Cdd is a pure-Ruby library that models the IEC Common Data Dictionary (IEC 61360 / CDD ontology), supports power-type semantics where instances can themselves be used as classes, and imports the Parcel Excel workbook format (both ParcelMaker .xlsx and the legacy 6-file .xls export layout) into a navigable in-memory database.

packrat_parser is a small PEG/packrat parser-combinator library. Grammar rules are plain methods that return parsers and can be written using the `for ... then` comprehension (flat_map/map/filter), giving a Scala-style for-comprehension feel.

Peruby runs a practical subset of Perl 5 without native extensions.

A PGN parser and FEN generator for Ruby

A little language to create one page web sites.

Annotates Racc parser tables and reduction methods for rbs-inline and Steep without changing Racc.

RazyK is a LazyK implementetion by pure ruby.

Regextest generates sample string that matches with regular expression. Unlike similar tools, it recognizes anchors, charactor classes and other advanced notation of ruby regex. Target users are programmers or students for debugging/learning regular expression. You can use [sample application](http://goo.gl/5miiF4) without installation.

Nokogiri (鋸) is an HTML, XML, SAX, and Reader parser. Among Nokogiri's many features is the ability to search documents via XPath or CSS3 selectors. XML is like violence - if it doesn’t solve your problems, you are not using enough of it.

A JSON parser/generator that conforms (I believe) to RFC7159 "The JavaScript Object Notation (JSON) Data Interchange Format". That RFC is very different to its predecessor RFC4627, when it comes to parsing. This gem honors the updated syntax as possible. The generator guarantees that a parsed valid properly rounds-trip to identical valid JSON representation.

A JSON parser/generator that conforms (I believe) to RFC8259 "The JavaScript Object Notation (JSON) Data Interchange Format". This gem honors the syntax as possible. The generator guarantees that a parsed valid properly rounds-trip to identical valid JSON representation.

syntax by Ruby, performance by Go

This is a Ruby implementation for Rison that represents compact data in URIs. This module provides a parsing and dumping API like JSON module.

Converts sql to mruby, mruby/c, or Arduino source code.

Parse RSQL/FIQL string expression into AST nodes

A Ruby library for parsing TOON, a tabular, schema-based data format with indentation-based structure

Rubic is a very simple Scheme interpreter written in Ruby.

Pure Ruby YANG parser and tree structure data store implementation

Nokogiri (鋸) is an HTML, XML, SAX, and Reader parser. Among Nokogiri's many features is the ability to search documents via XPath or CSS3 selectors. XML is like violence - if it doesn’t solve your problems, you are not using enough of it.

ruby_parser-legacy includes the ruby 1.8 and 1.9 parsers from ruby_parser (now removed) and plugs them into the existing system.