void SVGUseElement::buildPendingResource()
{
if (!referencedDocument() || isInShadowTree())
return;
clearResourceReferences();
if (!inDocument())
return;
String id;
Element* target = SVGURIReference::targetElementFromIRIString(href(), document(), &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;
referencedDocument()->accessSVGExtensions()->addPendingResource(id, this);
ASSERT(hasPendingResources());
return;
}
if (target->isSVGElement()) {
buildShadowAndInstanceTree(toSVGElement(target));
invalidateDependentShadowTrees();
}
ASSERT(!m_needsShadowTreeRecreation);
}
Node::InsertionNotificationRequest SVGSMILElement::insertedInto(ContainerNode& rootParent)
{
SVGElement::insertedInto(rootParent);
if (!rootParent.inDocument())
return InsertionDone;
// Verify we are not in <use> instance tree.
ASSERT(!isInShadowTree());
setAttributeName(constructQualifiedName(this, fastGetAttribute(SVGNames::attributeNameAttr)));
SVGSVGElement* owner = ownerSVGElement();
if (!owner)
return InsertionDone;
m_timeContainer = owner->timeContainer();
ASSERT(m_timeContainer);
m_timeContainer->setDocumentOrderIndexesDirty();
// "If no attribute is present, the default begin value (an offset-value of 0) must be evaluated."
if (!fastHasAttribute(SVGNames::beginAttr))
m_beginTimes.append(SMILTimeWithOrigin());
if (m_isWaitingForFirstInterval)
resolveFirstInterval();
if (m_timeContainer)
m_timeContainer->notifyIntervalsChanged();
buildPendingResource();
return InsertionDone;
}
void SVGTRefElement::buildPendingResource()
{
// Remove any existing event listener.
m_targetListener->detach();
// If we're not yet in a document, this function will be called again from insertedInto().
if (!inDocument())
return;
String id;
RefPtr<Element> target = SVGURIReference::targetElementFromIRIString(href(), document(), &id);
if (!target.get()) {
if (id.isEmpty())
return;
document().accessSVGExtensions().addPendingResource(id, this);
ASSERT(hasPendingResources());
return;
}
// Don't set up event listeners if this is a shadow tree node.
// SVGUseElement::transferEventListenersToShadowTree() handles this task, and addEventListener()
// expects every element instance to have an associated shadow tree element - which is not the
// case when we land here from SVGUseElement::buildShadowTree().
if (!isInShadowTree())
m_targetListener->attach(target);
updateReferencedText(target.get());
}
String SVGElement::title() const
{
// According to spec, we should not return titles when hovering over root <svg> elements (those
// <title> elements are the title of the document, not a tooltip) so we instantly return.
if (isOutermostSVGSVGElement())
return String();
// Walk up the tree, to find out whether we're inside a <use> shadow tree, to find the right title.
if (isInShadowTree()) {
Element* shadowHostElement = toShadowRoot(treeScope().rootNode()).host();
// At this time, SVG nodes are not allowed in non-<use> shadow trees, so any shadow root we do
// have should be a use. The assert and following test is here to catch future shadow DOM changes
// that do enable SVG in a shadow tree.
ASSERT(!shadowHostElement || isSVGUseElement(*shadowHostElement));
if (isSVGUseElement(shadowHostElement)) {
SVGUseElement& useElement = toSVGUseElement(*shadowHostElement);
// If the <use> title is not empty we found the title to use.
String useTitle(useElement.title());
if (!useTitle.isEmpty())
return useTitle;
}
}
// If we aren't an instance in a <use> or the <use> title was not found, then find the first
// <title> child of this element.
// If a title child was found, return the text contents.
if (Element* titleElement = Traversal<SVGTitleElement>::firstChild(*this))
return titleElement->innerText();
// Otherwise return a null/empty string.
return String();
}
void HTMLImportElement::insertedInto(ContainerNode* insertionPoint)
{
HTMLElement::insertedInto(insertionPoint);
if (!insertionPoint->inDocument() || isInShadowTree())
return;
if (shouldLoad())
load();
}
void HTMLLinkElement::insertedIntoDocument()
{
HTMLElement::insertedIntoDocument();
m_isInShadowTree = isInShadowTree();
if (m_isInShadowTree)
return;
document()->addStyleSheetCandidateNode(this, m_createdByParser);
process();
}
void CharacterData::dispatchModifiedEvent(const String& oldData)
{
if (OwnPtr<MutationObserverInterestGroup> mutationRecipients = MutationObserverInterestGroup::createForCharacterDataMutation(this))
mutationRecipients->enqueueMutationRecord(MutationRecord::createCharacterData(this, oldData));
if (!isInShadowTree()) {
if (parentNode())
parentNode()->childrenChanged();
if (document()->hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER))
dispatchScopedEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, true, 0, oldData, m_data));
dispatchSubtreeModifiedEvent();
}
InspectorInstrumentation::characterDataModified(document(), this);
}
void CharacterData::didModifyData(const String& oldData, UpdateSource source)
{
if (OwnPtrWillBeRawPtr<MutationObserverInterestGroup> mutationRecipients = MutationObserverInterestGroup::createForCharacterDataMutation(*this))
mutationRecipients->enqueueMutationRecord(MutationRecord::createCharacterData(this, oldData));
if (parentNode()) {
ContainerNode::ChildrenChange change = {ContainerNode::TextChanged, previousSibling(), nextSibling(), ContainerNode::ChildrenChangeSourceAPI};
parentNode()->childrenChanged(change);
}
// Skip DOM mutation events if the modification is from parser.
// Note that mutation observer events will still fire.
// Spec: https://html.spec.whatwg.org/multipage/syntax.html#insert-a-character
if (source != UpdateFromParser && !isInShadowTree()) {
if (document().hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER))
dispatchScopedEvent(MutationEvent::create(EventTypeNames::DOMCharacterDataModified, true, nullptr, oldData, m_data));
dispatchSubtreeModifiedEvent();
}
InspectorInstrumentation::characterDataModified(this);
}
bool SVGElement::isOutermostSVGSVGElement() const
{
if (!hasTagName(SVGNames::svgTag))
return false;
// If we're living in a shadow tree, we're a <svg> element that got created as replacement
// for a <symbol> element or a cloned <svg> element in the referenced tree. In that case
// we're always an inner <svg> element.
if (isInShadowTree() && parentOrShadowHostElement() && parentOrShadowHostElement()->isSVGElement())
return false;
// Element may not be in the document, pretend we're outermost for viewport(), getCTM(), etc.
if (!parentNode())
return true;
// We act like an outermost SVG element, if we're a direct child of a <foreignObject> element.
if (parentNode()->hasTagName(SVGNames::foreignObjectTag))
return true;
// This is true whenever this is the outermost SVG, even if there are HTML elements outside it
return !parentNode()->isSVGElement();
}
void CharacterData::dispatchModifiedEvent(const String& oldData)
{
if (std::unique_ptr<MutationObserverInterestGroup> mutationRecipients = MutationObserverInterestGroup::createForCharacterDataMutation(*this))
mutationRecipients->enqueueMutationRecord(MutationRecord::createCharacterData(*this, oldData));
if (!isInShadowTree()) {
if (parentNode()) {
ContainerNode::ChildChange change = {
ContainerNode::TextChanged,
ElementTraversal::previousSibling(*this),
ElementTraversal::nextSibling(*this),
ContainerNode::ChildChangeSourceAPI
};
parentNode()->childrenChanged(change);
}
if (document().hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER))
dispatchScopedEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, true, nullptr, oldData, m_data));
dispatchSubtreeModifiedEvent();
}
InspectorInstrumentation::characterDataModified(document(), *this);
}
void SVGElement::buildPendingResourcesIfNeeded()
{
Document& document = this->document();
if (!needsPendingResourceHandling() || !inDocument() || isInShadowTree())
return;
SVGDocumentExtensions& extensions = document.accessSVGExtensions();
AtomicString resourceId = getIdAttribute();
if (!extensions.hasPendingResource(resourceId))
return;
// Mark pending resources as pending for removal.
extensions.markPendingResourcesForRemoval(resourceId);
// Rebuild pending resources for each client of a pending resource that is being removed.
while (Element* clientElement = extensions.removeElementFromPendingResourcesForRemoval(resourceId)) {
ASSERT(clientElement->hasPendingResources());
if (clientElement->hasPendingResources()) {
clientElement->buildPendingResource();
extensions.clearHasPendingResourcesIfPossible(clientElement);
}
}
}
void HTMLTitleElement::childrenChanged(const ChildrenChange& change)
{
HTMLElement::childrenChanged(change);
if (inDocument() && !isInShadowTree() && !m_ignoreTitleUpdatesWhenChildrenChange)
document().setTitleElement(this);
}
void SVGUseElement::buildShadowAndInstanceTree(SVGElement* target)
{
ASSERT(!m_targetElementInstance);
// Do not build the shadow/instance tree for <use> elements living in a shadow tree.
// The will be expanded soon anyway - see expandUseElementsInShadowTree().
if (isInShadowTree())
return;
// Do not allow self-referencing.
// 'target' may be null, if it's a non SVG namespaced element.
if (!target || target == this)
return;
// Why a seperated instance/shadow tree? SVG demands it:
// The instance tree is accesable from JavaScript, and has to
// expose a 1:1 copy of the referenced tree, whereas internally we need
// to alter the tree for correct "use-on-symbol", "use-on-svg" support.
// Build instance tree. Create root SVGElementInstance object for the first sub-tree node.
//
// Spec: If the 'use' element references a simple graphics element such as a 'rect', then there is only a
// single SVGElementInstance object, and the correspondingElement attribute on this SVGElementInstance object
// is the SVGRectElement that corresponds to the referenced 'rect' element.
m_targetElementInstance = SVGElementInstance::create(this, this, target);
// Eventually enter recursion to build SVGElementInstance objects for the sub-tree children
bool foundProblem = false;
buildInstanceTree(target, m_targetElementInstance.get(), foundProblem, false);
if (instanceTreeIsLoading(m_targetElementInstance.get()))
return;
// SVG specification does not say a word about <use> & cycles. My view on this is: just ignore it!
// Non-appearing <use> content is easier to debug, then half-appearing content.
if (foundProblem) {
clearResourceReferences();
return;
}
// Assure instance tree building was successfull
ASSERT(m_targetElementInstance);
ASSERT(!m_targetElementInstance->shadowTreeElement());
ASSERT(m_targetElementInstance->correspondingUseElement() == this);
ASSERT(m_targetElementInstance->directUseElement() == this);
ASSERT(m_targetElementInstance->correspondingElement() == target);
ShadowRoot* shadowTreeRootElement = shadowRoot();
ASSERT(shadowTreeRootElement);
// Build shadow tree from instance tree
// This also handles the special cases: <use> on <symbol>, <use> on <svg>.
buildShadowTree(target, m_targetElementInstance.get());
// Expand all <use> elements in the shadow tree.
// Expand means: replace the actual <use> element by what it references.
expandUseElementsInShadowTree(shadowTreeRootElement);
// Expand all <symbol> elements in the shadow tree.
// Expand means: replace the actual <symbol> element by the <svg> element.
expandSymbolElementsInShadowTree(shadowTreeRootElement);
// Now that the shadow tree is completly expanded, we can associate
// shadow tree elements <-> instances in the instance tree.
associateInstancesWithShadowTreeElements(shadowTreeRootElement->firstChild(), m_targetElementInstance.get());
// If no shadow tree element is present, this means that the reference root
// element was removed, as it is disallowed (ie. <use> on <foreignObject>)
// Do NOT leave an inconsistent instance tree around, instead destruct it.
if (!m_targetElementInstance->shadowTreeElement()) {
clearResourceReferences();
return;
}
ASSERT(m_targetElementInstance->shadowTreeElement()->parentNode() == shadowTreeRootElement);
// Transfer event listeners assigned to the referenced element to our shadow tree elements.
transferEventListenersToShadowTree(m_targetElementInstance.get());
// Update relative length information.
updateRelativeLengthsInformation();
// Eventually dump instance tree
#ifdef DUMP_INSTANCE_TREE
String text;
unsigned int depth = 0;
dumpInstanceTree(depth, text, m_targetElementInstance.get());
fprintf(stderr, "\nDumping <use> instance tree:\n%s\n", text.latin1().data());
#endif
// Eventually dump shadow tree
#ifdef DUMP_SHADOW_TREE
RefPtr<XMLSerializer> serializer = XMLSerializer::create();
String markup = serializer->serializeToString(shadowTreeRootElement, ASSERT_NO_EXCEPTION);
fprintf(stderr, "Dumping <use> shadow tree markup:\n%s\n", markup.latin1().data());
#endif
}
void HTMLTitleElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
{
HTMLElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
if (inDocument() && !isInShadowTree() && !m_ignoreTitleUpdatesWhenChildrenChange)
document().setTitleElement(text(), this);
}
