Implement Element.prefix (Fixes #1737)

src/components/script/dom/document.rs

@@ -269,7 +269,7 @@ impl Document {
         }
 
         let (prefix_from_qname, local_name_from_qname) = get_attribute_parts(qualified_name);
-        match (&ns, prefix_from_qname, local_name_from_qname.as_slice()) {
+        match (&ns, prefix_from_qname.clone(), local_name_from_qname.as_slice()) {
             // throw if prefix is not null and namespace is null
             (&namespace::Null, Some(_), _) => {
                 debug!("Namespace can't be null with a non-null prefix");
@@ -293,7 +293,7 @@ impl Document {
         if ns == namespace::HTML {
             Ok(build_element_from_tag(local_name_from_qname, abstract_self))
         } else {
-            Ok(Element::new(local_name_from_qname, ns, abstract_self))
+            Ok(Element::new(local_name_from_qname, ns, prefix_from_qname, abstract_self))
         }
     }
 

src/components/script/dom/element.rs

@@ -36,6 +36,7 @@ pub struct Element {
     node: Node,
     tag_name: DOMString,     // TODO: This should be an atom, not a DOMString.
     namespace: Namespace,
+    prefix: Option<DOMString>,
     attrs: ~[JS<Attr>],
     style_attribute: Option<style::PropertyDeclarationBlock>,
     attr_list: Option<JS<AttrList>>
@@ -139,19 +140,20 @@ pub enum ElementTypeId {
 //
 
 impl Element {
-    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, namespace: Namespace, document: JS<Document>) -> Element {
+    pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, namespace: Namespace, prefix: Option<DOMString>, document: JS<Document>) -> Element {
         Element {
             node: Node::new_inherited(ElementNodeTypeId(type_id), document),
             tag_name: tag_name,
             namespace: namespace,
+            prefix: prefix,
             attrs: ~[],
             attr_list: None,
             style_attribute: None,
         }
     }
 
-    pub fn new(tag_name: DOMString, namespace: Namespace, document: &JS<Document>) -> JS<Element> {
-        let element = Element::new_inherited(ElementTypeId, tag_name, namespace, document.clone());
+    pub fn new(tag_name: DOMString, namespace: Namespace, prefix: Option<DOMString>, document: &JS<Document>) -> JS<Element> {
+        let element = Element::new_inherited(ElementTypeId, tag_name, namespace, prefix, document.clone());
         Node::reflect_node(~element, document, ElementBinding::Wrap)
     }
 
@@ -455,10 +457,22 @@ impl Element {
         self.namespace.to_str().to_owned()
     }
 
+    // http://dom.spec.whatwg.org/#dom-element-prefix
+    pub fn GetPrefix(&self) -> Option<DOMString> {
+        self.prefix.clone()
+    }
+
     // http://dom.spec.whatwg.org/#dom-element-tagname
     pub fn TagName(&self) -> DOMString {
+        match self.prefix {
+            None => {
                 self.tag_name.to_ascii_upper()
             }
+            Some(ref prefix_str) => {
+                (*prefix_str + ":" + self.tag_name).to_ascii_upper()
+            }
+        }
+    }
 
     // http://dom.spec.whatwg.org/#dom-element-id
     pub fn Id(&self, abstract_self: &JS<Element>) -> DOMString {

src/components/script/dom/htmlelement.rs

@@ -35,7 +35,7 @@ impl HTMLElementDerived for EventTarget {
 impl HTMLElement {
     pub fn new_inherited(type_id: ElementTypeId, tag_name: DOMString, document: JS<Document>) -> HTMLElement {
         HTMLElement {
-            element: Element::new_inherited(type_id, tag_name, namespace::HTML, document)
+            element: Element::new_inherited(type_id, tag_name, namespace::HTML, None, document)
         }
     }
 

src/components/script/dom/node.rs

@@ -1731,16 +1731,6 @@ impl Node {
         false
     }
 
-    // http://dom.spec.whatwg.org/#dom-node-prefix
-    pub fn GetPrefix(&self) -> Option<DOMString> {
-        None
-    }
-
-    // http://dom.spec.whatwg.org/#dom-node-localname
-    pub fn GetLocalName(&self) -> Option<DOMString> {
-        None
-    }
-
     //
     // Low-level pointer stitching
     //

src/components/script/dom/webidls/Element.webidl

@@ -14,13 +14,10 @@
  */
 
 interface Element : Node {
-/*
-  We haven't moved these from Node to Element like the spec wants.
 
-  [Throws]
   readonly attribute DOMString? prefix;
-  readonly attribute DOMString localName;
-*/
+  // readonly attribute DOMString localName;
+
   [Constant]
   readonly attribute DOMString namespaceURI;
   // Not [Constant] because it depends on which document we're in

src/components/script/dom/webidls/Node.webidl

@@ -76,13 +76,4 @@ interface Node : EventTarget {
   Node replaceChild(Node node, Node child);
   [Throws]
   Node removeChild(Node child);
-
-  // Mozilla-specific stuff
-  // These have been moved to Element in the spec.
-  // If we move prefix and localName to Element they should return
-  // a non-nullable type.
-  [Constant]
-  readonly attribute DOMString? prefix;
-  [Constant]
-  readonly attribute DOMString? localName;
 };