1 |
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2 | var Map = require('../modules/es.map');
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3 | var WeakMap = require('../modules/es.weak-map');
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4 | var create = require('../internals/object-create');
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5 | var isObject = require('../internals/is-object');
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6 |
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7 | var Node = function () {
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8 |
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9 | this.object = null;
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10 | this.symbol = null;
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11 |
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12 | this.primitives = null;
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13 | this.objectsByIndex = create(null);
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14 | };
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15 |
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16 | Node.prototype.get = function (key, initializer) {
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17 | return this[key] || (this[key] = initializer());
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18 | };
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19 |
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20 | Node.prototype.next = function (i, it, IS_OBJECT) {
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21 | var store = IS_OBJECT
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22 | ? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
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23 | : this.primitives || (this.primitives = new Map());
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24 | var entry = store.get(it);
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25 | if (!entry) store.set(it, entry = new Node());
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26 | return entry;
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27 | };
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28 |
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29 | var root = new Node();
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30 |
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31 | module.exports = function () {
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32 | var active = root;
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33 | var length = arguments.length;
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34 | var i, it;
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35 |
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36 | for (i = 0; i < length; i++) {
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37 | if (isObject(it = arguments[i])) active = active.next(i, it, true);
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38 | }
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39 | if (this === Object && active === root) throw TypeError('Composite keys must contain a non-primitive component');
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40 | for (i = 0; i < length; i++) {
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41 | if (!isObject(it = arguments[i])) active = active.next(i, it, false);
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42 | } return active;
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43 | };
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