"""Fixer that changes 'a ,b' into 'a, b'.
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This also changes '{a :b}' into '{a: b}', but does not touch other
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uses of colons. It does not touch other uses of whitespace.
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"""
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from .. import pytree
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from ..pgen2 import token
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from .. import fixer_base
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class FixWsComma(fixer_base.BaseFix):
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explicit = True # The user must ask for this fixers
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PATTERN = """
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any<(not(',') any)+ ',' ((not(',') any)+ ',')* [not(',') any]>
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"""
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COMMA = pytree.Leaf(token.COMMA, u",")
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COLON = pytree.Leaf(token.COLON, u":")
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SEPS = (COMMA, COLON)
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def transform(self, node, results):
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new = node.clone()
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comma = False
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for child in new.children:
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if child in self.SEPS:
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prefix = child.prefix
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if prefix.isspace() and u"\n" not in prefix:
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child.prefix = u""
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comma = True
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else:
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if comma:
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prefix = child.prefix
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if not prefix:
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child.prefix = u" "
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comma = False
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return new
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