ruby-citrus 3.0.2-1 (amd64 binary) in ubuntu disco

 Citrus is a compact and powerful parsing library for Ruby that combines the
 elegance and expressiveness of the language with the simplicity and power of
 parsing expressions.
 .
 A parsing expression grammar, or PEG, is a type of analytic formal grammar,
 i.e. it describes a formal language in terms of a set of rules for recognizing
 strings in the language.