1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 * Copyright (C) 2003-2014, International Business Machines Corporation
5 * and others. All Rights Reserved.
6 ******************************************************************************
7 *
8 * File INDIANCAL.CPP
9 *****************************************************************************
10 */
11
12 #include "indiancal.h"
13 #include <stdlib.h>
14 #if !UCONFIG_NO_FORMATTING
15
16 #include "mutex.h"
17 #include <float.h>
18 #include "gregoimp.h" // Math
19 #include "uhash.h"
20
21 // Debugging
22 #ifdef U_DEBUG_INDIANCAL
23 #include <stdio.h>
24 #include <stdarg.h>
25
26 #endif
27
28 U_NAMESPACE_BEGIN
29
30 // Implementation of the IndianCalendar class
31
32 //-------------------------------------------------------------------------
33 // Constructors...
34 //-------------------------------------------------------------------------
35
36
clone() const37 IndianCalendar* IndianCalendar::clone() const {
38 return new IndianCalendar(*this);
39 }
40
IndianCalendar(const Locale & aLocale,UErrorCode & success)41 IndianCalendar::IndianCalendar(const Locale& aLocale, UErrorCode& success)
42 : Calendar(TimeZone::forLocaleOrDefault(aLocale), aLocale, success)
43 {
44 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
45 }
46
IndianCalendar(const IndianCalendar & other)47 IndianCalendar::IndianCalendar(const IndianCalendar& other) : Calendar(other) {
48 }
49
~IndianCalendar()50 IndianCalendar::~IndianCalendar()
51 {
52 }
getType() const53 const char *IndianCalendar::getType() const {
54 return "indian";
55 }
56
57 static const int32_t LIMITS[UCAL_FIELD_COUNT][4] = {
58 // Minimum Greatest Least Maximum
59 // Minimum Maximum
60 { 0, 0, 0, 0}, // ERA
61 { -5000000, -5000000, 5000000, 5000000}, // YEAR
62 { 0, 0, 11, 11}, // MONTH
63 { 1, 1, 52, 53}, // WEEK_OF_YEAR
64 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
65 { 1, 1, 30, 31}, // DAY_OF_MONTH
66 { 1, 1, 365, 366}, // DAY_OF_YEAR
67 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
68 { -1, -1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
69 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
70 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
71 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
72 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
73 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
74 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
75 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
76 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
77 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
78 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
79 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
80 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
81 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
82 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
83 { 0, 0, 11, 11}, // ORDINAL_MONTH
84 };
85
86 static const int32_t INDIAN_ERA_START = 78;
87 static const int32_t INDIAN_YEAR_START = 80;
88
handleGetLimit(UCalendarDateFields field,ELimitType limitType) const89 int32_t IndianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
90 return LIMITS[field][limitType];
91 }
92
93 /*
94 * Determine whether the given gregorian year is a Leap year
95 */
isGregorianLeap(int32_t year)96 static UBool isGregorianLeap(int32_t year)
97 {
98 return Grego::isLeapYear(year);
99 }
100
101 //----------------------------------------------------------------------
102 // Calendar framework
103 //----------------------------------------------------------------------
104
105 /*
106 * Return the length (in days) of the given month.
107 *
108 * @param eyear The year in Saka Era
109 * @param month The month(0-based) in Indian calendar
110 */
handleGetMonthLength(int32_t eyear,int32_t month,UErrorCode &) const111 int32_t IndianCalendar::handleGetMonthLength(int32_t eyear, int32_t month, UErrorCode& /* status */) const {
112 if (month < 0 || month > 11) {
113 eyear += ClockMath::floorDivide(month, 12, &month);
114 }
115
116 if (isGregorianLeap(eyear + INDIAN_ERA_START) && month == 0) {
117 return 31;
118 }
119
120 if (month >= 1 && month <= 5) {
121 return 31;
122 }
123
124 return 30;
125 }
126
127 /*
128 * Return the number of days in the given Indian year
129 *
130 * @param eyear The year in Saka Era.
131 */
handleGetYearLength(int32_t eyear) const132 int32_t IndianCalendar::handleGetYearLength(int32_t eyear) const {
133 return isGregorianLeap(eyear + INDIAN_ERA_START) ? 366 : 365;
134 }
135 /*
136 * Returns the Julian Day corresponding to gregorian date
137 *
138 * @param year The Gregorian year
139 * @param month The month in Gregorian Year, 0 based.
140 * @param date The date in Gregorian day in month
141 */
gregorianToJD(int32_t year,int32_t month,int32_t date)142 static double gregorianToJD(int32_t year, int32_t month, int32_t date) {
143 return Grego::fieldsToDay(year, month, date) + kEpochStartAsJulianDay - 0.5;
144 }
145
146 /*
147 * Returns the Gregorian Date corresponding to a given Julian Day
148 * Month is 0 based.
149 * @param jd The Julian Day
150 */
jdToGregorian(double jd,int32_t gregorianDate[3])151 static int32_t* jdToGregorian(double jd, int32_t gregorianDate[3]) {
152 int32_t gdow;
153 Grego::dayToFields(jd - kEpochStartAsJulianDay,
154 gregorianDate[0], gregorianDate[1], gregorianDate[2], gdow);
155 return gregorianDate;
156 }
157
158
159 //-------------------------------------------------------------------------
160 // Functions for converting from field values to milliseconds....
161 //-------------------------------------------------------------------------
IndianToJD(int32_t year,int32_t month,int32_t date)162 static double IndianToJD(int32_t year, int32_t month, int32_t date) {
163 int32_t leapMonth, gyear, m;
164 double start, jd;
165
166 gyear = year + INDIAN_ERA_START;
167
168
169 if(isGregorianLeap(gyear)) {
170 leapMonth = 31;
171 start = gregorianToJD(gyear, 2 /* The third month in 0 based month */, 21);
172 }
173 else {
174 leapMonth = 30;
175 start = gregorianToJD(gyear, 2 /* The third month in 0 based month */, 22);
176 }
177
178 if (month == 1) {
179 jd = start + (date - 1);
180 } else {
181 jd = start + leapMonth;
182 m = month - 2;
183
184 //m = Math.min(m, 5);
185 if (m > 5) {
186 m = 5;
187 }
188
189 jd += m * 31;
190
191 if (month >= 8) {
192 m = month - 7;
193 jd += m * 30;
194 }
195 jd += date - 1;
196 }
197
198 return jd;
199 }
200
201 /*
202 * Return JD of start of given month/year of Indian Calendar
203 * @param eyear The year in Indian Calendar measured from Saka Era (78 AD).
204 * @param month The month in Indian calendar
205 */
handleComputeMonthStart(int32_t eyear,int32_t month,UBool,UErrorCode & status) const206 int64_t IndianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /* useMonth */, UErrorCode& status) const {
207 if (U_FAILURE(status)) {
208 return 0;
209 }
210
211 //month is 0 based; converting it to 1-based
212 int32_t imonth;
213
214 // If the month is out of range, adjust it into range, and adjust the extended year accordingly
215 if (month < 0 || month > 11) {
216 if (uprv_add32_overflow(eyear, ClockMath::floorDivide(month, 12, &month), &eyear)) {
217 status = U_ILLEGAL_ARGUMENT_ERROR;
218 return 0;
219 }
220 }
221
222 if(month == 12){
223 imonth = 1;
224 } else {
225 imonth = month + 1;
226 }
227
228 int64_t jd = IndianToJD(eyear ,imonth, 1);
229
230 return jd;
231 }
232
233 //-------------------------------------------------------------------------
234 // Functions for converting from milliseconds to field values
235 //-------------------------------------------------------------------------
236
handleGetExtendedYear(UErrorCode & status)237 int32_t IndianCalendar::handleGetExtendedYear(UErrorCode& status) {
238 if (U_FAILURE(status)) {
239 return 0;
240 }
241 int32_t year;
242
243 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
244 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
245 } else {
246 year = internalGet(UCAL_YEAR, 1); // Default to year 1
247 }
248
249 return year;
250 }
251
252 /*
253 * Override Calendar to compute several fields specific to the Indian
254 * calendar system. These are:
255 *
256 * <ul><li>ERA
257 * <li>YEAR
258 * <li>MONTH
259 * <li>DAY_OF_MONTH
260 * <li>EXTENDED_YEAR</ul>
261 *
262 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
263 * method is called. The getGregorianXxx() methods return Gregorian
264 * calendar equivalents for the given Julian day.
265 */
handleComputeFields(int32_t julianDay,UErrorCode &)266 void IndianCalendar::handleComputeFields(int32_t julianDay, UErrorCode& /* status */) {
267 double jdAtStartOfGregYear;
268 int32_t leapMonth, IndianYear, yday, IndianMonth, IndianDayOfMonth, mday;
269 int32_t gregorianYear; // Stores gregorian date corresponding to Julian day;
270 int32_t gd[3];
271
272 gregorianYear = jdToGregorian(julianDay, gd)[0]; // Gregorian date for Julian day
273 IndianYear = gregorianYear - INDIAN_ERA_START; // Year in Saka era
274 jdAtStartOfGregYear = gregorianToJD(gregorianYear, 0, 1); // JD at start of Gregorian year
275 yday = (int32_t)(julianDay - jdAtStartOfGregYear); // Day number in Gregorian year (starting from 0)
276
277 if (yday < INDIAN_YEAR_START) {
278 // Day is at the end of the preceding Saka year
279 IndianYear -= 1;
280 leapMonth = isGregorianLeap(gregorianYear - 1) ? 31 : 30; // Days in leapMonth this year, previous Gregorian year
281 yday += leapMonth + (31 * 5) + (30 * 3) + 10;
282 } else {
283 leapMonth = isGregorianLeap(gregorianYear) ? 31 : 30; // Days in leapMonth this year
284 yday -= INDIAN_YEAR_START;
285 }
286
287 if (yday < leapMonth) {
288 IndianMonth = 0;
289 IndianDayOfMonth = yday + 1;
290 } else {
291 mday = yday - leapMonth;
292 if (mday < (31 * 5)) {
293 IndianMonth = (int32_t)uprv_floor(mday / 31) + 1;
294 IndianDayOfMonth = (mday % 31) + 1;
295 } else {
296 mday -= 31 * 5;
297 IndianMonth = (int32_t)uprv_floor(mday / 30) + 6;
298 IndianDayOfMonth = (mday % 30) + 1;
299 }
300 }
301
302 internalSet(UCAL_ERA, 0);
303 internalSet(UCAL_EXTENDED_YEAR, IndianYear);
304 internalSet(UCAL_YEAR, IndianYear);
305 internalSet(UCAL_MONTH, IndianMonth);
306 internalSet(UCAL_ORDINAL_MONTH, IndianMonth);
307 internalSet(UCAL_DAY_OF_MONTH, IndianDayOfMonth);
308 internalSet(UCAL_DAY_OF_YEAR, yday + 1); // yday is 0-based
309 }
310
311 constexpr uint32_t kIndianRelatedYearDiff = 79;
312
getRelatedYear(UErrorCode & status) const313 int32_t IndianCalendar::getRelatedYear(UErrorCode &status) const
314 {
315 int32_t year = get(UCAL_EXTENDED_YEAR, status);
316 if (U_FAILURE(status)) {
317 return 0;
318 }
319 if (uprv_add32_overflow(year, kIndianRelatedYearDiff, &year)) {
320 status = U_ILLEGAL_ARGUMENT_ERROR;
321 return 0;
322 }
323 return year;
324 }
325
setRelatedYear(int32_t year)326 void IndianCalendar::setRelatedYear(int32_t year)
327 {
328 // set extended year
329 set(UCAL_EXTENDED_YEAR, year - kIndianRelatedYearDiff);
330 }
331
332 IMPL_SYSTEM_DEFAULT_CENTURY(IndianCalendar, "@calendar=indian")
333
334 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndianCalendar)
335
336 U_NAMESPACE_END
337
338 #endif
339
340