| 1 | use crate::error::{Error, Result}; |
|---|---|
| 2 | use crate::iter::Iter; |
| 3 | use crate::token; |
| 4 | use proc_macro::Group; |
| 5 | |
| 6 | #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)] |
| 7 | pub struct Release { |
| 8 | pub minor: u16, |
| 9 | pub patch: Option<u16>, |
| 10 | } |
| 11 | |
| 12 | pub fn parse(paren: Group, iter: Iter) -> Result<Release> { |
| 13 | try_parse(iter).map_err(|()| Error::group(group:paren, msg:"expected rustc release number, like 1.31")) |
| 14 | } |
| 15 | |
| 16 | fn try_parse(iter: Iter) -> Result<Release, ()> { |
| 17 | let major_minor: Literal = token::parse_literal(iter).map_err(op:drop)?; |
| 18 | let string: String = major_minor.to_string(); |
| 19 | |
| 20 | if !string.starts_with("1.") { |
| 21 | return Err(()); |
| 22 | } |
| 23 | |
| 24 | let minor: u16 = string[2..].parse().map_err(op:drop)?; |
| 25 | |
| 26 | let patch: Option'.').is_some() { |
| 27 | let int: Literal = token::parse_literal(iter).map_err(op:drop)?; |
| 28 | Some(int.to_string().parse().map_err(op:drop)?) |
| 29 | } else { |
| 30 | None |
| 31 | }; |
| 32 | |
| 33 | Ok(Release { minor, patch }) |
| 34 | } |
| 35 |