rustversion/
date.rs

1use crate::error::{Error, Result};
2use crate::iter::Iter;
3use crate::{time, token};
4use proc_macro::Group;
5use std::fmt::{self, Display};
6
7#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
8pub struct Date {
9    pub year: u16,
10    pub month: u8,
11    pub day: u8,
12}
13
14impl Display for Date {
15    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
16        write!(
17            formatter,
18            "{:04}-{:02}-{:02}",
19            self.year, self.month, self.day,
20        )
21    }
22}
23
24pub fn parse(paren: Group, iter: Iter) -> Result<Date> {
25    try_parse(iter).map_err(|()| {
26        let msg = format!("expected nightly date, like {}", time::today());
27        Error::group(paren, msg)
28    })
29}
30
31fn try_parse(iter: Iter) -> Result<Date, ()> {
32    let year = token::parse_literal(iter).map_err(drop)?;
33    token::parse_punct(iter, '-').map_err(drop)?;
34    let month = token::parse_literal(iter).map_err(drop)?;
35    token::parse_punct(iter, '-').map_err(drop)?;
36    let day = token::parse_literal(iter).map_err(drop)?;
37
38    let year = year.to_string().parse::<u64>().map_err(drop)?;
39    let month = month.to_string().parse::<u64>().map_err(drop)?;
40    let day = day.to_string().parse::<u64>().map_err(drop)?;
41    if year >= 3000 || month > 12 || day > 31 {
42        return Err(());
43    }
44
45    Ok(Date {
46        year: year as u16,
47        month: month as u8,
48        day: day as u8,
49    })
50}
rustversion/date.rs

rustversion/
date.rs
