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Introduce #[animation]

Browse source 
For now, only #[animation(error)] is supported on variants and it makes
both #[derive(Animate)] and #[derive(ComputeSquaredDistance)] ignore
this particular variant.
This commit is contained in:
Anthony Ramine 2017-08-24 01:25:57 +02:00
parent 17d97cf87b
commit ff67fc751d
5 changed files with 31 additions and 45 deletions
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13
components/style_derive/compute_squared_distance.rs
View file

@ -2,6 +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::AnimateAttrs;
use cg;
use quote;
use syn;
@ -14,7 +15,13 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let variants = cg::variants(&input);
let mut match_body = quote!();
let mut append_error_clause = variants.len() > 1;
match_body.append_all(variants.iter().map(|variant| {
let attrs = cg::parse_variant_attrs::<AnimateAttrs>(variant);
if attrs.error {
append_error_clause = true;
return None;
}
let name = cg::variant_ctor(&input, variant);
let (this_pattern, this_info) = cg::ref_pattern(&name, &variant, "this");
let (other_pattern, other_info) = cg::ref_pattern(&name, &variant, "other");
@ -32,14 +39,14 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
}), "+");
sum
};
quote! {
Some(quote! {
(&#this_pattern, &#other_pattern) => {
Ok(#sum)
}
}
})
}));
if variants.len() > 1 {
if append_error_clause {
match_body = quote! { #match_body, _ => Err(()), };
}