diff options
Diffstat (limited to 'src/features.rs')
| -rw-r--r-- | src/features.rs | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/src/features.rs b/src/features.rs deleted file mode 100644 index ba2f11cf..00000000 --- a/src/features.rs +++ /dev/null @@ -1,187 +0,0 @@ -//! Contains code for selecting features - -#![deny(missing_docs)] -#![deny(warnings)] -#![deny(unused_extern_crates)] - -use std::io; -use std::str::FromStr; - -/// Define RustTarget struct definition, Default impl, and conversions -/// between RustTarget and String. -macro_rules! rust_target_def { - ( $( $( #[$attr:meta] )* => $release:ident => $value:expr; )* ) => { - /// Represents the version of the Rust language to target. - /// - /// To support a beta release, use the corresponding stable release. - /// - /// This enum will have more variants added as necessary. - #[derive(Debug, Copy, Clone, Eq, PartialEq, PartialOrd, Hash)] - #[allow(non_camel_case_types)] - pub enum RustTarget { - $( - $( - #[$attr] - )* - $release, - )* - } - - impl Default for RustTarget { - /// Gives the latest stable Rust version - fn default() -> RustTarget { - LATEST_STABLE_RUST - } - } - - impl FromStr for RustTarget { - type Err = io::Error; - - #[allow(dead_code)] - /// Create a `RustTarget` from a string. - /// - /// * The stable/beta versions of Rust are of the form "1.0", - /// "1.19", etc. - /// * The nightly version should be specified with "nightly". - fn from_str(s: &str) -> Result<Self, Self::Err> { - match s.as_ref() { - $( - stringify!($value) => Ok(RustTarget::$release), - )* - _ => Err( - io::Error::new( - io::ErrorKind::InvalidInput, - concat!( - "Got an invalid rust target. Accepted values ", - "are of the form ", - "\"1.0\" or \"nightly\"."))), - } - } - } - - impl From<RustTarget> for String { - fn from(target: RustTarget) -> Self { - match target { - $( - RustTarget::$release => stringify!($value), - )* - }.into() - } - } - } -} - -/// Defines an array slice with all RustTarget values -macro_rules! rust_target_values_def { - ( $( $( #[$attr:meta] )* => $release:ident => $value:expr; )* ) => { - /// Strings of allowed `RustTarget` values - #[allow(dead_code)] - pub static RUST_TARGET_STRINGS: &'static [&str] = &[ - $( - stringify!($value), - )* - ]; - } -} - -/// Defines macro which takes a macro -macro_rules! rust_target_base { - ( $x_macro:ident ) => { - $x_macro!( - /// Rust stable 1.0 - => Stable_1_0 => 1.0; - /// Rust stable 1.19 - => Stable_1_19 => 1.19; - /// Nightly rust - => Nightly => nightly; - ); - } -} - -rust_target_base!(rust_target_def); -rust_target_base!(rust_target_values_def); - -/// Latest stable release of Rust -pub const LATEST_STABLE_RUST: RustTarget = RustTarget::Stable_1_19; - -/// Create RustFeatures struct definition, new(), and a getter for each field -macro_rules! rust_feature_def { - ( $( $( #[$attr:meta] )* => $feature:ident; )* ) => { - /// Features supported by a rust target - #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)] - pub struct RustFeatures { - $( - $feature: bool, - )* - } - - impl RustFeatures { - /// Gives a RustFeatures struct with all features disabled - fn new() -> Self { - RustFeatures { - $( - $feature: false, - )* - } - } - - $( - $( - #[$attr] - )* - pub fn $feature(&self) -> bool { - self.$feature - } - )* - } - } -} - -rust_feature_def!( - /// Untagged unions ([RFC 1444](https://github.com/rust-lang/rfcs/blob/master/text/1444-union.md)) - => untagged_union; - /// Constant function ([RFC 911](https://github.com/rust-lang/rfcs/blob/master/text/0911-const-fn.md)) - => const_fn; -); - -impl From<RustTarget> for RustFeatures { - fn from(rust_target: RustTarget) -> Self { - let mut features = RustFeatures::new(); - - if rust_target >= RustTarget::Stable_1_19 { - features.untagged_union = true; - } - - if rust_target >= RustTarget::Nightly { - features.const_fn = true; - } - - features - } -} - -impl Default for RustFeatures { - fn default() -> Self { - let default_rust_target: RustTarget = Default::default(); - Self::from(default_rust_target) - } -} - -#[cfg(test)] -mod test { - #![allow(unused_imports)] - use super::*; - - fn test_target(target_str: &str, target: RustTarget) { - let target_string: String = target.into(); - assert_eq!(target_str, target_string); - assert_eq!(target, RustTarget::from_str(target_str).unwrap()); - } - - #[test] - fn str_to_target() { - test_target("1.0", RustTarget::Stable_1_0); - test_target("1.19", RustTarget::Stable_1_19); - test_target("nightly", RustTarget::Nightly); - } -} |