1 unstable release
0.1.0 | Feb 5, 2019 |
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#20 in #from-str
136 downloads per month
Used in 3 crates
4KB
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enum-from-str-rs
Allow derive FromStr for enums
Overview
This library adds the #[derive(FromStr)]
attribute for enums, thus allowing parsing strings into enum variants. Even though there are other libraries that allows this, like enum_derive, it only allows you to parse from strings with the exact name of a variant. This library allows you to define a custom string for each enum variant.
Basic usage
use enum_from_str::ParseEnumVariantError;
use enum_from_str_derive::FromStr;
#[derive(FromStr)]
enum SomeEnum {
#[from_str="foo"]
Foo,
Bar, // equals to #[from_str="Bar"]
}
fn example() {
"foo".parse::<SomeEnum>().unwrap();
"Bar".parse::<SomeEnum>().unwrap();
}
Known issues
Currently, proc-macro crates doesn't allow exporting anything other than the proc-macro function. That's why ParseEnumVariantError is in a different crate. When Rust allows it, it should be moved into a single crate.
Dependencies
~2MB
~47K SLoC