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date/tz_private.h
Howard Hinnant 1e5d2fa8dd Create local and system time types for timezone functions. 
* Add sys_time.
* Add sys_days.
* Add sys_seconds.
* Add local_time.
* Add local_days.
* Add local_seconds.
* Rename day_point to sys_days.
* Rename Zone to time_zone.
2016-05-03 23:19:09 -04:00

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#ifndef TZ_PRIVATE_H
#define TZ_PRIVATE_H
// The MIT License (MIT)
//
// Copyright (c) 2015, 2016 Howard Hinnant
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// Our apologies. When the previous paragraph was written, lowercase had not yet
// been invented (that woud involve another several millennia of evolution).
// We did not mean to shout.
#include "tz.h"
namespace date
{
class MonthDayTime
{
private:
struct pair
{
#if defined(_MSC_VER) && (_MSC_VER < 1900)
pair() : month_day_(date::jan / 1), weekday_(0U) {}
pair(const date::month_day& month_day, const date::weekday& weekday)
: month_day_(month_day), weekday_(weekday) {}
#endif
date::month_day month_day_;
date::weekday weekday_;
};
enum Type {month_day, month_last_dow, lteq, gteq};
Type type_{month_day};
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
union U
#else
struct U
#endif
{
date::month_day month_day_;
date::month_weekday_last month_weekday_last_;
pair month_day_weekday_;
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
U() : month_day_{date::jan/1} {}
#else
U() :
month_day_(date::jan/1),
month_weekday_last_(date::month(0U), date::weekday_last(date::weekday(0U)))
{}
#endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
U& operator=(const date::month_day& x);
U& operator=(const date::month_weekday_last& x);
U& operator=(const pair& x);
} u;
std::chrono::hours h_{0};
std::chrono::minutes m_{0};
std::chrono::seconds s_{0};
tz zone_{tz::local};
public:
MonthDayTime() = default;
MonthDayTime(local_seconds tp, tz timezone);
MonthDayTime(const date::month_day& md, tz timezone);
date::day day() const;
date::month month() const;
tz zone() const {return zone_;}
void canonicalize(date::year y);
sys_seconds
to_sys(date::year y, std::chrono::seconds offset, std::chrono::seconds save) const;
sys_days to_sys_days(date::year y) const;
sys_seconds to_time_point(date::year y) const;
int compare(date::year y, const MonthDayTime& x, date::year yx,
std::chrono::seconds offset, std::chrono::minutes prev_save) const;
friend std::istream& operator>>(std::istream& is, MonthDayTime& x);
friend std::ostream& operator<<(std::ostream& os, const MonthDayTime& x);
};
// A Rule specifies one or more set of datetimes without using an offset.
// Multiple dates are specified with multiple years. The years in effect
// go from starting_year_ to ending_year_, inclusive. starting_year_ <=
// ending_year_. save_ is ineffect for times from the specified time
// onward, including the specified time. When the specified time is
// local, it uses the save_ from the chronologically previous Rule, or if
// there is none, 0.
class Rule
{
private:
std::string name_;
date::year starting_year_{0};
date::year ending_year_{0};
MonthDayTime starting_at_;
std::chrono::minutes save_{0};
std::string abbrev_;
public:
Rule() = default;
explicit Rule(const std::string& s);
Rule(const Rule& r, date::year starting_year, date::year ending_year);
const std::string& name() const {return name_;}
const std::string& abbrev() const {return abbrev_;}
const MonthDayTime& mdt() const {return starting_at_;}
const date::year& starting_year() const {return starting_year_;}
const date::year& ending_year() const {return ending_year_;}
const std::chrono::minutes& save() const {return save_;}
static void split_overlaps(std::vector<Rule>& rules);
friend bool operator==(const Rule& x, const Rule& y);
friend bool operator<(const Rule& x, const Rule& y);
friend bool operator==(const Rule& x, const date::year& y);
friend bool operator<(const Rule& x, const date::year& y);
friend bool operator==(const date::year& x, const Rule& y);
friend bool operator<(const date::year& x, const Rule& y);
friend bool operator==(const Rule& x, const std::string& y);
friend bool operator<(const Rule& x, const std::string& y);
friend bool operator==(const std::string& x, const Rule& y);
friend bool operator<(const std::string& x, const Rule& y);
friend std::ostream& operator<<(std::ostream& os, const Rule& r);
private:
date::day day() const;
date::month month() const;
static void split_overlaps(std::vector<Rule>& rules, std::size_t i, std::size_t& e);
static bool overlaps(const Rule& x, const Rule& y);
static void split(std::vector<Rule>& rules, std::size_t i, std::size_t k,
std::size_t& e);
};
inline bool operator!=(const Rule& x, const Rule& y) {return !(x == y);}
inline bool operator> (const Rule& x, const Rule& y) {return y < x;}
inline bool operator<=(const Rule& x, const Rule& y) {return !(y < x);}
inline bool operator>=(const Rule& x, const Rule& y) {return !(x < y);}
inline bool operator!=(const Rule& x, const date::year& y) {return !(x == y);}
inline bool operator> (const Rule& x, const date::year& y) {return y < x;}
inline bool operator<=(const Rule& x, const date::year& y) {return !(y < x);}
inline bool operator>=(const Rule& x, const date::year& y) {return !(x < y);}
inline bool operator!=(const date::year& x, const Rule& y) {return !(x == y);}
inline bool operator> (const date::year& x, const Rule& y) {return y < x;}
inline bool operator<=(const date::year& x, const Rule& y) {return !(y < x);}
inline bool operator>=(const date::year& x, const Rule& y) {return !(x < y);}
inline bool operator!=(const Rule& x, const std::string& y) {return !(x == y);}
inline bool operator> (const Rule& x, const std::string& y) {return y < x;}
inline bool operator<=(const Rule& x, const std::string& y) {return !(y < x);}
inline bool operator>=(const Rule& x, const std::string& y) {return !(x < y);}
inline bool operator!=(const std::string& x, const Rule& y) {return !(x == y);}
inline bool operator> (const std::string& x, const Rule& y) {return y < x;}
inline bool operator<=(const std::string& x, const Rule& y) {return !(y < x);}
inline bool operator>=(const std::string& x, const Rule& y) {return !(x < y);}
struct time_zone::zonelet
{
enum tag {has_rule, has_save, is_empty};
std::chrono::seconds gmtoff_;
tag tag_ = has_rule;
#if !defined(_MSC_VER) || (_MSC_VER >= 1900)
union U
#else
struct U
#endif
{
std::string rule_;
std::chrono::minutes save_;
~U() {}
U() {}
U(const U&) {}
U& operator=(const U&) = delete;
} u;
std::string format_;
date::year until_year_{0};
MonthDayTime until_date_;
sys_seconds until_utc_;
local_seconds until_std_;
local_seconds until_loc_;
std::chrono::minutes initial_save_{};
std::string initial_abbrev_;
std::pair<const Rule*, date::year> first_rule_{nullptr, date::year::min()};
std::pair<const Rule*, date::year> last_rule_{nullptr, date::year::max()};
~zonelet();
zonelet();
zonelet(const zonelet& i);
zonelet& operator=(const zonelet&) = delete;
};
} // namespace date
#endif // TZ_PRIVATE_H
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