Subj : Re: Retrieving property  name in getter and setter functions
To   : netscape.public.mozilla.jseng
From : Eric Brueggemann <eric_brueggemann@yahoo.com>
Date : Fri May 09 2003 12:04 pm

Brendan Eich wrote:
> JZ wrote:
> 

<*snip*>

 >
>> Now, how in my AW_JS_Get function can I retrieve the name of the property
>> that has been executed in the users JavaScript?
>>
>> static JSBool AW_JS_Get(JSContext *cx, JSObject *obj, jsval id, jsval 
>> *rval)
>> {
>>    // need to get the name of the property here
>> }
>>  
>>
> 
> if (JSVAL_IS_INT(id)) then the property identifier is JSVAL_TO_INT(id) 
> -- an integer index.  Otherwise, you can asset that JSVAL_IS_STRING(id), 
> and JSVAL_TO_STRING(id) can be passed to JS_GetStringChars and 
> JS_GetStringLength to look at the string's characters.
>

Actually, that's not always safe. Since a call to js_Atomize uses 
temporary space to inflate bytes into wide chars, 
JSVAL_TO_STRING(id)->chars may no longer exist when the id makes it into 
your getter/setter.

The above assertion would be extremely helpful if it were reliable, but 
it isn't always the case. Any way of fixing this?

Cheers,

Eric

.