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Re: [Dltk-dev] How to create a custom view to the debug view?

wang dada wrote:

First thing, DebugEvent.BREAKPOINT is a detail of event, real event kind should be checked on DebugEvent.SUSPEND.
I am trying to use IScriptEvaluationEngine to get code evaluated.
The following is my code, and I put my question in it:
public class ScriptExplorerTreeView extends AbstractDebugView implements ISelectionListener, IDebugEventSetListener, IScriptEvaluationListener{
   public void handleDebugEvents(DebugEvent[] events) {
  for (int i = 0; i < events.length; i++) {
   DebugEvent event = events[i];
   switch (event.getKind()) {
case DebugEvent.BREAKPOINT: *if (event.getSource() instanceof IScriptThread) { //Is this event send by the thread in which users' script executing? How can I determine that?*
This event can be sent by any thread of currently executed program. In many cases this is only one thread.

    IScriptThread source = (IScriptThread) event.getSource();
    try {
   * //Could you please give me an example of how to evoke asyncEvaluate?*
* //asyncEvaluate(String snippet, IScriptStackFrame frame, IScriptEvaluationListener listener) ;* * //What is snippet look like? And what result will be returned? How can I get the right frame?*
You should set null as a frame. String snippet is a code to evaluate, e.g. "expr {$a + $b}", listener is the object that would be notified when evaluation completed, i.e. the method evaluationComplete(IScriptEvaluationResult result). Result gives the IScriptValue instance.

source.getEvaluationEngine().asyncEvaluate("$i",null, (IScriptEvaluationListener)this); } catch (Exception e) {
} }
 public void evaluationComplete(IScriptEvaluationResult result) {
  try {
   IScriptValue value = result.getValue();
  //The value is null. Why?
   if (value!=null) {
System.out.println("The result is: "+value.getValueString()); } else {
    System.out.println("The result is null");
  } catch (Exception e) {
} }
Is there any thing wrong with this code? Thanks for your time.
Best regards,
Message: 1
Date: Thu, 02 Aug 2007 12:10:33 +0700
From: Dmitriy Kovalev <kds@xxxxxxxxx>
Subject: Re: [Dltk-dev] How to create a custom view to the debug view?
To: DLTK Developer Discussions <dltk-dev@xxxxxxxxxxx>
Message-ID: <46B16749.2040901@xxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed


This link is a good
source of Eclipse debugger documentation. Presentations of two last
EclipseConfs (with source examples) are very useful and explain
practically all parts of Eclipse debug infrastructure with many details.

Eclipse has a common model of debug objects (threads, stack frames and
etc.). Our debug model extends Eclipse model and implements many script
language specific things using DBGP protocol. The main interfaces are:
IScriptThread, IScriptStackFrame, IScriptVariable, IScriptValue. See the
source code for more information.

I think your problem can be solved in the following way. The first thing
you should investigate is the IDebugEventSetListener. Your class may
implement this interface to listen debug events (class DebugEvent).
These events give a complete information about debugging process: when
suspends, why it suspends (end of step or breakpoint) and etc.
DebugEvent has a good javadoc, read it first. So, you can  detect the
moment when your view should be shown.

Adding information about objects is more complex but realizable task. I
think you should use IScriptEvaluationEngine. This interface allow you
to execute any code (in this case Tcl code) in the application thread
and obtain results as instance of IScriptValue. Evaluation engine
interface can be requested through IScriptThread (method
getEvaluationEgine). Instance of IScriptThread  can be simply extracted
from DebugEvent.

This is a short outline of possible solution. Please, ask additional
questions for more information.

Dmitriy Kovalev

wang dada wrote:
> Hi,
> Recently I've been studying the debugger of Dltk. What I want to do is
> adding a custom view to the DebugView, let's say it to be
> CustomObjectView.
> When users' scripte suspend at the breakpoint, CustomObjectView will
> show all the objects created by now. These objects has no
> relation with Tcl lanuage, they are just the bussiness objects created
> by users.
> For example, users script will be like this:  set i [test::newobject1]
> set
> j [test::new object2]
> > test::new relationship -parent i j
> And I can get all the objects by using:  test::get all to get all
> the created objects and their relations, and show them in
> CustomObjectView with a treeViewer. When user click step,
> CustomObjectView will refresh.
> > Could anyone give me some clue or example code to realize it? I've
> read articles at,
> but still do not know how to begin. Is there any documents about how
> to realizing debugger of DLTK? Any advise and help will be greatly
> appreciated.
> > Best regards,
> Joy
> >
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