Best Way to make STRICT?

im trying to make a PreCompiler, i just want it to catalogue all Globals ONLY and make the precompiler recognise if a variable wasn't declared?

Whats the best approuch? i'll admit, im stuck on THIS one but it would help me guys

thanks for anything, in advance

Neochrome.co.uk

http://en.wikipedia.org/wiki/Lexical_analysis

ok, got the first part getting all the Global Vars
i think im missing something :(