rbison generates a Ruby parser class from a Bison-like specification
file.  rbison uses Bison to do all the hard work (generating state
transition tables, etc), then translates the Bison-generated C code
into Ruby code.

Author:	Jonathan Aseltine <aseltine@cs.umass.edu>
WWW:	http://www.cs.umass.edu/~aseltine/rbison.html