543 lines
22 KiB
Rust
543 lines
22 KiB
Rust
// This is a part of rust-chrono.
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// Copyright (c) 2014, Kang Seonghoon.
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// See README.md and LICENSE.txt for details.
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/*!
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* Offsets from the local time to UTC.
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*/
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use std::fmt;
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use std::str::SendStr;
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use stdtime;
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use {Weekday, Datelike, Timelike};
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use div::div_mod_floor;
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use duration::Duration;
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use naive::date::NaiveDate;
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use naive::time::NaiveTime;
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use naive::datetime::NaiveDateTime;
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use date::Date;
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use time::Time;
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use datetime::DateTime;
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/// The conversion result from the local time to the timezone-aware datetime types.
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#[deriving(Clone, PartialEq, Show)]
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pub enum LocalResult<T> {
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/// Given local time representation is invalid.
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/// This can occur when, for example, the positive timezone transition.
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None,
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/// Given local time representation has a single unique result.
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Single(T),
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/// Given local time representation has multiple results and thus ambiguous.
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/// This can occur when, for example, the negative timezone transition.
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Ambiguous(T /*min*/, T /*max*/),
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}
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impl<T> LocalResult<T> {
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/// Returns `Some` only when the conversion result is unique, or `None` otherwise.
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pub fn single(self) -> Option<T> {
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match self { LocalResult::Single(t) => Some(t), _ => None }
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}
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/// Returns `Some` for the earliest possible conversion result, or `None` if none.
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pub fn earliest(self) -> Option<T> {
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match self { LocalResult::Single(t) | LocalResult::Ambiguous(t,_) => Some(t), _ => None }
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}
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/// Returns `Some` for the latest possible conversion result, or `None` if none.
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pub fn latest(self) -> Option<T> {
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match self { LocalResult::Single(t) | LocalResult::Ambiguous(_,t) => Some(t), _ => None }
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}
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}
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impl<Off:Offset> LocalResult<Date<Off>> {
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/// Makes a new `DateTime` from the current date and given `NaiveTime`.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_time(self, time: NaiveTime) -> LocalResult<DateTime<Off>> {
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match self {
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LocalResult::Single(d) => d.and_time(time)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute and second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_opt(self, hour: u32, min: u32, sec: u32) -> LocalResult<DateTime<Off>> {
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match self {
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LocalResult::Single(d) => d.and_hms_opt(hour, min, sec)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute, second and millisecond.
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/// The millisecond part can exceed 1,000 in order to represent the leap second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_milli_opt(self, hour: u32, min: u32, sec: u32,
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milli: u32) -> LocalResult<DateTime<Off>> {
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match self {
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LocalResult::Single(d) => d.and_hms_milli_opt(hour, min, sec, milli)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute, second and microsecond.
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/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_micro_opt(self, hour: u32, min: u32, sec: u32,
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micro: u32) -> LocalResult<DateTime<Off>> {
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match self {
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LocalResult::Single(d) => d.and_hms_micro_opt(hour, min, sec, micro)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute, second and nanosecond.
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/// The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_nano_opt(self, hour: u32, min: u32, sec: u32,
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nano: u32) -> LocalResult<DateTime<Off>> {
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match self {
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LocalResult::Single(d) => d.and_hms_nano_opt(hour, min, sec, nano)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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}
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impl<T:fmt::Show> LocalResult<T> {
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/// Returns the single unique conversion result, or fails accordingly.
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pub fn unwrap(self) -> T {
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match self {
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LocalResult::None => panic!("No such local time"),
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LocalResult::Single(t) => t,
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LocalResult::Ambiguous(t1,t2) => {
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panic!("Ambiguous local time, ranging from {} to {}", t1, t2)
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}
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}
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}
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}
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/// The offset from the local time to UTC.
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pub trait Offset: Clone + fmt::Show {
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/// Makes a new `Date` from year, month, day and the current offset.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The offset normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Fails on the out-of-range date, invalid month and/or day.
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fn ymd(&self, year: i32, month: u32, day: u32) -> Date<Self> {
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self.ymd_opt(year, month, day).unwrap()
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}
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/// Makes a new `Date` from year, month, day and the current offset.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The offset normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Returns `None` on the out-of-range date, invalid month and/or day.
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fn ymd_opt(&self, year: i32, month: u32, day: u32) -> LocalResult<Date<Self>> {
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match NaiveDate::from_ymd_opt(year, month, day) {
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Some(d) => self.from_local_date(&d),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Date` from year, day of year (DOY or "ordinal") and the current offset.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The offset normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Fails on the out-of-range date and/or invalid DOY.
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fn yo(&self, year: i32, ordinal: u32) -> Date<Self> {
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self.yo_opt(year, ordinal).unwrap()
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}
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/// Makes a new `Date` from year, day of year (DOY or "ordinal") and the current offset.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The offset normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Returns `None` on the out-of-range date and/or invalid DOY.
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fn yo_opt(&self, year: i32, ordinal: u32) -> LocalResult<Date<Self>> {
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match NaiveDate::from_yo_opt(year, ordinal) {
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Some(d) => self.from_local_date(&d),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Date` from ISO week date (year and week number), day of the week (DOW) and
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/// the current offset.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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/// The resulting `Date` may have a different year from the input year.
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///
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/// The offset normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Fails on the out-of-range date and/or invalid week number.
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fn isoywd(&self, year: i32, week: u32, weekday: Weekday) -> Date<Self> {
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self.isoywd_opt(year, week, weekday).unwrap()
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}
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/// Makes a new `Date` from ISO week date (year and week number), day of the week (DOW) and
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/// the current offset.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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/// The resulting `Date` may have a different year from the input year.
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///
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/// The offset normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Returns `None` on the out-of-range date and/or invalid week number.
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fn isoywd_opt(&self, year: i32, week: u32, weekday: Weekday) -> LocalResult<Date<Self>> {
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match NaiveDate::from_isoywd_opt(year, week, weekday) {
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Some(d) => self.from_local_date(&d),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Time` from hour, minute, second and the current offset.
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///
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/// Fails on invalid hour, minute and/or second.
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fn hms(&self, hour: u32, min: u32, sec: u32) -> Time<Self> {
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self.hms_opt(hour, min, sec).unwrap()
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}
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/// Makes a new `Time` from hour, minute, second and the current offset.
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///
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/// Returns `None` on invalid hour, minute and/or second.
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fn hms_opt(&self, hour: u32, min: u32, sec: u32) -> LocalResult<Time<Self>> {
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match NaiveTime::from_hms_opt(hour, min, sec) {
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Some(t) => self.from_local_time(&t),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Time` from hour, minute, second, millisecond and the current offset.
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/// The millisecond part can exceed 1,000 in order to represent the leap second.
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///
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/// Fails on invalid hour, minute, second and/or millisecond.
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fn hms_milli(&self, hour: u32, min: u32, sec: u32, milli: u32) -> Time<Self> {
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self.hms_milli_opt(hour, min, sec, milli).unwrap()
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}
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/// Makes a new `Time` from hour, minute, second, millisecond and the current offset.
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/// The millisecond part can exceed 1,000 in order to represent the leap second.
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///
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/// Returns `None` on invalid hour, minute, second and/or millisecond.
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fn hms_milli_opt(&self, hour: u32, min: u32, sec: u32, milli: u32) -> LocalResult<Time<Self>> {
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match NaiveTime::from_hms_milli_opt(hour, min, sec, milli) {
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Some(t) => self.from_local_time(&t),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Time` from hour, minute, second, microsecond and the current offset.
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/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
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///
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/// Fails on invalid hour, minute, second and/or microsecond.
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fn hms_micro(&self, hour: u32, min: u32, sec: u32, micro: u32) -> Time<Self> {
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self.hms_micro_opt(hour, min, sec, micro).unwrap()
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}
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/// Makes a new `Time` from hour, minute, second, microsecond and the current offset.
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/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
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///
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/// Returns `None` on invalid hour, minute, second and/or microsecond.
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fn hms_micro_opt(&self, hour: u32, min: u32, sec: u32, micro: u32) -> LocalResult<Time<Self>> {
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match NaiveTime::from_hms_micro_opt(hour, min, sec, micro) {
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Some(t) => self.from_local_time(&t),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Time` from hour, minute, second, nanosecond and the current offset.
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/// The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.
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///
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/// Fails on invalid hour, minute, second and/or nanosecond.
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fn hms_nano(&self, hour: u32, min: u32, sec: u32, nano: u32) -> Time<Self> {
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self.hms_nano_opt(hour, min, sec, nano).unwrap()
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}
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/// Makes a new `Time` from hour, minute, second, nanosecond and the current offset.
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/// The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.
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///
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/// Returns `None` on invalid hour, minute, second and/or nanosecond.
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fn hms_nano_opt(&self, hour: u32, min: u32, sec: u32, nano: u32) -> LocalResult<Time<Self>> {
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match NaiveTime::from_hms_nano_opt(hour, min, sec, nano) {
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Some(t) => self.from_local_time(&t),
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None => LocalResult::None,
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}
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}
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/// Returns a name or abbreviation of this offset.
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fn name(&self) -> SendStr;
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/// Returns the *current* offset from UTC to the local time.
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fn local_minus_utc(&self) -> Duration;
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/// Converts the local `NaiveDate` to the timezone-aware `Date` if possible.
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fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<Self>>;
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/// Converts the local `NaiveTime` to the timezone-aware `Time` if possible.
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fn from_local_time(&self, local: &NaiveTime) -> LocalResult<Time<Self>>;
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/// Converts the local `NaiveDateTime` to the timezone-aware `DateTime` if possible.
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fn from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<DateTime<Self>>;
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/// Converts the UTC `NaiveDate` to the local time.
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/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
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fn to_local_date(&self, utc: &NaiveDate) -> NaiveDate;
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/// Converts the UTC `NaiveTime` to the local time.
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/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
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fn to_local_time(&self, utc: &NaiveTime) -> NaiveTime;
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/// Converts the UTC `NaiveDateTime` to the local time.
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/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
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fn to_local_datetime(&self, utc: &NaiveDateTime) -> NaiveDateTime;
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}
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/// The UTC timescale. This is the most efficient offset when you don't need the local time.
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#[deriving(Clone, PartialEq, Eq)]
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pub struct UTC;
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impl UTC {
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/// Returns a `Date` which corresponds to the current date.
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pub fn today() -> Date<UTC> { UTC::now().date() }
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/// Returns a `DateTime` which corresponds to the current date.
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pub fn now() -> DateTime<UTC> {
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let spec = stdtime::get_time();
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let naive = NaiveDateTime::from_num_seconds_from_unix_epoch(spec.sec, spec.nsec as u32);
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DateTime::from_utc(naive, UTC)
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}
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}
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impl Offset for UTC {
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fn name(&self) -> SendStr { "UTC".into_cow() }
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fn local_minus_utc(&self) -> Duration { Duration::zero() }
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fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<UTC>> {
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LocalResult::Single(Date::from_utc(local.clone(), UTC))
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}
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fn from_local_time(&self, local: &NaiveTime) -> LocalResult<Time<UTC>> {
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LocalResult::Single(Time::from_utc(local.clone(), UTC))
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}
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fn from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<DateTime<UTC>> {
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LocalResult::Single(DateTime::from_utc(local.clone(), UTC))
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}
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fn to_local_date(&self, utc: &NaiveDate) -> NaiveDate { utc.clone() }
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fn to_local_time(&self, utc: &NaiveTime) -> NaiveTime { utc.clone() }
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fn to_local_datetime(&self, utc: &NaiveDateTime) -> NaiveDateTime { utc.clone() }
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}
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impl fmt::Show for UTC {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Z") }
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}
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/// The fixed offset, from UTC-23:59:59 to UTC+23:59:59.
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#[deriving(Clone, PartialEq, Eq)]
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pub struct FixedOffset {
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local_minus_utc: i32,
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}
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impl FixedOffset {
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/// Makes a new `FixedOffset` for the Eastern Hemisphere with given timezone difference.
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/// The negative `secs` means the Western Hemisphere.
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///
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/// Fails on the out-of-bound `secs`.
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pub fn east(secs: i32) -> FixedOffset {
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FixedOffset::east_opt(secs).expect("FixedOffset::east out of bounds")
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}
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/// Makes a new `FixedOffset` for the Eastern Hemisphere with given timezone difference.
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/// The negative `secs` means the Western Hemisphere.
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///
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/// Returns `None` on the out-of-bound `secs`.
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pub fn east_opt(secs: i32) -> Option<FixedOffset> {
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if -86400 < secs && secs < 86400 {
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Some(FixedOffset { local_minus_utc: secs })
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} else {
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None
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}
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}
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/// Makes a new `FixedOffset` for the Western Hemisphere with given timezone difference.
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/// The negative `secs` means the Eastern Hemisphere.
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///
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/// Fails on the out-of-bound `secs`.
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pub fn west(secs: i32) -> FixedOffset {
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FixedOffset::west_opt(secs).expect("FixedOffset::west out of bounds")
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}
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/// Makes a new `FixedOffset` for the Western Hemisphere with given timezone difference.
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/// The negative `secs` means the Eastern Hemisphere.
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///
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/// Returns `None` on the out-of-bound `secs`.
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pub fn west_opt(secs: i32) -> Option<FixedOffset> {
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if -86400 < secs && secs < 86400 {
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Some(FixedOffset { local_minus_utc: -secs })
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} else {
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None
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}
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}
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}
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impl Offset for FixedOffset {
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fn name(&self) -> SendStr { "UTC".into_cow() } // XXX
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fn local_minus_utc(&self) -> Duration { Duration::seconds(self.local_minus_utc as i64) }
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fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<FixedOffset>> {
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LocalResult::Single(Date::from_utc(local.clone(), self.clone()))
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}
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fn from_local_time(&self, local: &NaiveTime) -> LocalResult<Time<FixedOffset>> {
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let t = Time::from_utc(*local + Duration::seconds(-self.local_minus_utc as i64),
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self.clone());
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LocalResult::Single(t)
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}
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fn from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<DateTime<FixedOffset>> {
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let dt = DateTime::from_utc(*local + Duration::seconds(-self.local_minus_utc as i64),
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self.clone());
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LocalResult::Single(dt)
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}
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fn to_local_date(&self, utc: &NaiveDate) -> NaiveDate {
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utc.clone()
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}
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fn to_local_time(&self, utc: &NaiveTime) -> NaiveTime {
|
|
*utc + Duration::seconds(self.local_minus_utc as i64)
|
|
}
|
|
fn to_local_datetime(&self, utc: &NaiveDateTime) -> NaiveDateTime {
|
|
*utc + Duration::seconds(self.local_minus_utc as i64)
|
|
}
|
|
}
|
|
|
|
impl fmt::Show for FixedOffset {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
|
let offset = self.local_minus_utc;
|
|
let (sign, offset) = if offset < 0 {('-', -offset)} else {('+', offset)};
|
|
let (mins, sec) = div_mod_floor(offset, 60);
|
|
let (hour, min) = div_mod_floor(mins, 60);
|
|
if sec == 0 {
|
|
write!(f, "{}{:02}:{:02}", sign, hour, min)
|
|
} else {
|
|
write!(f, "{}{:02}:{:02}:{:02}", sign, hour, min, sec)
|
|
}
|
|
}
|
|
}
|
|
|
|
/// The local timescale. This is implemented via the standard `time` crate.
|
|
#[deriving(Clone)]
|
|
pub struct Local {
|
|
cached: FixedOffset,
|
|
}
|
|
|
|
impl Local {
|
|
/// Converts a `time::Tm` struct into the timezone-aware `DateTime`.
|
|
/// This assumes that `time` is working correctly, i.e. any error is fatal.
|
|
fn tm_to_datetime(mut tm: stdtime::Tm) -> DateTime<Local> {
|
|
if tm.tm_sec >= 60 {
|
|
tm.tm_sec = 59;
|
|
tm.tm_nsec += (tm.tm_sec - 59) * 1_000_000_000;
|
|
}
|
|
|
|
// from_yo is more efficient than from_ymd (since it's the internal representation).
|
|
let date = NaiveDate::from_yo(tm.tm_year + 1900, tm.tm_yday as u32 + 1);
|
|
let time = NaiveTime::from_hms_nano(tm.tm_hour as u32, tm.tm_min as u32,
|
|
tm.tm_sec as u32, tm.tm_nsec as u32);
|
|
let offset = Local { cached: FixedOffset::east(tm.tm_utcoff) };
|
|
DateTime::from_utc(date.and_time(time) + Duration::seconds(-tm.tm_utcoff as i64), offset)
|
|
}
|
|
|
|
/// Converts a local `NaiveDateTime` to the `time::Timespec`.
|
|
fn datetime_to_timespec(d: &NaiveDateTime) -> stdtime::Timespec {
|
|
let tm = stdtime::Tm {
|
|
tm_sec: d.second() as i32,
|
|
tm_min: d.minute() as i32,
|
|
tm_hour: d.hour() as i32,
|
|
tm_mday: d.day() as i32,
|
|
tm_mon: d.month0() as i32, // yes, C is that strange...
|
|
tm_year: d.year() - 1900, // this doesn't underflow, we know that d is `NaiveDateTime`.
|
|
tm_wday: 0, // to_local ignores this
|
|
tm_yday: 0, // and this
|
|
tm_isdst: -1,
|
|
tm_utcoff: 1, // this is arbitrary but should be nonzero
|
|
// in order to make `to_timespec` use `rust_mktime` internally.
|
|
tm_nsec: d.nanosecond() as i32,
|
|
};
|
|
tm.to_timespec()
|
|
}
|
|
|
|
/// Returns a `Date` which corresponds to the current date.
|
|
pub fn today() -> Date<Local> {
|
|
Local::now().date()
|
|
}
|
|
|
|
/// Returns a `DateTime` which corresponds to the current date.
|
|
pub fn now() -> DateTime<Local> {
|
|
Local::tm_to_datetime(stdtime::now())
|
|
}
|
|
}
|
|
|
|
impl Offset for Local {
|
|
fn name(&self) -> SendStr { "LMT".into_cow() } // XXX XXX
|
|
fn local_minus_utc(&self) -> Duration { self.cached.local_minus_utc() }
|
|
|
|
fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<Local>> {
|
|
match self.from_local_datetime(&local.and_hms(0, 0, 0)) {
|
|
LocalResult::None => LocalResult::None,
|
|
LocalResult::Single(dt) => LocalResult::Single(dt.date()),
|
|
LocalResult::Ambiguous(min, max) => {
|
|
let min = min.date();
|
|
let max = max.date();
|
|
if min == max {LocalResult::Single(min)} else {LocalResult::Ambiguous(min, max)}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn from_local_time(&self, local: &NaiveTime) -> LocalResult<Time<Local>> {
|
|
// XXX we don't have enough information here, so we assume that the timezone remains same
|
|
LocalResult::Single(Time::from_utc(local.clone(), self.clone()))
|
|
}
|
|
|
|
fn from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<DateTime<Local>> {
|
|
let timespec = Local::datetime_to_timespec(local);
|
|
LocalResult::Single(Local::tm_to_datetime(stdtime::at(timespec)))
|
|
}
|
|
|
|
fn to_local_date(&self, utc: &NaiveDate) -> NaiveDate { self.cached.to_local_date(utc) }
|
|
fn to_local_time(&self, utc: &NaiveTime) -> NaiveTime { self.cached.to_local_time(utc) }
|
|
fn to_local_datetime(&self, utc: &NaiveDateTime) -> NaiveDateTime {
|
|
self.cached.to_local_datetime(utc)
|
|
}
|
|
}
|
|
|
|
impl fmt::Show for Local {
|
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { self.cached.fmt(f) }
|
|
}
|
|
|