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/*
* Copyright (C) 2011 Google Inc. All Rights Reserved.
* Copyright (C) 2012, 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TreeScope.h"
#include "Attr.h"
#include "DOMWindow.h"
#include "ElementIterator.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameView.h"
#include "HTMLAnchorElement.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLImageElement.h"
#include "HTMLLabelElement.h"
#include "HTMLMapElement.h"
#include "HitTestResult.h"
#include "IdTargetObserverRegistry.h"
#include "NodeRareData.h"
#include "Page.h"
#include "PointerLockController.h"
#include "PseudoElement.h"
#include "RenderView.h"
#include "RuntimeEnabledFeatures.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include <wtf/text/CString.h>
namespace WebCore {
struct SameSizeAsTreeScope {
void* pointers[9];
};
COMPILE_ASSERT(sizeof(TreeScope) == sizeof(SameSizeAsTreeScope), treescope_should_stay_small);
using namespace HTMLNames;
TreeScope::TreeScope(ShadowRoot& shadowRoot, Document& document)
: m_rootNode(shadowRoot)
, m_documentScope(document)
, m_parentTreeScope(&document)
, m_idTargetObserverRegistry(std::make_unique<IdTargetObserverRegistry>())
{
shadowRoot.setTreeScope(*this);
}
TreeScope::TreeScope(Document& document)
: m_rootNode(document)
, m_documentScope(document)
, m_parentTreeScope(nullptr)
, m_idTargetObserverRegistry(std::make_unique<IdTargetObserverRegistry>())
{
document.setTreeScope(*this);
}
TreeScope::~TreeScope() = default;
void TreeScope::destroyTreeScopeData()
{
m_elementsById = nullptr;
m_elementsByName = nullptr;
m_imageMapsByName = nullptr;
m_imagesByUsemap = nullptr;
m_labelsByForAttribute = nullptr;
}
void TreeScope::setParentTreeScope(TreeScope& newParentScope)
{
// A document node cannot be re-parented.
ASSERT(!m_rootNode.isDocumentNode());
m_parentTreeScope = &newParentScope;
setDocumentScope(newParentScope.documentScope());
}
Element* TreeScope::getElementById(const AtomicString& elementId) const
{
if (elementId.isNull())
return nullptr;
if (!m_elementsById)
return nullptr;
return m_elementsById->getElementById(*elementId.impl(), *this);
}
Element* TreeScope::getElementById(const String& elementId) const
{
if (!m_elementsById)
return nullptr;
if (RefPtr<AtomicStringImpl> atomicElementId = AtomicStringImpl::lookUp(elementId.impl()))
return m_elementsById->getElementById(*atomicElementId, *this);
return nullptr;
}
Element* TreeScope::getElementById(StringView elementId) const
{
if (!m_elementsById)
return nullptr;
if (auto atomicElementId = elementId.toExistingAtomicString())
return m_elementsById->getElementById(*atomicElementId, *this);
return nullptr;
}
const Vector<Element*>* TreeScope::getAllElementsById(const AtomicString& elementId) const
{
if (elementId.isEmpty())
return nullptr;
if (!m_elementsById)
return nullptr;
return m_elementsById->getAllElementsById(*elementId.impl(), *this);
}
void TreeScope::addElementById(const AtomicStringImpl& elementId, Element& element, bool notifyObservers)
{
if (!m_elementsById)
m_elementsById = std::make_unique<TreeScopeOrderedMap>();
m_elementsById->add(elementId, element, *this);
if (notifyObservers)
m_idTargetObserverRegistry->notifyObservers(elementId);
}
void TreeScope::removeElementById(const AtomicStringImpl& elementId, Element& element, bool notifyObservers)
{
if (!m_elementsById)
return;
m_elementsById->remove(elementId, element);
if (notifyObservers)
m_idTargetObserverRegistry->notifyObservers(elementId);
}
Element* TreeScope::getElementByName(const AtomicString& name) const
{
if (name.isEmpty())
return nullptr;
if (!m_elementsByName)
return nullptr;
return m_elementsByName->getElementByName(*name.impl(), *this);
}
void TreeScope::addElementByName(const AtomicStringImpl& name, Element& element)
{
if (!m_elementsByName)
m_elementsByName = std::make_unique<TreeScopeOrderedMap>();
m_elementsByName->add(name, element, *this);
}
void TreeScope::removeElementByName(const AtomicStringImpl& name, Element& element)
{
if (!m_elementsByName)
return;
m_elementsByName->remove(name, element);
}
Node& TreeScope::retargetToScope(Node& node) const
{
auto& scope = node.treeScope();
if (LIKELY(this == &scope || !node.isInShadowTree()))
return node;
ASSERT(is<ShadowRoot>(scope.rootNode()));
Vector<TreeScope*, 8> nodeTreeScopes;
for (auto* currentScope = &scope; currentScope; currentScope = currentScope->parentTreeScope())
nodeTreeScopes.append(currentScope);
ASSERT(nodeTreeScopes.size() >= 2);
Vector<const TreeScope*, 8> ancestorScopes;
for (auto* currentScope = this; currentScope; currentScope = currentScope->parentTreeScope())
ancestorScopes.append(currentScope);
size_t i = nodeTreeScopes.size();
size_t j = ancestorScopes.size();
while (i > 0 && j > 0 && nodeTreeScopes[i - 1] == ancestorScopes[j - 1]) {
--i;
--j;
}
bool nodeIsInOuterTreeScope = !i;
if (nodeIsInOuterTreeScope)
return node;
ShadowRoot& shadowRootInLowestCommonTreeScope = downcast<ShadowRoot>(nodeTreeScopes[i - 1]->rootNode());
return *shadowRootInLowestCommonTreeScope.host();
}
Node* TreeScope::ancestorNodeInThisScope(Node* node) const
{
for (; node; node = node->shadowHost()) {
if (&node->treeScope() == this)
return node;
if (!node->isInShadowTree())
return nullptr;
}
return nullptr;
}
Element* TreeScope::ancestorElementInThisScope(Element* element) const
{
for (; element; element = element->shadowHost()) {
if (&element->treeScope() == this)
return element;
if (!element->isInShadowTree())
return nullptr;
}
return nullptr;
}
void TreeScope::addImageMap(HTMLMapElement& imageMap)
{
AtomicStringImpl* name = imageMap.getName().impl();
if (!name)
return;
if (!m_imageMapsByName)
m_imageMapsByName = std::make_unique<TreeScopeOrderedMap>();
m_imageMapsByName->add(*name, imageMap, *this);
}
void TreeScope::removeImageMap(HTMLMapElement& imageMap)
{
if (!m_imageMapsByName)
return;
AtomicStringImpl* name = imageMap.getName().impl();
if (!name)
return;
m_imageMapsByName->remove(*name, imageMap);
}
HTMLMapElement* TreeScope::getImageMap(const AtomicString& name) const
{
if (!m_imageMapsByName || !name.impl())
return nullptr;
return m_imageMapsByName->getElementByMapName(*name.impl(), *this);
}
void TreeScope::addImageElementByUsemap(const AtomicStringImpl& name, HTMLImageElement& element)
{
if (!m_imagesByUsemap)
m_imagesByUsemap = std::make_unique<TreeScopeOrderedMap>();
return m_imagesByUsemap->add(name, element, *this);
}
void TreeScope::removeImageElementByUsemap(const AtomicStringImpl& name, HTMLImageElement& element)
{
if (!m_imagesByUsemap)
return;
m_imagesByUsemap->remove(name, element);
}
HTMLImageElement* TreeScope::imageElementByUsemap(const AtomicStringImpl& name) const
{
if (!m_imagesByUsemap)
return nullptr;
return m_imagesByUsemap->getElementByUsemap(name, *this);
}
void TreeScope::addLabel(const AtomicStringImpl& forAttributeValue, HTMLLabelElement& element)
{
ASSERT(m_labelsByForAttribute);
m_labelsByForAttribute->add(forAttributeValue, element, *this);
}
void TreeScope::removeLabel(const AtomicStringImpl& forAttributeValue, HTMLLabelElement& element)
{
ASSERT(m_labelsByForAttribute);
m_labelsByForAttribute->remove(forAttributeValue, element);
}
HTMLLabelElement* TreeScope::labelElementForId(const AtomicString& forAttributeValue)
{
if (forAttributeValue.isEmpty())
return nullptr;
if (!m_labelsByForAttribute) {
// Populate the map on first access.
m_labelsByForAttribute = std::make_unique<TreeScopeOrderedMap>();
for (auto& label : descendantsOfType<HTMLLabelElement>(m_rootNode)) {
const AtomicString& forValue = label.attributeWithoutSynchronization(forAttr);
if (!forValue.isEmpty())
addLabel(*forValue.impl(), label);
}
}
return m_labelsByForAttribute->getElementByLabelForAttribute(*forAttributeValue.impl(), *this);
}
static Optional<LayoutPoint> absolutePointIfNotClipped(Document& document, const LayoutPoint& clientPoint)
{
if (!document.frame() || !document.view())
return WTF::nullopt;
const auto& settings = document.frame()->settings();
if (settings.visualViewportEnabled() && settings.clientCoordinatesRelativeToLayoutViewport()) {
document.updateLayout();
if (!document.view() || !document.hasLivingRenderTree())
return WTF::nullopt;
auto* view = document.view();
FloatPoint layoutViewportPoint = view->clientToLayoutViewportPoint(clientPoint);
FloatRect layoutViewportBounds({ }, view->layoutViewportRect().size());
if (!layoutViewportBounds.contains(layoutViewportPoint))
return WTF::nullopt;
return LayoutPoint(view->layoutViewportToAbsolutePoint(layoutViewportPoint));
}
auto* frame = document.frame();
auto* view = document.view();
float scaleFactor = frame->pageZoomFactor() * frame->frameScaleFactor();
LayoutPoint absolutePoint = clientPoint;
absolutePoint.scale(scaleFactor);
absolutePoint.moveBy(view->contentsScrollPosition());
LayoutRect visibleRect;
#if PLATFORM(IOS_FAMILY)
visibleRect = view->unobscuredContentRect();
#else
visibleRect = view->visibleContentRect();
#endif
if (visibleRect.contains(absolutePoint))
return absolutePoint;
return WTF::nullopt;
}
Node* TreeScope::nodeFromPoint(const LayoutPoint& clientPoint, LayoutPoint* localPoint)
{
auto absolutePoint = absolutePointIfNotClipped(documentScope(), clientPoint);
if (!absolutePoint)
return nullptr;
HitTestResult result(absolutePoint.value());
documentScope().renderView()->hitTest(HitTestRequest(), result);
if (localPoint)
*localPoint = result.localPoint();
return result.innerNode();
}
RefPtr<Element> TreeScope::elementFromPoint(double clientX, double clientY)
{
Document& document = documentScope();
if (!document.hasLivingRenderTree())
return nullptr;
Node* node = nodeFromPoint(LayoutPoint(clientX, clientY), nullptr);
if (!node)
return nullptr;
node = &retargetToScope(*node);
while (!is<Element>(*node)) {
node = node->parentInComposedTree();
if (!node)
break;
node = &retargetToScope(*node);
}
return downcast<Element>(node);
}
Vector<RefPtr<Element>> TreeScope::elementsFromPoint(double clientX, double clientY)
{
Vector<RefPtr<Element>> elements;
Document& document = documentScope();
if (!document.hasLivingRenderTree())
return elements;
auto absolutePoint = absolutePointIfNotClipped(document, LayoutPoint(clientX, clientY));
if (!absolutePoint)
return elements;
HitTestRequest request(HitTestRequest::ReadOnly
| HitTestRequest::Active
| HitTestRequest::DisallowUserAgentShadowContent
| HitTestRequest::CollectMultipleElements
| HitTestRequest::IncludeAllElementsUnderPoint);
HitTestResult result(absolutePoint.value());
documentScope().renderView()->hitTest(request, result);
Node* lastNode = nullptr;
for (const auto& listBasedNode : result.listBasedTestResult()) {
Node* node = listBasedNode.get();
node = &retargetToScope(*node);
while (!is<Element>(*node)) {
node = node->parentInComposedTree();
if (!node)
break;
node = &retargetToScope(*node);
}
if (!node)
continue;
if (is<PseudoElement>(node))
node = downcast<PseudoElement>(*node).hostElement();
// Prune duplicate entries. A pseudo ::before content above its parent
// node should only result in one entry.
if (node == lastNode)
continue;
elements.append(downcast<Element>(node));
lastNode = node;
}
if (m_rootNode.isDocumentNode()) {
if (Element* rootElement = downcast<Document>(m_rootNode).documentElement()) {
if (elements.isEmpty() || elements.last() != rootElement)
elements.append(rootElement);
}
}
return elements;
}
Vector<RefPtr<Element>> TreeScope::elementsFromPoint(const FloatPoint& p)
{
return elementsFromPoint(p.x(), p.y());
}
Element* TreeScope::findAnchor(const String& name)
{
if (name.isEmpty())
return nullptr;
if (Element* element = getElementById(name))
return element;
for (auto& anchor : descendantsOfType<HTMLAnchorElement>(m_rootNode)) {
if (m_rootNode.document().inQuirksMode()) {
// Quirks mode, ASCII case-insensitive comparison of names.
// FIXME: This behavior is not mentioned in the HTML specification.
// We should either remove this or get this into the specification.
if (equalIgnoringASCIICase(anchor.name(), name))
return &anchor;
} else {
// Strict mode, names need to match exactly.
if (anchor.name() == name)
return &anchor;
}
}
return nullptr;
}
static Element* focusedFrameOwnerElement(Frame* focusedFrame, Frame* currentFrame)
{
for (; focusedFrame; focusedFrame = focusedFrame->tree().parent()) {
if (focusedFrame->tree().parent() == currentFrame)
return focusedFrame->ownerElement();
}
return nullptr;
}
Element* TreeScope::focusedElementInScope()
{
Document& document = documentScope();
Element* element = document.focusedElement();
if (!element && document.page())
element = focusedFrameOwnerElement(document.page()->focusController().focusedFrame(), document.frame());
return ancestorElementInThisScope(element);
}
#if ENABLE(POINTER_LOCK)
Element* TreeScope::pointerLockElement() const
{
Document& document = documentScope();
Page* page = document.page();
if (!page || page->pointerLockController().lockPending())
return nullptr;
auto* element = page->pointerLockController().element();
if (!element || &element->document() != &document)
return nullptr;
return ancestorElementInThisScope(element);
}
#endif
static void listTreeScopes(Node* node, Vector<TreeScope*, 5>& treeScopes)
{
while (true) {
treeScopes.append(&node->treeScope());
Element* ancestor = node->shadowHost();
if (!ancestor)
break;
node = ancestor;
}
}
TreeScope* commonTreeScope(Node* nodeA, Node* nodeB)
{
if (!nodeA || !nodeB)
return nullptr;
if (&nodeA->treeScope() == &nodeB->treeScope())
return &nodeA->treeScope();
Vector<TreeScope*, 5> treeScopesA;
listTreeScopes(nodeA, treeScopesA);
Vector<TreeScope*, 5> treeScopesB;
listTreeScopes(nodeB, treeScopesB);
size_t indexA = treeScopesA.size();
size_t indexB = treeScopesB.size();
for (; indexA > 0 && indexB > 0 && treeScopesA[indexA - 1] == treeScopesB[indexB - 1]; --indexA, --indexB) { }
// If the nodes had no common tree scope, return immediately.
if (indexA == treeScopesA.size())
return nullptr;
return treeScopesA[indexA] == treeScopesB[indexB] ? treeScopesA[indexA] : nullptr;
}
} // namespace WebCore