Kevin Newton

Posts

  • 2024-04-16 •

    Prism in 2024

    In Ruby 3.3.0, a new standard library was added to CRuby called Prism. Prism is a parser for the Ruby language, exposed as both a C library (optionally usable by CRuby) and a Ruby library (usable as a Ruby gem). The Prism project represents many person-years worth of effort, and is the result of a collaboration between Shopify, CRuby core contributors, other Ruby implementation authors, and Ruby tooling developers.

  • 2023-06-12 •

    Rewriting the Ruby parser

    At Shopify, we have spent the last year writing a new Ruby parser, which we’ve called YARP (Yet Another Ruby Parser). As of the date of this post, YARP can parse a semantically equivalent syntax tree to Ruby 3.3 on every Ruby file in Shopify’s main codebase, GitHub’s main codebase, CRuby, and the 100 most popular gems downloaded from rubygems.org. We recently got approval to merge this work into CRuby, and are very excited to share our work with the community. This post will take you through the motivations behind this work, the way it was developed, and the path forward.