diff options
Diffstat (limited to 'absl/time/time.cc')
| -rw-r--r-- | absl/time/time.cc | 299 |
1 files changed, 189 insertions, 110 deletions
diff --git a/absl/time/time.cc b/absl/time/time.cc index 71fd8ee6e743..0703856fa327 100644 --- a/absl/time/time.cc +++ b/absl/time/time.cc @@ -22,13 +22,14 @@ // NOTE: To keep type verbosity to a minimum, the following variable naming // conventions are used throughout this file. // -// cz: A cctz::time_zone // tz: An absl::TimeZone +// ci: An absl::TimeZone::CivilInfo +// ti: An absl::TimeZone::TimeInfo +// cd: An absl::CivilDay or a cctz::civil_day +// cs: An absl::CivilSecond or a cctz::civil_second +// bd: An absl::Time::Breakdown // cl: A cctz::time_zone::civil_lookup // al: A cctz::time_zone::absolute_lookup -// cd: A cctz::civil_day -// cs: A cctz::civil_second -// bd: An absl::Time::Breakdown #include "absl/time/time.h" @@ -75,7 +76,7 @@ inline absl::Time::Breakdown InfiniteFutureBreakdown() { return bd; } -inline Time::Breakdown InfinitePastBreakdown() { +inline absl::Time::Breakdown InfinitePastBreakdown() { Time::Breakdown bd; bd.year = std::numeric_limits<int64_t>::min(); bd.month = 1; @@ -92,6 +93,26 @@ inline Time::Breakdown InfinitePastBreakdown() { return bd; } +inline absl::TimeZone::CivilInfo InfiniteFutureCivilInfo() { + TimeZone::CivilInfo ci; + ci.cs = CivilSecond::max(); + ci.subsecond = InfiniteDuration(); + ci.offset = 0; + ci.is_dst = false; + ci.zone_abbr = "-00"; + return ci; +} + +inline absl::TimeZone::CivilInfo InfinitePastCivilInfo() { + TimeZone::CivilInfo ci; + ci.cs = CivilSecond::min(); + ci.subsecond = -InfiniteDuration(); + ci.offset = 0; + ci.is_dst = false; + ci.zone_abbr = "-00"; + return ci; +} + inline absl::TimeConversion InfiniteFutureTimeConversion() { absl::TimeConversion tc; tc.pre = tc.trans = tc.post = absl::InfiniteFuture(); @@ -134,19 +155,6 @@ Time MakeTimeWithOverflow(const cctz::time_point<cctz::seconds>& sec, return time_internal::FromUnixDuration(time_internal::MakeDuration(hi)); } -inline absl::TimeConversion::Kind MapKind( - const cctz::time_zone::civil_lookup::civil_kind& kind) { - switch (kind) { - case cctz::time_zone::civil_lookup::UNIQUE: - return absl::TimeConversion::UNIQUE; - case cctz::time_zone::civil_lookup::SKIPPED: - return absl::TimeConversion::SKIPPED; - case cctz::time_zone::civil_lookup::REPEATED: - return absl::TimeConversion::REPEATED; - } - return absl::TimeConversion::UNIQUE; -} - // Returns Mon=1..Sun=7. inline int MapWeekday(const cctz::weekday& wd) { switch (wd) { @@ -170,9 +178,13 @@ inline int MapWeekday(const cctz::weekday& wd) { } // namespace +// +// Time +// + absl::Time::Breakdown Time::In(absl::TimeZone tz) const { - if (*this == absl::InfiniteFuture()) return absl::InfiniteFutureBreakdown(); - if (*this == absl::InfinitePast()) return absl::InfinitePastBreakdown(); + if (*this == absl::InfiniteFuture()) return InfiniteFutureBreakdown(); + if (*this == absl::InfinitePast()) return InfinitePastBreakdown(); const auto tp = unix_epoch() + cctz::seconds(time_internal::GetRepHi(rep_)); const auto al = cctz::time_zone(tz).lookup(tp); @@ -187,92 +199,18 @@ absl::Time::Breakdown Time::In(absl::TimeZone tz) const { bd.minute = cs.minute(); bd.second = cs.second(); bd.subsecond = time_internal::MakeDuration(0, time_internal::GetRepLo(rep_)); - bd.weekday = MapWeekday(get_weekday(cd)); - bd.yearday = get_yearday(cd); + bd.weekday = MapWeekday(cctz::get_weekday(cd)); + bd.yearday = cctz::get_yearday(cd); bd.offset = al.offset; bd.is_dst = al.is_dst; bd.zone_abbr = al.abbr; return bd; } -absl::Time FromTM(const struct tm& tm, absl::TimeZone tz) { - const auto cz = cctz::time_zone(tz); - const auto cs = - cctz::civil_second(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, - tm.tm_hour, tm.tm_min, tm.tm_sec); - const auto cl = cz.lookup(cs); - const auto tp = tm.tm_isdst == 0 ? cl.post : cl.pre; - return MakeTimeWithOverflow(tp, cs, cz); -} - -struct tm ToTM(absl::Time t, absl::TimeZone tz) { - const absl::Time::Breakdown bd = t.In(tz); - struct tm tm; - std::memset(&tm, 0, sizeof(tm)); - tm.tm_sec = bd.second; - tm.tm_min = bd.minute; - tm.tm_hour = bd.hour; - tm.tm_mday = bd.day; - tm.tm_mon = bd.month - 1; - - // Saturates tm.tm_year in cases of over/underflow, accounting for the fact - // that tm.tm_year is years since 1900. - if (bd.year < std::numeric_limits<int>::min() + 1900) { - tm.tm_year = std::numeric_limits<int>::min(); - } else if (bd.year > std::numeric_limits<int>::max()) { - tm.tm_year = std::numeric_limits<int>::max() - 1900; - } else { - tm.tm_year = static_cast<int>(bd.year - 1900); - } - - tm.tm_wday = bd.weekday % 7; - tm.tm_yday = bd.yearday - 1; - tm.tm_isdst = bd.is_dst ? 1 : 0; - - return tm; -} - // -// Factory functions. +// Conversions from/to other time types. // -absl::TimeConversion ConvertDateTime(int64_t year, int mon, int day, int hour, - int min, int sec, TimeZone tz) { - // Avoids years that are too extreme for civil_second to normalize. - if (year > 300000000000) return InfiniteFutureTimeConversion(); - if (year < -300000000000) return InfinitePastTimeConversion(); - const auto cz = cctz::time_zone(tz); - const auto cs = cctz::civil_second(year, mon, day, hour, min, sec); - absl::TimeConversion tc; - tc.normalized = year != cs.year() || mon != cs.month() || day != cs.day() || - hour != cs.hour() || min != cs.minute() || sec != cs.second(); - const auto cl = cz.lookup(cs); - // Converts the civil_lookup struct to a TimeConversion. - tc.pre = MakeTimeWithOverflow(cl.pre, cs, cz, &tc.normalized); - tc.trans = MakeTimeWithOverflow(cl.trans, cs, cz, &tc.normalized); - tc.post = MakeTimeWithOverflow(cl.post, cs, cz, &tc.normalized); - tc.kind = MapKind(cl.kind); - return tc; -} - -absl::Time FromDateTime(int64_t year, int mon, int day, int hour, int min, - int sec, TimeZone tz) { - if (year > 300000000000) return InfiniteFuture(); - if (year < -300000000000) return InfinitePast(); - const auto cz = cctz::time_zone(tz); - const auto cs = cctz::civil_second(year, mon, day, hour, min, sec); - const auto cl = cz.lookup(cs); - return MakeTimeWithOverflow(cl.pre, cs, cz); -} - -absl::Time TimeFromTimespec(timespec ts) { - return time_internal::FromUnixDuration(absl::DurationFromTimespec(ts)); -} - -absl::Time TimeFromTimeval(timeval tv) { - return time_internal::FromUnixDuration(absl::DurationFromTimeval(tv)); -} - absl::Time FromUDate(double udate) { return time_internal::FromUnixDuration(absl::Milliseconds(udate)); } @@ -281,10 +219,6 @@ absl::Time FromUniversal(int64_t universal) { return absl::UniversalEpoch() + 100 * absl::Nanoseconds(universal); } -// -// Conversion to other time types. -// - int64_t ToUnixNanos(Time t) { if (time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >= 0 && time_internal::GetRepHi(time_internal::ToUnixDuration(t)) >> 33 == 0) { @@ -321,6 +255,23 @@ int64_t ToUnixSeconds(Time t) { time_t ToTimeT(Time t) { return absl::ToTimespec(t).tv_sec; } +double ToUDate(Time t) { + return absl::FDivDuration(time_internal::ToUnixDuration(t), + absl::Milliseconds(1)); +} + +int64_t ToUniversal(absl::Time t) { + return absl::FloorToUnit(t - absl::UniversalEpoch(), absl::Nanoseconds(100)); +} + +absl::Time TimeFromTimespec(timespec ts) { + return time_internal::FromUnixDuration(absl::DurationFromTimespec(ts)); +} + +absl::Time TimeFromTimeval(timeval tv) { + return time_internal::FromUnixDuration(absl::DurationFromTimeval(tv)); +} + timespec ToTimespec(Time t) { timespec ts; absl::Duration d = time_internal::ToUnixDuration(t); @@ -359,15 +310,6 @@ timeval ToTimeval(Time t) { return tv; } -double ToUDate(Time t) { - return absl::FDivDuration(time_internal::ToUnixDuration(t), - absl::Milliseconds(1)); -} - -int64_t ToUniversal(absl::Time t) { - return absl::FloorToUnit(t - absl::UniversalEpoch(), absl::Nanoseconds(100)); -} - Time FromChrono(const std::chrono::system_clock::time_point& tp) { return time_internal::FromUnixDuration(time_internal::FromChrono( tp - std::chrono::system_clock::from_time_t(0))); @@ -381,4 +323,141 @@ std::chrono::system_clock::time_point ToChronoTime(absl::Time t) { time_internal::ToChronoDuration<D>(d); } +// +// TimeZone +// + +absl::TimeZone::CivilInfo TimeZone::At(Time t) const { + if (t == absl::InfiniteFuture()) return InfiniteFutureCivilInfo(); + if (t == absl::InfinitePast()) return InfinitePastCivilInfo(); + + const auto ud = time_internal::ToUnixDuration(t); + const auto tp = unix_epoch() + cctz::seconds(time_internal::GetRepHi(ud)); + const auto al = cz_.lookup(tp); + + TimeZone::CivilInfo ci; + ci.cs = CivilSecond(al.cs); + ci.subsecond = time_internal::MakeDuration(0, time_internal::GetRepLo(ud)); + ci.offset = al.offset; + ci.is_dst = al.is_dst; + ci.zone_abbr = al.abbr; + return ci; +} + +absl::TimeZone::TimeInfo TimeZone::At(CivilSecond ct) const { + const cctz::civil_second cs(ct); + const auto cl = cz_.lookup(cs); + + TimeZone::TimeInfo ti; + switch (cl.kind) { + case cctz::time_zone::civil_lookup::UNIQUE: + ti.kind = TimeZone::TimeInfo::UNIQUE; + break; + case cctz::time_zone::civil_lookup::SKIPPED: + ti.kind = TimeZone::TimeInfo::SKIPPED; + break; + case cctz::time_zone::civil_lookup::REPEATED: + ti.kind = TimeZone::TimeInfo::REPEATED; + break; + } + ti.pre = MakeTimeWithOverflow(cl.pre, cs, cz_); + ti.trans = MakeTimeWithOverflow(cl.trans, cs, cz_); + ti.post = MakeTimeWithOverflow(cl.post, cs, cz_); + return ti; +} + +// +// Conversions involving time zones. +// + +absl::TimeConversion ConvertDateTime(int64_t year, int mon, int day, int hour, + int min, int sec, TimeZone tz) { + // Avoids years that are too extreme for CivilSecond to normalize. + if (year > 300000000000) return InfiniteFutureTimeConversion(); + if (year < -300000000000) return InfinitePastTimeConversion(); + + const CivilSecond cs(year, mon, day, hour, min, sec); + const auto ti = tz.At(cs); + + TimeConversion tc; + tc.pre = ti.pre; + tc.trans = ti.trans; + tc.post = ti.post; + switch (ti.kind) { + case TimeZone::TimeInfo::UNIQUE: + tc.kind = TimeConversion::UNIQUE; + break; + case TimeZone::TimeInfo::SKIPPED: + tc.kind = TimeConversion::SKIPPED; + break; + case TimeZone::TimeInfo::REPEATED: + tc.kind = TimeConversion::REPEATED; + break; + } + tc.normalized = false; + if (year != cs.year() || mon != cs.month() || day != cs.day() || + hour != cs.hour() || min != cs.minute() || sec != cs.second()) { + tc.normalized = true; + } + return tc; +} + +absl::Time FromTM(const struct tm& tm, absl::TimeZone tz) { + const CivilSecond cs(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, + tm.tm_hour, tm.tm_min, tm.tm_sec); + const auto ti = tz.At(cs); + return tm.tm_isdst == 0 ? ti.post : ti.pre; +} + +struct tm ToTM(absl::Time t, absl::TimeZone tz) { + struct tm tm = {}; + + const auto ci = tz.At(t); + const auto& cs = ci.cs; + tm.tm_sec = cs.second(); + tm.tm_min = cs.minute(); + tm.tm_hour = cs.hour(); + tm.tm_mday = cs.day(); + tm.tm_mon = cs.month() - 1; + + // Saturates tm.tm_year in cases of over/underflow, accounting for the fact + // that tm.tm_year is years since 1900. + if (cs.year() < std::numeric_limits<int>::min() + 1900) { + tm.tm_year = std::numeric_limits<int>::min(); + } else if (cs.year() > std::numeric_limits<int>::max()) { + tm.tm_year = std::numeric_limits<int>::max() - 1900; + } else { + tm.tm_year = static_cast<int>(cs.year() - 1900); + } + + const CivilDay cd(cs); + switch (GetWeekday(cd)) { + case Weekday::sunday: + tm.tm_wday = 0; + break; + case Weekday::monday: + tm.tm_wday = 1; + break; + case Weekday::tuesday: + tm.tm_wday = 2; + break; + case Weekday::wednesday: + tm.tm_wday = 3; + break; + case Weekday::thursday: + tm.tm_wday = 4; + break; + case Weekday::friday: + tm.tm_wday = 5; + break; + case Weekday::saturday: + tm.tm_wday = 6; + break; + } + tm.tm_yday = GetYearDay(cd) - 1; + tm.tm_isdst = ci.is_dst ? 1 : 0; + + return tm; +} + } // namespace absl |