Add support for the Islamic Civil calendar

This has its own locale data, extracted from CLDR. This data may
potentially be shared with other variants on the Islamic calendar, so
is handled by a separate base-class, QHijriCalendar, on which such
variants may base their implementations.

[ChangeLog][QtCore][QCalendar] Added support for the Islamic Civil
calendar, controlled by feature islamiccivilcalendar, with locale data
that can be shared with other implementations, controlled by feature
hijricalendar.

Fixes: QTBUG-56675
Change-Id: Idf32d3da7034baa8ec5e66ef847e59a8a2f31cbd
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 83 insertions, 0 deletions

diff --git a/src/corelib/time/qhijricalendar_p.h b/src/corelib/time/qhijricalendar_p.h
new file mode 100644
index 0000000000..8f15495d11
--- /dev/null
+++ b/src/corelib/time/qhijricalendar_p.h
@@ -0,0 +1,83 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QHIJRI_CALENDAR_P_H
+#define QHIJRI_CALENDAR_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of calendar implementations.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/private/qglobal_p.h>
+#include "qcalendarbackend_p.h"
+
+QT_REQUIRE_CONFIG(hijricalendar);
+
+QT_BEGIN_NAMESPACE
+
+// Base for sharing with other variants on the Islamic calendar, as needed:
+class Q_CORE_EXPORT QHijriCalendar : public QCalendarBackend
+{
+public:
+    int daysInMonth(int month, int year = QCalendar::Unspecified) const override;
+    int maxDaysInMonth() const override;
+    int daysInYear(int year) const override;
+
+    bool isLunar() const override;
+    bool isLuniSolar() const override;
+    bool isSolar() const override;
+
+protected:
+    const QCalendarLocale *localeMonthIndexData() const override;
+    const ushort *localeMonthData() const override;
+    // (The INTEGRITY compiler got upset at: using QCalendarBackend:QCalendarBackend;)
+    QHijriCalendar(const QString &name, QCalendar::System id = QCalendar::System::User)
+        : QCalendarBackend(name, id) {}
+};
+
+QT_END_NAMESPACE
+
+#endif // QHIJRI_CALENDAR_P_H