"""Optional fixer that changes all unprefixed string literals "..." to b"...".
br'abcd' is a SyntaxError on Python 2 but valid on Python 3.
ur'abcd' is a SyntaxError on Python 3 but valid on Python 2.
"""
from __future__ import unicode_literals
import re
from lib2to3.pgen2 import token
from lib2to3 import fixer_base
_literal_re = re.compile(r"[^bBuUrR]?[\'\"]")
class FixBytes(fixer_base.BaseFix):
BM_compatible = True
PATTERN = "STRING"
def transform(self, node, results):
if node.type == token.STRING:
if _literal_re.match(node.value):
new = node.clone()
new.value = u'b' + new.value
return new
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