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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2006-2021 Apple Inc. All rights reserved.
* Copyright (C) 2009 Google Inc. All rights reserved.
* Copyright (C) 2007-2009 Torch Mobile, Inc.
* Copyright (C) 2010 &yet, LLC. (nate@andyet.net)
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Alternatively, the contents of this file may be used under the terms
* of either the Mozilla Public License Version 1.1, found at
* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
* (the "GPL"), in which case the provisions of the MPL or the GPL are
* applicable instead of those above. If you wish to allow use of your
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* version of this file under the LGPL, indicate your decision by
* deletingthe provisions above and replace them with the notice and
* other provisions required by the MPL or the GPL, as the case may be.
* If you do not delete the provisions above, a recipient may use your
* version of this file under any of the LGPL, the MPL or the GPL.
* Copyright 2006-2008 the V8 project authors. All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "JSDateMath.h"
#include "ExceptionHelpers.h"
#include "VM.h"
#include <limits>
#include <wtf/unicode/icu/ICUHelpers.h>
#if U_ICU_VERSION_MAJOR_NUM >= 69 || (U_ICU_VERSION_MAJOR_NUM == 68 && USE(APPLE_INTERNAL_SDK))
#define HAVE_ICU_C_TIMEZONE_API 1
#ifdef U_HIDE_DRAFT_API
#undef U_HIDE_DRAFT_API
#endif
#include <unicode/ucal.h>
#else
// icu::TimeZone and icu::BasicTimeZone features are only available in ICU C++ APIs.
// We use these C++ APIs as an exception.
#undef U_SHOW_CPLUSPLUS_API
#define U_SHOW_CPLUSPLUS_API 1
#include <unicode/basictz.h>
#include <unicode/timezone.h>
#include <unicode/unistr.h>
#undef U_SHOW_CPLUSPLUS_API
#define U_SHOW_CPLUSPLUS_API 0
#endif
namespace JSC {
#if HAVE(ICU_C_TIMEZONE_API)
class OpaqueICUTimeZone {
WTF_MAKE_FAST_ALLOCATED(OpaqueICUTimeZone);
public:
std::unique_ptr<UCalendar, ICUDeleter<ucal_close>> m_calendar;
String m_canonicalTimeZoneID;
};
#endif
void OpaqueICUTimeZoneDeleter::operator()(OpaqueICUTimeZone* timeZone)
{
if (timeZone) {
#if HAVE(ICU_C_TIMEZONE_API)
delete timeZone;
#else
delete bitwise_cast<icu::TimeZone*>(timeZone);
#endif
}
}
// Get the combined UTC + DST offset for the time passed in.
//
// NOTE: The implementation relies on the fact that no time zones have
// more than one daylight savings offset change per month.
// If this function is called with NaN it returns random value.
LocalTimeOffset DateCache::calculateLocalTimeOffset(double millisecondsFromEpoch, WTF::TimeType inputTimeType)
{
int32_t rawOffset = 0;
int32_t dstOffset = 0;
UErrorCode status = U_ZERO_ERROR;
// This function can fail input date is invalid: NaN etc.
// We can return any values in this case since later we fail when computing non timezone offset part anyway.
constexpr LocalTimeOffset failed { false, 0 };
#if HAVE(ICU_C_TIMEZONE_API)
auto& timeZoneCache = *this->timeZoneCache();
ucal_setMillis(timeZoneCache.m_calendar.get(), millisecondsFromEpoch, &status);
if (U_FAILURE(status))
return failed;
if (inputTimeType != WTF::LocalTime) {
rawOffset = ucal_get(timeZoneCache.m_calendar.get(), UCAL_ZONE_OFFSET, &status);
if (U_FAILURE(status))
return failed;
dstOffset = ucal_get(timeZoneCache.m_calendar.get(), UCAL_DST_OFFSET, &status);
if (U_FAILURE(status))
return failed;
} else {
ucal_getTimeZoneOffsetFromLocal(timeZoneCache.m_calendar.get(), UCAL_TZ_LOCAL_FORMER, UCAL_TZ_LOCAL_FORMER, &rawOffset, &dstOffset, &status);
if (U_FAILURE(status))
return failed;
}
#else
auto& timeZoneCache = *bitwise_cast<icu::TimeZone*>(this->timeZoneCache());
if (inputTimeType != WTF::LocalTime) {
constexpr bool isLocalTime = false;
timeZoneCache.getOffset(millisecondsFromEpoch, isLocalTime, rawOffset, dstOffset, status);
if (U_FAILURE(status))
return failed;
} else {
// icu::TimeZone is a timezone instance which inherits icu::BasicTimeZone.
// https://unicode-org.atlassian.net/browse/ICU-13705 will move getOffsetFromLocal to icu::TimeZone.
static_cast<const icu::BasicTimeZone&>(timeZoneCache).getOffsetFromLocal(millisecondsFromEpoch, icu::BasicTimeZone::kFormer, icu::BasicTimeZone::kFormer, rawOffset, dstOffset, status);
if (U_FAILURE(status))
return failed;
}
#endif
return { !!dstOffset, rawOffset + dstOffset };
}
LocalTimeOffset DateCache::localTimeOffset(double millisecondsFromEpoch, WTF::TimeType inputTimeType)
{
LocalTimeOffsetCache& cache = inputTimeType == WTF::LocalTime ? m_localTimeOffsetCache : m_utcTimeOffsetCache;
double start = cache.start;
double end = cache.end;
auto resetCache = [&]() {
// Compute the DST offset for the time and shrink the cache interval
// to only contain the time. This allows fast repeated DST offset
// computations for the same time.
LocalTimeOffset offset = calculateLocalTimeOffset(millisecondsFromEpoch, inputTimeType);
cache.offset = offset;
cache.start = millisecondsFromEpoch;
cache.end = millisecondsFromEpoch;
cache.incrementStart = WTF::msPerMonth;
cache.incrementEnd = WTF::msPerMonth;
return offset;
};
// If the time fits in the cached interval, return the cached offset.
if (start <= millisecondsFromEpoch && millisecondsFromEpoch <= end)
return cache.offset;
if (start <= millisecondsFromEpoch) {
// Compute a possible new interval end.
double newEnd = end + cache.incrementEnd;
if (!(millisecondsFromEpoch <= newEnd))
return resetCache();
LocalTimeOffset endOffset = calculateLocalTimeOffset(newEnd, inputTimeType);
if (cache.offset == endOffset) {
// If the offset at the end of the new interval still matches
// the offset in the cache, we grow the cached time interval
// and return the offset.
cache.end = newEnd;
cache.incrementStart = WTF::msPerMonth;
cache.incrementEnd = WTF::msPerMonth;
return endOffset;
}
LocalTimeOffset offset = calculateLocalTimeOffset(millisecondsFromEpoch, inputTimeType);
if (offset == endOffset) {
// The offset at the given time is equal to the offset at the
// new end of the interval, so that means that we've just skipped
// the point in time where the DST offset change occurred. Update
// the interval to reflect this and reset the increment.
cache.start = millisecondsFromEpoch;
cache.end = newEnd;
cache.incrementStart = WTF::msPerMonth;
cache.incrementEnd = WTF::msPerMonth;
} else {
// The interval contains a DST offset change and the given time is
// before it. Adjust the increment to avoid a linear search for
// the offset change point and change the end of the interval.
cache.incrementEnd /= 3;
cache.end = millisecondsFromEpoch;
}
// Update the offset in the cache and return it.
cache.offset = offset;
return offset;
}
// Compute a possible new interval start.
double newStart = start - cache.incrementStart;
if (!(newStart <= millisecondsFromEpoch))
return resetCache();
LocalTimeOffset startOffset = calculateLocalTimeOffset(newStart, inputTimeType);
if (cache.offset == startOffset) {
// If the offset at the start of the new interval still matches
// the offset in the cache, we grow the cached time interval
// and return the offset.
cache.start = newStart;
cache.incrementStart = WTF::msPerMonth;
cache.incrementEnd = WTF::msPerMonth;
return startOffset;
}
LocalTimeOffset offset = calculateLocalTimeOffset(millisecondsFromEpoch, inputTimeType);
if (offset == startOffset) {
// The offset at the given time is equal to the offset at the
// new start of the interval, so that means that we've just skipped
// the point in time where the DST offset change occurred. Update
// the interval to reflect this and reset the increment.
cache.start = newStart;
cache.end = millisecondsFromEpoch;
cache.incrementStart = WTF::msPerMonth;
cache.incrementEnd = WTF::msPerMonth;
} else {
// The interval contains a DST offset change and the given time is
// before it. Adjust the increment to avoid a linear search for
// the offset change point and change the end of the interval.
cache.incrementStart /= 3;
cache.start = millisecondsFromEpoch;
}
// Update the offset in the cache and return it.
cache.offset = offset;
return offset;
}
double DateCache::gregorianDateTimeToMS(const GregorianDateTime& t, double milliseconds, WTF::TimeType inputTimeType)
{
double day = dateToDaysFrom1970(t.year(), t.month(), t.monthDay());
double ms = timeToMS(t.hour(), t.minute(), t.second(), milliseconds);
double localTimeResult = (day * WTF::msPerDay) + ms;
double localToUTCTimeOffset = inputTimeType == WTF::LocalTime ? localTimeOffset(localTimeResult, inputTimeType).offset : 0;
return localTimeResult - localToUTCTimeOffset;
}
// input is UTC
void DateCache::msToGregorianDateTime(double millisecondsFromEpoch, WTF::TimeType outputTimeType, GregorianDateTime& tm)
{
LocalTimeOffset localTime;
if (outputTimeType == WTF::LocalTime) {
localTime = localTimeOffset(millisecondsFromEpoch);
millisecondsFromEpoch += localTime.offset;
}
tm = GregorianDateTime(millisecondsFromEpoch, localTime);
}
double DateCache::parseDate(JSGlobalObject* globalObject, VM& vm, const String& date)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (date == m_cachedDateString)
return m_cachedDateStringValue;
auto expectedString = date.tryGetUtf8();
if (!expectedString) {
if (expectedString.error() == UTF8ConversionError::OutOfMemory)
throwOutOfMemoryError(globalObject, scope);
// https://tc39.github.io/ecma262/#sec-date-objects section 20.3.3.2 states that:
// "Unrecognizable Strings or dates containing illegal element values in the
// format String shall cause Date.parse to return NaN."
return std::numeric_limits<double>::quiet_NaN();
}
auto parseDateImpl = [this] (const char* dateString) {
bool isLocalTime;
double value = WTF::parseES5DateFromNullTerminatedCharacters(dateString, isLocalTime);
if (std::isnan(value))
value = WTF::parseDateFromNullTerminatedCharacters(dateString, isLocalTime);
if (isLocalTime)
value -= localTimeOffset(value, WTF::LocalTime).offset;
return value;
};
auto dateUtf8 = expectedString.value();
double value = parseDateImpl(dateUtf8.data());
m_cachedDateString = date;
m_cachedDateStringValue = value;
return value;
}
// https://tc39.es/ecma402/#sec-defaulttimezone
String DateCache::defaultTimeZone()
{
#if HAVE(ICU_C_TIMEZONE_API)
return timeZoneCache()->m_canonicalTimeZoneID;
#else
icu::UnicodeString timeZoneID;
icu::UnicodeString canonicalTimeZoneID;
auto& timeZone = *bitwise_cast<icu::TimeZone*>(timeZoneCache());
timeZone.getID(timeZoneID);
UErrorCode status = U_ZERO_ERROR;
UBool isSystem = false;
icu::TimeZone::getCanonicalID(timeZoneID, canonicalTimeZoneID, isSystem, status);
if (U_FAILURE(status))
return "UTC"_s;
String canonical = String(canonicalTimeZoneID.getBuffer(), canonicalTimeZoneID.length());
if (isUTCEquivalent(canonical))
return "UTC"_s;
return canonical;
#endif
}
// To confine icu::TimeZone destructor invocation in this file.
DateCache::DateCache() = default;
DateCache::~DateCache() = default;
Ref<DateInstanceData> DateCache::cachedDateInstanceData(double millisecondsFromEpoch)
{
return *m_dateInstanceCache.add(millisecondsFromEpoch);
}
void DateCache::timeZoneCacheSlow()
{
ASSERT(!m_timeZoneCache);
#if HAVE(ICU_C_TIMEZONE_API)
auto* cache = new OpaqueICUTimeZone;
String canonical;
Vector<UChar, 32> timeZoneID;
auto status = callBufferProducingFunction(ucal_getHostTimeZone, timeZoneID);
if (U_SUCCESS(status)) {
Vector<UChar, 32> canonicalBuffer;
auto status = callBufferProducingFunction(ucal_getCanonicalTimeZoneID, timeZoneID.data(), timeZoneID.size(), canonicalBuffer, nullptr);
if (U_SUCCESS(status))
canonical = String(canonicalBuffer);
}
if (canonical.isNull() || isUTCEquivalent(canonical))
canonical = "UTC"_s;
cache->m_canonicalTimeZoneID = WTFMove(canonical);
status = U_ZERO_ERROR;
cache->m_calendar = std::unique_ptr<UCalendar, ICUDeleter<ucal_close>>(ucal_open(timeZoneID.data(), timeZoneID.size(), "", UCAL_DEFAULT, &status));
ASSERT_UNUSED(status, U_SUCCESS(status));
ucal_setGregorianChange(cache->m_calendar.get(), minECMAScriptTime, &status); // Ignore "unsupported" error.
m_timeZoneCache = std::unique_ptr<OpaqueICUTimeZone, OpaqueICUTimeZoneDeleter>(cache);
#else
// Do not use icu::TimeZone::createDefault. ICU internally has a cache for timezone and createDefault returns this cached value.
m_timeZoneCache = std::unique_ptr<OpaqueICUTimeZone, OpaqueICUTimeZoneDeleter>(bitwise_cast<OpaqueICUTimeZone*>(icu::TimeZone::detectHostTimeZone()));
#endif
}
void DateCache::reset()
{
m_timeZoneCache.reset();
m_utcTimeOffsetCache = LocalTimeOffsetCache();
m_localTimeOffsetCache = LocalTimeOffsetCache();
m_cachedDateString = String();
m_cachedDateStringValue = std::numeric_limits<double>::quiet_NaN();
m_dateInstanceCache.reset();
}
} // namespace JSC