Add template parameter to ElementTraversal to iterate over Elements of a specific type

Source/core/html/HTMLTableRowsCollection.cpp

 /*
  * Copyright (C) 2008, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 37 matching lines @@
     return row->parentNode() && toElement(row->parentNode())->hasLocalName(tbodyTag);
 }
 
 static bool isInFoot(Element* row)
 {
     return row->parentNode() && toElement(row->parentNode())->hasLocalName(tfootTag);
 }
 
 static inline HTMLTableRowElement* findTableRowElementInChildren(Element& current)
 {
-    for (Element* child = ElementTraversal::firstWithin(current); child; child = ElementTraversal::nextSibling(*child)) {
-        if (isHTMLTableRowElement(child))
-            return toHTMLTableRowElement(child);
-    }
-    return 0;
+    return Traversal<HTMLTableRowElement>::firstChild(current);
 }
 
 HTMLTableRowElement* HTMLTableRowsCollection::rowAfter(HTMLTableElement& table, HTMLTableRowElement* previous)
 {
     Element* child = 0;
 
     // Start by looking for the next row in this section.
     // Continue only if there is none.
     if (previous && previous->parentNode() != table) {
-        for (child = ElementTraversal::nextSibling(*previous); child; child = ElementTraversal::nextSibling(*child)) {
-            if (isHTMLTableRowElement(child))
-                return toHTMLTableRowElement(child);
-        }
+        if (HTMLTableRowElement* row = Traversal<HTMLTableRowElement>::nextSibling(*previous))
+            return row;
     }
 
     // If still looking at head sections, find the first row in the next head section.
     if (!previous)
         child = ElementTraversal::firstWithin(table);
     else if (isInHead(previous))
         child = ElementTraversal::nextSibling(*previous->parentNode());
     for (; child; child = ElementTraversal::nextSibling(*child)) {
         if (child->hasTagName(theadTag)) {
             if (HTMLTableRowElement* row = findTableRowElementInChildren(*child))
@@ skipping 29 matching lines @@
         }
     }
 
     return 0;
 }
 
 HTMLTableRowElement* HTMLTableRowsCollection::lastRow(HTMLTableElement& table)
 {
     for (Node* child = table.lastChild(); child; child = child->previousSibling()) {
         if (child->hasTagName(tfootTag)) {
-            for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {
-                if (isHTMLTableRowElement(grandchild))
-                    return toHTMLTableRowElement(grandchild);
-            }
+            if (HTMLTableRowElement* lastRow = Traversal<HTMLTableRowElement>::lastChild(*child))
+                return lastRow;
         }
     }
 
     for (Node* child = table.lastChild(); child; child = child->previousSibling()) {
         if (isHTMLTableRowElement(child))
             return toHTMLTableRowElement(child);
         if (child->hasTagName(tbodyTag)) {
-            for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {
-                if (isHTMLTableRowElement(grandchild))
-                    return toHTMLTableRowElement(grandchild);
-            }
+            if (HTMLTableRowElement* lastRow = Traversal<HTMLTableRowElement>::lastChild(*child))
+                return lastRow;
         }
     }
 
     for (Node* child = table.lastChild(); child; child = child->previousSibling()) {
         if (child->hasTagName(theadTag)) {
-            for (Node* grandchild = child->lastChild(); grandchild; grandchild = grandchild->previousSibling()) {
-                if (isHTMLTableRowElement(grandchild))
-                    return toHTMLTableRowElement(grandchild);
-            }
+            if (HTMLTableRowElement* lastRow = Traversal<HTMLTableRowElement>::lastChild(*child))
+                return lastRow;
         }
     }
 
     return 0;
 }
 
 // Must call get() on the table in case that argument is compiled before dereferencing the
 // table to get at the collection cache. Order of argument evaluation is undefined and can
 // differ between compilers.
 HTMLTableRowsCollection::HTMLTableRowsCollection(ContainerNode* table)
     : HTMLCollection(table, TableRows, OverridesItemAfter)
 {
     ASSERT(isHTMLTableElement(table));
 }
 
 PassRefPtr<HTMLTableRowsCollection> HTMLTableRowsCollection::create(ContainerNode* table, CollectionType)
 {
     return adoptRef(new HTMLTableRowsCollection(table));
 }
 
 Element* HTMLTableRowsCollection::virtualItemAfter(Element* previous) const
 {
     return rowAfter(toHTMLTableElement(ownerNode()), toHTMLTableRowElement(previous));
 }
 
 }