Have getElementsByClassName() / getElementsByTagName*() return an HTMLCollection

Source/core/html/HTMLCollection.cpp

Index: Source/core/html/HTMLCollection.cpp
diff --git a/Source/core/html/HTMLCollection.cpp b/Source/core/html/HTMLCollection.cpp
index 74a2ccf0becf9cf5c154c9dea46a34c189ff9430..cb25f06e0965dfcdf2fc2fa4e7c93ef8b1b661cc 100644
--- a/Source/core/html/HTMLCollection.cpp
+++ b/Source/core/html/HTMLCollection.cpp
@@ -24,7 +24,7 @@
 #include "core/html/HTMLCollection.h"
 
 #include "HTMLNames.h"
-#include "core/dom/ClassNodeList.h"
+#include "core/dom/ClassCollection.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeList.h"
 #include "core/dom/NodeRareData.h"
@@ -40,6 +40,9 @@ using namespace HTMLNames;
 static bool shouldOnlyIncludeDirectChildren(CollectionType type)
 {
     switch (type) {
+    case ClassCollectionType:
+    case TagCollectionType:
+    case HTMLTagCollectionType:
     case DocAll:
     case DocAnchors:
     case DocApplets:
@@ -63,10 +66,7 @@ static bool shouldOnlyIncludeDirectChildren(CollectionType type)
     case TableTBodies:
         return true;
     case ChildNodeListType:
-    case ClassNodeListType:
     case NameNodeListType:
-    case TagNodeListType:
-    case HTMLTagNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
@@ -91,6 +91,9 @@ static NodeListRootType rootTypeFromCollectionType(CollectionType type)
     case DocumentNamedItems:
     case FormControls:
         return NodeListIsRootedAtDocument;
+    case ClassCollectionType:
+    case TagCollectionType:
+    case HTMLTagCollectionType:
     case NodeChildren:
     case TableTBodies:
     case TSectionRows:
@@ -102,10 +105,7 @@ static NodeListRootType rootTypeFromCollectionType(CollectionType type)
     case MapAreas:
         return NodeListIsRootedAtNode;
     case ChildNodeListType:
-    case ClassNodeListType:
     case NameNodeListType:
-    case TagNodeListType:
-    case HTMLTagNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
@@ -118,6 +118,8 @@ static NodeListRootType rootTypeFromCollectionType(CollectionType type)
 static NodeListInvalidationType invalidationTypeExcludingIdAndNameAttributes(CollectionType type)
 {
     switch (type) {
+    case TagCollectionType:
+    case HTMLTagCollectionType:
     case DocImages:
     case DocEmbeds:
     case DocForms:
@@ -146,11 +148,10 @@ static NodeListInvalidationType invalidationTypeExcludingIdAndNameAttributes(Col
         return InvalidateOnIdNameAttrChange;
     case FormControls:
         return InvalidateForFormControls;
+    case ClassCollectionType:
+        return InvalidateOnClassAttrChange;
     case ChildNodeListType:
-    case ClassNodeListType:
     case NameNodeListType:
-    case TagNodeListType:
-    case HTMLTagNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
@@ -175,9 +176,11 @@ PassRefPtr<HTMLCollection> HTMLCollection::create(ContainerNode* base, Collectio
 
 HTMLCollection::~HTMLCollection()
 {
-    // HTMLNameCollection removes cache by itself.
-    if (type() != WindowNamedItems && type() != DocumentNamedItems)
+    // HTMLNameCollection, ClassCollection and TagCollection remove cache by themselves.
+    if (type() != WindowNamedItems && type() != DocumentNamedItems && type() != ClassCollectionType
+        && type() != HTMLTagCollectionType && type() != TagCollectionType) {
         ownerNode()->nodeLists()->removeCacheWithAtomicName(this, type());
+    }
 }
 
 void HTMLCollection::invalidateCache() const
@@ -192,7 +195,24 @@ inline bool isMatchingElement(const NodeListType&, const Element&);
 template <> inline bool isMatchingElement(const HTMLCollection& htmlCollection, const Element& element)
 {
     CollectionType type = htmlCollection.type();
-    if (!element.isHTMLElement() && !(type == DocAll || type == NodeChildren || type == WindowNamedItems))
+
+    // These collections apply to any kind of Elements, not just HTMLElements.
+    switch (type) {
+    case DocAll:
+    case NodeChildren:
+        return true;
+    case ClassCollectionType:
+        return static_cast<const ClassCollection&>(htmlCollection).elementMatches(element);
+    case TagCollectionType:
+        return static_cast<const TagCollection&>(htmlCollection).elementMatches(element);
+    case HTMLTagCollectionType:
+        return static_cast<const HTMLTagCollection&>(htmlCollection).elementMatches(element);
+    default:
+        break;
+    }
+
+    // The following only applies to HTMLElements.
+    if (!element.isHTMLElement())
         return false;
 
     switch (type) {
@@ -229,18 +249,17 @@ template <> inline bool isMatchingElement(const HTMLCollection& htmlCollection,
         return (element.hasLocalName(aTag) || element.hasLocalName(areaTag)) && element.fastHasAttribute(hrefAttr);
     case DocAnchors:
         return element.hasLocalName(aTag) && element.fastHasAttribute(nameAttr);
+    case ClassCollectionType:
+    case TagCollectionType:
+    case HTMLTagCollectionType:
     case DocAll:
     case NodeChildren:
-        return true;
     case FormControls:
     case DocumentNamedItems:
     case TableRows:
     case WindowNamedItems:
     case ChildNodeListType:
-    case ClassNodeListType:
     case NameNodeListType:
-    case TagNodeListType:
-    case HTMLTagNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
@@ -254,16 +273,6 @@ template <> inline bool isMatchingElement(const LiveNodeList& nodeList, const El
     return nodeList.nodeMatches(element);
 }
 
-template <> inline bool isMatchingElement(const HTMLTagNodeList& nodeList, const Element& element)
-{
-    return nodeList.nodeMatchesInlined(element);
-}
-
-template <> inline bool isMatchingElement(const ClassNodeList& nodeList, const Element& element)
-{
-    return nodeList.nodeMatchesInlined(element);
-}
-
 static Node* previousNode(const Node& base, const Node& previous, bool onlyIncludeDirectChildren)
 {
     return onlyIncludeDirectChildren ? previous.previousSibling() : NodeTraversal::previous(previous, &base);
@@ -362,10 +371,6 @@ inline Node* LiveNodeList::traverseToFirstElement(const ContainerNode& root) con
     switch (type()) {
     case ChildNodeListType:
         return root.firstChild();
-    case HTMLTagNodeListType:
-        return firstMatchingElement(static_cast<const HTMLTagNodeList&>(*this), root);
-    case ClassNodeListType:
-        return firstMatchingElement(static_cast<const ClassNodeList&>(*this), root);
     default:
         return firstMatchingElement(static_cast<const LiveNodeList&>(*this), root);
     }
@@ -378,10 +383,6 @@ inline Node* LiveNodeList::traverseForwardToOffset(unsigned offset, Node& curren
     switch (type()) {
     case ChildNodeListType:
         return traverseSiblingsForwardToOffset(offset, currentNode, currentOffset);
-    case HTMLTagNodeListType:
-        return traverseMatchingElementsForwardToOffset(static_cast<const HTMLTagNodeList&>(*this), offset, toElement(currentNode), currentOffset, root);
-    case ClassNodeListType:
-        return traverseMatchingElementsForwardToOffset(static_cast<const ClassNodeList&>(*this), offset, toElement(currentNode), currentOffset, root);
     default:
         return traverseMatchingElementsForwardToOffset(*this, offset, toElement(currentNode), currentOffset, root);
     }