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Implement automatic conversion for primitives #3533

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9dc0297
Implement automatic conversion for primitives
cecton Nov 20, 2023
d3555d8
Remove unnecessary macro
cecton Nov 20, 2023
fb6a5d4
Fix macro test fails
cecton Nov 20, 2023
a71eeb1
Update stderr
cecton Nov 20, 2023
0cc3926
Fix more tests
cecton Nov 20, 2023
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86 changes: 86 additions & 0 deletions packages/yew/src/html/conversion/into_prop_value.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -250,6 +250,44 @@ impl_into_prop!(|value: String| -> AttrValue { AttrValue::Rc(Rc::from(value)) })
impl_into_prop!(|value: Rc<str>| -> AttrValue { AttrValue::Rc(value) });
impl_into_prop!(|value: Cow<'static, str>| -> AttrValue { AttrValue::from(value) });

// implemented for casting primitive values automatically
impl_into_prop!(|value: u8| -> u16 { value.into() });
impl_into_prop!(|value: u8| -> u32 { value.into() });
impl_into_prop!(|value: u8| -> u64 { value.into() });
impl_into_prop!(|value: u8| -> u128 { value.into() });
impl_into_prop!(|value: u8| -> usize { value.into() });
impl_into_prop!(|value: u16| -> u32 { value.into() });
impl_into_prop!(|value: u16| -> u64 { value.into() });
impl_into_prop!(|value: u16| -> u128 { value.into() });
impl_into_prop!(|value: u16| -> usize { value.into() });
impl_into_prop!(|value: u32| -> u64 { value.into() });
impl_into_prop!(|value: u32| -> u128 { value.into() });
impl_into_prop!(|value: u64| -> u128 { value.into() });

impl_into_prop!(|value: i8| -> i16 { value.into() });
impl_into_prop!(|value: i8| -> i32 { value.into() });
impl_into_prop!(|value: i8| -> i64 { value.into() });
impl_into_prop!(|value: i8| -> i128 { value.into() });
impl_into_prop!(|value: i8| -> isize { value.into() });
impl_into_prop!(|value: i16| -> i32 { value.into() });
impl_into_prop!(|value: i16| -> i64 { value.into() });
impl_into_prop!(|value: i16| -> i128 { value.into() });
impl_into_prop!(|value: i16| -> isize { value.into() });
impl_into_prop!(|value: i32| -> i64 { value.into() });
impl_into_prop!(|value: i32| -> i128 { value.into() });
impl_into_prop!(|value: i64| -> i128 { value.into() });

impl_into_prop!(|value: i8| -> f32 { value.into() });
impl_into_prop!(|value: u8| -> f32 { value.into() });
impl_into_prop!(|value: i16| -> f32 { value.into() });
impl_into_prop!(|value: u16| -> f32 { value.into() });
impl_into_prop!(|value: i8| -> f64 { value.into() });
impl_into_prop!(|value: u8| -> f64 { value.into() });
impl_into_prop!(|value: i16| -> f64 { value.into() });
impl_into_prop!(|value: u16| -> f64 { value.into() });
impl_into_prop!(|value: i32| -> f64 { value.into() });
impl_into_prop!(|value: u32| -> f64 { value.into() });

impl<T: ImplicitClone + 'static> IntoPropValue<IArray<T>> for &'static [T] {
fn into_prop_value(self) -> IArray<T> {
IArray::from(self)
Expand Down Expand Up @@ -343,6 +381,54 @@ mod test {
let _: Option<AttrValue> = Cow::Borrowed("foo").into_prop_value();
}

#[test]
fn primitives() {
macro_rules! assert_into_prop_value {
($src_ty:ty => $dst_ty:ty) => {{
let _: $dst_ty = <$src_ty as Default>::default().into_prop_value();
let _: Option<$dst_ty> = <$src_ty as Default>::default().into_prop_value();
let _: Option<$dst_ty> = Some(<$src_ty as Default>::default()).into_prop_value();
}};
}

assert_into_prop_value!(u8 => u16);
assert_into_prop_value!(u8 => u32);
assert_into_prop_value!(u8 => u64);
assert_into_prop_value!(u8 => u128);
assert_into_prop_value!(u8 => usize);
assert_into_prop_value!(u16 => u32);
assert_into_prop_value!(u16 => u64);
assert_into_prop_value!(u16 => u128);
assert_into_prop_value!(u16 => usize);
assert_into_prop_value!(u32 => u64);
assert_into_prop_value!(u32 => u128);
assert_into_prop_value!(u64 => u128);

assert_into_prop_value!(i8 => i16);
assert_into_prop_value!(i8 => i32);
assert_into_prop_value!(i8 => i64);
assert_into_prop_value!(i8 => i128);
assert_into_prop_value!(i8 => isize);
assert_into_prop_value!(i16 => i32);
assert_into_prop_value!(i16 => i64);
assert_into_prop_value!(i16 => i128);
assert_into_prop_value!(i16 => isize);
assert_into_prop_value!(i32 => i64);
assert_into_prop_value!(i32 => i128);
assert_into_prop_value!(i64 => i128);

assert_into_prop_value!(i8 => f32);
assert_into_prop_value!(u8 => f32);
assert_into_prop_value!(i16 => f32);
assert_into_prop_value!(u16 => f32);
assert_into_prop_value!(i8 => f64);
assert_into_prop_value!(u8 => f64);
assert_into_prop_value!(i16 => f64);
assert_into_prop_value!(u16 => f64);
assert_into_prop_value!(i32 => f64);
assert_into_prop_value!(u32 => f64);
}

#[test]
fn test_callback() {
let _: Callback<String> = (|_: String| ()).into_prop_value();
Expand Down
2 changes: 1 addition & 1 deletion packages/yew/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -251,7 +251,7 @@ pub use yew_macro::html_nested;
/// # assert_eq!(props.name, "Minka");
/// // ... or build the associated properties of a component
/// let props = yew::props!(MyComponent::Properties {
/// id: 2,
/// id: 2_usize,
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This issue is REALLY unfortunate. The compiler used to guess that type properly before but with this change it seems it's impossible to make it work again. I don't know why. But I think the pros outweigh the cons.

error[E0277]: the trait bound `i32: IntoPropValue<usize>` is not satisfied
  --> packages/yew/src/lib.rs:255:9
   |
32 |     id: 2,
   |     --  ^ the trait `IntoPropValue<usize>` is not implemented for `i32`
   |     |
   |     required by a bound introduced by this call
   |
   = help: the following other types implement trait `IntoPropValue<T>`:
             <i32 as IntoPropValue<i64>>
             <i32 as IntoPropValue<i128>>
             <i32 as IntoPropValue<f64>>
             <i32 as IntoPropValue<VNode>>
             <i32 as IntoPropValue<Option<i64>>>
             <i32 as IntoPropValue<Option<i128>>>
             <i32 as IntoPropValue<Option<f64>>>
note: required by a bound in `PropsBuilder::id`
  --> packages/yew/src/lib.rs:231:17
   |
8  | #[derive(Clone, Properties, PartialEq)]
   |                 ^^^^^^^^^^ required by this bound in `PropsBuilder::id`
...
11 |     id: usize,
   |     -- required by a bound in this associated function
   = note: this error originates in the derive macro `Properties` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
Couldn't compile the test.

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oh wow there are a lot of occurrences of that issue in the tests, it's terrible 😩

I'm not 100% if the pros outweigh the cons in the end...

Pros:

  • basic conversion between primitives
  • particularly useful if you call functions and return a value in some kind of type then need to convert

Cons:

  • requires to be explicit on the type of the integers pass in props
  • particularly annoying when using the values directly in props (instead of using a constant or a function)

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I will try to see if I can do something smart with the macro but I think it shouldn't go to the next release. We have enough breaking changes like that that we want to fix

/// name: Cow::from("Lemmy")
/// });
/// # assert_eq!(props.id, 2);
Expand Down