void SVGUseElement::buildPendingResource()
{
if (inUseShadowTree())
return;
clearShadowTree();
cancelShadowTreeRecreation();
if (!referencedScope() || !inDocument())
return;
AtomicString id;
Element* target = SVGURIReference::targetElementFromIRIString(hrefString(), treeScope(), &id, externalDocument());
if (!target || !target->inDocument()) {
// If we can't find the target of an external element, just give up.
// We can't observe if the target somewhen enters the external document, nor should we do it.
if (externalDocument())
return;
if (id.isEmpty())
return;
referencedScope()->document().accessSVGExtensions().addPendingResource(id, this);
ASSERT(hasPendingResources());
return;
}
if (target->isSVGElement()) {
buildShadowAndInstanceTree(toSVGElement(target));
invalidateDependentShadowTrees();
}
ASSERT(!m_needsShadowTreeRecreation);
}
TreeScope* SVGUseElement::referencedScope() const
{
if (isStructurallyExternal())
return externalDocument();
return &treeScope();
}
Document* SVGUseElement::referencedDocument() const
{
if (!isExternalURIReference(href(), document()))
return &document();
return externalDocument();
}
