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Versions: 40
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Stored size: 1.96 KB
Contents
'use strict';
var global = require('./_global');
var each = require('./_array-methods')(0);
var redefine = require('./_redefine');
var meta = require('./_meta');
var assign = require('./_object-assign');
var weak = require('./_collection-weak');
var isObject = require('./_is-object');
var validate = require('./_validate-collection');
var NATIVE_WEAK_MAP = require('./_validate-collection');
var IS_IE11 = !global.ActiveXObject && 'ActiveXObject' in global;
var WEAK_MAP = 'WeakMap';
var getWeak = meta.getWeak;
var isExtensible = Object.isExtensible;
var uncaughtFrozenStore = weak.ufstore;
var 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(validate(this, WEAK_MAP)).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(validate(this, WEAK_MAP), key, value);
}
};
// 23.3 WeakMap Objects
var $WeakMap = module.exports = require('./_collection')(WEAK_MAP, wrapper, methods, weak, true, true);
// IE11 WeakMap frozen keys fix
if (NATIVE_WEAK_MAP && IS_IE11) {
InternalMap = weak.getConstructor(wrapper, WEAK_MAP);
assign(InternalMap.prototype, methods);
meta.NEED = true;
each(['delete', 'has', 'get', 'set'], function (key) {
var proto = $WeakMap.prototype;
var 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);
});
});
}
Version data entries
40 entries across 17 versions & 4 rubygems