69 lines
2 KiB
Rust
69 lines
2 KiB
Rust
// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::fmt;
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use std::str::FromStr;
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/// The epoch of the compiler (RFC 2052)
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#[derive(Clone, Copy, Hash, PartialOrd, Ord, Eq, PartialEq, Debug)]
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#[non_exhaustive]
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pub enum Epoch {
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// epochs must be kept in order, newest to oldest
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/// The 2015 epoch
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Epoch2015,
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/// The 2018 epoch
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Epoch2018,
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// when adding new epochs, be sure to update:
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//
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// - the list in the `parse_epoch` static in librustc::session::config
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// - add a `rust_####()` function to the session
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// - update the enum in Cargo's sources as well
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//
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// When -Zepoch becomes --epoch, there will
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// also be a check for the epoch being nightly-only
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// somewhere. That will need to be updated
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// whenever we're stabilizing/introducing a new epoch
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// as well as changing the default Cargo template.
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}
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// must be in order from oldest to newest
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pub const ALL_EPOCHS: &[Epoch] = &[Epoch::Epoch2015, Epoch::Epoch2018];
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impl fmt::Display for Epoch {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let s = match *self {
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Epoch::Epoch2015 => "2015",
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Epoch::Epoch2018 => "2018",
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};
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write!(f, "{}", s)
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}
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}
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impl Epoch {
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pub fn lint_name(&self) -> &'static str {
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match *self {
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Epoch::Epoch2015 => "epoch_2015",
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Epoch::Epoch2018 => "epoch_2018",
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}
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}
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}
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impl FromStr for Epoch {
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type Err = ();
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fn from_str(s: &str) -> Result<Self, ()> {
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match s {
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"2015" => Ok(Epoch::Epoch2015),
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"2018" => Ok(Epoch::Epoch2018),
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_ => Err(())
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}
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}
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}
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