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Add syntax to bind to properties instead of attributes #2819

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merged 18 commits into from
Aug 14, 2022
Merged

Add syntax to bind to properties instead of attributes #2819

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971eaa8
Set to properties, not attributes
ranile Aug 7, 2022
2177f8c
fix tests
ranile Aug 8, 2022
27efd0a
Add tests
ranile Aug 8, 2022
866dbe6
enable disabled test, fmt
ranile Aug 8, 2022
b0c0126
Introduce @key syntax to forcefully set as attribute
ranile Aug 8, 2022
0bb8cd5
Everything compiles
ranile Aug 8, 2022
66e714c
More tests
ranile Aug 8, 2022
ea353cc
id as property
ranile Aug 8, 2022
43ab9d0
This was not meant to be committed
ranile Aug 8, 2022
9b418bf
Make test pass, fmt + clippy
ranile Aug 8, 2022
5e8c4c4
fucking rustfmt
ranile Aug 8, 2022
00deee5
is this enough formatting
ranile Aug 8, 2022
0107f03
that was not supposed to be commited
ranile Aug 8, 2022
1eea41a
apply review
ranile Aug 14, 2022
3b9fa16
Merge branch 'master' into properties-not-attributes
ranile Aug 14, 2022
b8cf9b8
fmt
ranile Aug 14, 2022
ec4f599
fix CI
ranile Aug 14, 2022
dfd2082
will you be happy now, clippy?
ranile Aug 14, 2022
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22 changes: 18 additions & 4 deletions examples/Cargo.lock
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49 changes: 25 additions & 24 deletions examples/counter_functional/src/main.rs
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Original file line number Diff line number Diff line change
@@ -1,28 +1,29 @@
use yew::prelude::*;

#[function_component]
fn App() -> Html {
let state = use_state(|| 0);

let incr_counter = {
let state = state.clone();
Callback::from(move |_| state.set(*state + 1))
};

let decr_counter = {
let state = state.clone();
Callback::from(move |_| state.set(*state - 1))
};

html!(
<>
<p> {"current count: "} {*state} </p>
<button onclick={incr_counter}> {"+"} </button>
<button onclick={decr_counter}> {"-"} </button>
</>
)
}
// #[function_component]
// fn App() -> Html {
// let state = use_state(|| 0);
//
// let incr_counter = {
// let state = state.clone();
// Callback::from(move |_| state.set(*state + 1))
// };
//
// let decr_counter = {
// let state = state.clone();
// Callback::from(move |_| state.set(*state - 1))
// };
//
// html! {
// <>
// <p @disabled={false}> {"current count: "} {*state} </p>
// <button onclick={incr_counter}> {"+"} </button>
// <button onclick={decr_counter}> {"-"} </button>
// </>
// }
// }

fn main() {
yew::Renderer::<App>::new().render();
let _d = html! {
<div class={format!("fail{}", "")}></div>
};
}
36 changes: 27 additions & 9 deletions packages/yew-macro/src/html_tree/html_element.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,10 +135,10 @@ impl ToTokens for HtmlElement {
// other attributes

let attributes = {
let normal_attrs = attributes.iter().map(|Prop { label, value, .. }| {
(label.to_lit_str(), value.optimize_literals_tagged())
let normal_attrs = attributes.iter().map(|Prop { label, value, is_forced_attribute, .. }| {
(label.to_lit_str(), value.optimize_literals_tagged(), *is_forced_attribute)
});
let boolean_attrs = booleans.iter().filter_map(|Prop { label, value, .. }| {
let boolean_attrs = booleans.iter().filter_map(|Prop { label, value, is_forced_attribute, .. }| {
let key = label.to_lit_str();
Some((
key.clone(),
Expand Down Expand Up @@ -166,6 +166,7 @@ impl ToTokens for HtmlElement {
},
),
},
*is_forced_attribute
))
});
let class_attr = classes.as_ref().and_then(|classes| match classes {
Expand Down Expand Up @@ -196,6 +197,7 @@ impl ToTokens for HtmlElement {
__yew_classes
}
}),
false,
))
}
ClassesForm::Single(classes) => {
Expand All @@ -207,6 +209,7 @@ impl ToTokens for HtmlElement {
Some((
LitStr::new("class", lit.span()),
Value::Static(quote! { #lit }),
false,
))
}
}
Expand All @@ -216,21 +219,27 @@ impl ToTokens for HtmlElement {
Value::Dynamic(quote! {
::std::convert::Into::<::yew::html::Classes>::into(#classes)
}),
false,
))
}
}
}
});

/// Try to turn attribute list into a `::yew::virtual_dom::Attributes::Static`
fn try_into_static(src: &[(LitStr, Value)]) -> Option<TokenStream> {
fn try_into_static(src: &[(LitStr, Value, bool)]) -> Option<TokenStream> {
let mut kv = Vec::with_capacity(src.len());
for (k, v) in src.iter() {
for (k, v, is_forced_attribute) in src.iter() {
let v = match v {
Value::Static(v) => quote! { #v },
Value::Dynamic(_) => return None,
};
kv.push(quote! { [ #k, #v ] });
let apply_as = if *is_forced_attribute {
quote! { ::yew::virtual_dom::ApplyAttributeAs::Attribute }
} else {
quote! { ::yew::virtual_dom::ApplyAttributeAs::Property }
};
kv.push(quote! { ( #k, #v, #apply_as ) });
}

Some(quote! { ::yew::virtual_dom::Attributes::Static(&[#(#kv),*]) })
Expand All @@ -239,10 +248,19 @@ impl ToTokens for HtmlElement {
let attrs = normal_attrs
.chain(boolean_attrs)
.chain(class_attr)
.collect::<Vec<(LitStr, Value)>>();
.collect::<Vec<(LitStr, Value, bool)>>();
try_into_static(&attrs).unwrap_or_else(|| {
let keys = attrs.iter().map(|(k, _)| quote! { #k });
let values = attrs.iter().map(|(_, v)| wrap_attr_value(v));
let keys = attrs.iter().map(|(k, _, _)| quote! { #k });
let values = attrs.iter()
.map(|(_, v, is_forced_attribute)| {
let apply_as = if *is_forced_attribute {
quote! { ::yew::virtual_dom::ApplyAttributeAs::Attribute }
} else {
quote! { ::yew::virtual_dom::ApplyAttributeAs::Property }
};
let value = wrap_attr_value(v);
quote! { ::std::option::Option::map(#value, |it| (it, ::yew::virtual_dom::ApplyAttributeAs::Property)) }
});
quote! {
::yew::virtual_dom::Attributes::Dynamic{
keys: &[#(#keys),*],
Expand Down
16 changes: 9 additions & 7 deletions packages/yew-macro/src/props/prop.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,16 +14,18 @@ use crate::html_tree::HtmlDashedName;
use crate::stringify::Stringify;

pub struct Prop {
pub is_forced_attribute: bool,
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pub label: HtmlDashedName,
/// Punctuation between `label` and `value`.
pub value: Expr,
}
impl Parse for Prop {
fn parse(input: ParseStream) -> syn::Result<Self> {
let at = input.parse::<Token![@]>().map(|_| true).unwrap_or(false);
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@WorldSEnder WorldSEnder Aug 9, 2022 •
edited
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Let's discuss some syntax and why I think using @ is not not intuitive.

  • @{} is used for dynamic tags already. We're currently not supporting dynamic attribute names, but if we were to, I'd reuse the syntax there. Since this feature does something else, I find it confusing.
  • vue syntax calls this style of modifying what a prop assignment means a "directive". There's a directive for callbacks, i.e. @click = v-on:click = a callback on the click event. And there's a directive for attribute binding, :href = v-bind:href = sets the attribute of the element.
  • Rust has alternative syntax for something akin to directives: Attributes

My preferred solution: use Token![:], i.e. :attr-name. An eventual dynamic attribute name would look like :@{expr}={value}. When we want to support further directives, we could use #[attr] attr-name={value} and #[on] event={handler} (not so sure about a short-hand form for event handlers, $click?).

Can we also support a syntax such as .prop-name (or #[prop] prop-name) to explicitly assign to a property? This is important for the complication with the property reflecting an attribute not being always named the same. See below on the comment about "class".

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See #2819 (comment)

if input.peek(Brace) {
Self::parse_shorthand_prop_assignment(input)
Self::parse_shorthand_prop_assignment(input, at)
} else {
Self::parse_prop_assignment(input)
Self::parse_prop_assignment(input, at)
}
}
}
Expand All @@ -33,7 +35,7 @@ impl Prop {
/// Parse a prop using the shorthand syntax `{value}`, short for `value={value}`
/// This only allows for labels with no hyphens, as it would otherwise create
/// an ambiguity in the syntax
fn parse_shorthand_prop_assignment(input: ParseStream) -> syn::Result<Self> {
fn parse_shorthand_prop_assignment(input: ParseStream, is_forced_attribute: bool) -> syn::Result<Self> {
let value;
let _brace = braced!(value in input);
let expr = value.parse::<Expr>()?;
Expand All @@ -44,7 +46,7 @@ impl Prop {
}) = expr
{
if let (Some(ident), true) = (path.get_ident(), attrs.is_empty()) {
syn::Result::Ok(HtmlDashedName::from(ident.clone()))
Ok(HtmlDashedName::from(ident.clone()))
} else {
Err(syn::Error::new_spanned(
path,
Expand All @@ -59,11 +61,11 @@ impl Prop {
));
}?;

Ok(Self { label, value: expr })
Ok(Self { label, value: expr, is_forced_attribute })
}

/// Parse a prop of the form `label={value}`
fn parse_prop_assignment(input: ParseStream) -> syn::Result<Self> {
fn parse_prop_assignment(input: ParseStream, is_forced_attribute: bool) -> syn::Result<Self> {
let label = input.parse::<HtmlDashedName>()?;
let equals = input.parse::<Token![=]>().map_err(|_| {
syn::Error::new_spanned(
Expand All @@ -83,7 +85,7 @@ impl Prop {
}

let value = parse_prop_value(input)?;
Ok(Self { label, value })
Ok(Self { label, value, is_forced_attribute })
}
}

Expand Down
2 changes: 1 addition & 1 deletion packages/yew-macro/src/props/prop_macro.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ impl Parse for PropValue {
impl From<PropValue> for Prop {
fn from(prop_value: PropValue) -> Prop {
let PropValue { label, value } = prop_value;
Prop { label, value }
Prop { label, value, is_forced_attribute: false }
}
}

Expand Down
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