186 lines
8.8 KiB
C++
186 lines
8.8 KiB
C++
//
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// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
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//
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#ifndef BOOST_LOCALE_DATE_TIME_FACET_HPP_INCLUDED
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#define BOOST_LOCALE_DATE_TIME_FACET_HPP_INCLUDED
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#include <boost/locale/config.hpp>
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#include <boost/locale/detail/facet_id.hpp>
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#include <cstdint>
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#include <locale>
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4275 4251 4231 4660)
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#endif
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namespace boost { namespace locale {
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/// \brief Namespace that contains various types for manipulation with dates
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namespace period {
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/// \brief This namespace holds a enum of various period types like era, year, month, etc..
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namespace marks {
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/// \brief the type that defines a flag that holds a period identifier
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enum period_mark {
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invalid, ///< Special invalid value, should not be used directly
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era, ///< Era i.e. AC, BC in Gregorian and Julian calendar, range [0,1]
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year, ///< Year, it is calendar specific, for example 2011 in Gregorian calendar.
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extended_year, ///< Extended year for Gregorian/Julian calendars, where 1 BC == 0, 2 BC == -1.
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month, ///< The month of year, calendar specific, in Gregorian [0..11]
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day, ///< The day of month, calendar specific, in Gregorian [1..31]
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day_of_year, ///< The number of day in year, starting from 1, in Gregorian [1..366]
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day_of_week, ///< Day of week, Sunday=1, Monday=2,..., Saturday=7.
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///< Note that updating this value respects local day of week, so for example,
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///< If first day of week is Monday and the current day is Tuesday then setting
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///< the value to Sunday (1) would forward the date by 5 days forward and not backward
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///< by two days as it could be expected if the numbers were taken as is.
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day_of_week_in_month, ///< Original number of the day of the week in month. For example 1st Sunday,
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///< 2nd Sunday, etc. in Gregorian [1..5]
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day_of_week_local, ///< Local day of week, for example in France Monday is 1, in US Sunday is 1, [1..7]
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hour, ///< 24 clock hour [0..23]
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hour_12, ///< 12 clock hour [0..11]
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am_pm, ///< am or pm marker [0..1]
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minute, ///< minute [0..59]
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second, ///< second [0..59]
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week_of_year, ///< The week number in the year
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week_of_month, ///< The week number within current month
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first_day_of_week, ///< First day of week, constant, for example Sunday in US = 1, Monday in France = 2
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};
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} // namespace marks
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/// \brief This class holds a type that represents certain period of time like
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/// year, hour, second and so on.
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///
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/// It can be created from either marks::period_mark type or by using shortcuts in period
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/// namespace - calling functions like period::year(), period::hour() and so on.
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///
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/// Basically it represents the same object as enum marks::period_mark but allows to
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/// provide save operator overloading that would not collide with casing of enum to
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/// numeric values.
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class period_type {
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public:
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/// Create a period of specific type, default is invalid.
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period_type(marks::period_mark m = marks::invalid) : mark_(m) {}
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/// Get the value of marks::period_mark it was created with.
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marks::period_mark mark() const { return mark_; }
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/// Check if two periods are the same
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bool operator==(const period_type& other) const { return mark() == other.mark(); }
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/// Check if two periods are different
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bool operator!=(const period_type& other) const { return mark() != other.mark(); }
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private:
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marks::period_mark mark_;
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};
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} // namespace period
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/// Structure that define POSIX time, seconds and milliseconds
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/// since Jan 1, 1970, 00:00 not including leap seconds.
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struct posix_time {
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int64_t seconds; ///< Seconds since epoch
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uint32_t nanoseconds; ///< Nanoseconds resolution
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};
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/// This class defines generic calendar class, it is used by date_time and calendar
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/// objects internally. It is less useful for end users, but it is build for localization
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/// backend implementation
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class BOOST_SYMBOL_VISIBLE abstract_calendar {
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public:
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/// Type that defines how to fetch the value
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enum value_type {
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absolute_minimum, ///< Absolute possible minimum for the value, for example for day is 1
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actual_minimum, ///< Actual minimal value for this period.
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greatest_minimum, ///< Maximal minimum value that can be for this period
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current, ///< Current value of this period
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least_maximum, ///< The last maximal value for this period, For example for Gregorian calendar
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///< day it is 28
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actual_maximum, ///< Actual maximum, for it can be 28, 29, 30, 31 for day according to current month
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absolute_maximum, ///< Maximal value, for Gregorian day it would be 31.
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};
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/// A way to update the value
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enum update_type {
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move, ///< Change the value up or down effecting others for example 1990-12-31 + 1 day = 1991-01-01
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roll, ///< Change the value up or down not effecting others for example 1990-12-31 + 1 day = 1990-12-01
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};
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/// Information about calendar
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enum calendar_option_type {
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is_gregorian, ///< Check if the calendar is Gregorian
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is_dst ///< Check if the current time is in daylight time savings
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};
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/// Make a polymorphic copy of the calendar
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virtual abstract_calendar* clone() const = 0;
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/// Set specific \a value for period \a p, note not all values are settable.
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///
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/// After calling set_value you may want to call normalize() function to make sure
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/// all periods are updated, if you set several fields that are part of a single
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/// date/time representation you should call set_value several times and then
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/// call normalize().
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///
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/// If normalize() is not called after set_value, the behavior is undefined
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virtual void set_value(period::marks::period_mark m, int value) = 0;
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/// Recalculate all periods after setting them, should be called after use of set_value() function.
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virtual void normalize() = 0;
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/// Get specific value for period \a p according to a value_type \a v
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virtual int get_value(period::marks::period_mark m, value_type v) const = 0;
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/// Set current time point
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virtual void set_time(const posix_time& p) = 0;
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/// Get current time point
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virtual posix_time get_time() const = 0;
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/// Get current time since epoch in milliseconds
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virtual double get_time_ms() const = 0;
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/// Set option for calendar, for future use
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virtual void set_option(calendar_option_type opt, int v) = 0;
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/// Get option for calendar, currently only check if it is Gregorian calendar
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virtual int get_option(calendar_option_type opt) const = 0;
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/// Adjust period's \a p value by \a difference items using a update_type \a u.
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/// Note: not all values are adjustable
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virtual void adjust_value(period::marks::period_mark m, update_type u, int difference) = 0;
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/// Calculate the difference between this calendar and \a other in \a p units
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virtual int difference(const abstract_calendar& other, period::marks::period_mark m) const = 0;
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/// Set time zone, empty - use system
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virtual void set_timezone(const std::string& tz) = 0;
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/// Get current time zone, empty - system one
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virtual std::string get_timezone() const = 0;
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/// Check of two calendars have same rules
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virtual bool same(const abstract_calendar* other) const = 0;
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virtual ~abstract_calendar() = default;
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};
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/// \brief the facet that generates calendar for specific locale
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class BOOST_SYMBOL_VISIBLE calendar_facet : public std::locale::facet, public detail::facet_id<calendar_facet> {
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public:
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/// Basic constructor
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calendar_facet(size_t refs = 0) : std::locale::facet(refs) {}
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/// Create a new calendar that points to current point of time.
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virtual abstract_calendar* create_calendar() const = 0;
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};
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}} // namespace boost::locale
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#ifdef BOOST_MSVC
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# pragma warning(pop)
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#endif
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#endif
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