44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
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// TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
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var Map = require('../modules/es.map');
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var WeakMap = require('../modules/es.weak-map');
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var create = require('../internals/object-create');
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var isObject = require('../internals/is-object');
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var Node = function () {
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// keys
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this.object = null;
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this.symbol = null;
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// child nodes
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this.primitives = null;
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this.objectsByIndex = create(null);
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};
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Node.prototype.get = function (key, initializer) {
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return this[key] || (this[key] = initializer());
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};
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Node.prototype.next = function (i, it, IS_OBJECT) {
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var store = IS_OBJECT
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? this.objectsByIndex[i] || (this.objectsByIndex[i] = new WeakMap())
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: this.primitives || (this.primitives = new Map());
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var entry = store.get(it);
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if (!entry) store.set(it, entry = new Node());
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return entry;
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};
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var root = new Node();
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module.exports = function () {
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var active = root;
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var length = arguments.length;
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var i, it;
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// for prevent leaking, start from objects
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for (i = 0; i < length; i++) {
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if (isObject(it = arguments[i])) active = active.next(i, it, true);
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}
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if (this === Object && active === root) throw TypeError('Composite keys must contain a non-primitive component');
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for (i = 0; i < length; i++) {
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if (!isObject(it = arguments[i])) active = active.next(i, it, false);
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} return active;
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};
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