servo/components/style_derive/to_animated_value.rs

44 lines
1.5 KiB
Rust

/* 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;
use synstructure::BindStyle;
pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let name = &input.ident;
let trait_path = &["values", "animated", "ToAnimatedValue"];
let (impl_generics, ty_generics, mut where_clause, animated_value_type) =
cg::fmap_trait_parts(&input, trait_path, "AnimatedValue");
let to_body = cg::fmap_match(&input, BindStyle::Move, |binding| {
where_clause.add_trait_bound(&binding.field.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))
});
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
}
}
}
}
}