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"""Fixer that changes unicode to str, unichr to chr, and u"..." into "...".

"""

import re
from ..pgen2 import token
from .import basefix

class FixUnicode(basefix.BaseFix):

  PATTERN = "STRING | NAME<'unicode' | 'unichr'>"

  def transform(self, node, results):
    if node.type == token.NAME:
      if node.value == "unicode":
        new = node.clone()
        new.value = "str"
        return new
      if node.value == "unichr":
        new = node.clone()
        new.value = "chr"
        return new
      # XXX Warn when __unicode__ found?
    elif node.type == token.STRING:
      if re.match(r"[uU][rR]?[\'\"]", node.value):
        new = node.clone()
        new.value = new.value[1:]
        return new