I know you can extract this with lots of work from the documentation, but did anyone actually write a real parser (ideally lex/yacc resp. flex/bison) for Natural? I know this CoCoLab thing, but I need it for a 4.x version and cannot rely on a closed-source external library here.
No, any other tool will NOT do, we have to create software that rewrites Natural programs, therefore, I need a real parser.
Thank your for any hints