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use std::fmt;
use div::div_mod_floor;
use duration::Duration;
use naive::date::NaiveDate;
use naive::datetime::NaiveDateTime;
use super::{TimeZone, Offset, LocalResult};
#[derive(Copy, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "rustc-serialize", derive(RustcEncodable, RustcDecodable))]
pub struct FixedOffset {
local_minus_utc: i32,
}
impl FixedOffset {
pub fn east(secs: i32) -> FixedOffset {
FixedOffset::east_opt(secs).expect("FixedOffset::east out of bounds")
}
pub fn east_opt(secs: i32) -> Option<FixedOffset> {
if -86400 < secs && secs < 86400 {
Some(FixedOffset { local_minus_utc: secs })
} else {
None
}
}
pub fn west(secs: i32) -> FixedOffset {
FixedOffset::west_opt(secs).expect("FixedOffset::west out of bounds")
}
pub fn west_opt(secs: i32) -> Option<FixedOffset> {
if -86400 < secs && secs < 86400 {
Some(FixedOffset { local_minus_utc: -secs })
} else {
None
}
}
}
impl TimeZone for FixedOffset {
type Offset = FixedOffset;
fn from_offset(offset: &FixedOffset) -> FixedOffset { offset.clone() }
fn offset_from_local_date(&self, _local: &NaiveDate) -> LocalResult<FixedOffset> {
LocalResult::Single(self.clone())
}
fn offset_from_local_datetime(&self, _local: &NaiveDateTime) -> LocalResult<FixedOffset> {
LocalResult::Single(self.clone())
}
fn offset_from_utc_date(&self, _utc: &NaiveDate) -> FixedOffset { self.clone() }
fn offset_from_utc_datetime(&self, _utc: &NaiveDateTime) -> FixedOffset { self.clone() }
}
impl Offset for FixedOffset {
fn local_minus_utc(&self) -> Duration { Duration::seconds(self.local_minus_utc as i64) }
}
impl fmt::Debug 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)
}
}
}
impl fmt::Display for FixedOffset {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Debug::fmt(self, f) }
}