Support basic immutable CSSOM

components/script/dom/cssstylesheet.rs

@@ -0,0 +1,51 @@
+/* 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/. */
+
+use dom::bindings::codegen::Bindings::CSSStyleSheetBinding;
+use dom::bindings::codegen::Bindings::CSSStyleSheetBinding::CSSStyleSheetMethods;
+use dom::bindings::js::{JS, Root, MutNullableHeap};
+use dom::bindings::reflector::{reflect_dom_object, Reflectable};
+use dom::bindings::str::DOMString;
+use dom::cssrulelist::CSSRuleList;
+use dom::stylesheet::StyleSheet;
+use dom::window::Window;
+use std::sync::Arc;
+use style::stylesheets::Stylesheet as StyleStyleSheet;
+
+#[dom_struct]
+pub struct CSSStyleSheet {
+    stylesheet: StyleSheet,
+    rulelist: MutNullableHeap<JS<CSSRuleList>>,
+    #[ignore_heap_size_of = "Arc"]
+    style_stylesheet: Arc<StyleStyleSheet>,
+}
+
+impl CSSStyleSheet {
+    fn new_inherited(type_: DOMString, href: Option<DOMString>,
+                     title: Option<DOMString>, stylesheet: Arc<StyleStyleSheet>) -> CSSStyleSheet {
+        CSSStyleSheet {
+            stylesheet: StyleSheet::new_inherited(type_, href, title),
+            rulelist: MutNullableHeap::new(None),
+            style_stylesheet: stylesheet,
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(window: &Window, type_: DOMString,
+               href: Option<DOMString>,
+               title: Option<DOMString>,
+               stylesheet: Arc<StyleStyleSheet>) -> Root<CSSStyleSheet> {
+        reflect_dom_object(box CSSStyleSheet::new_inherited(type_, href, title, stylesheet),
+                           window,
+                           CSSStyleSheetBinding::Wrap)
+    }
+}
+
+impl CSSStyleSheetMethods for CSSStyleSheet {
+    // https://drafts.csswg.org/cssom/#dom-cssstylesheet-cssrules
+    fn CssRules(&self) -> Root<CSSRuleList> {
+        self.rulelist.or_init(|| CSSRuleList::new(self.global().as_window(), self, self.style_stylesheet.rules.clone()))
+    }
+}
+