Subj : Re: generic getter for more than 256 properties
To   : Brann Joly
From : Brendan Eich
Date : Wed May 12 2004 10:46 am

Brann Joly wrote:
>>The id passed to a JSPropertyOp (getProperty, setProperty in JSClass)
>>comes from the name parameter to JS_DefineProperty, etc. (the property
>>defining APIs that lack the "WithTinyId" suffix in their names).  When
>>you define a normal property, there is no tinyid.  When you define a
>>property with a tinyid, the tinyid, tagged as an int jsval, gets passed
>>to your JSPropertyOps.
> 
> 
> How do u convert the name into an int? i can't find anything about that in
> the documentation:(


You have to hash the jsval, which could be int- or string-tagged, 
yourself.  See jshash.h and jsdhash.h, read the comments in the latter 
to decide which hashtable you want to use.


> I plan to write a small tutorial on generic wrappers/getters/setters when
> i'm done with my project, since I feel like documentation on this particular
> topic is really missing :(


Yes, this is something that has been done before (XPConnect, PyXPCOM, a 
few others) by people who knew the way to go, and didn't get misled by 
tinyids.  The docs should be better.

/be

.