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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qglobal.h"
#include "qislamiccivilcalendar_p.h"
#include "qcalendarmath_p.h"
#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE
using namespace QRoundingDown;
/*!
\since 5.14
\internal
\class QIslamicCivilCalendar
\inmodule QtCore
\brief Implements a commonly-used computed version of the Islamic calendar.
\section1 Civil Islamic Calendar
QIslamicCivilCalendar implements a tabular version of the Hijri calendar
which is known as the Islamic Civil Calendar. It has the same numbering of
years and months, but the months are determined by arithmetical rules rather
than by observation or astronomical calculations.
\section2 Calendar Organization
The civil calendar follows the usual tabular scheme of odd-numbered months
and the last month of each leap year being 30 days long, the rest being 29
days long. Its determination of leap years follows a 30-year cycle, in each
of which the years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26 and 29 are leap
years.
\sa QHijriCalendar, QCalendar
*/
QIslamicCivilCalendar::QIslamicCivilCalendar()
: QHijriCalendar(QStringLiteral("Islamic Civil"), QCalendar::System::IslamicCivil)
{
registerAlias(QStringLiteral("islamic-civil")); // CLDR name
registerAlias(QStringLiteral("islamicc")); // old CLDR name, still (2018) used by Mozilla
// Until we have a oncrete implementation that knows all the needed ephemerides:
registerAlias(QStringLiteral("Islamic"));
}
QString QIslamicCivilCalendar::name() const
{
return QStringLiteral("Islamic Civil");
}
QCalendar::System QIslamicCivilCalendar::calendarSystem() const
{
return QCalendar::System::IslamicCivil;
}
bool QIslamicCivilCalendar::isLeapYear(int year) const
{
if (year == QCalendar::Unspecified)
return false;
if (year < 0)
++year;
return qMod(year * 11 + 14, 30) < 11;
}
bool QIslamicCivilCalendar::dateToJulianDay(int year, int month, int day, qint64 *jd) const
{
Q_ASSERT(jd);
if (!isDateValid(year, month, day))
return false;
if (year <= 0)
++year;
*jd = qDiv(10631 * year - 10617, 30)
+ qDiv(325 * month - 320, 11)
+ day + 1948439;
return true;
}
QCalendar::YearMonthDay QIslamicCivilCalendar::julianDayToDate(qint64 jd) const
{
const qint64 epoch = 1948440;
const int32_t k2 = 30 * (jd - epoch) + 15;
const int32_t k1 = 11 * qDiv(qMod(k2, 10631), 30) + 5;
int y = qDiv(k2, 10631) + 1;
const int month = qDiv(k1, 325) + 1;
const int day = qDiv(qMod(k1, 325), 11) + 1;
return QCalendar::YearMonthDay(y > 0 ? y : y - 1, month, day);
}
QT_END_NAMESPACE
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