1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ******************************************************************************
5 * Copyright (C) 2003-2013, International Business Machines Corporation
6 * and others. All Rights Reserved.
7 ******************************************************************************
8 *
9 * File PERSNCAL.CPP
10 *
11 * Modification History:
12 *
13 * Date Name Description
14 * 9/23/2003 mehran posted to icu-design
15 * 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote
16 * based on the implementation of Gregorian
17 *****************************************************************************
18 */
19
20 #include "persncal.h"
21
22 #if !UCONFIG_NO_FORMATTING
23
24 #include "umutex.h"
25 #include "gregoimp.h" // Math
26 #include <float.h>
27
28 static const int16_t kPersianNumDays[]
29 = {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year
30 static const int8_t kPersianMonthLength[]
31 = {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based
32 static const int8_t kPersianLeapMonthLength[]
33 = {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based
34
35 static const int32_t kPersianCalendarLimits[UCAL_FIELD_COUNT][4] = {
36 // Minimum Greatest Least Maximum
37 // Minimum Maximum
38 { 0, 0, 0, 0}, // ERA
39 { -5000000, -5000000, 5000000, 5000000}, // YEAR
40 { 0, 0, 11, 11}, // MONTH
41 { 1, 1, 52, 53}, // WEEK_OF_YEAR
42 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // WEEK_OF_MONTH
43 { 1, 1, 29, 31}, // DAY_OF_MONTH
44 { 1, 1, 365, 366}, // DAY_OF_YEAR
45 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DAY_OF_WEEK
46 { 1, 1, 5, 5}, // DAY_OF_WEEK_IN_MONTH
47 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // AM_PM
48 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR
49 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // HOUR_OF_DAY
50 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MINUTE
51 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // SECOND
52 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECOND
53 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // ZONE_OFFSET
54 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DST_OFFSET
55 { -5000000, -5000000, 5000000, 5000000}, // YEAR_WOY
56 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // DOW_LOCAL
57 { -5000000, -5000000, 5000000, 5000000}, // EXTENDED_YEAR
58 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // JULIAN_DAY
59 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // MILLISECONDS_IN_DAY
60 {/*N/A*/-1,/*N/A*/-1,/*N/A*/-1,/*N/A*/-1}, // IS_LEAP_MONTH
61 };
62
63 U_NAMESPACE_BEGIN
64
65 static const int32_t PERSIAN_EPOCH = 1948320;
66
67 // Implementation of the PersianCalendar class
68
69 //-------------------------------------------------------------------------
70 // Constructors...
71 //-------------------------------------------------------------------------
72
getType() const73 const char *PersianCalendar::getType() const {
74 return "persian";
75 }
76
clone() const77 PersianCalendar* PersianCalendar::clone() const {
78 return new PersianCalendar(*this);
79 }
80
PersianCalendar(const Locale & aLocale,UErrorCode & success)81 PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
82 : Calendar(TimeZone::forLocaleOrDefault(aLocale), aLocale, success)
83 {
84 setTimeInMillis(getNow(), success); // Call this again now that the vtable is set up properly.
85 }
86
PersianCalendar(const PersianCalendar & other)87 PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
88 }
89
~PersianCalendar()90 PersianCalendar::~PersianCalendar()
91 {
92 }
93
94 //-------------------------------------------------------------------------
95 // Minimum / Maximum access functions
96 //-------------------------------------------------------------------------
97
98
handleGetLimit(UCalendarDateFields field,ELimitType limitType) const99 int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
100 return kPersianCalendarLimits[field][limitType];
101 }
102
103 //-------------------------------------------------------------------------
104 // Assorted calculation utilities
105 //
106
107 /**
108 * Determine whether a year is a leap year in the Persian calendar
109 */
isLeapYear(int32_t year)110 UBool PersianCalendar::isLeapYear(int32_t year)
111 {
112 int32_t remainder;
113 ClockMath::floorDivide(25 * year + 11, 33, remainder);
114 return (remainder < 8);
115 }
116
117 /**
118 * Return the day # on which the given year starts. Days are counted
119 * from the Persian epoch, origin 0.
120 */
yearStart(int32_t year)121 int32_t PersianCalendar::yearStart(int32_t year) {
122 return handleComputeMonthStart(year,0,FALSE);
123 }
124
125 /**
126 * Return the day # on which the given month starts. Days are counted
127 * from the Persian epoch, origin 0.
128 *
129 * @param year The Persian year
130 * @param year The Persian month, 0-based
131 */
monthStart(int32_t year,int32_t month) const132 int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
133 return handleComputeMonthStart(year,month,TRUE);
134 }
135
136 //----------------------------------------------------------------------
137 // Calendar framework
138 //----------------------------------------------------------------------
139
140 /**
141 * Return the length (in days) of the given month.
142 *
143 * @param year The Persian year
144 * @param year The Persian month, 0-based
145 */
handleGetMonthLength(int32_t extendedYear,int32_t month) const146 int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
147 // If the month is out of range, adjust it into range, and
148 // modify the extended year value accordingly.
149 if (month < 0 || month > 11) {
150 extendedYear += ClockMath::floorDivide(month, 12, month);
151 }
152
153 return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month];
154 }
155
156 /**
157 * Return the number of days in the given Persian year
158 */
handleGetYearLength(int32_t extendedYear) const159 int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
160 return isLeapYear(extendedYear) ? 366 : 365;
161 }
162
163 //-------------------------------------------------------------------------
164 // Functions for converting from field values to milliseconds....
165 //-------------------------------------------------------------------------
166
167 // Return JD of start of given month/year
handleComputeMonthStart(int32_t eyear,int32_t month,UBool) const168 int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
169 // If the month is out of range, adjust it into range, and
170 // modify the extended year value accordingly.
171 if (month < 0 || month > 11) {
172 eyear += ClockMath::floorDivide(month, 12, month);
173 }
174
175 int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33);
176
177 if (month != 0) {
178 julianDay += kPersianNumDays[month];
179 }
180
181 return julianDay;
182 }
183
184 //-------------------------------------------------------------------------
185 // Functions for converting from milliseconds to field values
186 //-------------------------------------------------------------------------
187
handleGetExtendedYear()188 int32_t PersianCalendar::handleGetExtendedYear() {
189 int32_t year;
190 if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
191 year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
192 } else {
193 year = internalGet(UCAL_YEAR, 1); // Default to year 1
194 }
195 return year;
196 }
197
198 /**
199 * Override Calendar to compute several fields specific to the Persian
200 * calendar system. These are:
201 *
202 * <ul><li>ERA
203 * <li>YEAR
204 * <li>MONTH
205 * <li>DAY_OF_MONTH
206 * <li>DAY_OF_YEAR
207 * <li>EXTENDED_YEAR</ul>
208 *
209 * The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
210 * method is called.
211 */
handleComputeFields(int32_t julianDay,UErrorCode &)212 void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
213 int32_t year, month, dayOfMonth, dayOfYear;
214
215 int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH;
216 year = 1 + (int32_t)ClockMath::floorDivide(33 * (int64_t)daysSinceEpoch + 3, (int64_t)12053);
217
218 int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33);
219 dayOfYear = (daysSinceEpoch - farvardin1); // 0-based
220 if (dayOfYear < 216) { // Compute 0-based month
221 month = dayOfYear / 31;
222 } else {
223 month = (dayOfYear - 6) / 30;
224 }
225 dayOfMonth = dayOfYear - kPersianNumDays[month] + 1;
226 ++dayOfYear; // Make it 1-based now
227
228 internalSet(UCAL_ERA, 0);
229 internalSet(UCAL_YEAR, year);
230 internalSet(UCAL_EXTENDED_YEAR, year);
231 internalSet(UCAL_MONTH, month);
232 internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
233 internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
234 }
235
236 UBool
inDaylightTime(UErrorCode & status) const237 PersianCalendar::inDaylightTime(UErrorCode& status) const
238 {
239 // copied from GregorianCalendar
240 if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
241 return FALSE;
242
243 // Force an update of the state of the Calendar.
244 ((PersianCalendar*)this)->complete(status); // cast away const
245
246 return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
247 }
248
249 // default century
250
251 static UDate gSystemDefaultCenturyStart = DBL_MIN;
252 static int32_t gSystemDefaultCenturyStartYear = -1;
253 static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
254
haveDefaultCentury() const255 UBool PersianCalendar::haveDefaultCentury() const
256 {
257 return TRUE;
258 }
259
initializeSystemDefaultCentury()260 static void U_CALLCONV initializeSystemDefaultCentury() {
261 // initialize systemDefaultCentury and systemDefaultCenturyYear based
262 // on the current time. They'll be set to 80 years before
263 // the current time.
264 UErrorCode status = U_ZERO_ERROR;
265 PersianCalendar calendar(Locale("@calendar=persian"),status);
266 if (U_SUCCESS(status))
267 {
268 calendar.setTime(Calendar::getNow(), status);
269 calendar.add(UCAL_YEAR, -80, status);
270
271 gSystemDefaultCenturyStart = calendar.getTime(status);
272 gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
273 }
274 // We have no recourse upon failure unless we want to propagate the failure
275 // out.
276 }
277
defaultCenturyStart() const278 UDate PersianCalendar::defaultCenturyStart() const {
279 // lazy-evaluate systemDefaultCenturyStart
280 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
281 return gSystemDefaultCenturyStart;
282 }
283
defaultCenturyStartYear() const284 int32_t PersianCalendar::defaultCenturyStartYear() const {
285 // lazy-evaluate systemDefaultCenturyStartYear
286 umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
287 return gSystemDefaultCenturyStartYear;
288 }
289
290 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
291
292 U_NAMESPACE_END
293
294 #endif
295
296