rustversion/
bound.rs

1use crate::date::{self, Date};
2use crate::error::{Error, Result};
3use crate::iter::Iter;
4use crate::release::{self, Release};
5use crate::time;
6use crate::version::{Channel::*, Version};
7use proc_macro::{Group, TokenTree};
8use std::cmp::Ordering;
9
10pub enum Bound {
11    Nightly(Date),
12    Stable(Release),
13}
14
15pub fn parse(paren: Group, iter: Iter) -> Result<Bound> {
16    if let Some(TokenTree::Literal(literal)) = iter.peek() {
17        let repr = literal.to_string();
18        if repr.starts_with(|ch: char| ch.is_ascii_digit()) {
19            if repr.contains('.') {
20                return release::parse(paren, iter).map(Bound::Stable);
21            } else {
22                return date::parse(paren, iter).map(Bound::Nightly);
23            }
24        }
25    }
26    let msg = format!(
27        "expected rustc release number like 1.31, or nightly date like {}",
28        time::today(),
29    );
30    Err(Error::group(paren, msg))
31}
32
33impl PartialEq<Bound> for Version {
34    fn eq(&self, rhs: &Bound) -> bool {
35        match rhs {
36            Bound::Nightly(date) => match self.channel {
37                Stable | Beta | Dev => false,
38                Nightly(nightly) => nightly == *date,
39            },
40            Bound::Stable(release) => {
41                self.minor == release.minor
42                    && release.patch.map_or(true, |patch| self.patch == patch)
43            }
44        }
45    }
46}
47
48impl PartialOrd<Bound> for Version {
49    fn partial_cmp(&self, rhs: &Bound) -> Option<Ordering> {
50        match rhs {
51            Bound::Nightly(date) => match self.channel {
52                Stable | Beta => Some(Ordering::Less),
53                Nightly(nightly) => Some(nightly.cmp(date)),
54                Dev => Some(Ordering::Greater),
55            },
56            Bound::Stable(release) => {
57                let version = (self.minor, self.patch);
58                let bound = (release.minor, release.patch.unwrap_or(0));
59                Some(version.cmp(&bound))
60            }
61        }
62    }
63}
rustversion/bound.rs

rustversion/
bound.rs
