code: def _string_literal_to_string(string_literal_token):
      
      token_text = string_literal_token.getText()
      return token_text[1:-1].replace(u"\\'", u"'"). \
          replace(u"\\\\", u"\\")
docs: Converts the StringLiteral token to a plain string: get text content,
      removes quote characters, and unescapes it.
  
      :param string_literal_token: The string literal
      :return: