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Diffstat (limited to 'dom/base/nsINode.h')
| -rw-r--r-- | dom/base/nsINode.h | 2544 |
1 files changed, 2544 insertions, 0 deletions
diff --git a/dom/base/nsINode.h b/dom/base/nsINode.h new file mode 100644 index 0000000000..ce9fbd55be --- /dev/null +++ b/dom/base/nsINode.h @@ -0,0 +1,2544 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef nsINode_h___ +#define nsINode_h___ + +#include "mozilla/DoublyLinkedList.h" +#include "mozilla/Likely.h" +#include "mozilla/UniquePtr.h" +#include "nsCOMPtr.h" // for member, local +#include "nsGkAtoms.h" // for nsGkAtoms::baseURIProperty +#include "mozilla/dom/NodeInfo.h" // member (in nsCOMPtr) +#include "nsIWeakReference.h" +#include "nsIMutationObserver.h" +#include "nsNodeInfoManager.h" // for use in NodePrincipal() +#include "nsPropertyTable.h" // for typedefs +#include "mozilla/ErrorResult.h" +#include "mozilla/LinkedList.h" +#include "mozilla/MemoryReporting.h" +#include "mozilla/dom/EventTarget.h" // for base class +#include "js/TypeDecls.h" // for Handle, Value, JSObject, JSContext +#include "mozilla/dom/DOMString.h" +#include "mozilla/dom/BindingDeclarations.h" +#include "mozilla/dom/NodeBinding.h" +#include "nsTHashtable.h" +#include <iosfwd> + +// Including 'windows.h' will #define GetClassInfo to something else. +#ifdef XP_WIN +# ifdef GetClassInfo +# undef GetClassInfo +# endif +#endif + +class AttrArray; +class nsAttrChildContentList; +template <typename T> +class nsCOMArray; +class nsDOMAttributeMap; +class nsGenericHTMLElement; +class nsIAnimationObserver; +class nsIContent; +class nsIContentSecurityPolicy; +class nsIFrame; +class nsIHTMLCollection; +class nsMultiMutationObserver; +class nsINode; +class nsINodeList; +class nsIPrincipal; +class nsIURI; +class nsNodeSupportsWeakRefTearoff; +class nsDOMMutationObserver; +class nsRange; +class nsWindowSizes; + +namespace mozilla { +class EventListenerManager; +struct StyleSelectorList; +template <typename T> +class Maybe; +class PresShell; +class TextEditor; +namespace dom { +/** + * @return true if aChar is what the WHATWG defines as a 'ascii whitespace'. + * https://infra.spec.whatwg.org/#ascii-whitespace + */ +inline bool IsSpaceCharacter(char16_t aChar) { + return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' || + aChar == '\f'; +} +inline bool IsSpaceCharacter(char aChar) { + return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' || + aChar == '\f'; +} +class AbstractRange; +class AccessibleNode; +template <typename T> +class AncestorsOfTypeIterator; +struct BoxQuadOptions; +struct ConvertCoordinateOptions; +class DocGroup; +class Document; +class DocumentFragment; +class DocumentOrShadowRoot; +class DOMPoint; +class DOMQuad; +class DOMRectReadOnly; +class Element; +class EventHandlerNonNull; +template <typename T> +class FlatTreeAncestorsOfTypeIterator; +template <typename T> +class InclusiveAncestorsOfTypeIterator; +template <typename T> +class InclusiveFlatTreeAncestorsOfTypeIterator; +class LinkStyle; +class MutationObservers; +template <typename T> +class Optional; +class OwningNodeOrString; +template <typename> +class Sequence; +class ShadowRoot; +class SVGUseElement; +class Text; +class TextOrElementOrDocument; +struct DOMPointInit; +struct GetRootNodeOptions; +enum class CallerType : uint32_t; +} // namespace dom +} // namespace mozilla + +#define NODE_FLAG_BIT(n_) \ + (nsWrapperCache::FlagsType(1U) << (WRAPPER_CACHE_FLAGS_BITS_USED + (n_))) + +enum : uint32_t { + // This bit will be set if the node has a listener manager. + NODE_HAS_LISTENERMANAGER = NODE_FLAG_BIT(0), + + // Whether this node has had any properties set on it + NODE_HAS_PROPERTIES = NODE_FLAG_BIT(1), + + // Whether the node has some ancestor, possibly itself, that is native + // anonymous. This includes ancestors crossing XBL scopes, in cases when an + // XBL binding is attached to an element which has a native anonymous + // ancestor. This flag is set-once: once a node has it, it must not be + // removed. + // NOTE: Should only be used on nsIContent nodes + NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE = NODE_FLAG_BIT(2), + + // Whether this node is the root of a native anonymous (from the perspective + // of its parent) subtree. This flag is set-once: once a node has it, it + // must not be removed. + // NOTE: Should only be used on nsIContent nodes + NODE_IS_NATIVE_ANONYMOUS_ROOT = NODE_FLAG_BIT(3), + + NODE_IS_EDITABLE = NODE_FLAG_BIT(4), + + // Whether the node participates in a shadow tree. + NODE_IS_IN_SHADOW_TREE = NODE_FLAG_BIT(5), + + // This node needs to go through frame construction to get a frame (or + // undisplayed entry). + NODE_NEEDS_FRAME = NODE_FLAG_BIT(6), + + // At least one descendant in the flattened tree has NODE_NEEDS_FRAME set. + // This should be set on every node on the flattened tree path between the + // node(s) with NODE_NEEDS_FRAME and the root content. + NODE_DESCENDANTS_NEED_FRAMES = NODE_FLAG_BIT(7), + + // Set if the node has the accesskey attribute set. + NODE_HAS_ACCESSKEY = NODE_FLAG_BIT(8), + + NODE_HAS_BEEN_IN_UA_WIDGET = NODE_FLAG_BIT(9), + + // Set if the node has a nonce value and a header delivered CSP. + NODE_HAS_NONCE_AND_HEADER_CSP = NODE_FLAG_BIT(10), + + NODE_KEEPS_DOMARENA = NODE_FLAG_BIT(11), + + NODE_MAY_HAVE_ELEMENT_CHILDREN = NODE_FLAG_BIT(12), + + // Remaining bits are node type specific. + NODE_TYPE_SPECIFIC_BITS_OFFSET = 13 +}; + +// Flags for selectors that persist to the DOM node. +enum class NodeSelectorFlags : uint32_t { + // Node has an :empty or :-moz-only-whitespace selector + HasEmptySelector = 1 << 0, + + /// A child of the node has a selector such that any insertion, + /// removal, or appending of children requires restyling the parent, if the + /// parent is an element. If the parent is the shadow root, the child's + /// siblings are restyled. + HasSlowSelector = 1 << 1, + + /// A child of the node has a :first-child, :-moz-first-node, + /// :only-child, :last-child or :-moz-last-node selector. + HasEdgeChildSelector = 1 << 2, + + /// A child of the node has a selector such that any insertion or + /// removal of children requires restyling later siblings of that + /// element. Additionally (in this manner it is stronger than + /// NODE_HAS_SLOW_SELECTOR), if a child's style changes due to any + /// other content tree changes (e.g., the child changes to or from + /// matching :empty due to a grandchild insertion or removal), the + /// child's later siblings must also be restyled. + HasSlowSelectorLaterSiblings = 1 << 3, + + /// HasSlowSelector* was set by the presence of :nth (But not of). + HasSlowSelectorNth = 1 << 4, + + /// A child of this node might be matched by :nth-child(.. of <selector>) or + /// :nth-last-child(.. of <selector>). If a DOM mutation may have caused the + /// selector to either match or no longer match that child, the child's + /// siblings are restyled. + HasSlowSelectorNthOf = 1 << 5, + + /// All instances of :nth flags. + HasSlowSelectorNthAll = HasSlowSelectorNthOf | HasSlowSelectorNth, + + /// Set of selector flags that may trigger a restyle on DOM append, with + /// restyle on siblings or a single parent (And perhaps their subtrees). + AllSimpleRestyleFlagsForAppend = HasEmptySelector | HasSlowSelector | + HasEdgeChildSelector | HasSlowSelectorNthAll, + + /// Set of selector flags that may trigger a restyle as a result of any + /// DOM mutation. + AllSimpleRestyleFlags = + AllSimpleRestyleFlagsForAppend | HasSlowSelectorLaterSiblings, + + // This node was evaluated as an anchor for a relative selector. + RelativeSelectorAnchor = 1 << 6, + + // This node was evaluated as an anchor for a relative selector, and that + // relative selector was not the subject of the overall selector. + RelativeSelectorAnchorNonSubject = 1 << 7, + + // This node's sibling(s) performed a relative selector search to this node. + RelativeSelectorSearchDirectionSibling = 1 << 8, + + // This node's ancestor(s) performed a relative selector search to this node. + RelativeSelectorSearchDirectionAncestor = 1 << 9, + + // This node's sibling(s) and ancestor(s), and/or this node's ancestor's + // sibling(s) performed a relative selector search to this node. + RelativeSelectorSearchDirectionAncestorSibling = + RelativeSelectorSearchDirectionSibling | + RelativeSelectorSearchDirectionAncestor, +}; + +MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(NodeSelectorFlags); + +// Make sure we have space for our bits +#define ASSERT_NODE_FLAGS_SPACE(n) \ + static_assert(WRAPPER_CACHE_FLAGS_BITS_USED + (n) <= \ + sizeof(nsWrapperCache::FlagsType) * 8, \ + "Not enough space for our bits") +ASSERT_NODE_FLAGS_SPACE(NODE_TYPE_SPECIFIC_BITS_OFFSET); + +/** + * Class used to detect unexpected mutations. To use the class create an + * nsMutationGuard on the stack before unexpected mutations could occur. + * You can then at any time call Mutated to check if any unexpected mutations + * have occurred. + */ +class nsMutationGuard { + public: + nsMutationGuard() { mStartingGeneration = sGeneration; } + + /** + * Returns true if any unexpected mutations have occurred. You can pass in + * an 8-bit ignore count to ignore a number of expected mutations. + * + * We don't need to care about overflow because subtraction of uint64_t's is + * finding the difference between two elements of the group Z < 2^64. Once + * we know the difference between two elements we only need to check that is + * less than the given number of mutations to know less than that many + * mutations occured. Assuming constant 1ns mutations it would take 584 + * years for sGeneration to fully wrap around so we can ignore a guard living + * through a full wrap around. + */ + bool Mutated(uint8_t aIgnoreCount) { + return (sGeneration - mStartingGeneration) > aIgnoreCount; + } + + // This function should be called whenever a mutation that we want to keep + // track of happen. For now this is only done when children are added or + // removed, but we might do it for attribute changes too in the future. + static void DidMutate() { sGeneration++; } + + private: + // This is the value sGeneration had when the guard was constructed. + uint64_t mStartingGeneration; + + // This value is incremented on every mutation, for the life of the process. + static uint64_t sGeneration; +}; + +/** + * A class that implements nsIWeakReference + */ +class nsNodeWeakReference final : public nsIWeakReference { + public: + explicit nsNodeWeakReference(nsINode* aNode); + + // nsISupports + NS_DECL_ISUPPORTS + + // nsIWeakReference + NS_DECL_NSIWEAKREFERENCE + + void NoticeNodeDestruction() { mObject = nullptr; } + + private: + ~nsNodeWeakReference(); +}; + +// This should be used for any nsINode sub-class that has fields of its own +// that it needs to measure; any sub-class that doesn't use it will inherit +// AddSizeOfExcludingThis from its super-class. AddSizeOfIncludingThis() need +// not be defined, it is inherited from nsINode. +#define NS_DECL_ADDSIZEOFEXCLUDINGTHIS \ + virtual void AddSizeOfExcludingThis(nsWindowSizes& aSizes, \ + size_t* aNodeSize) const override; + +// IID for the nsINode interface +// Must be kept in sync with xpcom/rust/xpcom/src/interfaces/nonidl.rs +#define NS_INODE_IID \ + { \ + 0x70ba4547, 0x7699, 0x44fc, { \ + 0xb3, 0x20, 0x52, 0xdb, 0xe3, 0xd1, 0xf9, 0x0a \ + } \ + } + +/** + * An internal interface that abstracts some DOMNode-related parts that both + * nsIContent and Document share. An instance of this interface has a list + * of nsIContent children and provides access to them. + */ +class nsINode : public mozilla::dom::EventTarget { +#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED + void AssertInvariantsOnNodeInfoChange(); +#endif + public: + using BoxQuadOptions = mozilla::dom::BoxQuadOptions; + using ConvertCoordinateOptions = mozilla::dom::ConvertCoordinateOptions; + using DocGroup = mozilla::dom::DocGroup; + using Document = mozilla::dom::Document; + using DOMPoint = mozilla::dom::DOMPoint; + using DOMPointInit = mozilla::dom::DOMPointInit; + using DOMQuad = mozilla::dom::DOMQuad; + using DOMRectReadOnly = mozilla::dom::DOMRectReadOnly; + using OwningNodeOrString = mozilla::dom::OwningNodeOrString; + using TextOrElementOrDocument = mozilla::dom::TextOrElementOrDocument; + using CallerType = mozilla::dom::CallerType; + using ErrorResult = mozilla::ErrorResult; + + // XXXbz Maybe we should codegen a class holding these constants and + // inherit from it... + static const auto ELEMENT_NODE = mozilla::dom::Node_Binding::ELEMENT_NODE; + static const auto ATTRIBUTE_NODE = mozilla::dom::Node_Binding::ATTRIBUTE_NODE; + static const auto TEXT_NODE = mozilla::dom::Node_Binding::TEXT_NODE; + static const auto CDATA_SECTION_NODE = + mozilla::dom::Node_Binding::CDATA_SECTION_NODE; + static const auto ENTITY_REFERENCE_NODE = + mozilla::dom::Node_Binding::ENTITY_REFERENCE_NODE; + static const auto ENTITY_NODE = mozilla::dom::Node_Binding::ENTITY_NODE; + static const auto PROCESSING_INSTRUCTION_NODE = + mozilla::dom::Node_Binding::PROCESSING_INSTRUCTION_NODE; + static const auto COMMENT_NODE = mozilla::dom::Node_Binding::COMMENT_NODE; + static const auto DOCUMENT_NODE = mozilla::dom::Node_Binding::DOCUMENT_NODE; + static const auto DOCUMENT_TYPE_NODE = + mozilla::dom::Node_Binding::DOCUMENT_TYPE_NODE; + static const auto DOCUMENT_FRAGMENT_NODE = + mozilla::dom::Node_Binding::DOCUMENT_FRAGMENT_NODE; + static const auto NOTATION_NODE = mozilla::dom::Node_Binding::NOTATION_NODE; + static const auto MAX_NODE_TYPE = NOTATION_NODE; + + void* operator new(size_t aSize, nsNodeInfoManager* aManager); + void* operator new(size_t aSize) = delete; + void operator delete(void* aPtr); + + template <class T> + using Sequence = mozilla::dom::Sequence<T>; + + NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID) + + // The |aNodeSize| outparam on this function is where the actual node size + // value is put. It gets added to the appropriate value within |aSizes| by + // AddSizeOfNodeTree(). + // + // Among the sub-classes that inherit (directly or indirectly) from nsINode, + // measurement of the following members may be added later if DMD finds it is + // worthwhile: + // - nsGenericHTMLElement: mForm, mFieldSet + // - nsGenericHTMLFrameElement: mFrameLoader (bug 672539) + // - HTMLBodyElement: mContentStyleRule + // - HTMLDataListElement: mOptions + // - HTMLFieldSetElement: mElements, mDependentElements, mFirstLegend + // - HTMLFormElement: many! + // - HTMLFrameSetElement: mRowSpecs, mColSpecs + // - HTMLInputElement: mInputData, mFiles, mFileList, mStaticDocfileList + // - nsHTMLMapElement: mAreas + // - HTMLMediaElement: many! + // - nsHTMLOutputElement: mDefaultValue, mTokenList + // - nsHTMLRowElement: mCells + // - nsHTMLSelectElement: mOptions, mRestoreState + // - nsHTMLTableElement: mTBodies, mRows, mTableInheritedAttributes + // - nsHTMLTableSectionElement: mRows + // - nsHTMLTextAreaElement: mControllers, mState + // + // The following members don't need to be measured: + // - nsIContent: mPrimaryFrame, because it's non-owning and measured elsewhere + // + virtual void AddSizeOfExcludingThis(nsWindowSizes& aSizes, + size_t* aNodeSize) const; + + // SizeOfIncludingThis doesn't need to be overridden by sub-classes because + // sub-classes of nsINode are guaranteed to be laid out in memory in such a + // way that |this| points to the start of the allocated object, even in + // methods of nsINode's sub-classes, so aSizes.mState.mMallocSizeOf(this) is + // always safe to call no matter which object it was invoked on. + void AddSizeOfIncludingThis(nsWindowSizes& aSizes, size_t* aNodeSize) const; + + friend class nsNodeWeakReference; + friend class nsNodeSupportsWeakRefTearoff; + friend class AttrArray; + +#ifdef MOZILLA_INTERNAL_API + explicit nsINode(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo); +#endif + + virtual ~nsINode(); + + bool IsContainerNode() const { + return IsElement() || IsDocument() || IsDocumentFragment(); + } + + /** + * Returns true if the node is a HTMLTemplate element. + */ + bool IsTemplateElement() const { return IsHTMLElement(nsGkAtoms::_template); } + + bool IsSlotable() const { return IsElement() || IsText(); } + + /** + * Returns true if this is a document node. + */ + bool IsDocument() const { + // One less pointer-chase than checking NodeType(). + return !GetParentNode() && IsInUncomposedDoc(); + } + + /** + * Return this node as a document. Asserts IsDocument(). + * + * This is defined inline in Document.h. + */ + inline Document* AsDocument(); + inline const Document* AsDocument() const; + + /** + * Returns true if this is a document fragment node. + */ + bool IsDocumentFragment() const { + return NodeType() == DOCUMENT_FRAGMENT_NODE; + } + + virtual bool IsHTMLFormControlElement() const { return false; } + + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-descendant + * + * @param aNode must not be nullptr. + */ + bool IsInclusiveDescendantOf(const nsINode* aNode) const; + + /** + * https://dom.spec.whatwg.org/#concept-shadow-including-inclusive-descendant + * + * @param aNode must not be nullptr. + */ + bool IsShadowIncludingInclusiveDescendantOf(const nsINode* aNode) const; + + /** + * Returns true if the given node is this node or one of its descendants + * in the "flat tree." + * + * @param aNode must not be nullptr. + */ + bool IsInclusiveFlatTreeDescendantOf(const nsINode* aNode) const; + + /** + * Return this node as a document fragment. Asserts IsDocumentFragment(). + * + * This is defined inline in DocumentFragment.h. + */ + inline mozilla::dom::DocumentFragment* AsDocumentFragment(); + inline const mozilla::dom::DocumentFragment* AsDocumentFragment() const; + + JSObject* WrapObject(JSContext*, JS::Handle<JSObject*> aGivenProto) final; + + /** + * Hook for constructing JS::ubi::Concrete specializations for memory + * reporting. Specializations are defined in NodeUbiReporting.h. + */ + virtual void ConstructUbiNode(void* storage) = 0; + + /** + * returns true if we are in priviliged code or + * layout.css.getBoxQuads.enabled == true. + */ + static bool HasBoxQuadsSupport(JSContext* aCx, JSObject* /* unused */); + + protected: + /** + * WrapNode is called from WrapObject to actually wrap this node, WrapObject + * does some additional checks and fix-up that's common to all nodes. WrapNode + * should just call the DOM binding's Wrap function. + * + * aGivenProto is the prototype to use (or null if the default one should be + * used) and should just be passed directly on to the DOM binding's Wrap + * function. + */ + virtual JSObject* WrapNode(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) = 0; + + public: + mozilla::dom::ParentObject GetParentObject() + const; // Implemented in Document.h + + /** + * Returns the first child of a node or the first child of + * a template element's content if the provided node is a + * template element. + */ + nsIContent* GetFirstChildOfTemplateOrNode(); + + /** + * Return the scope chain parent for this node, for use in things + * like event handler compilation. Returning null means to use the + * global object as the scope chain parent. + */ + virtual nsINode* GetScopeChainParent() const; + + MOZ_CAN_RUN_SCRIPT mozilla::dom::Element* GetParentFlexElement(); + + /** + * Returns the nearest inclusive open popover for a given node, see + * https://html.spec.whatwg.org/multipage/popover.html#nearest-inclusive-open-popover + */ + mozilla::dom::Element* GetNearestInclusiveOpenPopover() const; + + /** + * https://html.spec.whatwg.org/multipage/popover.html#nearest-inclusive-target-popover-for-invoker + */ + mozilla::dom::Element* GetNearestInclusiveTargetPopoverForInvoker() const; + + /** + * https://html.spec.whatwg.org/multipage/popover.html#popover-target-element + */ + nsGenericHTMLElement* GetEffectivePopoverTargetElement() const; + + /** + * https://html.spec.whatwg.org/multipage/popover.html#topmost-clicked-popover + */ + mozilla::dom::Element* GetTopmostClickedPopover() const; + + bool IsNode() const final { return true; } + + NS_IMPL_FROMEVENTTARGET_HELPER(nsINode, IsNode()) + + /** + * Return whether the node is an Element node. Faster than using `NodeType()`. + */ + bool IsElement() const { return GetBoolFlag(NodeIsElement); } + + virtual bool IsTextControlElement() const { return false; } + virtual bool IsGenericHTMLFormControlElementWithState() const { + return false; + } + + // Returns non-null if this element subclasses `LinkStyle`. + virtual const mozilla::dom::LinkStyle* AsLinkStyle() const { return nullptr; } + mozilla::dom::LinkStyle* AsLinkStyle() { + return const_cast<mozilla::dom::LinkStyle*>( + static_cast<const nsINode*>(this)->AsLinkStyle()); + } + + /** + * Return this node as an Element. Should only be used for nodes + * for which IsElement() is true. This is defined inline in Element.h. + */ + inline mozilla::dom::Element* AsElement(); + inline const mozilla::dom::Element* AsElement() const; + + /** + * Return whether the node is an nsStyledElement instance or not. + */ + virtual bool IsStyledElement() const { return false; } + + /** + * Return this node as nsIContent. Should only be used for nodes for which + * IsContent() is true. + * + * The assertion in nsIContent's constructor makes this safe. + */ + nsIContent* AsContent() { + MOZ_ASSERT(IsContent()); + return reinterpret_cast<nsIContent*>(this); + } + const nsIContent* AsContent() const { + MOZ_ASSERT(IsContent()); + return reinterpret_cast<const nsIContent*>(this); + } + + /* + * Return whether the node is a Text node (which might be an actual + * textnode, or might be a CDATA section). + */ + bool IsText() const { + uint32_t nodeType = NodeType(); + return nodeType == TEXT_NODE || nodeType == CDATA_SECTION_NODE; + } + + /** + * Return this node as Text if it is one, otherwise null. This is defined + * inline in Text.h. + */ + inline mozilla::dom::Text* GetAsText(); + inline const mozilla::dom::Text* GetAsText() const; + + /** + * Return this node as Text. Asserts IsText(). This is defined inline in + * Text.h. + */ + inline mozilla::dom::Text* AsText(); + inline const mozilla::dom::Text* AsText() const; + + /* + * Return whether the node is a ProcessingInstruction node. + */ + bool IsProcessingInstruction() const { + return NodeType() == PROCESSING_INSTRUCTION_NODE; + } + + /* + * Return whether the node is a CharacterData node (text, cdata, + * comment, processing instruction) + */ + bool IsCharacterData() const { + uint32_t nodeType = NodeType(); + return nodeType == TEXT_NODE || nodeType == CDATA_SECTION_NODE || + nodeType == PROCESSING_INSTRUCTION_NODE || nodeType == COMMENT_NODE; + } + + /** + * Return whether the node is a Comment node. + */ + bool IsComment() const { return NodeType() == COMMENT_NODE; } + + /** + * Return whether the node is an Attr node. + */ + bool IsAttr() const { return NodeType() == ATTRIBUTE_NODE; } + + /** + * Return if this node has any children. + */ + bool HasChildren() const { return !!mFirstChild; } + + /** + * Get the number of children + * @return the number of children + */ + uint32_t GetChildCount() const { return mChildCount; } + + /** + * NOTE: this function is going to be removed soon (hopefully!) Don't use it + * in new code. + * + * Get a child by index + * @param aIndex the index of the child to get + * @return the child, or null if index out of bounds + */ + nsIContent* GetChildAt_Deprecated(uint32_t aIndex) const; + + /** + * Get the index of a child within this content. + * + * @param aPossibleChild the child to get the index of. + * @return the index of the child, or Nothing if not a child. Be aware that + * anonymous children (e.g. a <div> child of an <input> element) will + * result in Nothing. + * + * If the return value is Some, then calling GetChildAt_Deprecated() with + * that value will return aPossibleChild. + */ + mozilla::Maybe<uint32_t> ComputeIndexOf(const nsINode* aPossibleChild) const; + + /** + * Get the index of a child within this content's flat tree children. + * + * @param aPossibleChild the child to get the index of. + * @return the index of the child, or Nothing if not a child. Be aware that + * anonymous children (e.g. a <div> child of an <input> element) will + * result in Nothing. + */ + mozilla::Maybe<uint32_t> ComputeFlatTreeIndexOf( + const nsINode* aPossibleChild) const; + + /** + * Get the index of this within parent node (ComputeIndexInParentNode) or + * parent content (nsIContent) node (ComputeIndexInParentContent). + * + * @return the index of this node in the parent, or Nothing there is no + * parent (content) node or the parent does not have this node anymore + * (e.g., being removed from the parent). Be aware that anonymous + * children (e.g. a <div> child of an <input> element) will result in + * Nothing. + * + * If the return value is Some, then calling GetChildAt_Deprecated() with + * that value will return this. + */ + mozilla::Maybe<uint32_t> ComputeIndexInParentNode() const; + mozilla::Maybe<uint32_t> ComputeIndexInParentContent() const; + + /** + * Get the index of a child within this content. + * + * @param aPossibleChild the child to get the index of. + * @return the index of the child, or -1 if not a child. Be aware that + * anonymous children (e.g. a <div> child of an <input> element) will + * result in -1. + * + * If the return value is not -1, then calling GetChildAt_Deprecated() with + * that value will return aPossibleChild. + */ + int32_t ComputeIndexOf_Deprecated(const nsINode* aPossibleChild) const; + + /** + * Returns the "node document" of this node. + * + * https://dom.spec.whatwg.org/#concept-node-document + * + * Note that in the case that this node is a document node this method + * will return |this|. That is different to the Node.ownerDocument DOM + * attribute (implemented by nsINode::GetOwnerDocument) which is specified to + * be null in that case: + * + * https://dom.spec.whatwg.org/#dom-node-ownerdocument + * + * For all other cases OwnerDoc and GetOwnerDocument behave identically. + */ + Document* OwnerDoc() const MOZ_NONNULL_RETURN { + return mNodeInfo->GetDocument(); + } + + /** + * Return the "owner document" of this node as an nsINode*. Implemented + * in Document.h. + */ + inline nsINode* OwnerDocAsNode() const MOZ_NONNULL_RETURN; + + /** + * Returns true if the content has an ancestor that is a document. + * + * @return whether this content is in a document tree + */ + bool IsInUncomposedDoc() const { return GetBoolFlag(IsInDocument); } + + /** + * Get the document that this content is currently in, if any. This will be + * null if the content has no ancestor that is a document. + * + * @return the current document + */ + + Document* GetUncomposedDoc() const { + return IsInUncomposedDoc() ? OwnerDoc() : nullptr; + } + + /** + * Returns true if we're connected, and thus GetComposedDoc() would return a + * non-null value. + */ + bool IsInComposedDoc() const { return GetBoolFlag(IsConnected); } + + /** + * This method returns the owner document if the node is connected to it + * (as defined in the DOM spec), otherwise it returns null. + * In other words, returns non-null even in the case the node is in + * Shadow DOM, if there is a possibly shadow boundary crossing path from + * the node to its owner document. + */ + Document* GetComposedDoc() const { + return IsInComposedDoc() ? OwnerDoc() : nullptr; + } + + /** + * Returns OwnerDoc() if the node is in uncomposed document and ShadowRoot if + * the node is in Shadow DOM. + */ + mozilla::dom::DocumentOrShadowRoot* GetContainingDocumentOrShadowRoot() const; + + /** + * Returns OwnerDoc() if the node is in uncomposed document and ShadowRoot if + * the node is in Shadow DOM and is in composed document. + */ + mozilla::dom::DocumentOrShadowRoot* GetUncomposedDocOrConnectedShadowRoot() + const; + + /** + * To be called when reference count of the node drops to zero. + */ + void LastRelease(); + + /** + * The values returned by this function are the ones defined for + * Node.nodeType + */ + uint16_t NodeType() const { return mNodeInfo->NodeType(); } + const nsString& NodeName() const { return mNodeInfo->NodeName(); } + const nsString& LocalName() const { return mNodeInfo->LocalName(); } + + /** + * Get the NodeInfo for this element + * @return the nodes node info + */ + inline mozilla::dom::NodeInfo* NodeInfo() const { return mNodeInfo; } + + /** + * Called when we have been adopted, and the information of the + * node has been changed. + * + * The new document can be reached via OwnerDoc(). + * + * If you override this method, + * please call up to the parent NodeInfoChanged. + * + * If you change this, change also the similar method in Link. + */ + virtual void NodeInfoChanged(Document* aOldDoc) { +#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED + AssertInvariantsOnNodeInfoChange(); +#endif + } + + inline bool IsInNamespace(int32_t aNamespace) const { + return mNodeInfo->NamespaceID() == aNamespace; + } + + /** + * Returns the DocGroup of the "node document" of this node. + */ + DocGroup* GetDocGroup() const; + + /** + * Print a debugger friendly descriptor of this element. This will describe + * the position of this element in the document. + */ + friend std::ostream& operator<<(std::ostream& aStream, const nsINode& aNode); + + protected: + // These 2 methods are useful for the recursive templates IsHTMLElement, + // IsSVGElement, etc. + inline bool IsNodeInternal() const { return false; } + + template <typename First, typename... Args> + inline bool IsNodeInternal(First aFirst, Args... aArgs) const { + return mNodeInfo->Equals(aFirst) || IsNodeInternal(aArgs...); + } + + public: + inline bool IsHTMLElement() const { + return IsElement() && IsInNamespace(kNameSpaceID_XHTML); + } + + inline bool IsHTMLElement(const nsAtom* aTag) const { + return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_XHTML); + } + + template <typename First, typename... Args> + inline bool IsAnyOfHTMLElements(First aFirst, Args... aArgs) const { + return IsHTMLElement() && IsNodeInternal(aFirst, aArgs...); + } + + inline bool IsSVGElement() const { + return IsElement() && IsInNamespace(kNameSpaceID_SVG); + } + + inline bool IsSVGElement(const nsAtom* aTag) const { + return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_SVG); + } + + template <typename First, typename... Args> + inline bool IsAnyOfSVGElements(First aFirst, Args... aArgs) const { + return IsSVGElement() && IsNodeInternal(aFirst, aArgs...); + } + + virtual bool IsSVGAnimationElement() const { return false; } + virtual bool IsSVGComponentTransferFunctionElement() const { return false; } + virtual bool IsSVGFilterPrimitiveElement() const { return false; } + virtual bool IsSVGFilterPrimitiveChildElement() const { return false; } + virtual bool IsSVGGeometryElement() const { return false; } + virtual bool IsSVGGraphicsElement() const { return false; } + + inline bool IsXULElement() const { + return IsElement() && IsInNamespace(kNameSpaceID_XUL); + } + + inline bool IsXULElement(const nsAtom* aTag) const { + return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_XUL); + } + + template <typename First, typename... Args> + inline bool IsAnyOfXULElements(First aFirst, Args... aArgs) const { + return IsXULElement() && IsNodeInternal(aFirst, aArgs...); + } + + inline bool IsMathMLElement() const { + return IsElement() && IsInNamespace(kNameSpaceID_MathML); + } + + inline bool IsMathMLElement(const nsAtom* aTag) const { + return IsElement() && mNodeInfo->Equals(aTag, kNameSpaceID_MathML); + } + + template <typename First, typename... Args> + inline bool IsAnyOfMathMLElements(First aFirst, Args... aArgs) const { + return IsMathMLElement() && IsNodeInternal(aFirst, aArgs...); + } + + bool IsShadowRoot() const { + const bool isShadowRoot = IsInShadowTree() && !GetParentNode(); + MOZ_ASSERT_IF(isShadowRoot, IsDocumentFragment()); + return isShadowRoot; + } + + bool IsHTMLHeadingElement() const { + return IsAnyOfHTMLElements(nsGkAtoms::h1, nsGkAtoms::h2, nsGkAtoms::h3, + nsGkAtoms::h4, nsGkAtoms::h5, nsGkAtoms::h6); + } + + /** + * Check whether the conditional processing attributes other than + * systemLanguage "return true" if they apply to and are specified + * on the given SVG element. Returns true if this element should be + * rendered, false if it should not. + */ + virtual bool PassesConditionalProcessingTests() const { return true; } + + /** + * Insert a content node before another or at the end. + * This method handles calling BindToTree on the child appropriately. + * + * @param aKid the content to insert + * @param aBeforeThis an existing node. Use nullptr if you want to + * add aKid at the end. + * @param aNotify whether to notify the document (current document for + * nsIContent, and |this| for Document) that the insert has occurred + * @param aRv The error, if any. + * Throw NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have + * more than one element node as a child of a document. Doing this + * will also assert -- you shouldn't be doing it! Check with + * Document::GetRootElement() first if you're not sure. Apart from + * this one constraint, this doesn't do any checking on whether aKid is + * a valid child of |this|. + * Throw NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree). + */ + virtual void InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis, + bool aNotify, mozilla::ErrorResult& aRv); + + /** + * Append a content node to the end of the child list. This method handles + * calling BindToTree on the child appropriately. + * + * @param aKid the content to append + * @param aNotify whether to notify the document (current document for + * nsIContent, and |this| for Document) that the append has occurred + * @param aRv The error, if any. + * Throw NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have + * more than one element node as a child of a document. Doing this + * will also assert -- you shouldn't be doing it! Check with + * Document::GetRootElement() first if you're not sure. Apart from + * this one constraint, this doesn't do any checking on whether aKid is + * a valid child of |this|. + * Throw NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree). + */ + void AppendChildTo(nsIContent* aKid, bool aNotify, + mozilla::ErrorResult& aRv) { + InsertChildBefore(aKid, nullptr, aNotify, aRv); + } + + /** + * Remove a child from this node. This method handles calling UnbindFromTree + * on the child appropriately. + * + * @param aKid the content to remove + * @param aNotify whether to notify the document (current document for + * nsIContent, and |this| for Document) that the remove has occurred + */ + virtual void RemoveChildNode(nsIContent* aKid, bool aNotify); + + /** + * Get a property associated with this node. + * + * @param aPropertyName name of property to get. + * @param aStatus out parameter for storing resulting status. + * Set to NS_PROPTABLE_PROP_NOT_THERE if the property + * is not set. + * @return the property. Null if the property is not set + * (though a null return value does not imply the + * property was not set, i.e. it can be set to null). + */ + void* GetProperty(const nsAtom* aPropertyName, + nsresult* aStatus = nullptr) const; + + /** + * Set a property to be associated with this node. This will overwrite an + * existing value if one exists. The existing value is destroyed using the + * destructor function given when that value was set. + * + * @param aPropertyName name of property to set. + * @param aValue new value of property. + * @param aDtor destructor function to be used when this property + * is destroyed. + * @param aTransfer if true the property will not be deleted when the + * ownerDocument of the node changes, if false it + * will be deleted. + * + * @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property + * was already set + * @throws NS_ERROR_OUT_OF_MEMORY if that occurs + */ + nsresult SetProperty(nsAtom* aPropertyName, void* aValue, + NSPropertyDtorFunc aDtor = nullptr, + bool aTransfer = false); + + /** + * A generic destructor for property values allocated with new. + */ + template <class T> + static void DeleteProperty(void*, nsAtom*, void* aPropertyValue, void*) { + delete static_cast<T*>(aPropertyValue); + } + + /** + * Removes a property associated with this node. The value is destroyed using + * the destruction function given when that value was set. + * + * @param aPropertyName name of property to destroy. + */ + void RemoveProperty(const nsAtom* aPropertyName); + + /** + * Take a property associated with this node. The value will not be destroyed + * but rather returned. It is the caller's responsibility to destroy the value + * after that point. + * + * @param aPropertyName name of property to unset. + * @param aStatus out parameter for storing resulting status. + * Set to NS_PROPTABLE_PROP_NOT_THERE if the property + * is not set. + * @return the property. Null if the property is not set + * (though a null return value does not imply the + * property was not set, i.e. it can be set to null). + */ + void* TakeProperty(const nsAtom* aPropertyName, nsresult* aStatus = nullptr); + + bool HasProperties() const { return HasFlag(NODE_HAS_PROPERTIES); } + + /** + * Return the principal of this node. This is guaranteed to never be a null + * pointer. + */ + nsIPrincipal* NodePrincipal() const { + return mNodeInfo->NodeInfoManager()->DocumentPrincipal(); + } + + /** + * Return the CSP of this node's document, if any. + */ + nsIContentSecurityPolicy* GetCsp() const; + + /** + * Get the parent nsIContent for this node. + * @return the parent, or null if no parent or the parent is not an nsIContent + */ + nsIContent* GetParent() const { + return MOZ_LIKELY(GetBoolFlag(ParentIsContent)) ? mParent->AsContent() + : nullptr; + } + + /** + * Get the parent nsINode for this node. This can be either an nsIContent, a + * Document or an Attr. + * @return the parent node + */ + nsINode* GetParentNode() const { return mParent; } + + private: + nsIContent* DoGetShadowHost() const; + + public: + nsINode* GetParentOrShadowHostNode() const { + if (MOZ_LIKELY(mParent)) { + return mParent; + } + // We could put this in nsIContentInlines.h or such to avoid this + // reinterpret_cast, but it doesn't seem worth it. + return IsInShadowTree() ? reinterpret_cast<nsINode*>(DoGetShadowHost()) + : nullptr; + } + + enum FlattenedParentType { eNotForStyle, eForStyle }; + + /** + * Returns the node that is the parent of this node in the flattened + * tree. This differs from the normal parent if the node is filtered + * into an insertion point, or if the node is a direct child of a + * shadow root. + * + * @return the flattened tree parent + */ + inline nsINode* GetFlattenedTreeParentNode() const; + + nsINode* GetFlattenedTreeParentNodeNonInline() const; + + /** + * Like GetFlattenedTreeParentNode, but returns the document for any native + * anonymous content that was generated for ancestor frames of the document + * element's primary frame, such as scrollbar elements created by the root + * scroll frame. + */ + inline nsINode* GetFlattenedTreeParentNodeForStyle() const; + + inline mozilla::dom::Element* GetFlattenedTreeParentElement() const; + inline mozilla::dom::Element* GetFlattenedTreeParentElementForStyle() const; + + /** + * Get the parent nsINode for this node if it is an Element. + * + * Defined inline in Element.h + * + * @return the parent node + */ + inline mozilla::dom::Element* GetParentElement() const; + + /** + * Get the parent Element of this node, traversing over a ShadowRoot + * to its host if necessary. + */ + mozilla::dom::Element* GetParentElementCrossingShadowRoot() const; + + /** + * Get closest element node for the node. Meaning that if the node is an + * element node, returns itself. Otherwise, returns parent element or null. + */ + inline mozilla::dom::Element* GetAsElementOrParentElement() const; + + /** + * Get the root of the subtree this node belongs to. This never returns + * null. It may return 'this' (e.g. for document nodes, and nodes that + * are the roots of disconnected subtrees). + */ + nsINode* SubtreeRoot() const; + + /* + * Get context object's shadow-including root if options's composed is true, + * and context object's root otherwise. + */ + nsINode* GetRootNode(const mozilla::dom::GetRootNodeOptions& aOptions); + + virtual mozilla::EventListenerManager* GetExistingListenerManager() + const override; + virtual mozilla::EventListenerManager* GetOrCreateListenerManager() override; + + mozilla::Maybe<mozilla::dom::EventCallbackDebuggerNotificationType> + GetDebuggerNotificationType() const override; + + bool ComputeDefaultWantsUntrusted(mozilla::ErrorResult& aRv) final; + + virtual bool IsApzAware() const override; + + virtual nsPIDOMWindowOuter* GetOwnerGlobalForBindingsInternal() override; + virtual nsIGlobalObject* GetOwnerGlobal() const override; + + using mozilla::dom::EventTarget::DispatchEvent; + // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + MOZ_CAN_RUN_SCRIPT_BOUNDARY bool DispatchEvent( + mozilla::dom::Event& aEvent, mozilla::dom::CallerType aCallerType, + mozilla::ErrorResult& aRv) override; + + MOZ_CAN_RUN_SCRIPT + nsresult PostHandleEvent(mozilla::EventChainPostVisitor& aVisitor) override; + + /** + * Adds a mutation observer to be notified when this node, or any of its + * descendants, are modified. The node will hold a weak reference to the + * observer, which means that it is the responsibility of the observer to + * remove itself in case it dies before the node. If an observer is added + * while observers are being notified, it may also be notified. In general, + * adding observers while inside a notification is not a good idea. An + * observer that is already observing the node must not be added without + * being removed first. + * + * For mutation observers that implement nsIAnimationObserver, use + * AddAnimationObserver instead. + */ + void AddMutationObserver(nsIMutationObserver* aMutationObserver) { + nsSlots* s = Slots(); + if (aMutationObserver) { + NS_ASSERTION(!s->mMutationObservers.contains(aMutationObserver), + "Observer already in the list"); + + s->mMutationObservers.pushBack(aMutationObserver); + } + } + + void AddMutationObserver(nsMultiMutationObserver* aMultiMutationObserver); + + /** + * Same as above, but only adds the observer if its not observing + * the node already. + * + * For mutation observers that implement nsIAnimationObserver, use + * AddAnimationObserverUnlessExists instead. + */ + void AddMutationObserverUnlessExists(nsIMutationObserver* aMutationObserver) { + nsSlots* s = Slots(); + if (aMutationObserver && + !s->mMutationObservers.contains(aMutationObserver)) { + s->mMutationObservers.pushBack(aMutationObserver); + } + } + + void AddMutationObserverUnlessExists( + nsMultiMutationObserver* aMultiMutationObserver); + /** + * Same as AddMutationObserver, but for nsIAnimationObservers. This + * additionally records on the document that animation observers have + * been registered, which is used to determine whether notifications + * must be fired when animations are added, removed or changed. + */ + void AddAnimationObserver(nsIAnimationObserver* aAnimationObserver); + + /** + * Same as above, but only adds the observer if its not observing + * the node already. + */ + void AddAnimationObserverUnlessExists( + nsIAnimationObserver* aAnimationObserver); + + /** + * Removes a mutation observer. + */ + void RemoveMutationObserver(nsIMutationObserver* aMutationObserver) { + nsSlots* s = GetExistingSlots(); + if (s) { + s->mMutationObservers.remove(aMutationObserver); + } + } + + void RemoveMutationObserver(nsMultiMutationObserver* aMultiMutationObserver); + + mozilla::SafeDoublyLinkedList<nsIMutationObserver>* GetMutationObservers(); + + /** + * Helper methods to access ancestor node(s) of type T. + * The implementations of the methods are in mozilla/dom/AncestorIterator.h. + */ + template <typename T> + inline mozilla::dom::AncestorsOfTypeIterator<T> AncestorsOfType() const; + + template <typename T> + inline mozilla::dom::InclusiveAncestorsOfTypeIterator<T> + InclusiveAncestorsOfType() const; + + template <typename T> + inline mozilla::dom::FlatTreeAncestorsOfTypeIterator<T> + FlatTreeAncestorsOfType() const; + + template <typename T> + inline mozilla::dom::InclusiveFlatTreeAncestorsOfTypeIterator<T> + InclusiveFlatTreeAncestorsOfType() const; + + template <typename T> + T* FirstAncestorOfType() const; + + private: + /** + * Walks aNode, its attributes and, if aDeep is true, its descendant nodes. + * If aClone is true the nodes will be cloned. If aNewNodeInfoManager is + * not null, it is used to create new nodeinfos for the nodes. Also reparents + * the XPConnect wrappers for the nodes into aReparentScope if non-null. + * + * @param aNode Node to adopt/clone. + * @param aClone If true the node will be cloned and the cloned node will + * be returned. + * @param aDeep If true the function will be called recursively on + * descendants of the node + * @param aNewNodeInfoManager The nodeinfo manager to use to create new + * nodeinfos for aNode and its attributes and + * descendants. May be null if the nodeinfos + * shouldn't be changed. + * @param aReparentScope Scope into which wrappers should be reparented, or + * null if no reparenting should be done. + * @param aParent If aClone is true the cloned node will be appended to + * aParent's children. May be null. If not null then aNode + * must be an nsIContent. + * @param aError The error, if any. + * + * @return If aClone is true then the cloned node will be returned, + * unless an error occurred. In error conditions, null + * will be returned. + */ + static already_AddRefed<nsINode> CloneAndAdopt( + nsINode* aNode, bool aClone, bool aDeep, + nsNodeInfoManager* aNewNodeInfoManager, + JS::Handle<JSObject*> aReparentScope, nsINode* aParent, + mozilla::ErrorResult& aError); + + public: + /** + * Walks the node, its attributes and descendant nodes. If aNewNodeInfoManager + * is not null, it is used to create new nodeinfos for the nodes. Also + * reparents the XPConnect wrappers for the nodes into aReparentScope if + * non-null. + * + * @param aNewNodeInfoManager The nodeinfo manager to use to create new + * nodeinfos for the node and its attributes and + * descendants. May be null if the nodeinfos + * shouldn't be changed. + * @param aReparentScope New scope for the wrappers, or null if no reparenting + * should be done. + * @param aError The error, if any. + */ + void Adopt(nsNodeInfoManager* aNewNodeInfoManager, + JS::Handle<JSObject*> aReparentScope, + mozilla::ErrorResult& aError); + + /** + * Clones the node, its attributes and, if aDeep is true, its descendant nodes + * If aNewNodeInfoManager is not null, it is used to create new nodeinfos for + * the clones. + * + * @param aDeep If true the function will be called recursively on + * descendants of the node + * @param aNewNodeInfoManager The nodeinfo manager to use to create new + * nodeinfos for the node and its attributes and + * descendants. May be null if the nodeinfos + * shouldn't be changed. + * @param aError The error, if any. + * + * @return The newly created node. Null in error conditions. + */ + already_AddRefed<nsINode> Clone(bool aDeep, + nsNodeInfoManager* aNewNodeInfoManager, + mozilla::ErrorResult& aError); + + /** + * Clones this node. This needs to be overriden by all node classes. aNodeInfo + * should be identical to this node's nodeInfo, except for the document which + * may be different. When cloning an element, all attributes of the element + * will be cloned. The children of the node will not be cloned. + * + * @param aNodeInfo the nodeinfo to use for the clone + * @param aResult the clone + */ + virtual nsresult Clone(mozilla::dom::NodeInfo*, nsINode** aResult) const = 0; + + // This class can be extended by subclasses that wish to store more + // information in the slots. + class nsSlots { + public: + nsSlots(); + + // If needed we could remove the vtable pointer this dtor causes by + // putting a DestroySlots function on nsINode + virtual ~nsSlots(); + + virtual void Traverse(nsCycleCollectionTraversalCallback&); + virtual void Unlink(nsINode&); + + /** + * A list of mutation observers + */ + mozilla::SafeDoublyLinkedList<nsIMutationObserver> mMutationObservers; + + /** + * An object implementing NodeList for this content (childNodes) + * @see NodeList + * @see nsGenericHTMLElement::GetChildNodes + */ + RefPtr<nsAttrChildContentList> mChildNodes; + + /** + * Weak reference to this node. This is cleared by the destructor of + * nsNodeWeakReference. + */ + nsNodeWeakReference* MOZ_NON_OWNING_REF mWeakReference; + + /** + * A set of ranges which are in the selection and which have this node as + * their endpoints' closest common inclusive ancestor + * (https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor). This is + * a UniquePtr instead of just a LinkedList, because that prevents us from + * pushing DOMSlots up to the next allocation bucket size, at the cost of + * some complexity. + */ + mozilla::UniquePtr<mozilla::LinkedList<mozilla::dom::AbstractRange>> + mClosestCommonInclusiveAncestorRanges; + }; + + /** + * Functions for managing flags and slots + */ +#ifdef DEBUG + nsSlots* DebugGetSlots() { return Slots(); } +#endif + + void SetFlags(FlagsType aFlagsToSet) { + NS_ASSERTION( + !(aFlagsToSet & + (NODE_IS_NATIVE_ANONYMOUS_ROOT | NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE | + NODE_DESCENDANTS_NEED_FRAMES | NODE_NEEDS_FRAME | + NODE_HAS_BEEN_IN_UA_WIDGET)) || + IsContent(), + "Flag only permitted on nsIContent nodes"); + nsWrapperCache::SetFlags(aFlagsToSet); + } + + void UnsetFlags(FlagsType aFlagsToUnset) { + NS_ASSERTION(!(aFlagsToUnset & (NODE_HAS_BEEN_IN_UA_WIDGET | + NODE_IS_NATIVE_ANONYMOUS_ROOT)), + "Trying to unset write-only flags"); + nsWrapperCache::UnsetFlags(aFlagsToUnset); + } + + void SetEditableFlag(bool aEditable) { + if (aEditable) { + SetFlags(NODE_IS_EDITABLE); + } else { + UnsetFlags(NODE_IS_EDITABLE); + } + } + + inline bool IsEditable() const; + + /** + * Check if this node is an editing host. For avoiding confusion, this always + * returns false if the node is in the design mode document. + */ + inline bool IsEditingHost() const; + + /** + * Check if this node is in design mode or not. When this returns true and: + * - if this is a Document node, it's the design mode root. + * - if this is a content node, it's connected, it's not in a shadow tree + * (except shadow tree for UI widget and native anonymous subtree) and its + * uncomposed document is in design mode. + * Note that returning true does NOT mean the node or its children is + * editable. E.g., when this node is in a shadow tree of a UA widget and its + * host is in design mode. + */ + inline bool IsInDesignMode() const; + + /** + * Returns true if |this| or any of its ancestors is native anonymous. + */ + bool IsInNativeAnonymousSubtree() const { + return HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE); + } + + /** + * If |this| or any ancestor is native anonymous, return the root of the + * native anonymous subtree. Note that in case of nested native anonymous + * content, this returns the innermost root, not the outermost. + */ + nsIContent* GetClosestNativeAnonymousSubtreeRoot() const { + if (!IsInNativeAnonymousSubtree()) { + MOZ_ASSERT(!HasBeenInUAWidget(), "UA widget implies anonymous"); + return nullptr; + } + MOZ_ASSERT(IsContent(), "How did non-content end up in NAC?"); + if (HasBeenInUAWidget()) { + // reinterpret_cast because in this header we don't know ShadowRoot is an + // nsIContent. ShadowRoot constructor asserts this is correct. + return reinterpret_cast<nsIContent*>(GetContainingShadow()); + } + for (const nsINode* node = this; node; node = node->GetParentNode()) { + if (node->IsRootOfNativeAnonymousSubtree()) { + return const_cast<nsINode*>(node)->AsContent(); + } + } + // FIXME(emilio): This should not happen, usually, but editor removes nodes + // in native anonymous subtrees, and we don't clean nodes from the current + // event content stack from ContentRemoved, so it can actually happen, see + // bug 1510208. + NS_WARNING("GetClosestNativeAnonymousSubtreeRoot on disconnected NAC!"); + return nullptr; + } + + /** + * If |this| or any ancestor is native anonymous, return the parent of the + * native anonymous subtree. Note that in case of nested native anonymous + * content, this returns the parent or host of the innermost root, not the + * outermost. + */ + nsIContent* GetClosestNativeAnonymousSubtreeRootParentOrHost() const { + // We could put this in nsIContentInlines.h or such to avoid this + // reinterpret_cast, but it doesn't seem worth it. + const auto* root = reinterpret_cast<const nsINode*>( + GetClosestNativeAnonymousSubtreeRoot()); + if (!root) { + return nullptr; + } + if (nsIContent* parent = root->GetParent()) { + return parent; + } + if (MOZ_UNLIKELY(root->IsInShadowTree())) { + return root->DoGetShadowHost(); + } + return nullptr; + } + + /** + * Gets the root of the node tree for this content if it is in a shadow tree. + */ + mozilla::dom::ShadowRoot* GetContainingShadow() const; + /** + * Gets the shadow host if this content is in a shadow tree. That is, the host + * of |GetContainingShadow|, if its not null. + * + * @return The shadow host, if this is in shadow tree, or null. + */ + mozilla::dom::Element* GetContainingShadowHost() const; + + bool IsInSVGUseShadowTree() const { + return !!GetContainingSVGUseShadowHost(); + } + + mozilla::dom::SVGUseElement* GetContainingSVGUseShadowHost() const { + if (!IsInShadowTree()) { + return nullptr; + } + return DoGetContainingSVGUseShadowHost(); + } + + // Whether this node has ever been part of a UA widget shadow tree. + bool HasBeenInUAWidget() const { return HasFlag(NODE_HAS_BEEN_IN_UA_WIDGET); } + + // True for native anonymous content and for content in UA widgets. + // Only nsIContent can fulfill this condition. + bool ChromeOnlyAccess() const { return IsInNativeAnonymousSubtree(); } + + const nsIContent* GetChromeOnlyAccessSubtreeRootParent() const { + return GetClosestNativeAnonymousSubtreeRootParentOrHost(); + } + + bool IsInShadowTree() const { return HasFlag(NODE_IS_IN_SHADOW_TREE); } + + /** + * Get whether this node is C++-generated anonymous content + * @see nsIAnonymousContentCreator + * @return whether this content is anonymous + */ + bool IsRootOfNativeAnonymousSubtree() const { + NS_ASSERTION( + !HasFlag(NODE_IS_NATIVE_ANONYMOUS_ROOT) || IsInNativeAnonymousSubtree(), + "Some flags seem to be missing!"); + return HasFlag(NODE_IS_NATIVE_ANONYMOUS_ROOT); + } + + // Whether this node is the root of a ChromeOnlyAccess DOM subtree. + bool IsRootOfChromeAccessOnlySubtree() const { + return IsRootOfNativeAnonymousSubtree(); + } + + /** Whether this is the container of a ::before pseudo-element. */ + bool IsGeneratedContentContainerForBefore() const { + return IsRootOfNativeAnonymousSubtree() && + mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore; + } + + /** Whether this is the container of an ::after pseudo-element. */ + bool IsGeneratedContentContainerForAfter() const { + return IsRootOfNativeAnonymousSubtree() && + mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentafter; + } + + /** Whether this is the container of a ::marker pseudo-element. */ + bool IsGeneratedContentContainerForMarker() const { + return IsRootOfNativeAnonymousSubtree() && + mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentmarker; + } + + /** + * Returns true if |this| node is the closest common inclusive ancestor + * (https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor) of the + * start/end nodes of a Range in a Selection or a descendant of such a common + * ancestor. This node is definitely not selected when |false| is returned, + * but it may or may not be selected when |true| is returned. + */ + bool IsMaybeSelected() const { + return IsDescendantOfClosestCommonInclusiveAncestorForRangeInSelection() || + IsClosestCommonInclusiveAncestorForRangeInSelection(); + } + + /** + * Return true if any part of (this, aStartOffset) .. (this, aEndOffset) + * overlaps any nsRange in + * GetClosestCommonInclusiveAncestorForRangeInSelection ranges (i.e. + * where this is a descendant of a range's common inclusive ancestor node). + * If a nsRange starts in (this, aEndOffset) or if it ends in + * (this, aStartOffset) then it is non-overlapping and the result is false + * for that nsRange. Collapsed ranges always counts as non-overlapping. + * + * @param aStartOffset has to be less or equal to aEndOffset. + */ + bool IsSelected(uint32_t aStartOffset, uint32_t aEndOffset) const; + + /** + * Get the root element of the text editor associated with this node or the + * root element of the text editor of the ancestor 'TextControlElement' if + * this is in its native anonymous subtree. I.e., this returns anonymous + * `<div>` element of a `TextEditor`. Note that this can be used only for + * getting root content of `<input>` or `<textarea>`. I.e., this method + * doesn't support HTML editors. Note that this may create a `TextEditor` + * instance, and it means that the `TextEditor` may modify its native + * anonymous subtree and may run selection listeners. + */ + MOZ_CAN_RUN_SCRIPT mozilla::dom::Element* GetAnonymousRootElementOfTextEditor( + mozilla::TextEditor** aTextEditor = nullptr); + + /** + * Get the nearest selection root, ie. the node that will be selected if the + * user does "Select All" while the focus is in this node. Note that if this + * node is not in an editor, the result comes from the nsFrameSelection that + * is related to aPresShell, so the result might not be the ancestor of this + * node. Be aware that if this node and the computed selection limiter are + * not in same subtree, this returns the root content of the closeset subtree. + */ + MOZ_CAN_RUN_SCRIPT nsIContent* GetSelectionRootContent( + mozilla::PresShell* aPresShell); + + nsINodeList* ChildNodes(); + + nsIContent* GetFirstChild() const { return mFirstChild; } + + nsIContent* GetLastChild() const; + + /** + * Implementation is in Document.h, because it needs to cast from + * Document* to nsINode*. + */ + Document* GetOwnerDocument() const; + + // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + MOZ_CAN_RUN_SCRIPT_BOUNDARY void Normalize(); + + /** + * Get the base URI for any relative URIs within this piece of + * content. Generally, this is the document's base URI, but certain + * content carries a local base for backward compatibility. + * + * @return the base URI. May return null. + */ + virtual nsIURI* GetBaseURI(bool aTryUseXHRDocBaseURI = false) const = 0; + nsIURI* GetBaseURIObject() const; + + /** + * Return true if the node may be apz aware. There are two cases. One is that + * the node is apz aware (such as HTMLInputElement with number type). The + * other is that the node has apz aware listeners. This is a non-virtual + * function which calls IsNodeApzAwareInternal only when the MayBeApzAware is + * set. We check the details in IsNodeApzAwareInternal which may be overriden + * by child classes + */ + bool IsNodeApzAware() const { + return NodeMayBeApzAware() ? IsNodeApzAwareInternal() : false; + } + + /** + * Override this function and set the flag MayBeApzAware in case the node has + * to let APZC be aware of it. It's used when the node may handle the apz + * aware events and may do preventDefault to stop APZC to do default actions. + * + * For example, instead of scrolling page by APZ, we handle mouse wheel event + * in HTMLInputElement with number type as increasing / decreasing its value. + */ + virtual bool IsNodeApzAwareInternal() const; + + void GetTextContent(nsAString& aTextContent, mozilla::OOMReporter& aError) { + GetTextContentInternal(aTextContent, aError); + } + void SetTextContent(const nsAString& aTextContent, + nsIPrincipal* aSubjectPrincipal, + mozilla::ErrorResult& aError) { + SetTextContentInternal(aTextContent, aSubjectPrincipal, aError); + } + void SetTextContent(const nsAString& aTextContent, + mozilla::ErrorResult& aError) { + SetTextContentInternal(aTextContent, nullptr, aError); + } + + mozilla::dom::Element* QuerySelector(const nsACString& aSelector, + mozilla::ErrorResult& aResult); + already_AddRefed<nsINodeList> QuerySelectorAll(const nsACString& aSelector, + mozilla::ErrorResult& aResult); + + protected: + // Document and ShadowRoot override this with its own (faster) version. + // This should really only be called for elements and document fragments. + mozilla::dom::Element* GetElementById(const nsAString& aId); + + void AppendChildToChildList(nsIContent* aKid); + void InsertChildToChildList(nsIContent* aKid, nsIContent* aNextSibling); + void DisconnectChild(nsIContent* aKid); + + public: + void LookupPrefix(const nsAString& aNamespace, nsAString& aResult); + bool IsDefaultNamespace(const nsAString& aNamespaceURI) { + nsAutoString defaultNamespace; + LookupNamespaceURI(u""_ns, defaultNamespace); + return aNamespaceURI.Equals(defaultNamespace); + } + void LookupNamespaceURI(const nsAString& aNamespacePrefix, + nsAString& aNamespaceURI); + + nsIContent* GetNextSibling() const { return mNextSibling; } + nsIContent* GetPreviousSibling() const; + + /** + * Return true if the node is being removed from the parent, it means that + * the node still knows the container which it's disconnected from, but the + * node has already been removed from the child node chain of the container. + * I.e., Return true between a call of DisconnectChild of the parent and + * a call of UnbindFromTree of the node. + */ + bool IsBeingRemoved() const { + return mParent && !mNextSibling && !mPreviousOrLastSibling; + } + + /** + * Get the next node in the pre-order tree traversal of the DOM. If + * aRoot is non-null, then it must be an ancestor of |this| + * (possibly equal to |this|) and only nodes that are descendants of + * aRoot, not including aRoot itself, will be returned. Returns + * null if there are no more nodes to traverse. + */ + nsIContent* GetNextNode(const nsINode* aRoot = nullptr) const { + return GetNextNodeImpl(aRoot, false); + } + + /** + * Get the next node in the pre-order tree traversal of the DOM but ignoring + * the children of this node. If aRoot is non-null, then it must be an + * ancestor of |this| (possibly equal to |this|) and only nodes that are + * descendants of aRoot, not including aRoot itself, will be returned. + * Returns null if there are no more nodes to traverse. + */ + nsIContent* GetNextNonChildNode(const nsINode* aRoot = nullptr) const { + return GetNextNodeImpl(aRoot, true); + } + + /** + * Returns true if 'this' is either document or element or + * document fragment and aOther is a descendant in the same + * anonymous tree. + */ + bool Contains(const nsINode* aOther) const; + + bool UnoptimizableCCNode() const; + + /** + * Fire a DOMNodeRemoved mutation event for all children of this node + * TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY void FireNodeRemovedForChildren(); + + void QueueDevtoolsAnonymousEvent(bool aIsRemove); + + private: + mozilla::dom::SVGUseElement* DoGetContainingSVGUseShadowHost() const; + + nsIContent* GetNextNodeImpl(const nsINode* aRoot, + const bool aSkipChildren) const { +#ifdef DEBUG + if (aRoot) { + // TODO: perhaps nsINode::IsInclusiveDescendantOf could be used instead. + const nsINode* cur = this; + for (; cur; cur = cur->GetParentNode()) + if (cur == aRoot) break; + NS_ASSERTION(cur, "aRoot not an ancestor of |this|?"); + } +#endif + if (!aSkipChildren) { + nsIContent* kid = GetFirstChild(); + if (kid) { + return kid; + } + } + if (this == aRoot) { + return nullptr; + } + const nsINode* cur = this; + while (1) { + nsIContent* next = cur->GetNextSibling(); + if (next) { + return next; + } + nsINode* parent = cur->GetParentNode(); + if (parent == aRoot) { + return nullptr; + } + cur = parent; + } + MOZ_ASSERT_UNREACHABLE("How did we get here?"); + } + + public: + /** + * Get the previous nsIContent in the pre-order tree traversal of the DOM. If + * aRoot is non-null, then it must be an ancestor of |this| + * (possibly equal to |this|) and only nsIContents that are descendants of + * aRoot, including aRoot itself, will be returned. Returns + * null if there are no more nsIContents to traverse. + */ + nsIContent* GetPrevNode(const nsINode* aRoot = nullptr) const { +#ifdef DEBUG + if (aRoot) { + // TODO: perhaps nsINode::IsInclusiveDescendantOf could be used instead. + const nsINode* cur = this; + for (; cur; cur = cur->GetParentNode()) + if (cur == aRoot) break; + NS_ASSERTION(cur, "aRoot not an ancestor of |this|?"); + } +#endif + + if (this == aRoot) { + return nullptr; + } + nsIContent* cur = this->GetParent(); + nsIContent* iter = this->GetPreviousSibling(); + while (iter) { + cur = iter; + iter = reinterpret_cast<nsINode*>(iter)->GetLastChild(); + } + return cur; + } + + /** + * Boolean flags + */ + private: + enum BooleanFlag { + // Set if we're being used from -moz-element + NodeHasRenderingObservers, + // Set if our parent chain (including this node itself) terminates + // in a document + IsInDocument, + // Set if we're part of the composed doc. + // https://dom.spec.whatwg.org/#connected + IsConnected, + // Set if mParent is an nsIContent + ParentIsContent, + // Set if this node is an Element + NodeIsElement, + // Set if the element has a non-empty id attribute. This can in rare + // cases lie for nsXMLElement, such as when the node has been moved between + // documents with different id mappings. + ElementHasID, + // Set if the element might have a class. + ElementMayHaveClass, + // Set if the element might have inline style. + ElementMayHaveStyle, + // Set if the element has a name attribute set. + ElementHasName, + // Set if the element has a part attribute set. + ElementHasPart, + // Set if the element might have a contenteditable attribute set. + ElementMayHaveContentEditableAttr, + // Set if the node is the closest common inclusive ancestor of the start/end + // nodes of a Range that is in a Selection. + NodeIsClosestCommonInclusiveAncestorForRangeInSelection, + // Set if the node is a descendant of a node with the above bit set. + NodeIsDescendantOfClosestCommonInclusiveAncestorForRangeInSelection, + // Set if CanSkipInCC check has been done for this subtree root. + NodeIsCCMarkedRoot, + // Maybe set if this node is in black subtree. + NodeIsCCBlackTree, + // Maybe set if the node is a root of a subtree + // which needs to be kept in the purple buffer. + NodeIsPurpleRoot, + // Set if the element has some style states locked + ElementHasLockedStyleStates, + // Set if element has pointer locked + ElementHasPointerLock, + // Set if the node may have DOMMutationObserver attached to it. + NodeMayHaveDOMMutationObserver, + // Set if node is Content + NodeIsContent, + // Set if the node has animations or transitions + ElementHasAnimations, + // Set if node has a dir attribute with a valid value (ltr, rtl, or auto). + // Note that we cannot compute this from the dir attribute event state + // flags, because we can't use those to distinguish + // <bdi dir="some-invalid-value"> and <bdi dir="auto">. + NodeHasValidDirAttribute, + // Set if the node has dir=auto and has a property pointing to the text + // node that determines its direction + NodeHasDirAutoSet, + // Set if the node is a text node descendant of a node with dir=auto + // and has a TextNodeDirectionalityMap property listing the elements whose + // direction it determines. + NodeHasTextNodeDirectionalityMap, + // Set if a node in the node's parent chain has dir=auto. + NodeAncestorHasDirAuto, + // Set if the node is handling a click. + NodeHandlingClick, + // Set if the element has a parser insertion mode other than "in body", + // per the HTML5 "Parse state" section. + ElementHasWeirdParserInsertionMode, + // Parser sets this flag if it has notified about the node. + ParserHasNotified, + // Sets if the node is apz aware or we have apz aware listeners. + MayBeApzAware, + // Set if the element might have any kind of anonymous content children, + // which would not be found through the element's children list. + ElementMayHaveAnonymousChildren, + // Set if element has CustomElementData. + ElementHasCustomElementData, + // Set if the element was created from prototype cache and + // its l10n attributes haven't been changed. + ElementCreatedFromPrototypeAndHasUnmodifiedL10n, + // Guard value + BooleanFlagCount + }; + + void SetBoolFlag(BooleanFlag name, bool value) { + static_assert(BooleanFlagCount <= 8 * sizeof(mBoolFlags), + "Too many boolean flags"); + mBoolFlags = (mBoolFlags & ~(1 << name)) | (value << name); + } + + void SetBoolFlag(BooleanFlag name) { + static_assert(BooleanFlagCount <= 8 * sizeof(mBoolFlags), + "Too many boolean flags"); + mBoolFlags |= (1 << name); + } + + void ClearBoolFlag(BooleanFlag name) { + static_assert(BooleanFlagCount <= 8 * sizeof(mBoolFlags), + "Too many boolean flags"); + mBoolFlags &= ~(1 << name); + } + + bool GetBoolFlag(BooleanFlag name) const { + static_assert(BooleanFlagCount <= 8 * sizeof(mBoolFlags), + "Too many boolean flags"); + return mBoolFlags & (1 << name); + } + + public: + bool HasRenderingObservers() const { + return GetBoolFlag(NodeHasRenderingObservers); + } + void SetHasRenderingObservers(bool aValue) { + SetBoolFlag(NodeHasRenderingObservers, aValue); + } + bool IsContent() const { return GetBoolFlag(NodeIsContent); } + bool HasID() const { return GetBoolFlag(ElementHasID); } + bool MayHaveClass() const { return GetBoolFlag(ElementMayHaveClass); } + void SetMayHaveClass() { SetBoolFlag(ElementMayHaveClass); } + bool MayHaveStyle() const { return GetBoolFlag(ElementMayHaveStyle); } + bool HasName() const { return GetBoolFlag(ElementHasName); } + bool HasPartAttribute() const { return GetBoolFlag(ElementHasPart); } + bool MayHaveContentEditableAttr() const { + return GetBoolFlag(ElementMayHaveContentEditableAttr); + } + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor + */ + bool IsClosestCommonInclusiveAncestorForRangeInSelection() const { + return GetBoolFlag(NodeIsClosestCommonInclusiveAncestorForRangeInSelection); + } + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor + */ + void SetClosestCommonInclusiveAncestorForRangeInSelection() { + SetBoolFlag(NodeIsClosestCommonInclusiveAncestorForRangeInSelection); + } + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor + */ + void ClearClosestCommonInclusiveAncestorForRangeInSelection() { + ClearBoolFlag(NodeIsClosestCommonInclusiveAncestorForRangeInSelection); + } + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor + */ + bool IsDescendantOfClosestCommonInclusiveAncestorForRangeInSelection() const { + return GetBoolFlag( + NodeIsDescendantOfClosestCommonInclusiveAncestorForRangeInSelection); + } + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor + */ + void SetDescendantOfClosestCommonInclusiveAncestorForRangeInSelection() { + SetBoolFlag( + NodeIsDescendantOfClosestCommonInclusiveAncestorForRangeInSelection); + } + /** + * https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor + */ + void ClearDescendantOfClosestCommonInclusiveAncestorForRangeInSelection() { + ClearBoolFlag( + NodeIsDescendantOfClosestCommonInclusiveAncestorForRangeInSelection); + } + + void SetCCMarkedRoot(bool aValue) { SetBoolFlag(NodeIsCCMarkedRoot, aValue); } + bool CCMarkedRoot() const { return GetBoolFlag(NodeIsCCMarkedRoot); } + void SetInCCBlackTree(bool aValue) { SetBoolFlag(NodeIsCCBlackTree, aValue); } + bool InCCBlackTree() const { return GetBoolFlag(NodeIsCCBlackTree); } + void SetIsPurpleRoot(bool aValue) { SetBoolFlag(NodeIsPurpleRoot, aValue); } + bool IsPurpleRoot() const { return GetBoolFlag(NodeIsPurpleRoot); } + bool MayHaveDOMMutationObserver() { + return GetBoolFlag(NodeMayHaveDOMMutationObserver); + } + void SetMayHaveDOMMutationObserver() { + SetBoolFlag(NodeMayHaveDOMMutationObserver, true); + } + bool HasListenerManager() { return HasFlag(NODE_HAS_LISTENERMANAGER); } + bool HasPointerLock() const { return GetBoolFlag(ElementHasPointerLock); } + void SetPointerLock() { SetBoolFlag(ElementHasPointerLock); } + void ClearPointerLock() { ClearBoolFlag(ElementHasPointerLock); } + bool MayHaveAnimations() const { return GetBoolFlag(ElementHasAnimations); } + void SetMayHaveAnimations() { SetBoolFlag(ElementHasAnimations); } + void ClearMayHaveAnimations() { ClearBoolFlag(ElementHasAnimations); } + void SetHasValidDir() { SetBoolFlag(NodeHasValidDirAttribute); } + void ClearHasValidDir() { ClearBoolFlag(NodeHasValidDirAttribute); } + bool HasValidDir() const { return GetBoolFlag(NodeHasValidDirAttribute); } + void SetHasDirAutoSet() { + MOZ_ASSERT(NodeType() != TEXT_NODE, "SetHasDirAutoSet on text node"); + SetBoolFlag(NodeHasDirAutoSet); + } + void ClearHasDirAutoSet() { + MOZ_ASSERT(NodeType() != TEXT_NODE, "ClearHasDirAutoSet on text node"); + ClearBoolFlag(NodeHasDirAutoSet); + } + bool HasDirAutoSet() const { return GetBoolFlag(NodeHasDirAutoSet); } + void SetHasTextNodeDirectionalityMap() { + MOZ_ASSERT(NodeType() == TEXT_NODE, + "SetHasTextNodeDirectionalityMap on non-text node"); + SetBoolFlag(NodeHasTextNodeDirectionalityMap); + } + void ClearHasTextNodeDirectionalityMap() { + MOZ_ASSERT(NodeType() == TEXT_NODE, + "ClearHasTextNodeDirectionalityMap on non-text node"); + ClearBoolFlag(NodeHasTextNodeDirectionalityMap); + } + bool HasTextNodeDirectionalityMap() const { + MOZ_ASSERT(NodeType() == TEXT_NODE, + "HasTextNodeDirectionalityMap on non-text node"); + return GetBoolFlag(NodeHasTextNodeDirectionalityMap); + } + + void SetAncestorHasDirAuto() { SetBoolFlag(NodeAncestorHasDirAuto); } + void ClearAncestorHasDirAuto() { ClearBoolFlag(NodeAncestorHasDirAuto); } + bool AncestorHasDirAuto() const { + return GetBoolFlag(NodeAncestorHasDirAuto); + } + + // Implemented in nsIContentInlines.h. + inline bool NodeOrAncestorHasDirAuto() const; + + void SetParserHasNotified() { SetBoolFlag(ParserHasNotified); }; + bool HasParserNotified() { return GetBoolFlag(ParserHasNotified); } + + void SetMayBeApzAware() { SetBoolFlag(MayBeApzAware); } + bool NodeMayBeApzAware() const { return GetBoolFlag(MayBeApzAware); } + + void SetMayHaveAnonymousChildren() { + SetBoolFlag(ElementMayHaveAnonymousChildren); + } + bool MayHaveAnonymousChildren() const { + return GetBoolFlag(ElementMayHaveAnonymousChildren); + } + + void SetHasCustomElementData() { SetBoolFlag(ElementHasCustomElementData); } + bool HasCustomElementData() const { + return GetBoolFlag(ElementHasCustomElementData); + } + + void SetElementCreatedFromPrototypeAndHasUnmodifiedL10n() { + SetBoolFlag(ElementCreatedFromPrototypeAndHasUnmodifiedL10n); + } + bool HasElementCreatedFromPrototypeAndHasUnmodifiedL10n() { + return GetBoolFlag(ElementCreatedFromPrototypeAndHasUnmodifiedL10n); + } + void ClearElementCreatedFromPrototypeAndHasUnmodifiedL10n() { + ClearBoolFlag(ElementCreatedFromPrototypeAndHasUnmodifiedL10n); + } + + protected: + void SetParentIsContent(bool aValue) { SetBoolFlag(ParentIsContent, aValue); } + void SetIsInDocument() { SetBoolFlag(IsInDocument); } + void ClearInDocument() { ClearBoolFlag(IsInDocument); } + void SetIsConnected(bool aConnected) { SetBoolFlag(IsConnected, aConnected); } + void SetNodeIsContent() { SetBoolFlag(NodeIsContent); } + void SetIsElement() { SetBoolFlag(NodeIsElement); } + void SetHasID() { SetBoolFlag(ElementHasID); } + void ClearHasID() { ClearBoolFlag(ElementHasID); } + void SetMayHaveStyle() { SetBoolFlag(ElementMayHaveStyle); } + void SetHasName() { SetBoolFlag(ElementHasName); } + void ClearHasName() { ClearBoolFlag(ElementHasName); } + void SetHasPartAttribute(bool aPart) { SetBoolFlag(ElementHasPart, aPart); } + void SetMayHaveContentEditableAttr() { + SetBoolFlag(ElementMayHaveContentEditableAttr); + } + void SetHasLockedStyleStates() { SetBoolFlag(ElementHasLockedStyleStates); } + void ClearHasLockedStyleStates() { + ClearBoolFlag(ElementHasLockedStyleStates); + } + bool HasLockedStyleStates() const { + return GetBoolFlag(ElementHasLockedStyleStates); + } + void SetHasWeirdParserInsertionMode() { + SetBoolFlag(ElementHasWeirdParserInsertionMode); + } + bool HasWeirdParserInsertionMode() const { + return GetBoolFlag(ElementHasWeirdParserInsertionMode); + } + bool HandlingClick() const { return GetBoolFlag(NodeHandlingClick); } + void SetHandlingClick() { SetBoolFlag(NodeHandlingClick); } + void ClearHandlingClick() { ClearBoolFlag(NodeHandlingClick); } + + void SetSubtreeRootPointer(nsINode* aSubtreeRoot) { + NS_ASSERTION(aSubtreeRoot, "aSubtreeRoot can never be null!"); + NS_ASSERTION(!(IsContent() && IsInUncomposedDoc()) && !IsInShadowTree(), + "Shouldn't be here!"); + mSubtreeRoot = aSubtreeRoot; + } + + void ClearSubtreeRootPointer() { mSubtreeRoot = nullptr; } + + public: + // Makes nsINode object to keep aObject alive. + void BindObject(nsISupports* aObject); + // After calling UnbindObject nsINode object doesn't keep + // aObject alive anymore. + void UnbindObject(nsISupports* aObject); + + void GenerateXPath(nsAString& aResult); + + already_AddRefed<mozilla::dom::AccessibleNode> GetAccessibleNode(); + + /** + * Returns the length of this node, as specified at + * <http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-node-length> + */ + uint32_t Length() const; + + void GetNodeName(mozilla::dom::DOMString& aNodeName) { + const nsString& nodeName = NodeName(); + aNodeName.SetKnownLiveString(nodeName); + } + [[nodiscard]] nsresult GetBaseURI(nsAString& aBaseURI) const; + // Return the base URI for the document. + // The returned value may differ if the document is loaded via XHR, and + // when accessed from chrome privileged script and + // from content privileged script for compatibility. + void GetBaseURIFromJS(nsAString& aBaseURI, CallerType aCallerType, + ErrorResult& aRv) const; + bool HasChildNodes() const { return HasChildren(); } + + // See nsContentUtils::PositionIsBefore for aThisIndex and aOtherIndex usage. + uint16_t CompareDocumentPosition( + nsINode& aOther, mozilla::Maybe<uint32_t>* aThisIndex = nullptr, + mozilla::Maybe<uint32_t>* aOtherIndex = nullptr) const; + void GetNodeValue(nsAString& aNodeValue) { GetNodeValueInternal(aNodeValue); } + void SetNodeValue(const nsAString& aNodeValue, mozilla::ErrorResult& aError) { + SetNodeValueInternal(aNodeValue, aError); + } + virtual void GetNodeValueInternal(nsAString& aNodeValue); + virtual void SetNodeValueInternal(const nsAString& aNodeValue, + mozilla::ErrorResult& aError) { + // The DOM spec says that when nodeValue is defined to be null "setting it + // has no effect", so we don't throw an exception. + } + void EnsurePreInsertionValidity(nsINode& aNewChild, nsINode* aRefChild, + mozilla::ErrorResult& aError); + nsINode* InsertBefore(nsINode& aNode, nsINode* aChild, + mozilla::ErrorResult& aError) { + return ReplaceOrInsertBefore(false, &aNode, aChild, aError); + } + + /** + * See <https://dom.spec.whatwg.org/#dom-node-appendchild>. + */ + nsINode* AppendChild(nsINode& aNode, mozilla::ErrorResult& aError) { + return InsertBefore(aNode, nullptr, aError); + } + + nsINode* ReplaceChild(nsINode& aNode, nsINode& aChild, + mozilla::ErrorResult& aError) { + return ReplaceOrInsertBefore(true, &aNode, &aChild, aError); + } + // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + MOZ_CAN_RUN_SCRIPT_BOUNDARY nsINode* RemoveChild( + nsINode& aChild, mozilla::ErrorResult& aError); + already_AddRefed<nsINode> CloneNode(bool aDeep, mozilla::ErrorResult& aError); + bool IsSameNode(nsINode* aNode); + bool IsEqualNode(nsINode* aNode); + void GetNamespaceURI(nsAString& aNamespaceURI) const { + mNodeInfo->GetNamespaceURI(aNamespaceURI); + } +#ifdef MOZILLA_INTERNAL_API + void GetPrefix(nsAString& aPrefix) { mNodeInfo->GetPrefix(aPrefix); } +#endif + void GetLocalName(mozilla::dom::DOMString& aLocalName) const { + const nsString& localName = LocalName(); + aLocalName.SetKnownLiveString(localName); + } + + nsDOMAttributeMap* GetAttributes(); + + // Helper method to remove this node from its parent. This is not exposed + // through WebIDL. + // Only call this if the node has a parent node. + nsresult RemoveFromParent() { + nsINode* parent = GetParentNode(); + mozilla::ErrorResult rv; + parent->RemoveChild(*this, rv); + return rv.StealNSResult(); + } + + // ChildNode methods + inline mozilla::dom::Element* GetPreviousElementSibling() const; + inline mozilla::dom::Element* GetNextElementSibling() const; + + MOZ_CAN_RUN_SCRIPT void Before(const Sequence<OwningNodeOrString>& aNodes, + ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void After(const Sequence<OwningNodeOrString>& aNodes, + ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void ReplaceWith( + const Sequence<OwningNodeOrString>& aNodes, ErrorResult& aRv); + /** + * Remove this node from its parent, if any. + */ + void Remove(); + + // ParentNode methods + mozilla::dom::Element* GetFirstElementChild() const; + mozilla::dom::Element* GetLastElementChild() const; + + already_AddRefed<nsIHTMLCollection> GetElementsByAttribute( + const nsAString& aAttribute, const nsAString& aValue); + already_AddRefed<nsIHTMLCollection> GetElementsByAttributeNS( + const nsAString& aNamespaceURI, const nsAString& aAttribute, + const nsAString& aValue, ErrorResult& aRv); + + MOZ_CAN_RUN_SCRIPT void Prepend(const Sequence<OwningNodeOrString>& aNodes, + ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void Append(const Sequence<OwningNodeOrString>& aNodes, + ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void ReplaceChildren( + const Sequence<OwningNodeOrString>& aNodes, ErrorResult& aRv); + MOZ_CAN_RUN_SCRIPT void ReplaceChildren(nsINode* aNode, ErrorResult& aRv); + + void GetBoxQuads(const BoxQuadOptions& aOptions, + nsTArray<RefPtr<DOMQuad>>& aResult, CallerType aCallerType, + ErrorResult& aRv); + + void GetBoxQuadsFromWindowOrigin(const BoxQuadOptions& aOptions, + nsTArray<RefPtr<DOMQuad>>& aResult, + ErrorResult& aRv); + + already_AddRefed<DOMQuad> ConvertQuadFromNode( + DOMQuad& aQuad, const TextOrElementOrDocument& aFrom, + const ConvertCoordinateOptions& aOptions, CallerType aCallerType, + ErrorResult& aRv); + already_AddRefed<DOMQuad> ConvertRectFromNode( + DOMRectReadOnly& aRect, const TextOrElementOrDocument& aFrom, + const ConvertCoordinateOptions& aOptions, CallerType aCallerType, + ErrorResult& aRv); + already_AddRefed<DOMPoint> ConvertPointFromNode( + const DOMPointInit& aPoint, const TextOrElementOrDocument& aFrom, + const ConvertCoordinateOptions& aOptions, CallerType aCallerType, + ErrorResult& aRv); + + /** + * See nsSlots::mClosestCommonInclusiveAncestorRanges. + */ + const mozilla::LinkedList<mozilla::dom::AbstractRange>* + GetExistingClosestCommonInclusiveAncestorRanges() const { + if (!HasSlots()) { + return nullptr; + } + return GetExistingSlots()->mClosestCommonInclusiveAncestorRanges.get(); + } + + /** + * See nsSlots::mClosestCommonInclusiveAncestorRanges. + */ + mozilla::LinkedList<mozilla::dom::AbstractRange>* + GetExistingClosestCommonInclusiveAncestorRanges() { + if (!HasSlots()) { + return nullptr; + } + return GetExistingSlots()->mClosestCommonInclusiveAncestorRanges.get(); + } + + /** + * See nsSlots::mClosestCommonInclusiveAncestorRanges. + */ + mozilla::UniquePtr<mozilla::LinkedList<mozilla::dom::AbstractRange>>& + GetClosestCommonInclusiveAncestorRangesPtr() { + return Slots()->mClosestCommonInclusiveAncestorRanges; + } + + nsIWeakReference* GetExistingWeakReference() { + return HasSlots() ? GetExistingSlots()->mWeakReference : nullptr; + } + + protected: + // Override this function to create a custom slots class. + // Must not return null. + virtual nsINode::nsSlots* CreateSlots(); + + bool HasSlots() const { return mSlots != nullptr; } + + nsSlots* GetExistingSlots() const { return mSlots; } + + nsSlots* Slots() { + if (!HasSlots()) { + mSlots = CreateSlots(); + MOZ_ASSERT(mSlots); + } + return GetExistingSlots(); + } + + /** + * Invalidate cached child array inside mChildNodes + * of type nsParentNodeChildContentList. + */ + void InvalidateChildNodes(); + + virtual void GetTextContentInternal(nsAString& aTextContent, + mozilla::OOMReporter& aError); + virtual void SetTextContentInternal(const nsAString& aTextContent, + nsIPrincipal* aSubjectPrincipal, + mozilla::ErrorResult& aError) {} + + void EnsurePreInsertionValidity1(mozilla::ErrorResult& aError); + void EnsurePreInsertionValidity2(bool aReplace, nsINode& aNewChild, + nsINode* aRefChild, + mozilla::ErrorResult& aError); + // TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230) + MOZ_CAN_RUN_SCRIPT_BOUNDARY nsINode* ReplaceOrInsertBefore( + bool aReplace, nsINode* aNewChild, nsINode* aRefChild, + mozilla::ErrorResult& aError); + + /** + * Returns the Element that should be used for resolving namespaces + * on this node (ie the ownerElement for attributes, the documentElement for + * documents, the node itself for elements and for other nodes the parentNode + * if it is an element). + */ + virtual mozilla::dom::Element* GetNameSpaceElement() = 0; + + /** + * Parse the given selector string into a servo SelectorList. + * + * Never returns null if aRv is not failing. + * + * Note that the selector list returned here is owned by the owner doc's + * selector cache. + */ + const mozilla::StyleSelectorList* ParseSelectorList( + const nsACString& aSelectorString, mozilla::ErrorResult&); + + public: + /* Event stuff that documents and elements share. + + Note that we include DOCUMENT_ONLY_EVENT events here so that we + can forward all the document stuff to this implementation. + */ +#define EVENT(name_, id_, type_, struct_) \ + mozilla::dom::EventHandlerNonNull* GetOn##name_() { \ + return GetEventHandler(nsGkAtoms::on##name_); \ + } \ + void SetOn##name_(mozilla::dom::EventHandlerNonNull* handler) { \ + SetEventHandler(nsGkAtoms::on##name_, handler); \ + } +#define TOUCH_EVENT EVENT +#define DOCUMENT_ONLY_EVENT EVENT +#include "mozilla/EventNameList.h" +#undef DOCUMENT_ONLY_EVENT +#undef TOUCH_EVENT +#undef EVENT + + NodeSelectorFlags GetSelectorFlags() const { + return static_cast<NodeSelectorFlags>(mSelectorFlags.Get()); + } + + protected: + static bool Traverse(nsINode* tmp, nsCycleCollectionTraversalCallback& cb); + static void Unlink(nsINode* tmp); + + RefPtr<mozilla::dom::NodeInfo> mNodeInfo; + + // mParent is an owning ref most of the time, except for the case of document + // nodes, so it cannot be represented by nsCOMPtr, so mark is as + // MOZ_OWNING_REF. + nsINode* MOZ_OWNING_REF mParent; + + private: +#ifndef BOOL_FLAGS_ON_WRAPPER_CACHE + // Boolean flags. + uint32_t mBoolFlags; +#endif + + mozilla::RustCell<uint32_t> mSelectorFlags{0}; + + uint32_t mChildCount; + + protected: + // mNextSibling and mFirstChild are strong references while + // mPreviousOrLastSibling is a weak ref. |mFirstChild->mPreviousOrLastSibling| + // points to the last child node. + nsCOMPtr<nsIContent> mFirstChild; + nsCOMPtr<nsIContent> mNextSibling; + nsIContent* MOZ_NON_OWNING_REF mPreviousOrLastSibling; + + union { + // Pointer to our primary frame. Might be null. + nsIFrame* mPrimaryFrame; + + // Pointer to the root of our subtree. Might be null. + // This reference is non-owning and safe, since it either points to the + // object itself, or is reset by ClearSubtreeRootPointer. + nsINode* MOZ_NON_OWNING_REF mSubtreeRoot; + }; + + // Storage for more members that are usually not needed; allocated lazily. + nsSlots* mSlots; +}; + +NON_VIRTUAL_ADDREF_RELEASE(nsINode) + +inline nsINode* mozilla::dom::EventTarget::GetAsNode() { + return IsNode() ? AsNode() : nullptr; +} + +inline const nsINode* mozilla::dom::EventTarget::GetAsNode() const { + return const_cast<mozilla::dom::EventTarget*>(this)->GetAsNode(); +} + +inline nsINode* mozilla::dom::EventTarget::AsNode() { + MOZ_DIAGNOSTIC_ASSERT(IsNode()); + return static_cast<nsINode*>(this); +} + +inline const nsINode* mozilla::dom::EventTarget::AsNode() const { + MOZ_DIAGNOSTIC_ASSERT(IsNode()); + return static_cast<const nsINode*>(this); +} + +// Useful inline function for getting a node given an nsIContent and a Document. +// Returns the first argument cast to nsINode if it is non-null, otherwise +// returns the second (which may be null). We use type variables instead of +// nsIContent* and Document* because the actual types must be +// known for the cast to work. +template <class C, class D> +inline nsINode* NODE_FROM(C& aContent, D& aDocument) { + if (aContent) return static_cast<nsINode*>(aContent); + return static_cast<nsINode*>(aDocument); +} + +NS_DEFINE_STATIC_IID_ACCESSOR(nsINode, NS_INODE_IID) + +inline nsISupports* ToSupports(nsINode* aPointer) { return aPointer; } + +// Some checks are faster to do on nsIContent or Element than on +// nsINode, so spit out FromNode versions taking those types too. +#define NS_IMPL_FROMNODE_GENERIC(_class, _check, _const) \ + template <typename T> \ + static auto FromNode(_const T& aNode) \ + -> decltype(static_cast<_const _class*>(&aNode)) { \ + return aNode._check ? static_cast<_const _class*>(&aNode) : nullptr; \ + } \ + template <typename T> \ + static _const _class* FromNode(_const T* aNode) { \ + return FromNode(*aNode); \ + } \ + template <typename T> \ + static _const _class* FromNodeOrNull(_const T* aNode) { \ + return aNode ? FromNode(*aNode) : nullptr; \ + } \ + template <typename T> \ + static auto FromEventTarget(_const T& aEventTarget) \ + -> decltype(static_cast<_const _class*>(&aEventTarget)) { \ + return aEventTarget.IsNode() && aEventTarget.AsNode()->_check \ + ? static_cast<_const _class*>(&aEventTarget) \ + : nullptr; \ + } \ + template <typename T> \ + static _const _class* FromEventTarget(_const T* aEventTarget) { \ + return FromEventTarget(*aEventTarget); \ + } \ + template <typename T> \ + static _const _class* FromEventTargetOrNull(_const T* aEventTarget) { \ + return aEventTarget ? FromEventTarget(*aEventTarget) : nullptr; \ + } + +#define NS_IMPL_FROMNODE_HELPER(_class, _check) \ + NS_IMPL_FROMNODE_GENERIC(_class, _check, ) \ + NS_IMPL_FROMNODE_GENERIC(_class, _check, const) \ + \ + template <typename T> \ + static _class* FromNode(T&& aNode) { \ + /* We need the double-cast in case aNode is a smartptr. Those */ \ + /* can cast to superclasses of the type they're templated on, */ \ + /* but not directly to subclasses. */ \ + return aNode->_check ? static_cast<_class*>(static_cast<nsINode*>(aNode)) \ + : nullptr; \ + } \ + template <typename T> \ + static _class* FromNodeOrNull(T&& aNode) { \ + return aNode ? FromNode(aNode) : nullptr; \ + } \ + template <typename T> \ + static _class* FromEventTarget(T&& aEventTarget) { \ + /* We need the double-cast in case aEventTarget is a smartptr. Those */ \ + /* can cast to superclasses of the type they're templated on, */ \ + /* but not directly to subclasses. */ \ + return aEventTarget->IsNode() && aEventTarget->AsNode()->_check \ + ? static_cast<_class*>(static_cast<EventTarget*>(aEventTarget)) \ + : nullptr; \ + } \ + template <typename T> \ + static _class* FromEventTargetOrNull(T&& aEventTarget) { \ + return aEventTarget ? FromEventTarget(aEventTarget) : nullptr; \ + } + +#define NS_IMPL_FROMNODE(_class, _nsid) \ + NS_IMPL_FROMNODE_HELPER(_class, IsInNamespace(_nsid)) + +#define NS_IMPL_FROMNODE_WITH_TAG(_class, _nsid, _tag) \ + NS_IMPL_FROMNODE_HELPER(_class, NodeInfo()->Equals(nsGkAtoms::_tag, _nsid)) + +#define NS_IMPL_FROMNODE_HTML_WITH_TAG(_class, _tag) \ + NS_IMPL_FROMNODE_WITH_TAG(_class, kNameSpaceID_XHTML, _tag) + +#endif /* nsINode_h___ */ |