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