1 | 'use strict';
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.FINISHED = exports.RUNNING = exports.READY = undefined;
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7 |
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8 | var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
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9 |
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10 | var _fact = require('./fact');
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11 |
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12 | var _fact2 = _interopRequireDefault(_fact);
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13 |
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14 | var _rule = require('./rule');
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15 |
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16 | var _rule2 = _interopRequireDefault(_rule);
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17 |
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18 | var _operator = require('./operator');
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19 |
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20 | var _operator2 = _interopRequireDefault(_operator);
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21 |
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22 | var _almanac = require('./almanac');
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23 |
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24 | var _almanac2 = _interopRequireDefault(_almanac);
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25 |
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26 | var _events = require('events');
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27 |
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28 | var _engineFacts = require('./engine-facts');
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29 |
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30 | var _engineDefaultOperators = require('./engine-default-operators');
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31 |
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32 | var _engineDefaultOperators2 = _interopRequireDefault(_engineDefaultOperators);
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33 |
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34 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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35 |
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36 | function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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37 |
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38 | function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
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39 |
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40 | function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
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41 |
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42 | var debug = require('debug')('json-rules-engine');
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43 |
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44 | var READY = exports.READY = 'READY';
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45 | var RUNNING = exports.RUNNING = 'RUNNING';
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46 | var FINISHED = exports.FINISHED = 'FINISHED';
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47 |
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48 | var Engine = function (_EventEmitter) {
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49 | _inherits(Engine, _EventEmitter);
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50 |
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51 | |
52 |
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53 |
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54 |
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55 | function Engine() {
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56 | var rules = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
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57 | var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
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58 |
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59 | _classCallCheck(this, Engine);
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60 |
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61 | var _this = _possibleConstructorReturn(this, (Engine.__proto__ || Object.getPrototypeOf(Engine)).call(this));
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62 |
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63 | _this.rules = [];
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64 | _this.allowUndefinedFacts = options.allowUndefinedFacts || false;
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65 | _this.operators = new Map();
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66 | _this.facts = new Map();
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67 | _this.status = READY;
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68 | rules.map(function (r) {
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69 | return _this.addRule(r);
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70 | });
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71 | _engineDefaultOperators2.default.map(function (o) {
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72 | return _this.addOperator(o);
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73 | });
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74 | return _this;
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75 | }
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76 |
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77 | |
78 |
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79 |
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80 |
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81 |
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82 |
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83 |
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84 |
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85 |
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86 |
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87 |
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88 | _createClass(Engine, [{
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89 | key: 'addRule',
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90 | value: function addRule(properties) {
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91 | if (!properties) throw new Error('Engine: addRule() requires options');
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92 | if (!properties.hasOwnProperty('conditions')) throw new Error('Engine: addRule() argument requires "conditions" property');
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93 | if (!properties.hasOwnProperty('event')) throw new Error('Engine: addRule() argument requires "event" property');
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94 |
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95 | var rule = void 0;
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96 | if (properties instanceof _rule2.default) {
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97 | rule = properties;
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98 | } else {
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99 | rule = new _rule2.default(properties);
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100 | }
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101 | rule.setEngine(this);
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102 |
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103 | this.rules.push(rule);
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104 | this.prioritizedRules = null;
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105 | return this;
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106 | }
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107 |
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108 | |
109 |
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110 |
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111 |
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112 |
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113 | }, {
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114 | key: 'removeRule',
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115 | value: function removeRule(rule) {
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116 | if (rule instanceof _rule2.default === false) throw new Error('Engine: removeRule() rule must be a instance of Rule');
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117 |
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118 | var index = this.rules.indexOf(rule);
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119 | if (index === -1) return false;
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120 | return Boolean(this.rules.splice(index, 1).length);
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121 | }
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122 |
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123 | |
124 |
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125 |
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126 |
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127 |
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128 |
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129 | }, {
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130 | key: 'addOperator',
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131 | value: function addOperator(operatorOrName, cb) {
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132 | var operator = void 0;
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133 | if (operatorOrName instanceof _operator2.default) {
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134 | operator = operatorOrName;
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135 | } else {
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136 | operator = new _operator2.default(operatorOrName, cb);
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137 | }
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138 | debug('engine::addOperator name:' + operator.name);
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139 | this.operators.set(operator.name, operator);
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140 | }
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141 |
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142 | |
143 |
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144 |
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145 |
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146 |
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147 |
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148 | }, {
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149 | key: 'removeOperator',
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150 | value: function removeOperator(operatorOrName) {
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151 | var operatorName = void 0;
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152 | if (operatorOrName instanceof _operator2.default) {
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153 | operatorName = operatorOrName.name;
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154 | } else {
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155 | operatorName = operatorOrName;
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156 | }
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157 |
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158 | return this.operators.delete(operatorName);
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159 | }
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160 |
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161 | |
162 |
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163 |
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164 |
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165 |
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166 |
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167 |
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168 | }, {
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169 | key: 'addFact',
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170 | value: function addFact(id, valueOrMethod, options) {
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171 | var factId = id;
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172 | var fact = void 0;
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173 | if (id instanceof _fact2.default) {
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174 | factId = id.id;
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175 | fact = id;
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176 | } else {
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177 | fact = new _fact2.default(id, valueOrMethod, options);
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178 | }
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179 | debug('engine::addFact id:' + factId);
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180 | this.facts.set(factId, fact);
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181 | return this;
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182 | }
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183 |
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184 | |
185 |
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186 |
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187 |
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188 |
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189 | }, {
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190 | key: 'removeFact',
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191 | value: function removeFact(factOrId) {
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192 | var factId = void 0;
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193 | if (!(factOrId instanceof _fact2.default)) {
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194 | factId = factOrId;
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195 | } else {
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196 | factId = factOrId.id;
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197 | }
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198 |
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199 | return this.facts.delete(factId);
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200 | }
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201 |
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202 | |
203 |
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204 |
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205 |
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206 |
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207 |
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208 |
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209 | }, {
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210 | key: 'prioritizeRules',
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211 | value: function prioritizeRules() {
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212 | if (!this.prioritizedRules) {
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213 | var ruleSets = this.rules.reduce(function (sets, rule) {
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214 | var priority = rule.priority;
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215 | if (!sets[priority]) sets[priority] = [];
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216 | sets[priority].push(rule);
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217 | return sets;
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218 | }, {});
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219 | this.prioritizedRules = Object.keys(ruleSets).sort(function (a, b) {
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220 | return Number(a) > Number(b) ? -1 : 1;
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221 | }).map(function (priority) {
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222 | return ruleSets[priority];
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223 | });
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224 | }
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225 | return this.prioritizedRules;
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226 | }
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227 |
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228 | |
229 |
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230 |
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231 |
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232 |
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233 |
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234 |
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235 | }, {
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236 | key: 'stop',
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237 | value: function stop() {
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238 | this.status = FINISHED;
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239 | return this;
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240 | }
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241 |
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242 | |
243 |
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244 |
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245 |
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246 |
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247 |
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248 | }, {
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249 | key: 'getFact',
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250 | value: function getFact(factId) {
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251 | return this.facts.get(factId);
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252 | }
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253 |
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254 | |
255 |
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256 |
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257 |
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258 |
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259 |
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260 | }, {
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261 | key: 'evaluateRules',
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262 | value: function evaluateRules(ruleArray, almanac) {
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263 | var _this2 = this;
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264 |
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265 | return Promise.all(ruleArray.map(function (rule) {
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266 | if (_this2.status !== RUNNING) {
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267 | debug('engine::run status:' + _this2.status + '; skipping remaining rules');
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268 | return;
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269 | }
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270 | return rule.evaluate(almanac).then(function (ruleResult) {
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271 | debug('engine::run ruleResult:' + ruleResult.result);
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272 | if (ruleResult.result) {
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273 | _this2.emit('success', rule.event, almanac, ruleResult);
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274 | _this2.emit(rule.event.type, rule.event.params, almanac, ruleResult);
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275 | almanac.factValue('success-events', { event: rule.event });
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276 | } else {
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277 | _this2.emit('failure', rule.event, almanac, ruleResult);
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278 | }
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279 | });
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280 | }));
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281 | }
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282 |
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283 | |
284 |
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285 |
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286 |
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287 |
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288 |
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289 |
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290 | }, {
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291 | key: 'run',
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292 | value: function run() {
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293 | var _this3 = this;
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294 |
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295 | var runtimeFacts = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
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296 |
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297 | debug('engine::run started');
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298 | debug('engine::run runtimeFacts:', runtimeFacts);
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299 | runtimeFacts['success-events'] = new _fact2.default('success-events', (0, _engineFacts.SuccessEventFact)(), { cache: false });
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300 | this.status = RUNNING;
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301 | var almanac = new _almanac2.default(this.facts, runtimeFacts);
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302 | var orderedSets = this.prioritizeRules();
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303 | var cursor = Promise.resolve();
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304 |
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305 |
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306 | return new Promise(function (resolve, reject) {
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307 | orderedSets.map(function (set) {
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308 | cursor = cursor.then(function () {
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309 | return _this3.evaluateRules(set, almanac);
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310 | }).catch(reject);
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311 | return cursor;
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312 | });
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313 | cursor.then(function () {
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314 | _this3.status = FINISHED;
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315 | debug('engine::run completed');
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316 | resolve(almanac.factValue('success-events'));
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317 | }).catch(reject);
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318 | });
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319 | }
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320 | }]);
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321 |
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322 | return Engine;
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323 | }(_events.EventEmitter);
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324 |
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325 | exports.default = Engine; |
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