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Re:Rewriting the Ruby Parser by progitter on Tuesday June 13, 2023 @12:22PM (#36312531)
Well described. Also I found this on github.

https://github.com/whitequark/parser

Re:Rewriting the Ruby Parser by vidarh on Wednesday June 14, 2023 @06:50AM (#36323968)
That is one of the many parsers listed in the article.