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57 lines
2 KiB
Python
57 lines
2 KiB
Python
""" 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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