Functional Parser Several applicative parsers / parser combinators, inspired by: https://academy.realm.io/posts/tryswift-yasuhiro-inami-parser-combinator/ https://talk.objc.io/episodes/S01E78-swift-strings-and-substrings https://www.youtube.com/watch?v=YSnQ8N760mI https://www.pointfree.co/collections/parsing https://hackage.haskell.org/package/parsec