blob: 9fe3afa47fef1f1c59aeff36ce1f0911f890b3a7 [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "EventTarget.h"
#include "ExceptionOr.h"
#include "LayoutRect.h"
#include "MutationObserver.h"
#include "RenderStyleConstants.h"
#include "StyleValidity.h"
#include "TreeScope.h"
#include <wtf/CompactPointerTuple.h>
#include <wtf/Forward.h>
#include <wtf/IsoMalloc.h>
#include <wtf/ListHashSet.h>
#include <wtf/MainThread.h>
#include <wtf/URLHash.h>
// This needs to be here because Document.h also depends on it.
#define DUMP_NODE_STATISTICS 0
namespace WebCore {
class ContainerNode;
class Document;
class Element;
class FloatPoint;
class HTMLQualifiedName;
class HTMLSlotElement;
class MathMLQualifiedName;
class NamedNodeMap;
class NodeList;
class NodeListsNodeData;
class NodeRareData;
class QualifiedName;
class RenderBox;
class RenderBoxModelObject;
class RenderObject;
class RenderStyle;
class SVGQualifiedName;
class ShadowRoot;
class TouchEvent;
using NodeOrString = Variant<RefPtr<Node>, String>;
class Node : public EventTarget {
WTF_MAKE_ISO_ALLOCATED(Node);
friend class Document;
friend class TreeScope;
public:
enum NodeType {
ELEMENT_NODE = 1,
ATTRIBUTE_NODE = 2,
TEXT_NODE = 3,
CDATA_SECTION_NODE = 4,
PROCESSING_INSTRUCTION_NODE = 7,
COMMENT_NODE = 8,
DOCUMENT_NODE = 9,
DOCUMENT_TYPE_NODE = 10,
DOCUMENT_FRAGMENT_NODE = 11,
};
enum DeprecatedNodeType {
ENTITY_REFERENCE_NODE = 5,
ENTITY_NODE = 6,
NOTATION_NODE = 12,
};
enum DocumentPosition {
DOCUMENT_POSITION_EQUIVALENT = 0x00,
DOCUMENT_POSITION_DISCONNECTED = 0x01,
DOCUMENT_POSITION_PRECEDING = 0x02,
DOCUMENT_POSITION_FOLLOWING = 0x04,
DOCUMENT_POSITION_CONTAINS = 0x08,
DOCUMENT_POSITION_CONTAINED_BY = 0x10,
DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20,
};
WEBCORE_EXPORT static void startIgnoringLeaks();
WEBCORE_EXPORT static void stopIgnoringLeaks();
static void dumpStatistics();
virtual ~Node();
void willBeDeletedFrom(Document&);
// DOM methods & attributes for Node
bool hasTagName(const HTMLQualifiedName&) const;
bool hasTagName(const MathMLQualifiedName&) const;
bool hasTagName(const SVGQualifiedName&) const;
virtual String nodeName() const = 0;
virtual String nodeValue() const;
virtual ExceptionOr<void> setNodeValue(const String&);
virtual NodeType nodeType() const = 0;
virtual size_t approximateMemoryCost() const { return sizeof(*this); }
ContainerNode* parentNode() const;
static ptrdiff_t parentNodeMemoryOffset() { return OBJECT_OFFSETOF(Node, m_parentNode); }
Element* parentElement() const;
Node* previousSibling() const { return m_previous; }
static ptrdiff_t previousSiblingMemoryOffset() { return OBJECT_OFFSETOF(Node, m_previous); }
Node* nextSibling() const { return m_next; }
static ptrdiff_t nextSiblingMemoryOffset() { return OBJECT_OFFSETOF(Node, m_next); }
WEBCORE_EXPORT RefPtr<NodeList> childNodes();
Node* firstChild() const;
Node* lastChild() const;
bool hasAttributes() const;
NamedNodeMap* attributes() const;
Node* pseudoAwareNextSibling() const;
Node* pseudoAwarePreviousSibling() const;
Node* pseudoAwareFirstChild() const;
Node* pseudoAwareLastChild() const;
WEBCORE_EXPORT const URL& baseURI() const;
void getSubresourceURLs(ListHashSet<URL>&) const;
WEBCORE_EXPORT ExceptionOr<void> insertBefore(Node& newChild, Node* refChild);
WEBCORE_EXPORT ExceptionOr<void> replaceChild(Node& newChild, Node& oldChild);
WEBCORE_EXPORT ExceptionOr<void> removeChild(Node& child);
WEBCORE_EXPORT ExceptionOr<void> appendChild(Node& newChild);
bool hasChildNodes() const { return firstChild(); }
enum class CloningOperation {
OnlySelf,
SelfWithTemplateContent,
Everything,
};
virtual Ref<Node> cloneNodeInternal(Document&, CloningOperation) = 0;
Ref<Node> cloneNode(bool deep) { return cloneNodeInternal(document(), deep ? CloningOperation::Everything : CloningOperation::OnlySelf); }
WEBCORE_EXPORT ExceptionOr<Ref<Node>> cloneNodeForBindings(bool deep);
virtual const AtomString& localName() const;
virtual const AtomString& namespaceURI() const;
virtual const AtomString& prefix() const;
virtual ExceptionOr<void> setPrefix(const AtomString&);
WEBCORE_EXPORT void normalize();
bool isSameNode(Node* other) const { return this == other; }
WEBCORE_EXPORT bool isEqualNode(Node*) const;
WEBCORE_EXPORT bool isDefaultNamespace(const AtomString& namespaceURI) const;
WEBCORE_EXPORT const AtomString& lookupPrefix(const AtomString& namespaceURI) const;
WEBCORE_EXPORT const AtomString& lookupNamespaceURI(const AtomString& prefix) const;
WEBCORE_EXPORT String textContent(bool convertBRsToNewlines = false) const;
WEBCORE_EXPORT ExceptionOr<void> setTextContent(const String&);
Node* lastDescendant() const;
Node* firstDescendant() const;
// From the NonDocumentTypeChildNode - https://dom.spec.whatwg.org/#nondocumenttypechildnode
WEBCORE_EXPORT Element* previousElementSibling() const;
WEBCORE_EXPORT Element* nextElementSibling() const;
// From the ChildNode - https://dom.spec.whatwg.org/#childnode
ExceptionOr<void> before(Vector<NodeOrString>&&);
ExceptionOr<void> after(Vector<NodeOrString>&&);
ExceptionOr<void> replaceWith(Vector<NodeOrString>&&);
WEBCORE_EXPORT ExceptionOr<void> remove();
// Other methods (not part of DOM)
bool isElementNode() const { return getFlag(IsElementFlag); }
bool isContainerNode() const { return getFlag(IsContainerFlag); }
bool isTextNode() const { return getFlag(IsTextFlag); }
bool isHTMLElement() const { return getFlag(IsHTMLFlag); }
bool isSVGElement() const { return getFlag(IsSVGFlag); }
bool isMathMLElement() const { return getFlag(IsMathMLFlag); }
bool isPseudoElement() const { return pseudoId() != PseudoId::None; }
bool isBeforePseudoElement() const { return pseudoId() == PseudoId::Before; }
bool isAfterPseudoElement() const { return pseudoId() == PseudoId::After; }
PseudoId pseudoId() const { return (isElementNode() && hasCustomStyleResolveCallbacks()) ? customPseudoId() : PseudoId::None; }
virtual bool isMediaControlElement() const { return false; }
virtual bool isMediaControls() const { return false; }
#if ENABLE(VIDEO_TRACK)
virtual bool isWebVTTElement() const { return false; }
#endif
bool isStyledElement() const { return getFlag(IsHTMLFlag) || getFlag(IsSVGFlag) || getFlag(IsMathMLFlag); }
virtual bool isAttributeNode() const { return false; }
virtual bool isCharacterDataNode() const { return false; }
virtual bool isFrameOwnerElement() const { return false; }
virtual bool isPluginElement() const { return false; }
#if ENABLE(SERVICE_CONTROLS)
virtual bool isImageControlsRootElement() const { return false; }
virtual bool isImageControlsButtonElement() const { return false; }
#endif
bool isDocumentNode() const { return getFlag(IsDocumentNodeFlag); }
bool isTreeScope() const { return getFlag(IsDocumentNodeFlag) || getFlag(IsShadowRootFlag); }
bool isDocumentFragment() const { return getFlag(IsContainerFlag) && !(getFlag(IsElementFlag) || getFlag(IsDocumentNodeFlag)); }
bool isShadowRoot() const { return getFlag(IsShadowRootFlag); }
bool hasCustomStyleResolveCallbacks() const { return getFlag(HasCustomStyleResolveCallbacksFlag); }
bool hasSyntheticAttrChildNodes() const { return getFlag(HasSyntheticAttrChildNodesFlag); }
void setHasSyntheticAttrChildNodes(bool flag) { setFlag(flag, HasSyntheticAttrChildNodesFlag); }
// If this node is in a shadow tree, returns its shadow host. Otherwise, returns null.
WEBCORE_EXPORT Element* shadowHost() const;
ShadowRoot* containingShadowRoot() const;
ShadowRoot* shadowRoot() const;
bool isClosedShadowHidden(const Node&) const;
HTMLSlotElement* assignedSlot() const;
HTMLSlotElement* assignedSlotForBindings() const;
bool isUndefinedCustomElement() const { return isElementNode() && getFlag(IsEditingTextOrUndefinedCustomElementFlag); }
bool isCustomElementUpgradeCandidate() const { return getFlag(IsCustomElement) && getFlag(IsEditingTextOrUndefinedCustomElementFlag); }
bool isDefinedCustomElement() const { return getFlag(IsCustomElement) && !getFlag(IsEditingTextOrUndefinedCustomElementFlag); }
bool isFailedCustomElement() const { return isElementNode() && !getFlag(IsCustomElement) && getFlag(IsEditingTextOrUndefinedCustomElementFlag); }
// Returns null, a child of ShadowRoot, or a legacy shadow root.
Node* nonBoundaryShadowTreeRootNode();
// Node's parent or shadow tree host.
ContainerNode* parentOrShadowHostNode() const;
ContainerNode* parentInComposedTree() const;
Element* parentElementInComposedTree() const;
Element* parentOrShadowHostElement() const;
void setParentNode(ContainerNode*);
Node& rootNode() const;
Node& traverseToRootNode() const;
Node& shadowIncludingRoot() const;
struct GetRootNodeOptions {
bool composed;
};
Node& getRootNode(const GetRootNodeOptions&) const;
void* opaqueRoot() const;
// Use when it's guaranteed to that shadowHost is null.
ContainerNode* parentNodeGuaranteedHostFree() const;
// Returns the parent node, but null if the parent node is a ShadowRoot.
ContainerNode* nonShadowBoundaryParentNode() const;
bool selfOrAncestorHasDirAutoAttribute() const { return getFlag(SelfOrAncestorHasDirAutoFlag); }
void setSelfOrAncestorHasDirAutoAttribute(bool flag) { setFlag(flag, SelfOrAncestorHasDirAutoFlag); }
// Returns the enclosing event parent Element (or self) that, when clicked, would trigger a navigation.
Element* enclosingLinkEventParentOrSelf();
// These low-level calls give the caller responsibility for maintaining the integrity of the tree.
void setPreviousSibling(Node* previous) { m_previous = previous; }
void setNextSibling(Node* next) { m_next = next; }
virtual bool canContainRangeEndPoint() const { return false; }
WEBCORE_EXPORT bool isRootEditableElement() const;
WEBCORE_EXPORT Element* rootEditableElement() const;
// Called by the parser when this element's close tag is reached,
// signaling that all child tags have been parsed and added.
// This is needed for <applet> and <object> elements, which can't lay themselves out
// until they know all of their nested <param>s. [Radar 3603191, 4040848].
// Also used for script elements and some SVG elements for similar purposes,
// but making parsing a special case in this respect should be avoided if possible.
virtual void finishParsingChildren() { }
virtual void beginParsingChildren() { }
// For <link> and <style> elements.
virtual bool sheetLoaded() { return true; }
virtual void notifyLoadedSheetAndAllCriticalSubresources(bool /* error loading subresource */) { }
virtual void startLoadingDynamicSheet() { ASSERT_NOT_REACHED(); }
bool isUserActionElement() const { return getFlag(IsUserActionElement); }
void setUserActionElement(bool flag) { setFlag(flag, IsUserActionElement); }
bool inRenderedDocument() const;
bool needsStyleRecalc() const { return styleValidity() != Style::Validity::Valid; }
Style::Validity styleValidity() const;
bool styleResolutionShouldRecompositeLayer() const;
bool childNeedsStyleRecalc() const { return getFlag(ChildNeedsStyleRecalcFlag); }
bool styleIsAffectedByPreviousSibling() const { return getFlag(StyleIsAffectedByPreviousSibling); }
bool isEditingText() const { return getFlag(IsTextFlag) && getFlag(IsEditingTextOrUndefinedCustomElementFlag); }
void setChildNeedsStyleRecalc() { setFlag(ChildNeedsStyleRecalcFlag); }
void clearChildNeedsStyleRecalc() { m_nodeFlags &= ~(ChildNeedsStyleRecalcFlag | DirectChildNeedsStyleRecalcFlag); }
void setHasValidStyle();
bool isLink() const { return getFlag(IsLinkFlag); }
void setIsLink(bool flag) { setFlag(flag, IsLinkFlag); }
bool hasEventTargetData() const { return getFlag(HasEventTargetDataFlag); }
void setHasEventTargetData(bool flag) { setFlag(flag, HasEventTargetDataFlag); }
enum UserSelectAllTreatment {
UserSelectAllDoesNotAffectEditability,
UserSelectAllIsAlwaysNonEditable
};
WEBCORE_EXPORT bool isContentEditable();
bool isContentRichlyEditable();
WEBCORE_EXPORT void inspect();
bool hasEditableStyle(UserSelectAllTreatment treatment = UserSelectAllIsAlwaysNonEditable) const
{
return computeEditability(treatment, ShouldUpdateStyle::DoNotUpdate) != Editability::ReadOnly;
}
// FIXME: Replace every use of this function by helpers in Editing.h
bool hasRichlyEditableStyle() const
{
return computeEditability(UserSelectAllIsAlwaysNonEditable, ShouldUpdateStyle::DoNotUpdate) == Editability::CanEditRichly;
}
enum class Editability { ReadOnly, CanEditPlainText, CanEditRichly };
enum class ShouldUpdateStyle { Update, DoNotUpdate };
WEBCORE_EXPORT Editability computeEditability(UserSelectAllTreatment, ShouldUpdateStyle) const;
WEBCORE_EXPORT LayoutRect renderRect(bool* isReplaced);
IntRect pixelSnappedRenderRect(bool* isReplaced) { return snappedIntRect(renderRect(isReplaced)); }
WEBCORE_EXPORT unsigned computeNodeIndex() const;
// Returns the DOM ownerDocument attribute. This method never returns null, except in the case
// of a Document node.
WEBCORE_EXPORT Document* ownerDocument() const;
// Returns the document associated with this node.
// A Document node returns itself.
Document& document() const
{
return treeScope().documentScope();
}
TreeScope& treeScope() const
{
ASSERT(m_treeScope);
return *m_treeScope;
}
void setTreeScopeRecursively(TreeScope&);
static ptrdiff_t treeScopeMemoryOffset() { return OBJECT_OFFSETOF(Node, m_treeScope); }
// Returns true if this node is associated with a document and is in its associated document's
// node tree, false otherwise (https://dom.spec.whatwg.org/#connected).
bool isConnected() const
{
return getFlag(IsConnectedFlag);
}
bool isInUserAgentShadowTree() const;
bool isInShadowTree() const { return getFlag(IsInShadowTreeFlag); }
bool isInTreeScope() const { return getFlag(static_cast<NodeFlags>(IsConnectedFlag | IsInShadowTreeFlag)); }
bool isDocumentTypeNode() const { return nodeType() == DOCUMENT_TYPE_NODE; }
virtual bool childTypeAllowed(NodeType) const { return false; }
unsigned countChildNodes() const;
Node* traverseToChildAt(unsigned) const;
ExceptionOr<void> checkSetPrefix(const AtomString& prefix);
WEBCORE_EXPORT bool isDescendantOf(const Node&) const;
bool isDescendantOf(const Node* other) const { return other && isDescendantOf(*other); }
bool isDescendantOrShadowDescendantOf(const Node*) const;
WEBCORE_EXPORT bool contains(const Node*) const;
bool containsIncludingShadowDOM(const Node*) const;
// Number of DOM 16-bit units contained in node. Note that rendered text length can be different - e.g. because of
// css-transform:capitalize breaking up precomposed characters and ligatures.
virtual int maxCharacterOffset() const;
// Whether or not a selection can be started in this object
virtual bool canStartSelection() const;
virtual bool shouldSelectOnMouseDown() { return false; }
// Getting points into and out of screen space
FloatPoint convertToPage(const FloatPoint&) const;
FloatPoint convertFromPage(const FloatPoint&) const;
// -----------------------------------------------------------------------------
// Integration with rendering tree
// As renderer() includes a branch you should avoid calling it repeatedly in hot code paths.
RenderObject* renderer() const { return m_rendererWithStyleFlags.pointer(); }
void setRenderer(RenderObject*); // Defined in RenderObject.h
// Use these two methods with caution.
WEBCORE_EXPORT RenderBox* renderBox() const;
RenderBoxModelObject* renderBoxModelObject() const;
// Wrapper for nodes that don't have a renderer, but still cache the style (like HTMLOptionElement).
const RenderStyle* renderStyle() const;
virtual const RenderStyle* computedStyle(PseudoId pseudoElementSpecifier = PseudoId::None);
enum class InsertedIntoAncestorResult {
Done,
NeedsPostInsertionCallback,
};
struct InsertionType {
bool connectedToDocument { false };
bool treeScopeChanged { false };
};
// Called *after* this node or its ancestor is inserted into a new parent (may or may not be a part of document) by scripts or parser.
// insertedInto **MUST NOT** invoke scripts. Return NeedsPostInsertionCallback and implement didFinishInsertingNode instead to run scripts.
virtual InsertedIntoAncestorResult insertedIntoAncestor(InsertionType, ContainerNode& parentOfInsertedTree);
virtual void didFinishInsertingNode() { }
struct RemovalType {
bool disconnectedFromDocument { false };
bool treeScopeChanged { false };
};
virtual void removedFromAncestor(RemovalType, ContainerNode& oldParentOfRemovedTree);
#if ENABLE(TREE_DEBUGGING)
virtual void formatForDebugger(char* buffer, unsigned length) const;
void showNode(const char* prefix = "") const;
void showTreeForThis() const;
void showNodePathForThis() const;
void showTreeAndMark(const Node* markedNode1, const char* markedLabel1, const Node* markedNode2 = nullptr, const char* markedLabel2 = nullptr) const;
void showTreeForThisAcrossFrame() const;
#endif // ENABLE(TREE_DEBUGGING)
void invalidateNodeListAndCollectionCachesInAncestors();
void invalidateNodeListAndCollectionCachesInAncestorsForAttribute(const QualifiedName& attrName);
NodeListsNodeData* nodeLists();
void clearNodeLists();
virtual bool willRespondToMouseMoveEvents();
virtual bool willRespondToMouseClickEvents();
virtual bool willRespondToMouseWheelEvents();
WEBCORE_EXPORT unsigned short compareDocumentPosition(Node&);
EventTargetInterface eventTargetInterface() const override;
ScriptExecutionContext* scriptExecutionContext() const final; // Implemented in Document.h
WEBCORE_EXPORT bool addEventListener(const AtomString& eventType, Ref<EventListener>&&, const AddEventListenerOptions&) override;
bool removeEventListener(const AtomString& eventType, EventListener&, const ListenerOptions&) override;
using EventTarget::dispatchEvent;
void dispatchEvent(Event&) override;
void dispatchScopedEvent(Event&);
virtual void handleLocalEvents(Event&, EventInvokePhase);
void dispatchSubtreeModifiedEvent();
void dispatchDOMActivateEvent(Event& underlyingClickEvent);
#if ENABLE(TOUCH_EVENTS)
virtual bool allowsDoubleTapGesture() const { return true; }
#endif
bool dispatchBeforeLoadEvent(const String& sourceURL);
WEBCORE_EXPORT void dispatchInputEvent();
// Perform the default action for an event.
virtual void defaultEventHandler(Event&);
void ref() const;
void deref() const;
bool hasOneRef() const;
unsigned refCount() const;
#if ASSERT_ENABLED
bool m_deletionHasBegun { false };
mutable bool m_inRemovedLastRefFunction { false };
bool m_adoptionIsRequired { true };
#endif
EventTargetData* eventTargetData() final;
EventTargetData* eventTargetDataConcurrently() final;
EventTargetData& ensureEventTargetData() final;
HashMap<Ref<MutationObserver>, MutationRecordDeliveryOptions> registeredMutationObservers(MutationObserver::MutationType, const QualifiedName* attributeName);
void registerMutationObserver(MutationObserver&, MutationObserverOptions, const HashSet<AtomString>& attributeFilter);
void unregisterMutationObserver(MutationObserverRegistration&);
void registerTransientMutationObserver(MutationObserverRegistration&);
void unregisterTransientMutationObserver(MutationObserverRegistration&);
void notifyMutationObserversNodeWillDetach();
WEBCORE_EXPORT void textRects(Vector<IntRect>&) const;
unsigned connectedSubframeCount() const;
void incrementConnectedSubframeCount(unsigned amount = 1);
void decrementConnectedSubframeCount(unsigned amount = 1);
void updateAncestorConnectedSubframeCountForRemoval() const;
void updateAncestorConnectedSubframeCountForInsertion() const;
#if ENABLE(JIT)
static ptrdiff_t nodeFlagsMemoryOffset() { return OBJECT_OFFSETOF(Node, m_nodeFlags); }
static ptrdiff_t rareDataMemoryOffset() { return OBJECT_OFFSETOF(Node, m_rareData); }
static int32_t flagIsText() { return IsTextFlag; }
static int32_t flagIsContainer() { return IsContainerFlag; }
static int32_t flagIsElement() { return IsElementFlag; }
static int32_t flagIsShadowRoot() { return IsShadowRootFlag; }
static int32_t flagIsHTML() { return IsHTMLFlag; }
static int32_t flagIsLink() { return IsLinkFlag; }
static int32_t flagHasFocusWithin() { return HasFocusWithin; }
static int32_t flagIsParsingChildrenFinished() { return IsParsingChildrenFinishedFlag; }
static int32_t flagChildrenAffectedByFirstChildRulesFlag() { return ChildrenAffectedByFirstChildRulesFlag; }
static int32_t flagChildrenAffectedByLastChildRulesFlag() { return ChildrenAffectedByLastChildRulesFlag; }
static int32_t flagAffectsNextSiblingElementStyle() { return AffectsNextSiblingElementStyle; }
static int32_t flagStyleIsAffectedByPreviousSibling() { return StyleIsAffectedByPreviousSibling; }
#endif // ENABLE(JIT)
protected:
enum NodeFlags {
IsTextFlag = 1,
IsContainerFlag = 1 << 1,
IsElementFlag = 1 << 2,
IsHTMLFlag = 1 << 3,
IsSVGFlag = 1 << 4,
IsMathMLFlag = 1 << 5,
IsDocumentNodeFlag = 1 << 6,
IsShadowRootFlag = 1 << 7,
IsConnectedFlag = 1 << 8,
IsInShadowTreeFlag = 1 << 9,
StyleAffectedByFocusWithinFlag = 1 << 10,
HasEventTargetDataFlag = 1 << 11,
// These bits are used by derived classes, pulled up here so they can
// be stored in the same memory word as the Node bits above.
ChildNeedsStyleRecalcFlag = 1 << 12, // ContainerNode
DirectChildNeedsStyleRecalcFlag = 1 << 13,
IsEditingTextOrUndefinedCustomElementFlag = 1 << 14, // Text and Element
IsCustomElement = 1 << 15, // Element
HasFocusWithin = 1 << 16,
IsLinkFlag = 1 << 17,
IsUserActionElement = 1 << 18,
IsParsingChildrenFinishedFlag = 1 << 19,
HasSyntheticAttrChildNodesFlag = 1 << 20,
SelfOrAncestorHasDirAutoFlag = 1 << 21,
// The following flags are used in style invalidation.
StyleValidityShift = 22,
StyleValidityMask = 3 << StyleValidityShift,
StyleResolutionShouldRecompositeLayerFlag = 1 << 24,
ChildrenAffectedByFirstChildRulesFlag = 1 << 25,
ChildrenAffectedByLastChildRulesFlag = 1 << 26,
ChildrenAffectedByHoverRulesFlag = 1 << 27,
AffectsNextSiblingElementStyle = 1 << 28,
StyleIsAffectedByPreviousSibling = 1 << 29,
DescendantsAffectedByPreviousSiblingFlag = 1 << 30,
HasCustomStyleResolveCallbacksFlag = 1 << 31,
DefaultNodeFlags = IsParsingChildrenFinishedFlag
};
bool getFlag(NodeFlags mask) const { return m_nodeFlags & mask; }
void setFlag(bool f, NodeFlags mask) const { m_nodeFlags = (m_nodeFlags & ~mask) | (-(int32_t)f & mask); }
void setFlag(NodeFlags mask) const { m_nodeFlags |= mask; }
void clearFlag(NodeFlags mask) const { m_nodeFlags &= ~mask; }
bool isParsingChildrenFinished() const { return getFlag(IsParsingChildrenFinishedFlag); }
void setIsParsingChildrenFinished() { setFlag(IsParsingChildrenFinishedFlag); }
void clearIsParsingChildrenFinished() { clearFlag(IsParsingChildrenFinishedFlag); }
enum ConstructionType {
CreateOther = DefaultNodeFlags,
CreateText = DefaultNodeFlags | IsTextFlag,
CreateContainer = DefaultNodeFlags | IsContainerFlag,
CreateElement = CreateContainer | IsElementFlag,
CreatePseudoElement = CreateElement | IsConnectedFlag,
CreateShadowRoot = CreateContainer | IsShadowRootFlag | IsInShadowTreeFlag,
CreateDocumentFragment = CreateContainer,
CreateHTMLElement = CreateElement | IsHTMLFlag,
CreateSVGElement = CreateElement | IsSVGFlag | HasCustomStyleResolveCallbacksFlag,
CreateMathMLElement = CreateElement | IsMathMLFlag,
CreateDocument = CreateContainer | IsDocumentNodeFlag | IsConnectedFlag,
CreateEditingText = CreateText | IsEditingTextOrUndefinedCustomElementFlag,
};
Node(Document&, ConstructionType);
static constexpr uint32_t s_refCountIncrement = 2;
static constexpr uint32_t s_refCountMask = ~static_cast<uint32_t>(1);
enum class ElementStyleFlag : uint8_t {
StyleAffectedByActive = 1 << 0,
StyleAffectedByEmpty = 1 << 1,
ChildrenAffectedByDrag = 1 << 2,
// Bits for dynamic child matching.
// We optimize for :first-child and :last-child. The other positional child selectors like nth-child or
// *-child-of-type, we will just give up and re-evaluate whenever children change at all.
ChildrenAffectedByForwardPositionalRules = 1 << 3,
DescendantsAffectedByForwardPositionalRules = 1 << 4,
ChildrenAffectedByBackwardPositionalRules = 1 << 5,
DescendantsAffectedByBackwardPositionalRules = 1 << 6,
ChildrenAffectedByPropertyBasedBackwardPositionalRules = 1 << 7,
};
bool hasStyleFlag(ElementStyleFlag state) const { return m_rendererWithStyleFlags.type() & static_cast<uint8_t>(state); }
void setStyleFlag(ElementStyleFlag state) { m_rendererWithStyleFlags.setType(m_rendererWithStyleFlags.type() | static_cast<uint8_t>(state)); }
void clearStyleFlags() { m_rendererWithStyleFlags.setType(0); }
virtual void addSubresourceAttributeURLs(ListHashSet<URL>&) const { }
bool hasRareData() const { return !!m_rareData; }
NodeRareData* rareData() const { return m_rareData.get(); }
NodeRareData& ensureRareData();
void clearRareData();
void clearEventTargetData();
void setHasCustomStyleResolveCallbacks() { setFlag(true, HasCustomStyleResolveCallbacksFlag); }
void setTreeScope(TreeScope& scope) { m_treeScope = &scope; }
void invalidateStyle(Style::Validity, Style::InvalidationMode = Style::InvalidationMode::Normal);
void updateAncestorsForStyleRecalc();
ExceptionOr<RefPtr<Node>> convertNodesOrStringsIntoNode(Vector<NodeOrString>&&);
private:
virtual PseudoId customPseudoId() const
{
ASSERT(hasCustomStyleResolveCallbacks());
return PseudoId::None;
}
WEBCORE_EXPORT void removedLastRef();
void refEventTarget() final;
void derefEventTarget() final;
bool isNode() const final;
void trackForDebugging();
void materializeRareData();
Vector<std::unique_ptr<MutationObserverRegistration>>* mutationObserverRegistry();
HashSet<MutationObserverRegistration*>* transientMutationObserverRegistry();
void adjustStyleValidity(Style::Validity, Style::InvalidationMode);
void* opaqueRootSlow() const;
static void moveShadowTreeToNewDocument(ShadowRoot&, Document& oldDocument, Document& newDocument);
static void moveTreeToNewScope(Node&, TreeScope& oldScope, TreeScope& newScope);
void moveNodeToNewDocument(Document& oldDocument, Document& newDocument);
struct NodeRareDataDeleter {
void operator()(NodeRareData*) const;
};
mutable uint32_t m_refCountAndParentBit { s_refCountIncrement };
mutable uint32_t m_nodeFlags;
ContainerNode* m_parentNode { nullptr };
TreeScope* m_treeScope { nullptr };
Node* m_previous { nullptr };
Node* m_next { nullptr };
CompactPointerTuple<RenderObject*, uint8_t> m_rendererWithStyleFlags;
std::unique_ptr<NodeRareData, NodeRareDataDeleter> m_rareData;
};
#if ASSERT_ENABLED
inline void adopted(Node* node)
{
if (!node)
return;
ASSERT(!node->m_deletionHasBegun);
ASSERT(!node->m_inRemovedLastRefFunction);
node->m_adoptionIsRequired = false;
}
#endif // ASSERT_ENABLED
ALWAYS_INLINE void Node::ref() const
{
ASSERT(isMainThread());
ASSERT(!m_deletionHasBegun);
ASSERT(!m_inRemovedLastRefFunction);
ASSERT(!m_adoptionIsRequired);
m_refCountAndParentBit += s_refCountIncrement;
}
ALWAYS_INLINE void Node::deref() const
{
ASSERT(isMainThread());
ASSERT(refCount());
ASSERT(!m_deletionHasBegun);
ASSERT(!m_inRemovedLastRefFunction);
ASSERT(!m_adoptionIsRequired);
auto updatedRefCount = m_refCountAndParentBit - s_refCountIncrement;
if (!updatedRefCount) {
// Don't update m_refCountAndParentBit to avoid double destruction through use of Ref<T>/RefPtr<T>.
// (This is a security mitigation in case of programmer error. It will ASSERT in debug builds.)
#if ASSERT_ENABLED
m_inRemovedLastRefFunction = true;
#endif
const_cast<Node&>(*this).removedLastRef();
return;
}
m_refCountAndParentBit = updatedRefCount;
}
ALWAYS_INLINE bool Node::hasOneRef() const
{
ASSERT(!m_deletionHasBegun);
ASSERT(!m_inRemovedLastRefFunction);
return refCount() == 1;
}
ALWAYS_INLINE unsigned Node::refCount() const
{
return m_refCountAndParentBit / s_refCountIncrement;
}
// Used in Node::addSubresourceAttributeURLs() and in addSubresourceStyleURLs()
inline void addSubresourceURL(ListHashSet<URL>& urls, const URL& url)
{
if (!url.isNull())
urls.add(url);
}
inline void Node::setParentNode(ContainerNode* parent)
{
ASSERT(isMainThread());
m_parentNode = parent;
m_refCountAndParentBit = (m_refCountAndParentBit & s_refCountMask) | !!parent;
}
inline ContainerNode* Node::parentNode() const
{
ASSERT(isMainThreadOrGCThread());
return m_parentNode;
}
inline void* Node::opaqueRoot() const
{
// FIXME: Possible race?
// https://bugs.webkit.org/show_bug.cgi?id=165713
if (isConnected())
return &document();
return opaqueRootSlow();
}
inline ContainerNode* Node::parentNodeGuaranteedHostFree() const
{
ASSERT(!isShadowRoot());
return parentNode();
}
inline Style::Validity Node::styleValidity() const
{
return static_cast<Style::Validity>((m_nodeFlags & StyleValidityMask) >> StyleValidityShift);
}
inline bool Node::styleResolutionShouldRecompositeLayer() const
{
return getFlag(StyleResolutionShouldRecompositeLayerFlag);
}
inline void Node::setHasValidStyle()
{
m_nodeFlags &= ~StyleValidityMask;
clearFlag(StyleResolutionShouldRecompositeLayerFlag);
}
inline void Node::setTreeScopeRecursively(TreeScope& newTreeScope)
{
ASSERT(!isDocumentNode());
ASSERT(!m_deletionHasBegun);
if (m_treeScope != &newTreeScope)
moveTreeToNewScope(*this, *m_treeScope, newTreeScope);
}
bool areNodesConnectedInSameTreeScope(const Node*, const Node*);
} // namespace WebCore
#if ENABLE(TREE_DEBUGGING)
// Outside the WebCore namespace for ease of invocation from the debugger.
void showTree(const WebCore::Node*);
void showNodePath(const WebCore::Node*);
#endif
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::Node)
static bool isType(const WebCore::EventTarget& target) { return target.isNode(); }
SPECIALIZE_TYPE_TRAITS_END()