There was a delay in my project, I didn't do much last week - there were
final exams in the university and I had to prepare well. Now, when I finally
finished this term, I can concentrate on the project and be productive.

There were updates on the code since my last blog post.
I added a simple implementation of grouped tokens handling. It can be used
for the cases when you need to treat a set of equal tokens, which go one after
another, as a one big separate token.