1020 lines
37 KiB
C++
1020 lines
37 KiB
C++
/*
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* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
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* Copyright (C) 2006-2019 Apple Inc. All rights reserved.
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* Copyright (C) 2009 Google Inc. All rights reserved.
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* Copyright (C) 2007-2009 Torch Mobile, Inc.
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* Copyright (C) 2010 &yet, LLC. (nate@andyet.net)
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Alternatively, the contents of this file may be used under the terms
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* of either the Mozilla Public License Version 1.1, found at
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* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
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* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
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* (the "GPL"), in which case the provisions of the MPL or the GPL are
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* applicable instead of those above. If you wish to allow use of your
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* version of this file only under the terms of one of those two
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* licenses (the MPL or the GPL) and not to allow others to use your
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* version of this file under the LGPL, indicate your decision by
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* deletingthe provisions above and replace them with the notice and
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* other provisions required by the MPL or the GPL, as the case may be.
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* If you do not delete the provisions above, a recipient may use your
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* version of this file under any of the LGPL, the MPL or the GPL.
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* Copyright 2006-2008 the V8 project authors. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <wtf/DateMath.h>
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#include <algorithm>
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#include <limits>
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#include <stdint.h>
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#include <time.h>
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#include <wtf/Assertions.h>
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#include <wtf/ASCIICType.h>
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#include <wtf/text/StringBuilder.h>
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#if OS(WINDOWS)
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#include <windows.h>
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#endif
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namespace WTF {
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// FIXME: Should this function go into StringCommon.h or some other header?
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template<unsigned length> inline bool startsWithLettersIgnoringASCIICase(const char* string, const char (&lowercaseLetters)[length])
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{
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return equalLettersIgnoringASCIICase(string, lowercaseLetters, length - 1);
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}
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/* Constants */
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const char* const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
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const char* const monthName[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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const char* const monthFullName[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
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// Day of year for the first day of each month, where index 0 is January, and day 0 is January 1.
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// First for non-leap years, then for leap years.
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const int firstDayOfMonth[2][12] = {
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{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
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{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335}
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};
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#if !OS(WINDOWS) || HAVE(TM_GMTOFF)
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static inline void getLocalTime(const time_t* localTime, struct tm* localTM)
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{
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#if HAVE(LOCALTIME_R)
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localtime_r(localTime, localTM);
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#else
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localtime_s(localTime, localTM);
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#endif
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}
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#endif
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static void appendTwoDigitNumber(StringBuilder& builder, int number)
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{
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ASSERT(number >= 0);
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ASSERT(number < 100);
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builder.append(static_cast<LChar>('0' + number / 10));
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builder.append(static_cast<LChar>('0' + number % 10));
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}
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static inline double msToMilliseconds(double ms)
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{
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double result = fmod(ms, msPerDay);
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if (result < 0)
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result += msPerDay;
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return result;
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}
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// There is a hard limit at 2038 that we currently do not have a workaround
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// for (rdar://problem/5052975).
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static inline int maximumYearForDST()
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{
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return 2037;
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}
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static inline int minimumYearForDST()
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{
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// Because of the 2038 issue (see maximumYearForDST) if the current year is
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// greater than the max year minus 27 (2010), we want to use the max year
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// minus 27 instead, to ensure there is a range of 28 years that all years
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// can map to.
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return std::min(msToYear(jsCurrentTime()), maximumYearForDST() - 27) ;
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}
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/*
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* Find an equivalent year for the one given, where equivalence is deterined by
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* the two years having the same leapness and the first day of the year, falling
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* on the same day of the week.
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*
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* This function returns a year between this current year and 2037, however this
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* function will potentially return incorrect results if the current year is after
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* 2010, (rdar://problem/5052975), if the year passed in is before 1900 or after
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* 2100, (rdar://problem/5055038).
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*/
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int equivalentYearForDST(int year)
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{
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// It is ok if the cached year is not the current year as long as the rules
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// for DST did not change between the two years; if they did the app would need
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// to be restarted.
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static int minYear = minimumYearForDST();
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int maxYear = maximumYearForDST();
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int difference;
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if (year > maxYear)
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difference = minYear - year;
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else if (year < minYear)
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difference = maxYear - year;
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else
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return year;
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int quotient = difference / 28;
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int product = (quotient) * 28;
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year += product;
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return year;
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}
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#if OS(WINDOWS)
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typedef BOOL(WINAPI* callGetTimeZoneInformationForYear_t)(USHORT, PDYNAMIC_TIME_ZONE_INFORMATION, LPTIME_ZONE_INFORMATION);
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static callGetTimeZoneInformationForYear_t timeZoneInformationForYearFunction()
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{
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static callGetTimeZoneInformationForYear_t getTimeZoneInformationForYear = nullptr;
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if (getTimeZoneInformationForYear)
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return getTimeZoneInformationForYear;
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HMODULE module = ::GetModuleHandleW(L"kernel32.dll");
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if (!module)
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return nullptr;
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getTimeZoneInformationForYear = reinterpret_cast<callGetTimeZoneInformationForYear_t>(::GetProcAddress(module, "GetTimeZoneInformationForYear"));
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return getTimeZoneInformationForYear;
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}
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#endif
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static int32_t calculateUTCOffset()
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{
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#if OS(WINDOWS)
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TIME_ZONE_INFORMATION timeZoneInformation;
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DWORD rc = 0;
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if (callGetTimeZoneInformationForYear_t timeZoneFunction = timeZoneInformationForYearFunction()) {
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// If available, use the Windows API call that takes into account the varying DST from
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// year to year.
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SYSTEMTIME systemTime;
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::GetSystemTime(&systemTime);
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rc = timeZoneFunction(systemTime.wYear, nullptr, &timeZoneInformation);
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if (rc == TIME_ZONE_ID_INVALID)
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return 0;
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} else {
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rc = ::GetTimeZoneInformation(&timeZoneInformation);
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if (rc == TIME_ZONE_ID_INVALID)
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return 0;
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}
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int32_t bias = timeZoneInformation.Bias;
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if (rc == TIME_ZONE_ID_DAYLIGHT)
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bias += timeZoneInformation.DaylightBias;
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else if (rc == TIME_ZONE_ID_STANDARD || rc == TIME_ZONE_ID_UNKNOWN)
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bias += timeZoneInformation.StandardBias;
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return -bias * 60 * 1000;
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#else
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time_t localTime = time(0);
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tm localt;
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getLocalTime(&localTime, &localt);
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// Get the difference between this time zone and UTC on the 1st of January of this year.
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localt.tm_sec = 0;
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localt.tm_min = 0;
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localt.tm_hour = 0;
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localt.tm_mday = 1;
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localt.tm_mon = 0;
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// Not setting localt.tm_year!
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localt.tm_wday = 0;
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localt.tm_yday = 0;
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localt.tm_isdst = 0;
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#if HAVE(TM_GMTOFF)
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localt.tm_gmtoff = 0;
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#endif
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#if HAVE(TM_ZONE)
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localt.tm_zone = 0;
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#endif
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#if HAVE(TIMEGM)
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time_t utcOffset = timegm(&localt) - mktime(&localt);
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#else
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// Using a canned date of 01/01/2019 on platforms with weaker date-handling foo.
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localt.tm_year = 119;
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time_t utcOffset = 1546300800 - mktime(&localt);
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#endif
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return static_cast<int32_t>(utcOffset * 1000);
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#endif
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}
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#if !HAVE(TM_GMTOFF)
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#if OS(WINDOWS)
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// Code taken from http://support.microsoft.com/kb/167296
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static void UnixTimeToFileTime(time_t t, LPFILETIME pft)
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{
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// Note that LONGLONG is a 64-bit value
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LONGLONG ll;
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ll = Int32x32To64(t, 10000000) + 116444736000000000;
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pft->dwLowDateTime = (DWORD)ll;
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pft->dwHighDateTime = ll >> 32;
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}
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#endif
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/*
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* Get the DST offset for the time passed in.
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*/
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static double calculateDSTOffset(time_t localTime, double utcOffset)
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{
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// input is UTC so we have to shift back to local time to determine DST thus the + getUTCOffset()
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double offsetTime = (localTime * msPerSecond) + utcOffset;
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// Offset from UTC but doesn't include DST obviously
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int offsetHour = msToHours(offsetTime);
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int offsetMinute = msToMinutes(offsetTime);
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#if OS(WINDOWS)
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FILETIME utcFileTime;
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UnixTimeToFileTime(localTime, &utcFileTime);
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SYSTEMTIME utcSystemTime, localSystemTime;
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if (!::FileTimeToSystemTime(&utcFileTime, &utcSystemTime))
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return 0;
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if (!::SystemTimeToTzSpecificLocalTime(nullptr, &utcSystemTime, &localSystemTime))
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return 0;
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double diff = ((localSystemTime.wHour - offsetHour) * secondsPerHour) + ((localSystemTime.wMinute - offsetMinute) * 60);
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#else
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tm localTM;
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getLocalTime(&localTime, &localTM);
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double diff = ((localTM.tm_hour - offsetHour) * secondsPerHour) + ((localTM.tm_min - offsetMinute) * 60);
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#endif
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if (diff < 0)
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diff += secondsPerDay;
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return (diff * msPerSecond);
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}
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#endif
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// Returns combined offset in millisecond (UTC + DST).
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LocalTimeOffset calculateLocalTimeOffset(double ms, TimeType inputTimeType)
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{
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#if HAVE(TM_GMTOFF)
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double localToUTCTimeOffset = inputTimeType == LocalTime ? calculateUTCOffset() : 0;
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#else
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double localToUTCTimeOffset = calculateUTCOffset();
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#endif
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if (inputTimeType == LocalTime)
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ms -= localToUTCTimeOffset;
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// On Mac OS X, the call to localtime (see calculateDSTOffset) will return historically accurate
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// DST information (e.g. New Zealand did not have DST from 1946 to 1974) however the JavaScript
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// standard explicitly dictates that historical information should not be considered when
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// determining DST. For this reason we shift away from years that localtime can handle but would
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// return historically accurate information.
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int year = msToYear(ms);
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int equivalentYear = equivalentYearForDST(year);
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if (year != equivalentYear) {
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bool leapYear = isLeapYear(year);
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int dayInYearLocal = dayInYear(ms, year);
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int dayInMonth = dayInMonthFromDayInYear(dayInYearLocal, leapYear);
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int month = monthFromDayInYear(dayInYearLocal, leapYear);
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double day = dateToDaysFrom1970(equivalentYear, month, dayInMonth);
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ms = (day * msPerDay) + msToMilliseconds(ms);
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}
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double localTimeSeconds = ms / msPerSecond;
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if (localTimeSeconds > maxUnixTime)
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localTimeSeconds = maxUnixTime;
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else if (localTimeSeconds < 0) // Go ahead a day to make localtime work (does not work with 0).
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localTimeSeconds += secondsPerDay;
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// FIXME: time_t has a potential problem in 2038.
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time_t localTime = static_cast<time_t>(localTimeSeconds);
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#if HAVE(TM_GMTOFF)
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tm localTM;
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getLocalTime(&localTime, &localTM);
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return LocalTimeOffset(localTM.tm_isdst, localTM.tm_gmtoff * msPerSecond);
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#else
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double dstOffset = calculateDSTOffset(localTime, localToUTCTimeOffset);
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return LocalTimeOffset(dstOffset, localToUTCTimeOffset + dstOffset);
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#endif
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}
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void initializeDates()
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{
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#if ASSERT_ENABLED
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static bool alreadyInitialized;
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ASSERT(!alreadyInitialized);
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alreadyInitialized = true;
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#endif
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equivalentYearForDST(2000); // Need to call once to initialize a static used in this function.
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}
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static inline double ymdhmsToMilliseconds(int year, long mon, long day, long hour, long minute, long second, double milliseconds)
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{
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int mday = firstDayOfMonth[isLeapYear(year)][mon - 1];
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double ydays = daysFrom1970ToYear(year);
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double dateMilliseconds = milliseconds + second * msPerSecond + minute * (secondsPerMinute * msPerSecond) + hour * (secondsPerHour * msPerSecond) + (mday + day - 1 + ydays) * (secondsPerDay * msPerSecond);
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// Clamp to EcmaScript standard (ecma262/#sec-time-values-and-time-range) of
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// +/- 100,000,000 days from 01 January, 1970.
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if (dateMilliseconds < -8640000000000000.0 || dateMilliseconds > 8640000000000000.0)
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return std::numeric_limits<double>::quiet_NaN();
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return dateMilliseconds;
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}
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// We follow the recommendation of RFC 2822 to consider all
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// obsolete time zones not listed here equivalent to "-0000".
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static const struct KnownZone {
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#if !OS(WINDOWS)
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const
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#endif
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char tzName[4];
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int tzOffset;
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} knownZones[] = {
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{ "ut", 0 },
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{ "gmt", 0 },
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{ "est", -300 },
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{ "edt", -240 },
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{ "cst", -360 },
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{ "cdt", -300 },
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{ "mst", -420 },
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{ "mdt", -360 },
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{ "pst", -480 },
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{ "pdt", -420 }
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};
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inline static void skipSpacesAndComments(const char*& s)
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{
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int nesting = 0;
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char ch;
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while ((ch = *s)) {
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if (!isASCIISpace(ch)) {
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if (ch == '(')
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nesting++;
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else if (ch == ')' && nesting > 0)
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nesting--;
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else if (nesting == 0)
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break;
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}
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s++;
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}
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}
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// returns 0-11 (Jan-Dec); -1 on failure
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static int findMonth(const char* monthStr)
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{
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ASSERT(monthStr);
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char needle[4];
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for (int i = 0; i < 3; ++i) {
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if (!*monthStr)
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return -1;
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needle[i] = static_cast<char>(toASCIILower(*monthStr++));
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}
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needle[3] = '\0';
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const char *haystack = "janfebmaraprmayjunjulaugsepoctnovdec";
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const char *str = strstr(haystack, needle);
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if (str) {
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int position = static_cast<int>(str - haystack);
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if (position % 3 == 0)
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return position / 3;
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}
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return -1;
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}
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static bool parseInt(const char* string, char** stopPosition, int base, int* result)
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{
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long longResult = strtol(string, stopPosition, base);
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// Avoid the use of errno as it is not available on Windows CE
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if (string == *stopPosition || longResult <= std::numeric_limits<int>::min() || longResult >= std::numeric_limits<int>::max())
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return false;
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*result = static_cast<int>(longResult);
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return true;
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}
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static bool parseLong(const char* string, char** stopPosition, int base, long* result)
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{
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*result = strtol(string, stopPosition, base);
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// Avoid the use of errno as it is not available on Windows CE
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if (string == *stopPosition || *result == std::numeric_limits<long>::min() || *result == std::numeric_limits<long>::max())
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return false;
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return true;
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}
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|
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// Parses a date with the format YYYY[-MM[-DD]].
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|
// Year parsing is lenient, allows any number of digits, and +/-.
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|
// Returns 0 if a parse error occurs, else returns the end of the parsed portion of the string.
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|
static char* parseES5DatePortion(const char* currentPosition, int& year, long& month, long& day)
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{
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char* postParsePosition;
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|
|
// This is a bit more lenient on the year string than ES5 specifies:
|
|
// instead of restricting to 4 digits (or 6 digits with mandatory +/-),
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// it accepts any integer value. Consider this an implementation fallback.
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|
if (!parseInt(currentPosition, &postParsePosition, 10, &year))
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return nullptr;
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|
|
|
// Check for presence of -MM portion.
|
|
if (*postParsePosition != '-')
|
|
return postParsePosition;
|
|
currentPosition = postParsePosition + 1;
|
|
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &month))
|
|
return nullptr;
|
|
if ((postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
|
|
// Check for presence of -DD portion.
|
|
if (*postParsePosition != '-')
|
|
return postParsePosition;
|
|
currentPosition = postParsePosition + 1;
|
|
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &day))
|
|
return nullptr;
|
|
if ((postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
return postParsePosition;
|
|
}
|
|
|
|
// Parses a time with the format HH:mm[:ss[.sss]][Z|(+|-)(00:00|0000|00)].
|
|
// Fractional seconds parsing is lenient, allows any number of digits.
|
|
// Returns 0 if a parse error occurs, else returns the end of the parsed portion of the string.
|
|
static char* parseES5TimePortion(char* currentPosition, long& hours, long& minutes, long& seconds, double& milliseconds, bool& isLocalTime, long& timeZoneSeconds)
|
|
{
|
|
isLocalTime = false;
|
|
|
|
char* postParsePosition;
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &hours))
|
|
return nullptr;
|
|
if (*postParsePosition != ':' || (postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
currentPosition = postParsePosition + 1;
|
|
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &minutes))
|
|
return nullptr;
|
|
if ((postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
currentPosition = postParsePosition;
|
|
|
|
// Seconds are optional.
|
|
if (*currentPosition == ':') {
|
|
++currentPosition;
|
|
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &seconds))
|
|
return nullptr;
|
|
if ((postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
if (*postParsePosition == '.') {
|
|
currentPosition = postParsePosition + 1;
|
|
|
|
// In ECMA-262-5 it's a bit unclear if '.' can be present without milliseconds, but
|
|
// a reasonable interpretation guided by the given examples and RFC 3339 says "no".
|
|
// We check the next character to avoid reading +/- timezone hours after an invalid decimal.
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
|
|
// We are more lenient than ES5 by accepting more or less than 3 fraction digits.
|
|
long fracSeconds;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &fracSeconds))
|
|
return nullptr;
|
|
|
|
long numFracDigits = postParsePosition - currentPosition;
|
|
milliseconds = fracSeconds * pow(10.0, static_cast<double>(-numFracDigits + 3));
|
|
}
|
|
currentPosition = postParsePosition;
|
|
}
|
|
|
|
if (*currentPosition == 'Z')
|
|
return currentPosition + 1;
|
|
|
|
// Parse (+|-)(00:00|0000|00).
|
|
bool tzNegative;
|
|
if (*currentPosition == '-')
|
|
tzNegative = true;
|
|
else if (*currentPosition == '+')
|
|
tzNegative = false;
|
|
else {
|
|
isLocalTime = true;
|
|
return currentPosition;
|
|
}
|
|
++currentPosition;
|
|
|
|
long tzHours = 0;
|
|
long tzHoursAbs = 0;
|
|
long tzMinutes = 0;
|
|
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &tzHours))
|
|
return nullptr;
|
|
if (*postParsePosition != ':') {
|
|
if ((postParsePosition - currentPosition) == 2) {
|
|
// "00" case.
|
|
tzHoursAbs = labs(tzHours);
|
|
} else if ((postParsePosition - currentPosition) == 4) {
|
|
// "0000" case.
|
|
tzHoursAbs = labs(tzHours);
|
|
tzMinutes = tzHoursAbs % 100;
|
|
tzHoursAbs = tzHoursAbs / 100;
|
|
} else
|
|
return nullptr;
|
|
} else {
|
|
// "00:00" case.
|
|
if ((postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
tzHoursAbs = labs(tzHours);
|
|
currentPosition = postParsePosition + 1; // Skip ":".
|
|
|
|
if (!isASCIIDigit(*currentPosition))
|
|
return nullptr;
|
|
if (!parseLong(currentPosition, &postParsePosition, 10, &tzMinutes))
|
|
return nullptr;
|
|
if ((postParsePosition - currentPosition) != 2)
|
|
return nullptr;
|
|
}
|
|
currentPosition = postParsePosition;
|
|
|
|
if (tzHoursAbs > 24)
|
|
return nullptr;
|
|
if (tzMinutes < 0 || tzMinutes > 59)
|
|
return nullptr;
|
|
|
|
timeZoneSeconds = 60 * (tzMinutes + (60 * tzHoursAbs));
|
|
if (tzNegative)
|
|
timeZoneSeconds = -timeZoneSeconds;
|
|
|
|
return currentPosition;
|
|
}
|
|
|
|
double parseES5DateFromNullTerminatedCharacters(const char* dateString, bool& isLocalTime)
|
|
{
|
|
isLocalTime = false;
|
|
|
|
// This parses a date of the form defined in ecma262/#sec-date-time-string-format
|
|
// (similar to RFC 3339 / ISO 8601: YYYY-MM-DDTHH:mm:ss[.sss]Z).
|
|
// In most cases it is intentionally strict (e.g. correct field widths, no stray whitespace).
|
|
|
|
static const long daysPerMonth[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
|
|
|
|
// The year must be present, but the other fields may be omitted - see ES5.1 15.9.1.15.
|
|
int year = 0;
|
|
long month = 1;
|
|
long day = 1;
|
|
long hours = 0;
|
|
long minutes = 0;
|
|
long seconds = 0;
|
|
double milliseconds = 0;
|
|
long timeZoneSeconds = 0;
|
|
|
|
// Parse the date YYYY[-MM[-DD]]
|
|
char* currentPosition = parseES5DatePortion(dateString, year, month, day);
|
|
if (!currentPosition)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
// Look for a time portion.
|
|
// Note: As of ES2016, when a UTC offset is missing, date-time forms are local time while date-only forms are UTC.
|
|
if (*currentPosition == 'T') {
|
|
// Parse the time HH:mm[:ss[.sss]][Z|(+|-)(00:00|0000|00)]
|
|
currentPosition = parseES5TimePortion(currentPosition + 1, hours, minutes, seconds, milliseconds, isLocalTime, timeZoneSeconds);
|
|
if (!currentPosition)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
}
|
|
// Check that we have parsed all characters in the string.
|
|
if (*currentPosition)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// A few of these checks could be done inline above, but since many of them are interrelated
|
|
// we would be sacrificing readability to "optimize" the (presumably less common) failure path.
|
|
if (month < 1 || month > 12)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (day < 1 || day > daysPerMonth[month - 1])
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (month == 2 && day > 28 && !isLeapYear(year))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (hours < 0 || hours > 24)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (hours == 24 && (minutes || seconds))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (minutes < 0 || minutes > 59)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (seconds < 0 || seconds >= 61)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (seconds == 60) {
|
|
// Discard leap seconds by clamping to the end of a minute.
|
|
milliseconds = 0;
|
|
}
|
|
|
|
return ymdhmsToMilliseconds(year, month, day, hours, minutes, seconds, milliseconds) - (timeZoneSeconds * msPerSecond);
|
|
}
|
|
|
|
// Odd case where 'exec' is allowed to be 0, to accomodate a caller in WebCore.
|
|
double parseDateFromNullTerminatedCharacters(const char* dateString, bool& isLocalTime)
|
|
{
|
|
isLocalTime = true;
|
|
int offset = 0;
|
|
|
|
// This parses a date in the form:
|
|
// Tuesday, 09-Nov-99 23:12:40 GMT
|
|
// or
|
|
// Sat, 01-Jan-2000 08:00:00 GMT
|
|
// or
|
|
// Sat, 01 Jan 2000 08:00:00 GMT
|
|
// or
|
|
// 01 Jan 99 22:00 +0100 (exceptions in rfc822/rfc2822)
|
|
// ### non RFC formats, added for Javascript:
|
|
// [Wednesday] January 09 1999 23:12:40 GMT
|
|
// [Wednesday] January 09 23:12:40 GMT 1999
|
|
//
|
|
// We ignore the weekday.
|
|
|
|
// Skip leading space
|
|
skipSpacesAndComments(dateString);
|
|
|
|
long month = -1;
|
|
const char *wordStart = dateString;
|
|
// Check contents of first words if not number
|
|
while (*dateString && !isASCIIDigit(*dateString)) {
|
|
if (isASCIISpace(*dateString) || *dateString == '(') {
|
|
if (dateString - wordStart >= 3)
|
|
month = findMonth(wordStart);
|
|
skipSpacesAndComments(dateString);
|
|
wordStart = dateString;
|
|
} else
|
|
dateString++;
|
|
}
|
|
|
|
// Missing delimiter between month and day (like "January29")?
|
|
if (month == -1 && wordStart != dateString)
|
|
month = findMonth(wordStart);
|
|
|
|
skipSpacesAndComments(dateString);
|
|
|
|
if (!*dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// ' 09-Nov-99 23:12:40 GMT'
|
|
char* newPosStr;
|
|
long day;
|
|
if (!parseLong(dateString, &newPosStr, 10, &day))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
|
|
if (day < 0)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
std::optional<int> year;
|
|
if (day > 31) {
|
|
// ### where is the boundary and what happens below?
|
|
if (*dateString != '/')
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
// looks like a YYYY/MM/DD date
|
|
if (!*++dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (day <= std::numeric_limits<int>::min() || day >= std::numeric_limits<int>::max())
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
year = static_cast<int>(day);
|
|
if (!parseLong(dateString, &newPosStr, 10, &month))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
month -= 1;
|
|
dateString = newPosStr;
|
|
if (*dateString++ != '/' || !*dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (!parseLong(dateString, &newPosStr, 10, &day))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
} else if (*dateString == '/' && month == -1) {
|
|
dateString++;
|
|
// This looks like a MM/DD/YYYY date, not an RFC date.
|
|
month = day - 1; // 0-based
|
|
if (!parseLong(dateString, &newPosStr, 10, &day))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (day < 1 || day > 31)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
if (*dateString == '/')
|
|
dateString++;
|
|
if (!*dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
} else {
|
|
if (*dateString == '-')
|
|
dateString++;
|
|
|
|
skipSpacesAndComments(dateString);
|
|
|
|
if (*dateString == ',')
|
|
dateString++;
|
|
|
|
if (month == -1) { // not found yet
|
|
month = findMonth(dateString);
|
|
if (month == -1)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
while (*dateString && *dateString != '-' && *dateString != ',' && !isASCIISpace(*dateString))
|
|
dateString++;
|
|
|
|
if (!*dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// '-99 23:12:40 GMT'
|
|
if (*dateString != '-' && *dateString != '/' && *dateString != ',' && !isASCIISpace(*dateString))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString++;
|
|
}
|
|
}
|
|
|
|
if (month < 0 || month > 11)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// '99 23:12:40 GMT'
|
|
if (*dateString && !year) {
|
|
int result = 0;
|
|
if (!parseInt(dateString, &newPosStr, 10, &result))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
year = result;
|
|
}
|
|
|
|
// Don't fail if the time is missing.
|
|
long hour = 0;
|
|
long minute = 0;
|
|
long second = 0;
|
|
if (!*newPosStr)
|
|
dateString = newPosStr;
|
|
else {
|
|
// ' 23:12:40 GMT'
|
|
if (!(isASCIISpace(*newPosStr) || *newPosStr == ',')) {
|
|
if (*newPosStr != ':')
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
// There was no year; the number was the hour.
|
|
year = std::nullopt;
|
|
} else {
|
|
// in the normal case (we parsed the year), advance to the next number
|
|
dateString = ++newPosStr;
|
|
skipSpacesAndComments(dateString);
|
|
}
|
|
|
|
parseLong(dateString, &newPosStr, 10, &hour);
|
|
// Do not check for errno here since we want to continue
|
|
// even if errno was set becasue we are still looking
|
|
// for the timezone!
|
|
|
|
// Read a number? If not, this might be a timezone name.
|
|
if (newPosStr != dateString) {
|
|
dateString = newPosStr;
|
|
|
|
if (hour < 0 || hour > 23)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
if (!*dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// ':12:40 GMT'
|
|
if (*dateString++ != ':')
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
if (!parseLong(dateString, &newPosStr, 10, &minute))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
|
|
if (minute < 0 || minute > 59)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// ':40 GMT'
|
|
if (*dateString && *dateString != ':' && !isASCIISpace(*dateString))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// seconds are optional in rfc822 + rfc2822
|
|
if (*dateString ==':') {
|
|
dateString++;
|
|
|
|
if (!parseLong(dateString, &newPosStr, 10, &second))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
|
|
if (second < 0 || second > 59)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
}
|
|
|
|
skipSpacesAndComments(dateString);
|
|
|
|
if (startsWithLettersIgnoringASCIICase(dateString, "am")) {
|
|
if (hour > 12)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (hour == 12)
|
|
hour = 0;
|
|
dateString += 2;
|
|
skipSpacesAndComments(dateString);
|
|
} else if (startsWithLettersIgnoringASCIICase(dateString, "pm")) {
|
|
if (hour > 12)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
if (hour != 12)
|
|
hour += 12;
|
|
dateString += 2;
|
|
skipSpacesAndComments(dateString);
|
|
}
|
|
}
|
|
}
|
|
|
|
// The year may be after the time but before the time zone.
|
|
if (isASCIIDigit(*dateString) && !year) {
|
|
int result = 0;
|
|
if (!parseInt(dateString, &newPosStr, 10, &result))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
year = result;
|
|
dateString = newPosStr;
|
|
skipSpacesAndComments(dateString);
|
|
}
|
|
|
|
// Don't fail if the time zone is missing.
|
|
// Some websites omit the time zone (4275206).
|
|
if (*dateString) {
|
|
if (startsWithLettersIgnoringASCIICase(dateString, "gmt") || startsWithLettersIgnoringASCIICase(dateString, "utc")) {
|
|
dateString += 3;
|
|
isLocalTime = false;
|
|
}
|
|
|
|
if (*dateString == '+' || *dateString == '-') {
|
|
int o;
|
|
if (!parseInt(dateString, &newPosStr, 10, &o))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
|
|
if (o < -9959 || o > 9959)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
int sgn = (o < 0) ? -1 : 1;
|
|
o = abs(o);
|
|
if (*dateString != ':') {
|
|
if (o >= 24)
|
|
offset = ((o / 100) * 60 + (o % 100)) * sgn;
|
|
else
|
|
offset = o * 60 * sgn;
|
|
} else { // GMT+05:00
|
|
++dateString; // skip the ':'
|
|
int o2;
|
|
if (!parseInt(dateString, &newPosStr, 10, &o2))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
dateString = newPosStr;
|
|
offset = (o * 60 + o2) * sgn;
|
|
}
|
|
isLocalTime = false;
|
|
} else {
|
|
for (auto& knownZone : knownZones) {
|
|
// Since the passed-in length is used for both strings, the following checks that
|
|
// dateString has the time zone name as a prefix, not that it is equal.
|
|
auto length = strlen(knownZone.tzName);
|
|
if (equalLettersIgnoringASCIICase(dateString, knownZone.tzName, length)) {
|
|
offset = knownZone.tzOffset;
|
|
dateString += length;
|
|
isLocalTime = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
skipSpacesAndComments(dateString);
|
|
|
|
if (*dateString && !year) {
|
|
int result = 0;
|
|
if (!parseInt(dateString, &newPosStr, 10, &result))
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
year = result;
|
|
dateString = newPosStr;
|
|
skipSpacesAndComments(dateString);
|
|
}
|
|
|
|
// Trailing garbage
|
|
if (*dateString)
|
|
return std::numeric_limits<double>::quiet_NaN();
|
|
|
|
// Y2K: Handle 2 digit years.
|
|
if (year) {
|
|
int yearValue = year.value();
|
|
if (yearValue >= 0 && yearValue < 100) {
|
|
if (yearValue < 50)
|
|
yearValue += 2000;
|
|
else
|
|
yearValue += 1900;
|
|
}
|
|
year = yearValue;
|
|
} else {
|
|
// We select 2000 as default value. This is because of the following reasons.
|
|
// 1. Year 2000 was used for the initial value of the variable `year`. While it won't be posed to users in WebKit,
|
|
// V8 used this 2000 as its default value. (As of April 2017, V8 is using the year 2001 and Spider Monkey is
|
|
// not doing this kind of fallback.)
|
|
// 2. It is a leap year. When using `new Date("Feb 29")`, we assume that people want to save month and day.
|
|
// Leap year can save user inputs if they is valid. If we use the current year instead, the current year
|
|
// may not be a leap year. In that case, `new Date("Feb 29").getMonth()` becomes 2 (March).
|
|
year = 2000;
|
|
}
|
|
ASSERT(year);
|
|
|
|
return ymdhmsToMilliseconds(year.value(), month + 1, day, hour, minute, second, 0) - offset * (secondsPerMinute * msPerSecond);
|
|
}
|
|
|
|
double parseDateFromNullTerminatedCharacters(const char* dateString)
|
|
{
|
|
bool isLocalTime;
|
|
double value = parseDateFromNullTerminatedCharacters(dateString, isLocalTime);
|
|
|
|
if (isLocalTime)
|
|
value -= calculateLocalTimeOffset(value, LocalTime).offset;
|
|
|
|
return value;
|
|
}
|
|
|
|
// See http://tools.ietf.org/html/rfc2822#section-3.3 for more information.
|
|
String makeRFC2822DateString(unsigned dayOfWeek, unsigned day, unsigned month, unsigned year, unsigned hours, unsigned minutes, unsigned seconds, int utcOffset)
|
|
{
|
|
StringBuilder stringBuilder;
|
|
stringBuilder.append(weekdayName[dayOfWeek], ", ", day, ' ', monthName[month], ' ', year, ' ');
|
|
|
|
appendTwoDigitNumber(stringBuilder, hours);
|
|
stringBuilder.append(':');
|
|
appendTwoDigitNumber(stringBuilder, minutes);
|
|
stringBuilder.append(':');
|
|
appendTwoDigitNumber(stringBuilder, seconds);
|
|
stringBuilder.append(' ');
|
|
|
|
stringBuilder.append(utcOffset > 0 ? '+' : '-');
|
|
int absoluteUTCOffset = abs(utcOffset);
|
|
appendTwoDigitNumber(stringBuilder, absoluteUTCOffset / 60);
|
|
appendTwoDigitNumber(stringBuilder, absoluteUTCOffset % 60);
|
|
|
|
return stringBuilder.toString();
|
|
}
|
|
|
|
} // namespace WTF
|