Hello, I'm pretty new to JavaScriptCore. I hope this is the right place for questions about it.
I'm trying to figure out the JavaScriptCore API. For my own object types, is it possible to define my own custom behavior for equality comparisons (presumably ===)? I've been looking at JSClassDefinition, specifically "getProperty". I've also been looking at JSObjectSetPrototype(). For some reason, I got it in my head (finding small, but incomplete snippets of code via searches) that these would be what I need to modify to hook into the equality operator. However, my experiments in actually making these values do something have yielded nothing, and I have been unable to find any clear examples doing what I'm trying to do. So to give you some context about what I'm doing (and my mindset), I am trying to bind some C libraries to JavaScriptCore for a native app so I can script stuff in Javascript. I am fairly new to Javascript, so to help me, I've been using the experimental branch of SWIG to generate JavaScriptCore bindings. However, the SWIG generator is incomplete, so I have been forced to get my hands dirty and fix or implement pieces in the SWIG/JSC generator itself. The current problem I'm trying to solve is that when a C object instance crosses into Javascript, JSObjectMake() + JSObjectSetPrivate(jsobject, c_object) is always used to associate the Javascript object instance with the C object instance. The problem arises when the same C instance gets pushed into Javascript from multiple places. JSObjectMake() creates a distint Javascript object even though the underlying C pointer is identical. So in Javascript, var object1 = Foo.CreateObject(); var object2 = Foo.ReturnSameObject(object1); (object1 == object2) or (object1 === object2) always return false, even though I really want them to return true. So hence, my question about customizing === for my objects. (If possible, my intention is to add this support to the SWIG generator.) But this raises a second question. Is it possible to check to see if a Javascript proxy object already exists and return (push) that one, instead of calling JSObjectMake() to create a brand new object? This would be nice so I could use == instead of ===, and also has the benefit of not generating as much potential garbage that needs to be collected. To give a little more context, I have a Lua background and know its C API pretty well. So I've been looking for mechanisms like doing push/pop operations on a virtual stack and store/retrieve private things in the registry (with weak references). So far I'm finding nothing that resembles this so I'm hoping for some examples/guidance that set me on the correct path. Thanks, Eric -- Beginning iPhone Games Development http://playcontrol.net/iphonegamebook/ _______________________________________________ webkit-help mailing list webkit-help@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-help
