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Simplify the derived bounds for ToAnimatedValue

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This commit is contained in:
Anthony Ramine 2018-03-09 15:11:17 +01:00
parent 664efab4a3
commit 92068ca540
2 changed files with 29 additions and 9 deletions
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13
components/style_derive/cg.rs
View file

@ -126,7 +126,16 @@ pub fn fmap_trait_parts<'input, 'path>(
) -> (ImplGenerics<'input>, TypeGenerics<'input>, WhereClause<'input, 'path>, Path) {
let (impl_generics, ty_generics, mut where_clause) = trait_parts(input, trait_path);
where_clause.trait_output = Some(trait_output);
let output_ty = PathSegment {
let output_ty = fmap_trait_output(input, trait_path, trait_output);
(impl_generics, ty_generics, where_clause, output_ty)
}
pub fn fmap_trait_output(
input: &DeriveInput,
trait_path: &Path,
trait_output: Ident,
) -> Path {
let segment = PathSegment {
ident: input.ident.clone(),
arguments: PathArguments::AngleBracketed(AngleBracketedGenericArguments {
args: input.generics.params.iter().map(|arg| {
@ -151,7 +160,7 @@ pub fn fmap_trait_parts<'input, 'path>(
})
};
(impl_generics, ty_generics, where_clause, output_ty.into())
segment.into()
}
pub fn is_parameterized(

25
components/style_derive/to_animated_value.rs
View file

@ -4,23 +4,34 @@
use cg;
use quote;
use syn::{self, Ident};
use syn::DeriveInput;
use synstructure::BindStyle;
pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let name = &input.ident;
let trait_path = parse_quote!(values::animated::ToAnimatedValue);
let (impl_generics, ty_generics, mut where_clause, animated_value_type) =
cg::fmap_trait_parts(&input, &trait_path, Ident::from("AnimatedValue"));
pub fn derive(mut input: DeriveInput) -> quote::Tokens {
let mut where_clause = input.generics.where_clause.take();
for param in input.generics.type_params() {
cg::add_predicate(
&mut where_clause,
parse_quote!(#param: ::values::animated::ToAnimatedValue),
);
}
input.generics.where_clause = where_clause;
let to_body = cg::fmap_match(&input, BindStyle::Move, |binding| {
where_clause.add_trait_bound(&binding.ast().ty);
quote!(::values::animated::ToAnimatedValue::to_animated_value(#binding))
});
let from_body = cg::fmap_match(&input, BindStyle::Move, |binding| {
quote!(::values::animated::ToAnimatedValue::from_animated_value(#binding))
});
let name = &input.ident;
let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
let animated_value_type = cg::fmap_trait_output(
&input,
&parse_quote!(values::animated::ToAnimatedValue),
"AnimatedValue".into(),
);
quote! {
impl #impl_generics ::values::animated::ToAnimatedValue for #name #ty_generics #where_clause {
type AnimatedValue = #animated_value_type;