logic-extensions

A collection of extensions for the Clojure core.logic relational/logic programming library.

Currently only contains logic-extensions.multo, but I have a few more ideas ;).

Install

Add the following entry to your project.clj :dependencies vector to include logic-extensions in your project, from clojars:

    [werg/logic-extensions "0.0.1-SNAPSHOT"]

Install datomic according to these instructions.

multo

logic-extensions.multo is an extension of the core.logic defne mechanism to account for predicates/relations where the goalset can be dynamically extended at runtime. I.e. a relational equivalent of multimethods, hence the naming.

Usage

In the repl:

   (use 'clojure.core.logic)
   (use 'logic-extensions.multo)

   (defmulte mymulte [a b])

   (defclause mymulte [a [:bar]] (== a :foo))
   (run* [q] (fresh [r s] (mymulte r s) (== q [r s])))
   ;([:foo [:bar]])

   (defclause mymulte [:baz b] (== b 42))
   (run* [q] (fresh [r s] (mymulte r s) (== q [r s])))
   ;([:baz 42] [:foo [:bar]])
   ; order may differ (it's a set by design)

License

Copyright (C) 2012 Gabriel Pickard

Distributed under the Eclipse Public License, the same as Clojure.