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use crate::symbol::{sym, Symbol};
use std::fmt;
use std::str::FromStr;
use rustc_macros::HashStable_Generic;
/// The edition of the compiler. (See [RFC 2052](https://github.com/rust-lang/rfcs/blob/master/text/2052-epochs.md).)
#[derive(Clone, Copy, Hash, PartialEq, PartialOrd, Debug, Encodable, Decodable, Eq)]
#[derive(HashStable_Generic)]
pub enum Edition {
// When adding new editions, be sure to do the following:
//
// - update the `ALL_EDITIONS` const
// - update the `EDITION_NAME_LIST` const
// - add a `rust_####()` function to the session
// - update the enum in Cargo's sources as well
//
// Editions *must* be kept in order, oldest to newest.
/// The 2015 edition
Edition2015,
/// The 2018 edition
Edition2018,
/// The 2021 edition
Edition2021,
/// The 2024 edition
Edition2024,
}
// Must be in order from oldest to newest.
pub const ALL_EDITIONS: &[Edition] =
&[Edition::Edition2015, Edition::Edition2018, Edition::Edition2021, Edition::Edition2024];
pub const EDITION_NAME_LIST: &str = "2015|2018|2021|2024";
pub const DEFAULT_EDITION: Edition = Edition::Edition2015;
pub const LATEST_STABLE_EDITION: Edition = Edition::Edition2021;
impl fmt::Display for Edition {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let s = match *self {
Edition::Edition2015 => "2015",
Edition::Edition2018 => "2018",
Edition::Edition2021 => "2021",
Edition::Edition2024 => "2024",
};
write!(f, "{}", s)
}
}
impl Edition {
pub fn lint_name(&self) -> &'static str {
match *self {
Edition::Edition2015 => "rust_2015_compatibility",
Edition::Edition2018 => "rust_2018_compatibility",
Edition::Edition2021 => "rust_2021_compatibility",
Edition::Edition2024 => "rust_2024_compatibility",
}
}
pub fn feature_name(&self) -> Symbol {
match *self {
Edition::Edition2015 => sym::rust_2015_preview,
Edition::Edition2018 => sym::rust_2018_preview,
Edition::Edition2021 => sym::rust_2021_preview,
Edition::Edition2024 => sym::rust_2024_preview,
}
}
pub fn is_stable(&self) -> bool {
match *self {
Edition::Edition2015 => true,
Edition::Edition2018 => true,
Edition::Edition2021 => true,
Edition::Edition2024 => false,
}
}
pub fn rust_2015(&self) -> bool {
*self == Edition::Edition2015
}
/// Are we allowed to use features from the Rust 2018 edition?
pub fn rust_2018(&self) -> bool {
*self >= Edition::Edition2018
}
/// Are we allowed to use features from the Rust 2021 edition?
pub fn rust_2021(&self) -> bool {
*self >= Edition::Edition2021
}
/// Are we allowed to use features from the Rust 2024 edition?
pub fn rust_2024(&self) -> bool {
*self >= Edition::Edition2024
}
}
impl FromStr for Edition {
type Err = ();
fn from_str(s: &str) -> Result<Self, ()> {
match s {
"2015" => Ok(Edition::Edition2015),
"2018" => Ok(Edition::Edition2018),
"2021" => Ok(Edition::Edition2021),
"2024" => Ok(Edition::Edition2024),
_ => Err(()),
}
}
}
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