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Diffstat (limited to 'deps/node/deps/icu-small/source/i18n/gregoimp.cpp')
-rw-r--r-- | deps/node/deps/icu-small/source/i18n/gregoimp.cpp | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/deps/node/deps/icu-small/source/i18n/gregoimp.cpp b/deps/node/deps/icu-small/source/i18n/gregoimp.cpp deleted file mode 100644 index cc31e274..00000000 --- a/deps/node/deps/icu-small/source/i18n/gregoimp.cpp +++ /dev/null @@ -1,166 +0,0 @@ -// © 2016 and later: Unicode, Inc. and others. -// License & terms of use: http://www.unicode.org/copyright.html -/* - ********************************************************************** - * Copyright (c) 2003-2008, International Business Machines - * Corporation and others. All Rights Reserved. - ********************************************************************** - * Author: Alan Liu - * Created: September 2 2003 - * Since: ICU 2.8 - ********************************************************************** - */ - -#include "gregoimp.h" - -#if !UCONFIG_NO_FORMATTING - -#include "unicode/ucal.h" -#include "uresimp.h" -#include "cstring.h" -#include "uassert.h" - -U_NAMESPACE_BEGIN - -int32_t ClockMath::floorDivide(int32_t numerator, int32_t denominator) { - return (numerator >= 0) ? - numerator / denominator : ((numerator + 1) / denominator) - 1; -} - -int64_t ClockMath::floorDivide(int64_t numerator, int64_t denominator) { - return (numerator >= 0) ? - numerator / denominator : ((numerator + 1) / denominator) - 1; -} - -int32_t ClockMath::floorDivide(double numerator, int32_t denominator, - int32_t& remainder) { - double quotient; - quotient = uprv_floor(numerator / denominator); - remainder = (int32_t) (numerator - (quotient * denominator)); - return (int32_t) quotient; -} - -double ClockMath::floorDivide(double dividend, double divisor, - double& remainder) { - // Only designed to work for positive divisors - U_ASSERT(divisor > 0); - double quotient = floorDivide(dividend, divisor); - remainder = dividend - (quotient * divisor); - // N.B. For certain large dividends, on certain platforms, there - // is a bug such that the quotient is off by one. If you doubt - // this to be true, set a breakpoint below and run cintltst. - if (remainder < 0 || remainder >= divisor) { - // E.g. 6.7317038241449352e+022 / 86400000.0 is wrong on my - // machine (too high by one). 4.1792057231752762e+024 / - // 86400000.0 is wrong the other way (too low). - double q = quotient; - quotient += (remainder < 0) ? -1 : +1; - if (q == quotient) { - // For quotients > ~2^53, we won't be able to add or - // subtract one, since the LSB of the mantissa will be > - // 2^0; that is, the exponent (base 2) will be larger than - // the length, in bits, of the mantissa. In that case, we - // can't give a correct answer, so we set the remainder to - // zero. This has the desired effect of making extreme - // values give back an approximate answer rather than - // crashing. For example, UDate values above a ~10^25 - // might all have a time of midnight. - remainder = 0; - } else { - remainder = dividend - (quotient * divisor); - } - } - U_ASSERT(0 <= remainder && remainder < divisor); - return quotient; -} - -const int32_t JULIAN_1_CE = 1721426; // January 1, 1 CE Gregorian -const int32_t JULIAN_1970_CE = 2440588; // January 1, 1970 CE Gregorian - -const int16_t Grego::DAYS_BEFORE[24] = - {0,31,59,90,120,151,181,212,243,273,304,334, - 0,31,60,91,121,152,182,213,244,274,305,335}; - -const int8_t Grego::MONTH_LENGTH[24] = - {31,28,31,30,31,30,31,31,30,31,30,31, - 31,29,31,30,31,30,31,31,30,31,30,31}; - -double Grego::fieldsToDay(int32_t year, int32_t month, int32_t dom) { - - int32_t y = year - 1; - - double julian = 365 * y + ClockMath::floorDivide(y, 4) + (JULIAN_1_CE - 3) + // Julian cal - ClockMath::floorDivide(y, 400) - ClockMath::floorDivide(y, 100) + 2 + // => Gregorian cal - DAYS_BEFORE[month + (isLeapYear(year) ? 12 : 0)] + dom; // => month/dom - - return julian - JULIAN_1970_CE; // JD => epoch day -} - -void Grego::dayToFields(double day, int32_t& year, int32_t& month, - int32_t& dom, int32_t& dow, int32_t& doy) { - - // Convert from 1970 CE epoch to 1 CE epoch (Gregorian calendar) - day += JULIAN_1970_CE - JULIAN_1_CE; - - // Convert from the day number to the multiple radix - // representation. We use 400-year, 100-year, and 4-year cycles. - // For example, the 4-year cycle has 4 years + 1 leap day; giving - // 1461 == 365*4 + 1 days. - int32_t n400 = ClockMath::floorDivide(day, 146097, doy); // 400-year cycle length - int32_t n100 = ClockMath::floorDivide(doy, 36524, doy); // 100-year cycle length - int32_t n4 = ClockMath::floorDivide(doy, 1461, doy); // 4-year cycle length - int32_t n1 = ClockMath::floorDivide(doy, 365, doy); - year = 400*n400 + 100*n100 + 4*n4 + n1; - if (n100 == 4 || n1 == 4) { - doy = 365; // Dec 31 at end of 4- or 400-year cycle - } else { - ++year; - } - - UBool isLeap = isLeapYear(year); - - // Gregorian day zero is a Monday. - dow = (int32_t) uprv_fmod(day + 1, 7); - dow += (dow < 0) ? (UCAL_SUNDAY + 7) : UCAL_SUNDAY; - - // Common Julian/Gregorian calculation - int32_t correction = 0; - int32_t march1 = isLeap ? 60 : 59; // zero-based DOY for March 1 - if (doy >= march1) { - correction = isLeap ? 1 : 2; - } - month = (12 * (doy + correction) + 6) / 367; // zero-based month - dom = doy - DAYS_BEFORE[month + (isLeap ? 12 : 0)] + 1; // one-based DOM - doy++; // one-based doy -} - -void Grego::timeToFields(UDate time, int32_t& year, int32_t& month, - int32_t& dom, int32_t& dow, int32_t& doy, int32_t& mid) { - double millisInDay; - double day = ClockMath::floorDivide((double)time, (double)U_MILLIS_PER_DAY, millisInDay); - mid = (int32_t)millisInDay; - dayToFields(day, year, month, dom, dow, doy); -} - -int32_t Grego::dayOfWeek(double day) { - int32_t dow; - ClockMath::floorDivide(day + UCAL_THURSDAY, 7, dow); - return (dow == 0) ? UCAL_SATURDAY : dow; -} - -int32_t Grego::dayOfWeekInMonth(int32_t year, int32_t month, int32_t dom) { - int32_t weekInMonth = (dom + 6)/7; - if (weekInMonth == 4) { - if (dom + 7 > monthLength(year, month)) { - weekInMonth = -1; - } - } else if (weekInMonth == 5) { - weekInMonth = -1; - } - return weekInMonth; -} - -U_NAMESPACE_END - -#endif -//eof |