!747

m {

  static S question = "Is port 80 open?";

  static class ThePortOracle {

    static S isPort_open(S s) {

      int port = parseInt(s);

      print("I'll check port " + port + "..."); 

      boolean b = isPortOpen(port);

      return b ? "Yes, it is open!" : "No, it is not open.";

    }

  }

  static S answerQuestion(S question) {

    L<S> tok = parse(question);

    S[] m = match2(parse("is port * open"), tok);

    if (m != null) return ThePortOracle.isPort_open(m[0]);

    return unknown(question);

  }

  static S unknown(S question) {

    return "? Unknown question: " + question;

  }

  p {

    if (args.length != 0)

      question = join(" ", args);

    print("Q: " + question);

    S answer = answerQuestion(question);

    print("A: " + answer);

  }

  static L<S> parse(S s) {

    return tokensToLowerCase(dropPunctuation(javaTokPlusPeriod(s)));

  }

}