFix):
15    BM_compatible = True
16    it_funcs = "('imap'|'ifilter'|'izip'|'izip_longest'|'ifilterfalse')"
17    PATTERN = """
18              power< it='itertools'
19                  trailer<
20                     dot='.' func=%(it_funcs)s > trailer< '(' [any] ')' > >
21              |
22              power< func=%(it_funcs)s trailer< '(' [any] ')' > >
23              """ %(locals())
24
25    # Needs to be run after fix_(map|zip|filter)
26    run_order = 6
27
28    def transform(self, node, results):
29        prefix = None
30        func = results['func'][0]
31        if ('it' in results and
32            func.value not in ('ifilterfalse', 'izip_longest')):
33            dot, it = (results['dot'], results['it'])
34            # Remove the 'itertools'
35            prefix = it.prefix
36            it.remove()
37            # Replace the node which contains ('.', 'function') with the
38            # function (to be consistent with the second part of the pattern)
39            dot.remove()
40            func.parent.replace(func)
41
42        prefix = prefix or func.prefix
43        func.replace(Name(func.value[1:], prefix=prefix))
44