I used grammarkit (https://github.com/dundalek/GrammKit https://github.com/dundalek/GrammKit), which further uses railroad-diagrams (https://github.com/tabatkin

I used grammarkit (https://github.com/dundalek/GrammKit https://github.com/dundalek/GrammKit), which further uses railroad-diagrams (https://github.com/tabatkins/railroad-diagrams https://github.com/tabatkins/railroad-diagrams) library to generate the RR diagrams. I don't know if they are related to Gunther Rademacher's RR diagram generator.