[SVG] refactor determineAnimatedPropertyType logic.

Source/core/svg/SVGAnimationElement.cpp

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 470 matching lines @@
 {
     ASSERT(!m_keyPoints.isEmpty());
     ASSERT(m_keyPoints.size() == m_keyTimes.size());
     ASSERT(calcMode() != CalcModePaced);
     effectivePercent = calculatePercentFromKeyPoints(percent);
     unsigned index = effectivePercent == 1 ? m_values.size() - 2 : static_cast<unsigned>(effectivePercent * (m_values.size() - 1));
     from = m_values[index];
     to = m_values[index + 1];
 }
 
+AnimatedPropertyType SVGAnimationElement::determineAnimatedPropertyType() const
+{
+    if (!targetElement())
+        return AnimatedString;
+
+    RefPtr<NewSVGAnimatedPropertyBase> property = targetElement()->propertyFromAttribute(attributeName());
+    if (property) {
+        AnimatedPropertyType propertyType = property->type();
+
+        // Only <animatedTransform> is allowed to animate AnimatedTransformList.
+        // http://www.w3.org/TR/SVG/animate.html#AnimationAttributesAndProperties
+        if (propertyType == AnimatedTransformList && !hasTagName(SVGNames::animateTransformTag))
+            return AnimatedUnknown;
+
+        return propertyType;
+    }
+
+    return SVGElement::animatedPropertyTypeForCSSAttribute(attributeName());
+}
+
 void SVGAnimationElement::currentValuesForValuesAnimation(float percent, float& effectivePercent, String& from, String& to)
 {
     unsigned valuesCount = m_values.size();
     ASSERT(m_animationValid);
     ASSERT(valuesCount >= 1);
 
     if (percent == 1 || valuesCount == 1) {
         from = m_values[valuesCount - 1];
         to = m_values[valuesCount - 1];
         effectivePercent = 1;
         return;
     }
 
     CalcMode calcMode = this->calcMode();
     if (hasTagName(SVGNames::animateTag)) {
-        AnimatedPropertyType attributeType = toSVGAnimateElement(this)->determineAnimatedPropertyType(targetElement());
+        AnimatedPropertyType attributeType = determineAnimatedPropertyType();
         // Fall back to discrete animations for Strings.
         if (attributeType == AnimatedBoolean
             || attributeType == AnimatedEnumeration
             || attributeType == AnimatedPreserveAspectRatio
             || attributeType == AnimatedString)
             calcMode = CalcModeDiscrete;
     }
     if (!m_keyPoints.isEmpty() && calcMode != CalcModePaced)
         return currentValuesFromKeyPoints(percent, effectivePercent, from, to);
 
@@ skipping 174 matching lines @@
     SVGSMILElement::setAttributeName(attributeName);
     checkInvalidCSSAttributeType(targetElement());
 }
 
 void SVGAnimationElement::checkInvalidCSSAttributeType(SVGElement* target)
 {
     m_hasInvalidCSSAttributeType = target && hasValidAttributeName() && attributeType() == AttributeTypeCSS && !isTargetAttributeCSSProperty(target, attributeName());
 }
 
 }