datetime/cal/fmt/
iso.rs

1use std::fmt;
2use cal::{LocalDate, LocalTime, LocalDateTime, DatePiece, TimePiece};
3use cal::{Offset, OffsetDateTime};
4use util::RangeExt;
5
6
7pub trait ISO: Sized {
8    fn iso(&self) -> ISOString<Self> {
9        ISOString(self)
10    }
11
12    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result;
13}
14
15#[derive(Debug)]
16pub struct ISOString<'a, T: 'a>(&'a T);
17
18impl<'a, T> fmt::Display for ISOString<'a, T>
19where T: ISO {
20    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
21        ISO::fmt(self.0, f)
22    }
23}
24
25impl ISO for LocalDate {
26    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
27        let year = self.year();
28        if year.is_within(0 .. 9999) {
29            write!(f, "{:04}-{:02}-{:02}", year, self.month() as usize, self.day())
30        }
31        else {
32            write!(f, "{:+05}-{:02}-{:02}", year, self.month() as usize, self.day())
33        }
34    }
35}
36
37impl ISO for LocalTime {
38    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
39        write!(f, "{:02}:{:02}:{:02}.{:03}", self.hour(), self.minute(), self.second(), self.millisecond())
40    }
41}
42
43impl ISO for LocalDateTime {
44    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
45        self.date().fmt(f)?;
46        write!(f, "T")?;
47        self.time().fmt(f)
48    }
49}
50
51impl ISO for Offset {
52    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
53        if self.is_utc() {
54            write!(f, "Z")
55        }
56        else {
57            f.write_str(if self.is_negative() { "-" } else { "+" })?;
58
59            match (self.hours(), self.minutes(), self.seconds()) {
60                (h, 0, 0) => write!(f, "{:02}", h.abs()),
61                (h, m, 0) => write!(f, "{:02}:{:02}", h.abs(), m.abs()),
62                (h, m, s) => write!(f, "{:02}:{:02}:{:02}", h.abs(), m.abs(), s.abs()),
63            }
64        }
65    }
66}
67
68impl ISO for OffsetDateTime {
69    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
70        write!(f, "{}{}", self.local.iso(), self.offset.iso())
71    }
72}
datetime/cal/fmt/iso.rs

datetime/cal/fmt/
iso.rs
