cql-ruby is a ruby gem for parsing CQL, and serializing parse trees back 
to CQL, to xCQL, or to a solr query.

A new version has been released, 0.8.0, available from gem update/install.

The new version improves greatly on the #to_solr serialization as a solr 
query, providing support for translation from more CQL relations than 
previously, fixing a couple bugs, and making #to_solr raise appropriate 
exceptions if you try to convert CQL that is not supported for 
#to_solr.  See: 
http://cql-ruby.rubyforge.org/svn/trunk/lib/cql_ruby/cql_to_solr.rb

That's the only change from the previous version, improved #to_solr.

I wrote the improved #to_solr, Chick Markley wrote the original cql-ruby 
gem, which was a port of the Java CQL parsing code by Mike Taylor. Ain't 
open source grand?

Jonathan