src/librustc_span/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(
   9     Clone,
  10     Copy,
  11     Hash,
  12     PartialEq,
  13     PartialOrd,
  14     Debug,
  15     RustcEncodable,
  16     RustcDecodable,
  17     Eq,
  18     HashStable_Generic
  19 )]
  20 pub enum Edition {
  21     // editions must be kept in order, oldest to newest
  22     /// The 2015 edition
  23     Edition2015,
  24     /// The 2018 edition
  25     Edition2018,
  26     // when adding new editions, be sure to update:
  27     //
  28     // - Update the `ALL_EDITIONS` const
  29     // - Update the EDITION_NAME_LIST const
  30     // - add a `rust_####()` function to the session
  31     // - update the enum in Cargo's sources as well
  32 }
  33
  34 // must be in order from oldest to newest
  35 pub const ALL_EDITIONS: &[Edition] = &[Edition::Edition2015, Edition::Edition2018];
  36
  37 pub const EDITION_NAME_LIST: &str = "2015|2018";
  38
  39 pub const DEFAULT_EDITION: Edition = Edition::Edition2015;
  40
  41 impl fmt::Display for Edition {
  42     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  43         let s = match *self {
  44             Edition::Edition2015 => "2015",
  45             Edition::Edition2018 => "2018",
  46         };
  47         write!(f, "{}", s)
  48     }
  49 }
  50
  51 impl Edition {
  52     pub fn lint_name(&self) -> &'static str {
  53         match *self {
  54             Edition::Edition2015 => "rust_2015_compatibility",
  55             Edition::Edition2018 => "rust_2018_compatibility",
  56         }
  57     }
  58
  59     pub fn feature_name(&self) -> Symbol {
  60         match *self {
  61             Edition::Edition2015 => sym::rust_2015_preview,
  62             Edition::Edition2018 => sym::rust_2018_preview,
  63         }
  64     }
  65
  66     pub fn is_stable(&self) -> bool {
  67         match *self {
  68             Edition::Edition2015 => true,
  69             Edition::Edition2018 => true,
  70         }
  71     }
  72 }
  73
  74 impl FromStr for Edition {
  75     type Err = ();
  76     fn from_str(s: &str) -> Result<Self, ()> {
  77         match s {
  78             "2015" => Ok(Edition::Edition2015),
  79             "2018" => Ok(Edition::Edition2018),
  80             _ => Err(()),
  81         }
  82     }
  83 }