68 lines
2.8 KiB
JavaScript
68 lines
2.8 KiB
JavaScript
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'use strict';
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var global = require('../internals/global');
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var redefineAll = require('../internals/redefine-all');
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var InternalMetadataModule = require('../internals/internal-metadata');
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var collection = require('../internals/collection');
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var collectionWeak = require('../internals/collection-weak');
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var isObject = require('../internals/is-object');
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var enforceIternalState = require('../internals/internal-state').enforce;
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var NATIVE_WEAK_MAP = require('../internals/native-weak-map');
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var IS_IE11 = !global.ActiveXObject && 'ActiveXObject' in global;
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var isExtensible = Object.isExtensible;
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var InternalWeakMap;
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var wrapper = function (get) {
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return function WeakMap() {
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return get(this, arguments.length ? arguments[0] : undefined);
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};
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};
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// `WeakMap` constructor
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// https://tc39.github.io/ecma262/#sec-weakmap-constructor
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var $WeakMap = module.exports = collection('WeakMap', wrapper, collectionWeak, true, true);
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// IE11 WeakMap frozen keys fix
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// We can't use feature detection because it crash some old IE builds
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// https://github.com/zloirock/core-js/issues/485
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if (NATIVE_WEAK_MAP && IS_IE11) {
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InternalWeakMap = collectionWeak.getConstructor(wrapper, 'WeakMap', true);
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InternalMetadataModule.REQUIRED = true;
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var WeakMapPrototype = $WeakMap.prototype;
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var nativeDelete = WeakMapPrototype['delete'];
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var nativeHas = WeakMapPrototype.has;
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var nativeGet = WeakMapPrototype.get;
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var nativeSet = WeakMapPrototype.set;
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redefineAll(WeakMapPrototype, {
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'delete': function (key) {
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if (isObject(key) && !isExtensible(key)) {
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var state = enforceIternalState(this);
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if (!state.frozen) state.frozen = new InternalWeakMap();
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return nativeDelete.call(this, key) || state.frozen['delete'](key);
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} return nativeDelete.call(this, key);
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},
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has: function has(key) {
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if (isObject(key) && !isExtensible(key)) {
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var state = enforceIternalState(this);
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if (!state.frozen) state.frozen = new InternalWeakMap();
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return nativeHas.call(this, key) || state.frozen.has(key);
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} return nativeHas.call(this, key);
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},
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get: function get(key) {
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if (isObject(key) && !isExtensible(key)) {
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var state = enforceIternalState(this);
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if (!state.frozen) state.frozen = new InternalWeakMap();
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return nativeHas.call(this, key) ? nativeGet.call(this, key) : state.frozen.get(key);
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} return nativeGet.call(this, key);
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},
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set: function set(key, value) {
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if (isObject(key) && !isExtensible(key)) {
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var state = enforceIternalState(this);
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if (!state.frozen) state.frozen = new InternalWeakMap();
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nativeHas.call(this, key) ? nativeSet.call(this, key, value) : state.frozen.set(key, value);
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} else nativeSet.call(this, key, value);
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return this;
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}
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});
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}
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