The Tor Browser: comparison intl/icu/source/i18n/gregoimp.h

--1:000000000000
+:7483f7e9ef47
+/*
+**********************************************************************
+* Copyright (c) 2003-2008, International Business Machines
+* Corporation and others.  All Rights Reserved.
+**********************************************************************
+* Author: Alan Liu
+* Created: September 2 2003
+* Since: ICU 2.8
+**********************************************************************
+*/
+#ifndef GREGOIMP_H
+#define GREGOIMP_H
+#include "unicode/utypes.h"
+#if !UCONFIG_NO_FORMATTING
+#include "unicode/ures.h"
+#include "unicode/locid.h"
+#include "putilimp.h"
+U_NAMESPACE_BEGIN
+/**
+* A utility class providing mathematical functions used by time zone
+* and calendar code.  Do not instantiate.  Formerly just named 'Math'.
+* @internal
+*/
+class ClockMath {
+public:
+/**
+* Divide two integers, returning the floor of the quotient.
+* Unlike the built-in division, this is mathematically
+* well-behaved.  E.g., <code>-1/4</code> => 0 but
+* <code>floorDivide(-1,4)</code> => -1.
+* @param numerator the numerator
+* @param denominator a divisor which must be != 0
+* @return the floor of the quotient
+*/
+static int32_t floorDivide(int32_t numerator, int32_t denominator);
+/**
+* Divide two numbers, returning the floor of the quotient.
+* Unlike the built-in division, this is mathematically
+* well-behaved.  E.g., <code>-1/4</code> => 0 but
+* <code>floorDivide(-1,4)</code> => -1.
+* @param numerator the numerator
+* @param denominator a divisor which must be != 0
+* @return the floor of the quotient
+*/
+static inline double floorDivide(double numerator, double denominator);
+/**
+* Divide two numbers, returning the floor of the quotient and
+* the modulus remainder.  Unlike the built-in division, this is
+* mathematically well-behaved.  E.g., <code>-1/4</code> => 0 and
+* <code>-1%4</code> => -1, but <code>floorDivide(-1,4)</code> =>
+* -1 with <code>remainder</code> => 3.  NOTE: If numerator is
+* too large, the returned quotient may overflow.
+* @param numerator the numerator
+* @param denominator a divisor which must be != 0
+* @param remainder output parameter to receive the
+* remainder. Unlike <code>numerator % denominator</code>, this
+* will always be non-negative, in the half-open range <code>[0,
+* |denominator|)</code>.
+* @return the floor of the quotient
+*/
+static int32_t floorDivide(double numerator, int32_t denominator,
+int32_t& remainder);
+/**
+* For a positive divisor, return the quotient and remainder
+* such that dividend = quotient*divisor + remainder and
+* 0 <= remainder < divisor.
+*
+* Works around edge-case bugs.  Handles pathological input
+* (divident >> divisor) reasonably.
+*
+* Calling with a divisor <= 0 is disallowed.
+*/
+static double floorDivide(double dividend, double divisor,
+double& remainder);
+};
+// Useful millisecond constants
+#define kOneDay    (1.0 * U_MILLIS_PER_DAY)       //  86,400,000
+#define kOneHour   (60*60*1000)
+#define kOneMinute 60000
+#define kOneSecond 1000
+#define kOneMillisecond  1
+#define kOneWeek   (7.0 * kOneDay) // 604,800,000
+// Epoch constants
+#define kJan1_1JulianDay  1721426 // January 1, year 1 (Gregorian)
+#define kEpochStartAsJulianDay  2440588 // January 1, 1970 (Gregorian)
+#define kEpochYear              1970
+#define kEarliestViableMillis  -185331720384000000.0  // minimum representable by julian day  -1e17
+#define kLatestViableMillis     185753453990400000.0  // max representable by julian day      +1e17
+/**
+* The minimum supported Julian day.  This value is equivalent to
+* MIN_MILLIS.
+*/
+#define MIN_JULIAN (-0x7F000000)
+/**
+* The minimum supported epoch milliseconds.  This value is equivalent
+* to MIN_JULIAN.
+*/
+#define MIN_MILLIS ((MIN_JULIAN - kEpochStartAsJulianDay) * kOneDay)
+/**
+* The maximum supported Julian day.  This value is equivalent to
+* MAX_MILLIS.
+*/
+#define MAX_JULIAN (+0x7F000000)
+/**
+* The maximum supported epoch milliseconds.  This value is equivalent
+* to MAX_JULIAN.
+*/
+#define MAX_MILLIS ((MAX_JULIAN - kEpochStartAsJulianDay) * kOneDay)
+/**
+* A utility class providing proleptic Gregorian calendar functions
+* used by time zone and calendar code.  Do not instantiate.
+*
+* Note:  Unlike GregorianCalendar, all computations performed by this
+* class occur in the pure proleptic GregorianCalendar.
+*/
+class Grego {
+public:
+/**
+* Return TRUE if the given year is a leap year.
+* @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
+* @return TRUE if the year is a leap year
+*/
+static inline UBool isLeapYear(int32_t year);
+/**
+* Return the number of days in the given month.
+* @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
+* @param month 0-based month, with 0==Jan
+* @return the number of days in the given month
+*/
+static inline int8_t monthLength(int32_t year, int32_t month);
+/**
+* Return the length of a previous month of the Gregorian calendar.
+* @param y the extended year
+* @param m the 0-based month number
+* @return the number of days in the month previous to the given month
+*/
+static inline int8_t previousMonthLength(int y, int m);
+/**
+* Convert a year, month, and day-of-month, given in the proleptic
+* Gregorian calendar, to 1970 epoch days.
+* @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
+* @param month 0-based month, with 0==Jan
+* @param dom 1-based day of month
+* @return the day number, with day 0 == Jan 1 1970
+*/
+static double fieldsToDay(int32_t year, int32_t month, int32_t dom);
+/**
+* Convert a 1970-epoch day number to proleptic Gregorian year,
+* month, day-of-month, and day-of-week.
+* @param day 1970-epoch day (integral value)
+* @param year output parameter to receive year
+* @param month output parameter to receive month (0-based, 0==Jan)
+* @param dom output parameter to receive day-of-month (1-based)
+* @param dow output parameter to receive day-of-week (1-based, 1==Sun)
+* @param doy output parameter to receive day-of-year (1-based)
+*/
+static void dayToFields(double day, int32_t& year, int32_t& month,
+int32_t& dom, int32_t& dow, int32_t& doy);
+/**
+* Convert a 1970-epoch day number to proleptic Gregorian year,
+* month, day-of-month, and day-of-week.
+* @param day 1970-epoch day (integral value)
+* @param year output parameter to receive year
+* @param month output parameter to receive month (0-based, 0==Jan)
+* @param dom output parameter to receive day-of-month (1-based)
+* @param dow output parameter to receive day-of-week (1-based, 1==Sun)
+*/
+static inline void dayToFields(double day, int32_t& year, int32_t& month,
+int32_t& dom, int32_t& dow);
+/**
+* Convert a 1970-epoch milliseconds to proleptic Gregorian year,
+* month, day-of-month, and day-of-week, day of year and millis-in-day.
+* @param time 1970-epoch milliseconds
+* @param year output parameter to receive year
+* @param month output parameter to receive month (0-based, 0==Jan)
+* @param dom output parameter to receive day-of-month (1-based)
+* @param dow output parameter to receive day-of-week (1-based, 1==Sun)
+* @param doy output parameter to receive day-of-year (1-based)
+* @param mid output parameter to recieve millis-in-day
+*/
+static void timeToFields(UDate time, int32_t& year, int32_t& month,
+int32_t& dom, int32_t& dow, int32_t& doy, int32_t& mid);
+/**
+* Return the day of week on the 1970-epoch day
+* @param day the 1970-epoch day (integral value)
+* @return the day of week
+*/
+static int32_t dayOfWeek(double day);
+/**
+* Returns the ordinal number for the specified day of week within the month.
+* The valid return value is 1, 2, 3, 4 or -1.
+* @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
+* @param month 0-based month, with 0==Jan
+* @param dom 1-based day of month
+* @return The ordinal number for the specified day of week within the month
+*/
+static int32_t dayOfWeekInMonth(int32_t year, int32_t month, int32_t dom);
+/**
+* Converts Julian day to time as milliseconds.
+* @param julian the given Julian day number.
+* @return time as milliseconds.
+* @internal
+*/
+static inline double julianDayToMillis(int32_t julian);
+/**
+* Converts time as milliseconds to Julian day.
+* @param millis the given milliseconds.
+* @return the Julian day number.
+* @internal
+*/
+static inline int32_t millisToJulianDay(double millis);
+/**
+* Calculates the Gregorian day shift value for an extended year.
+* @param eyear Extended year
+* @returns number of days to ADD to Julian in order to convert from J->G
+*/
+static inline int32_t gregorianShift(int32_t eyear);
+private:
+static const int16_t DAYS_BEFORE[24];
+static const int8_t MONTH_LENGTH[24];
+};
+inline double ClockMath::floorDivide(double numerator, double denominator) {
+return uprv_floor(numerator / denominator);
+}
+inline UBool Grego::isLeapYear(int32_t year) {
+// year&0x3 == year%4
+return ((year&0x3) == 0) && ((year%100 != 0) || (year%400 == 0));
+}
+inline int8_t
+Grego::monthLength(int32_t year, int32_t month) {
+return MONTH_LENGTH[month + (isLeapYear(year) ? 12 : 0)];
+}
+inline int8_t
+Grego::previousMonthLength(int y, int m) {
+return (m > 0) ? monthLength(y, m-1) : 31;
+}
+inline void Grego::dayToFields(double day, int32_t& year, int32_t& month,
+int32_t& dom, int32_t& dow) {
+int32_t doy_unused;
+dayToFields(day,year,month,dom,dow,doy_unused);
+}
+inline double Grego::julianDayToMillis(int32_t julian)
+{
+return (julian - kEpochStartAsJulianDay) * kOneDay;
+}
+inline int32_t Grego::millisToJulianDay(double millis) {
+return (int32_t) (kEpochStartAsJulianDay + ClockMath::floorDivide(millis, (double)kOneDay));
+}
+inline int32_t Grego::gregorianShift(int32_t eyear) {
+int32_t y = eyear-1;
+int32_t gregShift = ClockMath::floorDivide(y, 400) - ClockMath::floorDivide(y, 100) + 2;
+return gregShift;
+}
+/**
+* This utility class provides convenient access to the data needed for a calendar.
+* @internal ICU 3.0
+*/
+class CalendarData : public UMemory {
+public:
+/**
+* Construct a CalendarData from the given locale.
+* @param loc locale to use. The 'calendar' keyword will be ignored.
+* @param type calendar type. NULL indicates the gregorian calendar.
+* No default lookup is done.
+* @param status error code
+*/
+CalendarData(const Locale& loc, const char *type, UErrorCode& status);
+/**
+* Load data for calendar. Note, this object owns the resources, do NOT call ures_close()!
+* The ResourceBundle C++ API should NOT be used because it is too slow for a low level API.
+*
+* @param key Resource key to data
+* @param status Error Status
+* @internal
+*/
+UResourceBundle* getByKey(const char *key, UErrorCode& status);
+/**
+* Load data for calendar. Note, this object owns the resources, do NOT call ures_close()!
+* There is an implicit key of 'format'
+* data is located in:   "calendar/key/format/subKey"
+* for example,  calendar/dayNames/format/abbreviated
+* The ResourceBundle C++ API should NOT be used because it is too slow for a low level API.
+*
+* @param key Resource key to data
+* @param subKey Resource key to data
+* @param status Error Status
+* @internal
+*/
+UResourceBundle* getByKey2(const char *key, const char *subKey, UErrorCode& status);
+/**
+* Load data for calendar. Note, this object owns the resources, do NOT call ures_close()!
+* data is located in:   "calendar/key/contextKey/subKey"
+* for example,  calendar/dayNames/standalone/narrow
+* The ResourceBundle C++ API should NOT be used because it is too slow for a low level API.
+*
+* @param key Resource key to data
+* @param contextKey Resource key to data
+* @param subKey Resource key to data
+* @param status Error Status
+* @internal
+*/
+UResourceBundle* getByKey3(const char *key, const char *contextKey, const char *subKey, UErrorCode& status);
+~CalendarData();
+private:
+void initData(const char *locale, const char *type, UErrorCode& status);
+UResourceBundle *fFillin;
+UResourceBundle *fOtherFillin;
+UResourceBundle *fBundle;
+UResourceBundle *fFallback;
+CalendarData(); // Not implemented.
+};
+U_NAMESPACE_END
+#endif // !UCONFIG_NO_FORMATTING
+#endif // GREGOIMP_H
+//eof

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comparison: intl/icu/source/i18n/gregoimp.h

intl/icu/source/i18n/gregoimp.h