Introduce isHTMLLabelElement and toHTMLLabelElement

Source/core/accessibility/AccessibilityRenderObject.cpp

 /*
 * Copyright (C) 2008 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 252 matching lines @@
 {
     if (!m_renderer)
         return 0;
 
     // the control element should not be considered part of the label
     if (isControl())
         return 0;
 
     // find if this has a parent that is a label
     for (Node* parentNode = m_renderer->node(); parentNode; parentNode = parentNode->parentNode()) {
-        if (parentNode->hasTagName(labelTag))
-            return static_cast<HTMLLabelElement*>(parentNode);
+        if (isHTMLLabelElement(parentNode))
+            return toHTMLLabelElement(parentNode);
     }
 
     return 0;
 }
 
 bool AccessibilityRenderObject::shouldNotifyActiveDescendant() const
 {
     // We want to notify that the combo box has changed its active descendant,
     // but we do not want to change the focus, because focus should remain with the combo box.
     if (isComboBox())
@@ skipping 112 matching lines @@
     // Table sections should be ignored.
     if (m_renderer->isTableSection())
         return IgnoredRole;
 
     if (m_renderer->isHR())
         return HorizontalRuleRole;
 
     if (node && node->hasTagName(pTag))
         return ParagraphRole;
 
-    if (node && node->hasTagName(labelTag))
+    if (node && isHTMLLabelElement(node))
         return LabelRole;
 
     if (node && node->hasTagName(divTag))
         return DivRole;
 
     if (node && node->hasTagName(formTag))
         return FormRole;
 
     if (node && node->hasTagName(articleTag))
         return DocumentArticleRole;
@@ skipping 300 matching lines @@
 
     // all controls are accessible
     if (isControl())
         return false;
 
     if (ariaRoleAttribute() != UnknownRole)
         return false;
 
     // don't ignore labels, because they serve as TitleUIElements
     Node* node = m_renderer->node();
-    if (node && node->hasTagName(labelTag))
+    if (node && isHTMLLabelElement(node))
         return false;
 
     // Anything that is content editable should not be ignored.
     // However, one cannot just call node->rendererIsEditable() since that will ask if its parents
     // are also editable. Only the top level content editable region should be exposed.
     if (hasContentEditableAttributeSet())
         return false;
 
     // List items play an important role in defining the structure of lists. They should not be ignored.
     if (roleValue() == ListItemRole)
@@ skipping 1772 matching lines @@
         if (label && label->renderer()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace WebCore