D run-time interpretation

[Jacob via Digitalmars-d]

There are many programs out there that use some sort of scripting 
capabilities.

I've been wanting to write an app that exposes a scripting like 
environment D, lua, or some other fast language to the user.

But there are two requirements:

1. The user has access to all objects created in app. e.g., if I 
create a class X in the app then the user can instantiate X in 
the script without having to recreate it. (the script then, is 
sort of an extension of the app)

I don't mind actually having to expose X to the script, but it 
should be easy.

2. It should be fast. When it is "recompiled" it shouldn't take 
more than a few seconds. It also shouldn't require a 
re-initialization of everything.

Can D do this easily?