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use crate::error::{Error, Result};
use crate::iter::Iter;
use crate::{time, token};
use proc_macro::Group;
use std::fmt::{self, Display};
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Date {
pub year: u16,
pub month: u8,
pub day: u8,
}
impl Display for Date {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(
formatter,
"{:04}-{:02}-{:02}",
self.year, self.month, self.day,
)
}
}
pub fn parse(paren: Group, iter: Iter) -> Result<Date> {
try_parse(iter).map_err(|()| {
let msg = format!("expected nightly date, like {}", time::today());
Error::group(paren, msg)
})
}
fn try_parse(iter: Iter) -> Result<Date, ()> {
let year = token::parse_literal(iter).map_err(drop)?;
token::parse_punct(iter, '-').map_err(drop)?;
let month = token::parse_literal(iter).map_err(drop)?;
token::parse_punct(iter, '-').map_err(drop)?;
let day = token::parse_literal(iter).map_err(drop)?;
let year = year.to_string().parse::<u64>().map_err(drop)?;
let month = month.to_string().parse::<u64>().map_err(drop)?;
let day = day.to_string().parse::<u64>().map_err(drop)?;
if year >= 3000 || month > 12 || day > 31 {
return Err(());
}
Ok(Date {
year: year as u16,
month: month as u8,
day: day as u8,
})
}
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