Support basic immutable CSSOM

components/script/dom/cssstylerule.rs

@@ -0,0 +1,50 @@
+/* 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::CSSStyleRuleBinding;
+use dom::bindings::js::Root;
+use dom::bindings::reflector::reflect_dom_object;
+use dom::bindings::str::DOMString;
+use dom::cssrule::{CSSRule, SpecificCSSRule};
+use dom::cssstylesheet::CSSStyleSheet;
+use dom::window::Window;
+use parking_lot::RwLock;
+use std::sync::Arc;
+use style::stylesheets::StyleRule;
+use style_traits::ToCss;
+
+#[dom_struct]
+pub struct CSSStyleRule {
+    cssrule: CSSRule,
+    #[ignore_heap_size_of = "Arc"]
+    stylerule: Arc<RwLock<StyleRule>>,
+}
+
+impl CSSStyleRule {
+    fn new_inherited(parent: &CSSStyleSheet, stylerule: Arc<RwLock<StyleRule>>) -> CSSStyleRule {
+        CSSStyleRule {
+            cssrule: CSSRule::new_inherited(parent),
+            stylerule: stylerule,
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(window: &Window, parent: &CSSStyleSheet,
+               stylerule: Arc<RwLock<StyleRule>>) -> Root<CSSStyleRule> {
+        reflect_dom_object(box CSSStyleRule::new_inherited(parent, stylerule),
+                           window,
+                           CSSStyleRuleBinding::Wrap)
+    }
+}
+
+impl SpecificCSSRule for CSSStyleRule {
+    fn ty(&self) -> u16 {
+        use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleConstants;
+        CSSRuleConstants::STYLE_RULE
+    }
+
+    fn get_css(&self) -> DOMString {
+        self.stylerule.read().to_css_string().into()
+    }
+}