@taasan I can't speak for the maintainers of the official Rouge project but I think it would be better to avoid the class instance variables that you're using in the Abc lexer, if for no other reason that it's not consistent with the way the other code is written.

@taasan You've also got a large number of errors.

From a quick look, the errors are generally occurring because of the source input test. The text you're using could be used in many different languages and the ambiguity of that is causing the failure. You may just want to remove these tests. If you have a look at the spec for the lexers in the main repo, you'll see that a lot of them do not include this test.

This is being discussed in rouge-ruby#1092.