Source/JavaScriptCore/runtime/ISO8601.h - WebKit - Git at Google

 /*
  * Copyright (C) 2021 Sony Interactive Entertainment Inc.
  * Copyright (C) 2021 Apple Inc.
  *
  * 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.
  */

 #pragma once

 #include "IntlObject.h"
 #include "TemporalObject.h"
 #include <wtf/Int128.h>

 namespace JSC {
 namespace ISO8601 {

 class Duration {
     WTF_MAKE_FAST_ALLOCATED(Duration);
 public:
     using const_iterator = std::array<double, numberOfTemporalUnits>::const_iterator;

     Duration() = default;
     Duration(double years, double months, double weeks, double days, double hours, double minutes, double seconds, double milliseconds, double microseconds, double nanoseconds)
         : m_data {
             years,
             months,
             weeks,
             days,
             hours,
             minutes,
             seconds,
             milliseconds,
             microseconds,
             nanoseconds,
         }
     { }

 #define JSC_DEFINE_ISO8601_DURATION_FIELD(name, capitalizedName) \
     double name##s() const { return m_data[static_cast<uint8_t>(TemporalUnit::capitalizedName)]; } \
     void set##capitalizedName##s(double value) { m_data[static_cast<uint8_t>(TemporalUnit::capitalizedName)] = !value ? 0 : value; }
     JSC_TEMPORAL_UNITS(JSC_DEFINE_ISO8601_DURATION_FIELD);
 #undef JSC_DEFINE_ISO8601_DURATION_FIELD

     double& operator[](size_t i) { return m_data[i]; }
     const double& operator[](size_t i) const { return m_data[i]; }
     double& operator[](TemporalUnit u) { return m_data[static_cast<uint8_t>(u)]; }
     const double& operator[](TemporalUnit u) const { return m_data[static_cast<uint8_t>(u)]; }
     const_iterator begin() const { return m_data.begin(); }
     const_iterator end() const { return m_data.end(); }
     void clear() { m_data.fill(0); }

     Duration operator-() const
     {
         Duration result(*this);
         for (auto& value : result.m_data) {
             if (value)
                 value = -value;
         }
         return result;
     }

 private:
     std::array<double, numberOfTemporalUnits> m_data { };
 };

 class ExactTime {
     WTF_MAKE_FAST_ALLOCATED(ExactTime);
 public:
     static constexpr Int128 dayRangeSeconds { 86400'00000000 }; // 1e8 days
     static constexpr Int128 nsPerMicrosecond { 1000 };
     static constexpr Int128 nsPerMillisecond { 1'000'000 };
     static constexpr Int128 nsPerSecond { 1'000'000'000 };
     static constexpr Int128 nsPerMinute = nsPerSecond * 60;
     static constexpr Int128 nsPerHour = nsPerMinute * 60;
     static constexpr Int128 nsPerDay = nsPerHour * 24;
     static constexpr Int128 minValue = -dayRangeSeconds * nsPerSecond;
     static constexpr Int128 maxValue = dayRangeSeconds * nsPerSecond;

     constexpr ExactTime() = default;
     constexpr ExactTime(const ExactTime&) = default;
     constexpr explicit ExactTime(Int128 epochNanoseconds) : m_epochNanoseconds(epochNanoseconds) { }

     static constexpr ExactTime fromEpochSeconds(int64_t epochSeconds)
     {
         return ExactTime(Int128 { epochSeconds } * ExactTime::nsPerSecond);
     }
     static constexpr ExactTime fromEpochMilliseconds(int64_t epochMilliseconds)
     {
         return ExactTime(Int128 { epochMilliseconds } * ExactTime::nsPerMillisecond);
     }
     static constexpr ExactTime fromEpochMicroseconds(int64_t epochMicroseconds)
     {
         return ExactTime(Int128 { epochMicroseconds } * ExactTime::nsPerMicrosecond);
     }
     static ExactTime fromISOPartsAndOffset(int32_t y, uint8_t mon, uint8_t d, unsigned h, unsigned min, unsigned s, unsigned ms, unsigned micros, unsigned ns, int64_t offset);

     int64_t epochSeconds() const
     {
         return static_cast<int64_t>(m_epochNanoseconds / ExactTime::nsPerSecond);
     }
     int64_t epochMilliseconds() const
     {
         return static_cast<int64_t>(m_epochNanoseconds / ExactTime::nsPerMillisecond);
     }
     int64_t epochMicroseconds() const
     {
         return static_cast<int64_t>(m_epochNanoseconds / ExactTime::nsPerMicrosecond);
     }
     constexpr Int128 epochNanoseconds() const
     {
         return m_epochNanoseconds;
     }

     int nanosecondsFraction() const
     {
         return static_cast<int>(m_epochNanoseconds % ExactTime::nsPerSecond);
     }

     String asString() const
     {
         StringBuilder builder;
         if (m_epochNanoseconds < 0) {
             builder.append('-');
             asStringImpl(builder, -m_epochNanoseconds);
         } else
             asStringImpl(builder, m_epochNanoseconds);
         return builder.toString();
     }

     // IsValidEpochNanoseconds ( epochNanoseconds )
     // https://tc39.es/proposal-temporal/#sec-temporal-isvalidepochnanoseconds
     constexpr bool isValid() const
     {
         return m_epochNanoseconds >= ExactTime::minValue && m_epochNanoseconds <= ExactTime::maxValue;
     }

     constexpr bool operator<(ExactTime other) const
     {
         return m_epochNanoseconds < other.m_epochNanoseconds;
     }
     constexpr bool operator<=(ExactTime other) const
     {
         return m_epochNanoseconds <= other.m_epochNanoseconds;
     }
     constexpr bool operator==(ExactTime other) const
     {
         return m_epochNanoseconds == other.m_epochNanoseconds;
     }
     constexpr bool operator!=(ExactTime other) const
     {
         return m_epochNanoseconds != other.m_epochNanoseconds;
     }
     constexpr bool operator>=(ExactTime other) const
     {
         return m_epochNanoseconds >= other.m_epochNanoseconds;
     }
     constexpr bool operator>(ExactTime other) const
     {
         return m_epochNanoseconds > other.m_epochNanoseconds;
     }

     std::optional<ExactTime> add(Duration) const;
     Int128 difference(ExactTime other, unsigned increment, TemporalUnit, RoundingMode) const;
     ExactTime round(unsigned increment, TemporalUnit, RoundingMode) const;

     static ExactTime now();

 private:
     static void asStringImpl(StringBuilder& builder, Int128 value)
     {
         if (value > 9)
             asStringImpl(builder, value / 10);
         builder.append(static_cast<uint64_t>(value % 10) + '0');
     }

     static Int128 round(Int128 quantity, unsigned increment, TemporalUnit, RoundingMode);

     Int128 m_epochNanoseconds { };
 };

 class PlainTime {
     WTF_MAKE_FAST_ALLOCATED(PlainTime);
 public:
     constexpr PlainTime()
         : m_millisecond(0)
         , m_microsecond(0)
         , m_nanosecond(0)
     {
     }

     constexpr PlainTime(unsigned hour, unsigned minute, unsigned second, unsigned millisecond, unsigned microsecond, unsigned nanosecond)
         : m_hour(hour)
         , m_minute(minute)
         , m_second(second)
         , m_millisecond(millisecond)
         , m_microsecond(microsecond)
         , m_nanosecond(nanosecond)
     { }

 #define JSC_DEFINE_ISO8601_PLAIN_TIME_FIELD(name, capitalizedName) \
     unsigned name() const { return m_##name; }
     JSC_TEMPORAL_PLAIN_TIME_UNITS(JSC_DEFINE_ISO8601_PLAIN_TIME_FIELD);
 #undef JSC_DEFINE_ISO8601_DURATION_FIELD

     friend bool operator==(PlainTime lhs, PlainTime rhs)
     {
         return lhs.hour() == rhs.hour()
             && lhs.minute() == rhs.minute()
             && lhs.second() == rhs.second()
             && lhs.millisecond() == rhs.millisecond()
             && lhs.microsecond() == rhs.microsecond()
             && lhs.nanosecond() == rhs.nanosecond();
     }

 private:
     uint8_t m_hour { 0 };
     uint8_t m_minute { 0 };
     uint8_t m_second { 0 };
     uint32_t m_millisecond : 10;
     uint32_t m_microsecond : 10;
     uint32_t m_nanosecond : 10;
 };
 static_assert(sizeof(PlainTime) <= sizeof(uint64_t));

 // Note that PlainDate does not include week unit.
 // year can be negative. And month and day starts with 1.
 class PlainDate {
     WTF_MAKE_FAST_ALLOCATED(PlainDate);
 public:
     constexpr PlainDate()
         : m_year(0)
         , m_month(1)
         , m_day(1)
     {
     }

     constexpr PlainDate(int32_t year, unsigned month, unsigned day)
         : m_year(year)
         , m_month(month)
         , m_day(day)
     {
     }

     int32_t year() const { return m_year; }
     uint8_t month() const { return m_month; }
     uint8_t day() const { return m_day; }

 private:
     int32_t m_year : 21; // ECMAScript max / min date's year can be represented <= 20 bits.
     int32_t m_month : 5; // Starts with 1.
     int32_t m_day : 6; // Starts with 1.
 };
 #if COMPILER(GCC_COMPATIBLE)
 static_assert(sizeof(PlainDate) == sizeof(int32_t));
 #endif

 using TimeZone = std::variant<TimeZoneID, int64_t>;

 // https://tc39.es/proposal-temporal/#sec-temporal-parsetemporaltimezonestring
 // Record { [[Z]], [[OffsetString]], [[Name]] }
 struct TimeZoneRecord {
     bool m_z { false };
     std::optional<int64_t> m_offset;
     std::variant<Vector<LChar>, int64_t> m_nameOrOffset;
 };

 static constexpr unsigned minCalendarLength = 3;
 static constexpr unsigned maxCalendarLength = 8;
 struct CalendarRecord {
     Vector<LChar, maxCalendarLength> m_name;
 };

 // https://tc39.es/proposal-temporal/#sup-isvalidtimezonename
 std::optional<TimeZoneID> parseTimeZoneName(StringView);
 std::optional<Duration> parseDuration(StringView);
 std::optional<int64_t> parseTimeZoneNumericUTCOffset(StringView);
 enum class ValidateTimeZoneID { Yes, No };
 std::optional<std::tuple<PlainTime, std::optional<TimeZoneRecord>>> parseTime(StringView);
 std::optional<std::tuple<PlainTime, std::optional<TimeZoneRecord>, std::optional<CalendarRecord>>> parseCalendarTime(StringView);
 std::optional<std::tuple<PlainDate, std::optional<PlainTime>, std::optional<TimeZoneRecord>>> parseDateTime(StringView);
 std::optional<std::tuple<PlainDate, std::optional<PlainTime>, std::optional<TimeZoneRecord>, std::optional<CalendarRecord>>> parseCalendarDateTime(StringView);
 uint8_t dayOfWeek(PlainDate);
 uint16_t dayOfYear(PlainDate);
 uint8_t weeksInYear(int32_t year);
 uint8_t weekOfYear(PlainDate);
 uint8_t daysInMonth(int32_t year, uint8_t month);
 uint8_t daysInMonth(uint8_t month);
 String formatTimeZoneOffsetString(int64_t);
 String temporalTimeToString(PlainTime, std::tuple<Precision, unsigned> precision);
 String temporalDateToString(PlainDate);
 String monthCode(uint32_t);

 bool isValidDuration(const Duration&);

 std::optional<ExactTime> parseInstant(StringView);

 bool isDateTimeWithinLimits(int32_t year, uint8_t month, uint8_t day, unsigned hour, unsigned minute, unsigned second, unsigned millisecond, unsigned microsecond, unsigned nanosecond);

 } // namespace ISO8601
 } // namespace JSC
	/*
	* Copyright (C) 2021 Sony Interactive Entertainment Inc.
	* Copyright (C) 2021 Apple Inc.
	*
	* 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.
	*/

	#pragma once

	#include "IntlObject.h"
	#include "TemporalObject.h"
	#include <wtf/Int128.h>

	namespace JSC {
	namespace ISO8601 {

	class Duration {
	WTF_MAKE_FAST_ALLOCATED(Duration);
	public:
	using const_iterator = std::array<double, numberOfTemporalUnits>::const_iterator;

	Duration() = default;
	Duration(double years, double months, double weeks, double days, double hours, double minutes, double seconds, double milliseconds, double microseconds, double nanoseconds)
	: m_data {
	years,
	months,
	weeks,
	days,
	hours,
	minutes,
	seconds,
	milliseconds,
	microseconds,
	nanoseconds,
	}
	{ }

	#define JSC_DEFINE_ISO8601_DURATION_FIELD(name, capitalizedName) \
	double name##s() const { return m_data[static_cast<uint8_t>(TemporalUnit::capitalizedName)]; } \
	void set##capitalizedName##s(double value) { m_data[static_cast<uint8_t>(TemporalUnit::capitalizedName)] = !value ? 0 : value; }
	JSC_TEMPORAL_UNITS(JSC_DEFINE_ISO8601_DURATION_FIELD);
	#undef JSC_DEFINE_ISO8601_DURATION_FIELD

	double& operator[](size_t i) { return m_data[i]; }
	const double& operator[](size_t i) const { return m_data[i]; }
	double& operator[](TemporalUnit u) { return m_data[static_cast<uint8_t>(u)]; }
	const double& operator[](TemporalUnit u) const { return m_data[static_cast<uint8_t>(u)]; }
	const_iterator begin() const { return m_data.begin(); }
	const_iterator end() const { return m_data.end(); }
	void clear() { m_data.fill(0); }

	Duration operator-() const
	{
	Duration result(*this);
	for (auto& value : result.m_data) {
	if (value)
	value = -value;
	}
	return result;
	}

	private:
	std::array<double, numberOfTemporalUnits> m_data { };
	};

	class ExactTime {
	WTF_MAKE_FAST_ALLOCATED(ExactTime);
	public:
	static constexpr Int128 dayRangeSeconds { 86400'00000000 }; // 1e8 days
	static constexpr Int128 nsPerMicrosecond { 1000 };
	static constexpr Int128 nsPerMillisecond { 1'000'000 };
	static constexpr Int128 nsPerSecond { 1'000'000'000 };
	static constexpr Int128 nsPerMinute = nsPerSecond * 60;
	static constexpr Int128 nsPerHour = nsPerMinute * 60;
	static constexpr Int128 nsPerDay = nsPerHour * 24;
	static constexpr Int128 minValue = -dayRangeSeconds * nsPerSecond;
	static constexpr Int128 maxValue = dayRangeSeconds * nsPerSecond;

	constexpr ExactTime() = default;
	constexpr ExactTime(const ExactTime&) = default;
	constexpr explicit ExactTime(Int128 epochNanoseconds) : m_epochNanoseconds(epochNanoseconds) { }

	static constexpr ExactTime fromEpochSeconds(int64_t epochSeconds)
	{
	return ExactTime(Int128 { epochSeconds } * ExactTime::nsPerSecond);
	}
	static constexpr ExactTime fromEpochMilliseconds(int64_t epochMilliseconds)
	{
	return ExactTime(Int128 { epochMilliseconds } * ExactTime::nsPerMillisecond);
	}
	static constexpr ExactTime fromEpochMicroseconds(int64_t epochMicroseconds)
	{
	return ExactTime(Int128 { epochMicroseconds } * ExactTime::nsPerMicrosecond);
	}
	static ExactTime fromISOPartsAndOffset(int32_t y, uint8_t mon, uint8_t d, unsigned h, unsigned min, unsigned s, unsigned ms, unsigned micros, unsigned ns, int64_t offset);

	int64_t epochSeconds() const
	{
	return static_cast<int64_t>(m_epochNanoseconds / ExactTime::nsPerSecond);
	}
	int64_t epochMilliseconds() const
	{
	return static_cast<int64_t>(m_epochNanoseconds / ExactTime::nsPerMillisecond);
	}
	int64_t epochMicroseconds() const
	{
	return static_cast<int64_t>(m_epochNanoseconds / ExactTime::nsPerMicrosecond);
	}
	constexpr Int128 epochNanoseconds() const
	{
	return m_epochNanoseconds;
	}

	int nanosecondsFraction() const
	{
	return static_cast<int>(m_epochNanoseconds % ExactTime::nsPerSecond);
	}

	String asString() const
	{
	StringBuilder builder;
	if (m_epochNanoseconds < 0) {
	builder.append('-');
	asStringImpl(builder, -m_epochNanoseconds);
	} else
	asStringImpl(builder, m_epochNanoseconds);
	return builder.toString();
	}

	// IsValidEpochNanoseconds ( epochNanoseconds )
	// https://tc39.es/proposal-temporal/#sec-temporal-isvalidepochnanoseconds
	constexpr bool isValid() const
	{
	return m_epochNanoseconds >= ExactTime::minValue && m_epochNanoseconds <= ExactTime::maxValue;
	}

	constexpr bool operator<(ExactTime other) const
	{
	return m_epochNanoseconds < other.m_epochNanoseconds;
	}
	constexpr bool operator<=(ExactTime other) const
	{
	return m_epochNanoseconds <= other.m_epochNanoseconds;
	}
	constexpr bool operator==(ExactTime other) const
	{
	return m_epochNanoseconds == other.m_epochNanoseconds;
	}
	constexpr bool operator!=(ExactTime other) const
	{
	return m_epochNanoseconds != other.m_epochNanoseconds;
	}
	constexpr bool operator>=(ExactTime other) const
	{
	return m_epochNanoseconds >= other.m_epochNanoseconds;
	}
	constexpr bool operator>(ExactTime other) const
	{
	return m_epochNanoseconds > other.m_epochNanoseconds;
	}

	std::optional<ExactTime> add(Duration) const;
	Int128 difference(ExactTime other, unsigned increment, TemporalUnit, RoundingMode) const;
	ExactTime round(unsigned increment, TemporalUnit, RoundingMode) const;

	static ExactTime now();

	private:
	static void asStringImpl(StringBuilder& builder, Int128 value)
	{
	if (value > 9)
	asStringImpl(builder, value / 10);
	builder.append(static_cast<uint64_t>(value % 10) + '0');
	}

	static Int128 round(Int128 quantity, unsigned increment, TemporalUnit, RoundingMode);

	Int128 m_epochNanoseconds { };
	};

	class PlainTime {
	WTF_MAKE_FAST_ALLOCATED(PlainTime);
	public:
	constexpr PlainTime()
	: m_millisecond(0)
	, m_microsecond(0)
	, m_nanosecond(0)
	{
	}

	constexpr PlainTime(unsigned hour, unsigned minute, unsigned second, unsigned millisecond, unsigned microsecond, unsigned nanosecond)
	: m_hour(hour)
	, m_minute(minute)
	, m_second(second)
	, m_millisecond(millisecond)
	, m_microsecond(microsecond)
	, m_nanosecond(nanosecond)
	{ }

	#define JSC_DEFINE_ISO8601_PLAIN_TIME_FIELD(name, capitalizedName) \
	unsigned name() const { return m_##name; }
	JSC_TEMPORAL_PLAIN_TIME_UNITS(JSC_DEFINE_ISO8601_PLAIN_TIME_FIELD);
	#undef JSC_DEFINE_ISO8601_DURATION_FIELD

	friend bool operator==(PlainTime lhs, PlainTime rhs)
	{
	return lhs.hour() == rhs.hour()
	&& lhs.minute() == rhs.minute()
	&& lhs.second() == rhs.second()
	&& lhs.millisecond() == rhs.millisecond()
	&& lhs.microsecond() == rhs.microsecond()
	&& lhs.nanosecond() == rhs.nanosecond();
	}

	private:
	uint8_t m_hour { 0 };
	uint8_t m_minute { 0 };
	uint8_t m_second { 0 };
	uint32_t m_millisecond : 10;
	uint32_t m_microsecond : 10;
	uint32_t m_nanosecond : 10;
	};
	static_assert(sizeof(PlainTime) <= sizeof(uint64_t));

	// Note that PlainDate does not include week unit.
	// year can be negative. And month and day starts with 1.
	class PlainDate {
	WTF_MAKE_FAST_ALLOCATED(PlainDate);
	public:
	constexpr PlainDate()
	: m_year(0)
	, m_month(1)
	, m_day(1)
	{
	}

	constexpr PlainDate(int32_t year, unsigned month, unsigned day)
	: m_year(year)
	, m_month(month)
	, m_day(day)
	{
	}

	int32_t year() const { return m_year; }
	uint8_t month() const { return m_month; }
	uint8_t day() const { return m_day; }

	private:
	int32_t m_year : 21; // ECMAScript max / min date's year can be represented <= 20 bits.
	int32_t m_month : 5; // Starts with 1.
	int32_t m_day : 6; // Starts with 1.
	};
	#if COMPILER(GCC_COMPATIBLE)
	static_assert(sizeof(PlainDate) == sizeof(int32_t));
	#endif

	using TimeZone = std::variant<TimeZoneID, int64_t>;

	// https://tc39.es/proposal-temporal/#sec-temporal-parsetemporaltimezonestring
	// Record { [[Z]], [[OffsetString]], [[Name]] }
	struct TimeZoneRecord {
	bool m_z { false };
	std::optional<int64_t> m_offset;
	std::variant<Vector<LChar>, int64_t> m_nameOrOffset;
	};

	static constexpr unsigned minCalendarLength = 3;
	static constexpr unsigned maxCalendarLength = 8;
	struct CalendarRecord {
	Vector<LChar, maxCalendarLength> m_name;
	};

	// https://tc39.es/proposal-temporal/#sup-isvalidtimezonename
	std::optional<TimeZoneID> parseTimeZoneName(StringView);
	std::optional<Duration> parseDuration(StringView);
	std::optional<int64_t> parseTimeZoneNumericUTCOffset(StringView);
	enum class ValidateTimeZoneID { Yes, No };
	std::optional<std::tuple<PlainTime, std::optional<TimeZoneRecord>>> parseTime(StringView);
	std::optional<std::tuple<PlainTime, std::optional<TimeZoneRecord>, std::optional<CalendarRecord>>> parseCalendarTime(StringView);
	std::optional<std::tuple<PlainDate, std::optional<PlainTime>, std::optional<TimeZoneRecord>>> parseDateTime(StringView);
	std::optional<std::tuple<PlainDate, std::optional<PlainTime>, std::optional<TimeZoneRecord>, std::optional<CalendarRecord>>> parseCalendarDateTime(StringView);
	uint8_t dayOfWeek(PlainDate);
	uint16_t dayOfYear(PlainDate);
	uint8_t weeksInYear(int32_t year);
	uint8_t weekOfYear(PlainDate);
	uint8_t daysInMonth(int32_t year, uint8_t month);
	uint8_t daysInMonth(uint8_t month);
	String formatTimeZoneOffsetString(int64_t);
	String temporalTimeToString(PlainTime, std::tuple<Precision, unsigned> precision);
	String temporalDateToString(PlainDate);
	String monthCode(uint32_t);

	bool isValidDuration(const Duration&);

	std::optional<ExactTime> parseInstant(StringView);

	bool isDateTimeWithinLimits(int32_t year, uint8_t month, uint8_t day, unsigned hour, unsigned minute, unsigned second, unsigned millisecond, unsigned microsecond, unsigned nanosecond);

	} // namespace ISO8601
	} // namespace JSC