1 files changed, 52 insertions, 0 deletions
diff --git a/servo/components/style_derive/to_resolved_value.rs b/servo/components/style_derive/to_resolved_value.rs
new file mode 100644
index 0000000000..e049f91152
--- /dev/null
+++ b/servo/components/style_derive/to_resolved_value.rs
@@ -0,0 +1,52 @@
+/* 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 derive_common::cg;
+use proc_macro2::TokenStream;
+use syn::DeriveInput;
+use synstructure::BindStyle;
+use to_computed_value;
+
+pub fn derive(input: DeriveInput) -> TokenStream {
+    let trait_impl = |from_body, to_body| {
+        quote! {
+             #[inline]
+             fn from_resolved_value(from: Self::ResolvedValue) -> Self {
+                 #from_body
+             }
+
+             #[inline]
+             fn to_resolved_value(
+                 self,
+                 context: &crate::values::resolved::Context,
+             ) -> Self::ResolvedValue {
+                 #to_body
+             }
+        }
+    };
+
+    to_computed_value::derive_to_value(
+        input,
+        parse_quote!(crate::values::resolved::ToResolvedValue),
+        parse_quote!(ResolvedValue),
+        BindStyle::Move,
+        |binding| {
+            let attrs = cg::parse_field_attrs::<ResolvedValueAttrs>(&binding.ast());
+            to_computed_value::ToValueAttrs {
+                field_bound: attrs.field_bound,
+                no_field_bound: attrs.no_field_bound,
+            }
+        },
+        |binding| quote!(crate::values::resolved::ToResolvedValue::from_resolved_value(#binding)),
+        |binding| quote!(crate::values::resolved::ToResolvedValue::to_resolved_value(#binding, context)),
+        trait_impl,
+    )
+}
+
+#[derive(Default, FromField)]
+#[darling(attributes(resolve), default)]
+struct ResolvedValueAttrs {
+    field_bound: bool,
+    no_field_bound: bool,
+}