1 | (function() {
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2 | 'use strict';
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3 | exports.version = '3.0.0';
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4 |
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5 | var isEqual = require('lodash.isequal');
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6 | var filterd = require('lodash.filter');
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7 | var clonedeep = require('lodash.clonedeep');
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8 | var matches = require('lodash.matches');
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9 |
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10 | function RuleEngine(rules, options) {
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11 | this.init();
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12 | if (typeof(rules) != "undefined") {
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13 | this.register(rules);
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14 | }
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15 | if (options) {
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16 | this.ignoreFactChanges = options.ignoreFactChanges;
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17 | }
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18 | return this;
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19 | }
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20 | RuleEngine.prototype.init = function(rules) {
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21 | this.rules = [];
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22 | this.activeRules = [];
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23 | };
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24 | RuleEngine.prototype.register = function(rules) {
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25 | if (Array.isArray(rules)) {
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26 | this.rules = this.rules.concat(rules);
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27 | } else if (rules !== null && typeof(rules) == "object") {
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28 | this.rules.push(rules);
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29 | }
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30 | this.sync();
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31 | };
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32 | RuleEngine.prototype.sync = function() {
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33 | this.activeRules = this.rules.filter(function(a) {
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34 | if (typeof(a.on) === "undefined") {
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35 | a.on = true;
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36 | }
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37 | if (a.on === true) {
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38 | return a;
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39 | }
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40 | });
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41 | this.activeRules.sort(function(a, b) {
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42 | if (a.priority && b.priority) {
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43 | return b.priority - a.priority;
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44 | } else {
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45 | return 0;
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46 | }
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47 | });
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48 | };
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49 | RuleEngine.prototype.execute = function(fact, callback) {
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50 |
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51 |
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52 | var thisHolder = this;
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53 | var complete = false;
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54 | fact.result = true;
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55 | var session = clonedeep(fact);
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56 | var lastSession = clonedeep(fact);
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57 | var _rules = this.activeRules;
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58 | var matchPath = [];
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59 | var ignoreFactChanges = this.ignoreFactChanges;
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60 | (function FnRuleLoop(x) {
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61 | var API = {
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62 | "rule": function() { return _rules[x]; },
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63 | "when": function(outcome) {
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64 | if (outcome) {
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65 | var _consequence = _rules[x].consequence;
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66 | _consequence.ruleRef = _rules[x].id || _rules[x].name || 'index_'+x;
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67 | process.nextTick(function() {
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68 | matchPath.push(_consequence.ruleRef);
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69 | _consequence.call(session, API, session);
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70 | });
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71 | } else {
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72 | process.nextTick(function() {
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73 | API.next();
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74 | });
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75 | }
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76 | },
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77 | "restart": function() {
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78 | return FnRuleLoop(0);
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79 | },
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80 | "stop": function() {
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81 | complete = true;
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82 | return FnRuleLoop(0);
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83 | },
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84 | "next": function() {
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85 | if (!ignoreFactChanges && !isEqual(lastSession, session)) {
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86 | lastSession = clonedeep(session);
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87 | process.nextTick(function() {
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88 | API.restart();
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89 | });
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90 | } else {
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91 | process.nextTick(function() {
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92 | return FnRuleLoop(x + 1);
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93 | });
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94 | }
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95 | }
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96 | };
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97 | _rules = thisHolder.activeRules;
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98 | if (x < _rules.length && complete === false) {
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99 | var _rule = _rules[x].condition;
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100 | _rule.call(session, API, session);
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101 | } else {
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102 | process.nextTick(function() {
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103 | session.matchPath = matchPath;
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104 | return callback(session);
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105 | });
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106 | }
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107 | })(0);
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108 | };
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109 | RuleEngine.prototype.findRules = function(filter) {
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110 | if (typeof(filter) === "undefined") {
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111 | return this.rules;
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112 | } else {
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113 | var find = matches(filter);
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114 | return filterd(this.rules, find);
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115 | }
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116 | }
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117 | RuleEngine.prototype.turn = function(state, filter) {
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118 | var state = (state === "on" || state === "ON") ? true : false;
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119 | var rules = this.findRules(filter);
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120 | for (var i = 0, j = rules.length; i < j; i++) {
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121 | rules[i].on = state;
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122 | }
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123 | this.sync();
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124 | }
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125 | RuleEngine.prototype.prioritize = function(priority, filter) {
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126 | priority = parseInt(priority, 10);
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127 | var rules = this.findRules(filter);
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128 | for (var i = 0, j = rules.length; i < j; i++) {
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129 | rules[i].priority = priority;
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130 | }
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131 | this.sync();
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132 | }
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133 | module.exports = RuleEngine;
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134 | }(module.exports));
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