'use strict'; // ECMAScript 6 symbols shim var global = require('./_global') , has = require('./_has') , DESCRIPTORS = require('./_descriptors') , $export = require('./_export') , redefine = require('./_redefine') , META = require('./_meta').KEY , $fails = require('./_fails') , shared = require('./_shared') , setToStringTag = require('./_set-to-string-tag') , uid = require('./_uid') , wks = require('./_wks') , wksExt = require('./_wks-ext') , wksDefine = require('./_wks-define') , keyOf = require('./_keyof') , enumKeys = require('./_enum-keys') , isArray = require('./_is-array') , anObject = require('./_an-object') , toIObject = require('./_to-iobject') , toPrimitive = require('./_to-primitive') , createDesc = require('./_property-desc') , _create = require('./_object-create') , gOPNExt = require('./_object-gopn-ext') , $GOPD = require('./_object-gopd') , $DP = require('./_object-dp') , $keys = require('./_object-keys') , gOPD = $GOPD.f , dP = $DP.f , gOPN = gOPNExt.f , $Symbol = global.Symbol , $JSON = global.JSON , _stringify = $JSON && $JSON.stringify , PROTOTYPE = 'prototype' , HIDDEN = wks('_hidden') , TO_PRIMITIVE = wks('toPrimitive') , isEnum = {}.propertyIsEnumerable , SymbolRegistry = shared('symbol-registry') , AllSymbols = shared('symbols') , OPSymbols = shared('op-symbols') , ObjectProto = Object[PROTOTYPE] , USE_NATIVE = typeof $Symbol == 'function' , QObject = global.QObject; // Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173 var setter = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild; // fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687 var setSymbolDesc = DESCRIPTORS && $fails(function(){ return _create(dP({}, 'a', { get: function(){ return dP(this, 'a', {value: 7}).a; } })).a != 7; }) ? function(it, key, D){ var protoDesc = gOPD(ObjectProto, key); if(protoDesc)delete ObjectProto[key]; dP(it, key, D); if(protoDesc && it !== ObjectProto)dP(ObjectProto, key, protoDesc); } : dP; var wrap = function(tag){ var sym = AllSymbols[tag] = _create($Symbol[PROTOTYPE]); sym._k = tag; return sym; }; var isSymbol = USE_NATIVE && typeof $Symbol.iterator == 'symbol' ? function(it){ return typeof it == 'symbol'; } : function(it){ return it instanceof $Symbol; }; var $defineProperty = function defineProperty(it, key, D){ if(it === ObjectProto)$defineProperty(OPSymbols, key, D); anObject(it); key = toPrimitive(key, true); anObject(D); if(has(AllSymbols, key)){ if(!D.enumerable){ if(!has(it, HIDDEN))dP(it, HIDDEN, createDesc(1, {})); it[HIDDEN][key] = true; } else { if(has(it, HIDDEN) && it[HIDDEN][key])it[HIDDEN][key] = false; D = _create(D, {enumerable: createDesc(0, false)}); } return setSymbolDesc(it, key, D); } return dP(it, key, D); }; var $defineProperties = function defineProperties(it, P){ anObject(it); var keys = enumKeys(P = toIObject(P)) , i = 0 , l = keys.length , key; while(l > i)$defineProperty(it, key = keys[i++], P[key]); return it; }; var $create = function create(it, P){ return P === undefined ? _create(it) : $defineProperties(_create(it), P); }; var $propertyIsEnumerable = function propertyIsEnumerable(key){ var E = isEnum.call(this, key = toPrimitive(key, true)); if(this === ObjectProto && has(AllSymbols, key) && !has(OPSymbols, key))return false; return E || !has(this, key) || !has(AllSymbols, key) || has(this, HIDDEN) && this[HIDDEN][key] ? E : true; }; var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(it, key){ it = toIObject(it); key = toPrimitive(key, true); if(it === ObjectProto && has(AllSymbols, key) && !has(OPSymbols, key))return; var D = gOPD(it, key); if(D && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key]))D.enumerable = true; return D; }; var $getOwnPropertyNames = function getOwnPropertyNames(it){ var names = gOPN(toIObject(it)) , result = [] , i = 0 , key; while(names.length > i){ if(!has(AllSymbols, key = names[i++]) && key != HIDDEN && key != META)result.push(key); } return result; }; var $getOwnPropertySymbols = function getOwnPropertySymbols(it){ var IS_OP = it === ObjectProto , names = gOPN(IS_OP ? OPSymbols : toIObject(it)) , result = [] , i = 0 , key; while(names.length > i){ if(has(AllSymbols, key = names[i++]) && (IS_OP ? has(ObjectProto, key) : true))result.push(AllSymbols[key]); } return result; }; // 19.4.1.1 Symbol([description]) if(!USE_NATIVE){ $Symbol = function Symbol(){ if(this instanceof $Symbol)throw TypeError('Symbol is not a constructor!'); var tag = uid(arguments.length > 0 ? arguments[0] : undefined); var $set = function(value){ if(this === ObjectProto)$set.call(OPSymbols, value); if(has(this, HIDDEN) && has(this[HIDDEN], tag))this[HIDDEN][tag] = false; setSymbolDesc(this, tag, createDesc(1, value)); }; if(DESCRIPTORS && setter)setSymbolDesc(ObjectProto, tag, {configurable: true, set: $set}); return wrap(tag); }; redefine($Symbol[PROTOTYPE], 'toString', function toString(){ return this._k; }); $GOPD.f = $getOwnPropertyDescriptor; $DP.f = $defineProperty; require('./_object-gopn').f = gOPNExt.f = $getOwnPropertyNames; require('./_object-pie').f = $propertyIsEnumerable; require('./_object-gops').f = $getOwnPropertySymbols; if(DESCRIPTORS && !require('./_library')){ redefine(ObjectProto, 'propertyIsEnumerable', $propertyIsEnumerable, true); } wksExt.f = function(name){ return wrap(wks(name)); } } $export($export.G + $export.W + $export.F * !USE_NATIVE, {Symbol: $Symbol}); for(var symbols = ( // 19.4.2.2, 19.4.2.3, 19.4.2.4, 19.4.2.6, 19.4.2.8, 19.4.2.9, 19.4.2.10, 19.4.2.11, 19.4.2.12, 19.4.2.13, 19.4.2.14 'hasInstance,isConcatSpreadable,iterator,match,replace,search,species,split,toPrimitive,toStringTag,unscopables' ).split(','), i = 0; symbols.length > i; )wks(symbols[i++]); for(var symbols = $keys(wks.store), i = 0; symbols.length > i; )wksDefine(symbols[i++]); $export($export.S + $export.F * !USE_NATIVE, 'Symbol', { // 19.4.2.1 Symbol.for(key) 'for': function(key){ return has(SymbolRegistry, key += '') ? SymbolRegistry[key] : SymbolRegistry[key] = $Symbol(key); }, // 19.4.2.5 Symbol.keyFor(sym) keyFor: function keyFor(key){ if(isSymbol(key))return keyOf(SymbolRegistry, key); throw TypeError(key + ' is not a symbol!'); }, useSetter: function(){ setter = true; }, useSimple: function(){ setter = false; } }); $export($export.S + $export.F * !USE_NATIVE, 'Object', { // 19.1.2.2 Object.create(O [, Properties]) create: $create, // 19.1.2.4 Object.defineProperty(O, P, Attributes) defineProperty: $defineProperty, // 19.1.2.3 Object.defineProperties(O, Properties) defineProperties: $defineProperties, // 19.1.2.6 Object.getOwnPropertyDescriptor(O, P) getOwnPropertyDescriptor: $getOwnPropertyDescriptor, // 19.1.2.7 Object.getOwnPropertyNames(O) getOwnPropertyNames: $getOwnPropertyNames, // 19.1.2.8 Object.getOwnPropertySymbols(O) getOwnPropertySymbols: $getOwnPropertySymbols }); // 24.3.2 JSON.stringify(value [, replacer [, space]]) $JSON && $export($export.S + $export.F * (!USE_NATIVE || $fails(function(){ var S = $Symbol(); // MS Edge converts symbol values to JSON as {} // WebKit converts symbol values to JSON as null // V8 throws on boxed symbols return _stringify([S]) != '[null]' || _stringify({a: S}) != '{}' || _stringify(Object(S)) != '{}'; })), 'JSON', { stringify: function stringify(it){ if(it === undefined || isSymbol(it))return; // IE8 returns string on undefined var args = [it] , i = 1 , replacer, $replacer; while(arguments.length > i)args.push(arguments[i++]); replacer = args[1]; if(typeof replacer == 'function')$replacer = replacer; if($replacer || !isArray(replacer))replacer = function(key, value){ if($replacer)value = $replacer.call(this, key, value); if(!isSymbol(value))return value; }; args[1] = replacer; return _stringify.apply($JSON, args); } }); // 19.4.3.4 Symbol.prototype[@@toPrimitive](hint) $Symbol[PROTOTYPE][TO_PRIMITIVE] || require('./_hide')($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf); // 19.4.3.5 Symbol.prototype[@@toStringTag] setToStringTag($Symbol, 'Symbol'); // 20.2.1.9 Math[@@toStringTag] setToStringTag(Math, 'Math', true); // 24.3.3 JSON[@@toStringTag] setToStringTag(global.JSON, 'JSON', true);