1 /*
2 ******************************************************************************
3 * Copyright (C) 2003-2008, International Business Machines Corporation
4 * and others. All Rights Reserved.
5 ******************************************************************************
6 *
7 * File PERSNCAL.CPP
8 *
9 * Modification History:
10 *
11 * Date Name Description
12 * 9/23/2003 mehran posted to icu-design
13 *****************************************************************************
14 */
15
16 #include "persncal.h"
17
18 #if !UCONFIG_NO_FORMATTING
19
20 #include "umutex.h"
21 #include <float.h>
22
23 static const int8_t monthDays[] = { 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29 };
24
25 static int32_t
jalali_to_julian(int year,int month,int day)26 jalali_to_julian(int year, int month, int day)
27 {
28 int32_t daysNo=0;
29 int i;
30
31 year = year -475+2820;
32 month -= 1;
33
34 daysNo=(year/2820)*1029983;
35 year=year % 2820;
36
37 daysNo+=(year/128)* 46751;
38 if((year/128)>21)
39 {
40 daysNo-=46751;
41 year=(year%128)+128;
42 }
43 else
44 year=year%128;
45
46 if(year>=29)
47 {
48 year-=29;
49 daysNo+=10592;
50 }
51
52 if(year>=66)
53 {
54 year-=66;
55 daysNo+=24106;
56 }
57 else if( year>=33)
58 {
59 daysNo+=(year/33)* 12053;
60 year=year%33;
61 }
62
63 if (year >= 5)
64 {
65 daysNo += 1826;
66 year -=5;
67 }
68 else if (year == 4)
69 {
70 daysNo += 1460;
71 year -=4;
72 }
73
74 daysNo += 1461 * (year/4);
75 year %= 4;
76 daysNo += 365 * year;
77
78 for (i = 0; i < month; i++) {
79 daysNo += monthDays[i];
80 }
81
82 daysNo += day;
83
84 return daysNo-856493;
85 }
86
julian_to_jalali(int32_t daysNo,int * h_y,int * h_m,int * h_d)87 static void julian_to_jalali (int32_t daysNo, int *h_y, int *h_m, int *h_d)
88 {
89 int year=0, month=0, day=0,scalarDays=0;
90 int i;
91
92 daysNo+=856493;
93 scalarDays=daysNo;
94 year=(daysNo/1029983)*2820;
95 daysNo=daysNo%1029983;
96
97 if((daysNo/46751)<=21)
98 {
99 year+=(daysNo/46751)* 128;
100 daysNo=daysNo%46751;
101 }
102 else
103 {
104 year+=(daysNo/46751)* 128;
105 daysNo=daysNo%46751;
106 year-=128;
107 daysNo+=46751;
108 }
109
110 if (daysNo >= 10592)
111 {
112 year+= 29;
113 daysNo -= 10592;
114 }
115
116 if(daysNo>=24106)
117 {
118 daysNo-=24106;
119 year+=66;
120 }
121
122 if(daysNo>=12053)
123 {
124 daysNo-=12053;
125 year+=33;
126 }
127
128
129 if (daysNo >= 1826)
130 {
131 year+= 5;
132 daysNo -= 1826;
133 }
134 else if (daysNo > 1095)
135 {
136 year+= 3;
137 daysNo -= 1095;
138
139 }
140
141 year +=(4 * (daysNo/1461));
142 daysNo %= 1461;
143
144 if (daysNo == 0)
145 {
146 year -= 1;
147 daysNo = 366;
148 }
149 else
150 {
151 year += daysNo/365;
152 daysNo = daysNo % 365;
153 if (daysNo == 0)
154 {
155 year -= 1;
156 daysNo = 365;
157 }
158
159 }
160
161 for (i = 0; i < 11 && daysNo > monthDays[i]; ++i) {
162 daysNo -= monthDays[i];
163 }
164
165 month = i + 1;
166
167 day = daysNo;
168
169 *h_d = day;
170 *h_m = month;
171 *h_y = year-2345;
172 }
173
174 U_NAMESPACE_BEGIN
175
176 // Implementation of the PersianCalendar class
177
178 //-------------------------------------------------------------------------
179 // Constructors...
180 //-------------------------------------------------------------------------
181
getType() const182 const char *PersianCalendar::getType() const {
183 return "persian";
184 }
185
clone() const186 Calendar* PersianCalendar::clone() const {
187 return new PersianCalendar(*this);
188 }
189
PersianCalendar(const Locale & aLocale,UErrorCode & success)190 PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
191 : Calendar(TimeZone::createDefault(), aLocale, success)
192 {
193 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
194 }
195
PersianCalendar(const PersianCalendar & other)196 PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
197 }
198
~PersianCalendar()199 PersianCalendar::~PersianCalendar()
200 {
201 }
202
203 //-------------------------------------------------------------------------
204 // Minimum / Maximum access functions
205 //-------------------------------------------------------------------------
206
207 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
208 // Minimum Greatest Least Maximum
209 // Minimum Maximum
210 { 0, 0, 0, 0}, // ERA
211 { -5000000, -5000000, 5000000, 5000000}, // YEAR
212 { 0, 0, 11, 11}, // MONTH
213 { 1, 1, 52, 53}, // WEEK_OF_YEAR
214 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
215 { 1, 1, 29, 31}, // DAY_OF_MONTH
216 { 1, 1, 365, 366}, // DAY_OF_YEAR
217 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
218 { 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
219 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
220 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
221 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
222 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
223 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
224 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
225 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
226 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
227 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
228 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
229 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
230 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
231 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
232 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
233 };
234 static const int32_t MONTH_COUNT[12][4] = {
235 //len len2 st st2
236 { 31, 31, 0, 0 }, // Farvardin
237 { 31, 31, 31, 31 }, // Ordibehesht
238 { 31, 31, 62, 62 }, // Khordad
239 { 31, 31, 93, 93 }, // Tir
240 { 31, 31, 124, 124 }, // Mordad
241 { 31, 31, 155, 155 }, // Shahrivar
242 { 30, 30, 186, 186 }, // Mehr
243 { 30, 30, 216, 216 }, // Aban
244 { 30, 30, 246, 246 }, // Azar
245 { 30, 30, 276, 276 }, // Dey
246 { 30, 30, 306, 306 }, // Bahman
247 { 29, 30, 336, 336 } // Esfand
248 // len length of month
249 // len2 length of month in a leap year
250 // st days in year before start of month
251 // st2 days in year before month in leap year
252 };
253
handleGetLimit(UCalendarDateFields field,ELimitType limitType) const254 int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
255 return LIMITS[field][limitType];
256 }
257
258 //-------------------------------------------------------------------------
259 // Assorted calculation utilities
260 //
261
262 /**
263 * Determine whether a year is a leap year in the Persian calendar
264 */
isLeapYear(int32_t year)265 UBool PersianCalendar::isLeapYear(int32_t year)
266 {
267 return jalali_to_julian(year+1,1,1)-jalali_to_julian(year,1,1) == 366;
268 }
269
270 /**
271 * Return the day # on which the given year starts. Days are counted
272 * from the Hijri epoch, origin 0.
273 */
yearStart(int32_t year)274 int32_t PersianCalendar::yearStart(int32_t year) {
275 return handleComputeMonthStart(year,1,FALSE);
276 }
277
278 /**
279 * Return the day # on which the given month starts. Days are counted
280 * from the Hijri epoch, origin 0.
281 *
282 * @param year The hijri shamsi year
283 * @param year The hijri shamsi month, 0-based
284 */
monthStart(int32_t year,int32_t month) const285 int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
286 return handleComputeMonthStart(year,month,FALSE);
287 }
288
289 //----------------------------------------------------------------------
290 // Calendar framework
291 //----------------------------------------------------------------------
292
293 /**
294 * Return the length (in days) of the given month.
295 *
296 * @param year The hijri shamsi year
297 * @param year The hijri shamsi month, 0-based
298 */
handleGetMonthLength(int32_t extendedYear,int32_t month) const299 int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
300 return MONTH_COUNT[month][PersianCalendar::isLeapYear(extendedYear)?1:0];
301 }
302
303 /**
304 * Return the number of days in the given Persian year
305 */
handleGetYearLength(int32_t extendedYear) const306 int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
307 return 365 + (PersianCalendar::isLeapYear(extendedYear) ? 1 : 0);
308 }
309
310 //-------------------------------------------------------------------------
311 // Functions for converting from field values to milliseconds....
312 //-------------------------------------------------------------------------
313
314 // Return JD of start of given month/year
handleComputeMonthStart(int32_t eyear,int32_t month,UBool useMonth) const315 int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool useMonth) const {
316 // If the month is out of range, adjust it into range, and
317 // modify the extended year value accordingly.
318 if (month < 0 || month > 11) {
319 eyear += month / 12;
320 month = month % 12;
321 }
322 return jalali_to_julian(eyear,(useMonth?month+1:1),1)-1+1947955;
323 }
324
325 //-------------------------------------------------------------------------
326 // Functions for converting from milliseconds to field values
327 //-------------------------------------------------------------------------
328
handleGetExtendedYear()329 int32_t PersianCalendar::handleGetExtendedYear() {
330 int32_t year;
331 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
332 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
333 } else {
334 year = internalGet(UCAL_YEAR, 1); // Default to year 1
335 }
336 return year;
337 }
338
339 /**
340 * Override Calendar to compute several fields specific to the Persian
341 * calendar system. These are:
342 *
343 * <ul><li>ERA
344 * <li>YEAR
345 * <li>MONTH
346 * <li>DAY_OF_MONTH
347 * <li>DAY_OF_YEAR
348 * <li>EXTENDED_YEAR</ul>
349 *
350 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
351 * method is called. The getGregorianXxx() methods return Gregorian
352 * calendar equivalents for the given Julian day.
353 */
handleComputeFields(int32_t julianDay,UErrorCode &)354 void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
355 int jy,jm,jd;
356 julian_to_jalali(julianDay-1947955,&jy,&jm,&jd);
357 internalSet(UCAL_ERA, 0);
358 internalSet(UCAL_YEAR, jy);
359 internalSet(UCAL_EXTENDED_YEAR, jy);
360 internalSet(UCAL_MONTH, jm-1);
361 internalSet(UCAL_DAY_OF_MONTH, jd);
362 internalSet(UCAL_DAY_OF_YEAR, jd + MONTH_COUNT[jm-1][2]);
363 }
364
365 UBool
inDaylightTime(UErrorCode & status) const366 PersianCalendar::inDaylightTime(UErrorCode& status) const
367 {
368 // copied from GregorianCalendar
369 if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
370 return FALSE;
371
372 // Force an update of the state of the Calendar.
373 ((PersianCalendar*)this)->complete(status); // cast away const
374
375 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
376 }
377
378 // default century
379 const UDate PersianCalendar::fgSystemDefaultCentury = DBL_MIN;
380 const int32_t PersianCalendar::fgSystemDefaultCenturyYear = -1;
381
382 UDate PersianCalendar::fgSystemDefaultCenturyStart = DBL_MIN;
383 int32_t PersianCalendar::fgSystemDefaultCenturyStartYear = -1;
384
haveDefaultCentury() const385 UBool PersianCalendar::haveDefaultCentury() const
386 {
387 return TRUE;
388 }
389
defaultCenturyStart() const390 UDate PersianCalendar::defaultCenturyStart() const
391 {
392 return internalGetDefaultCenturyStart();
393 }
394
defaultCenturyStartYear() const395 int32_t PersianCalendar::defaultCenturyStartYear() const
396 {
397 return internalGetDefaultCenturyStartYear();
398 }
399
400 UDate
internalGetDefaultCenturyStart() const401 PersianCalendar::internalGetDefaultCenturyStart() const
402 {
403 // lazy-evaluate systemDefaultCenturyStart
404 UBool needsUpdate;
405 UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
406
407 if (needsUpdate) {
408 initializeSystemDefaultCentury();
409 }
410
411 // use defaultCenturyStart unless it's the flag value;
412 // then use systemDefaultCenturyStart
413
414 return fgSystemDefaultCenturyStart;
415 }
416
417 int32_t
internalGetDefaultCenturyStartYear() const418 PersianCalendar::internalGetDefaultCenturyStartYear() const
419 {
420 // lazy-evaluate systemDefaultCenturyStartYear
421 UBool needsUpdate;
422 UMTX_CHECK(NULL, (fgSystemDefaultCenturyStart == fgSystemDefaultCentury), needsUpdate);
423
424 if (needsUpdate) {
425 initializeSystemDefaultCentury();
426 }
427
428 // use defaultCenturyStart unless it's the flag value;
429 // then use systemDefaultCenturyStartYear
430
431 return fgSystemDefaultCenturyStartYear;
432 }
433
434 void
initializeSystemDefaultCentury()435 PersianCalendar::initializeSystemDefaultCentury()
436 {
437 // initialize systemDefaultCentury and systemDefaultCenturyYear based
438 // on the current time. They'll be set to 80 years before
439 // the current time.
440 UErrorCode status = U_ZERO_ERROR;
441 PersianCalendar calendar(Locale("@calendar=persian"),status);
442 if (U_SUCCESS(status))
443 {
444 calendar.setTime(Calendar::getNow(), status);
445 calendar.add(UCAL_YEAR, -80, status);
446 UDate newStart = calendar.getTime(status);
447 int32_t newYear = calendar.get(UCAL_YEAR, status);
448 umtx_lock(NULL);
449 if (fgSystemDefaultCenturyStart == fgSystemDefaultCentury)
450 {
451 fgSystemDefaultCenturyStartYear = newYear;
452 fgSystemDefaultCenturyStart = newStart;
453 }
454 umtx_unlock(NULL);
455 }
456 // We have no recourse upon failure unless we want to propagate the failure
457 // out.
458 }
459
460 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
461
462 U_NAMESPACE_END
463
464 #endif
465
466