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"""Fixer to change b('string') into b'string'."""
# Author: Daniele Varrazzo
import token
from lib2to3 import fixer_base
from lib2to3.pytree import Leaf
class FixB(fixer_base.BaseFix):
PATTERN = """
power< wrapper='b' trailer< '(' arg=[any] ')' > rest=any* >
"""
def transform(self, node, results):
arg = results['arg']
wrapper = results["wrapper"]
if len(arg) == 1 and arg[0].type == token.STRING:
b = Leaf(token.STRING, 'b' + arg[0].value, prefix=wrapper.prefix)
node.children = [ b ] + results['rest']
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