I want to parse text representations of various models...not CSV or JSON. Guido music notation is an example of something I'd like to parse in Swift: https://guidoeditor.grame.fr/?src=https://raw.githubusercontent.com/grame-cncm/guidodoc/master/examples/mkdocs/examples/4voices.gmn

I've used parser combinators in Scala. What would you recommend to use in Swift?

I don't have specific knowledge on this, so I cannot pretend to be authoritative.

That said, here are some suggestions:

• Write your own tokenizer, perhaps based on this old blog post. Sometimes, the answer really is to do it yourself.
• Look around for a tokenizer library that is written in Swift, like Mustard. It might be fit for purpose, or made to be so with sufficient work.

That people have written libraries to do this work suggests to me that there isn't any built-in functionality for this in the language, nor an already-existing framework supplied by Apple.