Even the Antlr FAQ mentions that "almost no one uses parser generators to build commercial compilers."

* https://github.com/antlr/antlr4/blob/master/doc/faq/general....

* See: "What do you think are the problems people will try to solve with ANTLR4?" question

I've used several different parser generators in the past. But I've also transitioned to hand-rolled recursive decent parsers, being Lazy I've created a library to assist in hand-rolling a recursive decent parser: https://github.com/SAP/chevrotain