The Snap! system is to make use of a lexx & yacc like capability so we can include fields that accept very complex expressions. For example, we want to support fields in HTML forms where you can enter sqrt(sin(20) * 3) and get the expected result.

At this point though, it is used for the domain names and website names. These are complex enough to justify the grammar. I'm to finish up the grammar of the domain and website implementations, but the grammar itself works. I have a test that checks that in detail enough to prove that it is now in place.

At this point, the domain grammar ...