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svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r77855 | benjamin.peterson | 2010-01-30 17:32:05 +0100 (Sa, 30 Jan 2010) | 1 line don't return node if it is not changed ........ r77856 | benjamin.peterson | 2010-01-30 17:35:29 +0100 (Sa, 30 Jan 2010) | 1 line return None to indicate no change ........ r77870 | benjamin.peterson | 2010-01-31 02:21:26 +0100 (So, 31 Jan 2010) | 1 line never return the original node given to transform() ........
52 lines
1.8 KiB
Python
52 lines
1.8 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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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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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 (u'imap', u'izip', u'ifilter'):
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child.value = None
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child.remove()
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elif member_name == u'ifilterfalse':
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node.changed()
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name_node.value = u'filterfalse'
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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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if children[-1].type == token.COMMA:
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children[-1].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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