Derive ToComputedValue

For now, only impls for types like in style::values::generics can be derived.

This also needed a few ToComputedValueAsSpecified impls that I would like to
replace by some #[to_computed_value(clone)] attribute, but I think it is ok
to keep it like this for now.

1 files changed, 7 insertions, 0 deletions

diff --git a/components/style_derive/lib.rs b/components/style_derive/lib.rs
index fd47a962ce9..7f4743dccd7 100644
--- a/components/style_derive/lib.rs
+++ b/components/style_derive/lib.rs
@@ -10,9 +10,16 @@ extern crate synstructure;
 use proc_macro::TokenStream;
 
 mod has_viewport_percentage;
+mod to_computed_value;
 
 #[proc_macro_derive(HasViewportPercentage)]
 pub fn derive_has_viewport_percentage(stream: TokenStream) -> TokenStream {
     let input = syn::parse_derive_input(&stream.to_string()).unwrap();
     has_viewport_percentage::derive(input).to_string().parse().unwrap()
 }
+
+#[proc_macro_derive(ToComputedValue)]
+pub fn derive_to_computed_value(stream: TokenStream) -> TokenStream {
+    let input = syn::parse_derive_input(&stream.to_string()).unwrap();
+    to_computed_value::derive(input).to_string().parse().unwrap()
+}