That was version 0.1 bootstrapped off SDF2. Since 2009 Rascal is based on a topdown general algorithm calked GLL. It's still Scannerless with declarative disambiguation, like SGLR. Currently it's evolving to data-dependent GLL to be able to model the offside rule, the C pre-processor and symbol table, and other "interesting" stuff we encounter in programming languages. See thesis by Afroozeh and Izmaylova.