blob: 210c59aee91a7f798e7fa028ecbcc02aa9656356 [file] [log] [blame]
/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2006-2018 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
* version of this file only under the terms of one of those two
* licenses (the MPL or the GPL) and not to allow others to use your
* 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 "JSObject.h"
#include "JSScope.h"
#include "JSCInlines.h"
#include <algorithm>
#include <limits.h>
#include <limits>
#include <stdint.h>
#include <time.h>
#include <wtf/ASCIICType.h>
#include <wtf/Assertions.h>
#include <wtf/MathExtras.h>
#include <wtf/StdLibExtras.h>
#if HAVE(ERRNO_H)
#include <errno.h>
#endif
#if HAVE(SYS_TIME_H)
#include <sys/time.h>
#endif
#if HAVE(SYS_TIMEB_H)
#include <sys/timeb.h>
#endif
namespace JSC {
// 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 NaN.
static LocalTimeOffset localTimeOffset(VM& vm, double ms, WTF::TimeType inputTimeType = WTF::UTCTime)
{
LocalTimeOffsetCache& cache = inputTimeType == WTF::LocalTime
? vm.localTimeOffsetCache : vm.utcTimeOffsetCache;
double start = cache.start;
double end = cache.end;
if (start <= ms) {
// If the time fits in the cached interval, return the cached offset.
if (ms <= end)
return cache.offset;
// Compute a possible new interval end.
double newEnd = end + cache.increment;
if (ms <= newEnd) {
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.increment = WTF::msPerMonth;
return endOffset;
}
LocalTimeOffset offset = calculateLocalTimeOffset(ms, 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. Updated
// the interval to reflect this and reset the increment.
cache.start = ms;
cache.end = newEnd;
cache.increment = 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.increment /= 3;
cache.end = ms;
}
// Update the offset in the cache and return it.
cache.offset = offset;
return offset;
}
}
// 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(ms, inputTimeType);
cache.offset = offset;
cache.start = ms;
cache.end = ms;
cache.increment = WTF::msPerMonth;
return offset;
}
static inline double timeToMS(double hour, double min, double sec, double ms)
{
return (((hour * WTF::minutesPerHour + min) * WTF::secondsPerMinute + sec) * WTF::msPerSecond + ms);
}
double gregorianDateTimeToMS(VM& vm, 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(vm, localTimeResult, inputTimeType).offset : 0;
return localTimeResult - localToUTCTimeOffset;
}
// input is UTC
void msToGregorianDateTime(VM& vm, double ms, WTF::TimeType outputTimeType, GregorianDateTime& tm)
{
LocalTimeOffset localTime;
if (outputTimeType == WTF::LocalTime) {
localTime = localTimeOffset(vm, ms);
ms += localTime.offset;
}
tm = GregorianDateTime(ms, localTime);
}
static double parseDate(VM& vm, const char* dateString)
{
bool isLocalTime;
double value = WTF::parseES5DateFromNullTerminatedCharacters(dateString, isLocalTime);
if (std::isnan(value))
value = WTF::parseDateFromNullTerminatedCharacters(dateString, isLocalTime);
if (isLocalTime)
value -= localTimeOffset(vm, value, WTF::LocalTime).offset;
return value;
}
double parseDate(JSGlobalObject* globalObject, VM& vm, const String& date)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (date == vm.cachedDateString)
return vm.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 dateUtf8 = expectedString.value();
double value = parseDate(vm, dateUtf8.data());
vm.cachedDateString = date;
vm.cachedDateStringValue = value;
return value;
}
} // namespace JSC