!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.";
    }
  }
  
  // pattern, class name, method
  static String[][] entries = {
    {"is port * open", "ThePortOracle", "isPort_open"}
  };
  
  static S answerQuestion(S question) {
    L<S> tok = parse(question);
    
    for (S[] e : entries) {
      S[] m = match2(parse(e[0]), tok);
      if (m != null) ctex {
        Class c = Class.forName("main$" + e[1]);
        return "" + call(c, e[2], (Object[]) m);
      }
    }
    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)));
  }
}