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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /servo/components/style_derive/to_animated_zero.rs
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servo/components/style_derive/to_animated_zero.rs')
-rw-r--r--servo/components/style_derive/to_animated_zero.rs65
1 files changed, 65 insertions, 0 deletions
diff --git a/servo/components/style_derive/to_animated_zero.rs b/servo/components/style_derive/to_animated_zero.rs
new file mode 100644
index 0000000000..008e94cbcf
--- /dev/null
+++ b/servo/components/style_derive/to_animated_zero.rs
@@ -0,0 +1,65 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::animate::{AnimationFieldAttrs, AnimationInputAttrs, AnimationVariantAttrs};
+use derive_common::cg;
+use proc_macro2::TokenStream;
+use quote::TokenStreamExt;
+use syn;
+use synstructure;
+
+pub fn derive(mut input: syn::DeriveInput) -> TokenStream {
+ let animation_input_attrs = cg::parse_input_attrs::<AnimationInputAttrs>(&input);
+ let no_bound = animation_input_attrs.no_bound.unwrap_or_default();
+ let mut where_clause = input.generics.where_clause.take();
+ for param in input.generics.type_params() {
+ if !no_bound.iter().any(|name| name.is_ident(&param.ident)) {
+ cg::add_predicate(
+ &mut where_clause,
+ parse_quote!(#param: crate::values::animated::ToAnimatedZero),
+ );
+ }
+ }
+
+ let to_body = synstructure::Structure::new(&input).each_variant(|variant| {
+ let attrs = cg::parse_variant_attrs_from_ast::<AnimationVariantAttrs>(&variant.ast());
+ if attrs.error {
+ return Some(quote! { Err(()) });
+ }
+ let (mapped, mapped_bindings) = cg::value(variant, "mapped");
+ let bindings_pairs = variant.bindings().iter().zip(mapped_bindings);
+ let mut computations = quote!();
+ computations.append_all(bindings_pairs.map(|(binding, mapped_binding)| {
+ let field_attrs = cg::parse_field_attrs::<AnimationFieldAttrs>(&binding.ast());
+ if field_attrs.constant {
+ quote! {
+ let #mapped_binding = std::clone::Clone::clone(#binding);
+ }
+ } else {
+ quote! {
+ let #mapped_binding =
+ crate::values::animated::ToAnimatedZero::to_animated_zero(#binding)?;
+ }
+ }
+ }));
+ computations.append_all(quote! { Ok(#mapped) });
+ Some(computations)
+ });
+ input.generics.where_clause = where_clause;
+
+ let name = &input.ident;
+ let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+
+ quote! {
+ impl #impl_generics crate::values::animated::ToAnimatedZero for #name #ty_generics #where_clause {
+ #[allow(unused_variables)]
+ #[inline]
+ fn to_animated_zero(&self) -> Result<Self, ()> {
+ match *self {
+ #to_body
+ }
+ }
+ }
+ }
+}