90 lines
2.8 KiB
JavaScript
Executable file
90 lines
2.8 KiB
JavaScript
Executable file
var $ = require('../internals/export');
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var uncurryThis = require('../internals/function-uncurry-this');
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var hiddenKeys = require('../internals/hidden-keys');
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var isObject = require('../internals/is-object');
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var hasOwn = require('../internals/has-own-property');
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var defineProperty = require('../internals/object-define-property').f;
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var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
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var getOwnPropertyNamesExternalModule = require('../internals/object-get-own-property-names-external');
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var isExtensible = require('../internals/object-is-extensible');
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var uid = require('../internals/uid');
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var FREEZING = require('../internals/freezing');
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var REQUIRED = false;
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var METADATA = uid('meta');
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var id = 0;
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var setMetadata = function (it) {
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defineProperty(it, METADATA, { value: {
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objectID: 'O' + id++, // object ID
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weakData: {} // weak collections IDs
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} });
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};
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var fastKey = function (it, create) {
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// return a primitive with prefix
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if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
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if (!hasOwn(it, METADATA)) {
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// can't set metadata to uncaught frozen object
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if (!isExtensible(it)) return 'F';
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// not necessary to add metadata
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if (!create) return 'E';
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// add missing metadata
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setMetadata(it);
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// return object ID
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} return it[METADATA].objectID;
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};
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var getWeakData = function (it, create) {
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if (!hasOwn(it, METADATA)) {
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// can't set metadata to uncaught frozen object
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if (!isExtensible(it)) return true;
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// not necessary to add metadata
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if (!create) return false;
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// add missing metadata
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setMetadata(it);
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// return the store of weak collections IDs
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} return it[METADATA].weakData;
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};
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// add metadata on freeze-family methods calling
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var onFreeze = function (it) {
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if (FREEZING && REQUIRED && isExtensible(it) && !hasOwn(it, METADATA)) setMetadata(it);
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return it;
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};
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var enable = function () {
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meta.enable = function () { /* empty */ };
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REQUIRED = true;
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var getOwnPropertyNames = getOwnPropertyNamesModule.f;
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var splice = uncurryThis([].splice);
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var test = {};
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test[METADATA] = 1;
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// prevent exposing of metadata key
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if (getOwnPropertyNames(test).length) {
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getOwnPropertyNamesModule.f = function (it) {
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var result = getOwnPropertyNames(it);
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for (var i = 0, length = result.length; i < length; i++) {
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if (result[i] === METADATA) {
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splice(result, i, 1);
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break;
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}
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} return result;
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};
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$({ target: 'Object', stat: true, forced: true }, {
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getOwnPropertyNames: getOwnPropertyNamesExternalModule.f
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});
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}
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};
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var meta = module.exports = {
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enable: enable,
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fastKey: fastKey,
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getWeakData: getWeakData,
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onFreeze: onFreeze
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};
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hiddenKeys[METADATA] = true;
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