40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
"""
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For the ``future`` package.
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Adds this import line:
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from past.builtins import str as oldstr
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at the top and wraps any unadorned string literals 'abc' or explicit byte-string
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literals b'abc' in oldstr() calls so the code has the same behaviour on Py3 as
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on Py2.6/2.7.
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"""
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from __future__ import unicode_literals
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import re
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from lib2to3 import fixer_base
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from lib2to3.pgen2 import token
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from lib2to3.fixer_util import syms
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from libfuturize.fixer_util import (future_import, touch_import_top,
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wrap_in_fn_call)
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_literal_re = re.compile(r"[^uUrR]?[\'\"]")
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class FixOldstrWrap(fixer_base.BaseFix):
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BM_compatible = True
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PATTERN = "STRING"
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def transform(self, node, results):
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if node.type == token.STRING:
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touch_import_top(u'past.types', u'oldstr', node)
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if _literal_re.match(node.value):
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new = node.clone()
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# Strip any leading space or comments:
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# TODO: check: do we really want to do this?
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new.prefix = u''
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new.value = u'b' + new.value
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wrapped = wrap_in_fn_call("oldstr", [new], prefix=node.prefix)
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return wrapped
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