""" Fixer for imports of itertools.(imap|ifilter|izip|ifilterfalse) """

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# Local imports

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from lib2to3 import fixer_base

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from lib2to3.fixer_util import BlankLine, syms, token

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class FixItertoolsImports(fixer_base.BaseFix):

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BM_compatible = True

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PATTERN = """

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import_from< 'from' 'itertools' 'import' imports=any >

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""" %(locals())

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def transform(self, node, results):

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imports = results['imports']

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if imports.type == syms.import_as_name or not imports.children:

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children = [imports]

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else:

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children = imports.children

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for child in children[::2]:

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if child.type == token.NAME:

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member = child.value

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name_node = child

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elif child.type == token.STAR:

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# Just leave the import as is.

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return

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else:

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assert child.type == syms.import_as_name

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name_node = child.children[0]

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member_name = name_node.value

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if member_name in ('imap', 'izip', 'ifilter'):

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child.value = None

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child.remove()

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elif member_name in ('ifilterfalse', 'izip_longest'):

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node.changed()

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name_node.value = ('filterfalse' if member_name[1] == 'f'

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else 'zip_longest')

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# Make sure the import statement is still sane

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children = imports.children[:] or [imports]

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remove_comma = True

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for child in children:

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if remove_comma and child.type == token.COMMA:

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child.remove()

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else:

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remove_comma ^= True

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while children and children[-1].type == token.COMMA:

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children.pop().remove()

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# If there are no imports left, just get rid of the entire statement

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if (not (imports.children or getattr(imports, 'value', None)) or

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imports.parent is None):

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p = node.prefix

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node = BlankLine()

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node.prefix = p

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return node

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