!747

m {
  static S question = "Is port 80 open?";
  static S answer;
  static Throwable error;
  
  // pattern, class name, method
  static String[][] entries = {
    {"is port * open", "ThePortOracle", "isPort_open"},
    {"what time is it", "TheTimeOracle", "whatTimeIsIt"},
    {"is * java compilable", "TheJavaOracle", "is_JavaCompilable"},
    {"is * java-compilable", "TheJavaOracle", "is_JavaCompilable"},
    {"is * a snippet", "TheSnippetOracle", "is_aSnippet"},
  };
  
  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 class TheTimeOracle {
    static S whatTimeIsIt() {
      return "It is " + new java.text.SimpleDateFormat("HH:mm").format(new Date(now())) + ".";
    }
  }
  
  static class TheJavaOracle {
    static S is_JavaCompilable(S s) {
      boolean b = isJavaCompilable(s);
      // Caveat not needed anymore - now function is actually safe
      /*if (b)
        print("This answer is only 99% safe. (See: #1000888)");*/
      return b ? "Yes." : "No.";
    }
  }
  
  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[]) unquoteAll(m));
      }
    }
    return unknown(question);
  }
  
  static S unknown(S question) {
    return "? Unknown question: " + question;
  }

  p {
    if (args.length != 0)
      question = smartJoin(args);
    print("Q: " + question);
    answer = null;
    error = null;
    
    try {
      answer = answerQuestion(question);
      print("A: " + answer);
    } catch (Throwable e) {
      error = e;
      print(getStackTrace(e));
      print("Internal error!");
    }
  }
  
  static L<S> parse(S s) {
    return tokensToLowerCase(dropPunctuation(javaTokPlusPeriod(s)));
  }
  
  static S smartJoin(S[] args) {
    if (args.length == 1) return args[0];
    
    S[] a = new S[args.length];
    for (int i = 0; i < a.length; i++)
      a[i] = args[i].indexOf(' ') >= 0 ? quote(args[i]) : args[i];
    return join(" ", a);
  }
  
  static S[] unquoteAll(S[] tokens) {
    S[] a = new S[tokens.length];
    for (int i = 0; i < a.length; i++)
      a[i] = unquote(tokens[i]);
    return a;
  }
}

Began life as a copy of #1000886