Real grammar [1], regularly used by me, at least. It may not be the best way of doing things today, it was written three or four Perl 6 compilers ago. But it

Real grammar [1], regularly used by me, at least. It may not be the best way of doing things today, it was written three or four Perl 6 compilers ago. But it works on the latest Rakudo release. [1] https://github.com/colomon/ABC/blob/master/lib/ABC/Grammar.pm https://github.com/colomon/ABC/blob/master/lib/ABC/Grammar.p... Edited to add: I think originally based it on https://web.archive.org/web/20120201072612/http://www.norbeck.nu/abc/bnf/abc20bnf.htm https://web.archive.org/web/20120201072612/http://www.norbec...