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edn-ruby is a Ruby library to read and write edn- format/edn (extensible data notation), a subset of Clojure used for transferring data between applications, much like JSON, YAML, or XML.
In here, you can find a parser for a lisp like language and much more.
A really small and elegant HTTP server written in Ruby. Think Webrick. Using parslet. (Postmodern)
An external DSL for Ruby that tries to make regular expressions readable and maintainable. (Hal Fulton)
A self-ml implementation using parslet. (Ricardo Mendes)
Thnad is a tiny programming language with so few features that it is not useful for anything at all — except showing how to write a compiler in half an hour.
A units of measure library for Ruby. Part of it’s magic comes from supporting the “Unified Code for Units of Measure”, which has a formal grammar, described here. The grammar is sufficiently complicated that it can’t be solved with regular expressions (mostly because the grammar is recursive), and was therefore better suited for a PEG. (Josh Lewis)
A variant of Chris Pound’s word generator written in Ruby, with some improvements. (Robert Kosek)
A semantic version parser. (meh)
A ruby gem for parsing Wordpress style shortcodes using parslet. (Jamie Dyer)
A simple Java parser that can parse the overall structure of a Java file.
A ruby virtual machine in 100% ruby, that tries to parse most of ruby syntax using parslet.