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Move some code to its own function in #[derive(Animate)]

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This commit is contained in:
Anthony Ramine 2018-03-09 10:12:57 +01:00
parent 02b0f71d45
commit 539c60389e
1 changed files with 66 additions and 54 deletions
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82
components/style_derive/animate.rs
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@ -2,10 +2,10 @@
* 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 cg::{self, WhereClause};
use quote::Tokens;
use syn::{DeriveInput, Path};
use synstructure;
use synstructure::{Structure, VariantInfo};
pub fn derive(input: DeriveInput) -> Tokens {
let name = &input.ident;
@ -14,15 +14,55 @@ pub fn derive(input: DeriveInput) -> Tokens {
cg::trait_parts(&input, &trait_path);
let input_attrs = cg::parse_input_attrs::<AnimateInputAttrs>(&input);
let s = synstructure::Structure::new(&input);
let s = Structure::new(&input);
let mut append_error_clause = s.variants().len() > 1;
let mut match_body = s.variants().iter().fold(quote!(), |body, variant| {
let variant_attrs = cg::parse_variant_attrs::<AnimationVariantAttrs>(&variant.ast());
if variant_attrs.error {
let arm = match derive_variant_arm(variant, &mut where_clause) {
Ok(arm) => arm,
Err(()) => {
append_error_clause = true;
return body;
}
};
quote! { #body #arm }
});
if append_error_clause {
if let Some(fallback) = input_attrs.fallback {
match_body.append_all(quote! {
(this, other) => #fallback(this, other, procedure)
});
} else {
match_body.append_all(quote! { _ => Err(()) });
}
}
quote! {
impl #impl_generics ::values::animated::Animate for #name #ty_generics #where_clause {
#[allow(unused_variables, unused_imports)]
#[inline]
fn animate(
&self,
other: &Self,
procedure: ::values::animated::Procedure,
) -> Result<Self, ()> {
match (self, other) {
#match_body
}
}
}
}
}
fn derive_variant_arm(
variant: &VariantInfo,
where_clause: &mut WhereClause,
) -> Result<Tokens, ()> {
let variant_attrs = cg::parse_variant_attrs::<AnimationVariantAttrs>(&variant.ast());
if variant_attrs.error {
return Err(());
}
let (this_pattern, this_info) = cg::ref_pattern(&variant, "this");
let (other_pattern, other_info) = cg::ref_pattern(&variant, "other");
let (result_value, result_info) = cg::value(&variant, "result");
@ -63,40 +103,12 @@ pub fn derive(input: DeriveInput) -> Tokens {
}
}
}));
quote! {
#body
Ok(quote! {
(&#this_pattern, &#other_pattern) => {
#computations
Ok(#result_value)
}
}
});
if append_error_clause {
if let Some(fallback) = input_attrs.fallback {
match_body.append_all(quote! {
(this, other) => #fallback(this, other, procedure)
});
} else {
match_body.append_all(quote! { _ => Err(()) });
}
}
quote! {
impl #impl_generics ::values::animated::Animate for #name #ty_generics #where_clause {
#[allow(unused_variables, unused_imports)]
#[inline]
fn animate(
&self,
other: &Self,
procedure: ::values::animated::Procedure,
) -> Result<Self, ()> {
match (self, other) {
#match_body
}
}
}
}
})
}
#[darling(attributes(animate), default)]