Element* SVGURIReference::targetElementFromIRIString(const String& iri, Document& document, String* fragmentIdentifier, Document* externalDocument)
{
// If there's no fragment identifier contained within the IRI string, we can't lookup an element.
String id;
KURL url = urlFromIRIStringWithFragmentIdentifier(iri, document, id);
if (url == KURL())
return 0;
if (fragmentIdentifier)
*fragmentIdentifier = id;
if (id.isEmpty())
return 0;
if (externalDocument) {
// Enforce that the referenced url matches the url of the document that we've loaded for it!
ASSERT(equalIgnoringFragmentIdentifier(url, externalDocument->url()));
return externalDocument->getElementById(id);
}
// Exit early if the referenced url is external, and we have no externalDocument given.
if (isExternalURIReference(iri, document))
return 0;
return document.getElementById(id);
}
void SVGUseElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (!isSupportedAttribute(attrName)) {
SVGGraphicsElement::svgAttributeChanged(attrName);
return;
}
SVGElementInstance::InvalidationGuard invalidationGuard(this);
auto renderer = this->renderer();
if (attrName == SVGNames::xAttr
|| attrName == SVGNames::yAttr
|| attrName == SVGNames::widthAttr
|| attrName == SVGNames::heightAttr) {
updateRelativeLengthsInformation();
if (renderer)
RenderSVGResource::markForLayoutAndParentResourceInvalidation(*renderer);
return;
}
if (SVGExternalResourcesRequired::handleAttributeChange(this, attrName))
return;
if (SVGURIReference::isKnownAttribute(attrName)) {
bool isExternalReference = isExternalURIReference(href(), document());
if (isExternalReference) {
URL url = document().completeURL(href());
if (url.hasFragmentIdentifier()) {
CachedResourceRequest request(ResourceRequest(url.string()));
request.setInitiator(this);
setCachedDocument(document().cachedResourceLoader()->requestSVGDocument(request));
}
} else
setCachedDocument(0);
if (!m_wasInsertedByParser)
buildPendingResource();
return;
}
if (SVGLangSpace::isKnownAttribute(attrName)
|| SVGExternalResourcesRequired::isKnownAttribute(attrName)) {
invalidateShadowTree();
return;
}
ASSERT_NOT_REACHED();
}
Document* SVGUseElement::referencedDocument() const
{
if (!isExternalURIReference(href(), document()))
return &document();
return externalDocument();
}