mirror of
https://github.com/HowardHinnant/date.git
synced 2024-12-27 08:31:03 +08:00
a610f087c1
* Avoids the need to download the IANA database. * Heavily based on contributions by Aaron Bishop. * Turn on with -DUSE_OS_TZDB, off by default. * Not supported on Windows. * Disables HAS_REMOTE_API. * get_tzdb().version only supported on Apple. This string has the value "unknown" elsewhere. * Leap second support is missing on Apple, and may not be on your platform either (please report). Leap second support is enabled, disabled with -DMISSING_LEAP_SECONDS. Without leap second support, utc_time, tai_time, and gps_time (and those clocks) are not available. * On Apple, time zone transitions are only supported in the range: 1901-12-13 20:45:52 to 2038-01-19 03:14:07 * On Linux, time zone transitions are only as far in the future as the OS-provided transitions go. There is no support for POSIX- style transitions.
318 lines
10 KiB
C++
318 lines
10 KiB
C++
#ifndef TZ_PRIVATE_H
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#define TZ_PRIVATE_H
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// The MIT License (MIT)
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//
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// Copyright (c) 2015, 2016 Howard Hinnant
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// Our apologies. When the previous paragraph was written, lowercase had not yet
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// been invented (that would involve another several millennia of evolution).
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// We did not mean to shout.
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#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
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#include "tz.h"
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#else
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#include "date.h"
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#include <vector>
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#endif
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namespace date
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{
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namespace detail
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{
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#if !USE_OS_TZDB
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enum class tz {utc, local, standard};
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//forward declare to avoid warnings in gcc 6.2
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class MonthDayTime;
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std::istream& operator>>(std::istream& is, MonthDayTime& x);
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std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
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class MonthDayTime
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{
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private:
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struct pair
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{
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#if defined(_MSC_VER) && (_MSC_VER < 1900)
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pair() : month_day_(date::jan / 1), weekday_(0U) {}
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pair(const date::month_day& month_day, const date::weekday& weekday)
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: month_day_(month_day), weekday_(weekday) {}
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#endif
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date::month_day month_day_;
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date::weekday weekday_;
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};
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enum Type {month_day, month_last_dow, lteq, gteq};
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Type type_{month_day};
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#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
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union U
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#else
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struct U
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#endif
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{
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date::month_day month_day_;
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date::month_weekday_last month_weekday_last_;
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pair month_day_weekday_;
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#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
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U() : month_day_{date::jan/1} {}
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#else
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U() :
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month_day_(date::jan/1),
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month_weekday_last_(date::month(0U), date::weekday_last(date::weekday(0U)))
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{}
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#endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
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U& operator=(const date::month_day& x);
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U& operator=(const date::month_weekday_last& x);
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U& operator=(const pair& x);
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} u;
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std::chrono::hours h_{0};
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std::chrono::minutes m_{0};
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std::chrono::seconds s_{0};
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tz zone_{tz::local};
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public:
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MonthDayTime() = default;
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MonthDayTime(local_seconds tp, tz timezone);
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MonthDayTime(const date::month_day& md, tz timezone);
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date::day day() const;
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date::month month() const;
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tz zone() const {return zone_;}
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void canonicalize(date::year y);
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sys_seconds
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to_sys(date::year y, std::chrono::seconds offset, std::chrono::seconds save) const;
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sys_days to_sys_days(date::year y) const;
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sys_seconds to_time_point(date::year y) const;
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int compare(date::year y, const MonthDayTime& x, date::year yx,
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std::chrono::seconds offset, std::chrono::minutes prev_save) const;
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friend std::istream& operator>>(std::istream& is, MonthDayTime& x);
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friend std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
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};
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// A Rule specifies one or more set of datetimes without using an offset.
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// Multiple dates are specified with multiple years. The years in effect
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// go from starting_year_ to ending_year_, inclusive. starting_year_ <=
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// ending_year_. save_ is in effect for times from the specified time
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// onward, including the specified time. When the specified time is
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// local, it uses the save_ from the chronologically previous Rule, or if
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// there is none, 0.
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//forward declare to avoid warnings in gcc 6.2
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class Rule;
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bool operator==(const Rule& x, const Rule& y);
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bool operator<(const Rule& x, const Rule& y);
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bool operator==(const Rule& x, const date::year& y);
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bool operator<(const Rule& x, const date::year& y);
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bool operator==(const date::year& x, const Rule& y);
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bool operator<(const date::year& x, const Rule& y);
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bool operator==(const Rule& x, const std::string& y);
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bool operator<(const Rule& x, const std::string& y);
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bool operator==(const std::string& x, const Rule& y);
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bool operator<(const std::string& x, const Rule& y);
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std::ostream& operator<<(std::ostream& os, const Rule& r);
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class Rule
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{
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private:
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std::string name_;
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date::year starting_year_{0};
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date::year ending_year_{0};
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MonthDayTime starting_at_;
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std::chrono::minutes save_{0};
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std::string abbrev_;
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public:
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Rule() = default;
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explicit Rule(const std::string& s);
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Rule(const Rule& r, date::year starting_year, date::year ending_year);
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const std::string& name() const {return name_;}
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const std::string& abbrev() const {return abbrev_;}
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const MonthDayTime& mdt() const {return starting_at_;}
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const date::year& starting_year() const {return starting_year_;}
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const date::year& ending_year() const {return ending_year_;}
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const std::chrono::minutes& save() const {return save_;}
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static void split_overlaps(std::vector<Rule>& rules);
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friend bool operator==(const Rule& x, const Rule& y);
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friend bool operator<(const Rule& x, const Rule& y);
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friend bool operator==(const Rule& x, const date::year& y);
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friend bool operator<(const Rule& x, const date::year& y);
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friend bool operator==(const date::year& x, const Rule& y);
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friend bool operator<(const date::year& x, const Rule& y);
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friend bool operator==(const Rule& x, const std::string& y);
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friend bool operator<(const Rule& x, const std::string& y);
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friend bool operator==(const std::string& x, const Rule& y);
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friend bool operator<(const std::string& x, const Rule& y);
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friend std::ostream& operator<<(std::ostream& os, const Rule& r);
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private:
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date::day day() const;
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date::month month() const;
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static void split_overlaps(std::vector<Rule>& rules, std::size_t i, std::size_t& e);
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static bool overlaps(const Rule& x, const Rule& y);
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static void split(std::vector<Rule>& rules, std::size_t i, std::size_t k,
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std::size_t& e);
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};
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inline bool operator!=(const Rule& x, const Rule& y) {return !(x == y);}
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inline bool operator> (const Rule& x, const Rule& y) {return y < x;}
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inline bool operator<=(const Rule& x, const Rule& y) {return !(y < x);}
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inline bool operator>=(const Rule& x, const Rule& y) {return !(x < y);}
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inline bool operator!=(const Rule& x, const date::year& y) {return !(x == y);}
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inline bool operator> (const Rule& x, const date::year& y) {return y < x;}
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inline bool operator<=(const Rule& x, const date::year& y) {return !(y < x);}
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inline bool operator>=(const Rule& x, const date::year& y) {return !(x < y);}
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inline bool operator!=(const date::year& x, const Rule& y) {return !(x == y);}
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inline bool operator> (const date::year& x, const Rule& y) {return y < x;}
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inline bool operator<=(const date::year& x, const Rule& y) {return !(y < x);}
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inline bool operator>=(const date::year& x, const Rule& y) {return !(x < y);}
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inline bool operator!=(const Rule& x, const std::string& y) {return !(x == y);}
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inline bool operator> (const Rule& x, const std::string& y) {return y < x;}
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inline bool operator<=(const Rule& x, const std::string& y) {return !(y < x);}
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inline bool operator>=(const Rule& x, const std::string& y) {return !(x < y);}
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inline bool operator!=(const std::string& x, const Rule& y) {return !(x == y);}
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inline bool operator> (const std::string& x, const Rule& y) {return y < x;}
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inline bool operator<=(const std::string& x, const Rule& y) {return !(y < x);}
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inline bool operator>=(const std::string& x, const Rule& y) {return !(x < y);}
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struct zonelet
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{
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enum tag {has_rule, has_save, is_empty};
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std::chrono::seconds gmtoff_;
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tag tag_ = has_rule;
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#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
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union U
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#else
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struct U
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#endif
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{
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std::string rule_;
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std::chrono::minutes save_;
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~U() {}
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U() {}
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U(const U&) {}
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U& operator=(const U&) = delete;
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} u;
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std::string format_;
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date::year until_year_{0};
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MonthDayTime until_date_;
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sys_seconds until_utc_;
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local_seconds until_std_;
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local_seconds until_loc_;
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std::chrono::minutes initial_save_{};
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std::string initial_abbrev_;
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std::pair<const Rule*, date::year> first_rule_{nullptr, date::year::min()};
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std::pair<const Rule*, date::year> last_rule_{nullptr, date::year::max()};
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~zonelet();
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zonelet();
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zonelet(const zonelet& i);
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zonelet& operator=(const zonelet&) = delete;
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};
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#else // USE_OS_TZDB
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struct ttinfo
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{
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std::int32_t tt_gmtoff;
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unsigned char tt_isdst;
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unsigned char tt_abbrind;
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unsigned char pad[2];
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};
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static_assert(sizeof(ttinfo) == 8, "");
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struct expanded_ttinfo
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{
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std::chrono::seconds offset;
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std::string abbrev;
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bool is_dst;
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};
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struct transition
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{
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sys_seconds timepoint;
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const expanded_ttinfo* info;
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transition(sys_seconds tp, const expanded_ttinfo* i = nullptr)
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: timepoint(tp)
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, info(i)
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{}
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friend
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std::ostream&
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operator<<(std::ostream& os, const transition& t)
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{
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using namespace date;
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using namespace std::chrono;
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os << t.timepoint << "Z ";
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if (t.info->offset >= seconds{0})
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os << '+';
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os << make_time(t.info->offset);
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if (t.info->is_dst > 0)
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os << " daylight ";
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else
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os << " standard ";
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os << t.info->abbrev;
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return os;
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}
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};
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#endif // USE_OS_TZDB
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} // namespace detail
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} // namespace date
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#if defined(_MSC_VER) && (_MSC_VER < 1900)
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#include "tz.h"
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#endif
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#endif // TZ_PRIVATE_H
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