forked from ziprandom/cltk

A crystal port of the Ruby Language Toolkit

cltk Build Status

This is a port of the Ruby Language Toolkit to the Crystal Programming Language.

CLTK (like RLTK) is: a collection of classes and methods designed to help programmers create languages in an easy to use and straightforward manner. This toolkit provides the following features:

In addition, CLTK includes several ready-made lexers and parsers. As well as a serialization mechanism that renders a finalized parser back into crystal syntax to compile it without having to be finalized again at startup (see exp_lang_repl for a usage example).

To see what works have a look at the specs or run them with:

$ crystal spec

The Implementation has been strongly altered but the API is compatible to RLTK. The LLVM Bindings has not been ported. Instead crystals own LLVM Bindings were used in examples/kazoo/chapter 8/


To use the toolkit in your project add this to your application's shard.yml:

    github: ziprandom/cltk


See the example languages (and their specs):

  • interpreted language EXP_LANG (examples/exp_lang)
  • kazoo (examples/kazoo/chapter 8) with LLVM IR generation
  • brainfuck (examples/brainfuck)
  • json_parser (examples/json_parser) example of a linter / xml converter


can be found in the docs directory


  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request


  • ziprandom - creator of the port, maintainer
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