470 lines
19 KiB
C++
470 lines
19 KiB
C++
#include "./datetime.h"
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#include "../conversion/stringbuilder.h"
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#include "../conversion/stringconversion.h"
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#include <iomanip>
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#include <sstream>
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#include <stdexcept>
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using namespace std;
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namespace CppUtilities {
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const int DateTime::m_daysPerYear = 365;
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const int DateTime::m_daysPer4Years = 1461;
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const int DateTime::m_daysPer100Years = 36524;
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const int DateTime::m_daysPer400Years = 146097;
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const int DateTime::m_daysTo1601 = 584388;
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const int DateTime::m_daysTo1899 = 693593;
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const int DateTime::m_daysTo10000 = 3652059;
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const int DateTime::m_daysToMonth365[13] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
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const int DateTime::m_daysToMonth366[13] = { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 };
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const int DateTime::m_daysInMonth365[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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const int DateTime::m_daysInMonth366[12] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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template <typename num1, typename num2, typename num3> constexpr bool inRangeInclMax(num1 val, num2 min, num3 max)
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{
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return (val) >= (min) && (val) <= (max);
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}
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template <typename num1, typename num2, typename num3> constexpr bool inRangeExclMax(num1 val, num2 min, num3 max)
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{
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return (val) >= (min) && (val) < (max);
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}
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/*!
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* \class DateTime
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* \brief Represents an instant in time, typically expressed as a date and time of day.
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* \remarks
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* - Time values are measured in 100-nanosecond units called ticks,
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* and a particular date is the number of ticks since 12:00 midnight, January 1,
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* 0001 A.D. (C.E.) in the Gregorian Calendar (excluding ticks that would be added by leap seconds).
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* - There is no time zone information associated. You need to keep track of the used time zone separately. That can
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* be done by keeping an additional TimeSpan around which represents the delta to GMT or by simply using GMT everywhere
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* in the program.
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* - When constructing an instance via DateTime::fromTimeStamp(), DateTime::fromChronoTimePoint() or DateTime::fromIsoStringLocal()
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* the time zone deltas are "baked into" the DateTime instance. For instance, the expression (DateTime::now() - DateTime::gmtNow())
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* returns one hour in Germany during winter time (and *not* zero although both instances represent the current time).
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* \todo
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* - Add method for parsing custom string formats.
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* - Add method for printing to custom string formats.
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* - Allow to determine the date part for each component at once to prevent multiple
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* invocations of getDatePart().
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*/
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/*!
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* \brief Constructs a new DateTime object with the local time from the specified UNIX \a timeStamp.
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*/
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DateTime DateTime::fromTimeStamp(time_t timeStamp)
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{
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if (timeStamp) {
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struct tm *const timeinfo = localtime(&timeStamp);
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return DateTime::fromDateAndTime(timeinfo->tm_year + 1900, timeinfo->tm_mon + 1, timeinfo->tm_mday, timeinfo->tm_hour, timeinfo->tm_min,
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timeinfo->tm_sec < 60 ? timeinfo->tm_sec : 59, 0);
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} else {
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return DateTime();
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}
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}
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/*!
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* \brief Parses the given C-style string as DateTime.
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* \throws Throws a ConversionException if the specified \a str does not match the expected time format.
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*
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* The expected format is something like "2012-02-29 15:34:20.033" or "2012/02/29 15:34:20.033". The
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* delimiters '-', ':' and '/' are exchangeable.
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*
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* \sa DateTime::fromIsoString()
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*/
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DateTime DateTime::fromString(const char *str)
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{
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int values[6] = { 0 };
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int *const dayIndex = values + 2;
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int *const secondsIndex = values + 5;
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int *valueIndex = values;
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int *const valuesEnd = values + 7;
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double millisecondsFact = 100.0, milliseconds = 0.0;
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for (const char *strIndex = str;; ++strIndex) {
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const char c = *strIndex;
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if (c <= '9' && c >= '0') {
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if (valueIndex > secondsIndex) {
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milliseconds += (c - '0') * millisecondsFact;
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millisecondsFact /= 10;
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} else {
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Detail::raiseAndAdd(*valueIndex, 10, c);
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}
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} else if ((c == '-' || c == ':' || c == '/') || (c == '.' && (valueIndex == secondsIndex))
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|| ((c == ' ' || c == 'T') && (valueIndex == dayIndex))) {
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if (++valueIndex == valuesEnd) {
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break; // just ignore further values for now
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}
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} else if (c == '\0') {
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break;
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} else {
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throw ConversionException(argsToString("Unexpected character \"", c, '\"'));
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}
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}
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return DateTime::fromDateAndTime(values[0], values[1], *dayIndex, values[3], values[4], *secondsIndex, milliseconds);
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}
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/*!
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* \brief Parses the specified ISO date time denotation provided as C-style string.
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* \returns Returns a pair where the first value is the parsed date time and the second value
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* the time zone designator (a time span which can be subtracted from the first value to get the UTC time).
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* \remarks
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* - Parsing durations and time intervals is *not* supported.
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* - Truncated representations are *not* supported.
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* - Standardised extensions (ISO 8601-2:2019) are *not* supported.
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* \sa https://en.wikipedia.org/wiki/ISO_8601
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*/
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std::pair<DateTime, TimeSpan> DateTime::fromIsoString(const char *str)
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{
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int values[9] = { 0 };
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int *const yearIndex = values + 0;
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int *const monthIndex = values + 1;
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int *const dayIndex = values + 2;
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int *const hourIndex = values + 3;
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int *const secondsIndex = values + 5;
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int *const miliSecondsIndex = values + 6;
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int *const deltaHourIndex = values + 7;
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int *const valuesEnd = values + 9;
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int *valueIndex = values;
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unsigned int remainingDigits = 4;
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bool deltaNegative = false;
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double millisecondsFact = 100.0, milliseconds = 0.0;
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for (const char *strIndex = str;; ++strIndex) {
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const char c = *strIndex;
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if (c <= '9' && c >= '0') {
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if (valueIndex == miliSecondsIndex) {
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milliseconds += (c - '0') * millisecondsFact;
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millisecondsFact /= 10;
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} else {
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if (!remainingDigits) {
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if (++valueIndex == miliSecondsIndex || valueIndex >= valuesEnd) {
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throw ConversionException("Max. number of digits exceeded");
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}
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remainingDigits = 2;
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}
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*valueIndex *= 10;
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*valueIndex += c - '0';
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remainingDigits -= 1;
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}
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} else if (c == 'T') {
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if (++valueIndex != hourIndex) {
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throw ConversionException("\"T\" expected before hour");
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}
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remainingDigits = 2;
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} else if (c == '-') {
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if (valueIndex < dayIndex) {
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++valueIndex;
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} else if (++valueIndex >= secondsIndex) {
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valueIndex = deltaHourIndex;
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deltaNegative = true;
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} else {
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throw ConversionException("Unexpected \"-\" after day");
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}
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remainingDigits = 2;
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} else if (c == '.') {
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if (valueIndex != secondsIndex) {
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throw ConversionException("Unexpected \".\"");
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} else {
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++valueIndex;
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}
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} else if (c == ':') {
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if (valueIndex < hourIndex) {
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throw ConversionException("Unexpected \":\" before hour");
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} else if (valueIndex == secondsIndex) {
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throw ConversionException("Unexpected \":\" after second");
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} else {
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++valueIndex;
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}
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remainingDigits = 2;
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} else if ((c == '+') && (++valueIndex >= secondsIndex)) {
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valueIndex = deltaHourIndex;
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deltaNegative = false;
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remainingDigits = 2;
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} else if ((c == 'Z') && (++valueIndex >= secondsIndex)) {
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valueIndex = deltaHourIndex + 2;
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remainingDigits = 2;
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} else if (c == '\0') {
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break;
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} else {
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throw ConversionException(argsToString("Unexpected \"", c, '\"'));
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}
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}
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auto delta = TimeSpan::fromMinutes(*deltaHourIndex * 60 + values[8]);
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if (deltaNegative) {
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delta = TimeSpan(-delta.totalTicks());
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}
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if (valueIndex < monthIndex && !*monthIndex) {
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*monthIndex = 1;
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}
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if (valueIndex < dayIndex && !*dayIndex) {
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*dayIndex = 1;
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}
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return make_pair(DateTime::fromDateAndTime(*yearIndex, *monthIndex, *dayIndex, *hourIndex, values[4], *secondsIndex, milliseconds), delta);
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}
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/*!
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* \brief Returns the string representation of the current instance using the specified \a format.
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* \remarks If \a noMilliseconds is true the date will be rounded to full seconds.
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* \sa toIsoString() for ISO format
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*/
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void DateTime::toString(string &result, DateTimeOutputFormat format, bool noMilliseconds) const
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{
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if (format == DateTimeOutputFormat::Iso) {
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result = toIsoString();
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return;
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}
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stringstream s(stringstream::in | stringstream::out);
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s << setfill('0');
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if (format == DateTimeOutputFormat::IsoOmittingDefaultComponents) {
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constexpr auto dateDelimiter = '-', timeDelimiter = ':';
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const int components[] = { year(), month(), day(), hour(), minute(), second(), millisecond(), microsecond(), nanosecond() };
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const int *const firstTimeComponent = components + 3;
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const int *const firstFractionalComponent = components + 6;
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const int *const lastComponent = components + 8;
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const int *componentsEnd = noMilliseconds ? firstFractionalComponent : lastComponent + 1;
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for (const int *i = componentsEnd - 1; i > components; --i) {
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if (i >= firstTimeComponent && *i == 0) {
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componentsEnd = i;
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} else if (i < firstTimeComponent && *i == 1) {
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componentsEnd = i;
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}
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}
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for (const int *i = components; i != componentsEnd; ++i) {
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if (i == firstTimeComponent) {
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s << 'T';
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} else if (i == firstFractionalComponent) {
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s << '.';
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}
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if (i == components) {
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s << setw(4) << *i;
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} else if (i < firstFractionalComponent) {
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if (i < firstTimeComponent) {
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s << dateDelimiter;
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} else if (i > firstTimeComponent) {
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s << timeDelimiter;
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}
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s << setw(2) << *i;
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} else if (i < lastComponent) {
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s << setw(3) << *i;
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} else {
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s << *i / TimeSpan::nanosecondsPerTick;
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}
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}
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result = s.str();
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return;
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}
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if (format == DateTimeOutputFormat::DateTimeAndWeekday || format == DateTimeOutputFormat::DateTimeAndShortWeekday)
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s << printDayOfWeek(dayOfWeek(), format == DateTimeOutputFormat::DateTimeAndShortWeekday) << ' ';
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if (format == DateTimeOutputFormat::DateOnly || format == DateTimeOutputFormat::DateAndTime || format == DateTimeOutputFormat::DateTimeAndWeekday
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|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
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s << setw(4) << year() << '-' << setw(2) << month() << '-' << setw(2) << day();
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if (format == DateTimeOutputFormat::DateAndTime || format == DateTimeOutputFormat::DateTimeAndWeekday
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|| format == DateTimeOutputFormat::DateTimeAndShortWeekday)
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s << " ";
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if (format == DateTimeOutputFormat::TimeOnly || format == DateTimeOutputFormat::DateAndTime || format == DateTimeOutputFormat::DateTimeAndWeekday
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|| format == DateTimeOutputFormat::DateTimeAndShortWeekday) {
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s << setw(2) << hour() << ':' << setw(2) << minute() << ':' << setw(2) << second();
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int ms = millisecond();
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if (!noMilliseconds && ms > 0) {
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s << '.' << setw(3) << ms;
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}
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}
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result = s.str();
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}
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/*!
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* \brief Returns the string representation of the current instance in the ISO format with custom delimiters,
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* eg. 2016/08/29T21-32-31.588539814+02:00 with '/' as \a dateDelimiter and '-' as \a timeDelimiter.
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*/
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string DateTime::toIsoStringWithCustomDelimiters(TimeSpan timeZoneDelta, char dateDelimiter, char timeDelimiter, char timeZoneDelimiter) const
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{
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stringstream s(stringstream::in | stringstream::out);
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s << setfill('0');
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s << setw(4) << year() << dateDelimiter << setw(2) << month() << dateDelimiter << setw(2) << day() << 'T' << setw(2) << hour() << timeDelimiter
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<< setw(2) << minute() << timeDelimiter << setw(2) << second();
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const int milli(millisecond());
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const int micro(microsecond());
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const int nano(nanosecond());
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if (milli || micro || nano) {
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s << '.' << setw(3) << milli;
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if (micro || nano) {
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s << setw(3) << micro;
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if (nano) {
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s << nano / TimeSpan::nanosecondsPerTick;
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}
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}
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}
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if (!timeZoneDelta.isNull()) {
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if (timeZoneDelta.isNegative()) {
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s << '-';
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timeZoneDelta = TimeSpan(-timeZoneDelta.totalTicks());
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} else {
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s << '+';
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}
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s << setw(2) << timeZoneDelta.hours() << timeZoneDelimiter << setw(2) << timeZoneDelta.minutes();
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}
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return s.str();
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}
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/*!
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* \brief Returns the string representation of the current instance in the ISO format,
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* eg. 2016-08-29T21:32:31.588539814+02:00.
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*/
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string DateTime::toIsoString(TimeSpan timeZoneDelta) const
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{
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return toIsoStringWithCustomDelimiters(timeZoneDelta);
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}
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/*!
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* \brief Returns the string representation as C-style string for the given day of week.
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*
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* If \a abbreviation is true, only the first three letters of the string will
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* be returned.
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* \sa DayOfWeek
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*/
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const char *DateTime::printDayOfWeek(DayOfWeek dayOfWeek, bool abbreviation)
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{
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if (abbreviation) {
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switch (dayOfWeek) {
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case DayOfWeek::Monday:
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return "Mon";
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case DayOfWeek::Tuesday:
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return "Tue";
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case DayOfWeek::Wednesday:
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return "Wed";
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case DayOfWeek::Thursday:
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return "Thu";
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case DayOfWeek::Friday:
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return "Fri";
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case DayOfWeek::Saturday:
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return "Sat";
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case DayOfWeek::Sunday:
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return "Sun";
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}
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} else {
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switch (dayOfWeek) {
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case DayOfWeek::Monday:
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return "Monday";
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case DayOfWeek::Tuesday:
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return "Tuesday";
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case DayOfWeek::Wednesday:
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return "Wednesday";
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case DayOfWeek::Thursday:
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return "Thursday";
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case DayOfWeek::Friday:
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return "Friday";
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case DayOfWeek::Saturday:
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return "Saturday";
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case DayOfWeek::Sunday:
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return "Sunday";
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}
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}
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return "";
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}
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#if defined(PLATFORM_UNIX) && !defined(PLATFORM_MAC)
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/*!
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* \brief Returns a DateTime object that is set to the current date and time on this computer, expressed as the GMT time.
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* \remarks Only available under UNIX-like systems supporting clock_gettime().
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*/
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DateTime DateTime::exactGmtNow()
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{
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struct timespec t;
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clock_gettime(CLOCK_REALTIME, &t);
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return DateTime(DateTime::unixEpochStart().totalTicks() + static_cast<std::uint64_t>(t.tv_sec) * TimeSpan::ticksPerSecond
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+ static_cast<std::uint64_t>(t.tv_nsec) / 100);
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}
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#endif
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/*!
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* \brief Converts the given date expressed in \a year, \a month and \a day to ticks.
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*/
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std::uint64_t DateTime::dateToTicks(int year, int month, int day)
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{
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if (!inRangeInclMax(year, 1, 9999)) {
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throw ConversionException("year is out of range");
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}
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if (!inRangeInclMax(month, 1, 12)) {
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throw ConversionException("month is out of range");
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}
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const auto *const daysToMonth = reinterpret_cast<const int *>(isLeapYear(year) ? m_daysToMonth366 : m_daysToMonth365);
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const int passedMonth = month - 1;
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if (!inRangeInclMax(day, 1, daysToMonth[month] - daysToMonth[passedMonth])) {
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throw ConversionException("day is out of range");
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}
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const auto passedYears = static_cast<unsigned int>(year - 1);
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const auto passedDays = static_cast<unsigned int>(day - 1);
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return (passedYears * m_daysPerYear + passedYears / 4 - passedYears / 100 + passedYears / 400
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+ static_cast<unsigned int>(daysToMonth[passedMonth]) + passedDays)
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* TimeSpan::ticksPerDay;
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}
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/*!
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* \brief Converts the given time expressed in \a hour, \a minute, \a second and \a millisecond to ticks.
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*/
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std::uint64_t DateTime::timeToTicks(int hour, int minute, int second, double millisecond)
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{
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if (!inRangeExclMax(hour, 0, 24)) {
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throw ConversionException("hour is out of range");
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}
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if (!inRangeExclMax(minute, 0, 60)) {
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throw ConversionException("minute is out of range");
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}
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if (!inRangeExclMax(second, 0, 60)) {
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throw ConversionException("second is out of range");
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}
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if (!inRangeExclMax(millisecond, 0.0, 1000.0)) {
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throw ConversionException("millisecond is out of range");
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}
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return static_cast<std::uint64_t>(hour * TimeSpan::ticksPerHour) + static_cast<std::uint64_t>(minute * TimeSpan::ticksPerMinute)
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+ static_cast<std::uint64_t>(second * TimeSpan::ticksPerSecond) + static_cast<std::uint64_t>(millisecond * TimeSpan::ticksPerMillisecond);
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}
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/*!
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* \brief Returns the specified date part.
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* \sa DatePart
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*/
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int DateTime::getDatePart(DatePart part) const
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{
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const auto fullDays = static_cast<int>(m_ticks / TimeSpan::ticksPerDay);
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const auto full400YearBlocks = fullDays / m_daysPer400Years;
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const auto daysMinusFull400YearBlocks = fullDays - full400YearBlocks * m_daysPer400Years;
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auto full100YearBlocks = daysMinusFull400YearBlocks / m_daysPer100Years;
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if (full100YearBlocks == 4) {
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full100YearBlocks = 3;
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}
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const auto daysMinusFull100YearBlocks = daysMinusFull400YearBlocks - full100YearBlocks * m_daysPer100Years;
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const auto full4YearBlocks = daysMinusFull100YearBlocks / m_daysPer4Years;
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const auto daysMinusFull4YearBlocks = daysMinusFull100YearBlocks - full4YearBlocks * m_daysPer4Years;
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auto full1YearBlocks = daysMinusFull4YearBlocks / m_daysPerYear;
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if (full1YearBlocks == 4) {
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full1YearBlocks = 3;
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}
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if (part == DatePart::Year) {
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return full400YearBlocks * 400 + full100YearBlocks * 100 + full4YearBlocks * 4 + full1YearBlocks + 1;
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}
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const auto restDays = daysMinusFull4YearBlocks - full1YearBlocks * m_daysPerYear;
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if (part == DatePart::DayOfYear) { // day
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return restDays + 1;
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}
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const auto *const daysToMonth = (full1YearBlocks == 3 && (full4YearBlocks != 24 || full100YearBlocks == 3)) ? m_daysToMonth366 : m_daysToMonth365;
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auto month = 1;
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while (restDays >= daysToMonth[month]) {
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++month;
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}
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if (part == DatePart::Month) {
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return month;
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} else if (part == DatePart::Day) {
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return restDays - daysToMonth[month - 1] + 1;
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}
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return 0;
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}
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} // namespace CppUtilities
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