[grammarians] Comparison to RubyFront grammar

[Charles Oliver Nutter]

We on the JRuby project have recently become interested in helping make 
progress on an antlr-based grammar. For our purposes, the current YACC 
grammar works well enough, but it's fragile and a poor choice for any 
application that wants more than a straight-through parse (JIT 
compilation, IDEs and editors, code analysis tools). I'm curious about a 
few things:

- What's the state of the RubyGrammar project? How much code can it 
parse today? (especially in light of the recent contributions)
- How does it compare to the RubyFront grammar? I'm no grammarian, but 
at a glance that one appeared to be more complete, and was able to parse 
the entire stdlib (though I have no idea about accuracy).
- Is this project still being actively worked? If I have grammarians 
interested in helping, should I point them at rubygrammar or rubyfront? 
(I know of a few such folks inside and outside of Sun standing by)

-- 
Charles Oliver Nutter, JRuby Core Developer
headius at headius.com -- charles.o.nutter at sun.com
Blogging at headius.blogspot.com