Convert remaining RenderSVG* nodes to RenderObject::isChildAllowed

Source/core/rendering/svg/RenderSVGTransformableContainer.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 19 matching lines @@
 
 namespace WebCore {
 
 RenderSVGTransformableContainer::RenderSVGTransformableContainer(SVGGraphicsElement* node)
     : RenderSVGContainer(node)
     , m_needsTransformUpdate(true)
     , m_didTransformToRootUpdate(false)
 {
 }
 
+static bool hasValidPredecessor(const Node* node)
+{
+    ASSERT(node);
+    while ((node = node->previousSibling())) {
+        if (node->isSVGElement() && toSVGElement(node)->isValid())
+            return true;
+    }
+    return false;
+}
+
+bool RenderSVGTransformableContainer::isChildAllowed(RenderObject* child, RenderStyle* style) const
+{
+    if (element()->hasTagName(SVGNames::switchTag)) {
+        Node* node = child->node();
+        // Reject non-SVG/non-valid elements.
+        if (!node->isSVGElement() || !toSVGElement(node)->isValid())
+            return false;
+        // Reject this child if it isn't the first valid node.
+        if (hasValidPredecessor(node))
+            return false;
+    } else if (element()->hasTagName(SVGNames::aTag)) {
+        // http://www.w3.org/2003/01/REC-SVG11-20030114-errata#linking-text-environment
+        // The 'a' element may contain any element that its parent may contain, except itself.
+        if (child->node()->hasTagName(SVGNames::aTag))
+            return false;
+        if (parent() && parent()->isSVG())
+            return parent()->isChildAllowed(child, style);
+    }
+    return RenderSVGContainer::isChildAllowed(child, style);
+}
+
 bool RenderSVGTransformableContainer::calculateLocalTransform()
 {
     SVGGraphicsElement* element = toSVGGraphicsElement(this->element());
 
     // If we're either the renderer for a <use> element, or for any <g> element inside the shadow
     // tree, that was created during the use/symbol/svg expansion in SVGUseElement. These containers
     // need to respect the translations induced by their corresponding use elements x/y attributes.
     SVGUseElement* useElement = 0;
     if (element->hasTagName(SVGNames::useTag))
         useElement = toSVGUseElement(element);
@@ skipping 17 matching lines @@
     if (!m_needsTransformUpdate)
         return false;
 
     m_localTransform = element->animatedLocalTransform();
     m_localTransform.translate(m_lastTranslation.width(), m_lastTranslation.height());
     m_needsTransformUpdate = false;
     return true;
 }
 
 }