package net.sourceforge.phpdt.internal.debug.core.watch;

import net.sourceforge.phpdt.internal.debug.core.PHPDBGProxy;
import net.sourceforge.phpdt.internal.debug.core.model.PHPDebugTarget;
import net.sourceforge.phpdt.internal.debug.core.model.PHPStackFrame;
import net.sourceforge.phpdt.internal.debug.core.model.PHPVariable;

import org.eclipse.debug.core.model.IDebugElement;
import org.eclipse.debug.core.model.IWatchExpressionDelegate;
import org.eclipse.debug.core.model.IWatchExpressionListener;
import org.eclipse.debug.core.model.IWatchExpressionResult;

public class PHPWatchExpressionDelegate implements IWatchExpressionDelegate {

       public void evaluateExpression(String expression, IDebugElement context,
                       IWatchExpressionListener listener) {
               IWatchExpressionResult x;
               PHPDBGProxy dbg=((PHPDebugTarget)context.getDebugTarget()).getPHPDBGProxy();
               PHPStackFrame s=null;
               if(context instanceof PHPStackFrame)
                       s=(PHPStackFrame)context;
               try{
               PHPVariable result[]=dbg.eval(s,expression);
               if(result.length==0)
                       x=new PHPWatchExpressionResult(expression,null,null);
               else
                       x=new PHPWatchExpressionResult(expression,result[0].getValue(),null);
               }
               catch(Exception e)
               {
                       String[] s1=new String[1];
                       s1[0]=e.toString();
               x=new PHPWatchExpressionResult(expression,null,s1);
               }
               listener.watchEvaluationFinished(x);
       }

}