I agree that Lojban is a "research language", but that is certainly a good thing! Seen in relation to its size/popularity, quite a large amount of research in linguistics and computer science sprouted from it. I myself have comitted a master's thesis to the language [1] (on p. 29 I attempt to summarize where it was picked up in academia)
And PEG too https://github.com/Ilmen-vodhr/ilmentufa/
So what is the actual class of the language? YACC means LALR(1) and PEG means LL(*), afaik. Can you write a LL(k) or even SLL(k) grammar?
Did You Know... Lojban's regular enough that there's a yacc grammar for it? http://www.lojban.org/publications/formal-grammars/grammar.3...