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use crate::date::Date;
use crate::version::{Channel::*, Version};
use quote::quote;
use std::cmp::Ordering;
use syn::parse::{Error, Parse, ParseStream, Result};
use syn::{LitFloat, LitInt, Token};
pub enum Bound {
Nightly(Date),
Stable(Release),
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Release {
pub minor: u16,
pub patch: Option<u16>,
}
impl Parse for Bound {
fn parse(input: ParseStream) -> Result<Self> {
if input.peek2(Token![-]) {
input.parse().map(Bound::Nightly)
} else {
input.parse().map(Bound::Stable)
}
}
}
impl Parse for Release {
fn parse(input: ParseStream) -> Result<Self> {
let span = input.cursor().token_stream();
let error = || Error::new_spanned(&span, "expected rustc release number, like 1.31");
let major_minor: LitFloat = input.parse().map_err(|_| error())?;
let string = quote!(#major_minor).to_string();
if !string.starts_with("1.") {
return Err(error());
}
let minor: u16 = string[2..].parse().map_err(|_| error())?;
let patch = if input.parse::<Option<Token![.]>>()?.is_some() {
let int: LitInt = input.parse().map_err(|_| error())?;
Some(int.base10_parse().map_err(|_| error())?)
} else {
None
};
Ok(Release { minor, patch })
}
}
impl PartialEq<Bound> for Version {
fn eq(&self, rhs: &Bound) -> bool {
match rhs {
Bound::Nightly(date) => match self.channel {
Stable | Beta | Dev => false,
Nightly(nightly) => nightly == *date,
},
Bound::Stable(release) => {
self.minor == release.minor
&& release.patch.map_or(true, |patch| self.patch == patch)
}
}
}
}
impl PartialOrd<Bound> for Version {
fn partial_cmp(&self, rhs: &Bound) -> Option<Ordering> {
match rhs {
Bound::Nightly(date) => match self.channel {
Stable | Beta => Some(Ordering::Less),
Nightly(nightly) => Some(nightly.cmp(date)),
Dev => Some(Ordering::Greater),
},
Bound::Stable(release) => {
let version = (self.minor, self.patch);
let bound = (release.minor, release.patch.unwrap_or(0));
Some(version.cmp(&bound))
}
}
}
}
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