locos

A library for using declarative configuration data, based on logic programming.

Usage

Add the following to your :dependencies:

[palletops/locos "0.1.3"]

Introduction

The library allows you to write rules as vector triples. Each rule consists of a pattern, a production and any number of guards.

(use 'palletops.locos)
(defrules simple
  [{:item :a} {:x 1}]
  [{:item :b} {:x 2}]
  [{:item :b :factor ?f} {:x (* 2 ?f)}]
  [{:item :b :factor ?f} {:x (* 3 ?f)} [> ?f 4]])

The rules can be passed to the config function to retrieve a map built from merging all matched rules.

(config {:item :a} simple) => {:x 1}
(config {:item :b} simple) => {:x 2}
(config {:item :b :factor 2} simple) => {:x 4}
(config {:item :b :factor 5} simple) => {:x 15}

License

Licensed under EPL

Copyright © 2012-2014 Hugo Duncan, Antoni Batchelli