docs: def p_static_scalar(p):
      '''static_scalar : common_scalar
                       | QUOTE QUOTE
                       | QUOTE ENCAPSED_AND_WHITESPACE QUOTE'''
      if len(p) == 2:
          p[0] = p[1]
      elif len(p) == 3:
          p[0] = ''
      else:
          p[0] = p[2].decode('string_escape')