microKanren in Ruby

A port of microKanren, a minimalistic logic programming language, to Ruby.

Description

This is a port of microKanren to Ruby. It is an almost exact translation of the original implementation, which was written for Petite Chez Scheme.

Installation

Add this line to your application's Gemfile:

gem 'micro_kanren'

And then execute:

$ bundle

Or install it yourself as:

$ gem install micro_kanren

Usage

The following example demonstrates how MicroKanren can be used from the console:

> require 'micro_kanren'
> include MicroKanren::Core
> include MicroKanren::MiniKanrenWrappers

> res = call_fresh(-> (q) { eq(q, 5) }).call(empty_state)
> puts lprint(res)
(((([0] . 5)) . 1))

See the spec file for more examples. The spec file is almost an exact port of the microKanren tests written in Scheme.

Credits

The code in this gem is closely based on the following sources:

  • The microKanren paper by Jason Hemann and Daniel P. Friedman. I read this paper a couple of times, and will probably have to read it a few more before I have a better understanding about what this code is doing and how to write more effective logic programs.
  • This code is also in parts copied from Scott Vokes' port of microKanren to Lua. It was great to have the Lua code as a second example of the implementation in the paper, and it made my job especially easy since Lua is so similar to Ruby.

Dependencies

This project requires Ruby 2.0 or higher. You can see which Rubies work with this project in the Travis CI Build Status.

Contributing

  1. Fork it ( http://github.com/jsl/ruby_ukanren/fork )
  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 new Pull Request

Build Status

Build Status