mana.js

Creator of decision trees.

Mana was written to break out the nested decision tree logic from verdict.js. It uses verdict.js as the rule evaluator. This allows "nodes" on the decision tree to contain "children", which implicitly inherit the rules of the parent node.

Installation

npm install mana.js

Usage

var mana = require('mana.js');
var context = {
  var: {
    one: 1
  }
};
var payload = {
  id: 'root',
  children: [
    {
      id: 'Level 1',
      ruleset: {
        composite: 'all',
        rules: [{
          path: 'var.one',
          comparator: 'eq',
          value: 1
        }]
      },
      children: [
        {
          id: 'Level 1.1',
          composite: 'all',
          ruleset: [{
            path: '',
            comparator: 'eq',
            value: ''
          }],
          value: 'I am 1.1'
        },
        {
          id: 'Level 1.2',
          composite: 'any',
          ruleset: [{
            path: '',
            comparator: 'eq',
            value: ''
          }],
          value: 'I am 1.2'
        }
      ]
    }
  ]
};
var tree = mana.parse(payload);
var node = mana.evaluate(context);
console.log(node && node.value);

License

MIT license, whatever