import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

import parsing.Parser;
import parsing.ParsingException;

public class Main extends MIDlet implements CommandListener {

 public TextField code = new TextField("Code:", new String(), 500, TextField.ANY);
 public Form console = new Form("Console:");
 public Command ok, back, exit;
 public Display display;
 public String codeToParse;

 public void startApp() {
  if(display==null) initApp();
 }

 public void initApp(){
  try{
   display = Display.getDisplay(this);
   code = new TextField("Code: ", new String(), 500, TextField.ANY);
   ok = new Command("Ok", Command.OK, 0);
   exit = new Command("Exit", Command.EXIT, 0);
   console = new Form("Console: ");
   console.append(code);
   console.addCommand(ok);
   console.addCommand(back);
   console.setCommandListener(this);
   display.setCurrent(console);
  }catch(Throwable t){
   Alert a = new Alert(t.toString(), t.getMessage(), null, null);
   a.setTimeout(5000);
   Display.getDisplay(this).setCurrent(a);
   a = null;
   System.gc();
  }
 }

 public void pauseApp() {
 }

 public void commandAction(Command c, Displayable d){
  if(c==ok){
   try{
    if(code.getString().toCharArray().length<1){
     throw new ParsingException("null input");
    }
    codeToParse = code.getString();
    Parser parser = new Parser(codeToParse);
    String s = parser.parse();
    Form log = new Form("Log:");
    log.append(s);
    log.addCommand(back);
    log.setCommandListener(this);
    display.setCurrent(log);
    log = null;
    System.gc();
   }catch(Throwable t){
    Alert a = new Alert(t.toString(), t.getMessage(), null, null);
    a.setTimeout(50000);
    display.setCurrent(a);
    display.setCurrent(console);
   }
  }else if(c==exit){
   destroyApp(true);
  }else if(c==back){
   display.setCurrent(console);
  }
 }

 public void destroyApp(boolean unconditional) {
  if(unconditional){
   console = null;
   ok = null;
   back = null;
   exit = null;
   code = null;
   codeToParse = null;
   display = null;
   System.gc();
   notifyDestroyed();
  }
 }
}