Dear Mads,,
You solved the problem which puzzle for days! I am extremely grateful!
I once thought there was binding when returning from getter.
After I change the Getter to like follows, it works!
else
{
printf("property not defined before\n");
info.Holder()->Set(propertyName, v8::True());
return v8::True();
}
Wishes~
Xiang
On Wed, Dec 2, 2009 at 4:41 PM, Mads Ager <[email protected]> wrote:
> You never set the valueFromInterceptor property on any object.
> Therefore, GetRealNamedPropertyInPrototypeChain can never find that
> property and therefore the interceptor will do the same no matter how
> many times you call it.
>
> Cheers, -- Mads
>
> On Wed, Dec 2, 2009 at 4:57 AM, Xiang Zhong <[email protected]> wrote:
> > Hi, All,
> >
> > When using Object:: GetRealNamedPropertyInPrototypeChain(), it seems it
> > can't find already existed named property.
> >
> > There are two objects involved:
> > o0 <--Define a named inteceptor for o0
> > ^
> > | prototype
> > |
> > o1
> > In the inteceptor of o0, I will check whether this property is defined
> > already.
> > When running script "o1.valueFromInteceptor; o1.valueFromInteceptor;", I
> > expect
> > When first try to
> > resolve o1.valueFromInteceptor, GetRealNamedPropertyInPrototypeChain()
> > should return empty
> > But second try to resolve o1.valueFromInteceptor,
> > GetRealNamedPropertyInPrototypeChain() should not return empty.
> > The sample is below:
> > Expected behavior should be:
> > property not defined before
> > property defined before
> >
> > Now is:
> > property not defined before
> > property not defined before
> >
> >
> > #include <v8.h>
> > #include <iostream>
> > using namespace v8;
> > v8::Handle<v8::Value> Getter(v8::Local<v8::String> propertyName,const
> > v8::AccessorInfo &info) {
> > v8::HandleScope handleScope;
> > v8::Handle<v8::Value> v =
> > info.This()->GetRealNamedPropertyInPrototypeChain(propertyName);
> > if (!v.IsEmpty()) {
> > printf("property defined before\n");
> > return v8::False();
> > }
> > else
> > {
> > printf("property not defined before\n");
> > return v8::True();
> > }
> > }
> > int main()
> > {
> > HandleScope handleScope;
> >
> > Persistent<Context> context = Context::New();
> > Context::Scope contextScope(context);
> >
> > Handle<FunctionTemplate> t0 = FunctionTemplate::New();
> > t0->InstanceTemplate()->SetNamedPropertyHandler(Getter);
> > Handle<FunctionTemplate> t1 = FunctionTemplate::New();
> > Local<v8::Object> o0 = t0->GetFunction()->NewInstance();
> > Local<v8::Object> o1 = t1->GetFunction()->NewInstance();
> >
> > o1->Set(v8::String::New("__proto__"), o0);
> > context->Global()->Set(v8::String::New("o0"), o0);
> > context->Global()->Set(v8::String::New("o1"), o1);
> >
> > Handle<Script> script =
> > Script::Compile(v8::String::New("o1.valueFromInteceptor;
> > o1.valueFromInteceptor;"));
> > Handle<Value> result = script->Run();
> > context.Dispose();
> > return 0;
> > }
> >
> >
> > I am not sure whether I miss something or use it in wrong way.
> > I appreciate if you can correct me.
> >
> >
> > Cheers~
> > Xiang
> >
> > --
> > v8-dev mailing list
> > [email protected]
> > http://groups.google.com/group/v8-dev
>
> --
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