56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
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'use strict';
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var each = require('./_array-methods')(0)
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, redefine = require('./_redefine')
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, meta = require('./_meta')
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, assign = require('./_object-assign')
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, weak = require('./_collection-weak')
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, isObject = require('./_is-object')
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, getWeak = meta.getWeak
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, isExtensible = Object.isExtensible
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, uncaughtFrozenStore = weak.ufstore
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, tmp = {}
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, InternalMap;
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var wrapper = function(get){
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return function WeakMap(){
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return get(this, arguments.length > 0 ? arguments[0] : undefined);
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};
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};
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var methods = {
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// 23.3.3.3 WeakMap.prototype.get(key)
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get: function get(key){
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if(isObject(key)){
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var data = getWeak(key);
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if(data === true)return uncaughtFrozenStore(this).get(key);
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return data ? data[this._i] : undefined;
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}
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},
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// 23.3.3.5 WeakMap.prototype.set(key, value)
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set: function set(key, value){
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return weak.def(this, key, value);
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}
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};
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// 23.3 WeakMap Objects
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var $WeakMap = module.exports = require('./_collection')('WeakMap', wrapper, methods, weak, true, true);
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// IE11 WeakMap frozen keys fix
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if(new $WeakMap().set((Object.freeze || Object)(tmp), 7).get(tmp) != 7){
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InternalMap = weak.getConstructor(wrapper);
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assign(InternalMap.prototype, methods);
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meta.NEED = true;
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each(['delete', 'has', 'get', 'set'], function(key){
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var proto = $WeakMap.prototype
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, method = proto[key];
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redefine(proto, key, function(a, b){
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// store frozen objects on internal weakmap shim
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if(isObject(a) && !isExtensible(a)){
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if(!this._f)this._f = new InternalMap;
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var result = this._f[key](a, b);
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return key == 'set' ? this : result;
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// store all the rest on native weakmap
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} return method.call(this, a, b);
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});
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});
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}
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