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style: Teach ComputeSquaredDistance derive about #[animation(constant)].

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Differential Revision: https://phabricator.services.mozilla.com/D5337
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Emilio Cobos Álvarez 2018-09-08 00:43:58 +02:00
parent 0ecd671f52
commit 25db9e3be7
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5 changed files with 29 additions and 37 deletions
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21
components/style_derive/compute_squared_distance.rs
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@ -2,7 +2,7 @@
* 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 animate::{AnimationInputAttrs, AnimationVariantAttrs};
use animate::{AnimationInputAttrs, AnimationVariantAttrs, AnimationFieldAttrs};
use cg;
use quote::Tokens;
use syn::{DeriveInput, Path};
@ -47,8 +47,23 @@ pub fn derive(mut input: DeriveInput) -> Tokens {
parse_quote!(#ty: ::values::distance::ComputeSquaredDistance),
);
}
quote! {
::values::distance::ComputeSquaredDistance::compute_squared_distance(#this, #other)?
let animation_field_attrs =
cg::parse_field_attrs::<AnimationFieldAttrs>(&this.ast());
if animation_field_attrs.constant {
quote! {
{
if #this != #other {
return Err(());
}
::values::distance::SquaredDistance::from_sqrt(0.)
}
}
} else {
quote! {
::values::distance::ComputeSquaredDistance::compute_squared_distance(#this, #other)?
}
}
}), quote!(+));
sum