crosvm/enumn/Cargo.toml

[package]
name = "enumn"
version = "0.1.0"
authors = ["The Chromium OS Authors"]

[lib]
proc-macro = true

[dependencies]
proc-macro2 = "0.4"
quote = "0.6"
syn = "0.15"
macros: Derive macro to generate integer to enum conversion This CL adds a procedural macro to generate functions for converting a primitive integer into the corresponding variant of an enum. Loosely based on https://docs.rs/enum-primitive-derive but implemented against a newer version of Syn and without the dependency on num-traits. The generated function is named `n` and has the following signature: impl YourEnum { pub fn n(value: Repr) -> Option<Self>; } where `Repr` is an integer type of the right size as described in more detail below. EXAMPLE extern crate enumn; #[derive(PartialEq, Debug, enumn::N)] enum Status { LegendaryTriumph, QualifiedSuccess, FortuitousRevival, IndeterminateStalemate, RecoverableSetback, DireMisadventure, AbjectFailure, } fn main() { let s = Status::n(1); assert_eq!(s, Some(Status::QualifiedSuccess)); let s = Status::n(9); assert_eq!(s, None); } SIGNATURE The generated signature depends on whether the enum has a `#[repr(..)]` attribute. If a `repr` is specified, the input to `n` will be required to be of that type. #[derive(enumn::N)] #[repr(u8)] enum E { /* ... / } // expands to: impl E { pub fn n(value: u8) -> Option<Self> { / ... / } } On the other hand if no `repr` is specified then we get a signature that is generic over a variety of possible types. impl E { pub fn n<REPR: Into<i64>>(value: REPR) -> Option<Self> { / ... */ } } DISCRIMINANTS The conversion respects explictly specified enum discriminants. Consider this enum: #[derive(enumn::N)] enum Letter { A = 65, B = 66, } Here `Letter::n(65)` would return `Some(Letter::A)`. TEST=`cargo test` against the new crate Change-Id: I4286a816828c83507b35185fe497455ee30ae9e8 Reviewed-on: https://chromium-review.googlesource.com/1365114 Commit-Ready: David Tolnay <dtolnay@chromium.org> Tested-by: David Tolnay <dtolnay@chromium.org> Reviewed-by: Chirantan Ekbote <chirantan@chromium.org> Reviewed-by: Dylan Reid <dgreid@chromium.org> 2018-12-06 09:58:21 +00:00			`[package]`
			`name = "enumn"`
			`version = "0.1.0"`
			`authors = ["The Chromium OS Authors"]`

			`[lib]`
			`proc-macro = true`

			`[dependencies]`
			`proc-macro2 = "0.4"`
			`quote = "0.6"`
			`syn = "0.15"`