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+// Copyright Toru Niina 2017.
+// Distributed under the MIT License.
+#ifndef TOML11_DATETIME_HPP
+#define TOML11_DATETIME_HPP
+#include <cstdint>
+#include <cstdlib>
+#include <ctime>
+
+#include <array>
+#include <chrono>
+#include <iomanip>
+#include <ostream>
+#include <tuple>
+
+namespace toml
+{
+
+// To avoid non-threadsafe std::localtime. In C11 (not C++11!), localtime_s is
+// provided in the absolutely same purpose, but C++11 is actually not compatible
+// with C11. We need to dispatch the function depending on the OS.
+namespace detail
+{
+// TODO: find more sophisticated way to handle this
+#if (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 1) || defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(_POSIX_SOURCE)
+inline std::tm localtime_s(const std::time_t* src)
+{
+ std::tm dst;
+ const auto result = ::localtime_r(src, &dst);
+ if (!result) { throw std::runtime_error("localtime_r failed."); }
+ return dst;
+}
+inline std::tm gmtime_s(const std::time_t* src)
+{
+ std::tm dst;
+ const auto result = ::gmtime_r(src, &dst);
+ if (!result) { throw std::runtime_error("gmtime_r failed."); }
+ return dst;
+}
+#elif defined(_MSC_VER)
+inline std::tm localtime_s(const std::time_t* src)
+{
+ std::tm dst;
+ const auto result = ::localtime_s(&dst, src);
+ if (result) { throw std::runtime_error("localtime_s failed."); }
+ return dst;
+}
+inline std::tm gmtime_s(const std::time_t* src)
+{
+ std::tm dst;
+ const auto result = ::gmtime_s(&dst, src);
+ if (result) { throw std::runtime_error("gmtime_s failed."); }
+ return dst;
+}
+#else // fallback. not threadsafe
+inline std::tm localtime_s(const std::time_t* src)
+{
+ const auto result = std::localtime(src);
+ if (!result) { throw std::runtime_error("localtime failed."); }
+ return *result;
+}
+inline std::tm gmtime_s(const std::time_t* src)
+{
+ const auto result = std::gmtime(src);
+ if (!result) { throw std::runtime_error("gmtime failed."); }
+ return *result;
+}
+#endif
+} // detail
+
+enum class month_t : std::uint8_t
+{
+ Jan = 0,
+ Feb = 1,
+ Mar = 2,
+ Apr = 3,
+ May = 4,
+ Jun = 5,
+ Jul = 6,
+ Aug = 7,
+ Sep = 8,
+ Oct = 9,
+ Nov = 10,
+ Dec = 11
+};
+
+struct local_date
+{
+ std::int16_t year; // A.D. (like, 2018)
+ std::uint8_t month; // [0, 11]
+ std::uint8_t day; // [1, 31]
+
+ local_date(int y, month_t m, int d)
+ : year (static_cast<std::int16_t>(y)),
+ month(static_cast<std::uint8_t>(m)),
+ day (static_cast<std::uint8_t>(d))
+ {}
+
+ explicit local_date(const std::tm& t)
+ : year (static_cast<std::int16_t>(t.tm_year + 1900)),
+ month(static_cast<std::uint8_t>(t.tm_mon)),
+ day (static_cast<std::uint8_t>(t.tm_mday))
+ {}
+
+ explicit local_date(const std::chrono::system_clock::time_point& tp)
+ {
+ const auto t = std::chrono::system_clock::to_time_t(tp);
+ const auto time = detail::localtime_s(&t);
+ *this = local_date(time);
+ }
+
+ explicit local_date(const std::time_t t)
+ : local_date(std::chrono::system_clock::from_time_t(t))
+ {}
+
+ operator std::chrono::system_clock::time_point() const
+ {
+ // std::mktime returns date as local time zone. no conversion needed
+ std::tm t;
+ t.tm_sec = 0;
+ t.tm_min = 0;
+ t.tm_hour = 0;
+ t.tm_mday = static_cast<int>(this->day);
+ t.tm_mon = static_cast<int>(this->month);
+ t.tm_year = static_cast<int>(this->year) - 1900;
+ t.tm_wday = 0; // the value will be ignored
+ t.tm_yday = 0; // the value will be ignored
+ t.tm_isdst = -1;
+ return std::chrono::system_clock::from_time_t(std::mktime(&t));
+ }
+
+ operator std::time_t() const
+ {
+ return std::chrono::system_clock::to_time_t(
+ std::chrono::system_clock::time_point(*this));
+ }
+
+ local_date() = default;
+ ~local_date() = default;
+ local_date(local_date const&) = default;
+ local_date(local_date&&) = default;
+ local_date& operator=(local_date const&) = default;
+ local_date& operator=(local_date&&) = default;
+};
+
+inline bool operator==(const local_date& lhs, const local_date& rhs)
+{
+ return std::make_tuple(lhs.year, lhs.month, lhs.day) ==
+ std::make_tuple(rhs.year, rhs.month, rhs.day);
+}
+inline bool operator!=(const local_date& lhs, const local_date& rhs)
+{
+ return !(lhs == rhs);
+}
+inline bool operator< (const local_date& lhs, const local_date& rhs)
+{
+ return std::make_tuple(lhs.year, lhs.month, lhs.day) <
+ std::make_tuple(rhs.year, rhs.month, rhs.day);
+}
+inline bool operator<=(const local_date& lhs, const local_date& rhs)
+{
+ return (lhs < rhs) || (lhs == rhs);
+}
+inline bool operator> (const local_date& lhs, const local_date& rhs)
+{
+ return !(lhs <= rhs);
+}
+inline bool operator>=(const local_date& lhs, const local_date& rhs)
+{
+ return !(lhs < rhs);
+}
+
+template<typename charT, typename traits>
+std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os, const local_date& date)
+{
+ os << std::setfill('0') << std::setw(4) << static_cast<int>(date.year ) << '-';
+ os << std::setfill('0') << std::setw(2) << static_cast<int>(date.month) + 1 << '-';
+ os << std::setfill('0') << std::setw(2) << static_cast<int>(date.day ) ;
+ return os;
+}
+
+struct local_time
+{
+ std::uint8_t hour; // [0, 23]
+ std::uint8_t minute; // [0, 59]
+ std::uint8_t second; // [0, 60]
+ std::uint16_t millisecond; // [0, 999]
+ std::uint16_t microsecond; // [0, 999]
+ std::uint16_t nanosecond; // [0, 999]
+
+ local_time(int h, int m, int s,
+ int ms = 0, int us = 0, int ns = 0)
+ : hour (static_cast<std::uint8_t>(h)),
+ minute(static_cast<std::uint8_t>(m)),
+ second(static_cast<std::uint8_t>(s)),
+ millisecond(static_cast<std::uint16_t>(ms)),
+ microsecond(static_cast<std::uint16_t>(us)),
+ nanosecond (static_cast<std::uint16_t>(ns))
+ {}
+
+ explicit local_time(const std::tm& t)
+ : hour (static_cast<std::uint8_t>(t.tm_hour)),
+ minute(static_cast<std::uint8_t>(t.tm_min)),
+ second(static_cast<std::uint8_t>(t.tm_sec)),
+ millisecond(0), microsecond(0), nanosecond(0)
+ {}
+
+ template<typename Rep, typename Period>
+ explicit local_time(const std::chrono::duration<Rep, Period>& t)
+ {
+ const auto h = std::chrono::duration_cast<std::chrono::hours>(t);
+ this->hour = static_cast<std::uint8_t>(h.count());
+ const auto t2 = t - h;
+ const auto m = std::chrono::duration_cast<std::chrono::minutes>(t2);
+ this->minute = static_cast<std::uint8_t>(m.count());
+ const auto t3 = t2 - m;
+ const auto s = std::chrono::duration_cast<std::chrono::seconds>(t3);
+ this->second = static_cast<std::uint8_t>(s.count());
+ const auto t4 = t3 - s;
+ const auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(t4);
+ this->millisecond = static_cast<std::uint16_t>(ms.count());
+ const auto t5 = t4 - ms;
+ const auto us = std::chrono::duration_cast<std::chrono::microseconds>(t5);
+ this->microsecond = static_cast<std::uint16_t>(us.count());
+ const auto t6 = t5 - us;
+ const auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(t6);
+ this->nanosecond = static_cast<std::uint16_t>(ns.count());
+ }
+
+ operator std::chrono::nanoseconds() const
+ {
+ return std::chrono::nanoseconds (this->nanosecond) +
+ std::chrono::microseconds(this->microsecond) +
+ std::chrono::milliseconds(this->millisecond) +
+ std::chrono::seconds(this->second) +
+ std::chrono::minutes(this->minute) +
+ std::chrono::hours(this->hour);
+ }
+
+ local_time() = default;
+ ~local_time() = default;
+ local_time(local_time const&) = default;
+ local_time(local_time&&) = default;
+ local_time& operator=(local_time const&) = default;
+ local_time& operator=(local_time&&) = default;
+};
+
+inline bool operator==(const local_time& lhs, const local_time& rhs)
+{
+ return std::make_tuple(lhs.hour, lhs.minute, lhs.second, lhs.millisecond, lhs.microsecond, lhs.nanosecond) ==
+ std::make_tuple(rhs.hour, rhs.minute, rhs.second, rhs.millisecond, rhs.microsecond, rhs.nanosecond);
+}
+inline bool operator!=(const local_time& lhs, const local_time& rhs)
+{
+ return !(lhs == rhs);
+}
+inline bool operator< (const local_time& lhs, const local_time& rhs)
+{
+ return std::make_tuple(lhs.hour, lhs.minute, lhs.second, lhs.millisecond, lhs.microsecond, lhs.nanosecond) <
+ std::make_tuple(rhs.hour, rhs.minute, rhs.second, rhs.millisecond, rhs.microsecond, rhs.nanosecond);
+}
+inline bool operator<=(const local_time& lhs, const local_time& rhs)
+{
+ return (lhs < rhs) || (lhs == rhs);
+}
+inline bool operator> (const local_time& lhs, const local_time& rhs)
+{
+ return !(lhs <= rhs);
+}
+inline bool operator>=(const local_time& lhs, const local_time& rhs)
+{
+ return !(lhs < rhs);
+}
+
+template<typename charT, typename traits>
+std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os, const local_time& time)
+{
+ os << std::setfill('0') << std::setw(2) << static_cast<int>(time.hour ) << ':';
+ os << std::setfill('0') << std::setw(2) << static_cast<int>(time.minute) << ':';
+ os << std::setfill('0') << std::setw(2) << static_cast<int>(time.second);
+ if(time.millisecond != 0 || time.microsecond != 0 || time.nanosecond != 0)
+ {
+ os << '.';
+ os << std::setfill('0') << std::setw(3) << static_cast<int>(time.millisecond);
+ if(time.microsecond != 0 || time.nanosecond != 0)
+ {
+ os << std::setfill('0') << std::setw(3) << static_cast<int>(time.microsecond);
+ if(time.nanosecond != 0)
+ {
+ os << std::setfill('0') << std::setw(3) << static_cast<int>(time.nanosecond);
+ }
+ }
+ }
+ return os;
+}
+
+struct time_offset
+{
+ std::int8_t hour; // [-12, 12]
+ std::int8_t minute; // [-59, 59]
+
+ time_offset(int h, int m)
+ : hour (static_cast<std::int8_t>(h)),
+ minute(static_cast<std::int8_t>(m))
+ {}
+
+ operator std::chrono::minutes() const
+ {
+ return std::chrono::minutes(this->minute) +
+ std::chrono::hours(this->hour);
+ }
+
+ time_offset() = default;
+ ~time_offset() = default;
+ time_offset(time_offset const&) = default;
+ time_offset(time_offset&&) = default;
+ time_offset& operator=(time_offset const&) = default;
+ time_offset& operator=(time_offset&&) = default;
+};
+
+inline bool operator==(const time_offset& lhs, const time_offset& rhs)
+{
+ return std::make_tuple(lhs.hour, lhs.minute) ==
+ std::make_tuple(rhs.hour, rhs.minute);
+}
+inline bool operator!=(const time_offset& lhs, const time_offset& rhs)
+{
+ return !(lhs == rhs);
+}
+inline bool operator< (const time_offset& lhs, const time_offset& rhs)
+{
+ return std::make_tuple(lhs.hour, lhs.minute) <
+ std::make_tuple(rhs.hour, rhs.minute);
+}
+inline bool operator<=(const time_offset& lhs, const time_offset& rhs)
+{
+ return (lhs < rhs) || (lhs == rhs);
+}
+inline bool operator> (const time_offset& lhs, const time_offset& rhs)
+{
+ return !(lhs <= rhs);
+}
+inline bool operator>=(const time_offset& lhs, const time_offset& rhs)
+{
+ return !(lhs < rhs);
+}
+
+template<typename charT, typename traits>
+std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os, const time_offset& offset)
+{
+ if(offset.hour == 0 && offset.minute == 0)
+ {
+ os << 'Z';
+ return os;
+ }
+ int minute = static_cast<int>(offset.hour) * 60 + offset.minute;
+ if(minute < 0){os << '-'; minute = std::abs(minute);} else {os << '+';}
+ os << std::setfill('0') << std::setw(2) << minute / 60 << ':';
+ os << std::setfill('0') << std::setw(2) << minute % 60;
+ return os;
+}
+
+struct local_datetime
+{
+ local_date date;
+ local_time time;
+
+ local_datetime(local_date d, local_time t): date(d), time(t) {}
+
+ explicit local_datetime(const std::tm& t): date(t), time(t){}
+
+ explicit local_datetime(const std::chrono::system_clock::time_point& tp)
+ {
+ const auto t = std::chrono::system_clock::to_time_t(tp);
+ std::tm ltime = detail::localtime_s(&t);
+
+ this->date = local_date(ltime);
+ this->time = local_time(ltime);
+
+ // std::tm lacks subsecond information, so diff between tp and tm
+ // can be used to get millisecond & microsecond information.
+ const auto t_diff = tp -
+ std::chrono::system_clock::from_time_t(std::mktime(&ltime));
+ this->time.millisecond = static_cast<std::uint16_t>(
+ std::chrono::duration_cast<std::chrono::milliseconds>(t_diff).count());
+ this->time.microsecond = static_cast<std::uint16_t>(
+ std::chrono::duration_cast<std::chrono::microseconds>(t_diff).count());
+ this->time.nanosecond = static_cast<std::uint16_t>(
+ std::chrono::duration_cast<std::chrono::nanoseconds >(t_diff).count());
+ }
+
+ explicit local_datetime(const std::time_t t)
+ : local_datetime(std::chrono::system_clock::from_time_t(t))
+ {}
+
+ operator std::chrono::system_clock::time_point() const
+ {
+ using internal_duration =
+ typename std::chrono::system_clock::time_point::duration;
+
+ // Normally DST begins at A.M. 3 or 4. If we re-use conversion operator
+ // of local_date and local_time independently, the conversion fails if
+ // it is the day when DST begins or ends. Since local_date considers the
+ // time is 00:00 A.M. and local_time does not consider DST because it
+ // does not have any date information. We need to consider both date and
+ // time information at the same time to convert it correctly.
+
+ std::tm t;
+ t.tm_sec = static_cast<int>(this->time.second);
+ t.tm_min = static_cast<int>(this->time.minute);
+ t.tm_hour = static_cast<int>(this->time.hour);
+ t.tm_mday = static_cast<int>(this->date.day);
+ t.tm_mon = static_cast<int>(this->date.month);
+ t.tm_year = static_cast<int>(this->date.year) - 1900;
+ t.tm_wday = 0; // the value will be ignored
+ t.tm_yday = 0; // the value will be ignored
+ t.tm_isdst = -1;
+
+ // std::mktime returns date as local time zone. no conversion needed
+ auto dt = std::chrono::system_clock::from_time_t(std::mktime(&t));
+ dt += std::chrono::duration_cast<internal_duration>(
+ std::chrono::milliseconds(this->time.millisecond) +
+ std::chrono::microseconds(this->time.microsecond) +
+ std::chrono::nanoseconds (this->time.nanosecond));
+ return dt;
+ }
+
+ operator std::time_t() const
+ {
+ return std::chrono::system_clock::to_time_t(
+ std::chrono::system_clock::time_point(*this));
+ }
+
+ local_datetime() = default;
+ ~local_datetime() = default;
+ local_datetime(local_datetime const&) = default;
+ local_datetime(local_datetime&&) = default;
+ local_datetime& operator=(local_datetime const&) = default;
+ local_datetime& operator=(local_datetime&&) = default;
+};
+
+inline bool operator==(const local_datetime& lhs, const local_datetime& rhs)
+{
+ return std::make_tuple(lhs.date, lhs.time) ==
+ std::make_tuple(rhs.date, rhs.time);
+}
+inline bool operator!=(const local_datetime& lhs, const local_datetime& rhs)
+{
+ return !(lhs == rhs);
+}
+inline bool operator< (const local_datetime& lhs, const local_datetime& rhs)
+{
+ return std::make_tuple(lhs.date, lhs.time) <
+ std::make_tuple(rhs.date, rhs.time);
+}
+inline bool operator<=(const local_datetime& lhs, const local_datetime& rhs)
+{
+ return (lhs < rhs) || (lhs == rhs);
+}
+inline bool operator> (const local_datetime& lhs, const local_datetime& rhs)
+{
+ return !(lhs <= rhs);
+}
+inline bool operator>=(const local_datetime& lhs, const local_datetime& rhs)
+{
+ return !(lhs < rhs);
+}
+
+template<typename charT, typename traits>
+std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os, const local_datetime& dt)
+{
+ os << dt.date << 'T' << dt.time;
+ return os;
+}
+
+struct offset_datetime
+{
+ local_date date;
+ local_time time;
+ time_offset offset;
+
+ offset_datetime(local_date d, local_time t, time_offset o)
+ : date(d), time(t), offset(o)
+ {}
+ offset_datetime(const local_datetime& dt, time_offset o)
+ : date(dt.date), time(dt.time), offset(o)
+ {}
+ explicit offset_datetime(const local_datetime& ld)
+ : date(ld.date), time(ld.time), offset(get_local_offset(nullptr))
+ // use the current local timezone offset
+ {}
+ explicit offset_datetime(const std::chrono::system_clock::time_point& tp)
+ : offset(0, 0) // use gmtime
+ {
+ const auto timet = std::chrono::system_clock::to_time_t(tp);
+ const auto tm = detail::gmtime_s(&timet);
+ this->date = local_date(tm);
+ this->time = local_time(tm);
+ }
+ explicit offset_datetime(const std::time_t& t)
+ : offset(0, 0) // use gmtime
+ {
+ const auto tm = detail::gmtime_s(&t);
+ this->date = local_date(tm);
+ this->time = local_time(tm);
+ }
+ explicit offset_datetime(const std::tm& t)
+ : offset(0, 0) // assume gmtime
+ {
+ this->date = local_date(t);
+ this->time = local_time(t);
+ }
+
+ operator std::chrono::system_clock::time_point() const
+ {
+ // get date-time
+ using internal_duration =
+ typename std::chrono::system_clock::time_point::duration;
+
+ // first, convert it to local date-time information in the same way as
+ // local_datetime does. later we will use time_t to adjust time offset.
+ std::tm t;
+ t.tm_sec = static_cast<int>(this->time.second);
+ t.tm_min = static_cast<int>(this->time.minute);
+ t.tm_hour = static_cast<int>(this->time.hour);
+ t.tm_mday = static_cast<int>(this->date.day);
+ t.tm_mon = static_cast<int>(this->date.month);
+ t.tm_year = static_cast<int>(this->date.year) - 1900;
+ t.tm_wday = 0; // the value will be ignored
+ t.tm_yday = 0; // the value will be ignored
+ t.tm_isdst = -1;
+ const std::time_t tp_loc = std::mktime(std::addressof(t));
+
+ auto tp = std::chrono::system_clock::from_time_t(tp_loc);
+ tp += std::chrono::duration_cast<internal_duration>(
+ std::chrono::milliseconds(this->time.millisecond) +
+ std::chrono::microseconds(this->time.microsecond) +
+ std::chrono::nanoseconds (this->time.nanosecond));
+
+ // Since mktime uses local time zone, it should be corrected.
+ // `12:00:00+09:00` means `03:00:00Z`. So mktime returns `03:00:00Z` if
+ // we are in `+09:00` timezone. To represent `12:00:00Z` there, we need
+ // to add `+09:00` to `03:00:00Z`.
+ // Here, it uses the time_t converted from date-time info to handle
+ // daylight saving time.
+ const auto ofs = get_local_offset(std::addressof(tp_loc));
+ tp += std::chrono::hours (ofs.hour);
+ tp += std::chrono::minutes(ofs.minute);
+
+ // We got `12:00:00Z` by correcting local timezone applied by mktime.
+ // Then we will apply the offset. Let's say `12:00:00-08:00` is given.
+ // And now, we have `12:00:00Z`. `12:00:00-08:00` means `20:00:00Z`.
+ // So we need to subtract the offset.
+ tp -= std::chrono::minutes(this->offset);
+ return tp;
+ }
+
+ operator std::time_t() const
+ {
+ return std::chrono::system_clock::to_time_t(
+ std::chrono::system_clock::time_point(*this));
+ }
+
+ offset_datetime() = default;
+ ~offset_datetime() = default;
+ offset_datetime(offset_datetime const&) = default;
+ offset_datetime(offset_datetime&&) = default;
+ offset_datetime& operator=(offset_datetime const&) = default;
+ offset_datetime& operator=(offset_datetime&&) = default;
+
+ private:
+
+ static time_offset get_local_offset(const std::time_t* tp)
+ {
+ // get local timezone with the same date-time information as mktime
+ const auto t = detail::localtime_s(tp);
+
+ std::array<char, 6> buf;
+ const auto result = std::strftime(buf.data(), 6, "%z", &t); // +hhmm\0
+ if(result != 5)
+ {
+ throw std::runtime_error("toml::offset_datetime: cannot obtain "
+ "timezone information of current env");
+ }
+ const int ofs = std::atoi(buf.data());
+ const int ofs_h = ofs / 100;
+ const int ofs_m = ofs - (ofs_h * 100);
+ return time_offset(ofs_h, ofs_m);
+ }
+};
+
+inline bool operator==(const offset_datetime& lhs, const offset_datetime& rhs)
+{
+ return std::make_tuple(lhs.date, lhs.time, lhs.offset) ==
+ std::make_tuple(rhs.date, rhs.time, rhs.offset);
+}
+inline bool operator!=(const offset_datetime& lhs, const offset_datetime& rhs)
+{
+ return !(lhs == rhs);
+}
+inline bool operator< (const offset_datetime& lhs, const offset_datetime& rhs)
+{
+ return std::make_tuple(lhs.date, lhs.time, lhs.offset) <
+ std::make_tuple(rhs.date, rhs.time, rhs.offset);
+}
+inline bool operator<=(const offset_datetime& lhs, const offset_datetime& rhs)
+{
+ return (lhs < rhs) || (lhs == rhs);
+}
+inline bool operator> (const offset_datetime& lhs, const offset_datetime& rhs)
+{
+ return !(lhs <= rhs);
+}
+inline bool operator>=(const offset_datetime& lhs, const offset_datetime& rhs)
+{
+ return !(lhs < rhs);
+}
+
+template<typename charT, typename traits>
+std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os, const offset_datetime& dt)
+{
+ os << dt.date << 'T' << dt.time << dt.offset;
+ return os;
+}
+
+}//toml
+#endif// TOML11_DATETIME
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 12:58:00 +0000