Using FromStr / Display for Route Captures

[athanclark]

Hello, I have a desire to use typed route matching with my yew routes, similar to how axum matches its routes. In an ideal world, I'd like the following routes to work together:

#[derive(Routable)]
enum Route {
  #[at("/:id")]
  Foo { id: u8 },
  #[at("/:bar")]
  Bar { bar: bool },
}

Where the macro generated would first try to parse the block as a u8 and save it as the id field in a Route::Foo, and if failing, it would try and do the same with a bool in the bar field of Route::Bar.

The circumstance of overlapping parsable instances would just have to cascade:

#[derive(Routable)]
enum Route {
  #[at("/:x")]
  Byte { x: u8 },
  #[at("/:x")]
  Short { x: u16 },
}

Route::Short after parsing would contain values greater than 255; it would be up to the user of the library to ensure that printing & parsing isomorphisms hold with the respect to the intent of their applications, and that parsing the data is mutually exclusive.

[athanclark]

I didn't realize that this is actually already a feature (at least I'm pretty sure, I haven't tested it yet). Here is the macro generation that parses the url path part: https://github.com/CombatClassifieds/Website/pull/31/files#diff-53acca9f15efc7bfb3445c21eae75a15deeea03c4b4332990b01cc3579c56ce2

And here it prints the part using Display: https://github.com/yewstack/yew/blob/master/packages/yew-router-macro/src/routable_derive.rs#L179