[TxMt] Advice on a Langauge Grammar?

[Charles Turner]

Hi all-

I'm working on a language grammar for Forth, and am hoping I could get 
some advice or pointers for my work. I've read the TextMate manual, and 
James Gray's fine book, although I'm sure I haven't extracted every 
nugget of info from those texts.

As some of you may be aware, Forth is a stateful language, and there 
are certain keywords that are valid only when Forth is compiling. For 
example, some words, like IF, THEN and ELSE, can be used only within a 
word (function) definition.

So it would be nice to capture this in the scope, and assign these 
compile-only words to an "invalid" scope when they are used outside a 
function definition. The question is, how to (best) do this?

I've looked at the C language definition a bit, and clearly there are 
two modes there: "preprocessing", and "not". But with Forth, I should 
be able to assign an invalid scope to the top-level; in essence, have 
an invalid scope for source.forth.

Any thoughts?

Best, Charles