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

 /*
  * Copyright (C) 2020 Sony Interactive Entertainment Inc.
  * 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 "IntlLocale.h"

 #include "IntlObjectInlines.h"
 #include "JSCInlines.h"
 #include <unicode/uloc.h>
 #include <wtf/unicode/icu/ICUHelpers.h>

 namespace JSC {

 const ClassInfo IntlLocale::s_info = { "Object", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(IntlLocale) };

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

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

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

 void IntlLocale::finishCreation(VM& vm)
 {
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 }

 template<typename Visitor>
 void IntlLocale::visitChildrenImpl(JSCell* cell, Visitor& visitor)
 {
     auto* thisObject = jsCast<IntlLocale*>(cell);
     ASSERT_GC_OBJECT_INHERITS(thisObject, info());

     Base::visitChildren(thisObject, visitor);
 }

 DEFINE_VISIT_CHILDREN(IntlLocale);

 class LocaleIDBuilder final {
 public:
     bool initialize(const String&);
     CString toCanonical();

     void overrideLanguageScriptRegion(StringView language, StringView script, StringView region);
     void setKeywordValue(ASCIILiteral key, StringView value);

 private:
     Vector<char, 32> m_buffer;
 };

 bool LocaleIDBuilder::initialize(const String& tag)
 {
     if (!isStructurallyValidLanguageTag(tag))
         return false;
     ASSERT(tag.isAllASCII());
     m_buffer = localeIDBufferForLanguageTag(tag.ascii());
     return m_buffer.size();
 }

 CString LocaleIDBuilder::toCanonical()
 {
     ASSERT(m_buffer.size());

     Vector<char, 32> buffer;
     auto status = callBufferProducingFunction(uloc_canonicalize, m_buffer.data(), buffer);
     if (U_FAILURE(status))
         return CString();

     auto result = canonicalizeUnicodeExtensionsAfterICULocaleCanonicalization(WTFMove(buffer));
     return CString(result.data(), result.size());
 }

 // Because ICU's C API doesn't have set[Language|Script|Region] functions...
 void LocaleIDBuilder::overrideLanguageScriptRegion(StringView language, StringView script, StringView region)
 {
     unsigned length = strlen(m_buffer.data());
     ASSERT(length);

     StringView localeIDView { m_buffer.data(), length };

     auto endOfLanguageScriptRegionVariant = localeIDView.find(ULOC_KEYWORD_SEPARATOR);
     if (endOfLanguageScriptRegionVariant == notFound)
         endOfLanguageScriptRegionVariant = length;

     Vector<StringView> subtags;
     for (auto subtag : localeIDView.left(endOfLanguageScriptRegionVariant).splitAllowingEmptyEntries('_'))
         subtags.append(subtag);

     if (!language.isNull())
         subtags[0] = language;

     bool hasScript = subtags.size() > 1 && subtags[1].length() == 4;
     if (!script.isNull()) {
         if (hasScript)
             subtags[1] = script;
         else {
             subtags.insert(1, script);
             hasScript = true;
         }
     }

     if (!region.isNull()) {
         size_t index = hasScript ? 2 : 1;
         bool hasRegion = subtags.size() > index && subtags[index].length() < 4;
         if (hasRegion)
             subtags[index] = region;
         else
             subtags.insert(index, region);
     }

     Vector<char, 32> buffer;
     bool hasAppended = false;
     for (auto subtag : subtags) {
         if (hasAppended)
             buffer.append('_');
         else
             hasAppended = true;

         ASSERT(subtag.is8Bit() && subtag.isAllASCII());
         buffer.append(reinterpret_cast<const char*>(subtag.characters8()), subtag.length());
     }

     if (endOfLanguageScriptRegionVariant != length) {
         auto rest = localeIDView.right(length - endOfLanguageScriptRegionVariant);

         ASSERT(rest.is8Bit() && rest.isAllASCII());
         buffer.append(reinterpret_cast<const char*>(rest.characters8()), rest.length());
     }

     buffer.append('\0');
     m_buffer.swap(buffer);
 }

 void LocaleIDBuilder::setKeywordValue(ASCIILiteral key, StringView value)
 {
     ASSERT(m_buffer.size());

     ASSERT(value.is8Bit() && value.isAllASCII());
     CString rawValue { reinterpret_cast<const char*>(value.characters8()), value.length() };

     UErrorCode status = U_ZERO_ERROR;
     auto length = uloc_setKeywordValue(key.characters(), rawValue.data(), m_buffer.data(), m_buffer.size(), &status);
     // uloc_setKeywordValue does not set U_STRING_NOT_TERMINATED_WARNING.
     if (needsToGrowToProduceBuffer(status)) {
         m_buffer.grow(length + 1);
         status = U_ZERO_ERROR;
         uloc_setKeywordValue(key.characters(), rawValue.data(), m_buffer.data(), length + 1, &status);
     }
     ASSERT(U_SUCCESS(status));
 }

 String IntlLocale::keywordValue(ASCIILiteral key, bool isBoolean) const
 {
     UErrorCode status = U_ZERO_ERROR;
     Vector<char, 32> buffer(32);
     auto bufferLength = uloc_getKeywordValue(m_localeID.data(), key.characters(), buffer.data(), buffer.size(), &status);
     if (needsToGrowToProduceCString(status)) {
         buffer.grow(bufferLength + 1);
         status = U_ZERO_ERROR;
         uloc_getKeywordValue(m_localeID.data(), key.characters(), buffer.data(), bufferLength + 1, &status);
     }
     ASSERT(U_SUCCESS(status));
     if (isBoolean)
         return String(buffer.data());
     const char* value = uloc_toUnicodeLocaleType(key.characters(), buffer.data());
     if (!value)
         return nullString();
     String result(value);
     if (result == "true"_s)
         return emptyString();
     return result;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale
 void IntlLocale::initializeLocale(JSGlobalObject* globalObject, JSValue tagValue, JSValue optionsValue)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     String tag = tagValue.inherits<IntlLocale>(vm) ? jsCast<IntlLocale*>(tagValue)->toString() : tagValue.toWTFString(globalObject);
     RETURN_IF_EXCEPTION(scope, void());
     scope.release();
     initializeLocale(globalObject, tag, optionsValue);
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale
 void IntlLocale::initializeLocale(JSGlobalObject* globalObject, const String& tag, JSValue optionsValue)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     Optional<JSObject&> options = intlCoerceOptionsToObject(globalObject, optionsValue);
     RETURN_IF_EXCEPTION(scope, void());

     LocaleIDBuilder localeID;
     if (!localeID.initialize(tag)) {
         throwRangeError(globalObject, scope, "invalid language tag"_s);
         return;
     }

     String language = intlStringOption(globalObject, options, vm.propertyNames->language, { }, nullptr, nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!language.isNull() && !isUnicodeLanguageSubtag(language)) {
         throwRangeError(globalObject, scope, "language is not a well-formed language value"_s);
         return;
     }

     String script = intlStringOption(globalObject, options, vm.propertyNames->script, { }, nullptr, nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!script.isNull() && !isUnicodeScriptSubtag(script)) {
         throwRangeError(globalObject, scope, "script is not a well-formed script value"_s);
         return;
     }

     String region = intlStringOption(globalObject, options, vm.propertyNames->region, { }, nullptr, nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!region.isNull() && !isUnicodeRegionSubtag(region)) {
         throwRangeError(globalObject, scope, "region is not a well-formed region value"_s);
         return;
     }

     if (!language.isNull() || !script.isNull() || !region.isNull())
         localeID.overrideLanguageScriptRegion(language, script, region);

     String calendar = intlStringOption(globalObject, options, vm.propertyNames->calendar, { }, nullptr, nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!calendar.isNull()) {
         if (!isUnicodeLocaleIdentifierType(calendar)) {
             throwRangeError(globalObject, scope, "calendar is not a well-formed calendar value"_s);
             return;
         }
         localeID.setKeywordValue("calendar"_s, calendar);
     }

     String collation = intlStringOption(globalObject, options, vm.propertyNames->collation, { }, nullptr, nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!collation.isNull()) {
         if (!isUnicodeLocaleIdentifierType(collation)) {
             throwRangeError(globalObject, scope, "collation is not a well-formed collation value"_s);
             return;
         }
         localeID.setKeywordValue("collation"_s, collation);
     }

     String hourCycle = intlStringOption(globalObject, options, vm.propertyNames->hourCycle, { "h11", "h12", "h23", "h24" }, "hourCycle must be \"h11\", \"h12\", \"h23\", or \"h24\"", nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!hourCycle.isNull())
         localeID.setKeywordValue("hours"_s, hourCycle);

     String caseFirst = intlStringOption(globalObject, options, vm.propertyNames->caseFirst, { "upper", "lower", "false" }, "caseFirst must be either \"upper\", \"lower\", or \"false\"", nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!caseFirst.isNull())
         localeID.setKeywordValue("colcasefirst"_s, caseFirst);

     TriState numeric = intlBooleanOption(globalObject, options, vm.propertyNames->numeric);
     RETURN_IF_EXCEPTION(scope, void());
     if (numeric != TriState::Indeterminate)
         localeID.setKeywordValue("colnumeric"_s, numeric == TriState::True ? "yes" : "no");

     String numberingSystem = intlStringOption(globalObject, options, vm.propertyNames->numberingSystem, { }, nullptr, nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (!numberingSystem.isNull()) {
         if (!isUnicodeLocaleIdentifierType(numberingSystem)) {
             throwRangeError(globalObject, scope, "numberingSystem is not a well-formed numbering system value"_s);
             return;
         }
         localeID.setKeywordValue("numbers"_s, numberingSystem);
     }

     m_localeID = localeID.toCanonical();
     if (m_localeID.isNull()) {
         throwTypeError(globalObject, scope, "failed to initialize Locale"_s);
         return;
     }
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.maximize
 const String& IntlLocale::maximal()
 {
     if (m_maximal.isNull()) {
         UErrorCode status = U_ZERO_ERROR;
         Vector<char, 32> buffer(32);
         auto bufferLength = uloc_addLikelySubtags(m_localeID.data(), buffer.data(), buffer.size(), &status);
         if (needsToGrowToProduceCString(status)) {
             buffer.grow(bufferLength + 1);
             status = U_ZERO_ERROR;
             uloc_addLikelySubtags(m_localeID.data(), buffer.data(), bufferLength + 1, &status);
         }
         ASSERT(U_SUCCESS(status));

         m_maximal = languageTagForLocaleID(buffer.data());
     }
     return m_maximal;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.minimize
 const String& IntlLocale::minimal()
 {
     if (m_minimal.isNull()) {
         UErrorCode status = U_ZERO_ERROR;
         Vector<char, 32> buffer(32);
         auto bufferLength = uloc_minimizeSubtags(m_localeID.data(), buffer.data(), buffer.size(), &status);
         if (needsToGrowToProduceCString(status)) {
             buffer.grow(bufferLength + 1);
             status = U_ZERO_ERROR;
             uloc_minimizeSubtags(m_localeID.data(), buffer.data(), bufferLength + 1, &status);
         }
         ASSERT(U_SUCCESS(status));

         m_minimal = languageTagForLocaleID(buffer.data());
     }
     return m_minimal;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.toString
 const String& IntlLocale::toString()
 {
     if (m_fullString.isNull())
         m_fullString = languageTagForLocaleID(m_localeID.data());
     return m_fullString;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.baseName
 const String& IntlLocale::baseName()
 {
     if (m_baseName.isNull()) {
         UErrorCode status = U_ZERO_ERROR;
         Vector<char, 32> buffer(32);
         auto bufferLength = uloc_getBaseName(m_localeID.data(), buffer.data(), buffer.size(), &status);
         if (needsToGrowToProduceCString(status)) {
             buffer.grow(bufferLength + 1);
             status = U_ZERO_ERROR;
             uloc_getBaseName(m_localeID.data(), buffer.data(), bufferLength + 1, &status);
         }
         ASSERT(U_SUCCESS(status));

         m_baseName = languageTagForLocaleID(buffer.data());
     }
     return m_baseName;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.language
 const String& IntlLocale::language()
 {
     if (m_language.isNull()) {
         Vector<char, 8> buffer;
         auto status = callBufferProducingFunction(uloc_getLanguage, m_localeID.data(), buffer);
         ASSERT_UNUSED(status, U_SUCCESS(status));
         m_language = String(buffer.data(), buffer.size());
     }
     return m_language;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.script
 const String& IntlLocale::script()
 {
     if (m_script.isNull()) {
         Vector<char, 4> buffer;
         auto status = callBufferProducingFunction(uloc_getScript, m_localeID.data(), buffer);
         ASSERT_UNUSED(status, U_SUCCESS(status));
         m_script = String(buffer.data(), buffer.size());
     }
     return m_script;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.region
 const String& IntlLocale::region()
 {
     if (m_region.isNull()) {
         Vector<char, 3> buffer;
         auto status = callBufferProducingFunction(uloc_getCountry, m_localeID.data(), buffer);
         ASSERT_UNUSED(status, U_SUCCESS(status));
         m_region = String(buffer.data(), buffer.size());
     }
     return m_region;
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.calendar
 const String& IntlLocale::calendar()
 {
     if (!m_calendar)
         m_calendar = keywordValue("calendar"_s);
     return m_calendar.value();
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.caseFirst
 const String& IntlLocale::caseFirst()
 {
     if (!m_caseFirst)
         m_caseFirst = keywordValue("colcasefirst"_s);
     return m_caseFirst.value();
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.collation
 const String& IntlLocale::collation()
 {
     if (!m_collation)
         m_collation = keywordValue("collation"_s);
     return m_collation.value();
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.hourCycle
 const String& IntlLocale::hourCycle()
 {
     if (!m_hourCycle)
         m_hourCycle = keywordValue("hours"_s);
     return m_hourCycle.value();
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.numberingSystem
 const String& IntlLocale::numberingSystem()
 {
     if (!m_numberingSystem)
         m_numberingSystem = keywordValue("numbers"_s);
     return m_numberingSystem.value();
 }

 // https://tc39.es/ecma402/#sec-Intl.Locale.prototype.numeric
 TriState IntlLocale::numeric()
 {
     constexpr bool isBoolean = true;
     if (m_numeric == TriState::Indeterminate)
         m_numeric = triState(keywordValue("colnumeric"_s, isBoolean) == "yes"_s);
     return m_numeric;
 }

 } // namespace JSC
	/*
	* Copyright (C) 2020 Sony Interactive Entertainment Inc.
	* 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 "IntlLocale.h"

	#include "IntlObjectInlines.h"
	#include "JSCInlines.h"
	#include <unicode/uloc.h>
	#include <wtf/unicode/icu/ICUHelpers.h>

	namespace JSC {

	const ClassInfo IntlLocale::s_info = { "Object", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(IntlLocale) };

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

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

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

	void IntlLocale::finishCreation(VM& vm)
	{
	Base::finishCreation(vm);
	ASSERT(inherits(vm, info()));
	}

	template<typename Visitor>
	void IntlLocale::visitChildrenImpl(JSCell* cell, Visitor& visitor)
	{
	auto* thisObject = jsCast<IntlLocale*>(cell);
	ASSERT_GC_OBJECT_INHERITS(thisObject, info());

	Base::visitChildren(thisObject, visitor);
	}

	DEFINE_VISIT_CHILDREN(IntlLocale);

	class LocaleIDBuilder final {
	public:
	bool initialize(const String&);
	CString toCanonical();

	void overrideLanguageScriptRegion(StringView language, StringView script, StringView region);
	void setKeywordValue(ASCIILiteral key, StringView value);

	private:
	Vector<char, 32> m_buffer;
	};

	bool LocaleIDBuilder::initialize(const String& tag)
	{
	if (!isStructurallyValidLanguageTag(tag))
	return false;
	ASSERT(tag.isAllASCII());
	m_buffer = localeIDBufferForLanguageTag(tag.ascii());
	return m_buffer.size();
	}

	CString LocaleIDBuilder::toCanonical()
	{
	ASSERT(m_buffer.size());

	Vector<char, 32> buffer;
	auto status = callBufferProducingFunction(uloc_canonicalize, m_buffer.data(), buffer);
	if (U_FAILURE(status))
	return CString();

	auto result = canonicalizeUnicodeExtensionsAfterICULocaleCanonicalization(WTFMove(buffer));
	return CString(result.data(), result.size());
	}

	// Because ICU's C API doesn't have set[Language\|Script\|Region] functions...
	void LocaleIDBuilder::overrideLanguageScriptRegion(StringView language, StringView script, StringView region)
	{
	unsigned length = strlen(m_buffer.data());
	ASSERT(length);

	StringView localeIDView { m_buffer.data(), length };

	auto endOfLanguageScriptRegionVariant = localeIDView.find(ULOC_KEYWORD_SEPARATOR);
	if (endOfLanguageScriptRegionVariant == notFound)
	endOfLanguageScriptRegionVariant = length;

	Vector<StringView> subtags;
	for (auto subtag : localeIDView.left(endOfLanguageScriptRegionVariant).splitAllowingEmptyEntries('_'))
	subtags.append(subtag);

	if (!language.isNull())
	subtags[0] = language;

	bool hasScript = subtags.size() > 1 && subtags[1].length() == 4;
	if (!script.isNull()) {
	if (hasScript)
	subtags[1] = script;
	else {
	subtags.insert(1, script);
	hasScript = true;
	}
	}

	if (!region.isNull()) {
	size_t index = hasScript ? 2 : 1;
	bool hasRegion = subtags.size() > index && subtags[index].length() < 4;
	if (hasRegion)
	subtags[index] = region;
	else
	subtags.insert(index, region);
	}

	Vector<char, 32> buffer;
	bool hasAppended = false;
	for (auto subtag : subtags) {
	if (hasAppended)
	buffer.append('_');
	else
	hasAppended = true;

	ASSERT(subtag.is8Bit() && subtag.isAllASCII());
	buffer.append(reinterpret_cast<const char*>(subtag.characters8()), subtag.length());
	}

	if (endOfLanguageScriptRegionVariant != length) {
	auto rest = localeIDView.right(length - endOfLanguageScriptRegionVariant);

	ASSERT(rest.is8Bit() && rest.isAllASCII());
	buffer.append(reinterpret_cast<const char*>(rest.characters8()), rest.length());
	}

	buffer.append('\0');
	m_buffer.swap(buffer);
	}

	void LocaleIDBuilder::setKeywordValue(ASCIILiteral key, StringView value)
	{
	ASSERT(m_buffer.size());

	ASSERT(value.is8Bit() && value.isAllASCII());
	CString rawValue { reinterpret_cast<const char*>(value.characters8()), value.length() };

	UErrorCode status = U_ZERO_ERROR;
	auto length = uloc_setKeywordValue(key.characters(), rawValue.data(), m_buffer.data(), m_buffer.size(), &status);
	// uloc_setKeywordValue does not set U_STRING_NOT_TERMINATED_WARNING.
	if (needsToGrowToProduceBuffer(status)) {
	m_buffer.grow(length + 1);
	status = U_ZERO_ERROR;
	uloc_setKeywordValue(key.characters(), rawValue.data(), m_buffer.data(), length + 1, &status);
	}
	ASSERT(U_SUCCESS(status));
	}

	String IntlLocale::keywordValue(ASCIILiteral key, bool isBoolean) const
	{
	UErrorCode status = U_ZERO_ERROR;
	Vector<char, 32> buffer(32);
	auto bufferLength = uloc_getKeywordValue(m_localeID.data(), key.characters(), buffer.data(), buffer.size(), &status);
	if (needsToGrowToProduceCString(status)) {
	buffer.grow(bufferLength + 1);
	status = U_ZERO_ERROR;
	uloc_getKeywordValue(m_localeID.data(), key.characters(), buffer.data(), bufferLength + 1, &status);
	}
	ASSERT(U_SUCCESS(status));
	if (isBoolean)
	return String(buffer.data());
	const char* value = uloc_toUnicodeLocaleType(key.characters(), buffer.data());
	if (!value)
	return nullString();
	String result(value);
	if (result == "true"_s)
	return emptyString();
	return result;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale
	void IntlLocale::initializeLocale(JSGlobalObject* globalObject, JSValue tagValue, JSValue optionsValue)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	String tag = tagValue.inherits<IntlLocale>(vm) ? jsCast<IntlLocale*>(tagValue)->toString() : tagValue.toWTFString(globalObject);
	RETURN_IF_EXCEPTION(scope, void());
	scope.release();
	initializeLocale(globalObject, tag, optionsValue);
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale
	void IntlLocale::initializeLocale(JSGlobalObject* globalObject, const String& tag, JSValue optionsValue)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	Optional<JSObject&> options = intlCoerceOptionsToObject(globalObject, optionsValue);
	RETURN_IF_EXCEPTION(scope, void());

	LocaleIDBuilder localeID;
	if (!localeID.initialize(tag)) {
	throwRangeError(globalObject, scope, "invalid language tag"_s);
	return;
	}

	String language = intlStringOption(globalObject, options, vm.propertyNames->language, { }, nullptr, nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!language.isNull() && !isUnicodeLanguageSubtag(language)) {
	throwRangeError(globalObject, scope, "language is not a well-formed language value"_s);
	return;
	}

	String script = intlStringOption(globalObject, options, vm.propertyNames->script, { }, nullptr, nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!script.isNull() && !isUnicodeScriptSubtag(script)) {
	throwRangeError(globalObject, scope, "script is not a well-formed script value"_s);
	return;
	}

	String region = intlStringOption(globalObject, options, vm.propertyNames->region, { }, nullptr, nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!region.isNull() && !isUnicodeRegionSubtag(region)) {
	throwRangeError(globalObject, scope, "region is not a well-formed region value"_s);
	return;
	}

	if (!language.isNull() \|\| !script.isNull() \|\| !region.isNull())
	localeID.overrideLanguageScriptRegion(language, script, region);

	String calendar = intlStringOption(globalObject, options, vm.propertyNames->calendar, { }, nullptr, nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!calendar.isNull()) {
	if (!isUnicodeLocaleIdentifierType(calendar)) {
	throwRangeError(globalObject, scope, "calendar is not a well-formed calendar value"_s);
	return;
	}
	localeID.setKeywordValue("calendar"_s, calendar);
	}

	String collation = intlStringOption(globalObject, options, vm.propertyNames->collation, { }, nullptr, nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!collation.isNull()) {
	if (!isUnicodeLocaleIdentifierType(collation)) {
	throwRangeError(globalObject, scope, "collation is not a well-formed collation value"_s);
	return;
	}
	localeID.setKeywordValue("collation"_s, collation);
	}

	String hourCycle = intlStringOption(globalObject, options, vm.propertyNames->hourCycle, { "h11", "h12", "h23", "h24" }, "hourCycle must be \"h11\", \"h12\", \"h23\", or \"h24\"", nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!hourCycle.isNull())
	localeID.setKeywordValue("hours"_s, hourCycle);

	String caseFirst = intlStringOption(globalObject, options, vm.propertyNames->caseFirst, { "upper", "lower", "false" }, "caseFirst must be either \"upper\", \"lower\", or \"false\"", nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!caseFirst.isNull())
	localeID.setKeywordValue("colcasefirst"_s, caseFirst);

	TriState numeric = intlBooleanOption(globalObject, options, vm.propertyNames->numeric);
	RETURN_IF_EXCEPTION(scope, void());
	if (numeric != TriState::Indeterminate)
	localeID.setKeywordValue("colnumeric"_s, numeric == TriState::True ? "yes" : "no");

	String numberingSystem = intlStringOption(globalObject, options, vm.propertyNames->numberingSystem, { }, nullptr, nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (!numberingSystem.isNull()) {
	if (!isUnicodeLocaleIdentifierType(numberingSystem)) {
	throwRangeError(globalObject, scope, "numberingSystem is not a well-formed numbering system value"_s);
	return;
	}
	localeID.setKeywordValue("numbers"_s, numberingSystem);
	}

	m_localeID = localeID.toCanonical();
	if (m_localeID.isNull()) {
	throwTypeError(globalObject, scope, "failed to initialize Locale"_s);
	return;
	}
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.maximize
	const String& IntlLocale::maximal()
	{
	if (m_maximal.isNull()) {
	UErrorCode status = U_ZERO_ERROR;
	Vector<char, 32> buffer(32);
	auto bufferLength = uloc_addLikelySubtags(m_localeID.data(), buffer.data(), buffer.size(), &status);
	if (needsToGrowToProduceCString(status)) {
	buffer.grow(bufferLength + 1);
	status = U_ZERO_ERROR;
	uloc_addLikelySubtags(m_localeID.data(), buffer.data(), bufferLength + 1, &status);
	}
	ASSERT(U_SUCCESS(status));

	m_maximal = languageTagForLocaleID(buffer.data());
	}
	return m_maximal;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.minimize
	const String& IntlLocale::minimal()
	{
	if (m_minimal.isNull()) {
	UErrorCode status = U_ZERO_ERROR;
	Vector<char, 32> buffer(32);
	auto bufferLength = uloc_minimizeSubtags(m_localeID.data(), buffer.data(), buffer.size(), &status);
	if (needsToGrowToProduceCString(status)) {
	buffer.grow(bufferLength + 1);
	status = U_ZERO_ERROR;
	uloc_minimizeSubtags(m_localeID.data(), buffer.data(), bufferLength + 1, &status);
	}
	ASSERT(U_SUCCESS(status));

	m_minimal = languageTagForLocaleID(buffer.data());
	}
	return m_minimal;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.toString
	const String& IntlLocale::toString()
	{
	if (m_fullString.isNull())
	m_fullString = languageTagForLocaleID(m_localeID.data());
	return m_fullString;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.baseName
	const String& IntlLocale::baseName()
	{
	if (m_baseName.isNull()) {
	UErrorCode status = U_ZERO_ERROR;
	Vector<char, 32> buffer(32);
	auto bufferLength = uloc_getBaseName(m_localeID.data(), buffer.data(), buffer.size(), &status);
	if (needsToGrowToProduceCString(status)) {
	buffer.grow(bufferLength + 1);
	status = U_ZERO_ERROR;
	uloc_getBaseName(m_localeID.data(), buffer.data(), bufferLength + 1, &status);
	}
	ASSERT(U_SUCCESS(status));

	m_baseName = languageTagForLocaleID(buffer.data());
	}
	return m_baseName;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.language
	const String& IntlLocale::language()
	{
	if (m_language.isNull()) {
	Vector<char, 8> buffer;
	auto status = callBufferProducingFunction(uloc_getLanguage, m_localeID.data(), buffer);
	ASSERT_UNUSED(status, U_SUCCESS(status));
	m_language = String(buffer.data(), buffer.size());
	}
	return m_language;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.script
	const String& IntlLocale::script()
	{
	if (m_script.isNull()) {
	Vector<char, 4> buffer;
	auto status = callBufferProducingFunction(uloc_getScript, m_localeID.data(), buffer);
	ASSERT_UNUSED(status, U_SUCCESS(status));
	m_script = String(buffer.data(), buffer.size());
	}
	return m_script;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.region
	const String& IntlLocale::region()
	{
	if (m_region.isNull()) {
	Vector<char, 3> buffer;
	auto status = callBufferProducingFunction(uloc_getCountry, m_localeID.data(), buffer);
	ASSERT_UNUSED(status, U_SUCCESS(status));
	m_region = String(buffer.data(), buffer.size());
	}
	return m_region;
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.calendar
	const String& IntlLocale::calendar()
	{
	if (!m_calendar)
	m_calendar = keywordValue("calendar"_s);
	return m_calendar.value();
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.caseFirst
	const String& IntlLocale::caseFirst()
	{
	if (!m_caseFirst)
	m_caseFirst = keywordValue("colcasefirst"_s);
	return m_caseFirst.value();
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.collation
	const String& IntlLocale::collation()
	{
	if (!m_collation)
	m_collation = keywordValue("collation"_s);
	return m_collation.value();
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.hourCycle
	const String& IntlLocale::hourCycle()
	{
	if (!m_hourCycle)
	m_hourCycle = keywordValue("hours"_s);
	return m_hourCycle.value();
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.numberingSystem
	const String& IntlLocale::numberingSystem()
	{
	if (!m_numberingSystem)
	m_numberingSystem = keywordValue("numbers"_s);
	return m_numberingSystem.value();
	}

	// https://tc39.es/ecma402/#sec-Intl.Locale.prototype.numeric
	TriState IntlLocale::numeric()
	{
	constexpr bool isBoolean = true;
	if (m_numeric == TriState::Indeterminate)
	m_numeric = triState(keywordValue("colnumeric"_s, isBoolean) == "yes"_s);
	return m_numeric;
	}

	} // namespace JSC