/
lib.rs
1454 lines (1259 loc) · 44.8 KB
/
lib.rs
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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Simple time handling.
#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
html_favicon_url = "http://www.rust-lang.org/favicon.ico",
html_root_url = "http://doc.rust-lang.org/time/")]
#![feature(core, std_misc)]
#![cfg_attr(test, deny(warnings))]
#![cfg_attr(test, feature(test, collections))]
#[cfg(test)] #[macro_use] extern crate log;
extern crate libc;
#[cfg(feature = "rustc-serialize")]
extern crate "rustc-serialize" as rustc_serialize;
use std::cmp::Ordering;
use std::fmt;
use std::ops::{Add, Sub};
use std::time::Duration;
use self::ParseError::{InvalidDay, InvalidDayOfMonth, InvalidDayOfWeek,
InvalidDayOfYear, InvalidFormatSpecifier, InvalidHour,
InvalidMinute, InvalidMonth, InvalidSecond, InvalidTime,
InvalidYear, InvalidZoneOffset, MissingFormatConverter,
UnexpectedCharacter};
pub use parse::strptime;
mod display;
mod parse;
static NSEC_PER_SEC: i32 = 1_000_000_000;
mod rustrt {
use super::Tm;
extern {
pub fn rust_time_tzset();
pub fn rust_time_gmtime(sec: i64, nsec: i32, result: &mut Tm);
pub fn rust_time_localtime(sec: i64, nsec: i32, result: &mut Tm);
pub fn rust_time_timegm(tm: &Tm) -> i64;
pub fn rust_time_mktime(tm: &Tm) -> i64;
}
}
#[cfg(all(unix, not(target_os = "macos"), not(target_os = "ios")))]
mod imp {
use libc::{c_int, timespec};
// Apparently android provides this in some other library?
#[cfg(all(not(target_os = "android"),
not(target_os = "nacl")))]
#[link(name = "rt")]
extern {}
extern {
pub fn clock_gettime(clk_id: c_int, tp: *mut timespec) -> c_int;
}
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
mod imp {
use libc::{timeval, timezone, c_int, mach_timebase_info};
use std::sync::{Once, ONCE_INIT};
extern {
pub fn gettimeofday(tp: *mut timeval, tzp: *mut timezone) -> c_int;
pub fn mach_absolute_time() -> u64;
pub fn mach_timebase_info(info: *mut mach_timebase_info) -> c_int;
}
pub fn info() -> &'static mach_timebase_info {
static mut INFO: mach_timebase_info = mach_timebase_info {
numer: 0,
denom: 0,
};
static ONCE: Once = ONCE_INIT;
unsafe {
ONCE.call_once(|| {
mach_timebase_info(&mut INFO);
});
&INFO
}
}
}
#[cfg(windows)]
mod imp {
use libc;
use std::sync::{Once, ONCE_INIT};
pub fn frequency() -> libc::LARGE_INTEGER {
static mut FREQUENCY: libc::LARGE_INTEGER = 0;
static ONCE: Once = ONCE_INIT;
unsafe {
ONCE.call_once(|| {
libc::QueryPerformanceFrequency(&mut FREQUENCY);
});
FREQUENCY
}
}
}
/// A record specifying a time value in seconds and nanoseconds.
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug)]
#[cfg_attr(feature = "rustc-serialize", derive(RustcEncodable, RustcDecodable))]
pub struct Timespec { pub sec: i64, pub nsec: i32 }
/*
* Timespec assumes that pre-epoch Timespecs have negative sec and positive
* nsec fields. Darwin's and Linux's struct timespec functions handle pre-
* epoch timestamps using a "two steps back, one step forward" representation,
* though the man pages do not actually document this. For example, the time
* -1.2 seconds before the epoch is represented by `Timespec { sec: -2_i64,
* nsec: 800_000_000 }`.
*/
impl Timespec {
pub fn new(sec: i64, nsec: i32) -> Timespec {
assert!(nsec >= 0 && nsec < NSEC_PER_SEC);
Timespec { sec: sec, nsec: nsec }
}
}
impl Add<Duration> for Timespec {
type Output = Timespec;
fn add(self, other: Duration) -> Timespec {
let d_sec = other.num_seconds();
// It is safe to unwrap the nanoseconds, because there cannot be
// more than one second left, which fits in i64 and in i32.
let d_nsec = (other - Duration::seconds(d_sec))
.num_nanoseconds().unwrap() as i32;
let mut sec = self.sec + d_sec;
let mut nsec = self.nsec + d_nsec;
if nsec >= NSEC_PER_SEC {
nsec -= NSEC_PER_SEC;
sec += 1;
} else if nsec < 0 {
nsec += NSEC_PER_SEC;
sec -= 1;
}
Timespec::new(sec, nsec)
}
}
impl Sub<Duration> for Timespec {
type Output = Timespec;
fn sub(self, other: Duration) -> Timespec {
let d_sec = other.num_seconds();
// It is safe to unwrap the nanoseconds, because there cannot be
// more than one second left, which fits in i64 and in i32.
let d_nsec = (other - Duration::seconds(d_sec))
.num_nanoseconds().unwrap() as i32;
let mut sec = self.sec - d_sec;
let mut nsec = self.nsec - d_nsec;
if nsec >= NSEC_PER_SEC {
nsec -= NSEC_PER_SEC;
sec += 1;
} else if nsec < 0 {
nsec += NSEC_PER_SEC;
sec -= 1;
}
Timespec::new(sec, nsec)
}
}
impl Sub<Timespec> for Timespec {
type Output = Duration;
fn sub(self, other: Timespec) -> Duration {
let sec = self.sec - other.sec;
let nsec = self.nsec - other.nsec;
Duration::seconds(sec) + Duration::nanoseconds(nsec as i64)
}
}
/**
* Returns the current time as a `timespec` containing the seconds and
* nanoseconds since 1970-01-01T00:00:00Z.
*/
pub fn get_time() -> Timespec {
unsafe {
let (sec, nsec) = os_get_time();
return Timespec::new(sec, nsec);
}
#[cfg(windows)]
unsafe fn os_get_time() -> (i64, i32) {
static NANOSECONDS_FROM_1601_TO_1970: u64 = 11644473600000000;
let mut time = libc::FILETIME {
dwLowDateTime: 0,
dwHighDateTime: 0,
};
libc::GetSystemTimeAsFileTime(&mut time);
// A FILETIME contains a 64-bit value representing the number of
// hectonanosecond (100-nanosecond) intervals since 1601-01-01T00:00:00Z.
// http://support.microsoft.com/kb/167296/en-us
let ns_since_1601 = (((time.dwHighDateTime as u64) << 32) |
((time.dwLowDateTime as u64) << 0)) / 10;
let ns_since_1970 = ns_since_1601 - NANOSECONDS_FROM_1601_TO_1970;
((ns_since_1970 / 1000000) as i64,
((ns_since_1970 % 1000000) * 1000) as i32)
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
unsafe fn os_get_time() -> (i64, i32) {
use std::ptr;
let mut tv = libc::timeval { tv_sec: 0, tv_usec: 0 };
imp::gettimeofday(&mut tv, ptr::null_mut());
(tv.tv_sec as i64, tv.tv_usec * 1000)
}
#[cfg(not(any(target_os = "macos", target_os = "ios", windows)))]
unsafe fn os_get_time() -> (i64, i32) {
let mut tv = libc::timespec { tv_sec: 0, tv_nsec: 0 };
imp::clock_gettime(libc::CLOCK_REALTIME, &mut tv);
(tv.tv_sec as i64, tv.tv_nsec as i32)
}
}
/**
* Returns the current value of a high-resolution performance counter
* in nanoseconds since an unspecified epoch.
*/
pub fn precise_time_ns() -> u64 {
return os_precise_time_ns();
#[cfg(windows)]
fn os_precise_time_ns() -> u64 {
let mut ticks = 0;
assert_eq!(unsafe {
libc::QueryPerformanceCounter(&mut ticks)
}, 1);
return (ticks as u64 * 1000000000) / (imp::frequency() as u64);
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
fn os_precise_time_ns() -> u64 {
unsafe {
let time = imp::mach_absolute_time();
let info = imp::info();
time * info.numer as u64 / info.denom as u64
}
}
#[cfg(not(any(windows, target_os = "macos", target_os = "ios")))]
fn os_precise_time_ns() -> u64 {
let mut ts = libc::timespec { tv_sec: 0, tv_nsec: 0 };
unsafe {
imp::clock_gettime(libc::CLOCK_MONOTONIC, &mut ts);
}
return (ts.tv_sec as u64) * 1000000000 + (ts.tv_nsec as u64)
}
}
/**
* Returns the current value of a high-resolution performance counter
* in seconds since an unspecified epoch.
*/
pub fn precise_time_s() -> f64 {
return (precise_time_ns() as f64) / 1000000000.;
}
/// An opaque structure representing a moment in time.
///
/// The only operation that can be performed on a `PreciseTime` is the
/// calculation of the `Duration` of time that lies between them.
///
/// # Examples
///
/// Repeatedly call a function for 1 second:
///
/// ```rust
/// use std::time::Duration;
/// use time::PreciseTime;
/// # fn do_some_work() {}
///
/// let start = PreciseTime::now();
///
/// while start.to(PreciseTime::now()) < Duration::seconds(1) {
/// do_some_work();
/// }
/// ```
#[deprecated = "use SteadyTime instead"]
#[derive(Copy, Clone)]
pub struct PreciseTime(u64);
impl PreciseTime {
/// Returns a `PreciseTime` representing the current moment in time.
pub fn now() -> PreciseTime {
PreciseTime(precise_time_ns())
}
/// Returns a `Duration` representing the span of time from the value of
/// `self` to the value of `later`.
///
/// # Notes
///
/// If `later` represents a time before `self`, the result of this method
/// is unspecified.
///
/// If `later` represents a time more than 293 years after `self`, the
/// result of this method is unspecified.
#[inline]
pub fn to(&self, later: PreciseTime) -> Duration {
// NB: even if later is less than self due to overflow, this will work
// since the subtraction will underflow properly as well.
//
// We could deal with the overflow when casting to an i64, but all that
// gets us is the ability to handle intervals of up to 584 years, which
// seems not very useful :)
Duration::nanoseconds((later.0 - self.0) as i64)
}
}
/// A structure representing a moment in time.
///
/// `SteadyTime`s are generated by a "steady" clock, that is, a clock which
/// never experiences discontinuous jumps and for which time always flows at
/// the same rate.
///
/// # Examples
///
/// Repeatedly call a function for 1 second:
///
/// ```rust
/// # use time::SteadyTime;
/// # use std::time::Duration;
/// # fn do_some_work() {}
/// let start = SteadyTime::now();
///
/// while SteadyTime::now() - start < Duration::seconds(1) {
/// do_some_work();
/// }
/// ```
#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug)]
pub struct SteadyTime(steady::SteadyTime);
impl SteadyTime {
/// Returns a `SteadyTime` representing the current moment in time.
pub fn now() -> SteadyTime {
SteadyTime(steady::SteadyTime::now())
}
}
impl fmt::Display for SteadyTime {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
// TODO: needs a display customization
fmt::Debug::fmt(self, fmt)
}
}
impl Sub for SteadyTime {
type Output = Duration;
fn sub(self, other: SteadyTime) -> Duration {
self.0 - other.0
}
}
impl Sub<Duration> for SteadyTime {
type Output = SteadyTime;
fn sub(self, other: Duration) -> SteadyTime {
SteadyTime(self.0 - other)
}
}
impl Add<Duration> for SteadyTime {
type Output = SteadyTime;
fn add(self, other: Duration) -> SteadyTime {
SteadyTime(self.0 + other)
}
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
mod steady {
use imp;
use std::time::Duration;
use std::ops::{Sub, Add};
#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug)]
pub struct SteadyTime {
t: u64,
}
impl SteadyTime {
pub fn now() -> SteadyTime {
SteadyTime {
t: unsafe { imp::mach_absolute_time() },
}
}
}
impl Sub for SteadyTime {
type Output = Duration;
fn sub(self, other: SteadyTime) -> Duration {
let info = imp::info();
let diff = self.t as i64 - other.t as i64;
Duration::nanoseconds(diff * info.numer as i64 / info.denom as i64)
}
}
impl Sub<Duration> for SteadyTime {
type Output = SteadyTime;
fn sub(self, other: Duration) -> SteadyTime {
self + -other
}
}
impl Add<Duration> for SteadyTime {
type Output = SteadyTime;
fn add(self, other: Duration) -> SteadyTime {
let info = imp::info();
let delta = other.num_nanoseconds().unwrap() * info.denom as i64 / info.numer as i64;
SteadyTime {
t: (self.t as i64 + delta) as u64
}
}
}
}
#[cfg(not(any(windows, target_os = "macos", target_os = "ios")))]
mod steady {
use {imp, NSEC_PER_SEC};
use libc;
use std::cmp::{PartialOrd, Ord, Ordering, PartialEq, Eq};
use std::ops::{Sub, Add};
use std::time::Duration;
use std::fmt;
#[derive(Copy)]
pub struct SteadyTime {
t: libc::timespec,
}
impl fmt::Debug for SteadyTime {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "SteadyTime {{ tv_sec: {:?}, tv_nsec: {:?} }}",
self.t.tv_sec, self.t.tv_nsec)
}
}
impl Clone for SteadyTime {
fn clone(&self) -> SteadyTime {
SteadyTime { t: self.t }
}
}
impl SteadyTime {
pub fn now() -> SteadyTime {
let mut t = SteadyTime {
t: libc::timespec {
tv_sec: 0,
tv_nsec: 0,
}
};
unsafe {
assert_eq!(0, imp::clock_gettime(libc::CLOCK_MONOTONIC, &mut t.t));
}
t
}
}
impl Sub for SteadyTime {
type Output = Duration;
fn sub(self, other: SteadyTime) -> Duration {
if self.t.tv_nsec >= other.t.tv_nsec {
Duration::seconds(self.t.tv_sec as i64 - other.t.tv_sec as i64) +
Duration::nanoseconds(self.t.tv_nsec as i64 - other.t.tv_nsec as i64)
} else {
Duration::seconds(self.t.tv_sec as i64 - 1 - other.t.tv_sec as i64) +
Duration::nanoseconds(self.t.tv_nsec as i64 + NSEC_PER_SEC as i64 -
other.t.tv_nsec as i64)
}
}
}
impl Sub<Duration> for SteadyTime {
type Output = SteadyTime;
fn sub(self, other: Duration) -> SteadyTime {
self + -other
}
}
impl Add<Duration> for SteadyTime {
type Output = SteadyTime;
fn add(mut self, other: Duration) -> SteadyTime {
let seconds = other.num_seconds();
let nanoseconds = (other - Duration::seconds(seconds)).num_nanoseconds().unwrap();
self.t.tv_sec += seconds as libc::time_t;
self.t.tv_nsec += nanoseconds as libc::c_long;
if self.t.tv_nsec >= NSEC_PER_SEC as libc::c_long {
self.t.tv_nsec -= NSEC_PER_SEC as libc::c_long;
self.t.tv_sec += 1;
} else if self.t.tv_nsec < 0 {
self.t.tv_sec -= 1;
self.t.tv_nsec += NSEC_PER_SEC as libc::c_long;
}
self
}
}
impl PartialOrd for SteadyTime {
fn partial_cmp(&self, other: &SteadyTime) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for SteadyTime {
fn cmp(&self, other: &SteadyTime) -> Ordering {
match self.t.tv_sec.cmp(&other.t.tv_sec) {
Ordering::Equal => self.t.tv_nsec.cmp(&other.t.tv_nsec),
ord => ord
}
}
}
impl PartialEq for SteadyTime {
fn eq(&self, other: &SteadyTime) -> bool {
self.t.tv_sec == other.t.tv_sec && self.t.tv_nsec == other.t.tv_nsec
}
}
impl Eq for SteadyTime {}
}
#[cfg(windows)]
mod steady {
use imp;
use libc;
use std::ops::{Sub, Add};
use std::time::Duration;
#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug)]
pub struct SteadyTime {
t: libc::LARGE_INTEGER,
}
impl SteadyTime {
pub fn now() -> SteadyTime {
let mut t = SteadyTime { t: 0 };
unsafe { libc::QueryPerformanceCounter(&mut t.t); }
t
}
}
impl Sub for SteadyTime {
type Output = Duration;
fn sub(self, other: SteadyTime) -> Duration {
let diff = self.t as i64 - other.t as i64;
Duration::microseconds(diff * 1_000_000 / imp::frequency() as i64)
}
}
impl Sub<Duration> for SteadyTime {
type Output = SteadyTime;
fn sub(self, other: Duration) -> SteadyTime {
self + -other
}
}
impl Add<Duration> for SteadyTime {
type Output = SteadyTime;
fn add(mut self, other: Duration) -> SteadyTime {
self.t += (other.num_microseconds().unwrap() * imp::frequency() as i64 / 1_000_000)
as libc::LARGE_INTEGER;
self
}
}
}
pub fn tzset() {
unsafe {
rustrt::rust_time_tzset();
}
}
/// Holds a calendar date and time broken down into its components (year, month,
/// day, and so on), also called a broken-down time value.
// FIXME: use c_int instead of i32?
#[repr(C)]
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct Tm {
/// Seconds after the minute - [0, 60]
pub tm_sec: i32,
/// Minutes after the hour - [0, 59]
pub tm_min: i32,
/// Hours after midnight - [0, 23]
pub tm_hour: i32,
/// Day of the month - [1, 31]
pub tm_mday: i32,
/// Months since January - [0, 11]
pub tm_mon: i32,
/// Years since 1900
pub tm_year: i32,
/// Days since Sunday - [0, 6]. 0 = Sunday, 1 = Monday, ..., 6 = Saturday.
pub tm_wday: i32,
/// Days since January 1 - [0, 365]
pub tm_yday: i32,
/// Daylight Saving Time flag.
///
/// This value is positive if Daylight Saving Time is in effect, zero if
/// Daylight Saving Time is not in effect, and negative if this information
/// is not available.
pub tm_isdst: i32,
/// Identifies the time zone that was used to compute this broken-down time
/// value, including any adjustment for Daylight Saving Time. This is the
/// number of seconds east of UTC. For example, for U.S. Pacific Daylight
/// Time, the value is -7*60*60 = -25200.
pub tm_utcoff: i32,
/// Nanoseconds after the second - [0, 10<sup>9</sup> - 1]
pub tm_nsec: i32,
}
impl Add<Duration> for Tm {
type Output = Tm;
/// The resulting Tm is in UTC.
// FIXME: The resulting Tm should have the same timezone as `self`;
// however, we need a function such as `at_tm(clock: Timespec, offset: i32)`
// for this.
fn add(self, other: Duration) -> Tm {
at_utc(self.to_timespec() + other)
}
}
impl Sub<Duration> for Tm {
type Output = Tm;
/// The resulting Tm is in UTC.
// FIXME: The resulting Tm should have the same timezone as `self`;
// however, we need a function such as `at_tm(clock: Timespec, offset: i32)`
// for this.
fn sub(self, other: Duration) -> Tm {
at_utc(self.to_timespec() - other)
}
}
impl PartialOrd for Tm {
fn partial_cmp(&self, other: &Tm) -> Option<Ordering> {
self.to_timespec().partial_cmp(&other.to_timespec())
}
}
impl Ord for Tm {
fn cmp(&self, other: &Tm) -> Ordering {
self.to_timespec().cmp(&other.to_timespec())
}
}
pub fn empty_tm() -> Tm {
Tm {
tm_sec: 0,
tm_min: 0,
tm_hour: 0,
tm_mday: 0,
tm_mon: 0,
tm_year: 0,
tm_wday: 0,
tm_yday: 0,
tm_isdst: 0,
tm_utcoff: 0,
tm_nsec: 0,
}
}
/// Returns the specified time in UTC
pub fn at_utc(clock: Timespec) -> Tm {
unsafe {
let Timespec { sec, nsec } = clock;
let mut tm = empty_tm();
rustrt::rust_time_gmtime(sec, nsec, &mut tm);
tm
}
}
/// Returns the current time in UTC
pub fn now_utc() -> Tm {
at_utc(get_time())
}
/// Returns the specified time in the local timezone
pub fn at(clock: Timespec) -> Tm {
unsafe {
let Timespec { sec, nsec } = clock;
let mut tm = empty_tm();
rustrt::rust_time_localtime(sec, nsec, &mut tm);
tm
}
}
/// Returns the current time in the local timezone
pub fn now() -> Tm {
at(get_time())
}
impl Tm {
/// Convert time to the seconds from January 1, 1970
pub fn to_timespec(&self) -> Timespec {
unsafe {
let sec = match self.tm_utcoff {
0 => rustrt::rust_time_timegm(self),
_ => rustrt::rust_time_mktime(self)
};
Timespec::new(sec, self.tm_nsec)
}
}
/// Convert time to the local timezone
pub fn to_local(&self) -> Tm {
at(self.to_timespec())
}
/// Convert time to the UTC
pub fn to_utc(&self) -> Tm {
at_utc(self.to_timespec())
}
/**
* Returns a TmFmt that outputs according to the `asctime` format in ISO
* C, in the local timezone.
*
* Example: "Thu Jan 1 00:00:00 1970"
*/
pub fn ctime(&self) -> TmFmt {
TmFmt {
tm: self,
format: Fmt::Ctime,
}
}
/**
* Returns a TmFmt that outputs according to the `asctime` format in ISO
* C.
*
* Example: "Thu Jan 1 00:00:00 1970"
*/
pub fn asctime(&self) -> TmFmt {
TmFmt {
tm: self,
format: Fmt::Str("%c"),
}
}
/// Formats the time according to the format string.
pub fn strftime<'a>(&'a self, format: &'a str) -> Result<TmFmt<'a>, ParseError> {
validate_format(TmFmt {
tm: self,
format: Fmt::Str(format),
})
}
/**
* Returns a TmFmt that outputs according to RFC 822.
*
* local: "Thu, 22 Mar 2012 07:53:18 PST"
* utc: "Thu, 22 Mar 2012 14:53:18 GMT"
*/
pub fn rfc822(&self) -> TmFmt {
let fmt = if self.tm_utcoff == 0 {
"%a, %d %b %Y %T GMT"
} else {
"%a, %d %b %Y %T %Z"
};
TmFmt {
tm: self,
format: Fmt::Str(fmt),
}
}
/**
* Returns a TmFmt that outputs according to RFC 822 with Zulu time.
*
* local: "Thu, 22 Mar 2012 07:53:18 -0700"
* utc: "Thu, 22 Mar 2012 14:53:18 -0000"
*/
pub fn rfc822z(&self) -> TmFmt {
TmFmt {
tm: self,
format: Fmt::Str("%a, %d %b %Y %T %z"),
}
}
/**
* Returns a TmFmt that outputs according to RFC 3339. RFC 3339 is
* compatible with ISO 8601.
*
* local: "2012-02-22T07:53:18-07:00"
* utc: "2012-02-22T14:53:18Z"
*/
pub fn rfc3339<'a>(&'a self) -> TmFmt {
TmFmt {
tm: self,
format: Fmt::Rfc3339,
}
}
}
#[derive(Copy, PartialEq, Debug)]
pub enum ParseError {
InvalidSecond,
InvalidMinute,
InvalidHour,
InvalidDay,
InvalidMonth,
InvalidYear,
InvalidDayOfWeek,
InvalidDayOfMonth,
InvalidDayOfYear,
InvalidZoneOffset,
InvalidTime,
MissingFormatConverter,
InvalidFormatSpecifier(char),
UnexpectedCharacter(char, char),
}
impl fmt::Display for ParseError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
InvalidSecond => write!(f, "Invalid second."),
InvalidMinute => write!(f, "Invalid minute."),
InvalidHour => write!(f, "Invalid hour."),
InvalidDay => write!(f, "Invalid day."),
InvalidMonth => write!(f, "Invalid month."),
InvalidYear => write!(f, "Invalid year."),
InvalidDayOfWeek => write!(f, "Invalid day of the week."),
InvalidDayOfMonth => write!(f, "Invalid day of the month."),
InvalidDayOfYear => write!(f, "Invalid day of the year."),
InvalidZoneOffset => write!(f, "Invalid zone offset."),
InvalidTime => write!(f, "Invalid time."),
MissingFormatConverter => {
write!(f, "missing format converter after `%`")
}
InvalidFormatSpecifier(ch) => {
write!(f, "invalid format specifier: %{}", ch)
}
UnexpectedCharacter(a, b) => {
write!(f, "expected: `{}`, found: `{}`", a, b)
}
}
}
}
/// A wrapper around a `Tm` and format string that implements Display.
#[derive(Debug)]
pub struct TmFmt<'a> {
tm: &'a Tm,
format: Fmt<'a>
}
#[derive(Debug)]
enum Fmt<'a> {
Str(&'a str),
Rfc3339,
Ctime,
}
fn validate_format<'a>(fmt: TmFmt<'a>) -> Result<TmFmt<'a>, ParseError> {
match (fmt.tm.tm_wday, fmt.tm.tm_mon) {
(0...6, 0...11) => (),
(_wday, 0...11) => return Err(InvalidDayOfWeek),
(0...6, _mon) => return Err(InvalidMonth),
_ => return Err(InvalidDay)
}
match fmt.format {
Fmt::Str(ref s) => {
let mut chars = s.chars();
loop {
match chars.next() {
Some('%') => {
match chars.next() {
Some('A') | Some('a') | Some('B') | Some('b') |
Some('C') | Some('c') | Some('D') | Some('d') |
Some('e') | Some('F') | Some('f') | Some('G') |
Some('g') | Some('H') | Some('h') | Some('I') |
Some('j') | Some('k') | Some('l') | Some('M') |
Some('m') | Some('n') | Some('P') | Some('p') |
Some('R') | Some('r') | Some('S') | Some('s') |
Some('T') | Some('t') | Some('U') | Some('u') |
Some('V') | Some('v') | Some('W') | Some('w') |
Some('X') | Some('x') | Some('Y') | Some('y') |
Some('Z') | Some('z') | Some('+') | Some('%') => (),
Some(c) => return Err(InvalidFormatSpecifier(c)),
None => return Err(MissingFormatConverter),
}
},
None => break,
_ => ()
}
}
},
_ => ()
}
Ok(fmt)
}
/// Formats the time according to the format string.
pub fn strftime(format: &str, tm: &Tm) -> Result<String, ParseError> {
tm.strftime(format).map(|fmt| fmt.to_string())
}
#[cfg(test)]
mod tests {
extern crate test;
use super::{Timespec, get_time, precise_time_ns, precise_time_s, tzset,
at_utc, at, strptime, PreciseTime, ParseError};
use super::ParseError::{InvalidTime, InvalidYear, MissingFormatConverter,
InvalidFormatSpecifier};
use std::f64;
use std::time::Duration;
use self::test::Bencher;
#[cfg(windows)]
fn set_time_zone() {
use libc;
use std::ffi::CString;
// Windows crt doesn't see any environment variable set by
// `SetEnvironmentVariable`, which `os::setenv` internally uses.
// It is why we use `putenv` here.
extern {
fn _putenv(envstring: *const libc::c_char) -> libc::c_int;
}
unsafe {
// Windows does not understand "America/Los_Angeles".
// PST+08 may look wrong, but not! "PST" indicates
// the name of timezone. "+08" means UTC = local + 08.
let c = CString::from_slice(b"TZ=PST+08");
_putenv(c.as_ptr());
}
tzset();
}
#[cfg(not(windows))]
fn set_time_zone() {
use std::env;
env::set_var("TZ", "America/Los_Angeles");
tzset();
}
fn test_get_time() {
static SOME_RECENT_DATE: i64 = 1325376000i64; // 2012-01-01T00:00:00Z
static SOME_FUTURE_DATE: i64 = 1577836800i64; // 2020-01-01T00:00:00Z
let tv1 = get_time();
debug!("tv1={} sec + {} nsec", tv1.sec, tv1.nsec);
assert!(tv1.sec > SOME_RECENT_DATE);
assert!(tv1.nsec < 1000000000i32);
let tv2 = get_time();
debug!("tv2={} sec + {} nsec", tv2.sec, tv2.nsec);
assert!(tv2.sec >= tv1.sec);
assert!(tv2.sec < SOME_FUTURE_DATE);
assert!(tv2.nsec < 1000000000i32);
if tv2.sec == tv1.sec {
assert!(tv2.nsec >= tv1.nsec);