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: String = format!("expected nightly date, like {}", time::today());
27 Error::group(group:paren, msg)
28 })
29}
30
31fn try_parse(iter: Iter) -> Result<Date, ()> {
32 let year: Literal = token::parse_literal(iter).map_err(op:drop)?;
33 token::parse_punct(iter, '-').map_err(op:drop)?;
34 let month: Literal = token::parse_literal(iter).map_err(op:drop)?;
35 token::parse_punct(iter, '-').map_err(op:drop)?;
36 let day: Literal = token::parse_literal(iter).map_err(op:drop)?;
37
38 let year: u64 = year.to_string().parse::<u64>().map_err(op:drop)?;
39 let month: u64 = month.to_string().parse::<u64>().map_err(op:drop)?;
40 let day: u64 = day.to_string().parse::<u64>().map_err(op: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}
51