>>9
I see that you are too intimidated by the nature of your problem to seek a solution.
If you were adequately prepared to think about this subject, your natural response would have been to browse through the various lisp implementations and look at their features. The ones that support what was described in
>>8 should appear useful to you. If you are not satisfied with any of the implementations, you could consider being more flexible about the language choice. And go for, say, Lua, which is exactly what you want. But there are also plenty of general purpose scripting languages that can be used this way.
I remember ecl being neat. It's been a long time since I've used it though.
http://ecls.sourceforge.net/