I was part of a project that, among many other things, created our own scripting language. It was extremely basic, using \n to indicate the end of a statement and implemented only SET/JMP/JZ/JNZ/IF/ELSE/ENDIF/WHILE/FOR/RETURN. That was it.
Now, this wasn't OO. However, what concerns me is that you want to create an OO language and expect non-programmers to be able to handle it. That's got "Bad Plan"(tm) written all over it. Perl is the easiest "real" language to learn, except for VB. (Maybe that's why M$oft made VB their scripting language of choice?) Start small. If you're smart in your design, the language should be upgradeable without impacting anything else. (Maybe a Script::* set of modules?) Plus, demanding that your users actually understand the basics of procedural programming isn't unreasonable - it's almost expected, these days. If your users demand scripting capabilities, you can demand knowledge. (Unless, of course, you were planning on writing a GUI "editor" that allowed them to drag-and-drop statements from a list... if you're doing that, quit your job and write a game.)
As for bad code checking, use eval. Let the interpreter check bad code for you! Oh, you can do basic easy stuff, like balance parentheses and the like, but don't do any complicated syntax or nothing. Why kill yourself when Perl does it already??
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