icuSources/i18n/islamcal.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 ******************************************************************************
   5 * Copyright (C) 2003-2015, International Business Machines Corporation
   6 * and others. All Rights Reserved.
   7 ******************************************************************************
   8 *
   9 * File ISLAMCAL.H
  10 *
  11 * Modification History:
  12 *
  13 *   Date        Name        Description
  14 *   10/14/2003  srl         ported from java IslamicCalendar
  15 *****************************************************************************
  16 */
  17
  18 #include "islamcal.h"
  19
  20 #if !UCONFIG_NO_FORMATTING
  21
  22 #include "umutex.h"
  23 #include <float.h>
  24 #include "gregoimp.h" // Math
  25 #include "astro.h" // CalendarAstronomer
  26 #include "uhash.h"
  27 #include "ucln_in.h"
  28 #include "uassert.h"
  29
  30 static const UDate HIJRA_MILLIS = -42521587200000.0;    // 7/16/622 AD 00:00
  31
  32 // Debugging
  33 #ifdef U_DEBUG_ISLAMCAL
  34 # include <stdio.h>
  35 # include <stdarg.h>
  36 static void debug_islamcal_loc(const char *f, int32_t l)
  37 {
  38     fprintf(stderr, "%s:%d: ", f, l);
  39 }
  40
  41 static void debug_islamcal_msg(const char *pat, ...)
  42 {
  43     va_list ap;
  44     va_start(ap, pat);
  45     vfprintf(stderr, pat, ap);
  46     fflush(stderr);
  47 }
  48 // must use double parens, i.e.:  U_DEBUG_ISLAMCAL_MSG(("four is: %d",4));
  49 #define U_DEBUG_ISLAMCAL_MSG(x) {debug_islamcal_loc(__FILE__,__LINE__);debug_islamcal_msg x;}
  50 #else
  51 #define U_DEBUG_ISLAMCAL_MSG(x)
  52 #endif
  53
  54
  55 // --- The cache --
  56 // cache of months
  57 static UMutex astroLock = U_MUTEX_INITIALIZER;  // pod bay door lock
  58 static icu::CalendarCache *gMonthCache = NULL;
  59 static icu::CalendarAstronomer *gIslamicCalendarAstro = NULL;
  60
  61 U_CDECL_BEGIN
  62 static UBool calendar_islamic_cleanup(void) {
  63     if (gMonthCache) {
  64         delete gMonthCache;
  65         gMonthCache = NULL;
  66     }
  67     if (gIslamicCalendarAstro) {
  68         delete gIslamicCalendarAstro;
  69         gIslamicCalendarAstro = NULL;
  70     }
  71     return TRUE;
  72 }
  73 U_CDECL_END
  74
  75 U_NAMESPACE_BEGIN
  76
  77 // Implementation of the IslamicCalendar class
  78
  79 /**
  80  * Friday EPOC
  81  */
  82 static const int32_t CIVIL_EPOC = 1948440; // CE 622 July 16 Friday (Julian calendar) / CE 622 July 19 (Gregorian calendar)
  83
  84 /**
  85   * Thursday EPOC
  86   */
  87 static const int32_t ASTRONOMICAL_EPOC = 1948439; // CE 622 July 15 Thursday (Julian calendar)
  88
  89
  90 static const int32_t UMALQURA_YEAR_START = 1300;
  91 static const int32_t UMALQURA_YEAR_END = 1600;
  92
  93 static const int UMALQURA_MONTHLENGTH[] = {
  94     //* 1300 -1302 */ "1010 1010 1010", "1101 0101 0100", "1110 1100 1001",
  95                             0x0AAA,           0x0D54,           0x0EC9,
  96     //* 1303 -1307 */ "0110 1101 0100", "0110 1110 1010", "0011 0110 1100", "1010 1010 1101", "0101 0101 0101",
  97                             0x06D4,           0x06EA,           0x036C,           0x0AAD,           0x0555,
  98     //* 1308 -1312 */ "0110 1010 1001", "0111 1001 0010", "1011 1010 1001", "0101 1101 0100", "1010 1101 1010",
  99                             0x06A9,           0x0792,           0x0BA9,           0x05D4,           0x0ADA,
 100     //* 1313 -1317 */ "0101 0101 1100", "1101 0010 1101", "0110 1001 0101", "0111 0100 1010", "1011 0101 0100",
 101                             0x055C,           0x0D2D,           0x0695,           0x074A,           0x0B54,
 102     //* 1318 -1322 */ "1011 0110 1010", "0101 1010 1101", "0100 1010 1110", "1010 0100 1111", "0101 0001 0111",
 103                             0x0B6A,           0x05AD,           0x04AE,           0x0A4F,           0x0517,
 104     //* 1323 -1327 */ "0110 1000 1011", "0110 1010 0101", "1010 1101 0101", "0010 1101 0110", "1001 0101 1011",
 105                             0x068B,           0x06A5,           0x0AD5,           0x02D6,           0x095B,
 106     //* 1328 -1332 */ "0100 1001 1101", "1010 0100 1101", "1101 0010 0110", "1101 1001 0101", "0101 1010 1100",
 107                             0x049D,           0x0A4D,           0x0D26,           0x0D95,           0x05AC,
 108     //* 1333 -1337 */ "1001 1011 0110", "0010 1011 1010", "1010 0101 1011", "0101 0010 1011", "1010 1001 0101",
 109                             0x09B6,           0x02BA,           0x0A5B,           0x052B,           0x0A95,
 110     //* 1338 -1342 */ "0110 1100 1010", "1010 1110 1001", "0010 1111 0100", "1001 0111 0110", "0010 1011 0110",
 111                             0x06CA,           0x0AE9,           0x02F4,           0x0976,           0x02B6,
 112     //* 1343 -1347 */ "1001 0101 0110", "1010 1100 1010", "1011 1010 0100", "1011 1101 0010", "0101 1101 1001",
 113                             0x0956,           0x0ACA,           0x0BA4,           0x0BD2,           0x05D9,
 114     //* 1348 -1352 */ "0010 1101 1100", "1001 0110 1101", "0101 0100 1101", "1010 1010 0101", "1011 0101 0010",
 115                             0x02DC,           0x096D,           0x054D,           0x0AA5,           0x0B52,
 116     //* 1353 -1357 */ "1011 1010 0101", "0101 1011 0100", "1001 1011 0110", "0101 0101 0111", "0010 1001 0111",
 117                             0x0BA5,           0x05B4,           0x09B6,           0x0557,           0x0297,
 118     //* 1358 -1362 */ "0101 0100 1011", "0110 1010 0011", "0111 0101 0010", "1011 0110 0101", "0101 0110 1010",
 119                             0x054B,           0x06A3,           0x0752,           0x0B65,           0x056A,
 120     //* 1363 -1367 */ "1010 1010 1011", "0101 0010 1011", "1100 1001 0101", "1101 0100 1010", "1101 1010 0101",
 121                             0x0AAB,           0x052B,           0x0C95,           0x0D4A,           0x0DA5,
 122     //* 1368 -1372 */ "0101 1100 1010", "1010 1101 0110", "1001 0101 0111", "0100 1010 1011", "1001 0100 1011",
 123                             0x05CA,           0x0AD6,           0x0957,           0x04AB,           0x094B,
 124     //* 1373 -1377 */ "1010 1010 0101", "1011 0101 0010", "1011 0110 1010", "0101 0111 0101", "0010 0111 0110",
 125                             0x0AA5,           0x0B52,           0x0B6A,           0x0575,           0x0276,
 126     //* 1378 -1382 */ "1000 1011 0111", "0100 0101 1011", "0101 0101 0101", "0101 1010 1001", "0101 1011 0100",
 127                             0x08B7,           0x045B,           0x0555,           0x05A9,           0x05B4,
 128     //* 1383 -1387 */ "1001 1101 1010", "0100 1101 1101", "0010 0110 1110", "1001 0011 0110", "1010 1010 1010",
 129                             0x09DA,           0x04DD,           0x026E,           0x0936,           0x0AAA,
 130     //* 1388 -1392 */ "1101 0101 0100", "1101 1011 0010", "0101 1101 0101", "0010 1101 1010", "1001 0101 1011",
 131                             0x0D54,           0x0DB2,           0x05D5,           0x02DA,           0x095B,
 132     //* 1393 -1397 */ "0100 1010 1011", "1010 0101 0101", "1011 0100 1001", "1011 0110 0100", "1011 0111 0001",
 133                             0x04AB,           0x0A55,           0x0B49,           0x0B64,           0x0B71,
 134     //* 1398 -1402 */ "0101 1011 0100", "1010 1011 0101", "1010 0101 0101", "1101 0010 0101", "1110 1001 0010",
 135                             0x05B4,           0x0AB5,           0x0A55,           0x0D25,           0x0E92,
 136     //* 1403 -1407 */ "1110 1100 1001", "0110 1101 0100", "1010 1110 1001", "1001 0110 1011", "0100 1010 1011",
 137                             0x0EC9,           0x06D4,           0x0AE9,           0x096B,           0x04AB,
 138     //* 1408 -1412 */ "1010 1001 0011", "1101 0100 1001", "1101 1010 0100", "1101 1011 0010", "1010 1011 1001",
 139                             0x0A93,           0x0D49,         0x0DA4,           0x0DB2,           0x0AB9,
 140     //* 1413 -1417 */ "0100 1011 1010", "1010 0101 1011", "0101 0010 1011", "1010 1001 0101", "1011 0010 1010",
 141                             0x04BA,           0x0A5B,           0x052B,           0x0A95,           0x0B2A,
 142     //* 1418 -1422 */ "1011 0101 0101", "0101 0101 1100", "0100 1011 1101", "0010 0011 1101", "1001 0001 1101",
 143                             0x0B55,           0x055C,           0x04BD,           0x023D,           0x091D,
 144     //* 1423 -1427 */ "1010 1001 0101", "1011 0100 1010", "1011 0101 1010", "0101 0110 1101", "0010 1011 0110",
 145                             0x0A95,           0x0B4A,           0x0B5A,           0x056D,           0x02B6,
 146     //* 1428 -1432 */ "1001 0011 1011", "0100 1001 1011", "0110 0101 0101", "0110 1010 1001", "0111 0101 0100",
 147                             0x093B,           0x049B,           0x0655,           0x06A9,           0x0754,
 148     //* 1433 -1437 */ "1011 0110 1010", "0101 0110 1100", "1010 1010 1101", "0101 0101 0101", "1011 0010 1001",
 149                             0x0B6A,           0x056C,           0x0AAD,           0x0555,           0x0B29,
 150     //* 1438 -1442 */ "1011 1001 0010", "1011 1010 1001", "0101 1101 0100", "1010 1101 1010", "0101 0101 1010",
 151                             0x0B92,           0x0BA9,           0x05D4,           0x0ADA,           0x055A,
 152     //* 1443 -1447 */ "1010 1010 1011", "0101 1001 0101", "0111 0100 1001", "0111 0110 0100", "1011 1010 1010",
 153                             0x0AAB,           0x0595,           0x0749,           0x0764,           0x0BAA,
 154     //* 1448 -1452 */ "0101 1011 0101", "0010 1011 0110", "1010 0101 0110", "1110 0100 1101", "1011 0010 0101",
 155                             0x05B5,           0x02B6,           0x0A56,           0x0E4D,           0x0B25,
 156     //* 1453 -1457 */ "1011 0101 0010", "1011 0110 1010", "0101 1010 1101", "0010 1010 1110", "1001 0010 1111",
 157                             0x0B52,           0x0B6A,           0x05AD,           0x02AE,           0x092F,
 158     //* 1458 -1462 */ "0100 1001 0111", "0110 0100 1011", "0110 1010 0101", "0110 1010 1100", "1010 1101 0110",
 159                             0x0497,           0x064B,           0x06A5,           0x06AC,           0x0AD6,
 160     //* 1463 -1467 */ "0101 0101 1101", "0100 1001 1101", "1010 0100 1101", "1101 0001 0110", "1101 1001 0101",
 161                             0x055D,           0x049D,           0x0A4D,           0x0D16,           0x0D95,
 162     //* 1468 -1472 */ "0101 1010 1010", "0101 1011 0101", "0010 1101 1010", "1001 0101 1011", "0100 1010 1101",
 163                             0x05AA,           0x05B5,           0x02DA,           0x095B,           0x04AD,
 164     //* 1473 -1477 */ "0101 1001 0101", "0110 1100 1010", "0110 1110 0100", "1010 1110 1010", "0100 1111 0101",
 165                             0x0595,           0x06CA,           0x06E4,           0x0AEA,           0x04F5,
 166     //* 1478 -1482 */ "0010 1011 0110", "1001 0101 0110", "1010 1010 1010", "1011 0101 0100", "1011 1101 0010",
 167                             0x02B6,           0x0956,           0x0AAA,           0x0B54,           0x0BD2,
 168     //* 1483 -1487 */ "0101 1101 1001", "0010 1110 1010", "1001 0110 1101", "0100 1010 1101", "1010 1001 0101",
 169                             0x05D9,           0x02EA,           0x096D,           0x04AD,           0x0A95,
 170     //* 1488 -1492 */ "1011 0100 1010", "1011 1010 0101", "0101 1011 0010", "1001 1011 0101", "0100 1101 0110",
 171                             0x0B4A,           0x0BA5,           0x05B2,           0x09B5,           0x04D6,
 172     //* 1493 -1497 */ "1010 1001 0111", "0101 0100 0111", "0110 1001 0011", "0111 0100 1001", "1011 0101 0101",
 173                             0x0A97,           0x0547,           0x0693,           0x0749,           0x0B55,
 174     //* 1498 -1508 */ "0101 0110 1010", "1010 0110 1011", "0101 0010 1011", "1010 1000 1011", "1101 0100 0110", "1101 1010 0011", "0101 1100 1010", "1010 1101 0110", "0100 1101 1011", "0010 0110 1011", "1001 0100 1011",
 175                             0x056A,           0x0A6B,           0x052B,           0x0A8B,           0x0D46,           0x0DA3,           0x05CA,           0x0AD6,           0x04DB,           0x026B,           0x094B,
 176     //* 1509 -1519 */ "1010 1010 0101", "1011 0101 0010", "1011 0110 1001", "0101 0111 0101", "0001 0111 0110", "1000 1011 0111", "0010 0101 1011", "0101 0010 1011", "0101 0110 0101", "0101 1011 0100", "1001 1101 1010",
 177                             0x0AA5,           0x0B52,           0x0B69,           0x0575,           0x0176,           0x08B7,           0x025B,           0x052B,           0x0565,           0x05B4,           0x09DA,
 178     //* 1520 -1530 */ "0100 1110 1101", "0001 0110 1101", "1000 1011 0110", "1010 1010 0110", "1101 0101 0010", "1101 1010 1001", "0101 1101 0100", "1010 1101 1010", "1001 0101 1011", "0100 1010 1011", "0110 0101 0011",
 179                             0x04ED,           0x016D,           0x08B6,           0x0AA6,           0x0D52,           0x0DA9,           0x05D4,           0x0ADA,           0x095B,           0x04AB,           0x0653,
 180     //* 1531 -1541 */ "0111 0010 1001", "0111 0110 0010", "1011 1010 1001", "0101 1011 0010", "1010 1011 0101", "0101 0101 0101", "1011 0010 0101", "1101 1001 0010", "1110 1100 1001", "0110 1101 0010", "1010 1110 1001",
 181                             0x0729,           0x0762,           0x0BA9,           0x05B2,           0x0AB5,           0x0555,           0x0B25,           0x0D92,           0x0EC9,           0x06D2,           0x0AE9,
 182     //* 1542 -1552 */ "0101 0110 1011", "0100 1010 1011", "1010 0101 0101", "1101 0010 1001", "1101 0101 0100", "1101 1010 1010", "1001 1011 0101", "0100 1011 1010", "1010 0011 1011", "0100 1001 1011", "1010 0100 1101",
 183                             0x056B,           0x04AB,           0x0A55,           0x0D29,           0x0D54,           0x0DAA,           0x09B5,           0x04BA,           0x0A3B,           0x049B,           0x0A4D,
 184     //* 1553 -1563 */ "1010 1010 1010", "1010 1101 0101", "0010 1101 1010", "1001 0101 1101", "0100 0101 1110", "1010 0010 1110", "1100 1001 1010", "1101 0101 0101", "0110 1011 0010", "0110 1011 1001", "0100 1011 1010",
 185                             0x0AAA,           0x0AD5,           0x02DA,           0x095D,           0x045E,           0x0A2E,           0x0C9A,           0x0D55,           0x06B2,           0x06B9,           0x04BA,
 186     //* 1564 -1574 */ "1010 0101 1101", "0101 0010 1101", "1010 1001 0101", "1011 0101 0010", "1011 1010 1000", "1011 1011 0100", "0101 1011 1001", "0010 1101 1010", "1001 0101 1010", "1011 0100 1010", "1101 1010 0100",
 187                             0x0A5D,           0x052D,           0x0A95,           0x0B52,           0x0BA8,           0x0BB4,           0x05B9,           0x02DA,           0x095A,           0x0B4A,           0x0DA4,
 188     //* 1575 -1585 */ "1110 1101 0001", "0110 1110 1000", "1011 0110 1010", "0101 0110 1101", "0101 0011 0101", "0110 1001 0101", "1101 0100 1010", "1101 1010 1000", "1101 1101 0100", "0110 1101 1010", "0101 0101 1011",
 189                             0x0ED1,           0x06E8,           0x0B6A,           0x056D,           0x0535,           0x0695,           0x0D4A,           0x0DA8,           0x0DD4,           0x06DA,           0x055B,
 190     //* 1586 -1596 */ "0010 1001 1101", "0110 0010 1011", "1011 0001 0101", "1011 0100 1010", "1011 1001 0101", "0101 1010 1010", "1010 1010 1110", "1001 0010 1110", "1100 1000 1111", "0101 0010 0111", "0110 1001 0101",
 191                             0x029D,           0x062B,           0x0B15,           0x0B4A,           0x0B95,           0x05AA,           0x0AAE,           0x092E,           0x0C8F,           0x0527,           0x0695,
 192     //* 1597 -1600 */ "0110 1010 1010", "1010 1101 0110", "0101 0101 1101", "0010 1001 1101", };
 193                             0x06AA,           0x0AD6,           0x055D,           0x029D
 194 };
 195
 196 int32_t getUmalqura_MonthLength(int32_t y, int32_t m) {
 197     int32_t mask = (int32_t) (0x01 << (11 - m));    // set mask for bit corresponding to month
 198     if((UMALQURA_MONTHLENGTH[y] & mask) == 0 )
 199         return 29;
 200     else
 201         return 30;
 202
 203 }
 204
 205 //-------------------------------------------------------------------------
 206 // Constructors...
 207 //-------------------------------------------------------------------------
 208
 209 const char *IslamicCalendar::getType() const {
 210     const char *sType = NULL;
 211
 212     switch (cType) {
 213     case CIVIL:
 214         sType = "islamic-civil";
 215         break;
 216     case ASTRONOMICAL:
 217         sType = "islamic";
 218         break;
 219     case TBLA:
 220         sType = "islamic-tbla";
 221         break;
 222     case UMALQURA:
 223         sType = "islamic-umalqura";
 224         break;
 225     default:
 226         U_ASSERT(false); // out of range
 227         sType = "islamic";  // "islamic" is used as the generic type
 228         break;
 229     }
 230     return sType;
 231 }
 232
 233 Calendar* IslamicCalendar::clone() const {
 234     return new IslamicCalendar(*this);
 235 }
 236
 237 IslamicCalendar::IslamicCalendar(const Locale& aLocale, UErrorCode& success, ECalculationType type)
 238 :   Calendar(TimeZone::createDefault(), aLocale, success),
 239 cType(type)
 240 {
 241     setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
 242 }
 243
 244 IslamicCalendar::IslamicCalendar(const IslamicCalendar& other) : Calendar(other), cType(other.cType) {
 245 }
 246
 247 IslamicCalendar::~IslamicCalendar()
 248 {
 249 }
 250
 251 void IslamicCalendar::setCalculationType(ECalculationType type, UErrorCode &status)
 252 {
 253     if (cType != type) {
 254         // The fields of the calendar will become invalid, because the calendar
 255         // rules are different
 256         UDate m = getTimeInMillis(status);
 257         cType = type;
 258         clear();
 259         setTimeInMillis(m, status);
 260     }
 261 }
 262
 263 /**
 264 * Returns <code>true</code> if this object is using the fixed-cycle civil
 265 * calendar, or <code>false</code> if using the religious, astronomical
 266 * calendar.
 267 * @draft ICU 2.4
 268 */
 269 UBool IslamicCalendar::isCivil() {
 270     return (cType == CIVIL);
 271 }
 272
 273 //-------------------------------------------------------------------------
 274 // Minimum / Maximum access functions
 275 //-------------------------------------------------------------------------
 276
 277 // Note: Current IslamicCalendar implementation does not work
 278 // well with negative years.
 279
 280 // TODO: In some cases the current ICU Islamic calendar implementation shows
 281 // a month as having 31 days. Since date parsing now uses range checks based
 282 // on the table below, we need to change the range for last day of month to
 283 // include 31 as a workaround until the implementation is fixed.
 284 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
 285     // Minimum  Greatest    Least  Maximum
 286     //           Minimum  Maximum
 287     {        0,        0,        0,        0}, // ERA
 288     {        1,        1,  5000000,  5000000}, // YEAR
 289     {        0,        0,       11,       11}, // MONTH
 290     {        1,        1,       50,       51}, // WEEK_OF_YEAR
 291     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
 292     {        1,        1,       29,       31}, // DAY_OF_MONTH - 31 to workaround for cal implementation bug, should be 30
 293     {        1,        1,      354,      355}, // DAY_OF_YEAR
 294     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
 295     {       -1,       -1,        5,        5}, // DAY_OF_WEEK_IN_MONTH
 296     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
 297     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
 298     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
 299     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
 300     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
 301     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
 302     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
 303     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
 304     {        1,        1,  5000000,  5000000}, // YEAR_WOY
 305     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
 306     {        1,        1,  5000000,  5000000}, // EXTENDED_YEAR
 307     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
 308     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
 309     {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
 310 };
 311
 312 /**
 313 * @draft ICU 2.4
 314 */
 315 int32_t IslamicCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
 316     return LIMITS[field][limitType];
 317 }
 318
 319 //-------------------------------------------------------------------------
 320 // Assorted calculation utilities
 321 //
 322
 323 // we could compress this down more if we need to
 324 static const int8_t umAlQuraYrStartEstimateFix[] = {
 325      0,  0, -1,  0, -1,  0,  0,  0,  0,  0, // 1300..
 326     -1,  0,  0,  0,  0,  0,  0,  0, -1,  0, // 1310..
 327      1,  0,  1,  1,  0,  0,  0,  0,  1,  0, // 1320..
 328      0,  0,  0,  0,  0,  0,  1,  0,  0,  0, // 1330..
 329      0,  0,  1,  0,  0, -1, -1,  0,  0,  0, // 1340..
 330      1,  0,  0, -1,  0,  0,  0,  1,  1,  0, // 1350..
 331      0,  0,  0,  0,  0,  0,  0, -1,  0,  0, // 1360..
 332      0,  1,  1,  0,  0, -1,  0,  1,  0,  1, // 1370..
 333      1,  0,  0, -1,  0,  1,  0,  0,  0, -1, // 1380..
 334      0,  1,  0,  1,  0,  0,  0, -1,  0,  0, // 1390..
 335      0,  0, -1, -1,  0, -1,  0,  1,  0,  0, // 1400..
 336      0, -1,  0,  0,  0,  1,  0,  0,  0,  0, // 1410..
 337      0,  1,  0,  0, -1, -1,  0,  0,  0,  1, // 1420..
 338      0,  0, -1, -1,  0, -1,  0,  0, -1, -1, // 1430..
 339      0, -1,  0, -1,  0,  0, -1, -1,  0,  0, // 1440..
 340      0,  0,  0,  0, -1,  0,  1,  0,  1,  1, // 1450..
 341      0,  0, -1,  0,  1,  0,  0,  0,  0,  0, // 1460..
 342      1,  0,  1,  0,  0,  0, -1,  0,  1,  0, // 1470..
 343      0, -1, -1,  0,  0,  0,  1,  0,  0,  0, // 1480..
 344      0,  0,  0,  0,  1,  0,  0,  0,  0,  0, // 1490..
 345      1,  0,  0, -1,  0,  0,  0,  1,  1,  0, // 1500..
 346      0, -1,  0,  1,  0,  1,  1,  0,  0,  0, // 1510..
 347      0,  1,  0,  0,  0, -1,  0,  0,  0,  1, // 1520..
 348      0,  0,  0, -1,  0,  0,  0,  0,  0, -1, // 1530..
 349      0, -1,  0,  1,  0,  0,  0, -1,  0,  1, // 1540..
 350      0,  1,  0,  0,  0,  0,  0,  1,  0,  0, // 1550..
 351     -1,  0,  0,  0,  0,  1,  0,  0,  0, -1, // 1560..
 352      0,  0,  0,  0, -1, -1,  0, -1,  0,  1, // 1570..
 353      0,  0, -1, -1,  0,  0,  1,  1,  0,  0, // 1580..
 354     -1,  0,  0,  0,  0,  1,  0,  0,  0,  0, // 1590..
 355      1 // 1600
 356 };
 357
 358 /**
 359 * Determine whether a year is a leap year in the Islamic civil calendar
 360 */
 361 UBool IslamicCalendar::civilLeapYear(int32_t year)
 362 {
 363     return (14 + 11 * year) % 30 < 11;
 364 }
 365
 366 /**
 367 * Return the day # on which the given year starts.  Days are counted
 368 * from the Hijri epoch, origin 0.
 369 */
 370 int32_t IslamicCalendar::yearStart(int32_t year) const{
 371     if (cType == CIVIL || cType == TBLA ||
 372         (cType == UMALQURA && (year < UMALQURA_YEAR_START || year > UMALQURA_YEAR_END)))
 373     {
 374         return (year-1)*354 + ClockMath::floorDivide((3+11*year),30);
 375     } else if(cType==ASTRONOMICAL){
 376         return trueMonthStart(12*(year-1));
 377     } else {
 378         year -= UMALQURA_YEAR_START;
 379         // rounded least-squares fit of the dates previously calculated from UMALQURA_MONTHLENGTH iteration
 380         int32_t yrStartLinearEstimate = (int32_t)((354.36720 * (double)year) + 460322.05 + 0.5);
 381         // need a slight correction to some
 382         return yrStartLinearEstimate + umAlQuraYrStartEstimateFix[year];
 383     }
 384 }
 385
 386 /**
 387 * Return the day # on which the given month starts.  Days are counted
 388 * from the Hijri epoch, origin 0.
 389 *
 390 * @param year  The hijri year
 391 * @param month The hijri month, 0-based (assumed to be in range 0..11)
 392 */
 393 int32_t IslamicCalendar::monthStart(int32_t year, int32_t month) const {
 394     if (cType == CIVIL || cType == TBLA) {
 395         // This does not handle months out of the range 0..11
 396         return (int32_t)uprv_ceil(29.5*month)
 397             + (year-1)*354 + (int32_t)ClockMath::floorDivide((3+11*year),30);
 398     } else if(cType==ASTRONOMICAL){
 399         return trueMonthStart(12*(year-1) + month);
 400     } else {
 401         int32_t ms = yearStart(year);
 402         for(int i=0; i< month; i++){
 403             ms+= handleGetMonthLength(year, i);
 404         }
 405         return ms;
 406     }
 407 }
 408
 409 /**
 410 * Find the day number on which a particular month of the true/lunar
 411 * Islamic calendar starts.
 412 *
 413 * @param month The month in question, origin 0 from the Hijri epoch
 414 *
 415 * @return The day number on which the given month starts.
 416 */
 417 int32_t IslamicCalendar::trueMonthStart(int32_t month) const
 418 {
 419     UErrorCode status = U_ZERO_ERROR;
 420     int32_t start = CalendarCache::get(&gMonthCache, month, status);
 421
 422     if (start==0) {
 423         // Make a guess at when the month started, using the average length
 424         UDate origin = HIJRA_MILLIS
 425             + uprv_floor(month * CalendarAstronomer::SYNODIC_MONTH) * kOneDay;
 426
 427         // moonAge will fail due to memory allocation error
 428         double age = moonAge(origin, status);
 429         if (U_FAILURE(status)) {
 430             goto trueMonthStartEnd;
 431         }
 432
 433         if (age >= 0) {
 434             // The month has already started
 435             do {
 436                 origin -= kOneDay;
 437                 age = moonAge(origin, status);
 438                 if (U_FAILURE(status)) {
 439                     goto trueMonthStartEnd;
 440                 }
 441             } while (age >= 0);
 442         }
 443         else {
 444             // Preceding month has not ended yet.
 445             do {
 446                 origin += kOneDay;
 447                 age = moonAge(origin, status);
 448                 if (U_FAILURE(status)) {
 449                     goto trueMonthStartEnd;
 450                 }
 451             } while (age < 0);
 452         }
 453         start = (int32_t)ClockMath::floorDivide((origin - HIJRA_MILLIS), (double)kOneDay) + 1;
 454         CalendarCache::put(&gMonthCache, month, start, status);
 455     }
 456 trueMonthStartEnd :
 457     if(U_FAILURE(status)) {
 458         start = 0;
 459     }
 460     return start;
 461 }
 462
 463 /**
 464 * Return the "age" of the moon at the given time; this is the difference
 465 * in ecliptic latitude between the moon and the sun.  This method simply
 466 * calls CalendarAstronomer.moonAge, converts to degrees,
 467 * and adjusts the result to be in the range [-180, 180].
 468 *
 469 * @param time  The time at which the moon's age is desired,
 470 *              in millis since 1/1/1970.
 471 */
 472 double IslamicCalendar::moonAge(UDate time, UErrorCode &status)
 473 {
 474     double age = 0;
 475
 476     umtx_lock(&astroLock);
 477     if(gIslamicCalendarAstro == NULL) {
 478         gIslamicCalendarAstro = new CalendarAstronomer();
 479         if (gIslamicCalendarAstro == NULL) {
 480             status = U_MEMORY_ALLOCATION_ERROR;
 481             return age;
 482         }
 483         ucln_i18n_registerCleanup(UCLN_I18N_ISLAMIC_CALENDAR, calendar_islamic_cleanup);
 484     }
 485     gIslamicCalendarAstro->setTime(time);
 486     age = gIslamicCalendarAstro->getMoonAge();
 487     umtx_unlock(&astroLock);
 488
 489     // Convert to degrees and normalize...
 490     age = age * 180 / CalendarAstronomer::PI;
 491     if (age > 180) {
 492         age = age - 360;
 493     }
 494
 495     return age;
 496 }
 497
 498 //----------------------------------------------------------------------
 499 // Calendar framework
 500 //----------------------------------------------------------------------
 501
 502 /**
 503 * Return the length (in days) of the given month.
 504 *
 505 * @param year  The hijri year
 506 * @param year  The hijri month, 0-based
 507 * @draft ICU 2.4
 508 */
 509 int32_t IslamicCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
 510
 511     int32_t length = 0;
 512
 513     if (cType == CIVIL || cType == TBLA ||
 514         (cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) {
 515         length = 29 + (month+1) % 2;
 516         if (month == DHU_AL_HIJJAH && civilLeapYear(extendedYear)) {
 517             length++;
 518         }
 519     } else if(cType == ASTRONOMICAL){
 520         month = 12*(extendedYear-1) + month;
 521         length =  trueMonthStart(month+1) - trueMonthStart(month) ;
 522     } else {
 523         length = getUmalqura_MonthLength(extendedYear - UMALQURA_YEAR_START, month);
 524     }
 525     return length;
 526 }
 527
 528 /**
 529 * Return the number of days in the given Islamic year
 530 * @draft ICU 2.4
 531 */
 532 int32_t IslamicCalendar::handleGetYearLength(int32_t extendedYear) const {
 533     if (cType == CIVIL || cType == TBLA ||
 534         (cType == UMALQURA && (extendedYear<UMALQURA_YEAR_START || extendedYear>UMALQURA_YEAR_END)) ) {
 535         return 354 + (civilLeapYear(extendedYear) ? 1 : 0);
 536     } else if(cType == ASTRONOMICAL){
 537         int32_t month = 12*(extendedYear-1);
 538         return (trueMonthStart(month + 12) - trueMonthStart(month));
 539     } else {
 540         int len = 0;
 541         for(int i=0; i<12; i++) {
 542             len += handleGetMonthLength(extendedYear, i);
 543         }
 544         return len;
 545     }
 546 }
 547
 548 //-------------------------------------------------------------------------
 549 // Functions for converting from field values to milliseconds....
 550 //-------------------------------------------------------------------------
 551
 552 // Return JD of start of given month/year
 553 // Calendar says:
 554 // Get the Julian day of the day BEFORE the start of this year.
 555 // If useMonth is true, get the day before the start of the month.
 556 // Hence the -1
 557 /**
 558 * @draft ICU 2.4
 559 */
 560 int32_t IslamicCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */) const {
 561     // This may be called by Calendar::handleComputeJulianDay with months out of the range
 562     // 0..11. Need to handle that here since monthStart requires months in the range 0.11.
 563     if (month > 11) {
 564         eyear += (month / 12);
 565         month %= 12;
 566     } else if (month < 0) {
 567         month++;
 568         eyear += (month / 12) - 1;
 569         month = (month % 12) + 11;
 570     }
 571     return monthStart(eyear, month) + ((cType == TBLA)? ASTRONOMICAL_EPOC: CIVIL_EPOC) - 1;
 572 }
 573
 574 //-------------------------------------------------------------------------
 575 // Functions for converting from milliseconds to field values
 576 //-------------------------------------------------------------------------
 577
 578 /**
 579 * @draft ICU 2.4
 580 */
 581 int32_t IslamicCalendar::handleGetExtendedYear() {
 582     int32_t year;
 583     if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
 584         year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
 585     } else {
 586         year = internalGet(UCAL_YEAR, 1); // Default to year 1
 587     }
 588     return year;
 589 }
 590
 591 /**
 592 * Override Calendar to compute several fields specific to the Islamic
 593 * calendar system.  These are:
 594 *
 595 * <ul><li>ERA
 596 * <li>YEAR
 597 * <li>MONTH
 598 * <li>DAY_OF_MONTH
 599 * <li>DAY_OF_YEAR
 600 * <li>EXTENDED_YEAR</ul>
 601 *
 602 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
 603 * method is called. The getGregorianXxx() methods return Gregorian
 604 * calendar equivalents for the given Julian day.
 605 * @draft ICU 2.4
 606 */
 607 void IslamicCalendar::handleComputeFields(int32_t julianDay, UErrorCode &status) {
 608     int32_t year, month, dayOfMonth, dayOfYear;
 609     int32_t startDate;
 610     int32_t days = julianDay - CIVIL_EPOC;
 611
 612     if (cType == CIVIL || cType == TBLA) {
 613         if(cType == TBLA) {
 614             days = julianDay - ASTRONOMICAL_EPOC;
 615         }
 616         // Use the civil calendar approximation, which is just arithmetic
 617         year  = (int32_t)ClockMath::floorDivide(30 * (int64_t)days + 10646, (int64_t)10631);
 618         month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 );
 619         month = month<11?month:11;
 620         startDate = monthStart(year, month);
 621     } else if(cType == ASTRONOMICAL){
 622         // Guess at the number of elapsed full months since the epoch
 623         int32_t months = (int32_t)uprv_floor((double)days / CalendarAstronomer::SYNODIC_MONTH);
 624
 625         startDate = (int32_t)uprv_floor(months * CalendarAstronomer::SYNODIC_MONTH);
 626
 627         double age = moonAge(internalGetTime(), status);
 628         if (U_FAILURE(status)) {
 629             status = U_MEMORY_ALLOCATION_ERROR;
 630             return;
 631         }
 632         if ( days - startDate >= 25 && age > 0) {
 633             // If we're near the end of the month, assume next month and search backwards
 634             months++;
 635         }
 636
 637         // Find out the last time that the new moon was actually visible at this longitude
 638         // This returns midnight the night that the moon was visible at sunset.
 639         while ((startDate = trueMonthStart(months)) > days) {
 640             // If it was after the date in question, back up a month and try again
 641             months--;
 642         }
 643
 644         year = months / 12 + 1;
 645         month = months % 12;
 646     } else if(cType == UMALQURA) {
 647         int32_t umalquraStartdays = yearStart(UMALQURA_YEAR_START) ;
 648         if( days < umalquraStartdays){
 649                 //Use Civil calculation
 650                 year  = (int)ClockMath::floorDivide( (double)(30 * days + 10646) , 10631.0 );
 651                 month = (int32_t)uprv_ceil((days - 29 - yearStart(year)) / 29.5 );
 652                 month = month<11?month:11;
 653                 startDate = monthStart(year, month);
 654             }else{
 655                 int y =UMALQURA_YEAR_START-1, m =0;
 656                 long d = 1;
 657                 while(d > 0){
 658                     y++;
 659                     d = days - yearStart(y) +1;
 660                     if(d == handleGetYearLength(y)){
 661                         m=11;
 662                         break;
 663                     }else if(d < handleGetYearLength(y) ){
 664                         int monthLen = handleGetMonthLength(y, m);
 665                         m=0;
 666                         while(d > monthLen){
 667                             d -= monthLen;
 668                             m++;
 669                             monthLen = handleGetMonthLength(y, m);
 670                         }
 671                         break;
 672                     }
 673                 }
 674                 year = y;
 675                 month = m;
 676             }
 677     } else { // invalid 'civil'
 678       U_ASSERT(false); // should not get here, out of range
 679       year=month=0;
 680     }
 681
 682     dayOfMonth = (days - monthStart(year, month)) + 1;
 683
 684     // Now figure out the day of the year.
 685     dayOfYear = (days - monthStart(year, 0)) + 1;
 686
 687
 688     internalSet(UCAL_ERA, 0);
 689     internalSet(UCAL_YEAR, year);
 690     internalSet(UCAL_EXTENDED_YEAR, year);
 691     internalSet(UCAL_MONTH, month);
 692     internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
 693     internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
 694 }
 695
 696 UBool
 697 IslamicCalendar::inDaylightTime(UErrorCode& status) const
 698 {
 699     // copied from GregorianCalendar
 700     if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
 701         return FALSE;
 702
 703     // Force an update of the state of the Calendar.
 704     ((IslamicCalendar*)this)->complete(status); // cast away const
 705
 706     return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
 707 }
 708
 709 /**
 710  * The system maintains a static default century start date and Year.  They are
 711  * initialized the first time they are used.  Once the system default century date
 712  * and year are set, they do not change.
 713  */
 714 static UDate           gSystemDefaultCenturyStart       = DBL_MIN;
 715 static int32_t         gSystemDefaultCenturyStartYear   = -1;
 716 static icu::UInitOnce  gSystemDefaultCenturyInit        = U_INITONCE_INITIALIZER;
 717
 718
 719 UBool IslamicCalendar::haveDefaultCentury() const
 720 {
 721     return TRUE;
 722 }
 723
 724 UDate IslamicCalendar::defaultCenturyStart() const
 725 {
 726     // lazy-evaluate systemDefaultCenturyStart
 727     umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
 728     return gSystemDefaultCenturyStart;
 729 }
 730
 731 int32_t IslamicCalendar::defaultCenturyStartYear() const
 732 {
 733     // lazy-evaluate systemDefaultCenturyStartYear
 734     umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
 735     return gSystemDefaultCenturyStartYear;
 736 }
 737
 738
 739 U_CFUNC void U_CALLCONV
 740 IslamicCalendar::initializeSystemDefaultCentury()
 741 {
 742     // initialize systemDefaultCentury and systemDefaultCenturyYear based
 743     // on the current time.  They'll be set to 80 years before
 744     // the current time.
 745     UErrorCode status = U_ZERO_ERROR;
 746     IslamicCalendar calendar(Locale("@calendar=islamic-civil"),status);
 747     if (U_SUCCESS(status)) {
 748         calendar.setTime(Calendar::getNow(), status);
 749         calendar.add(UCAL_YEAR, -80, status);
 750
 751         gSystemDefaultCenturyStart = calendar.getTime(status);
 752         gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
 753     }
 754     // We have no recourse upon failure unless we want to propagate the failure
 755     // out.
 756 }
 757
 758
 759
 760 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IslamicCalendar)
 761
 762 U_NAMESPACE_END
 763
 764 #endif
 765