diff options
Diffstat (limited to 'js/src/builtin/Object.js')
| -rw-r--r-- | js/src/builtin/Object.js | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/js/src/builtin/Object.js b/js/src/builtin/Object.js new file mode 100644 index 0000000000..b25c7eb218 --- /dev/null +++ b/js/src/builtin/Object.js @@ -0,0 +1,325 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// ES stage 4 proposal +function ObjectGetOwnPropertyDescriptors(O) { + // Step 1. + var obj = ToObject(O); + + // Step 2. + var keys = std_Reflect_ownKeys(obj); + + // Step 3. + var descriptors = {}; + + // Step 4. + for (var index = 0, len = keys.length; index < len; index++) { + var key = keys[index]; + + // Steps 4.a-b. + var desc = ObjectGetOwnPropertyDescriptor(obj, key); + + // Step 4.c. + if (typeof desc !== "undefined") + _DefineDataProperty(descriptors, key, desc); + } + + // Step 5. + return descriptors; +} + +/* ES6 draft rev 32 (2015 Feb 2) 19.1.2.9. */ +function ObjectGetPrototypeOf(obj) { + return std_Reflect_getPrototypeOf(ToObject(obj)); +} + +/* ES6 draft rev 32 (2015 Feb 2) 19.1.2.11. */ +function ObjectIsExtensible(obj) { + return IsObject(obj) && std_Reflect_isExtensible(obj); +} + +/* ES2015 19.1.3.5 Object.prototype.toLocaleString */ +function Object_toLocaleString() { + // Step 1. + var O = this; + + // Step 2. + return callContentFunction(O.toString, O); +} + +// ES 2017 draft bb96899bb0d9ef9be08164a26efae2ee5f25e875 19.1.3.7 +function Object_valueOf() { + // Step 1. + return ToObject(this); +} + +// ES 2018 draft 19.1.3.2 +function Object_hasOwnProperty(V) { + // Implement hasOwnProperty as a pseudo function that becomes a JSOp + // to easier add an inline cache for this. + return hasOwn(V, this); +} + +// ES 2021 draft rev 0b988b7700de675331ac360d164c978d6ea452ec +// B.2.2.1.1 get Object.prototype.__proto__ +function $ObjectProtoGetter() { + return std_Reflect_getPrototypeOf(ToObject(this)); +} +_SetCanonicalName($ObjectProtoGetter, "get __proto__"); + +// ES 2021 draft rev 0b988b7700de675331ac360d164c978d6ea452ec +// B.2.2.1.2 set Object.prototype.__proto__ +function $ObjectProtoSetter(proto) { + return callFunction(std_Object_setProto, this, proto); +} +_SetCanonicalName($ObjectProtoSetter, "set __proto__"); + +// ES7 draft (2016 March 8) B.2.2.3 +function ObjectDefineSetter(name, setter) { + // Step 1. + var object = ToObject(this); + + // Step 2. + if (!IsCallable(setter)) + ThrowTypeError(JSMSG_BAD_GETTER_OR_SETTER, "setter"); + + // Step 4. + var key = TO_PROPERTY_KEY(name); + + // Steps 3, 5. + _DefineProperty(object, key, ACCESSOR_DESCRIPTOR_KIND | ATTR_ENUMERABLE | ATTR_CONFIGURABLE, + null, setter, true); + + // Step 6. (implicit) +} + +// ES7 draft (2016 March 8) B.2.2.2 +function ObjectDefineGetter(name, getter) { + // Step 1. + var object = ToObject(this); + + // Step 2. + if (!IsCallable(getter)) + ThrowTypeError(JSMSG_BAD_GETTER_OR_SETTER, "getter"); + + // Step 4. + var key = TO_PROPERTY_KEY(name); + + // Steps 3, 5. + _DefineProperty(object, key, ACCESSOR_DESCRIPTOR_KIND | ATTR_ENUMERABLE | ATTR_CONFIGURABLE, + getter, null, true); + + // Step 6. (implicit) +} + +// ES7 draft (2016 March 8) B.2.2.5 +function ObjectLookupSetter(name) { + // Step 1. + var object = ToObject(this); + + // Step 2. + var key = TO_PROPERTY_KEY(name); + + do { + // Step 3.a. + var desc = GetOwnPropertyDescriptorToArray(object, key); + + // Step 3.b. + if (desc) { + // Step.b.i. + if (desc[PROP_DESC_ATTRS_AND_KIND_INDEX] & ACCESSOR_DESCRIPTOR_KIND) + return desc[PROP_DESC_SETTER_INDEX]; + + // Step.b.i. + return undefined; + } + + // Step 3.c. + object = std_Reflect_getPrototypeOf(object); + } while (object !== null); + + // Step 3.d. (implicit) +} + +// ES7 draft (2016 March 8) B.2.2.4 +function ObjectLookupGetter(name) { + // Step 1. + var object = ToObject(this); + + // Step 2. + var key = TO_PROPERTY_KEY(name); + + do { + // Step 3.a. + var desc = GetOwnPropertyDescriptorToArray(object, key); + + // Step 3.b. + if (desc) { + // Step.b.i. + if (desc[PROP_DESC_ATTRS_AND_KIND_INDEX] & ACCESSOR_DESCRIPTOR_KIND) + return desc[PROP_DESC_GETTER_INDEX]; + + // Step.b.ii. + return undefined; + } + + // Step 3.c. + object = std_Reflect_getPrototypeOf(object); + } while (object !== null); + + // Step 3.d. (implicit) +} + +// ES2017 draft rev 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e +// 19.1.2.6 Object.getOwnPropertyDescriptor ( O, P ) +function ObjectGetOwnPropertyDescriptor(obj, propertyKey) { + // Steps 1-3. + var desc = GetOwnPropertyDescriptorToArray(obj, propertyKey); + + // Step 4 (Call to 6.2.4.4 FromPropertyDescriptor). + + // 6.2.4.4 FromPropertyDescriptor, step 1. + if (!desc) + return undefined; + + // 6.2.4.4 FromPropertyDescriptor, steps 2-5, 8-11. + var attrsAndKind = desc[PROP_DESC_ATTRS_AND_KIND_INDEX]; + if (attrsAndKind & DATA_DESCRIPTOR_KIND) { + return { + value: desc[PROP_DESC_VALUE_INDEX], + writable: !!(attrsAndKind & ATTR_WRITABLE), + enumerable: !!(attrsAndKind & ATTR_ENUMERABLE), + configurable: !!(attrsAndKind & ATTR_CONFIGURABLE), + }; + } + + // 6.2.4.4 FromPropertyDescriptor, steps 2-3, 6-11. + assert(attrsAndKind & ACCESSOR_DESCRIPTOR_KIND, "expected accessor property descriptor"); + return { + get: desc[PROP_DESC_GETTER_INDEX], + set: desc[PROP_DESC_SETTER_INDEX], + enumerable: !!(attrsAndKind & ATTR_ENUMERABLE), + configurable: !!(attrsAndKind & ATTR_CONFIGURABLE), + }; +} + +// ES2017 draft rev 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e +// 19.1.2.4 Object.defineProperty ( O, P, Attributes ) +// 26.1.3 Reflect.defineProperty ( target, propertyKey, attributes ) +function ObjectOrReflectDefineProperty(obj, propertyKey, attributes, strict) { + // Step 1. + if (!IsObject(obj)) + ThrowTypeError(JSMSG_OBJECT_REQUIRED, DecompileArg(0, obj)); + + // Step 2. + propertyKey = TO_PROPERTY_KEY(propertyKey); + + // Step 3 (Call to 6.2.4.5 ToPropertyDescriptor). + + // 6.2.4.5 ToPropertyDescriptor, step 1. + if (!IsObject(attributes)) + ThrowArgTypeNotObject(NOT_OBJECT_KIND_DESCRIPTOR, attributes); + + // 6.2.4.5 ToPropertyDescriptor, step 2. + var attrs = 0, hasValue = false; + var value, getter = null, setter = null; + + // 6.2.4.5 ToPropertyDescriptor, steps 3-4. + if ("enumerable" in attributes) + attrs |= attributes.enumerable ? ATTR_ENUMERABLE : ATTR_NONENUMERABLE; + + // 6.2.4.5 ToPropertyDescriptor, steps 5-6. + if ("configurable" in attributes) + attrs |= attributes.configurable ? ATTR_CONFIGURABLE : ATTR_NONCONFIGURABLE; + + // 6.2.4.5 ToPropertyDescriptor, steps 7-8. + if ("value" in attributes) { + attrs |= DATA_DESCRIPTOR_KIND; + value = attributes.value; + hasValue = true; + } + + // 6.2.4.5 ToPropertyDescriptor, steps 9-10. + if ("writable" in attributes) { + attrs |= DATA_DESCRIPTOR_KIND; + attrs |= attributes.writable ? ATTR_WRITABLE : ATTR_NONWRITABLE; + } + + // 6.2.4.5 ToPropertyDescriptor, steps 11-12. + if ("get" in attributes) { + attrs |= ACCESSOR_DESCRIPTOR_KIND; + getter = attributes.get; + if (!IsCallable(getter) && getter !== undefined) + ThrowTypeError(JSMSG_BAD_GET_SET_FIELD, "get"); + } + + // 6.2.4.5 ToPropertyDescriptor, steps 13-14. + if ("set" in attributes) { + attrs |= ACCESSOR_DESCRIPTOR_KIND; + setter = attributes.set; + if (!IsCallable(setter) && setter !== undefined) + ThrowTypeError(JSMSG_BAD_GET_SET_FIELD, "set"); + } + + if (attrs & ACCESSOR_DESCRIPTOR_KIND) { + // 6.2.4.5 ToPropertyDescriptor, step 15. + if (attrs & DATA_DESCRIPTOR_KIND) + ThrowTypeError(JSMSG_INVALID_DESCRIPTOR); + + // Step 4 (accessor descriptor property). + return _DefineProperty(obj, propertyKey, attrs, getter, setter, strict); + } + + // Step 4 (data property descriptor with value). + if (hasValue) { + // Use the inlinable _DefineDataProperty function when possible. + if (strict) { + if ((attrs & (ATTR_ENUMERABLE | ATTR_CONFIGURABLE | ATTR_WRITABLE)) === + (ATTR_ENUMERABLE | ATTR_CONFIGURABLE | ATTR_WRITABLE)) + { + _DefineDataProperty(obj, propertyKey, value); + return true; + } + } + + // The fifth argument is set to |null| to mark that |value| is present. + return _DefineProperty(obj, propertyKey, attrs, value, null, strict); + } + + // Step 4 (generic property descriptor or data property without value). + return _DefineProperty(obj, propertyKey, attrs, undefined, undefined, strict); +} + +// ES2017 draft rev 6859bb9ccaea9c6ede81d71e5320e3833b92cb3e +// 19.1.2.4 Object.defineProperty ( O, P, Attributes ) +function ObjectDefineProperty(obj, propertyKey, attributes) { + // Steps 1-4. + if (!ObjectOrReflectDefineProperty(obj, propertyKey, attributes, true)) { + // Not standardized yet: https://github.com/tc39/ecma262/pull/688 + return null; + } + + // Step 5. + return obj; +} + +// Proposal https://tc39.github.io/proposal-object-from-entries/ +// 1. Object.fromEntries ( iterable ) +function ObjectFromEntries(iter) { + // We omit the usual step number comments here because they don't help. + // This implementation inlines AddEntriesFromIterator and + // CreateDataPropertyOnObject, so it looks more like the polyfill + // <https://github.com/tc39/proposal-object-from-entries/blob/master/polyfill.js> + // than the spec algorithm. + const obj = {}; + + for (const pair of allowContentIter(iter)) { + if (!IsObject(pair)) + ThrowTypeError(JSMSG_INVALID_MAP_ITERABLE, "Object.fromEntries"); + _DefineDataProperty(obj, pair[0], pair[1]); + } + + return obj; +} + |