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

 /*
  * Copyright (C) 2015 Andy VanWagoner (andy@vanwagoner.family)
  * Copyright (C) 2015 Sukolsak Sakshuwong (sukolsak@gmail.com)
  * Copyright (C) 2016-2019 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 "IntlCollator.h"

 #if ENABLE(INTL)

 #include "CatchScope.h"
 #include "Error.h"
 #include "IntlCollatorConstructor.h"
 #include "IntlObject.h"
 #include "JSBoundFunction.h"
 #include "JSCInlines.h"
 #include "ObjectConstructor.h"
 #include "SlotVisitorInlines.h"
 #include "StructureInlines.h"
 #include <unicode/ucol.h>
 #include <wtf/unicode/Collator.h>

 namespace JSC {

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

 static const char* const relevantCollatorExtensionKeys[3] = { "co", "kn", "kf" };
 static const size_t indexOfExtensionKeyCo = 0;
 static const size_t indexOfExtensionKeyKn = 1;
 static const size_t indexOfExtensionKeyKf = 2;

 void IntlCollator::UCollatorDeleter::operator()(UCollator* collator) const
 {
     if (collator)
         ucol_close(collator);
 }

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

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

 IntlCollator::IntlCollator(VM& vm, Structure* structure)
     : JSDestructibleObject(vm, structure)
 {
 }

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

 void IntlCollator::destroy(JSCell* cell)
 {
     static_cast<IntlCollator*>(cell)->IntlCollator::~IntlCollator();
 }

 void IntlCollator::visitChildren(JSCell* cell, SlotVisitor& visitor)
 {
     IntlCollator* thisObject = jsCast<IntlCollator*>(cell);
     ASSERT_GC_OBJECT_INHERITS(thisObject, info());

     Base::visitChildren(thisObject, visitor);

     visitor.append(thisObject->m_boundCompare);
 }

 static Vector<String> sortLocaleData(const String& locale, size_t keyIndex)
 {
     // 9.1 Internal slots of Service Constructors & 10.2.3 Internal slots (ECMA-402 2.0)
     Vector<String> keyLocaleData;
     switch (keyIndex) {
     case indexOfExtensionKeyCo: {
         // 10.2.3 "The first element of [[sortLocaleData]][locale].co and [[searchLocaleData]][locale].co must be null for all locale values."
         keyLocaleData.append({ });

         UErrorCode status = U_ZERO_ERROR;
         UEnumeration* enumeration = ucol_getKeywordValuesForLocale("collation", locale.utf8().data(), false, &status);
         if (U_SUCCESS(status)) {
             const char* collation;
             while ((collation = uenum_next(enumeration, nullptr, &status)) && U_SUCCESS(status)) {
                 // 10.2.3 "The values "standard" and "search" must not be used as elements in any [[sortLocaleData]][locale].co and [[searchLocaleData]][locale].co array."
                 if (!strcmp(collation, "standard") || !strcmp(collation, "search"))
                     continue;

                 // Map keyword values to BCP 47 equivalents.
                 if (!strcmp(collation, "dictionary"))
                     collation = "dict";
                 else if (!strcmp(collation, "gb2312han"))
                     collation = "gb2312";
                 else if (!strcmp(collation, "phonebook"))
                     collation = "phonebk";
                 else if (!strcmp(collation, "traditional"))
                     collation = "trad";

                 keyLocaleData.append(collation);
             }
             uenum_close(enumeration);
         }
         break;
     }
     case indexOfExtensionKeyKn:
         keyLocaleData.reserveInitialCapacity(2);
         keyLocaleData.uncheckedAppend("false"_s);
         keyLocaleData.uncheckedAppend("true"_s);
         break;
     case indexOfExtensionKeyKf:
         keyLocaleData.reserveInitialCapacity(3);
         keyLocaleData.uncheckedAppend("false"_s);
         keyLocaleData.uncheckedAppend("lower"_s);
         keyLocaleData.uncheckedAppend("upper"_s);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
     return keyLocaleData;
 }

 static Vector<String> searchLocaleData(const String&, size_t keyIndex)
 {
     // 9.1 Internal slots of Service Constructors & 10.2.3 Internal slots (ECMA-402 2.0)
     Vector<String> keyLocaleData;
     switch (keyIndex) {
     case indexOfExtensionKeyCo:
         // 10.2.3 "The first element of [[sortLocaleData]][locale].co and [[searchLocaleData]][locale].co must be null for all locale values."
         keyLocaleData.reserveInitialCapacity(1);
         keyLocaleData.append({ });
         break;
     case indexOfExtensionKeyKn:
         keyLocaleData.reserveInitialCapacity(2);
         keyLocaleData.uncheckedAppend("false"_s);
         keyLocaleData.uncheckedAppend("true"_s);
         break;
     case indexOfExtensionKeyKf:
         keyLocaleData.reserveInitialCapacity(3);
         keyLocaleData.uncheckedAppend("false"_s);
         keyLocaleData.uncheckedAppend("lower"_s);
         keyLocaleData.uncheckedAppend("upper"_s);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
     return keyLocaleData;
 }

 void IntlCollator::initializeCollator(JSGlobalObject* globalObject, JSValue locales, JSValue optionsValue)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     // 10.1.1 InitializeCollator (collator, locales, options) (ECMA-402)
     // https://tc39.github.io/ecma402/#sec-initializecollator

     auto requestedLocales = canonicalizeLocaleList(globalObject, locales);
     RETURN_IF_EXCEPTION(scope, void());

     JSObject* options;
     if (optionsValue.isUndefined())
         options = constructEmptyObject(vm, globalObject->nullPrototypeObjectStructure());
     else {
         options = optionsValue.toObject(globalObject);
         RETURN_IF_EXCEPTION(scope, void());
     }

     String usageString = intlStringOption(globalObject, options, vm.propertyNames->usage, { "sort", "search" }, "usage must be either \"sort\" or \"search\"", "sort");
     RETURN_IF_EXCEPTION(scope, void());
     if (usageString == "sort")
         m_usage = Usage::Sort;
     else if (usageString == "search")
         m_usage = Usage::Search;
     else
         ASSERT_NOT_REACHED();

     auto localeData = (m_usage == Usage::Sort) ? sortLocaleData : searchLocaleData;

     HashMap<String, String> opt;

     String matcher = intlStringOption(globalObject, options, vm.propertyNames->localeMatcher, { "lookup", "best fit" }, "localeMatcher must be either \"lookup\" or \"best fit\"", "best fit");
     RETURN_IF_EXCEPTION(scope, void());
     opt.add("localeMatcher"_s, matcher);

     {
         String numericString;
         bool usesFallback;
         bool numeric = intlBooleanOption(globalObject, options, vm.propertyNames->numeric, usesFallback);
         RETURN_IF_EXCEPTION(scope, void());
         if (!usesFallback)
             numericString = numeric ? "true"_s : "false"_s;
         if (!numericString.isNull())
             opt.add("kn"_s, numericString);
     }
     {
         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())
             opt.add("kf"_s, caseFirst);
     }

     auto& availableLocales = globalObject->intlCollatorAvailableLocales();
     auto result = resolveLocale(globalObject, availableLocales, requestedLocales, opt, relevantCollatorExtensionKeys, WTF_ARRAY_LENGTH(relevantCollatorExtensionKeys), localeData);

     m_locale = result.get("locale"_s);
     if (m_locale.isEmpty()) {
         throwTypeError(globalObject, scope, "failed to initialize Collator due to invalid locale"_s);
         return;
     }

     const String& collation = result.get("co"_s);
     m_collation = collation.isNull() ? "default"_s : collation;
     m_numeric = result.get("kn"_s) == "true";

     const String& caseFirst = result.get("kf"_s);
     if (caseFirst == "lower")
         m_caseFirst = CaseFirst::Lower;
     else if (caseFirst == "upper")
         m_caseFirst = CaseFirst::Upper;
     else
         m_caseFirst = CaseFirst::False;

     String sensitivityString = intlStringOption(globalObject, options, vm.propertyNames->sensitivity, { "base", "accent", "case", "variant" }, "sensitivity must be either \"base\", \"accent\", \"case\", or \"variant\"", nullptr);
     RETURN_IF_EXCEPTION(scope, void());
     if (sensitivityString == "base")
         m_sensitivity = Sensitivity::Base;
     else if (sensitivityString == "accent")
         m_sensitivity = Sensitivity::Accent;
     else if (sensitivityString == "case")
         m_sensitivity = Sensitivity::Case;
     else
         m_sensitivity = Sensitivity::Variant;

     bool usesFallback;
     bool ignorePunctuation = intlBooleanOption(globalObject, options, vm.propertyNames->ignorePunctuation, usesFallback);
     if (usesFallback)
         ignorePunctuation = false;
     RETURN_IF_EXCEPTION(scope, void());
     m_ignorePunctuation = ignorePunctuation;

     m_initializedCollator = true;
 }

 void IntlCollator::createCollator(JSGlobalObject* globalObject)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_CATCH_SCOPE(vm);
     ASSERT(!m_collator);

     if (!m_initializedCollator) {
         initializeCollator(globalObject, jsUndefined(), jsUndefined());
         scope.assertNoException();
     }

     UErrorCode status = U_ZERO_ERROR;
     auto collator = std::unique_ptr<UCollator, UCollatorDeleter>(ucol_open(m_locale.utf8().data(), &status));
     if (U_FAILURE(status))
         return;

     UColAttributeValue strength = UCOL_PRIMARY;
     UColAttributeValue caseLevel = UCOL_OFF;
     UColAttributeValue caseFirst = UCOL_OFF;
     switch (m_sensitivity) {
     case Sensitivity::Base:
         break;
     case Sensitivity::Accent:
         strength = UCOL_SECONDARY;
         break;
     case Sensitivity::Case:
         caseLevel = UCOL_ON;
         break;
     case Sensitivity::Variant:
         strength = UCOL_TERTIARY;
         break;
     }
     switch (m_caseFirst) {
     case CaseFirst::False:
         break;
     case CaseFirst::Lower:
         caseFirst = UCOL_LOWER_FIRST;
         break;
     case CaseFirst::Upper:
         caseFirst = UCOL_UPPER_FIRST;
         break;
     }

     ucol_setAttribute(collator.get(), UCOL_STRENGTH, strength, &status);
     ucol_setAttribute(collator.get(), UCOL_CASE_LEVEL, caseLevel, &status);
     ucol_setAttribute(collator.get(), UCOL_CASE_FIRST, caseFirst, &status);
     ucol_setAttribute(collator.get(), UCOL_NUMERIC_COLLATION, m_numeric ? UCOL_ON : UCOL_OFF, &status);

     // FIXME: Setting UCOL_ALTERNATE_HANDLING to UCOL_SHIFTED causes punctuation and whitespace to be
     // ignored. There is currently no way to ignore only punctuation.
     ucol_setAttribute(collator.get(), UCOL_ALTERNATE_HANDLING, m_ignorePunctuation ? UCOL_SHIFTED : UCOL_DEFAULT, &status);

     // "The method is required to return 0 when comparing Strings that are considered canonically
     // equivalent by the Unicode standard."
     ucol_setAttribute(collator.get(), UCOL_NORMALIZATION_MODE, UCOL_ON, &status);
     if (U_FAILURE(status))
         return;

     m_collator = WTFMove(collator);
 }

 JSValue IntlCollator::compareStrings(JSGlobalObject* globalObject, StringView x, StringView y)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     // 10.3.4 CompareStrings abstract operation (ECMA-402 2.0)
     if (!m_collator) {
         createCollator(globalObject);
         if (!m_collator)
             return throwException(globalObject, scope, createError(globalObject, "Failed to compare strings."_s));
     }

     UErrorCode status = U_ZERO_ERROR;
     UCharIterator iteratorX = createIterator(x);
     UCharIterator iteratorY = createIterator(y);
     auto result = ucol_strcollIter(m_collator.get(), &iteratorX, &iteratorY, &status);
     if (U_FAILURE(status))
         return throwException(globalObject, scope, createError(globalObject, "Failed to compare strings."_s));
     return jsNumber(result);
 }

 ASCIILiteral IntlCollator::usageString(Usage usage)
 {
     switch (usage) {
     case Usage::Sort:
         return "sort"_s;
     case Usage::Search:
         return "search"_s;
     }
     ASSERT_NOT_REACHED();
     return ASCIILiteral::null();
 }

 ASCIILiteral IntlCollator::sensitivityString(Sensitivity sensitivity)
 {
     switch (sensitivity) {
     case Sensitivity::Base:
         return "base"_s;
     case Sensitivity::Accent:
         return "accent"_s;
     case Sensitivity::Case:
         return "case"_s;
     case Sensitivity::Variant:
         return "variant"_s;
     }
     ASSERT_NOT_REACHED();
     return ASCIILiteral::null();
 }

 ASCIILiteral IntlCollator::caseFirstString(CaseFirst caseFirst)
 {
     switch (caseFirst) {
     case CaseFirst::False:
         return "false"_s;
     case CaseFirst::Lower:
         return "lower"_s;
     case CaseFirst::Upper:
         return "upper"_s;
     }
     ASSERT_NOT_REACHED();
     return ASCIILiteral::null();
 }

 JSObject* IntlCollator::resolvedOptions(JSGlobalObject* globalObject)
 {
     VM& vm = globalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     // 10.3.5 Intl.Collator.prototype.resolvedOptions() (ECMA-402 2.0)
     // The function returns a new object whose properties and attributes are set as if
     // constructed by an object literal assigning to each of the following properties the
     // value of the corresponding internal slot of this Collator object (see 10.4): locale,
     // usage, sensitivity, ignorePunctuation, collation, as well as those properties shown
     // in Table 1 whose keys are included in the %Collator%[[relevantExtensionKeys]]
     // internal slot of the standard built-in object that is the initial value of
     // Intl.Collator.

     if (!m_initializedCollator) {
         initializeCollator(globalObject, jsUndefined(), jsUndefined());
         scope.assertNoException();
     }

     JSObject* options = constructEmptyObject(globalObject);
     options->putDirect(vm, vm.propertyNames->locale, jsString(vm, m_locale));
     options->putDirect(vm, vm.propertyNames->usage, jsNontrivialString(vm, usageString(m_usage)));
     options->putDirect(vm, vm.propertyNames->sensitivity, jsNontrivialString(vm, sensitivityString(m_sensitivity)));
     options->putDirect(vm, vm.propertyNames->ignorePunctuation, jsBoolean(m_ignorePunctuation));
     options->putDirect(vm, vm.propertyNames->collation, jsString(vm, m_collation));
     options->putDirect(vm, vm.propertyNames->numeric, jsBoolean(m_numeric));
     options->putDirect(vm, vm.propertyNames->caseFirst, jsNontrivialString(vm, caseFirstString(m_caseFirst)));
     return options;
 }

 void IntlCollator::setBoundCompare(VM& vm, JSBoundFunction* format)
 {
     m_boundCompare.set(vm, this, format);
 }

 } // namespace JSC

 #endif // ENABLE(INTL)
	/*
	* Copyright (C) 2015 Andy VanWagoner (andy@vanwagoner.family)
	* Copyright (C) 2015 Sukolsak Sakshuwong (sukolsak@gmail.com)
	* Copyright (C) 2016-2019 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 "IntlCollator.h"

	#if ENABLE(INTL)

	#include "CatchScope.h"
	#include "Error.h"
	#include "IntlCollatorConstructor.h"
	#include "IntlObject.h"
	#include "JSBoundFunction.h"
	#include "JSCInlines.h"
	#include "ObjectConstructor.h"
	#include "SlotVisitorInlines.h"
	#include "StructureInlines.h"
	#include <unicode/ucol.h>
	#include <wtf/unicode/Collator.h>

	namespace JSC {

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

	static const char* const relevantCollatorExtensionKeys[3] = { "co", "kn", "kf" };
	static const size_t indexOfExtensionKeyCo = 0;
	static const size_t indexOfExtensionKeyKn = 1;
	static const size_t indexOfExtensionKeyKf = 2;

	void IntlCollator::UCollatorDeleter::operator()(UCollator* collator) const
	{
	if (collator)
	ucol_close(collator);
	}

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

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

	IntlCollator::IntlCollator(VM& vm, Structure* structure)
	: JSDestructibleObject(vm, structure)
	{
	}

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

	void IntlCollator::destroy(JSCell* cell)
	{
	static_cast<IntlCollator*>(cell)->IntlCollator::~IntlCollator();
	}

	void IntlCollator::visitChildren(JSCell* cell, SlotVisitor& visitor)
	{
	IntlCollator* thisObject = jsCast<IntlCollator*>(cell);
	ASSERT_GC_OBJECT_INHERITS(thisObject, info());

	Base::visitChildren(thisObject, visitor);

	visitor.append(thisObject->m_boundCompare);
	}

	static Vector<String> sortLocaleData(const String& locale, size_t keyIndex)
	{
	// 9.1 Internal slots of Service Constructors & 10.2.3 Internal slots (ECMA-402 2.0)
	Vector<String> keyLocaleData;
	switch (keyIndex) {
	case indexOfExtensionKeyCo: {
	// 10.2.3 "The first element of [[sortLocaleData]][locale].co and [[searchLocaleData]][locale].co must be null for all locale values."
	keyLocaleData.append({ });

	UErrorCode status = U_ZERO_ERROR;
	UEnumeration* enumeration = ucol_getKeywordValuesForLocale("collation", locale.utf8().data(), false, &status);
	if (U_SUCCESS(status)) {
	const char* collation;
	while ((collation = uenum_next(enumeration, nullptr, &status)) && U_SUCCESS(status)) {
	// 10.2.3 "The values "standard" and "search" must not be used as elements in any [[sortLocaleData]][locale].co and [[searchLocaleData]][locale].co array."
	if (!strcmp(collation, "standard") \|\| !strcmp(collation, "search"))
	continue;

	// Map keyword values to BCP 47 equivalents.
	if (!strcmp(collation, "dictionary"))
	collation = "dict";
	else if (!strcmp(collation, "gb2312han"))
	collation = "gb2312";
	else if (!strcmp(collation, "phonebook"))
	collation = "phonebk";
	else if (!strcmp(collation, "traditional"))
	collation = "trad";

	keyLocaleData.append(collation);
	}
	uenum_close(enumeration);
	}
	break;
	}
	case indexOfExtensionKeyKn:
	keyLocaleData.reserveInitialCapacity(2);
	keyLocaleData.uncheckedAppend("false"_s);
	keyLocaleData.uncheckedAppend("true"_s);
	break;
	case indexOfExtensionKeyKf:
	keyLocaleData.reserveInitialCapacity(3);
	keyLocaleData.uncheckedAppend("false"_s);
	keyLocaleData.uncheckedAppend("lower"_s);
	keyLocaleData.uncheckedAppend("upper"_s);
	break;
	default:
	ASSERT_NOT_REACHED();
	}
	return keyLocaleData;
	}

	static Vector<String> searchLocaleData(const String&, size_t keyIndex)
	{
	// 9.1 Internal slots of Service Constructors & 10.2.3 Internal slots (ECMA-402 2.0)
	Vector<String> keyLocaleData;
	switch (keyIndex) {
	case indexOfExtensionKeyCo:
	// 10.2.3 "The first element of [[sortLocaleData]][locale].co and [[searchLocaleData]][locale].co must be null for all locale values."
	keyLocaleData.reserveInitialCapacity(1);
	keyLocaleData.append({ });
	break;
	case indexOfExtensionKeyKn:
	keyLocaleData.reserveInitialCapacity(2);
	keyLocaleData.uncheckedAppend("false"_s);
	keyLocaleData.uncheckedAppend("true"_s);
	break;
	case indexOfExtensionKeyKf:
	keyLocaleData.reserveInitialCapacity(3);
	keyLocaleData.uncheckedAppend("false"_s);
	keyLocaleData.uncheckedAppend("lower"_s);
	keyLocaleData.uncheckedAppend("upper"_s);
	break;
	default:
	ASSERT_NOT_REACHED();
	}
	return keyLocaleData;
	}

	void IntlCollator::initializeCollator(JSGlobalObject* globalObject, JSValue locales, JSValue optionsValue)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	// 10.1.1 InitializeCollator (collator, locales, options) (ECMA-402)
	// https://tc39.github.io/ecma402/#sec-initializecollator

	auto requestedLocales = canonicalizeLocaleList(globalObject, locales);
	RETURN_IF_EXCEPTION(scope, void());

	JSObject* options;
	if (optionsValue.isUndefined())
	options = constructEmptyObject(vm, globalObject->nullPrototypeObjectStructure());
	else {
	options = optionsValue.toObject(globalObject);
	RETURN_IF_EXCEPTION(scope, void());
	}

	String usageString = intlStringOption(globalObject, options, vm.propertyNames->usage, { "sort", "search" }, "usage must be either \"sort\" or \"search\"", "sort");
	RETURN_IF_EXCEPTION(scope, void());
	if (usageString == "sort")
	m_usage = Usage::Sort;
	else if (usageString == "search")
	m_usage = Usage::Search;
	else
	ASSERT_NOT_REACHED();

	auto localeData = (m_usage == Usage::Sort) ? sortLocaleData : searchLocaleData;

	HashMap<String, String> opt;

	String matcher = intlStringOption(globalObject, options, vm.propertyNames->localeMatcher, { "lookup", "best fit" }, "localeMatcher must be either \"lookup\" or \"best fit\"", "best fit");
	RETURN_IF_EXCEPTION(scope, void());
	opt.add("localeMatcher"_s, matcher);

	{
	String numericString;
	bool usesFallback;
	bool numeric = intlBooleanOption(globalObject, options, vm.propertyNames->numeric, usesFallback);
	RETURN_IF_EXCEPTION(scope, void());
	if (!usesFallback)
	numericString = numeric ? "true"_s : "false"_s;
	if (!numericString.isNull())
	opt.add("kn"_s, numericString);
	}
	{
	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())
	opt.add("kf"_s, caseFirst);
	}

	auto& availableLocales = globalObject->intlCollatorAvailableLocales();
	auto result = resolveLocale(globalObject, availableLocales, requestedLocales, opt, relevantCollatorExtensionKeys, WTF_ARRAY_LENGTH(relevantCollatorExtensionKeys), localeData);

	m_locale = result.get("locale"_s);
	if (m_locale.isEmpty()) {
	throwTypeError(globalObject, scope, "failed to initialize Collator due to invalid locale"_s);
	return;
	}

	const String& collation = result.get("co"_s);
	m_collation = collation.isNull() ? "default"_s : collation;
	m_numeric = result.get("kn"_s) == "true";

	const String& caseFirst = result.get("kf"_s);
	if (caseFirst == "lower")
	m_caseFirst = CaseFirst::Lower;
	else if (caseFirst == "upper")
	m_caseFirst = CaseFirst::Upper;
	else
	m_caseFirst = CaseFirst::False;

	String sensitivityString = intlStringOption(globalObject, options, vm.propertyNames->sensitivity, { "base", "accent", "case", "variant" }, "sensitivity must be either \"base\", \"accent\", \"case\", or \"variant\"", nullptr);
	RETURN_IF_EXCEPTION(scope, void());
	if (sensitivityString == "base")
	m_sensitivity = Sensitivity::Base;
	else if (sensitivityString == "accent")
	m_sensitivity = Sensitivity::Accent;
	else if (sensitivityString == "case")
	m_sensitivity = Sensitivity::Case;
	else
	m_sensitivity = Sensitivity::Variant;

	bool usesFallback;
	bool ignorePunctuation = intlBooleanOption(globalObject, options, vm.propertyNames->ignorePunctuation, usesFallback);
	if (usesFallback)
	ignorePunctuation = false;
	RETURN_IF_EXCEPTION(scope, void());
	m_ignorePunctuation = ignorePunctuation;

	m_initializedCollator = true;
	}

	void IntlCollator::createCollator(JSGlobalObject* globalObject)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_CATCH_SCOPE(vm);
	ASSERT(!m_collator);

	if (!m_initializedCollator) {
	initializeCollator(globalObject, jsUndefined(), jsUndefined());
	scope.assertNoException();
	}

	UErrorCode status = U_ZERO_ERROR;
	auto collator = std::unique_ptr<UCollator, UCollatorDeleter>(ucol_open(m_locale.utf8().data(), &status));
	if (U_FAILURE(status))
	return;

	UColAttributeValue strength = UCOL_PRIMARY;
	UColAttributeValue caseLevel = UCOL_OFF;
	UColAttributeValue caseFirst = UCOL_OFF;
	switch (m_sensitivity) {
	case Sensitivity::Base:
	break;
	case Sensitivity::Accent:
	strength = UCOL_SECONDARY;
	break;
	case Sensitivity::Case:
	caseLevel = UCOL_ON;
	break;
	case Sensitivity::Variant:
	strength = UCOL_TERTIARY;
	break;
	}
	switch (m_caseFirst) {
	case CaseFirst::False:
	break;
	case CaseFirst::Lower:
	caseFirst = UCOL_LOWER_FIRST;
	break;
	case CaseFirst::Upper:
	caseFirst = UCOL_UPPER_FIRST;
	break;
	}

	ucol_setAttribute(collator.get(), UCOL_STRENGTH, strength, &status);
	ucol_setAttribute(collator.get(), UCOL_CASE_LEVEL, caseLevel, &status);
	ucol_setAttribute(collator.get(), UCOL_CASE_FIRST, caseFirst, &status);
	ucol_setAttribute(collator.get(), UCOL_NUMERIC_COLLATION, m_numeric ? UCOL_ON : UCOL_OFF, &status);

	// FIXME: Setting UCOL_ALTERNATE_HANDLING to UCOL_SHIFTED causes punctuation and whitespace to be
	// ignored. There is currently no way to ignore only punctuation.
	ucol_setAttribute(collator.get(), UCOL_ALTERNATE_HANDLING, m_ignorePunctuation ? UCOL_SHIFTED : UCOL_DEFAULT, &status);

	// "The method is required to return 0 when comparing Strings that are considered canonically
	// equivalent by the Unicode standard."
	ucol_setAttribute(collator.get(), UCOL_NORMALIZATION_MODE, UCOL_ON, &status);
	if (U_FAILURE(status))
	return;

	m_collator = WTFMove(collator);
	}

	JSValue IntlCollator::compareStrings(JSGlobalObject* globalObject, StringView x, StringView y)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	// 10.3.4 CompareStrings abstract operation (ECMA-402 2.0)
	if (!m_collator) {
	createCollator(globalObject);
	if (!m_collator)
	return throwException(globalObject, scope, createError(globalObject, "Failed to compare strings."_s));
	}

	UErrorCode status = U_ZERO_ERROR;
	UCharIterator iteratorX = createIterator(x);
	UCharIterator iteratorY = createIterator(y);
	auto result = ucol_strcollIter(m_collator.get(), &iteratorX, &iteratorY, &status);
	if (U_FAILURE(status))
	return throwException(globalObject, scope, createError(globalObject, "Failed to compare strings."_s));
	return jsNumber(result);
	}

	ASCIILiteral IntlCollator::usageString(Usage usage)
	{
	switch (usage) {
	case Usage::Sort:
	return "sort"_s;
	case Usage::Search:
	return "search"_s;
	}
	ASSERT_NOT_REACHED();
	return ASCIILiteral::null();
	}

	ASCIILiteral IntlCollator::sensitivityString(Sensitivity sensitivity)
	{
	switch (sensitivity) {
	case Sensitivity::Base:
	return "base"_s;
	case Sensitivity::Accent:
	return "accent"_s;
	case Sensitivity::Case:
	return "case"_s;
	case Sensitivity::Variant:
	return "variant"_s;
	}
	ASSERT_NOT_REACHED();
	return ASCIILiteral::null();
	}

	ASCIILiteral IntlCollator::caseFirstString(CaseFirst caseFirst)
	{
	switch (caseFirst) {
	case CaseFirst::False:
	return "false"_s;
	case CaseFirst::Lower:
	return "lower"_s;
	case CaseFirst::Upper:
	return "upper"_s;
	}
	ASSERT_NOT_REACHED();
	return ASCIILiteral::null();
	}

	JSObject* IntlCollator::resolvedOptions(JSGlobalObject* globalObject)
	{
	VM& vm = globalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	// 10.3.5 Intl.Collator.prototype.resolvedOptions() (ECMA-402 2.0)
	// The function returns a new object whose properties and attributes are set as if
	// constructed by an object literal assigning to each of the following properties the
	// value of the corresponding internal slot of this Collator object (see 10.4): locale,
	// usage, sensitivity, ignorePunctuation, collation, as well as those properties shown
	// in Table 1 whose keys are included in the %Collator%[[relevantExtensionKeys]]
	// internal slot of the standard built-in object that is the initial value of
	// Intl.Collator.

	if (!m_initializedCollator) {
	initializeCollator(globalObject, jsUndefined(), jsUndefined());
	scope.assertNoException();
	}

	JSObject* options = constructEmptyObject(globalObject);
	options->putDirect(vm, vm.propertyNames->locale, jsString(vm, m_locale));
	options->putDirect(vm, vm.propertyNames->usage, jsNontrivialString(vm, usageString(m_usage)));
	options->putDirect(vm, vm.propertyNames->sensitivity, jsNontrivialString(vm, sensitivityString(m_sensitivity)));
	options->putDirect(vm, vm.propertyNames->ignorePunctuation, jsBoolean(m_ignorePunctuation));
	options->putDirect(vm, vm.propertyNames->collation, jsString(vm, m_collation));
	options->putDirect(vm, vm.propertyNames->numeric, jsBoolean(m_numeric));
	options->putDirect(vm, vm.propertyNames->caseFirst, jsNontrivialString(vm, caseFirstString(m_caseFirst)));
	return options;
	}

	void IntlCollator::setBoundCompare(VM& vm, JSBoundFunction* format)
	{
	m_boundCompare.set(vm, this, format);
	}

	} // namespace JSC

	#endif // ENABLE(INTL)