зеркало из https://github.com/mozilla/gecko-dev.git
60 строки
2.1 KiB
Rust
60 строки
2.1 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use cg;
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use quote;
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use syn;
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pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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let name = &input.ident;
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let trait_path = &["values", "animated", "Animate"];
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let (impl_generics, ty_generics, mut where_clause) =
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cg::trait_parts(&input, trait_path);
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let variants = cg::variants(&input);
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let mut match_body = quote!();
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match_body.append_all(variants.iter().map(|variant| {
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let name = cg::variant_ctor(&input, variant);
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let (this_pattern, this_info) = cg::ref_pattern(&name, variant, "this");
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let (other_pattern, other_info) = cg::ref_pattern(&name, variant, "other");
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let (result_value, result_info) = cg::value(&name, variant, "result");
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let mut computations = quote!();
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let iter = result_info.iter().zip(this_info.iter().zip(&other_info));
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computations.append_all(iter.map(|(result, (this, other))| {
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where_clause.predicates.push(
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cg::where_predicate(this.field.ty.clone(), trait_path),
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);
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quote! {
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let #result = ::values::animated::Animate::animate(#this, #other, procedure)?;
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}
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}));
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quote! {
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(&#this_pattern, &#other_pattern) => {
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#computations
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Ok(#result_value)
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}
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}
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}));
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if variants.len() > 1 {
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match_body = quote! { #match_body, _ => Err(()), };
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}
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quote! {
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impl #impl_generics ::values::animated::Animate for #name #ty_generics #where_clause {
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#[allow(unused_variables, unused_imports)]
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#[inline]
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fn animate(
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&self,
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other: &Self,
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procedure: ::values::animated::Procedure,
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) -> Result<Self, ()> {
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match (self, other) {
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#match_body
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}
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}
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}
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}
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}
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