Source/JavaScriptCore/runtime/TemporalCalendarPrototype.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2021 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "TemporalCalendarPrototype.h"

 #include "BuiltinNames.h"
 #include "IteratorOperations.h"
 #include "JSCInlines.h"
 #include "ObjectConstructor.h"
 #include "TemporalCalendar.h"

 namespace JSC {

 static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncFields);
 static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncMergeFields);
 static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncToString);
 static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncToJSON);
 static JSC_DECLARE_CUSTOM_GETTER(temporalCalendarPrototypeGetterId);

 }

 #include "TemporalCalendarPrototype.lut.h"

 namespace JSC {

 const ClassInfo TemporalCalendarPrototype::s_info = { "Temporal.Calendar", &Base::s_info, &temporalCalendarPrototypeTable, nullptr, CREATE_METHOD_TABLE(TemporalCalendarPrototype) };

 /* Source for TemporalCalendarPrototype.lut.h
 @begin temporalCalendarPrototypeTable
     fields          temporalCalendarPrototypeFuncFields       DontEnum|Function 1
     mergeFields     temporalCalendarPrototypeFuncMergeFields  DontEnum|Function 2
     toString        temporalCalendarPrototypeFuncToString     DontEnum|Function 0
     toJSON          temporalCalendarPrototypeFuncToJSON       DontEnum|Function 0
     id              temporalCalendarPrototypeGetterId         ReadOnly|DontEnum|CustomAccessor
 @end
 */

 TemporalCalendarPrototype* TemporalCalendarPrototype::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
 {
     TemporalCalendarPrototype* object = new (NotNull, allocateCell<TemporalCalendarPrototype>(vm.heap)) TemporalCalendarPrototype(vm, structure);
     object->finishCreation(vm, globalObject);
     return object;
 }

 Structure* TemporalCalendarPrototype::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
 {
     return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
 }

 TemporalCalendarPrototype::TemporalCalendarPrototype(VM& vm, Structure* structure)
     : Base(vm, structure)
 {
 }

 void TemporalCalendarPrototype::finishCreation(VM& vm, JSGlobalObject*)
 {
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
     JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
 }

 // https://tc39.es/proposal-temporal/#sec-get-temporal.calendar.prototype.id
 JSC_DEFINE_CUSTOM_GETTER(temporalCalendarPrototypeGetterId, (JSGlobalObject* globalObject, EncodedJSValue thisValue, PropertyName))
 {
     return JSValue::encode(JSValue::decode(thisValue).toString(globalObject));
 }

 // https://tc39.es/proposal-temporal/#sup-temporal.calendar.prototype.fields
 JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncFields, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* calendar = jsDynamicCast<TemporalCalendar*>(vm, callFrame->thisValue());
     if (!calendar)
         return throwVMTypeError(globalObject, scope, "Temporal.Calendar.prototype.fields called on value that's not a Calendar"_s);

     bool isISO8601 = calendar->isISO8601();
     bool shouldAddEraAndEraYear = false;
     MarkedArgumentBuffer fieldNames;
     forEachInIterable(globalObject, callFrame->argument(0), [isISO8601, &shouldAddEraAndEraYear, &fieldNames](VM& vm, JSGlobalObject* globalObject, JSValue value) {
         auto scope = DECLARE_THROW_SCOPE(vm);
         if (!value.isString()) {
             throwTypeError(globalObject, scope, "fields include non string value"_s);
             return;
         }
         if (!isISO8601 && !shouldAddEraAndEraYear) {
             auto string = jsCast<JSString*>(value)->value(globalObject);
             RETURN_IF_EXCEPTION(scope, void());
             if (string == "year"_s)
                 shouldAddEraAndEraYear = true;
         }
         fieldNames.append(value);
     });
     RETURN_IF_EXCEPTION(scope, { });

     if (shouldAddEraAndEraYear) {
         fieldNames.append(jsNontrivialString(vm, vm.propertyNames->era.impl()));
         fieldNames.append(jsNontrivialString(vm, vm.propertyNames->eraYear.impl()));
     }

     RELEASE_AND_RETURN(scope, JSValue::encode(constructArray(globalObject, static_cast<ArrayAllocationProfile*>(nullptr), fieldNames)));
 }

 // https://tc39.es/proposal-temporal/#sec-temporal-defaultmergefields
 static JSObject* defaultMergeFields(JSGlobalObject* globalObject, JSObject* fields, JSObject* additionalFields)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* merged = constructEmptyObject(globalObject);

     {
         PropertyNameArray originalKeys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
         fields->methodTable(vm)->getOwnPropertyNames(fields, globalObject, originalKeys, DontEnumPropertiesMode::Include);
         RETURN_IF_EXCEPTION(scope, { });

         for (const auto& nextKey : originalKeys) {
             if (nextKey != vm.propertyNames->month && nextKey != vm.propertyNames->monthCode) {
                 JSValue propValue = fields->get(globalObject, nextKey);
                 RETURN_IF_EXCEPTION(scope, { });
                 if (!propValue.isUndefined()) {
                     PutPropertySlot slot(merged, true);
                     merged->putOwnDataProperty(vm, nextKey, propValue, slot);
                     RETURN_IF_EXCEPTION(scope, { });
                 }
             }
         }
     }

     bool includesMonthOrMonthCode = false;
     {
         PropertyNameArray newKeys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
         additionalFields->methodTable(vm)->getOwnPropertyNames(additionalFields, globalObject, newKeys, DontEnumPropertiesMode::Include);
         RETURN_IF_EXCEPTION(scope, { });

         for (const auto& nextKey : newKeys) {
             if (!includesMonthOrMonthCode) {
                 if (nextKey == vm.propertyNames->month || nextKey == vm.propertyNames->monthCode)
                     includesMonthOrMonthCode = true;
             }

             JSValue propValue = additionalFields->get(globalObject, nextKey);
             RETURN_IF_EXCEPTION(scope, { });
             if (!propValue.isUndefined()) {
                 PutPropertySlot slot(merged, true);
                 merged->putOwnDataProperty(vm, nextKey, propValue, slot);
                 RETURN_IF_EXCEPTION(scope, { });
             }
         }
     }

     if (!includesMonthOrMonthCode) {
         JSValue month = fields->get(globalObject, vm.propertyNames->month);
         RETURN_IF_EXCEPTION(scope, { });
         if (!month.isUndefined()) {
             PutPropertySlot slot(merged, true);
             merged->putOwnDataProperty(vm, vm.propertyNames->month, month, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }

         JSValue monthCode = fields->get(globalObject, vm.propertyNames->monthCode);
         RETURN_IF_EXCEPTION(scope, { });
         if (!monthCode.isUndefined()) {
             PutPropertySlot slot(merged, true);
             merged->putOwnDataProperty(vm, vm.propertyNames->monthCode, monthCode, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }
     }

     return merged;
 }

 // https://tc39.es/proposal-temporal/#sup-temporal.calendar.prototype.mergefields
 JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncMergeFields, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* calendar = jsDynamicCast<TemporalCalendar*>(vm, callFrame->thisValue());
     if (!calendar)
         return throwVMTypeError(globalObject, scope, "Temporal.Calendar.prototype.mergeFields called on value that's not a Calendar"_s);

     auto* fields = callFrame->argument(0).toObject(globalObject);
     RETURN_IF_EXCEPTION(scope, { });

     auto* additionalFields = callFrame->argument(1).toObject(globalObject);
     RETURN_IF_EXCEPTION(scope, { });

     if (calendar->isISO8601())
         RELEASE_AND_RETURN(scope, JSValue::encode(defaultMergeFields(globalObject, fields, additionalFields)));

     auto copyObject = [](JSGlobalObject* globalObject, JSObject* object) -> JSObject* {
         VM& vm = globalObject->vm();
         auto scope = DECLARE_THROW_SCOPE(vm);

         auto* copied = constructEmptyObject(globalObject);

         PropertyNameArray keys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
         object->methodTable(vm)->getOwnPropertyNames(object, globalObject, keys, DontEnumPropertiesMode::Include);
         RETURN_IF_EXCEPTION(scope, { });

         for (const auto& key : keys) {
             JSValue propValue = object->get(globalObject, key);
             RETURN_IF_EXCEPTION(scope, { });
             if (!propValue.isUndefined()) {
                 PutPropertySlot slot(copied, true);
                 copied->putOwnDataProperty(vm, key, propValue, slot);
                 RETURN_IF_EXCEPTION(scope, { });
             }
         }

         return copied;
     };

     auto* fieldsCopied = copyObject(globalObject, fields);
     RETURN_IF_EXCEPTION(scope, { });

     auto* additionalFieldsCopied = copyObject(globalObject, additionalFields);
     RETURN_IF_EXCEPTION(scope, { });

     JSValue newMonth = jsUndefined();
     JSValue newMonthCode = jsUndefined();
     JSValue newYear = jsUndefined();
     JSValue newEra = jsUndefined();
     JSValue newEraYear = jsUndefined();
     {
         PropertyNameArray keys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
         additionalFieldsCopied->methodTable(vm)->getOwnPropertyNames(additionalFieldsCopied, globalObject, keys, DontEnumPropertiesMode::Include);
         RETURN_IF_EXCEPTION(scope, { });

         for (const auto& key : keys) {
             JSValue propValue = additionalFieldsCopied->get(globalObject, key);
             RETURN_IF_EXCEPTION(scope, { });
             if (!propValue.isUndefined()) {
                 if (key == vm.propertyNames->month)
                     newMonth = propValue;
                 else if (key == vm.propertyNames->monthCode)
                     newMonthCode = propValue;
                 else if (key == vm.propertyNames->year)
                     newYear = propValue;
                 else if (key == vm.propertyNames->era)
                     newEra = propValue;
                 else if (key == vm.propertyNames->eraYear)
                     newEraYear = propValue;
                 else {
                     PutPropertySlot slot(fieldsCopied, true);
                     fieldsCopied->putOwnDataProperty(vm, key, propValue, slot);
                     RETURN_IF_EXCEPTION(scope, { });
                 }
             }
         }
     }

     if (!newMonth.isUndefined() || !newMonthCode.isUndefined()) {
         {
             PutPropertySlot slot(fieldsCopied, true);
             fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->month, newMonth, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }
         {
             PutPropertySlot slot(fieldsCopied, true);
             fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->monthCode, newMonthCode, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }
     }

     if (!newYear.isUndefined() || !newEra.isUndefined() || !newEraYear.isUndefined()) {
         {
             PutPropertySlot slot(fieldsCopied, true);
             fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->year, newYear, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }
         {
             PutPropertySlot slot(fieldsCopied, true);
             fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->era, newEra, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }
         {
             PutPropertySlot slot(fieldsCopied, true);
             fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->eraYear, newEraYear, slot);
             RETURN_IF_EXCEPTION(scope, { });
         }
     }

     return JSValue::encode(fieldsCopied);
 }

 // https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.tostring
 JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncToString, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* calendar = jsDynamicCast<TemporalCalendar*>(vm, callFrame->thisValue());
     if (!calendar)
         return throwVMTypeError(globalObject, scope, "Temporal.Calendar.prototype.toString called on value that's not a Calendar"_s);

     return JSValue::encode(jsString(vm, intlAvailableCalendars()[calendar->identifier()]));
 }

 // https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.tojson
 JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncToJSON, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     return JSValue::encode(callFrame->thisValue().toString(globalObject));
 }

 } // namespace JSC
	/*
	* Copyright (C) 2021 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "TemporalCalendarPrototype.h"

	#include "BuiltinNames.h"
	#include "IteratorOperations.h"
	#include "JSCInlines.h"
	#include "ObjectConstructor.h"
	#include "TemporalCalendar.h"

	namespace JSC {

	static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncFields);
	static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncMergeFields);
	static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncToString);
	static JSC_DECLARE_HOST_FUNCTION(temporalCalendarPrototypeFuncToJSON);
	static JSC_DECLARE_CUSTOM_GETTER(temporalCalendarPrototypeGetterId);

	}

	#include "TemporalCalendarPrototype.lut.h"

	namespace JSC {

	const ClassInfo TemporalCalendarPrototype::s_info = { "Temporal.Calendar", &Base::s_info, &temporalCalendarPrototypeTable, nullptr, CREATE_METHOD_TABLE(TemporalCalendarPrototype) };

	/* Source for TemporalCalendarPrototype.lut.h
	@begin temporalCalendarPrototypeTable
	fields temporalCalendarPrototypeFuncFields DontEnum\|Function 1
	mergeFields temporalCalendarPrototypeFuncMergeFields DontEnum\|Function 2
	toString temporalCalendarPrototypeFuncToString DontEnum\|Function 0
	toJSON temporalCalendarPrototypeFuncToJSON DontEnum\|Function 0
	id temporalCalendarPrototypeGetterId ReadOnly\|DontEnum\|CustomAccessor
	@end
	*/

	TemporalCalendarPrototype* TemporalCalendarPrototype::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
	{
	TemporalCalendarPrototype* object = new (NotNull, allocateCell<TemporalCalendarPrototype>(vm.heap)) TemporalCalendarPrototype(vm, structure);
	object->finishCreation(vm, globalObject);
	return object;
	}

	Structure* TemporalCalendarPrototype::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
	{
	return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
	}

	TemporalCalendarPrototype::TemporalCalendarPrototype(VM& vm, Structure* structure)
	: Base(vm, structure)
	{
	}

	void TemporalCalendarPrototype::finishCreation(VM& vm, JSGlobalObject*)
	{
	Base::finishCreation(vm);
	ASSERT(inherits(vm, info()));
	JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
	}

	// https://tc39.es/proposal-temporal/#sec-get-temporal.calendar.prototype.id
	JSC_DEFINE_CUSTOM_GETTER(temporalCalendarPrototypeGetterId, (JSGlobalObject* globalObject, EncodedJSValue thisValue, PropertyName))
	{
	return JSValue::encode(JSValue::decode(thisValue).toString(globalObject));
	}

	// https://tc39.es/proposal-temporal/#sup-temporal.calendar.prototype.fields
	JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncFields, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* calendar = jsDynamicCast<TemporalCalendar*>(vm, callFrame->thisValue());
	if (!calendar)
	return throwVMTypeError(globalObject, scope, "Temporal.Calendar.prototype.fields called on value that's not a Calendar"_s);

	bool isISO8601 = calendar->isISO8601();
	bool shouldAddEraAndEraYear = false;
	MarkedArgumentBuffer fieldNames;
	forEachInIterable(globalObject, callFrame->argument(0), [isISO8601, &shouldAddEraAndEraYear, &fieldNames](VM& vm, JSGlobalObject* globalObject, JSValue value) {
	auto scope = DECLARE_THROW_SCOPE(vm);
	if (!value.isString()) {
	throwTypeError(globalObject, scope, "fields include non string value"_s);
	return;
	}
	if (!isISO8601 && !shouldAddEraAndEraYear) {
	auto string = jsCast<JSString*>(value)->value(globalObject);
	RETURN_IF_EXCEPTION(scope, void());
	if (string == "year"_s)
	shouldAddEraAndEraYear = true;
	}
	fieldNames.append(value);
	});
	RETURN_IF_EXCEPTION(scope, { });

	if (shouldAddEraAndEraYear) {
	fieldNames.append(jsNontrivialString(vm, vm.propertyNames->era.impl()));
	fieldNames.append(jsNontrivialString(vm, vm.propertyNames->eraYear.impl()));
	}

	RELEASE_AND_RETURN(scope, JSValue::encode(constructArray(globalObject, static_cast<ArrayAllocationProfile*>(nullptr), fieldNames)));
	}

	// https://tc39.es/proposal-temporal/#sec-temporal-defaultmergefields
	static JSObject* defaultMergeFields(JSGlobalObject* globalObject, JSObject* fields, JSObject* additionalFields)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* merged = constructEmptyObject(globalObject);

	{
	PropertyNameArray originalKeys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
	fields->methodTable(vm)->getOwnPropertyNames(fields, globalObject, originalKeys, DontEnumPropertiesMode::Include);
	RETURN_IF_EXCEPTION(scope, { });

	for (const auto& nextKey : originalKeys) {
	if (nextKey != vm.propertyNames->month && nextKey != vm.propertyNames->monthCode) {
	JSValue propValue = fields->get(globalObject, nextKey);
	RETURN_IF_EXCEPTION(scope, { });
	if (!propValue.isUndefined()) {
	PutPropertySlot slot(merged, true);
	merged->putOwnDataProperty(vm, nextKey, propValue, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}
	}
	}

	bool includesMonthOrMonthCode = false;
	{
	PropertyNameArray newKeys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
	additionalFields->methodTable(vm)->getOwnPropertyNames(additionalFields, globalObject, newKeys, DontEnumPropertiesMode::Include);
	RETURN_IF_EXCEPTION(scope, { });

	for (const auto& nextKey : newKeys) {
	if (!includesMonthOrMonthCode) {
	if (nextKey == vm.propertyNames->month \|\| nextKey == vm.propertyNames->monthCode)
	includesMonthOrMonthCode = true;
	}

	JSValue propValue = additionalFields->get(globalObject, nextKey);
	RETURN_IF_EXCEPTION(scope, { });
	if (!propValue.isUndefined()) {
	PutPropertySlot slot(merged, true);
	merged->putOwnDataProperty(vm, nextKey, propValue, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}
	}

	if (!includesMonthOrMonthCode) {
	JSValue month = fields->get(globalObject, vm.propertyNames->month);
	RETURN_IF_EXCEPTION(scope, { });
	if (!month.isUndefined()) {
	PutPropertySlot slot(merged, true);
	merged->putOwnDataProperty(vm, vm.propertyNames->month, month, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}

	JSValue monthCode = fields->get(globalObject, vm.propertyNames->monthCode);
	RETURN_IF_EXCEPTION(scope, { });
	if (!monthCode.isUndefined()) {
	PutPropertySlot slot(merged, true);
	merged->putOwnDataProperty(vm, vm.propertyNames->monthCode, monthCode, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}

	return merged;
	}

	// https://tc39.es/proposal-temporal/#sup-temporal.calendar.prototype.mergefields
	JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncMergeFields, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* calendar = jsDynamicCast<TemporalCalendar*>(vm, callFrame->thisValue());
	if (!calendar)
	return throwVMTypeError(globalObject, scope, "Temporal.Calendar.prototype.mergeFields called on value that's not a Calendar"_s);

	auto* fields = callFrame->argument(0).toObject(globalObject);
	RETURN_IF_EXCEPTION(scope, { });

	auto* additionalFields = callFrame->argument(1).toObject(globalObject);
	RETURN_IF_EXCEPTION(scope, { });

	if (calendar->isISO8601())
	RELEASE_AND_RETURN(scope, JSValue::encode(defaultMergeFields(globalObject, fields, additionalFields)));

	auto copyObject = [](JSGlobalObject* globalObject, JSObject* object) -> JSObject* {
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* copied = constructEmptyObject(globalObject);

	PropertyNameArray keys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
	object->methodTable(vm)->getOwnPropertyNames(object, globalObject, keys, DontEnumPropertiesMode::Include);
	RETURN_IF_EXCEPTION(scope, { });

	for (const auto& key : keys) {
	JSValue propValue = object->get(globalObject, key);
	RETURN_IF_EXCEPTION(scope, { });
	if (!propValue.isUndefined()) {
	PutPropertySlot slot(copied, true);
	copied->putOwnDataProperty(vm, key, propValue, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}

	return copied;
	};

	auto* fieldsCopied = copyObject(globalObject, fields);
	RETURN_IF_EXCEPTION(scope, { });

	auto* additionalFieldsCopied = copyObject(globalObject, additionalFields);
	RETURN_IF_EXCEPTION(scope, { });

	JSValue newMonth = jsUndefined();
	JSValue newMonthCode = jsUndefined();
	JSValue newYear = jsUndefined();
	JSValue newEra = jsUndefined();
	JSValue newEraYear = jsUndefined();
	{
	PropertyNameArray keys(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
	additionalFieldsCopied->methodTable(vm)->getOwnPropertyNames(additionalFieldsCopied, globalObject, keys, DontEnumPropertiesMode::Include);
	RETURN_IF_EXCEPTION(scope, { });

	for (const auto& key : keys) {
	JSValue propValue = additionalFieldsCopied->get(globalObject, key);
	RETURN_IF_EXCEPTION(scope, { });
	if (!propValue.isUndefined()) {
	if (key == vm.propertyNames->month)
	newMonth = propValue;
	else if (key == vm.propertyNames->monthCode)
	newMonthCode = propValue;
	else if (key == vm.propertyNames->year)
	newYear = propValue;
	else if (key == vm.propertyNames->era)
	newEra = propValue;
	else if (key == vm.propertyNames->eraYear)
	newEraYear = propValue;
	else {
	PutPropertySlot slot(fieldsCopied, true);
	fieldsCopied->putOwnDataProperty(vm, key, propValue, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}
	}
	}

	if (!newMonth.isUndefined() \|\| !newMonthCode.isUndefined()) {
	{
	PutPropertySlot slot(fieldsCopied, true);
	fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->month, newMonth, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	{
	PutPropertySlot slot(fieldsCopied, true);
	fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->monthCode, newMonthCode, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}

	if (!newYear.isUndefined() \|\| !newEra.isUndefined() \|\| !newEraYear.isUndefined()) {
	{
	PutPropertySlot slot(fieldsCopied, true);
	fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->year, newYear, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	{
	PutPropertySlot slot(fieldsCopied, true);
	fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->era, newEra, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	{
	PutPropertySlot slot(fieldsCopied, true);
	fieldsCopied->putOwnDataProperty(vm, vm.propertyNames->eraYear, newEraYear, slot);
	RETURN_IF_EXCEPTION(scope, { });
	}
	}

	return JSValue::encode(fieldsCopied);
	}

	// https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.tostring
	JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncToString, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* calendar = jsDynamicCast<TemporalCalendar*>(vm, callFrame->thisValue());
	if (!calendar)
	return throwVMTypeError(globalObject, scope, "Temporal.Calendar.prototype.toString called on value that's not a Calendar"_s);

	return JSValue::encode(jsString(vm, intlAvailableCalendars()[calendar->identifier()]));
	}

	// https://tc39.es/proposal-temporal/#sec-temporal.calendar.prototype.tojson
	JSC_DEFINE_HOST_FUNCTION(temporalCalendarPrototypeFuncToJSON, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	return JSValue::encode(callFrame->thisValue().toString(globalObject));
	}

	} // namespace JSC