4 files changed, 50 insertions, 8 deletions

diff --git a/components/script/dom/cssgroupingrule.rs b/components/script/dom/cssgroupingrule.rs
index 34d7a9d15b6..4c08727b229 100644
--- a/components/script/dom/cssgroupingrule.rs
+++ b/components/script/dom/cssgroupingrule.rs
@@ -2,29 +2,69 @@
  * 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::reflector::Reflectable;
 use dom::bindings::codegen::Bindings::CSSGroupingRuleBinding;
-use dom::bindings::js::Root;
+use dom::bindings::codegen::Bindings::CSSGroupingRuleBinding::CSSGroupingRuleMethods;
+use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleBinding::CSSRuleMethods;
+use dom::bindings::error::{ErrorResult, Fallible};
+use dom::bindings::inheritance::Castable;
+use dom::bindings::js::{JS, MutNullableHeap, Root};
 use dom::bindings::reflector::reflect_dom_object;
+use dom::bindings::str::DOMString;
 use dom::cssrule::CSSRule;
+use dom::cssrulelist::{CSSRuleList, RulesSource};
 use dom::cssstylesheet::CSSStyleSheet;
 use dom::window::Window;
+use style::stylesheets::CssRules as StyleCssRules;
 
 #[dom_struct]
 pub struct CSSGroupingRule {
     cssrule: CSSRule,
+    #[ignore_heap_size_of = "Arc"]
+    rules: StyleCssRules,
+    rulelist: MutNullableHeap<JS<CSSRuleList>>,
 }
 
 impl CSSGroupingRule {
-    pub fn new_inherited(parent: Option<&CSSStyleSheet>) -> CSSGroupingRule {
+    pub fn new_inherited(parent: Option<&CSSStyleSheet>,
+                         rules: StyleCssRules) -> CSSGroupingRule {
         CSSGroupingRule {
             cssrule: CSSRule::new_inherited(parent),
+            rules: rules,
+            rulelist: MutNullableHeap::new(None),
         }
     }
 
     #[allow(unrooted_must_root)]
-    pub fn new(window: &Window, parent: Option<&CSSStyleSheet>) -> Root<CSSGroupingRule> {
-        reflect_dom_object(box CSSGroupingRule::new_inherited(parent),
+    pub fn new(window: &Window, parent: Option<&CSSStyleSheet>, rules: StyleCssRules) -> Root<CSSGroupingRule> {
+        reflect_dom_object(box CSSGroupingRule::new_inherited(parent, rules),
                            window,
                            CSSGroupingRuleBinding::Wrap)
     }
+
+    fn rulelist(&self) -> Root<CSSRuleList> {
+        let sheet = self.upcast::<CSSRule>().GetParentStyleSheet();
+        let sheet = sheet.as_ref().map(|s| &**s);
+        self.rulelist.or_init(|| CSSRuleList::new(self.global().as_window(),
+                                                  sheet,
+                                                  RulesSource::Rules(self.rules.clone())))
+    }
+}
+
+impl CSSGroupingRuleMethods for CSSGroupingRule {
+    // https://drafts.csswg.org/cssom/#dom-cssgroupingrule-cssrules
+    fn CssRules(&self) -> Root<CSSRuleList> {
+        // XXXManishearth check origin clean flag
+        self.rulelist()
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-cssgroupingrule-insertrule
+    fn InsertRule(&self, rule: DOMString, index: u32) -> Fallible<u32> {
+        self.rulelist().insert_rule(&rule, index, /* nested */ true)
+    }
+
+    // https://drafts.csswg.org/cssom/#dom-cssgroupingrule-deleterule
+    fn DeleteRule(&self, index: u32) -> ErrorResult {
+        self.rulelist().remove_rule(index)
+    }
 }
diff --git a/components/script/dom/cssmediarule.rs b/components/script/dom/cssmediarule.rs
index d6eef1319f7..67933fccd3b 100644
--- a/components/script/dom/cssmediarule.rs
+++ b/components/script/dom/cssmediarule.rs
@@ -24,8 +24,9 @@ pub struct CSSMediaRule {
 
 impl CSSMediaRule {
     fn new_inherited(parent: Option<&CSSStyleSheet>, mediarule: Arc<RwLock<MediaRule>>) -> CSSMediaRule {
+        let list = mediarule.read().rules.clone();
         CSSMediaRule {
-            cssrule: CSSGroupingRule::new_inherited(parent),
+            cssrule: CSSGroupingRule::new_inherited(parent, list),
             mediarule: mediarule,
         }
     }
diff --git a/components/script/dom/cssrulelist.rs b/components/script/dom/cssrulelist.rs
index f7969aeb984..225f04a560d 100644
--- a/components/script/dom/cssrulelist.rs
+++ b/components/script/dom/cssrulelist.rs
@@ -20,6 +20,7 @@ use style::stylesheets::{CssRules, KeyframesRule, Origin};
 use style::stylesheets::CssRule as StyleCssRule;
 
 no_jsmanaged_fields!(RulesSource);
+no_jsmanaged_fields!(CssRules);
 
 #[dom_struct]
 pub struct CSSRuleList {
diff --git a/components/script/dom/webidls/CSSGroupingRule.webidl b/components/script/dom/webidls/CSSGroupingRule.webidl
index 6a317191ff6..9f8347a17d5 100644
--- a/components/script/dom/webidls/CSSGroupingRule.webidl
+++ b/components/script/dom/webidls/CSSGroupingRule.webidl
@@ -5,8 +5,8 @@
 // https://drafts.csswg.org/cssom/#the-cssgroupingrule-interface
 [Exposed=Window]
 interface CSSGroupingRule : CSSRule {
-  // [SameObject] readonly attribute CSSRuleList cssRules;
-  // unsigned long insertRule(DOMString rule, unsigned long index);
-  // void deleteRule(unsigned long index);
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  [Throws] unsigned long insertRule(DOMString rule, unsigned long index);
+  [Throws] void deleteRule(unsigned long index);
 };