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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fmt;
use std::str::FromStr;
/// The edition of the compiler (RFC 2052)
#[derive(Clone, Copy, Hash, PartialEq, PartialOrd, Debug, RustcEncodable, RustcDecodable)]
#[non_exhaustive]
pub enum Edition {
// editions must be kept in order, oldest to newest
/// The 2015 edition
Edition2015,
/// The 2018 edition
Edition2018,
// when adding new editions, be sure to update:
//
// - 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
}
// must be in order from oldest to newest
pub const ALL_EDITIONS: &[Edition] = &[Edition::Edition2015, Edition::Edition2018];
pub const EDITION_NAME_LIST: &'static str = "2015|2018";
pub const DEFAULT_EDITION: Edition = Edition::Edition2015;
impl fmt::Display for Edition {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let s = match *self {
Edition::Edition2015 => "2015",
Edition::Edition2018 => "2018",
};
write!(f, "{}", s)
}
}
impl Edition {
pub fn lint_name(&self) -> &'static str {
match *self {
Edition::Edition2015 => "rust_2015_compatibility",
Edition::Edition2018 => "rust_2018_compatibility",
}
}
pub fn feature_name(&self) -> &'static str {
match *self {
Edition::Edition2015 => "rust_2015_preview",
Edition::Edition2018 => "rust_2018_preview",
}
}
pub fn is_stable(&self) -> bool {
match *self {
Edition::Edition2015 => true,
Edition::Edition2018 => true,
}
}
}
impl FromStr for Edition {
type Err = ();
fn from_str(s: &str) -> Result<Self, ()> {
match s {
"2015" => Ok(Edition::Edition2015),
"2018" => Ok(Edition::Edition2018),
_ => Err(())
}
}
}
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