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File: fix_paren.py
"""Fixer that addes parentheses where they are required
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This converts ``[x for x in 1, 2]`` to ``[x for x in (1, 2)]``."""
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# By Taek Joo Kim and Benjamin Peterson
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# Local imports
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from .. import fixer_base
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from ..fixer_util import LParen, RParen
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# XXX This doesn't support nested for loops like [x for x in 1, 2 for x in 1, 2]
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class FixParen(fixer_base.BaseFix):
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BM_compatible = True
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PATTERN = """
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atom< ('[' | '(')
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(listmaker< any
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comp_for<
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'for' NAME 'in'
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target=testlist_safe< any (',' any)+ [',']
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>
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[any]
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>
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>
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|
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testlist_gexp< any
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comp_for<
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'for' NAME 'in'
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target=testlist_safe< any (',' any)+ [',']
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>
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[any]
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>
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>)
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(']' | ')') >
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"""
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def transform(self, node, results):
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target = results["target"]
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lparen = LParen()
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lparen.prefix = target.prefix
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target.prefix = u"" # Make it hug the parentheses
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target.insert_child(0, lparen)
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target.append_child(RParen())
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It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
Function