Re: Netscape 'Spidermonkey' JavaScript bi ndings

Warrick Buchanan <Warrick <at> argonaut.com> writes:

> 
> Sorry been busy getting sun burnt in Spain but am back now ;)
> 
> I shall have a look through this stuff now.  I also need to think about how
> JavaScripts prototype object inheritance works some more and how it is best
> exposed - to see how well it would currently fit into the existing
> beginnings of the framework.  Peter have you had any ideas about this?
> 
> Warrick.

I just came back from holiday myself, but have had some time to think on this 
project. I have not thought about inheritance yet. 
I had some ideas on a generic calling convention:

I think we need a generic argument list to hide the Script-specific details of 
the argument list. This may have been discussed already, but still:

If we could have common argument list interface, we could have a common langbind 
 calling mechanism:

Example for functions with 1 argument:
template<>
struct caller<2> {
    template<typename function_type,typename ArgumentListT>
    void_type_return call(function_type function, ArgumentListT& arguments,
free_function_void*)
    {
       function(arguments.a0,arguments.a1)());
       return void_type_return();
    }
    template<typename function_type,typename ArgumentListT>
    ArgumentListT::return_type call(function_type function, ArgumentListT& 
arguments,free_function*)
    {
       return function(arguments.a0,arguments.a1)());
    }
}

where ArgumentListT could be a tuplet of some sort:
template<typename SignatureT>
struct javascript_argument_list
{
  javascript_argument_list(JSContext *cx, JSObject *obj, unsigned int argc, 
jsval *argv, jsval *rval);

}

Then the only function callback we would need to write in order to interface 
with spidermonkey would be:
template<typename SignatureT,unsigned index>
struct function_callback {
    typedef SignatureT::value_type function_type;
    static function_type function;
    
    //Specializations for different call protocols
    static JSBool callback(JSContext *cx, JSObject *obj, unsigned int argc, 
jsval *argv, jsval *rval)
    {
        *rval=wrap(detail::caller<SignatureT::arity>::call(function,
javascript_argument_list<SignatureT>(cx,obj,argc,argv,rval),(SignatureT::
type_tag*)NULL);
        return JS_TRUE;
    }
};

I hope this makes some sense :)

> 
> -----Original Message-----
> From: Daniel Wallin [mailto:dalwan01 <at> student.umu.se]
> Sent: 28 March 2004 02:36
> To: boost-langbinding <at> lists.sourceforge.net
> Subject: Re: [Boost-langbinding] Re: Netscape 'Spidermonkey' JavaScript
> bindings
> 
> 
> Daniel Wallin wrote:
> > David Abrahams wrote:
> > 
> >> <snip>
> >>






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