679 lines
26 KiB
C++
679 lines
26 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 2003-2014, 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 ISLAMCAL.H
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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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* 10/14/2003 srl ported from java IslamicCalendar
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*****************************************************************************
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*/
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#include "islamcal.h"
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#if !UCONFIG_NO_FORMATTING
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#include "umutex.h"
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#include <float.h>
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#include "gregoimp.h" // Math
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#include "astro.h" // CalendarAstronomer
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#include "uhash.h"
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#include "ucln_in.h"
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#include "uassert.h"
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static const UDate HIJRA_MILLIS = -42521587200000.0; // 7/16/622 AD 00:00
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// Debugging
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#ifdef U_DEBUG_ISLAMCAL
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# include <stdio.h>
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# include <stdarg.h>
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static void debug_islamcal_loc(const char *f, int32_t l)
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{
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fprintf(stderr, "%s:%d: ", f, l);
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}
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static void debug_islamcal_msg(const char *pat, ...)
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{
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va_list ap;
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va_start(ap, pat);
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vfprintf(stderr, pat, ap);
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fflush(stderr);
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}
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// must use double parens, i.e.: U_DEBUG_ISLAMCAL_MSG(("four is: %d",4));
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#define U_DEBUG_ISLAMCAL_MSG(x) {debug_islamcal_loc(__FILE__,__LINE__);debug_islamcal_msg x;}
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#else
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#define U_DEBUG_ISLAMCAL_MSG(x)
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#endif
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// --- The cache --
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// cache of months
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static UMutex astroLock = U_MUTEX_INITIALIZER; // pod bay door lock
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static icu::CalendarCache *gMonthCache = NULL;
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static icu::CalendarAstronomer *gIslamicCalendarAstro = NULL;
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U_CDECL_BEGIN
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static UBool calendar_islamic_cleanup(void) {
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if (gMonthCache) {
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delete gMonthCache;
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gMonthCache = NULL;
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}
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if (gIslamicCalendarAstro) {
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delete gIslamicCalendarAstro;
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gIslamicCalendarAstro = NULL;
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}
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return TRUE;
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}
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U_CDECL_END
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U_NAMESPACE_BEGIN
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// Implementation of the IslamicCalendar class
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/**
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* Friday EPOC
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*/
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static const int32_t CIVIL_EPOC = 1948440;
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/**
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* Thursday EPOC
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*/
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static const int32_t ASTRONOMICAL_EPOC = 1948439;
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static const int32_t UMALQURA_YEAR_START = 1318;
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static const int32_t UMALQURA_YEAR_END = 1480;
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static const int UMALQURA_MONTHLENGTH[] = {
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//* 1318 -1322 */ "0101 0111 0100", "1001 0111 0110", "0100 1011 0111", "0010 0101 0111", "0101 0010 1011",
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0x0574, 0x0975, 0x06A7, 0x0257, 0x052B,
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//* 1323 -1327 */ "0110 1001 0101", "0110 1100 1010", "1010 1101 0101", "0101 0101 1011", "0010 0101 1101",
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0x0695, 0x06CA, 0x0AD5, 0x055B, 0x025B,
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//* 1328 -1332 */ "1001 0010 1101", "1100 1001 0101", "1101 0100 1010", "1110 1010 0101", "0110 1101 0010",
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0x092D, 0x0C95, 0x0D4A, 0x0E5B, 0x025B,
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//* 1333 -1337 */ "1010 1101 0101", "0101 0101 1010", "1010 1010 1011", "0100 0100 1011", "0110 1010 0101",
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0x0AD5, 0x055A, 0x0AAB, 0x044B, 0x06A5,
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//* 1338 -1342 */ "0111 0101 0010", "1011 1010 1001", "0011 0111 0100", "1010 1011 0110", "0101 0101 0110",
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0x0752, 0x0BA9, 0x0374, 0x0AB6, 0x0556,
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//* 1343 -1347 */ "1010 1010 1010", "1101 0101 0010", "1101 1010 1001", "0101 1101 0100", "1010 1110 1010",
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0x0AAA, 0x0D52, 0x0DA9, 0x05D4, 0x0AEA,
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//* 1348 -1352 */ "0100 1101 1101", "0010 0110 1110", "1001 0010 1110", "1010 1010 0110", "1101 0101 0100",
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0x04DD, 0x026E, 0x092E, 0x0AA6, 0x0D54,
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//* 1353 -1357 */ "0101 1010 1010", "0101 1011 0101", "0010 1011 0100", "1001 0011 0111", "0100 1001 1011",
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0x05AA, 0x05B5, 0x02B4, 0x0937, 0x049B,
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//* 1358 -1362 */ "1010 0100 1011", "1011 0010 0101", "1011 0101 0100", "1011 0110 1010", "0101 0110 1101",
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0x0A4B, 0x0B25, 0x0B54, 0x0B6A, 0x056D,
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//* 1363 -1367 */ "0100 1010 1101", "1010 0101 0101", "1101 0010 0101", "1110 1001 0010", "1110 1100 1001",
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0x04AD, 0x0A55, 0x0D25, 0x0E92, 0x0EC9,
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//* 1368 -1372 */ "0110 1101 0100", "1010 1110 1010", "0101 0110 1011", "0100 1010 1011", "0110 1000 0101",
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0x06D4, 0x0ADA, 0x056B, 0x04AB, 0x0685,
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//* 1373 -1377 */ "1011 0100 1001", "1011 1010 0100", "1011 1011 0010", "0101 1011 0101", "0010 1011 1010",
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0x0B49, 0x0BA4, 0x0BB2, 0x05B5, 0x02BA,
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//* 1378 -1382 */ "1001 0101 1011", "0100 1010 1011", "0101 0101 0101", "0110 1011 0010", "0110 1101 1001",
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0x095B, 0x04AB, 0x0555, 0x06B2, 0x06D9,
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//* 1383 -1387 */ "0010 1110 1100", "1001 0110 1110", "0100 1010 1110", "1010 0101 0110", "1101 0010 1010",
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0x02EC, 0x096E, 0x04AE, 0x0A56, 0x0D2A,
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//* 1388 -1392 */ "1101 0101 0101", "0101 1010 1010", "1010 1011 0101", "0100 1011 1011", "0000 0101 1011",
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0x0D55, 0x05AA, 0x0AB5, 0x04BB, 0x005B,
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//* 1393 -1397 */ "1001 0010 1011", "1010 1001 0101", "0011 0100 1010", "1011 1010 0101", "0101 1010 1010",
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0x092B, 0x0A95, 0x034A, 0x0BA5, 0x05AA,
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//* 1398 -1402 */ "1010 1011 0101", "0101 0101 0110", "1010 1001 0110", "1101 0100 1010", "1110 1010 0101",
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0x0AB5, 0x0556, 0x0A96, 0x0B4A, 0x0EA5,
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//* 1403 -1407 */ "0111 0101 0010", "0110 1110 1001", "0011 0110 1010", "1010 1010 1101", "0101 0101 0101",
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0x0752, 0x06E9, 0x036A, 0x0AAD, 0x0555,
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//* 1408 -1412 */ "1010 1010 0101", "1011 0101 0010", "1011 1010 1001", "0101 1011 0100", "1001 1011 1010",
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0x0AA5, 0x0B52, 0x0BA9, 0x05B4, 0x09BA,
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//* 1413 -1417 */ "0100 1101 1011", "0010 0101 1101", "0101 0010 1101", "1010 1010 0101", "1010 1101 0100",
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0x04DB, 0x025D, 0x052D, 0x0AA5, 0x0AD4,
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//* 1418 -1422 */ "1010 1110 1010", "0101 0110 1101", "0100 1011 1101", "0010 0011 1101", "1001 0001 1101",
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0x0AEA, 0x056D, 0x04BD, 0x023D, 0x091D,
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//* 1423 -1427 */ "1010 1001 0101", "1011 0100 1010", "1011 0101 1010", "0101 0110 1101", "0010 1011 0110",
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0x0A95, 0x0B4A, 0x0B5A, 0x056D, 0x02B6,
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//* 1428 -1432 */ "1001 0011 1011", "0100 1001 1011", "0110 0101 0101", "0110 1010 1001", "0111 0101 0100",
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0x093B, 0x049B, 0x0655, 0x06A9, 0x0754,
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//* 1433 -1437 */ "1011 0110 1010", "0101 0110 1100", "1010 1010 1101", "0101 0101 0101", "1011 0010 1001",
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0x0B6A, 0x056C, 0x0AAD, 0x0555, 0x0B29,
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//* 1438 -1442 */ "1011 1001 0010", "1011 1010 1001", "0101 1101 0100", "1010 1101 1010", "0101 0101 1010",
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0x0B92, 0x0BA9, 0x05D4, 0x0ADA, 0x055A,
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//* 1443 -1447 */ "1010 1010 1011", "0101 1001 0101", "0111 0100 1001", "0111 0110 0100", "1011 1010 1010",
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0x0AAB, 0x0595, 0x0749, 0x0764, 0x0BAA,
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//* 1448 -1452 */ "0101 1011 0101", "0010 1011 0110", "1010 0101 0110", "1110 0100 1101", "1011 0010 0101",
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0x05B5, 0x02B6, 0x0A56, 0x0E4D, 0x0B25,
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//* 1453 -1457 */ "1011 0101 0010", "1011 0110 1010", "0101 1010 1101", "0010 1010 1110", "1001 0010 1111",
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0x0B52, 0x0B6A, 0x05AD, 0x02AE, 0x092F,
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//* 1458 -1462 */ "0100 1001 0111", "0110 0100 1011", "0110 1010 0101", "0110 1010 1100", "1010 1101 0110",
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0x0497, 0x064B, 0x06A5, 0x06AC, 0x0AD6,
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//* 1463 -1467 */ "0101 0101 1101", "0100 1001 1101", "1010 0100 1101", "1101 0001 0110", "1101 1001 0101",
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0x055D, 0x049D, 0x0A4D, 0x0D16, 0x0D95,
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//* 1468 -1472 */ "0101 1010 1010", "0101 1011 0101", "0010 1001 1010", "1001 0101 1011", "0100 1010 1100",
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0x05AA, 0x05B5, 0x029A, 0x095B, 0x04AC,
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//* 1473 -1477 */ "0101 1001 0101", "0110 1100 1010", "0110 1110 0100", "1010 1110 1010", "0100 1111 0101",
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0x0595, 0x06CA, 0x06E4, 0x0AEA, 0x04F5,
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//* 1478 -1480 */ "0010 1011 0110", "1001 0101 0110", "1010 1010 1010"
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0x02B6, 0x0956, 0x0AAA
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};
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int32_t getUmalqura_MonthLength(int32_t y, int32_t m) {
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int32_t mask = (int32_t) (0x01 << (11 - m)); // set mask for bit corresponding to month
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if((UMALQURA_MONTHLENGTH[y] & mask) == 0 )
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return 29;
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else
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return 30;
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}
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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const char *IslamicCalendar::getType() const {
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const char *sType = NULL;
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switch (cType) {
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case CIVIL:
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sType = "islamic-civil";
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break;
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case ASTRONOMICAL:
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sType = "islamic";
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break;
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case TBLA:
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sType = "islamic-tbla";
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break;
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case UMALQURA:
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sType = "islamic-umalqura";
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break;
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default:
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U_ASSERT(false); // out of range
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sType = "islamic"; // "islamic" is used as the generic type
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break;
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}
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return sType;
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}
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Calendar* IslamicCalendar::clone() const {
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return new IslamicCalendar(*this);
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}
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IslamicCalendar::IslamicCalendar(const Locale& aLocale, UErrorCode& success, ECalculationType type)
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: Calendar(TimeZone::createDefault(), aLocale, success),
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cType(type)
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{
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setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
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}
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IslamicCalendar::IslamicCalendar(const IslamicCalendar& other) : Calendar(other), cType(other.cType) {
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}
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IslamicCalendar::~IslamicCalendar()
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{
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}
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void IslamicCalendar::setCalculationType(ECalculationType type, UErrorCode &status)
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{
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if (cType != type) {
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// The fields of the calendar will become invalid, because the calendar
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// rules are different
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UDate m = getTimeInMillis(status);
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cType = type;
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clear();
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setTimeInMillis(m, status);
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}
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}
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/**
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* Returns <code>true</code> if this object is using the fixed-cycle civil
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* calendar, or <code>false</code> if using the religious, astronomical
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* calendar.
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* @draft ICU 2.4
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*/
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UBool IslamicCalendar::isCivil() {
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return (cType == CIVIL);
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}
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//-------------------------------------------------------------------------
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// Minimum / Maximum access functions
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//-------------------------------------------------------------------------
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// Note: Current IslamicCalendar implementation does not work
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// well with negative years.
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// TODO: In some cases the current ICU Islamic calendar implementation shows
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// a month as having 31 days. Since date parsing now uses range checks based
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// on the table below, we need to change the range for last day of month to
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// include 31 as a workaround until the implementation is fixed.
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static const int32_t LIMITS[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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{ 1, 1, 5000000, 5000000}, // YEAR
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{ 0, 0, 11, 11}, // MONTH
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{ 1, 1, 50, 51}, // 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 - 31 to workaround for cal implementation bug, should be 30
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{ 1, 1, 354, 355}, // 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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{ 1, 1, 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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{ 1, 1, 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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};
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/**
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* @draft ICU 2.4
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*/
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int32_t IslamicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
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return LIMITS[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 Islamic civil calendar
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*/
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UBool IslamicCalendar::civilLeapYear(int32_t year)
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{
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return (14 + 11 * year) % 30 < 11;
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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 Hijri epoch, origin 0.
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*/
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int32_t IslamicCalendar::yearStart(int32_t year) const{
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if (cType == CIVIL || cType == TBLA ||
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(cType == UMALQURA && year < UMALQURA_YEAR_START))
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{
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return (year-1)*354 + ClockMath::floorDivide((3+11*year),30);
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} else if(cType==ASTRONOMICAL){
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return trueMonthStart(12*(year-1));
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} else {
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int32_t ys = yearStart(UMALQURA_YEAR_START-1);
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ys+= handleGetYearLength(UMALQURA_YEAR_START-1);
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for(int i=UMALQURA_YEAR_START; i< year; i++){
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ys+= handleGetYearLength(i);
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}
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return ys;
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}
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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 Hijri epoch, origin 0.
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*
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* @param year The hijri year
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* @param year The hijri month, 0-based
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*/
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int32_t IslamicCalendar::monthStart(int32_t year, int32_t month) const {
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if (cType == CIVIL || cType == TBLA) {
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return (int32_t)uprv_ceil(29.5*month)
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+ (year-1)*354 + (int32_t)ClockMath::floorDivide((3+11*year),30);
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} else if(cType==ASTRONOMICAL){
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return trueMonthStart(12*(year-1) + month);
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} else {
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int32_t ms = yearStart(year);
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for(int i=0; i< month; i++){
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ms+= handleGetMonthLength(year, i);
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}
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return ms;
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}
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}
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/**
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* Find the day number on which a particular month of the true/lunar
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* Islamic calendar starts.
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*
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* @param month The month in question, origin 0 from the Hijri epoch
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*
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* @return The day number on which the given month starts.
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*/
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int32_t IslamicCalendar::trueMonthStart(int32_t month) const
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{
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UErrorCode status = U_ZERO_ERROR;
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int32_t start = CalendarCache::get(&gMonthCache, month, status);
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if (start==0) {
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// Make a guess at when the month started, using the average length
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UDate origin = HIJRA_MILLIS
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+ uprv_floor(month * CalendarAstronomer::SYNODIC_MONTH) * kOneDay;
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// moonAge will fail due to memory allocation error
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double age = moonAge(origin, status);
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if (U_FAILURE(status)) {
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goto trueMonthStartEnd;
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}
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if (age >= 0) {
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// The month has already started
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do {
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origin -= kOneDay;
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age = moonAge(origin, status);
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if (U_FAILURE(status)) {
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goto trueMonthStartEnd;
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}
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} while (age >= 0);
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}
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else {
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// Preceding month has not ended yet.
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do {
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origin += kOneDay;
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age = moonAge(origin, status);
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if (U_FAILURE(status)) {
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goto trueMonthStartEnd;
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}
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} while (age < 0);
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}
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start = (int32_t)ClockMath::floorDivide((origin - HIJRA_MILLIS), (double)kOneDay) + 1;
|
|
CalendarCache::put(&gMonthCache, month, start, status);
|
|
}
|
|
trueMonthStartEnd :
|
|
if(U_FAILURE(status)) {
|
|
start = 0;
|
|
}
|
|
return start;
|
|
}
|
|
|
|
/**
|
|
* Return the "age" of the moon at the given time; this is the difference
|
|
* in ecliptic latitude between the moon and the sun. This method simply
|
|
* calls CalendarAstronomer.moonAge, converts to degrees,
|
|
* and adjusts the result to be in the range [-180, 180].
|
|
*
|
|
* @param time The time at which the moon's age is desired,
|
|
* in millis since 1/1/1970.
|
|
*/
|
|
double IslamicCalendar::moonAge(UDate time, UErrorCode &status)
|
|
{
|
|
double age = 0;
|
|
|
|
umtx_lock(&astroLock);
|
|
if(gIslamicCalendarAstro == NULL) {
|
|
gIslamicCalendarAstro = new CalendarAstronomer();
|
|
if (gIslamicCalendarAstro == NULL) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
return age;
|
|
}
|
|
ucln_i18n_registerCleanup(UCLN_I18N_ISLAMIC_CALENDAR, calendar_islamic_cleanup);
|
|
}
|
|
gIslamicCalendarAstro->setTime(time);
|
|
age = gIslamicCalendarAstro->getMoonAge();
|
|
umtx_unlock(&astroLock);
|
|
|
|
// Convert to degrees and normalize...
|
|
age = age * 180 / CalendarAstronomer::PI;
|
|
if (age > 180) {
|
|
age = age - 360;
|
|
}
|
|
|
|
return age;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Calendar framework
|
|
//----------------------------------------------------------------------
|
|
|
|
/**
|
|
* Return the length (in days) of the given month.
|
|
*
|
|
* @param year The hijri year
|
|
* @param year The hijri month, 0-based
|
|
* @draft ICU 2.4
|
|
*/
|
|
int32_t IslamicCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
|
|
|
|
int32_t length = 0;
|
|
|
|
if (cType == CIVIL || cType == TBLA ||
|
|
(cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) {
|
|
length = 29 + (month+1) % 2;
|
|
if (month == DHU_AL_HIJJAH && civilLeapYear(extendedYear)) {
|
|
length++;
|
|
}
|
|
} else if(cType == ASTRONOMICAL){
|
|
month = 12*(extendedYear-1) + month;
|
|
length = trueMonthStart(month+1) - trueMonthStart(month) ;
|
|
} else {
|
|
length = getUmalqura_MonthLength(extendedYear - UMALQURA_YEAR_START, month);
|
|
}
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* Return the number of days in the given Islamic year
|
|
* @draft ICU 2.4
|
|
*/
|
|
int32_t IslamicCalendar::handleGetYearLength(int32_t extendedYear) const {
|
|
if (cType == CIVIL || cType == TBLA ||
|
|
(cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) {
|
|
return 354 + (civilLeapYear(extendedYear) ? 1 : 0);
|
|
} else if(cType == ASTRONOMICAL){
|
|
int32_t month = 12*(extendedYear-1);
|
|
return (trueMonthStart(month + 12) - trueMonthStart(month));
|
|
} else {
|
|
int len = 0;
|
|
for(int i=0; i<12; i++)
|
|
len += handleGetMonthLength(extendedYear, i);
|
|
return len;
|
|
}
|
|
}
|
|
|
|
//-------------------------------------------------------------------------
|
|
// Functions for converting from field values to milliseconds....
|
|
//-------------------------------------------------------------------------
|
|
|
|
// Return JD of start of given month/year
|
|
/**
|
|
* @draft ICU 2.4
|
|
*/
|
|
int32_t IslamicCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */) const {
|
|
return monthStart(eyear, month) + 1948439;
|
|
}
|
|
|
|
//-------------------------------------------------------------------------
|
|
// Functions for converting from milliseconds to field values
|
|
//-------------------------------------------------------------------------
|
|
|
|
/**
|
|
* @draft ICU 2.4
|
|
*/
|
|
int32_t IslamicCalendar::handleGetExtendedYear() {
|
|
int32_t year;
|
|
if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
|
|
year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
|
|
} else {
|
|
year = internalGet(UCAL_YEAR, 1); // Default to year 1
|
|
}
|
|
return year;
|
|
}
|
|
|
|
/**
|
|
* Override Calendar to compute several fields specific to the Islamic
|
|
* calendar system. These are:
|
|
*
|
|
* <ul><li>ERA
|
|
* <li>YEAR
|
|
* <li>MONTH
|
|
* <li>DAY_OF_MONTH
|
|
* <li>DAY_OF_YEAR
|
|
* <li>EXTENDED_YEAR</ul>
|
|
*
|
|
* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
|
|
* method is called. The getGregorianXxx() methods return Gregorian
|
|
* calendar equivalents for the given Julian day.
|
|
* @draft ICU 2.4
|
|
*/
|
|
void IslamicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
|
|
int32_t year, month, dayOfMonth, dayOfYear;
|
|
UDate startDate;
|
|
int32_t days = julianDay - CIVIL_EPOC;
|
|
|
|
if (cType == CIVIL || cType == TBLA) {
|
|
if(cType == TBLA)
|
|
days = julianDay - ASTRONOMICAL_EPOC;
|
|
// Use the civil calendar approximation, which is just arithmetic
|
|
year = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 );
|
|
month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 );
|
|
month = month<11?month:11;
|
|
startDate = monthStart(year, month);
|
|
} else if(cType == ASTRONOMICAL){
|
|
// Guess at the number of elapsed full months since the epoch
|
|
int32_t months = (int32_t)uprv_floor((double)days / CalendarAstronomer::SYNODIC_MONTH);
|
|
|
|
startDate = uprv_floor(months * CalendarAstronomer::SYNODIC_MONTH);
|
|
|
|
double age = moonAge(internalGetTime(), status);
|
|
if (U_FAILURE(status)) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
return;
|
|
}
|
|
if ( days - startDate >= 25 && age > 0) {
|
|
// If we're near the end of the month, assume next month and search backwards
|
|
months++;
|
|
}
|
|
|
|
// Find out the last time that the new moon was actually visible at this longitude
|
|
// This returns midnight the night that the moon was visible at sunset.
|
|
while ((startDate = trueMonthStart(months)) > days) {
|
|
// If it was after the date in question, back up a month and try again
|
|
months--;
|
|
}
|
|
|
|
year = months / 12 + 1;
|
|
month = months % 12;
|
|
} else if(cType == UMALQURA) {
|
|
int32_t umalquraStartdays = yearStart(UMALQURA_YEAR_START) ;
|
|
if( days < umalquraStartdays){
|
|
//Use Civil calculation
|
|
year = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 );
|
|
month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 );
|
|
month = month<11?month:11;
|
|
startDate = monthStart(year, month);
|
|
}else{
|
|
int y =UMALQURA_YEAR_START-1, m =0;
|
|
long d = 1;
|
|
while(d > 0){
|
|
y++;
|
|
d = days - yearStart(y) +1;
|
|
if(d == handleGetYearLength(y)){
|
|
m=11;
|
|
break;
|
|
}else if(d < handleGetYearLength(y) ){
|
|
int monthLen = handleGetMonthLength(y, m);
|
|
m=0;
|
|
while(d > monthLen){
|
|
d -= monthLen;
|
|
m++;
|
|
monthLen = handleGetMonthLength(y, m);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
year = y;
|
|
month = m;
|
|
}
|
|
} else { // invalid 'civil'
|
|
U_ASSERT(false); // should not get here, out of range
|
|
year=month=0;
|
|
}
|
|
|
|
dayOfMonth = (days - monthStart(year, month)) + 1;
|
|
|
|
// Now figure out the day of the year.
|
|
dayOfYear = (days - monthStart(year, 0) + 1);
|
|
|
|
|
|
internalSet(UCAL_ERA, 0);
|
|
internalSet(UCAL_YEAR, year);
|
|
internalSet(UCAL_EXTENDED_YEAR, year);
|
|
internalSet(UCAL_MONTH, month);
|
|
internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
|
|
internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
|
|
}
|
|
|
|
UBool
|
|
IslamicCalendar::inDaylightTime(UErrorCode& status) const
|
|
{
|
|
// copied from GregorianCalendar
|
|
if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
|
|
return FALSE;
|
|
|
|
// Force an update of the state of the Calendar.
|
|
((IslamicCalendar*)this)->complete(status); // cast away const
|
|
|
|
return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
|
|
}
|
|
|
|
/**
|
|
* The system maintains a static default century start date and Year. They are
|
|
* initialized the first time they are used. Once the system default century date
|
|
* and year are set, they do not change.
|
|
*/
|
|
static UDate gSystemDefaultCenturyStart = DBL_MIN;
|
|
static int32_t gSystemDefaultCenturyStartYear = -1;
|
|
static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
|
|
|
|
|
|
UBool IslamicCalendar::haveDefaultCentury() const
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
UDate IslamicCalendar::defaultCenturyStart() const
|
|
{
|
|
// lazy-evaluate systemDefaultCenturyStart
|
|
umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
|
|
return gSystemDefaultCenturyStart;
|
|
}
|
|
|
|
int32_t IslamicCalendar::defaultCenturyStartYear() const
|
|
{
|
|
// lazy-evaluate systemDefaultCenturyStartYear
|
|
umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
|
|
return gSystemDefaultCenturyStartYear;
|
|
}
|
|
|
|
|
|
void U_CALLCONV
|
|
IslamicCalendar::initializeSystemDefaultCentury()
|
|
{
|
|
// initialize systemDefaultCentury and systemDefaultCenturyYear based
|
|
// on the current time. They'll be set to 80 years before
|
|
// the current time.
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
IslamicCalendar calendar(Locale("@calendar=islamic-civil"),status);
|
|
if (U_SUCCESS(status)) {
|
|
calendar.setTime(Calendar::getNow(), status);
|
|
calendar.add(UCAL_YEAR, -80, status);
|
|
|
|
gSystemDefaultCenturyStart = calendar.getTime(status);
|
|
gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
|
|
}
|
|
// We have no recourse upon failure unless we want to propagate the failure
|
|
// out.
|
|
}
|
|
|
|
|
|
|
|
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IslamicCalendar)
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif
|
|
|