es.symbol.constructor.js 11 KB

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  1. 'use strict';
  2. var $ = require('../internals/export');
  3. var globalThis = require('../internals/global-this');
  4. var call = require('../internals/function-call');
  5. var uncurryThis = require('../internals/function-uncurry-this');
  6. var IS_PURE = require('../internals/is-pure');
  7. var DESCRIPTORS = require('../internals/descriptors');
  8. var NATIVE_SYMBOL = require('../internals/symbol-constructor-detection');
  9. var fails = require('../internals/fails');
  10. var hasOwn = require('../internals/has-own-property');
  11. var isPrototypeOf = require('../internals/object-is-prototype-of');
  12. var anObject = require('../internals/an-object');
  13. var toIndexedObject = require('../internals/to-indexed-object');
  14. var toPropertyKey = require('../internals/to-property-key');
  15. var $toString = require('../internals/to-string');
  16. var createPropertyDescriptor = require('../internals/create-property-descriptor');
  17. var nativeObjectCreate = require('../internals/object-create');
  18. var objectKeys = require('../internals/object-keys');
  19. var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
  20. var getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');
  21. var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');
  22. var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
  23. var definePropertyModule = require('../internals/object-define-property');
  24. var definePropertiesModule = require('../internals/object-define-properties');
  25. var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');
  26. var defineBuiltIn = require('../internals/define-built-in');
  27. var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
  28. var shared = require('../internals/shared');
  29. var sharedKey = require('../internals/shared-key');
  30. var hiddenKeys = require('../internals/hidden-keys');
  31. var uid = require('../internals/uid');
  32. var wellKnownSymbol = require('../internals/well-known-symbol');
  33. var wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');
  34. var defineWellKnownSymbol = require('../internals/well-known-symbol-define');
  35. var defineSymbolToPrimitive = require('../internals/symbol-define-to-primitive');
  36. var setToStringTag = require('../internals/set-to-string-tag');
  37. var InternalStateModule = require('../internals/internal-state');
  38. var $forEach = require('../internals/array-iteration').forEach;
  39. var HIDDEN = sharedKey('hidden');
  40. var SYMBOL = 'Symbol';
  41. var PROTOTYPE = 'prototype';
  42. var setInternalState = InternalStateModule.set;
  43. var getInternalState = InternalStateModule.getterFor(SYMBOL);
  44. var ObjectPrototype = Object[PROTOTYPE];
  45. var $Symbol = globalThis.Symbol;
  46. var SymbolPrototype = $Symbol && $Symbol[PROTOTYPE];
  47. var RangeError = globalThis.RangeError;
  48. var TypeError = globalThis.TypeError;
  49. var QObject = globalThis.QObject;
  50. var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
  51. var nativeDefineProperty = definePropertyModule.f;
  52. var nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;
  53. var nativePropertyIsEnumerable = propertyIsEnumerableModule.f;
  54. var push = uncurryThis([].push);
  55. var AllSymbols = shared('symbols');
  56. var ObjectPrototypeSymbols = shared('op-symbols');
  57. var WellKnownSymbolsStore = shared('wks');
  58. // Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
  59. var USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;
  60. // fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
  61. var fallbackDefineProperty = function (O, P, Attributes) {
  62. var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);
  63. if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];
  64. nativeDefineProperty(O, P, Attributes);
  65. if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {
  66. nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);
  67. } return O;
  68. };
  69. var setSymbolDescriptor = DESCRIPTORS && fails(function () {
  70. return nativeObjectCreate(nativeDefineProperty({}, 'a', {
  71. get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }
  72. })).a !== 7;
  73. }) ? fallbackDefineProperty : nativeDefineProperty;
  74. var wrap = function (tag, description) {
  75. var symbol = AllSymbols[tag] = nativeObjectCreate(SymbolPrototype);
  76. setInternalState(symbol, {
  77. type: SYMBOL,
  78. tag: tag,
  79. description: description
  80. });
  81. if (!DESCRIPTORS) symbol.description = description;
  82. return symbol;
  83. };
  84. var $defineProperty = function defineProperty(O, P, Attributes) {
  85. if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
  86. anObject(O);
  87. var key = toPropertyKey(P);
  88. anObject(Attributes);
  89. if (hasOwn(AllSymbols, key)) {
  90. // first definition - default non-enumerable; redefinition - preserve existing state
  91. if (!('enumerable' in Attributes) ? !hasOwn(O, key) || (hasOwn(O, HIDDEN) && O[HIDDEN][key]) : !Attributes.enumerable) {
  92. if (!hasOwn(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, nativeObjectCreate(null)));
  93. O[HIDDEN][key] = true;
  94. } else {
  95. if (hasOwn(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
  96. Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });
  97. } return setSymbolDescriptor(O, key, Attributes);
  98. } return nativeDefineProperty(O, key, Attributes);
  99. };
  100. var $defineProperties = function defineProperties(O, Properties) {
  101. anObject(O);
  102. var properties = toIndexedObject(Properties);
  103. var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
  104. $forEach(keys, function (key) {
  105. if (!DESCRIPTORS || call($propertyIsEnumerable, properties, key)) $defineProperty(O, key, properties[key]);
  106. });
  107. return O;
  108. };
  109. var $create = function create(O, Properties) {
  110. return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);
  111. };
  112. var $propertyIsEnumerable = function propertyIsEnumerable(V) {
  113. var P = toPropertyKey(V);
  114. var enumerable = call(nativePropertyIsEnumerable, this, P);
  115. if (this === ObjectPrototype && hasOwn(AllSymbols, P) && !hasOwn(ObjectPrototypeSymbols, P)) return false;
  116. return enumerable || !hasOwn(this, P) || !hasOwn(AllSymbols, P) || hasOwn(this, HIDDEN) && this[HIDDEN][P]
  117. ? enumerable : true;
  118. };
  119. var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
  120. var it = toIndexedObject(O);
  121. var key = toPropertyKey(P);
  122. if (it === ObjectPrototype && hasOwn(AllSymbols, key) && !hasOwn(ObjectPrototypeSymbols, key)) return;
  123. var descriptor = nativeGetOwnPropertyDescriptor(it, key);
  124. if (descriptor && hasOwn(AllSymbols, key) && !(hasOwn(it, HIDDEN) && it[HIDDEN][key])) {
  125. descriptor.enumerable = true;
  126. }
  127. return descriptor;
  128. };
  129. var $getOwnPropertyNames = function getOwnPropertyNames(O) {
  130. var names = nativeGetOwnPropertyNames(toIndexedObject(O));
  131. var result = [];
  132. $forEach(names, function (key) {
  133. if (!hasOwn(AllSymbols, key) && !hasOwn(hiddenKeys, key)) push(result, key);
  134. });
  135. return result;
  136. };
  137. var $getOwnPropertySymbols = function (O) {
  138. var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;
  139. var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
  140. var result = [];
  141. $forEach(names, function (key) {
  142. if (hasOwn(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || hasOwn(ObjectPrototype, key))) {
  143. push(result, AllSymbols[key]);
  144. }
  145. });
  146. return result;
  147. };
  148. // `Symbol` constructor
  149. // https://tc39.es/ecma262/#sec-symbol-constructor
  150. if (!NATIVE_SYMBOL) {
  151. $Symbol = function Symbol() {
  152. if (isPrototypeOf(SymbolPrototype, this)) throw new TypeError('Symbol is not a constructor');
  153. var description = !arguments.length || arguments[0] === undefined ? undefined : $toString(arguments[0]);
  154. var tag = uid(description);
  155. var setter = function (value) {
  156. var $this = this === undefined ? globalThis : this;
  157. if ($this === ObjectPrototype) call(setter, ObjectPrototypeSymbols, value);
  158. if (hasOwn($this, HIDDEN) && hasOwn($this[HIDDEN], tag)) $this[HIDDEN][tag] = false;
  159. var descriptor = createPropertyDescriptor(1, value);
  160. try {
  161. setSymbolDescriptor($this, tag, descriptor);
  162. } catch (error) {
  163. if (!(error instanceof RangeError)) throw error;
  164. fallbackDefineProperty($this, tag, descriptor);
  165. }
  166. };
  167. if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });
  168. return wrap(tag, description);
  169. };
  170. SymbolPrototype = $Symbol[PROTOTYPE];
  171. defineBuiltIn(SymbolPrototype, 'toString', function toString() {
  172. return getInternalState(this).tag;
  173. });
  174. defineBuiltIn($Symbol, 'withoutSetter', function (description) {
  175. return wrap(uid(description), description);
  176. });
  177. propertyIsEnumerableModule.f = $propertyIsEnumerable;
  178. definePropertyModule.f = $defineProperty;
  179. definePropertiesModule.f = $defineProperties;
  180. getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;
  181. getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;
  182. getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;
  183. wrappedWellKnownSymbolModule.f = function (name) {
  184. return wrap(wellKnownSymbol(name), name);
  185. };
  186. if (DESCRIPTORS) {
  187. // https://tc39.es/ecma262/#sec-symbol.prototype.description
  188. defineBuiltInAccessor(SymbolPrototype, 'description', {
  189. configurable: true,
  190. get: function description() {
  191. return getInternalState(this).description;
  192. }
  193. });
  194. if (!IS_PURE) {
  195. defineBuiltIn(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });
  196. }
  197. }
  198. }
  199. $({ global: true, constructor: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {
  200. Symbol: $Symbol
  201. });
  202. $forEach(objectKeys(WellKnownSymbolsStore), function (name) {
  203. defineWellKnownSymbol(name);
  204. });
  205. $({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {
  206. useSetter: function () { USE_SETTER = true; },
  207. useSimple: function () { USE_SETTER = false; }
  208. });
  209. $({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {
  210. // `Object.create` method
  211. // https://tc39.es/ecma262/#sec-object.create
  212. create: $create,
  213. // `Object.defineProperty` method
  214. // https://tc39.es/ecma262/#sec-object.defineproperty
  215. defineProperty: $defineProperty,
  216. // `Object.defineProperties` method
  217. // https://tc39.es/ecma262/#sec-object.defineproperties
  218. defineProperties: $defineProperties,
  219. // `Object.getOwnPropertyDescriptor` method
  220. // https://tc39.es/ecma262/#sec-object.getownpropertydescriptors
  221. getOwnPropertyDescriptor: $getOwnPropertyDescriptor
  222. });
  223. $({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {
  224. // `Object.getOwnPropertyNames` method
  225. // https://tc39.es/ecma262/#sec-object.getownpropertynames
  226. getOwnPropertyNames: $getOwnPropertyNames
  227. });
  228. // `Symbol.prototype[@@toPrimitive]` method
  229. // https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
  230. defineSymbolToPrimitive();
  231. // `Symbol.prototype[@@toStringTag]` property
  232. // https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag
  233. setToStringTag($Symbol, SYMBOL);
  234. hiddenKeys[HIDDEN] = true;