| 1 | use crate::error::{Error, Result}; |
|---|---|
| 2 | use crate::iter::Iter; |
| 3 | use crate::{time, token}; |
| 4 | use proc_macro::Group; |
| 5 | use std::fmt::{self, Display}; |
| 6 | |
| 7 | #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)] |
| 8 | pub struct Date { |
| 9 | pub year: u16, |
| 10 | pub month: u8, |
| 11 | pub day: u8, |
| 12 | } |
| 13 | |
| 14 | impl 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 | |
| 24 | pub 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 | |
| 31 | fn 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 |