Make #[dom_struct] a proc_macro attribute

components/dom_struct/lib.rs

@@ -0,0 +1,28 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+#![feature(proc_macro)]
+
+extern crate proc_macro;
+#[macro_use] extern crate quote;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_attribute]
+pub fn dom_struct(args: TokenStream, input: TokenStream) -> TokenStream {
+    if !args.to_string().is_empty() {
+        panic!("#[dom_struct] takes no arguments");
+    }
+    expand_string(&input.to_string()).parse().unwrap()
+}
+
+fn expand_string(input: &str) -> String {
+    let mut tokens = quote! {
+        #[derive(DenyPublicFields, DomObject, HeapSizeOf, JSTraceable)]
+        #[must_root]
+        #[repr(C)]
+    };
+    tokens.append(input);
+    tokens.to_string()
+}