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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use cg;
use quote;
use syn::DeriveInput;
use synstructure::BindStyle;
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),
);
}
let to_body = cg::fmap_match(&input, BindStyle::Move, |binding| {
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))
});
input.generics.where_clause = where_clause;
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;
#[allow(unused_variables)]
#[inline]
fn to_animated_value(self) -> Self::AnimatedValue {
match self {
#to_body
}
}
#[inline]
fn from_animated_value(animated: Self::AnimatedValue) -> Self {
match animated {
#from_body
}
}
}
}
}
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