294 lines
9.8 KiB
C++
294 lines
9.8 KiB
C++
/*
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******************************************************************************
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* Copyright (C) 2003-2013, 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 PERSNCAL.CPP
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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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* 9/23/2003 mehran posted to icu-design
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* 10/1/2012 roozbeh Fixed algorithm and heavily refactored and rewrote
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* based on the implementation of Gregorian
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*****************************************************************************
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*/
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#include "persncal.h"
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#if !UCONFIG_NO_FORMATTING
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#include "umutex.h"
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#include "gregoimp.h" // Math
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#include <float.h>
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static const int16_t kPersianNumDays[]
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= {0,31,62,93,124,155,186,216,246,276,306,336}; // 0-based, for day-in-year
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static const int8_t kPersianMonthLength[]
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= {31,31,31,31,31,31,30,30,30,30,30,29}; // 0-based
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static const int8_t kPersianLeapMonthLength[]
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= {31,31,31,31,31,31,30,30,30,30,30,30}; // 0-based
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static const int32_t kPersianCalendarLimits[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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{ -5000000, -5000000, 5000000, 5000000}, // YEAR
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{ 0, 0, 11, 11}, // MONTH
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{ 1, 1, 52, 53}, // 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
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{ 1, 1, 365, 366}, // 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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{ -5000000, -5000000, 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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{ -5000000, -5000000, 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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U_NAMESPACE_BEGIN
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static const int32_t PERSIAN_EPOCH = 1948320;
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// Implementation of the PersianCalendar class
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//-------------------------------------------------------------------------
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// Constructors...
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//-------------------------------------------------------------------------
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const char *PersianCalendar::getType() const {
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return "persian";
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}
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Calendar* PersianCalendar::clone() const {
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return new PersianCalendar(*this);
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}
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PersianCalendar::PersianCalendar(const Locale& aLocale, UErrorCode& success)
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: Calendar(TimeZone::createDefault(), aLocale, success)
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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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PersianCalendar::PersianCalendar(const PersianCalendar& other) : Calendar(other) {
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}
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PersianCalendar::~PersianCalendar()
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{
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}
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//-------------------------------------------------------------------------
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// Minimum / Maximum access functions
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//-------------------------------------------------------------------------
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int32_t PersianCalendar::handleGetLimit(UCalendarDateFields field, ELimitType limitType) const {
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return kPersianCalendarLimits[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 Persian calendar
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*/
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UBool PersianCalendar::isLeapYear(int32_t year)
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{
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int32_t remainder;
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ClockMath::floorDivide(25 * year + 11, 33, remainder);
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return (remainder < 8);
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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 Persian epoch, origin 0.
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*/
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int32_t PersianCalendar::yearStart(int32_t year) {
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return handleComputeMonthStart(year,0,FALSE);
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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 Persian epoch, origin 0.
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*
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* @param year The Persian year
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* @param year The Persian month, 0-based
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*/
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int32_t PersianCalendar::monthStart(int32_t year, int32_t month) const {
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return handleComputeMonthStart(year,month,TRUE);
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}
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//----------------------------------------------------------------------
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// Calendar framework
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//----------------------------------------------------------------------
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/**
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* Return the length (in days) of the given month.
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*
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* @param year The Persian year
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* @param year The Persian month, 0-based
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*/
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int32_t PersianCalendar::handleGetMonthLength(int32_t extendedYear, int32_t month) const {
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// If the month is out of range, adjust it into range, and
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// modify the extended year value accordingly.
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if (month < 0 || month > 11) {
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extendedYear += ClockMath::floorDivide(month, 12, month);
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}
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return isLeapYear(extendedYear) ? kPersianLeapMonthLength[month] : kPersianMonthLength[month];
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}
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/**
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* Return the number of days in the given Persian year
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*/
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int32_t PersianCalendar::handleGetYearLength(int32_t extendedYear) const {
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return isLeapYear(extendedYear) ? 366 : 365;
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}
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//-------------------------------------------------------------------------
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// Functions for converting from field values to milliseconds....
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//-------------------------------------------------------------------------
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// Return JD of start of given month/year
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int32_t PersianCalendar::handleComputeMonthStart(int32_t eyear, int32_t month, UBool /*useMonth*/) const {
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// If the month is out of range, adjust it into range, and
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// modify the extended year value accordingly.
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if (month < 0 || month > 11) {
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eyear += ClockMath::floorDivide(month, 12, month);
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}
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int32_t julianDay = PERSIAN_EPOCH - 1 + 365 * (eyear - 1) + ClockMath::floorDivide(8 * eyear + 21, 33);
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if (month != 0) {
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julianDay += kPersianNumDays[month];
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}
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return julianDay;
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}
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//-------------------------------------------------------------------------
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// Functions for converting from milliseconds to field values
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//-------------------------------------------------------------------------
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int32_t PersianCalendar::handleGetExtendedYear() {
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int32_t year;
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if (newerField(UCAL_EXTENDED_YEAR, UCAL_YEAR) == UCAL_EXTENDED_YEAR) {
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year = internalGet(UCAL_EXTENDED_YEAR, 1); // Default to year 1
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} else {
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year = internalGet(UCAL_YEAR, 1); // Default to year 1
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}
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return year;
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}
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/**
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* Override Calendar to compute several fields specific to the Persian
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* calendar system. These are:
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*
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* <ul><li>ERA
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* <li>YEAR
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* <li>MONTH
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* <li>DAY_OF_MONTH
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* <li>DAY_OF_YEAR
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* <li>EXTENDED_YEAR</ul>
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*
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* The DAY_OF_WEEK and DOW_LOCAL fields are already set when this
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* method is called.
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*/
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void PersianCalendar::handleComputeFields(int32_t julianDay, UErrorCode &/*status*/) {
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int32_t year, month, dayOfMonth, dayOfYear;
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int32_t daysSinceEpoch = julianDay - PERSIAN_EPOCH;
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year = 1 + ClockMath::floorDivide(33 * daysSinceEpoch + 3, 12053);
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int32_t farvardin1 = 365 * (year - 1) + ClockMath::floorDivide(8 * year + 21, 33);
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dayOfYear = (daysSinceEpoch - farvardin1); // 0-based
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if (dayOfYear < 216) { // Compute 0-based month
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month = dayOfYear / 31;
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} else {
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month = (dayOfYear - 6) / 30;
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}
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dayOfMonth = dayOfYear - kPersianNumDays[month] + 1;
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++dayOfYear; // Make it 1-based now
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internalSet(UCAL_ERA, 0);
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internalSet(UCAL_YEAR, year);
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internalSet(UCAL_EXTENDED_YEAR, year);
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internalSet(UCAL_MONTH, month);
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internalSet(UCAL_DAY_OF_MONTH, dayOfMonth);
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internalSet(UCAL_DAY_OF_YEAR, dayOfYear);
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}
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UBool
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PersianCalendar::inDaylightTime(UErrorCode& status) const
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{
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// copied from GregorianCalendar
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if (U_FAILURE(status) || !getTimeZone().useDaylightTime())
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return FALSE;
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// Force an update of the state of the Calendar.
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((PersianCalendar*)this)->complete(status); // cast away const
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return (UBool)(U_SUCCESS(status) ? (internalGet(UCAL_DST_OFFSET) != 0) : FALSE);
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}
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// default century
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static UDate gSystemDefaultCenturyStart = DBL_MIN;
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static int32_t gSystemDefaultCenturyStartYear = -1;
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static icu::UInitOnce gSystemDefaultCenturyInit = U_INITONCE_INITIALIZER;
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UBool PersianCalendar::haveDefaultCentury() const
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{
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return TRUE;
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}
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static void U_CALLCONV initializeSystemDefaultCentury() {
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// initialize systemDefaultCentury and systemDefaultCenturyYear based
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// on the current time. They'll be set to 80 years before
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// the current time.
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UErrorCode status = U_ZERO_ERROR;
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PersianCalendar calendar(Locale("@calendar=persian"),status);
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if (U_SUCCESS(status))
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{
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calendar.setTime(Calendar::getNow(), status);
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calendar.add(UCAL_YEAR, -80, status);
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gSystemDefaultCenturyStart = calendar.getTime(status);
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gSystemDefaultCenturyStartYear = calendar.get(UCAL_YEAR, status);
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}
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// We have no recourse upon failure unless we want to propagate the failure
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// out.
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}
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UDate PersianCalendar::defaultCenturyStart() const {
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// lazy-evaluate systemDefaultCenturyStart
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umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
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return gSystemDefaultCenturyStart;
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}
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int32_t PersianCalendar::defaultCenturyStartYear() const {
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// lazy-evaluate systemDefaultCenturyStartYear
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umtx_initOnce(gSystemDefaultCenturyInit, &initializeSystemDefaultCentury);
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return gSystemDefaultCenturyStartYear;
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}
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(PersianCalendar)
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U_NAMESPACE_END
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#endif
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