Subj : Re: parsing tree of javascript expression using Rhino
To   : christos.toyas
From : Igor Bukanov
Date : Wed Nov 24 2004 11:16 am

Christos Toyas wrote:
> Hi,
> 
> I was wondering if there was a way with Rhino to get back a parsing tree 
> from a javascript string.

Rhino does not have public API for doing that.

> 
> I'd like to know for example what are the used
> functions in my javascript string and what are the args
> provided to those functions.

In Rhino 1.6R1 which currently exists in the form of the third release 
candidate you can do it via debug API and Context.compileString:

import org.mozilla.javascript.*;
import org.mozilla.javascript.debug.DebuggableScript;

....

Context cx;
.....
// Force interpretation mode to make results of
// Context.compileString debuggable
cx.setOptimizationLevel(-1);

Script script = cx.compileString(stringWithScriptText, "someName", 1, null);

DebuggableScript dscript = Context.getDebuggableView(script);

// Enumerate top level functions
for (int i = 0; i != dscript.getFunctionCount(); ++i) {
	System.out.println("Function: "+dscript.getFunction(i));
	System.out.println("  its param count: 
"+dscript.getFunction(i).getParamCount());
	...
}


Regards, Igor

.