docs: def p_invoke(p):
      """
      invoke : INVOKE IDENTIFIER SLASH IDENTIFIER
             | INVOKE IDENTIFIER SLASH IDENTIFIER OPEN_CURLY_BRACKET PRIORITY COLON NUMBER CLOSE_CURLY_BRACKET
      """
      priority = None
      if len(p) > 5:
          priority = int(p[8])
      p[0] = Trigger(p[2], p[4], priority)