// Copyright (C) 2021 The Qt Company Ltd. // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only #ifndef QCALENDAR_BACKEND_P_H #define QCALENDAR_BACKEND_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 #include #include #include #include #include #include QT_BEGIN_NAMESPACE namespace QtPrivate { class QCalendarRegistry; } // Locale-related parts, mostly handled in ../text/qlocale.cpp struct QCalendarLocale { quint16 m_language_id, m_script_id, m_territory_id; #define rangeGetter(name) \ QLocaleData::DataRange name() const { return { m_ ## name ## _idx, m_ ## name ## _size }; } rangeGetter(longMonthStandalone) rangeGetter(longMonth) rangeGetter(shortMonthStandalone) rangeGetter(shortMonth) rangeGetter(narrowMonthStandalone) rangeGetter(narrowMonth) #undef rangeGetter // Month name indexes: quint16 m_longMonthStandalone_idx, m_longMonth_idx; quint16 m_shortMonthStandalone_idx, m_shortMonth_idx; quint16 m_narrowMonthStandalone_idx, m_narrowMonth_idx; // Twelve long month names (separated by commas) can add up to more than 256 // QChars - e.g. kde_TZ gets to 264. quint16 m_longMonthStandalone_size, m_longMonth_size; quint8 m_shortMonthStandalone_size, m_shortMonth_size; quint8 m_narrowMonthStandalone_size, m_narrowMonth_size; }; // Partial implementation, of methods with common forms, in qcalendar.cpp class Q_CORE_EXPORT QCalendarBackend { friend class QCalendar; friend class QtPrivate::QCalendarRegistry; public: virtual ~QCalendarBackend(); virtual QString name() const = 0; QStringList names() const; QCalendar::System calendarSystem() const; QCalendar::SystemId calendarId() const { return m_id; } // Date queries: virtual int daysInMonth(int month, int year = QCalendar::Unspecified) const = 0; virtual int daysInYear(int year) const; virtual int monthsInYear(int year) const; virtual bool isDateValid(int year, int month, int day) const; // Properties of the calendar: virtual bool isLeapYear(int year) const = 0; virtual bool isLunar() const = 0; virtual bool isLuniSolar() const = 0; virtual bool isSolar() const = 0; virtual bool isProleptic() const; virtual bool hasYearZero() const; virtual int maximumDaysInMonth() const; virtual int minimumDaysInMonth() const; virtual int maximumMonthsInYear() const; // Julian Day conversions: virtual bool dateToJulianDay(int year, int month, int day, qint64 *jd) const = 0; virtual QCalendar::YearMonthDay julianDayToDate(qint64 jd) const = 0; // Day of week and week numbering: virtual int dayOfWeek(qint64 jd) const; // Names of months and week-days (implemented in qlocale.cpp): virtual QString monthName(const QLocale &locale, int month, int year, QLocale::FormatType format) const; virtual QString standaloneMonthName(const QLocale &locale, int month, int year, QLocale::FormatType format) const; virtual QString weekDayName(const QLocale &locale, int day, QLocale::FormatType format) const; virtual QString standaloneWeekDayName(const QLocale &locale, int day, QLocale::FormatType format) const; // Formatting of date-times (implemented in qlocale.cpp): virtual QString dateTimeToString(QStringView format, const QDateTime &datetime, QDate dateOnly, QTime timeOnly, const QLocale &locale) const; bool isGregorian() const; QCalendar::SystemId registerCustomBackend(const QStringList &names); // Calendar enumeration by name: static QStringList availableCalendars(); protected: // Locale support: virtual const QCalendarLocale *localeMonthIndexData() const = 0; virtual const char16_t *localeMonthData() const = 0; private: QCalendar::SystemId m_id; void setIndex(size_t index); // QCalendar's access to its registry: static const QCalendarBackend *fromName(QAnyStringView name); static const QCalendarBackend *fromId(QCalendar::SystemId id); // QCalendar's access to singletons: static const QCalendarBackend *fromEnum(QCalendar::System system); static const QCalendarBackend *gregorian(); }; QT_END_NAMESPACE #endif // QCALENDAR_BACKEND_P_H