You can use built-in Function constructor:
v8::Local<v8::Function> MkFunction(v8::Handle<v8::String> body) {
v8::HandleScope scope;
// Get global object
v8::Local<v8::Object> global = v8::Context::GetCurrent()->Global();
// Get built-in Function constructor (see ECMA-262 5th edition 15.3.2)
v8::Local<v8::Function> function_ctor =
v8::Local<v8::Function>::Cast(global->Get(v8::String::New("Function")));
// Invoke Function constructor to create function with the given
body and no arguments
v8::Handle<v8::Value> argv[1] = { body };
v8::Local<v8::Object> function = function_ctor->NewInstance(1, argv);
return scope.Close(v8::Local<v8::Function>::Cast(function));
}
--
Vyacheslav Egorov, Software Engineer, V8 Team.
Google Denmark ApS.
On Thu, Mar 10, 2011 at 5:40 PM, Vasily <vasily.stepa...@gmail.com> wrote:
> Consider a v8::String variable containing some js code.
> For instance:
> v8::Local<v8::String> source = v8::String::New("this.foo();");
>
> I want to evaluate js code with my explicitly defined 'this' keyword.
> First of all I found v8::Function::Call() method. Where I can pass
> 'this' object with recv argument (sic).
>
> My idea was to create v8::Function:
> v8::Local<v8::FunctionTemplate> templ =
> v8::FunctionTemplate::New(eval, source);
> v8::Local<v8::Function> function = templ->GetFunction();
>
> where eval is:
> v8::Handle<v8::Value> eval(const v8::Arguments &args) {
> v8::Handle<v8::String> source =
> v8::Handle<v8::String>::Cast(args.Data());
> // I'm not talking about performance here. It's not a real life ;)
> v8::Local<v8::Script> script = v8::Script::Compile(source);
> script->Run();
> return v8::Undefined();
> }
>
> and call this function like this:
> function->Call(myObj, 0, NULL);
>
> But what I found is that inside eval, args.This() points to my object
> (and that is good)... unfortunately inside script->Run() in expression
> "this.foo()", 'this' means Global object of a current context. And
> that is probably what expected by v8 developers... but definitely not
> good for me :)
>
> My dirty solution is to build "function() { " + source + "}" string,
> Compile, Run and Cast the result to v8::Function.
>
> Is there any clever solution?
>
> Thanks.
>
> --
> v8-users mailing list
> v8-users@googlegroups.com
> http://groups.google.com/group/v8-users
>
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