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Introduce #[animation]

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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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20
components/style_derive/animate.rs
View file

@ -14,7 +14,13 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let variants = cg::variants(&input);
let mut match_body = quote!();
match_body.append_all(variants.iter().map(|variant| {
let mut append_error_clause = variants.len() > 1;
match_body.append_all(variants.iter().flat_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");
@ -29,15 +35,15 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let #result = ::values::animated::Animate::animate(#this, #other, procedure)?;
}
}));
quote! {
Some(quote! {
(&#this_pattern, &#other_pattern) => {
#computations
Ok(#result_value)
}
}
})
}));
if variants.len() > 1 {
if append_error_clause {
match_body = quote! { #match_body, _ => Err(()), };
}
@ -57,3 +63,9 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
}
}
}
#[derive(Default, FromVariant)]
#[darling(attributes(animate), default)]
pub struct AnimateAttrs {
pub error: bool,
}