mirror of https://github.com/python/cpython
53 lines
1.6 KiB
Python
53 lines
1.6 KiB
Python
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# Copyright 2008 Armin Ronacher.
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# Licensed to PSF under a Contributor Agreement.
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"""Fixer that cleans up a tuple argument to isinstance after the tokens
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in it were fixed. This is mainly used to remove double occurrences of
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tokens as a leftover of the long -> int / unicode -> str conversion.
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eg. isinstance(x, (int, long)) -> isinstance(x, (int, int))
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-> isinstance(x, int)
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"""
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from .. import fixer_base
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from ..fixer_util import token
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class FixIsinstance(fixer_base.BaseFix):
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PATTERN = """
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power<
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'isinstance'
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trailer< '(' arglist< any ',' atom< '('
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args=testlist_gexp< any+ >
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')' > > ')' >
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>
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"""
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run_order = 6
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def transform(self, node, results):
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names_inserted = set()
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testlist = results["args"]
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args = testlist.children
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new_args = []
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iterator = enumerate(args)
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for idx, arg in iterator:
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if arg.type == token.NAME and arg.value in names_inserted:
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if idx < len(args) - 1 and args[idx + 1].type == token.COMMA:
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next(iterator)
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continue
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else:
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new_args.append(arg)
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if arg.type == token.NAME:
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names_inserted.add(arg.value)
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if new_args and new_args[-1].type == token.COMMA:
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del new_args[-1]
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if len(new_args) == 1:
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atom = testlist.parent
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new_args[0].set_prefix(atom.get_prefix())
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atom.replace(new_args[0])
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else:
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args[:] = new_args
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node.changed()
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