Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/edition/src/lib.rs')
| -rw-r--r-- | crates/edition/src/lib.rs | 76 |
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diff --git a/crates/edition/src/lib.rs b/crates/edition/src/lib.rs new file mode 100644 index 0000000000..c25d5b9557 --- /dev/null +++ b/crates/edition/src/lib.rs @@ -0,0 +1,76 @@ +//! The edition of the Rust language used in a crate. +// This should live in a separate crate because we use it in both actual code and codegen. +use std::fmt; + +#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] +#[repr(u8)] +pub enum Edition { + Edition2015, + Edition2018, + Edition2021, + Edition2024, +} + +impl Edition { + pub const DEFAULT: Edition = Edition::Edition2015; + pub const LATEST: Edition = Edition::Edition2024; + pub const CURRENT: Edition = Edition::Edition2021; + /// The current latest stable edition, note this is usually not the right choice in code. + pub const CURRENT_FIXME: Edition = Edition::Edition2021; + + pub fn at_least_2024(self) -> bool { + self >= Edition::Edition2024 + } + + pub fn at_least_2021(self) -> bool { + self >= Edition::Edition2021 + } + + pub fn at_least_2018(self) -> bool { + self >= Edition::Edition2018 + } + + pub fn iter() -> impl Iterator<Item = Edition> { + [Edition::Edition2015, Edition::Edition2018, Edition::Edition2021, Edition::Edition2024] + .iter() + .copied() + } +} + +#[derive(Debug)] +pub struct ParseEditionError { + invalid_input: String, +} + +impl std::error::Error for ParseEditionError {} +impl fmt::Display for ParseEditionError { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "invalid edition: {:?}", self.invalid_input) + } +} + +impl std::str::FromStr for Edition { + type Err = ParseEditionError; + + fn from_str(s: &str) -> Result<Self, Self::Err> { + let res = match s { + "2015" => Edition::Edition2015, + "2018" => Edition::Edition2018, + "2021" => Edition::Edition2021, + "2024" => Edition::Edition2024, + _ => return Err(ParseEditionError { invalid_input: s.to_owned() }), + }; + Ok(res) + } +} + +impl fmt::Display for Edition { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.write_str(match self { + Edition::Edition2015 => "2015", + Edition::Edition2018 => "2018", + Edition::Edition2021 => "2021", + Edition::Edition2024 => "2024", + }) + } +} |