The Tor Browser: intl/icu/source/i18n/dangical.cpp@fc2d59ddac77

     1 /*

     2  ******************************************************************************

     3  * Copyright (C) 2013, International Business Machines Corporation

     4  * and others. All Rights Reserved.

     5  ******************************************************************************

     6  *

     7  * File DANGICAL.CPP

     8  *****************************************************************************

     9  */

    11 #include "chnsecal.h"

    12 #include "dangical.h"

    14 #if !UCONFIG_NO_FORMATTING

    16 #include "gregoimp.h" // Math

    17 #include "uassert.h"

    18 #include "ucln_in.h"

    19 #include "umutex.h"

    20 #include "unicode/rbtz.h"

    21 #include "unicode/tzrule.h"

    23 // --- The cache --

    24 static icu::TimeZone *gDangiCalendarZoneAstroCalc = NULL;

    25 static icu::UInitOnce gDangiCalendarInitOnce = U_INITONCE_INITIALIZER;

    27 /**

    28  * The start year of the Korean traditional calendar (Dan-gi) is the inaugural

    29  * year of Dan-gun (BC 2333).

    30  */

    31 static const int32_t DANGI_EPOCH_YEAR = -2332; // Gregorian year

    33 U_CDECL_BEGIN

    34 static UBool calendar_dangi_cleanup(void) {

    35     if (gDangiCalendarZoneAstroCalc) {

    36         delete gDangiCalendarZoneAstroCalc;

    37         gDangiCalendarZoneAstroCalc = NULL;

    38     }

    39     gDangiCalendarInitOnce.reset();

    40     return TRUE;

    41 }

    42 U_CDECL_END

    44 U_NAMESPACE_BEGIN

    46 // Implementation of the DangiCalendar class

    48 //-------------------------------------------------------------------------

    49 // Constructors...

    50 //-------------------------------------------------------------------------

    52 DangiCalendar::DangiCalendar(const Locale& aLocale, UErrorCode& success)

    53 :   ChineseCalendar(aLocale, DANGI_EPOCH_YEAR, getDangiCalZoneAstroCalc(), success)

    54 {

    55 }

    57 DangiCalendar::DangiCalendar (const DangiCalendar& other)

    58 : ChineseCalendar(other)

    59 {

    60 }

    62 DangiCalendar::~DangiCalendar()

    63 {

    64 }

    66 Calendar*

    67 DangiCalendar::clone() const

    68 {

    69     return new DangiCalendar(*this);

    70 }

    72 const char *DangiCalendar::getType() const {

    73     return "dangi";

    74 }

    76 /**

    77  * The time zone used for performing astronomical computations for

    78  * Dangi calendar. In Korea various timezones have been used historically

    79  * (cf. http://www.math.snu.ac.kr/~kye/others/lunar.html):

    80  *

    81  *            - 1908/04/01: GMT+8

    82  * 1908/04/01 - 1911/12/31: GMT+8.5

    83  * 1912/01/01 - 1954/03/20: GMT+9

    84  * 1954/03/21 - 1961/08/09: GMT+8.5

    85  * 1961/08/10 -           : GMT+9

    86  *

    87  * Note that, in 1908-1911, the government did not apply the timezone change

    88  * but used GMT+8. In addition, 1954-1961's timezone change does not affect

    89  * the lunar date calculation. Therefore, the following simpler rule works:

    90  *

    91  * -1911: GMT+8

    92  * 1912-: GMT+9

    93  *

    94  * Unfortunately, our astronomer's approximation doesn't agree with the

    95  * references (http://www.math.snu.ac.kr/~kye/others/lunar.html and

    96  * http://astro.kasi.re.kr/Life/ConvertSolarLunarForm.aspx?MenuID=115)

    97  * in 1897/7/30. So the following ad hoc fix is used here:

    98  *

    99  *     -1896: GMT+8

   100  *      1897: GMT+7

   101  * 1898-1911: GMT+8

   102  * 1912-    : GMT+9

   103  */

   104 static void U_CALLCONV initDangiCalZoneAstroCalc(void) {

   105     U_ASSERT(gDangiCalendarZoneAstroCalc == NULL);

   106     const UDate millis1897[] = { (UDate)((1897 - 1970) * 365 * kOneDay) }; // some days of error is not a problem here

   107     const UDate millis1898[] = { (UDate)((1898 - 1970) * 365 * kOneDay) }; // some days of error is not a problem here

   108     const UDate millis1912[] = { (UDate)((1912 - 1970) * 365 * kOneDay) }; // this doesn't create an issue for 1911/12/20

   109     InitialTimeZoneRule* initialTimeZone = new InitialTimeZoneRule(UNICODE_STRING_SIMPLE("GMT+8"), 8*kOneHour, 0);

   110     TimeZoneRule* rule1897 = new TimeArrayTimeZoneRule(UNICODE_STRING_SIMPLE("Korean 1897"), 7*kOneHour, 0, millis1897, 1, DateTimeRule::STANDARD_TIME);

   111     TimeZoneRule* rule1898to1911 = new TimeArrayTimeZoneRule(UNICODE_STRING_SIMPLE("Korean 1898-1911"), 8*kOneHour, 0, millis1898, 1, DateTimeRule::STANDARD_TIME);

   112     TimeZoneRule* ruleFrom1912 = new TimeArrayTimeZoneRule(UNICODE_STRING_SIMPLE("Korean 1912-"), 9*kOneHour, 0, millis1912, 1, DateTimeRule::STANDARD_TIME);

   113     UErrorCode status = U_ZERO_ERROR;

   114     RuleBasedTimeZone* dangiCalZoneAstroCalc = new RuleBasedTimeZone(UNICODE_STRING_SIMPLE("KOREA_ZONE"), initialTimeZone); // adopts initialTimeZone

   115     dangiCalZoneAstroCalc->addTransitionRule(rule1897, status); // adopts rule1897

   116     dangiCalZoneAstroCalc->addTransitionRule(rule1898to1911, status);

   117     dangiCalZoneAstroCalc->addTransitionRule(ruleFrom1912, status);

   118     dangiCalZoneAstroCalc->complete(status);

   119     if (U_SUCCESS(status)) {

   120         gDangiCalendarZoneAstroCalc = dangiCalZoneAstroCalc;

   121     } else {

   122         delete dangiCalZoneAstroCalc;

   123         gDangiCalendarZoneAstroCalc = NULL;

   124     }

   125     ucln_i18n_registerCleanup(UCLN_I18N_DANGI_CALENDAR, calendar_dangi_cleanup);

   126 }

   128 const TimeZone* DangiCalendar::getDangiCalZoneAstroCalc(void) const {

   129     umtx_initOnce(gDangiCalendarInitOnce, &initDangiCalZoneAstroCalc);

   130     return gDangiCalendarZoneAstroCalc;

   131 }

   134 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(DangiCalendar)

   136 U_NAMESPACE_END

   138 #endif

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intl/icu/source/i18n/dangical.cpp@fc2d59ddac77

intl/icu/source/i18n/dangical.cpp