void SVGUseElement::expandSymbolElementsInShadowTree(SVGElement* element)
{
ASSERT(element);
if (isSVGSymbolElement(*element)) {
// Spec: The referenced 'symbol' and its contents are deep-cloned into the generated tree,
// with the exception that the 'symbol' is replaced by an 'svg'. This generated 'svg' will
// always have explicit values for attributes width and height. If attributes width and/or
// height are provided on the 'use' element, then these attributes will be transferred to
// the generated 'svg'. If attributes width and/or height are not specified, the generated
// 'svg' element will use values of 100% for these attributes.
ASSERT(referencedScope());
RefPtrWillBeRawPtr<SVGSVGElement> svgElement = SVGSVGElement::create(referencedScope()->document());
// Transfer all data (attributes, etc.) from <symbol> to the new <svg> element.
svgElement->cloneDataFromElement(*element);
svgElement->setCorrespondingElement(element->correspondingElement());
// Move already cloned elements to the new <svg> element
for (RefPtrWillBeRawPtr<Node> child = element->firstChild(); child; ) {
RefPtrWillBeRawPtr<Node> nextChild = child->nextSibling();
svgElement->appendChild(child);
child = nextChild.release();
}
// We don't walk the target tree element-by-element, and clone each element,
// but instead use cloneNode(deep=true). This is an optimization for the common
// case where <use> doesn't contain disallowed elements (ie. <foreignObject>).
// Though if there are disallowed elements in the subtree, we have to remove them.
// For instance: <use> on <g> containing <foreignObject> (indirect case).
if (subtreeContainsDisallowedElement(svgElement.get()))
removeDisallowedElementsFromSubtree(*svgElement);
RefPtrWillBeRawPtr<SVGElement> replacingElement(svgElement.get());
// Replace <symbol> with <svg>.
ASSERT(element->parentNode());
element->parentNode()->replaceChild(svgElement.release(), element);
// Expand the siblings because the *element* is replaced and we will
// lose the sibling chain when we are back from recursion.
element = replacingElement.get();
for (RefPtrWillBeRawPtr<SVGElement> sibling = Traversal<SVGElement>::nextSibling(*element); sibling; sibling = Traversal<SVGElement>::nextSibling(*sibling))
expandSymbolElementsInShadowTree(sibling.get());
}
for (RefPtrWillBeRawPtr<SVGElement> child = Traversal<SVGElement>::firstChild(*element); child; child = Traversal<SVGElement>::nextSibling(*child))
expandSymbolElementsInShadowTree(child.get());
}
