!747

m {
  static S[] args;
  
  p {
    main.args = args;
    makeAndroid("This is a JavaX VM talking to you.", stringfunc {
      answer(s)
    });
  }
  
  static synchronized S answer(S s) {
    new Matches m;
    
    if (match3("kill!", s)) {
      killMyself();
      return "ok";
    }
    if (match3("What is your process ID?", s) || match3("what is your pid?", s))
      return getPID();
    if (match3("what is your program id?", s))
      return getProgramID();
    if (match3("what are your program arguments?", s))
      return structure(args);
    if (match3("get fields of main class", s))
      return structure(listFields(main.class));
    if (match3("get field * of main class", s, m))
      return structure(get(main.class, m.m[0]));
    if (match3("invoke function * of main class", s, m))
      return structure(call(main.class, m.m[0]));
    if (match3("set field * of main class to *", s, m)) {
      set(main.class, m.m[0], unstructure(m.m[1]));
      return "ok";
    }
    if (match3("how much memory are you consuming", s))
      return "Java heap size: " + (Runtime.getRuntime().totalMemory()+1024*1024-1)/1024/1024 + " MB";
    if (match3("how much memory is used after GC?", s)) {
      System.gc();
      return "Java heap used: " + (Runtime.getRuntime().totalMemory()-Runtime.getRuntime().freeMemory()+1024*1024-1)/1024/1024 + " MB";
    }
    if (match3("how much memory is used?", s))
      return "Java heap used: " + (Runtime.getRuntime().totalMemory()-Runtime.getRuntime().freeMemory()+1024*1024-1)/1024/1024 + " MB";
    return null;
  }
}