| var NATIVE_WEAK_MAP = require('../internals/native-weak-map'); |
| var global = require('../internals/global'); |
| var isObject = require('../internals/is-object'); |
| var createNonEnumerableProperty = require('../internals/create-non-enumerable-property'); |
| var objectHas = require('../internals/has'); |
| var sharedKey = require('../internals/shared-key'); |
| var hiddenKeys = require('../internals/hidden-keys'); |
| |
| var WeakMap = global.WeakMap; |
| var set, get, has; |
| |
| var enforce = function (it) { |
| return has(it) ? get(it) : set(it, {}); |
| }; |
| |
| var getterFor = function (TYPE) { |
| return function (it) { |
| var state; |
| if (!isObject(it) || (state = get(it)).type !== TYPE) { |
| throw TypeError('Incompatible receiver, ' + TYPE + ' required'); |
| } return state; |
| }; |
| }; |
| |
| if (NATIVE_WEAK_MAP) { |
| var store = new WeakMap(); |
| var wmget = store.get; |
| var wmhas = store.has; |
| var wmset = store.set; |
| set = function (it, metadata) { |
| wmset.call(store, it, metadata); |
| return metadata; |
| }; |
| get = function (it) { |
| return wmget.call(store, it) || {}; |
| }; |
| has = function (it) { |
| return wmhas.call(store, it); |
| }; |
| } else { |
| var STATE = sharedKey('state'); |
| hiddenKeys[STATE] = true; |
| set = function (it, metadata) { |
| createNonEnumerableProperty(it, STATE, metadata); |
| return metadata; |
| }; |
| get = function (it) { |
| return objectHas(it, STATE) ? it[STATE] : {}; |
| }; |
| has = function (it) { |
| return objectHas(it, STATE); |
| }; |
| } |
| |
| module.exports = { |
| set: set, |
| get: get, |
| has: has, |
| enforce: enforce, |
| getterFor: getterFor |
| }; |