Runtime evaluator - get all open namespaces?

I’m trying to make an evaluator to evaluate something like this: “SomeImportedClass.someStaticProperty”.
In AS2 one could do this by looking up recursively all definitions starting from _global and recursively down to the final definitions. This isn’t a very efficient way to do it, but, at least is some kind of workaround. However, I cannot find a way to evaluate the above expression in AS3. So, is there a way to know all open namespaces (imported packages) at runtime for a given scope?

EDIT: i.e. what I would need to do is to invoke the bytecode instruction __as3_findpropstrict. And feed it the name of the property. If I could do this with the class name only - that would be even better…