script: Add CSSImportRule WebIDL interface.

components/script/dom/bindings/trace.rs

@@ -98,7 +98,7 @@ use style::keyframes::Keyframe;
 use style::media_queries::MediaList;
 use style::properties::PropertyDeclarationBlock;
 use style::selector_parser::{PseudoElement, Snapshot};
-use style::stylesheets::{CssRules, KeyframesRule, MediaRule, NamespaceRule, StyleRule};
+use style::stylesheets::{CssRules, KeyframesRule, MediaRule, NamespaceRule, StyleRule, ImportRule};
 use style::values::specified::Length;
 use style::viewport::ViewportRule;
 use time::Duration;
@@ -525,6 +525,12 @@ unsafe impl JSTraceable for RwLock<KeyframesRule> {
     }
 }
 
+unsafe impl JSTraceable for RwLock<ImportRule> {
+    unsafe fn trace(&self, _trc: *mut JSTracer) {
+        // Do nothing.
+    }
+}
+
 unsafe impl JSTraceable for RwLock<MediaRule> {
     unsafe fn trace(&self, _trc: *mut JSTracer) {
         // Do nothing.

components/script/dom/cssimportrule.rs

@@ -0,0 +1,53 @@
+/* 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::CSSImportRuleBinding;
+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::ImportRule;
+use style_traits::ToCss;
+
+#[dom_struct]
+pub struct CSSImportRule {
+    cssrule: CSSRule,
+    #[ignore_heap_size_of = "Arc"]
+    import_rule: Arc<RwLock<ImportRule>>,
+}
+
+impl CSSImportRule {
+    fn new_inherited(parent_stylesheet: &CSSStyleSheet,
+                     import_rule: Arc<RwLock<ImportRule>>)
+                     -> Self {
+        CSSImportRule {
+            cssrule: CSSRule::new_inherited(parent_stylesheet),
+            import_rule: import_rule,
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(window: &Window,
+               parent_stylesheet: &CSSStyleSheet,
+               import_rule: Arc<RwLock<ImportRule>>) -> Root<Self> {
+        reflect_dom_object(box Self::new_inherited(parent_stylesheet, import_rule),
+                           window,
+                           CSSImportRuleBinding::Wrap)
+    }
+}
+
+impl SpecificCSSRule for CSSImportRule {
+    fn ty(&self) -> u16 {
+        use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleConstants;
+        CSSRuleConstants::IMPORT_RULE
+    }
+
+    fn get_css(&self) -> DOMString {
+        self.import_rule.read().to_css_string().into()
+    }
+}

components/script/dom/cssrule.rs

@@ -9,6 +9,7 @@ use dom::bindings::js::{JS, Root};
 use dom::bindings::reflector::{Reflector, reflect_dom_object};
 use dom::bindings::str::DOMString;
 use dom::cssfontfacerule::CSSFontFaceRule;
+use dom::cssimportrule::CSSImportRule;
 use dom::csskeyframerule::CSSKeyframeRule;
 use dom::csskeyframesrule::CSSKeyframesRule;
 use dom::cssmediarule::CSSMediaRule;
@@ -64,6 +65,8 @@ impl CSSRule {
             rule as &SpecificCSSRule
         } else if let Some(rule) = self.downcast::<CSSKeyframeRule>() {
             rule as &SpecificCSSRule
+        } else if let Some(rule) = self.downcast::<CSSImportRule>() {
+            rule as &SpecificCSSRule
         } else {
             unreachable!()
         }
@@ -75,6 +78,7 @@ impl CSSRule {
                         rule: StyleCssRule) -> Root<CSSRule> {
         // be sure to update the match in as_specific when this is updated
         match rule {
+            StyleCssRule::Import(s) => Root::upcast(CSSImportRule::new(window, parent_stylesheet, s)),
             StyleCssRule::Style(s) => Root::upcast(CSSStyleRule::new(window, parent_stylesheet, s)),
             StyleCssRule::FontFace(s) => Root::upcast(CSSFontFaceRule::new(window, parent_stylesheet, s)),
             StyleCssRule::Keyframes(s) => Root::upcast(CSSKeyframesRule::new(window, parent_stylesheet, s)),

components/script/dom/mod.rs

@@ -244,6 +244,7 @@ pub mod crypto;
 pub mod css;
 pub mod cssfontfacerule;
 pub mod cssgroupingrule;
+pub mod cssimportrule;
 pub mod csskeyframerule;
 pub mod csskeyframesrule;
 pub mod cssmediarule;

components/script/dom/webidls/CSSImportRule.webidl

@@ -0,0 +1,11 @@
+/* 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/. */
+
+// https://drafts.csswg.org/cssom/#cssimportrule
+[Exposed=Window]
+interface CSSImportRule : CSSRule {
+  // readonly attribute DOMString href;
+  // [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+  // [SameObject] readonly attribute CSSStyleSheet styleSheet;
+};

tests/wpt/mozilla/tests/mozilla/interfaces.html

@@ -22,6 +22,7 @@ test_interfaces([
   "CSS",
   "CSSFontFaceRule",
   "CSSGroupingRule",
+  "CSSImportRule",
   "CSSKeyframeRule",
   "CSSKeyframesRule",
   "CSSMediaRule",