Interceptors running under "with"

[Danny Dorfman]

Hello there,

Is there a way for my interceptor to know that it's running under "with", as in this example:

var a = 10;

with (new CONS()) { do_something(a); }

The problem is, that 'a' is intercepted by the new object, and is rendered undefined. I would like it to use the external 'a' instead.

Regards,

Danny

[Zac Hansen]

Are you using the objecttemplate's setnamedpropertyhandler call?  if so, are you implementing all the callbacks to say that your CONS object doesn't have a property a?

[Danny Dorfman]

Yes, I use SetNamedPropertyHandler. However, I'd like to make the following distinction:

If I am not inside "using", the handler for "a" should return v8::Undefined (or some other preset value).

If I am inside "using", the handler should not return anything at all, and let V8 determine the value.

Is that possible?

[Zac Hansen]

I don't know for sure, but if you don't tell the interceptor that a isn't a property on CONS, then it thinks it is and then it finds cons_object.a but then you don't have a value for it, so it returns undefined.   

Have you fully implemented all 5 of the callbacks for setnamedpropertyhandler?  maybe even just put some print statements in them to see which are called when and for what property names.  

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[Danny Dorfman]

I just implemented all the callbacks, and I see that for "with" there are calls to QueryProperty, which are not present in the no-with scenario.

Maybe I can take it from there. Thanks for the idea!

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[Zac Hansen]

from the docs:

http://v8.paulfryzel.com/docs/master/namespacev8.html#ac135beae5f0c8b290255accb438f990e

 Returns a non-empty handle if the interceptor intercepts the request 

so make sure you are returning an empty handle for properties your object shouldn't respond to.

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