1 | var NATIVE_WEAK_MAP = require('../internals/native-weak-map');
|
2 | var global = require('../internals/global');
|
3 | var isObject = require('../internals/is-object');
|
4 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
|
5 | var objectHas = require('../internals/has');
|
6 | var sharedKey = require('../internals/shared-key');
|
7 | var hiddenKeys = require('../internals/hidden-keys');
|
8 |
|
9 | var WeakMap = global.WeakMap;
|
10 | var set, get, has;
|
11 |
|
12 | var enforce = function (it) {
|
13 | return has(it) ? get(it) : set(it, {});
|
14 | };
|
15 |
|
16 | var getterFor = function (TYPE) {
|
17 | return function (it) {
|
18 | var state;
|
19 | if (!isObject(it) || (state = get(it)).type !== TYPE) {
|
20 | throw TypeError('Incompatible receiver, ' + TYPE + ' required');
|
21 | } return state;
|
22 | };
|
23 | };
|
24 |
|
25 | if (NATIVE_WEAK_MAP) {
|
26 | var store = new WeakMap();
|
27 | var wmget = store.get;
|
28 | var wmhas = store.has;
|
29 | var wmset = store.set;
|
30 | set = function (it, metadata) {
|
31 | wmset.call(store, it, metadata);
|
32 | return metadata;
|
33 | };
|
34 | get = function (it) {
|
35 | return wmget.call(store, it) || {};
|
36 | };
|
37 | has = function (it) {
|
38 | return wmhas.call(store, it);
|
39 | };
|
40 | } else {
|
41 | var STATE = sharedKey('state');
|
42 | hiddenKeys[STATE] = true;
|
43 | set = function (it, metadata) {
|
44 | createNonEnumerableProperty(it, STATE, metadata);
|
45 | return metadata;
|
46 | };
|
47 | get = function (it) {
|
48 | return objectHas(it, STATE) ? it[STATE] : {};
|
49 | };
|
50 | has = function (it) {
|
51 | return objectHas(it, STATE);
|
52 | };
|
53 | }
|
54 |
|
55 | module.exports = {
|
56 | set: set,
|
57 | get: get,
|
58 | has: has,
|
59 | enforce: enforce,
|
60 | getterFor: getterFor
|
61 | };
|