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whitequark/parser

The Parser gem is the only existing tooling-grade Ruby parser. Parser powers Rubocop, the most popular Ruby code analyzer. Sorbet, a static type checker, also built their parser with C++ based on this gem.

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Parser is a production-ready Ruby parser written in pure Ruby. It recognizes as much or more code than Ripper, Melbourne, JRubyParser or ruby_parser, and is vastly more convenient to use.

You can also use unparser to produce equivalent source code from Parser’s ASTs.

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