312 lines
13 KiB
JavaScript
312 lines
13 KiB
JavaScript
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'use strict';
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var $ = require('../internals/export');
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var global = require('../internals/global');
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var getBuiltIn = require('../internals/get-built-in');
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var IS_PURE = require('../internals/is-pure');
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var DESCRIPTORS = require('../internals/descriptors');
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var NATIVE_SYMBOL = require('../internals/native-symbol');
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var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
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var fails = require('../internals/fails');
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var has = require('../internals/has');
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var isArray = require('../internals/is-array');
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var isObject = require('../internals/is-object');
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var anObject = require('../internals/an-object');
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var toObject = require('../internals/to-object');
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var toIndexedObject = require('../internals/to-indexed-object');
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var toPrimitive = require('../internals/to-primitive');
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var createPropertyDescriptor = require('../internals/create-property-descriptor');
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var nativeObjectCreate = require('../internals/object-create');
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var objectKeys = require('../internals/object-keys');
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var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
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var getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');
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var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');
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var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
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var definePropertyModule = require('../internals/object-define-property');
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var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var redefine = require('../internals/redefine');
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var shared = require('../internals/shared');
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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 uid = require('../internals/uid');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');
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var defineWellKnownSymbol = require('../internals/define-well-known-symbol');
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var setToStringTag = require('../internals/set-to-string-tag');
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var InternalStateModule = require('../internals/internal-state');
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var $forEach = require('../internals/array-iteration').forEach;
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var HIDDEN = sharedKey('hidden');
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var SYMBOL = 'Symbol';
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var PROTOTYPE = 'prototype';
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var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(SYMBOL);
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var ObjectPrototype = Object[PROTOTYPE];
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var $Symbol = global.Symbol;
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var $stringify = getBuiltIn('JSON', 'stringify');
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var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
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var nativeDefineProperty = definePropertyModule.f;
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var nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;
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var nativePropertyIsEnumerable = propertyIsEnumerableModule.f;
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var AllSymbols = shared('symbols');
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var ObjectPrototypeSymbols = shared('op-symbols');
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var StringToSymbolRegistry = shared('string-to-symbol-registry');
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var SymbolToStringRegistry = shared('symbol-to-string-registry');
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var WellKnownSymbolsStore = shared('wks');
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var QObject = global.QObject;
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// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
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var USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;
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// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
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var setSymbolDescriptor = DESCRIPTORS && fails(function () {
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return nativeObjectCreate(nativeDefineProperty({}, 'a', {
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get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }
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})).a != 7;
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}) ? function (O, P, Attributes) {
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var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);
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if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];
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nativeDefineProperty(O, P, Attributes);
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if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {
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nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);
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}
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} : nativeDefineProperty;
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var wrap = function (tag, description) {
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var symbol = AllSymbols[tag] = nativeObjectCreate($Symbol[PROTOTYPE]);
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setInternalState(symbol, {
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type: SYMBOL,
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tag: tag,
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description: description
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});
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if (!DESCRIPTORS) symbol.description = description;
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return symbol;
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};
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var isSymbol = USE_SYMBOL_AS_UID ? function (it) {
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return typeof it == 'symbol';
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} : function (it) {
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return Object(it) instanceof $Symbol;
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};
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var $defineProperty = function defineProperty(O, P, Attributes) {
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if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
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anObject(O);
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var key = toPrimitive(P, true);
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anObject(Attributes);
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if (has(AllSymbols, key)) {
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if (!Attributes.enumerable) {
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if (!has(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, {}));
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O[HIDDEN][key] = true;
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} else {
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if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
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Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });
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} return setSymbolDescriptor(O, key, Attributes);
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} return nativeDefineProperty(O, key, Attributes);
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};
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var $defineProperties = function defineProperties(O, Properties) {
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anObject(O);
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var properties = toIndexedObject(Properties);
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var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
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$forEach(keys, function (key) {
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if (!DESCRIPTORS || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);
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});
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return O;
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};
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var $create = function create(O, Properties) {
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return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);
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};
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var $propertyIsEnumerable = function propertyIsEnumerable(V) {
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var P = toPrimitive(V, true);
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var enumerable = nativePropertyIsEnumerable.call(this, P);
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if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;
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return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;
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};
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var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
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var it = toIndexedObject(O);
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var key = toPrimitive(P, true);
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if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;
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var descriptor = nativeGetOwnPropertyDescriptor(it, key);
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if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {
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descriptor.enumerable = true;
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}
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return descriptor;
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};
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var $getOwnPropertyNames = function getOwnPropertyNames(O) {
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var names = nativeGetOwnPropertyNames(toIndexedObject(O));
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var result = [];
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$forEach(names, function (key) {
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if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);
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});
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return result;
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};
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var $getOwnPropertySymbols = function getOwnPropertySymbols(O) {
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var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;
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var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
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var result = [];
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$forEach(names, function (key) {
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if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {
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result.push(AllSymbols[key]);
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}
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});
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return result;
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};
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// `Symbol` constructor
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// https://tc39.github.io/ecma262/#sec-symbol-constructor
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if (!NATIVE_SYMBOL) {
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$Symbol = function Symbol() {
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if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');
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var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);
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var tag = uid(description);
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var setter = function (value) {
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if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);
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if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;
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setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));
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};
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if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });
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return wrap(tag, description);
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};
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redefine($Symbol[PROTOTYPE], 'toString', function toString() {
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return getInternalState(this).tag;
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});
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redefine($Symbol, 'withoutSetter', function (description) {
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return wrap(uid(description), description);
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});
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propertyIsEnumerableModule.f = $propertyIsEnumerable;
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definePropertyModule.f = $defineProperty;
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getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;
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getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;
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getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;
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wrappedWellKnownSymbolModule.f = function (name) {
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return wrap(wellKnownSymbol(name), name);
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};
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if (DESCRIPTORS) {
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// https://github.com/tc39/proposal-Symbol-description
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nativeDefineProperty($Symbol[PROTOTYPE], 'description', {
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configurable: true,
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get: function description() {
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return getInternalState(this).description;
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}
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});
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if (!IS_PURE) {
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redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });
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}
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}
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}
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$({ global: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {
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Symbol: $Symbol
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});
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$forEach(objectKeys(WellKnownSymbolsStore), function (name) {
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defineWellKnownSymbol(name);
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});
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$({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {
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// `Symbol.for` method
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// https://tc39.github.io/ecma262/#sec-symbol.for
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'for': function (key) {
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var string = String(key);
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if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
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var symbol = $Symbol(string);
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StringToSymbolRegistry[string] = symbol;
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SymbolToStringRegistry[symbol] = string;
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return symbol;
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},
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// `Symbol.keyFor` method
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// https://tc39.github.io/ecma262/#sec-symbol.keyfor
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keyFor: function keyFor(sym) {
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if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');
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if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
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},
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useSetter: function () { USE_SETTER = true; },
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useSimple: function () { USE_SETTER = false; }
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});
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$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {
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// `Object.create` method
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// https://tc39.github.io/ecma262/#sec-object.create
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create: $create,
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// `Object.defineProperty` method
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// https://tc39.github.io/ecma262/#sec-object.defineproperty
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defineProperty: $defineProperty,
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// `Object.defineProperties` method
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// https://tc39.github.io/ecma262/#sec-object.defineproperties
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defineProperties: $defineProperties,
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// `Object.getOwnPropertyDescriptor` method
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// https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptors
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getOwnPropertyDescriptor: $getOwnPropertyDescriptor
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});
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$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {
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// `Object.getOwnPropertyNames` method
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// https://tc39.github.io/ecma262/#sec-object.getownpropertynames
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getOwnPropertyNames: $getOwnPropertyNames,
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// `Object.getOwnPropertySymbols` method
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// https://tc39.github.io/ecma262/#sec-object.getownpropertysymbols
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getOwnPropertySymbols: $getOwnPropertySymbols
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});
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// Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives
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// https://bugs.chromium.org/p/v8/issues/detail?id=3443
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$({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {
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getOwnPropertySymbols: function getOwnPropertySymbols(it) {
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return getOwnPropertySymbolsModule.f(toObject(it));
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}
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});
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// `JSON.stringify` method behavior with symbols
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// https://tc39.github.io/ecma262/#sec-json.stringify
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if ($stringify) {
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var FORCED_JSON_STRINGIFY = !NATIVE_SYMBOL || fails(function () {
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var symbol = $Symbol();
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// MS Edge converts symbol values to JSON as {}
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return $stringify([symbol]) != '[null]'
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// WebKit converts symbol values to JSON as null
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|| $stringify({ a: symbol }) != '{}'
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// V8 throws on boxed symbols
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|| $stringify(Object(symbol)) != '{}';
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});
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$({ target: 'JSON', stat: true, forced: FORCED_JSON_STRINGIFY }, {
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// eslint-disable-next-line no-unused-vars
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stringify: function stringify(it, replacer, space) {
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var args = [it];
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var index = 1;
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var $replacer;
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while (arguments.length > index) args.push(arguments[index++]);
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$replacer = replacer;
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if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
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if (!isArray(replacer)) replacer = function (key, value) {
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if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
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if (!isSymbol(value)) return value;
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};
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args[1] = replacer;
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return $stringify.apply(null, args);
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}
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});
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}
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// `Symbol.prototype[@@toPrimitive]` method
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// https://tc39.github.io/ecma262/#sec-symbol.prototype-@@toprimitive
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if (!$Symbol[PROTOTYPE][TO_PRIMITIVE]) {
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createNonEnumerableProperty($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);
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}
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// `Symbol.prototype[@@toStringTag]` property
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// https://tc39.github.io/ecma262/#sec-symbol.prototype-@@tostringtag
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setToStringTag($Symbol, SYMBOL);
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hiddenKeys[HIDDEN] = true;
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