Hi Everyone,
Today I released v0.0.1 of nools <https://github.com/doug-martin/nools>, a
rules engine for node. I currently working on more documentation but any
feedback would be greatly appreciated!
Here is an example of using nools to calculate fibonacci numbers.
"use strict";
var nools = require("../index");
var Fibonacci = function (sequence, value) {
this.sequence = sequence;
this.value = value || -1;
};
var Result = function (result) {
this.result = result || -1;
};
var flow = nools.flow("Fibonacci Flow", function (flow) {
flow.rule("Recurse", {priority:1}, [
["not", Fibonacci, "f", "f.sequence == 1"],
[Fibonacci, "f1", "f1.sequence != 1"]
], function (facts) {
var f2 = new Fibonacci(facts.f1.sequence - 1);
this.assert(f2);
});
flow.rule("Bootstrap", [
Fibonacci, "f", "f.value == -1 && (f.sequence == 1 || f.sequence ==
2)"
], function (facts) {
var f = facts.f;
f.value = 1;
this.modify(f);
});
flow.rule("Calculate", [
[Fibonacci, "f1", "f1.value != -1", {sequence:"s1"}],
[Fibonacci, "f2", "f2.value != -1 && f2.sequence == s1 + 1",
{sequence:"s2"}],
[Fibonacci, "f3", "f3.value == -1 && f3.sequence == s2 + 1"],
[Result, "r"]
], function (facts) {
var f3 = facts.f3, f1 = facts.f1, f2 = facts.f2;
var v = f3.value = f1.value + facts.f2.value;
facts.r.result = v;
this.modify(f3);
this.retract(f1);
});
});
var r1 = new Result(),
session1 = flow.getSession(new Fibonacci(10), r1),
s1 = new Date;
session1.match().then(function () {
console.log("%d [%dms]", r1.result, new Date - s1);
session1.dispose();
});
var r2 = new Result(),
session2 = flow.getSession(new Fibonacci(150), r2),
s2 = new Date;
session2.match().then(function () {
console.log("%d [%dms]", r2.result, new Date - s2);
session2.dispose();
});
var r3 = new Result(),
session3 = flow.getSession(new Fibonacci(1000), r3),
s3 = new Date;
session3.match().then(function () {
console.log("%d [%dms]", r3.result, new Date - s3);
session3.dispose();
});
And of course its on npm
npm install nools
-Doug
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