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