[v8-users] Re: Property Interceptors - anything similar for functions?
Thanks Stephen! On Jul 16, 4:30 pm, Stephan Beal sgb...@googlemail.com wrote: On Thu, Jul 16, 2009 at 9:56 PM, Ravi chinn...@yahoo.com wrote: Using Interceptors, is there anyway to figure out the arguments 'arg1' and 'arg2' on 'method1', or will I have to add a function callback after knowing (in the interceptor) that it's trying to invoke a method called 'method1'. The interceptors never see the arguments. The call: obj.method(arg1,arg2) is logically a few different parts: a) call interceptor for obj['method']. This part you can intercept in client code. b) Ensure that the property is-a callable type. If not, throw an error. c) Evaluate the arguments (in an unspecified order, AFAIK) and push them onto an arguments list. d) call the result of (a), passing it the arguments list. To intercept part (d) you have to (re)implement the function pointed to by obj.method. -- - stephan bealhttp://wanderinghorse.net/home/stephan/ --~--~-~--~~~---~--~~ v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users -~--~~~~--~~--~--~---
[v8-users] Re: Property Interceptors - anything similar for functions?
A method is nothing but a property with a function as value.
So you can do:
object_template-Set(
f, FunctionTemplate::New(callback)-GetFunction());
or with a property accessor:
HandleValue return_data(LocalString property, const AccessorInfo info) {
return info.Data();
}
object_template-SetAccessor(
String::New(f),
return_data, NULL,
FunctionTemplate::New(callback)-GetFunction());
Matthias
On Thu, Jul 16, 2009 at 5:06 PM, Ravichinn...@yahoo.com wrote:
Hi,
The property interceptors provide a way to handle any object property
with a callback. I was wondering if there is something similar to
handle any object method.
Thank you,
Ravi
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[v8-users] Re: Property Interceptors - anything similar for functions?
Thanks Stephan. Interceptors do seem to handle functions, but, I couldn't figure out a way to access the function arguments. I wish there were an example for such a scenario. On Jul 16, 11:22 am, Stephan Beal sgb...@googlemail.com wrote: On Thu, Jul 16, 2009 at 5:06 PM, Ravi chinn...@yahoo.com wrote: The property interceptors provide a way to handle any object property with a callback. I was wondering if there is something similar to handle any object method. In theory, since a method is-a property, methods can also be handled via interceptors. i haven't tried it, but since JS does not syntactically differentiate between (a.b = c) based on the types of a.b and c, then interceptors should work on methods in the same way they work on non-method members. In theory, of course. -- - stephan bealhttp://wanderinghorse.net/home/stephan/ --~--~-~--~~~---~--~~ v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users -~--~~~~--~~--~--~---
[v8-users] Re: Property Interceptors - anything similar for functions?
The interceptor just returns the function, you aren't calling the function. The arguments come in when you call the function. On Thu, Jul 16, 2009 at 5:39 PM, Ravichinn...@yahoo.com wrote: Thanks Stephan. Interceptors do seem to handle functions, but, I couldn't figure out a way to access the function arguments. I wish there were an example for such a scenario. On Jul 16, 11:22 am, Stephan Beal sgb...@googlemail.com wrote: On Thu, Jul 16, 2009 at 5:06 PM, Ravi chinn...@yahoo.com wrote: The property interceptors provide a way to handle any object property with a callback. I was wondering if there is something similar to handle any object method. In theory, since a method is-a property, methods can also be handled via interceptors. i haven't tried it, but since JS does not syntactically differentiate between (a.b = c) based on the types of a.b and c, then interceptors should work on methods in the same way they work on non-method members. In theory, of course. -- - stephan bealhttp://wanderinghorse.net/home/stephan/ --~--~-~--~~~---~--~~ v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users -~--~~~~--~~--~--~---
[v8-users] Re: Property Interceptors - anything similar for functions?
Thanks Dean. The scenario I'm working on is: having a generic handler to capture all the property and method calls on an object. For example, let's say an object Obj is being used in javaScript, I'd like to capture and record any operation on that Obj, like var a = Obj.A document.write(a) Obj.method1(arg1, arg2); Obj.b = 2; . Here, I do not know the names of Obj's properties/methods ahead. I'd simply like to know that the script accessed Obj property 'A', invoked 'method1' on Obj with arguments 'arg1' and 'arg2', and set the property 'b'. Using Interceptors, is there anyway to figure out the arguments 'arg1' and 'arg2' on 'method1', or will I have to add a function callback after knowing (in the interceptor) that it's trying to invoke a method called 'method1'. Thank you. On Jul 16, 11:49 am, Dean McNamee de...@chromium.org wrote: The interceptor just returns the function, you aren't calling the function. The arguments come in when you call the function. On Thu, Jul 16, 2009 at 5:39 PM, Ravichinn...@yahoo.com wrote: Thanks Stephan. Interceptors do seem to handle functions, but, I couldn't figure out a way to access the function arguments. I wish there were an example for such a scenario. On Jul 16, 11:22 am, Stephan Beal sgb...@googlemail.com wrote: On Thu, Jul 16, 2009 at 5:06 PM, Ravi chinn...@yahoo.com wrote: The property interceptors provide a way to handle any object property with a callback. I was wondering if there is something similar to handle any object method. In theory, since a method is-a property, methods can also be handled via interceptors. i haven't tried it, but since JS does not syntactically differentiate between (a.b = c) based on the types of a.b and c, then interceptors should work on methods in the same way they work on non-method members. In theory, of course. -- - stephan bealhttp://wanderinghorse.net/home/stephan/- Hide quoted text - - Show quoted text - --~--~-~--~~~---~--~~ v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users -~--~~~~--~~--~--~---
