Are scala.util.automata, scala.util.regexp, and scala.util.grammar really needed?

Question

These package exist for a long time as far as I know. However, I have not ever seen their realistic usage. And it seems that these packages are immature and no longer maintained. If yes, why these packages exist now ?

Answer 1

The package automata is used by scala.xml.dtd, and regexp is used by automata. As for grammar, I couldn't find any use of it and, perhaps, it could be removed.