Move Element::get_attr to a trait defined in util::tree

… and add a get_local_name() method to that trait.

src/components/main/css/select_handler.rs

@@ -9,6 +9,7 @@
 use std::str::eq_slice;
 use newcss::select::SelectHandler;
 use script::dom::node::{AbstractNode, LayoutView};
+use servo_util::tree::ElementLike;
 
 pub struct NodeSelectHandler {
     node: AbstractNode<LayoutView>,

src/components/main/layout/box.rs

@@ -38,6 +38,7 @@ use script::dom::node::{AbstractNode, LayoutView};
 use servo_net::image::holder::ImageHolder;
 use servo_net::local_image_cache::LocalImageCache;
 use servo_util::range::*;
+use servo_util::tree::ElementLike;
 use extra::url::Url;
 
 /// Render boxes (`struct RenderBox`) are the leaves of the layout tree. They cannot position

src/components/script/dom/document.rs

@@ -24,7 +24,7 @@ use html::hubbub_html_parser::build_element_from_tag;
 use js::jsapi::{JSObject, JSContext, JSVal};
 use js::jsapi::{JSTRACE_OBJECT, JSTracer, JS_CallTracer};
 use js::glue::RUST_OBJECT_TO_JSVAL;
-use servo_util::tree::TreeNodeRef;
+use servo_util::tree::{TreeNodeRef, ElementLike};
 
 use std::hashmap::HashMap;
 

src/components/script/dom/element.rs

@@ -14,6 +14,7 @@ use dom::node::{ElementNodeTypeId, Node, ScriptView, AbstractNode};
 use layout_interface::{ContentBoxQuery, ContentBoxResponse, ContentBoxesQuery};
 use layout_interface::{ContentBoxesResponse};
 use newcss::stylesheet::Stylesheet;
+use servo_util::tree::ElementLike;
 
 use js::jsapi::{JSContext, JSObject};
 
@@ -119,17 +120,12 @@ pub enum ElementTypeId {
 // Element methods
 //
 
-impl<'self> Element {
-    pub fn new(type_id: ElementTypeId, tag_name: ~str, document: AbstractDocument) -> Element {
-        Element {
-            node: Node::new(ElementNodeTypeId(type_id), document),
-            tag_name: tag_name,
-            attrs: ~[],
-            style_attribute: None,
-        }
+impl<'self> ElementLike<'self> for Element {
+    fn get_local_name(&'self self) -> &'self str {
+        self.tag_name.as_slice()
     }
 
-    pub fn get_attr(&'self self, name: &str) -> Option<&'self str> {
+    fn get_attr(&'self self, name: &str) -> Option<&'self str> {
         // FIXME: Need an each() that links lifetimes in Rust.
         for attr in self.attrs.iter() {
             // FIXME: only case-insensitive in the HTML namespace (as opposed to SVG, etc.)
@@ -140,6 +136,17 @@ impl<'self> Element {
         }
         return None;
     }
+}
+
+impl<'self> Element {
+    pub fn new(type_id: ElementTypeId, tag_name: ~str, document: AbstractDocument) -> Element {
+        Element {
+            node: Node::new(ElementNodeTypeId(type_id), document),
+            tag_name: tag_name,
+            attrs: ~[],
+            style_attribute: None,
+        }
+    }
 
     pub fn set_attr(&mut self,
                     abstract_self: AbstractNode<ScriptView>,

src/components/script/dom/htmldocument.rs

@@ -13,7 +13,7 @@ use dom::window::Window;
 
 use js::jsapi::{JSObject, JSContext, JSTracer};
 
-use servo_util::tree::TreeNodeRef;
+use servo_util::tree::{TreeNodeRef, ElementLike};
 
 use std::libc;
 use std::ptr;

src/components/script/dom/htmlimageelement.rs

@@ -1,3 +1,4 @@
+
 /* 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/. */
@@ -11,6 +12,7 @@ use layout_interface::{ContentBoxQuery, ContentBoxResponse};
 use servo_net::image_cache_task;
 use servo_net::image_cache_task::ImageCacheTask;
 use servo_util::url::make_url;
+use servo_util::tree::ElementLike;
 
 pub struct HTMLImageElement {
     htmlelement: HTMLElement,

src/components/script/html/hubbub_html_parser.rs

@@ -26,7 +26,7 @@ use hubbub::hubbub;
 use servo_msg::constellation_msg::{ConstellationChan, SubpageId};
 use servo_net::image_cache_task::ImageCacheTask;
 use servo_net::resource_task::{Load, Payload, Done, ResourceTask};
-use servo_util::tree::TreeNodeRef;
+use servo_util::tree::{TreeNodeRef, ElementLike};
 use servo_util::url::make_url;
 use extra::url::Url;
 use extra::future::{Future, from_port};

src/components/script/script_task.rs

@@ -46,7 +46,7 @@ use js::rust::{Compartment, Cx};
 use js;
 use servo_net::image_cache_task::ImageCacheTask;
 use servo_net::resource_task::ResourceTask;
-use servo_util::tree::TreeNodeRef;
+use servo_util::tree::{TreeNodeRef, ElementLike};
 use servo_util::url::make_url;
 use extra::url::Url;
 use extra::future::{from_value, Future};

src/components/style/selector_matching.rs

@@ -11,6 +11,7 @@ use media_queries::{Device, Screen};
 use properties::{PropertyDeclaration, PropertyDeclarationBlock};
 use script::dom::node::{AbstractNode, ScriptView};
 use script::dom::element::Element;
+use servo_util::tree::ElementLike;
 
 
 pub enum StylesheetOrigin {
@@ -192,6 +193,7 @@ fn matches_simple_selector(selector: &SimpleSelector, element: &Element) -> bool
 
     match *selector {
         // TODO: case-sensitivity depends on the document type
+        // TODO: intern element names
         LocalNameSelector(ref name) => element.tag_name.eq_ignore_ascii_case(name.as_slice()),
         NamespaceSelector(_) => false,  // TODO, when the DOM supports namespaces on elements.
         // TODO: case-sensitivity depends on the document type and quirks mode

src/components/util/tree.rs

@@ -324,3 +324,9 @@ pub trait TreeNode<Ref: TreeNodeRef<Self>> {
         TreeNodeRef::<Self>::set_next_sibling(self, new_next_sibling)
     }
 }
+
+
+pub trait ElementLike<'self> {
+    fn get_local_name(&'self self) -> &'self str;
+    fn get_attr(&'self self, name: &str) -> Option<&'self str>;
+}