static void associateReplacementCloneWithOriginal(SVGElement& replacementClone, SVGElement& originalClone)
{
auto* correspondingElement = originalClone.correspondingElement();
ASSERT(correspondingElement);
originalClone.setCorrespondingElement(nullptr);
replacementClone.setCorrespondingElement(correspondingElement);
}
static void associateClonesWithOriginals(SVGElement& clone, SVGElement& original)
{
// This assertion checks that we don't call this with the arguments backwards.
// The clone is new and so it's not installed in a parent yet.
ASSERT(!clone.parentNode());
// The loop below works because we are associating these clones immediately, before
// doing transformations like removing disallowed elements or expanding elements.
clone.setCorrespondingElement(&original);
for (auto pair : descendantsOfType<SVGElement>(clone, original))
pair.first.setCorrespondingElement(&pair.second);
}
void SVGElement::invalidateInstances()
{
if (instanceUpdatesBlocked())
return;
auto& instances = this->instances();
while (!instances.isEmpty()) {
SVGElement* instance = *instances.begin();
if (SVGUseElement* useElement = instance->correspondingUseElement())
useElement->invalidateShadowTree();
instance->setCorrespondingElement(nullptr);
} while (!instances.isEmpty());
}
void SVGUseElement::associateInstancesWithShadowTreeElements(Node* target, SVGElementInstance* targetInstance)
{
if (!target || !targetInstance)
return;
SVGElement* originalElement = targetInstance->correspondingElement();
if (originalElement->hasTagName(SVGNames::useTag)) {
// <use> gets replaced by <g>
ASSERT(target->nodeName() == SVGNames::gTag);
} else if (originalElement->hasTagName(SVGNames::symbolTag)) {
// <symbol> gets replaced by <svg>
ASSERT(target->nodeName() == SVGNames::svgTag);
} else
ASSERT(target->nodeName() == originalElement->nodeName());
SVGElement* element = 0;
if (target->isSVGElement())
element = toSVGElement(target);
ASSERT(!targetInstance->shadowTreeElement());
targetInstance->setShadowTreeElement(element);
element->setCorrespondingElement(originalElement);
Node* node = target->firstChild();
for (SVGElementInstance* instance = targetInstance->firstChild(); node && instance; instance = instance->nextSibling()) {
// Skip any non-svg elements in shadow tree
while (node && !node->isSVGElement())
node = node->nextSibling();
if (!node)
break;
associateInstancesWithShadowTreeElements(node, instance);
node = node->nextSibling();
}
}
