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349 lines
11 KiB
C++
349 lines
11 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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* Copyright (C) 2003-2013, International Business Machines Corporation
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* and others. All Rights Reserved.
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******************************************************************************
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*
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* File PERSNCAL.CPP
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*
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* Modification History:
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*
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* Date Name Description
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* 9/23/2003 mehran posted to icu-design
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* 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote
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* based on the implementation of Gregorian
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*****************************************************************************
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*/
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#include "persncal.h"
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#if !UCONFIG_NO_FORMATTING
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#include "uassert.h"
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#include "umutex.h"
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#include "gregoimp.h" // Math
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#include <float.h>
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#include "cmemory.h"
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#include "ucln_in.h"
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#include "unicode/uniset.h"
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static const int16_t kPersianNumDays[]
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= {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year
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static const int8_t kPersianMonthLength[]
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= {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based
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static const int8_t kPersianLeapMonthLength[]
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= {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based
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static const int32_t kPersianCalendarLimits[UCAL_FIELD_COUNT][4] = {
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// Minimum Greatest Least Maximum
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// Minimum Maximum
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{ 0, 0, 0, 0}, // ERA
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{ -5000000, -5000000, 5000000, 5000000}, // YEAR
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{ 0, 0, 11, 11}, // MONTH
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{ 1, 1, 52, 53}, // WEEK_OF_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
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{ 1, 1, 29, 31}, // DAY_OF_MONTH
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{ 1, 1, 365, 366}, // DAY_OF_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
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{ 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
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{ -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
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{ -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
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{/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
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{ 0, 0, 11, 11}, // ORDINAL_MONTH
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};
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namespace { // anonymous
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static const icu::UnicodeSet *gLeapCorrection = nullptr;
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static icu::UInitOnce gCorrectionInitOnce {};
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static int32_t gMinCorrection;
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} // namespace
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U_CDECL_BEGIN
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static UBool calendar_persian_cleanup() {
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if (gLeapCorrection) {
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delete gLeapCorrection;
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gLeapCorrection = nullptr;
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}
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gCorrectionInitOnce.reset();
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return true;
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}
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U_CDECL_END
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namespace { // anonymous
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static void U_CALLCONV initLeapCorrection() {
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static int16_t nonLeapYears[] = {
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1502, 1601, 1634, 1667, 1700, 1733, 1766, 1799, 1832, 1865, 1898, 1931, 1964, 1997, 2030, 2059,
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2063, 2096, 2129, 2158, 2162, 2191, 2195, 2224, 2228, 2257, 2261, 2290, 2294, 2323, 2327, 2356,
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2360, 2389, 2393, 2422, 2426, 2455, 2459, 2488, 2492, 2521, 2525, 2554, 2558, 2587, 2591, 2620,
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2624, 2653, 2657, 2686, 2690, 2719, 2723, 2748, 2752, 2756, 2781, 2785, 2789, 2818, 2822, 2847,
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2851, 2855, 2880, 2884, 2888, 2913, 2917, 2921, 2946, 2950, 2954, 2979, 2983, 2987,
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};
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gMinCorrection = nonLeapYears[0];
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icu::UnicodeSet prefab;
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for (auto year : nonLeapYears) {
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prefab.add(year);
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}
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gLeapCorrection = prefab.cloneAsThawed()->freeze();
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ucln_i18n_registerCleanup(UCLN_I18N_PERSIAN_CALENDAR, calendar_persian_cleanup);
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}
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const icu::UnicodeSet* getLeapCorrection() {
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umtx_initOnce(gCorrectionInitOnce, &initLeapCorrection);
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return gLeapCorrection;
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}
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} // namespace anonymous
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U_NAMESPACE_BEGIN
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static const int32_t PERSIAN_EPOCH = 1948320;
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// Implementation of the PersianCalendar class
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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const char *PersianCalendar::getType() const {
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return "persian";
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}
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PersianCalendar* PersianCalendar::clone() const {
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return new PersianCalendar(*this);
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}
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PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
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: Calendar(TimeZone::forLocaleOrDefault(aLocale), aLocale, success)
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{
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}
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PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
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}
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PersianCalendar::~PersianCalendar()
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{
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}
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//-------------------------------------------------------------------------
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// Minimum / Maximum access functions
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//-------------------------------------------------------------------------
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int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
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return kPersianCalendarLimits[field][limitType];
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}
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//-------------------------------------------------------------------------
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// Assorted calculation utilities
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//
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/**
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* Determine whether a year is a leap year in the Persian calendar
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*/
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UBool PersianCalendar::isLeapYear(int32_t year)
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{
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if (year >= gMinCorrection && getLeapCorrection()->contains(year)) {
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return false;
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}
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if (year > gMinCorrection && getLeapCorrection()->contains(year-1)) {
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return true;
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}
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int64_t y = static_cast<int64_t>(year) * 25LL + 11LL;
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bool res = (y % 33L < 8);
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return res;
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}
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/**
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* Return the day # on which the given year starts. Days are counted
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* from the Persian epoch, origin 0.
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*/
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int32_t PersianCalendar::yearStart(int32_t year, UErrorCode& status) {
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return handleComputeMonthStart(year,0,false, status);
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}
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/**
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* Return the day # on which the given month starts. Days are counted
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* from the Persian epoch, origin 0.
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*
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* @param year The Persian year
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* @param year The Persian month, 0-based
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*/
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int32_t PersianCalendar::monthStart(int32_t year, int32_t month, UErrorCode& status) const {
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return handleComputeMonthStart(year,month,true, status);
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}
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//----------------------------------------------------------------------
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// Calendar framework
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//----------------------------------------------------------------------
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The Persian year
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* @param year The Persian month, 0-based
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*/
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int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month, UErrorCode& /*status*/) const {
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// If the month is out of range, adjust it into range, and
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// modify the extended year value accordingly.
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if (month < 0 || month > 11) {
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extendedYear += ClockMath::floorDivide(month, 12, &month);
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}
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return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month];
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}
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/**
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* Return the number of days in the given Persian year
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*/
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int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear, UErrorCode& status) const {
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if (U_FAILURE(status)) return 0;
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return isLeapYear(extendedYear) ? 366 : 365;
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}
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//-------------------------------------------------------------------------
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// Functions for converting from field values to milliseconds....
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//-------------------------------------------------------------------------
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static int64_t firstJulianOfYear(int64_t year) {
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int64_t julianDay = 365LL * (year - 1LL) + ClockMath::floorDivide(8LL * year + 21, 33);
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if (year > gMinCorrection && getLeapCorrection()->contains(year-1)) {
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julianDay--;
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}
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return julianDay;
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}
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// Return JD of start of given month/year
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int64_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/, UErrorCode& status) const {
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if (U_FAILURE(status)) {
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return 0;
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}
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// If the month is out of range, adjust it into range, and
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// modify the extended year value accordingly.
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if (month < 0 || month > 11) {
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if (uprv_add32_overflow(eyear, ClockMath::floorDivide(month, 12, &month), &eyear)) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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}
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int64_t julianDay = PERSIAN_EPOCH - 1LL + firstJulianOfYear(eyear);
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if (month != 0) {
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julianDay += kPersianNumDays[month];
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}
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return julianDay;
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}
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//-------------------------------------------------------------------------
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// Functions for converting from milliseconds to field values
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//-------------------------------------------------------------------------
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int32_t PersianCalendar::handleGetExtendedYear(UErrorCode& status) {
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if (U_FAILURE(status)) {
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return 0;
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}
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if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
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return internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
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}
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return internalGet(UCAL_YEAR, 1); // Default to year 1
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}
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/**
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* Override Calendar to compute several fields specific to the Persian
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called.
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*/
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void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& status) {
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int64_t daysSinceEpoch = julianDay;
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daysSinceEpoch -= PERSIAN_EPOCH;
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int64_t year = ClockMath::floorDivideInt64(
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33LL * daysSinceEpoch + 3LL, 12053LL) + 1LL;
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if (year > INT32_MAX || year < INT32_MIN) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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int64_t farvardin1 = firstJulianOfYear(year);
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int32_t dayOfYear = daysSinceEpoch - farvardin1; // 0-based
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U_ASSERT(dayOfYear >= 0);
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U_ASSERT(dayOfYear < 366);
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if (dayOfYear == 365 && year >= gMinCorrection && getLeapCorrection()->contains(year)) {
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year++;
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dayOfYear = 0;
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}
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int32_t month;
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if (dayOfYear < 216) { // Compute 0-based month
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month = dayOfYear / 31;
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} else {
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month = (dayOfYear - 6) / 30;
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}
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U_ASSERT(month >= 0);
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U_ASSERT(month < 12);
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++dayOfYear; // Make it 1-based now
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int32_t dayOfMonth = dayOfYear - kPersianNumDays[month];
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U_ASSERT(dayOfMonth > 0);
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U_ASSERT(dayOfMonth <= 31);
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internalSet(UCAL_ERA, 0);
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internalSet(UCAL_YEAR, year);
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internalSet(UCAL_EXTENDED_YEAR, year);
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internalSet(UCAL_MONTH, month);
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internalSet(UCAL_ORDINAL_MONTH, month);
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internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
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internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
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}
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constexpr uint32_t kPersianRelatedYearDiff = 622;
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int32_t PersianCalendar::getRelatedYear(UErrorCode &status) const
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{
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int32_t year = get(UCAL_EXTENDED_YEAR, status);
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if (U_FAILURE(status)) {
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return 0;
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}
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if (uprv_add32_overflow(year, kPersianRelatedYearDiff, &year)) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return 0;
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}
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return year;
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}
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void PersianCalendar::setRelatedYear(int32_t year)
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{
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// set extended year
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set(UCAL_EXTENDED_YEAR, year - kPersianRelatedYearDiff);
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}
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IMPL_SYSTEM_DEFAULT_CENTURY(PersianCalendar, "@calendar=persian")
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
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U_NAMESPACE_END
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#endif
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