i haven't been able to get Filter::Simple to build on win32, so i can't test your code right now. that's a shame, because this looks like fun code to test.

i do suspect you'll have a little difficulty with functions like DATA or END. i don't think surrounding double-underbars are the best identifiers, they already mean something. of course, users naming functions like those i mentioned are probably up to no good, anyway.

~Particle *accelerates*