Subj : Re: Compacting JS source via ParseTree or Decompile
To   : netscape.public.mozilla.jseng
From : Dan Libby
Date : Tue Jun 08 2004 10:44 pm

Okay, I think I've got the loop for the getting the function arguments 
worked out using OBJ_SCOPE, etc.  But I can't call it.  I'm still 
clueless how to actually get the function objects in the first place.  I 
feel I'm missing something obvious.

:(

Brendan Eich wrote:
> 
> JS_Enumerate is for enumerable properties only.  Also, until you execute 
> the script (or at least its prolog, see JS_ExecuteScriptPart), you won't 
> see any properties defined by it in the object you passed in as the obj 
> param when compiling it.
> 
>> // Iterate through vars in function
>> void shorten_function_vars(JSContext* cx, JSFunction* fun) {
>>     JSIdArray* ida = JS_Enumerate( cx, fun->object );
>>     if( ida ) {
>>         jsval* val;
>>         int i;
>>         for(i = 0; i < ida->length; i++ ) {
>>             if( JS_TRUE == JS_GetElement(cx, fun->object, 
>> ida->vector[i], val) ) {
>>                 JSType type = JS_TypeOfValue(cx, *val);
> 
> 
> You don't really need the value -- you rather want to munge the id.
> 
> And you will be using friend and (until we make more friend APIs) 
> private APIs to do this.  So, you don't want JS_Enumerate, again.  You 
> should instead loop from OBJ_SCOPE(fun->object)->lastProp following 
> parent links until null, testing for getter == js_GetLocalVariable || 
> getter == js_GetArgument.
> 
>> Yes, arguments could/should be renamed (assuming JS only supports 
>> positional arguments).
> 
> 
> Right, JS2 adds named parameter passing.

Hmm.  So how can I check if the script is JS2 or not?

> 
> /be

.