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This is my weak attempt to use Treetop to parse a grammar. The grammar looks a lot like an expression in an "if" statement. "(Name=Bob&(IsCool=Yes|Age<20)" Treetop keeps giving me issues with endless recursion, so I've simplified the grammar to deal directly with the problem: recursive parenthesis. Once I deal with that, the rest should be easy. Treetop Docs: http://treetop.rubyforge.org/