compiler/rustc_span/src/edition.rs

   1 use crate::symbol::{sym, Symbol};
   2 use std::fmt;
   3 use std::str::FromStr;
   4
   5 use rustc_macros::HashStable_Generic;
   6
   7 /// The edition of the compiler (RFC 2052)
   8 #[derive(Clone, Copy, Hash, PartialEq, PartialOrd, Debug, Encodable, Decodable, Eq)]
   9 #[derive(HashStable_Generic)]
  10 pub enum Edition {
  11     // editions must be kept in order, oldest to newest
  12     /// The 2015 edition
  13     Edition2015,
  14     /// The 2018 edition
  15     Edition2018,
  16     // when adding new editions, be sure to update:
  17     //
  18     // - Update the `ALL_EDITIONS` const
  19     // - Update the EDITION_NAME_LIST const
  20     // - add a `rust_####()` function to the session
  21     // - update the enum in Cargo's sources as well
  22 }
  23
  24 // must be in order from oldest to newest
  25 pub const ALL_EDITIONS: &[Edition] = &[Edition::Edition2015, Edition::Edition2018];
  26
  27 pub const EDITION_NAME_LIST: &str = "2015|2018";
  28
  29 pub const DEFAULT_EDITION: Edition = Edition::Edition2015;
  30
  31 impl fmt::Display for Edition {
  32     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  33         let s = match *self {
  34             Edition::Edition2015 => "2015",
  35             Edition::Edition2018 => "2018",
  36         };
  37         write!(f, "{}", s)
  38     }
  39 }
  40
  41 impl Edition {
  42     pub fn lint_name(&self) -> &'static str {
  43         match *self {
  44             Edition::Edition2015 => "rust_2015_compatibility",
  45             Edition::Edition2018 => "rust_2018_compatibility",
  46         }
  47     }
  48
  49     pub fn feature_name(&self) -> Symbol {
  50         match *self {
  51             Edition::Edition2015 => sym::rust_2015_preview,
  52             Edition::Edition2018 => sym::rust_2018_preview,
  53         }
  54     }
  55
  56     pub fn is_stable(&self) -> bool {
  57         match *self {
  58             Edition::Edition2015 => true,
  59             Edition::Edition2018 => true,
  60         }
  61     }
  62 }
  63
  64 impl FromStr for Edition {
  65     type Err = ();
  66     fn from_str(s: &str) -> Result<Self, ()> {
  67         match s {
  68             "2015" => Ok(Edition::Edition2015),
  69             "2018" => Ok(Edition::Edition2018),
  70             _ => Err(()),
  71         }
  72     }
  73 }