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InfluxDB
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It’s disappointing there doesn’t seem to be an easily available blog post or announcement (maybe I just didn’t find it), but the design doc lists a few motivations: https://github.com/ruby/prism/blob/main/docs/design.md
It looks like there was also a podcast interview last year that touches on the origins of the project: https://topenddevs.com/podcasts/ruby-rogues/episodes/the-new...
Reading between the lines it looks to me like this is motivated by ripper (the old parser) not being a great fit for tooling around ruby like IDE LSP integrations and such. Ripper isn’t fault tolerant (if the script has a a syntax error you don’t get a partial tree, just an exception); being implemented in ruby enough itself that it kind of depends on ruby which isn’t always convenient for integration (IDEs like vscode make plugins in JS easy, prism comes with node bindings), and maybe being enough of a crufty old code base that maintaining it and fixing those design issues was deemed impracticable.
Also worth noting if it wasn’t clear I’m pretty sure this parser is not being used or intended to be used for a ruby runtime to actually execute scripts, and that’s not what ripper was for either. This is for tooling that operates on ruby files for other purposes: syntax highlighting, linting, stuff like that.