| // 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, PartialOrd, Ord, Eq, PartialEq, Debug)] |
| #[non_exhaustive] |
| pub enum Edition { |
| // editions must be kept in order, newest to oldest |
| |
| /// The 2015 edition |
| Edition2015, |
| /// The 2018 edition |
| Edition2018, |
| |
| // when adding new editions, be sure to update: |
| // |
| // - the list in the `parse_edition` static in librustc::session::config |
| // - add a `rust_####()` function to the session |
| // - update the enum in Cargo's sources as well |
| // |
| // When -Zedition becomes --edition, there will |
| // also be a check for the edition being nightly-only |
| // somewhere. That will need to be updated |
| // whenever we're stabilizing/introducing a new edition |
| // as well as changing the default Cargo template. |
| } |
| |
| // must be in order from oldest to newest |
| pub const ALL_EDITIONS: &[Edition] = &[Edition::Edition2015, Edition::Edition2018]; |
| |
| 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 => "edition_2015", |
| Edition::Edition2018 => "edition_2018", |
| } |
| } |
| |
| pub fn feature_name(&self) -> &'static str { |
| match *self { |
| Edition::Edition2015 => "rust_2015_preview", |
| Edition::Edition2018 => "rust_2018_preview", |
| } |
| } |
| } |
| |
| impl FromStr for Edition { |
| type Err = (); |
| fn from_str(s: &str) -> Result<Self, ()> { |
| match s { |
| "2015" => Ok(Edition::Edition2015), |
| "2018" => Ok(Edition::Edition2018), |
| _ => Err(()) |
| } |
| } |
| } |