eval in current C++ scope

[Francisco Tolmasky]

I'd like to replicate the effect of eval in a C++ function. In other words, I'd like to be able to eval and affect the current HandleScope. So if I do "var x = 10", I'd like the HandleScope to get a x added, not for the Context's global to receive the x. Is this possible?

I suppose a parallel question is, can I "push" a scope for Script->Run? Basically, I'd like successive Runs to modify the same scope, not the global, the same way successive evals.

Thanks,

Francisco

[Ben Noordhuis]

I think the closest you can get is
v8::ScriptCompiler::CompileFunctionInContext(). It lets you compile
code in function context with control over its arguments and captured
variables.

Another approach is to intercept all global property accesses with
v8::ObjectTemplate::SetHandler() but that can be very slow.

[tbl...@icloud.com]

A HandleScope does not store any key-value pairs.

It sounds like what you need is to create multiple Contexts. If that's not quite what you want, I'd suggest creating objects using Object::New and using them as the receiver in CompileFunctionInContext.

~Theodore

[Francisco Tolmasky]

CompileFunctionInContext seems interesting. Do var's get added to context_extension? Also, is it possible to make a generator function with the?

[Theodore Dubois]

Doesn’t look like it. As the documentation says, CompileFunctionInContext is equivalent to

with (obj) {
// code
}

You really just need to use multiple contexts. Anything that you want to be shared between contexts can be shared.

~Theodore

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