debian-mirror-gitlab/core-js/modules/es.symbol.js
2019-09-25 13:30:05 +05:30

299 lines
12 KiB
JavaScript

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