I've used yacc/lex and bison/flex but ANTLR4 is the bees knees. It is a considerable improvement on previous ANTLRs. Separating out grammars (ANTLR grammar file

I've used yacc/lex and bison/flex but ANTLR4 is the bees knees. It is a considerable improvement on previous ANTLRs. Separating out grammars (ANTLR grammar file) from actions (Java files) makes everything better.