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gecko-dev/dom/base/nsINode.h

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/* -*- 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/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 "nsIVariant.h" // for use in GetUserData()
#include "nsIWeakReference.h"
#include "nsNodeInfoManager.h" // for use in NodePrincipal()
#include "nsPropertyTable.h" // for typedefs
#include "nsTObserverArray.h" // for member
#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 nsAttrAndChildArray;
class nsAttrChildContentList;
class nsDOMAttributeMap;
class nsIAnimationObserver;
class nsIContent;
class nsIDocument;
class nsIFrame;
class nsIMutationObserver;
class nsINode;
class nsINodeList;
class nsIPresShell;
class nsIPrincipal;
class nsIURI;
class nsNodeSupportsWeakRefTearoff;
class nsDOMMutationObserver;
class nsRange;
class nsWindowSizes;
struct RawServoSelectorList;
namespace mozilla {
class EventListenerManager;
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 AccessibleNode;
struct BoxQuadOptions;
struct ConvertCoordinateOptions;
class DocGroup;
class DocumentFragment;
class DocumentOrShadowRoot;
class DOMPoint;
class DOMQuad;
class DOMRectReadOnly;
class Element;
class EventHandlerNonNull;
class L10nCallback;
template<typename T> class Optional;
class OwningNodeOrString;
class Promise;
template<typename> class Sequence;
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 {
// 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 this node is the root of an anonymous subtree. Note that this
// need not be a native anonymous subtree. Any anonymous subtree, including
// XBL-generated ones, will do. 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_ANONYMOUS_ROOT = NODE_FLAG_BIT(2),
// 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(3),
// 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(4),
// Whether a binding manager may have a pointer to this
NODE_MAY_BE_IN_BINDING_MNGR = NODE_FLAG_BIT(5),
NODE_IS_EDITABLE = NODE_FLAG_BIT(6),
// Free bit here.
// Whether the node participates in a shadow tree.
NODE_IS_IN_SHADOW_TREE = NODE_FLAG_BIT(8),
// Node has an :empty or :-moz-only-whitespace selector
NODE_HAS_EMPTY_SELECTOR = NODE_FLAG_BIT(9),
// A child of the node has a selector such that any insertion,
// removal, or appending of children requires restyling the parent.
NODE_HAS_SLOW_SELECTOR = NODE_FLAG_BIT(10),
// A child of the node has a :first-child, :-moz-first-node,
// :only-child, :last-child or :-moz-last-node selector.
NODE_HAS_EDGE_CHILD_SELECTOR = NODE_FLAG_BIT(11),
// 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.
NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS = NODE_FLAG_BIT(12),
NODE_ALL_SELECTOR_FLAGS = NODE_HAS_EMPTY_SELECTOR |
NODE_HAS_SLOW_SELECTOR |
NODE_HAS_EDGE_CHILD_SELECTOR |
NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS,
// This node needs to go through frame construction to get a frame (or
// undisplayed entry).
NODE_NEEDS_FRAME = NODE_FLAG_BIT(13),
// 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(14),
// Set if the node has the accesskey attribute set.
NODE_HAS_ACCESSKEY = NODE_FLAG_BIT(15),
// Set if the node has right-to-left directionality
NODE_HAS_DIRECTION_RTL = NODE_FLAG_BIT(16),
// Set if the node has left-to-right directionality
NODE_HAS_DIRECTION_LTR = NODE_FLAG_BIT(17),
NODE_ALL_DIRECTION_FLAGS = NODE_HAS_DIRECTION_LTR |
NODE_HAS_DIRECTION_RTL,
NODE_CHROME_ONLY_ACCESS = NODE_FLAG_BIT(18),
NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS = NODE_FLAG_BIT(19),
// Remaining bits are node type specific.
NODE_TYPE_SPECIFIC_BITS_OFFSET = 20
};
// 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
size_t SizeOfOnlyThis(mozilla::MallocSizeOf aMallocSizeOf) const override;
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 nsIDocument share. An instance of this interface has a list
* of nsIContent children and provides access to them.
*/
class nsINode : public mozilla::dom::EventTarget
{
public:
typedef mozilla::dom::BoxQuadOptions BoxQuadOptions;
typedef mozilla::dom::ConvertCoordinateOptions ConvertCoordinateOptions;
typedef mozilla::dom::DocGroup DocGroup;
typedef mozilla::dom::DOMPoint DOMPoint;
typedef mozilla::dom::DOMPointInit DOMPointInit;
typedef mozilla::dom::DOMQuad DOMQuad;
typedef mozilla::dom::DOMRectReadOnly DOMRectReadOnly;
typedef mozilla::dom::OwningNodeOrString OwningNodeOrString;
typedef mozilla::dom::TextOrElementOrDocument TextOrElementOrDocument;
typedef mozilla::dom::CallerType CallerType;
typedef mozilla::ErrorResult ErrorResult;
// XXXbz Maybe we should codegen a class holding these constants and
// inherit from it...
static const auto ELEMENT_NODE = mozilla::dom::NodeBinding::ELEMENT_NODE;
static const auto ATTRIBUTE_NODE = mozilla::dom::NodeBinding::ATTRIBUTE_NODE;
static const auto TEXT_NODE = mozilla::dom::NodeBinding::TEXT_NODE;
static const auto CDATA_SECTION_NODE =
mozilla::dom::NodeBinding::CDATA_SECTION_NODE;
static const auto ENTITY_REFERENCE_NODE =
mozilla::dom::NodeBinding::ENTITY_REFERENCE_NODE;
static const auto ENTITY_NODE = mozilla::dom::NodeBinding::ENTITY_NODE;
static const auto PROCESSING_INSTRUCTION_NODE =
mozilla::dom::NodeBinding::PROCESSING_INSTRUCTION_NODE;
static const auto COMMENT_NODE = mozilla::dom::NodeBinding::COMMENT_NODE;
static const auto DOCUMENT_NODE = mozilla::dom::NodeBinding::DOCUMENT_NODE;
static const auto DOCUMENT_TYPE_NODE =
mozilla::dom::NodeBinding::DOCUMENT_TYPE_NODE;
static const auto DOCUMENT_FRAGMENT_NODE =
mozilla::dom::NodeBinding::DOCUMENT_FRAGMENT_NODE;
static const auto NOTATION_NODE = mozilla::dom::NodeBinding::NOTATION_NODE;
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 nsNodeUtils;
friend class nsNodeWeakReference;
friend class nsNodeSupportsWeakRefTearoff;
friend class nsAttrAndChildArray;
#ifdef MOZILLA_INTERNAL_API
explicit nsINode(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: mNodeInfo(aNodeInfo)
, mParent(nullptr)
#ifndef BOOL_FLAGS_ON_WRAPPER_CACHE
, mBoolFlags(0)
#endif
, mNextSibling(nullptr)
, mPreviousSibling(nullptr)
, mFirstChild(nullptr)
, mSubtreeRoot(this)
, mSlots(nullptr)
{
}
#endif
virtual ~nsINode();
/**
* Bit-flags to pass (or'ed together) to IsNodeOfType()
*/
enum {
/** form control elements */
eHTML_FORM_CONTROL = 1 << 6,
/** animation elements */
eANIMATION = 1 << 10,
/** filter elements that implement SVGFilterPrimitiveStandardAttributes */
eFILTER = 1 << 11,
/** SVGGeometryElement */
eSHAPE = 1 << 12
};
/**
* API for doing a quick check if a content is of a given
* type, such as Text, Document, Comment ... Use this when you can instead of
* checking the tag.
*
* @param aFlags what types you want to test for (see above)
* @return whether the content matches ALL flags passed in
*/
virtual bool IsNodeOfType(uint32_t aFlags) const = 0;
bool IsContainerNode() const
{
return IsElement() || IsDocument() || IsDocumentFragment();
}
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 nsIDocument.h.
*/
inline nsIDocument* AsDocument();
inline const nsIDocument* AsDocument() const;
/**
* Returns true if this is a document fragment node.
*/
bool IsDocumentFragment() const
{
return NodeType() == DOCUMENT_FRAGMENT_NODE;
}
/**
* 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;
virtual JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;
/**
* 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 nsIDocument.h
/**
* 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;
/**
* Return whether the node is an Element node
*/
bool IsElement() const
{
return GetBoolFlag(NodeIsElement);
}
/**
* 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 this node as nsIContent. Should only be used for nodes for which
* IsContent() is true. This is defined inline in nsIContent.h.
*/
inline nsIContent* AsContent();
inline const nsIContent* AsContent() const;
/*
* 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
*/
virtual uint32_t GetChildCount() const = 0;
/**
* 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
*/
virtual nsIContent* GetChildAt_Deprecated(uint32_t aIndex) const = 0;
/**
* 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
*
* If the return value is not -1, then calling GetChildAt_Deprecated() with
* that value will return aPossibleChild.
*/
virtual int32_t ComputeIndexOf(const nsINode* aPossibleChild) const = 0;
/**
* 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.
*/
nsIDocument* OwnerDoc() const
{
return mNodeInfo->GetDocument();
}
/**
* Return the "owner document" of this node as an nsINode*. Implemented
* in nsIDocument.h.
*/
inline nsINode* OwnerDocAsNode() const;
/**
* 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
*/
nsIDocument* GetUncomposedDoc() const
{
return IsInUncomposedDoc() ? OwnerDoc() : nullptr;
}
/**
* 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.
*/
nsIDocument* GetComposedDoc() const
{
return IsInShadowTree() ?
GetComposedDocInternal() : GetUncomposedDoc();
}
/**
* Returns true if GetComposedDoc() would return a non-null value.
*/
bool IsInComposedDoc() const
{
return IsInUncomposedDoc() || (IsInShadowTree() && GetComposedDocInternal());
}
/**
* 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;
/**
* 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;
}
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(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(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...);
}
inline bool IsXULElement() const
{
return IsElement() && IsInNamespace(kNameSpaceID_XUL);
}
inline bool IsXULElement(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(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;
}
/**
* 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 nsIDocument) that the insert has
* occurred
*
* @throws 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
* nsIDocument::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|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
virtual nsresult InsertChildBefore(nsIContent* aKid, nsIContent* aBeforeThis,
bool aNotify) = 0;
/**
* Insert a content node at a particular index. This method handles calling
* BindToTree on the child appropriately.
*
* @param aKid the content to insert
* @param aIndex the index it is being inserted at (the index it will have
* after it is inserted)
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the insert has
* occurred
*
* @throws 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
* nsIDocument::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|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
virtual nsresult InsertChildAt_Deprecated(nsIContent* aKid, uint32_t aIndex,
bool aNotify) = 0;
/**
* 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 nsIDocument) that the append has
* occurred
*
* @throws 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
* nsIDocument::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|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
nsresult AppendChildTo(nsIContent* aKid, bool aNotify)
{
return InsertChildAt_Deprecated(aKid, GetChildCount(), aNotify);
}
/**
* NOTE: this function is going to be removed soon (hopefully!) Don't use it
* in new code.
*
* Remove a child from this node. This method handles calling UnbindFromTree
* on the child appropriately.
*
* @param aIndex the index of the child to remove
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the remove has
* occurred
*
* Note: If there is no child at aIndex, this method will simply do nothing.
*/
virtual void RemoveChildAt_Deprecated(uint32_t aIndex, bool aNotify) = 0;
/**
* 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 nsIDocument) that the remove has
* occurred
*/
virtual void RemoveChildNode(nsIContent* aKid, bool aNotify) = 0;
/**
* 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(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);
}
/**
* Destroys 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 DeleteProperty(nsAtom* aPropertyName);
/**
* Unset 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* UnsetProperty(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();
}
/**
* 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)) ?
reinterpret_cast<nsIContent*>(mParent) : nullptr;
}
/**
* Get the parent nsINode for this node. This can be either an nsIContent,
* an nsIDocument or an nsIAttribute.
* @return the parent node
*/
nsINode* GetParentNode() const
{
return mParent;
}
/**
* This is similar to above, but in case 'this' is ShadowRoot, we return its
* host element.
*/
nsINode* GetParentOrHostNode() const;
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;
/**
* 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 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;
bool ComputeDefaultWantsUntrusted(mozilla::ErrorResult& aRv) final;
virtual bool IsApzAware() const override;
virtual nsPIDOMWindowOuter* GetOwnerGlobalForBindings() override;
virtual nsIGlobalObject* GetOwnerGlobal() const override;
using mozilla::dom::EventTarget::DispatchEvent;
bool DispatchEvent(mozilla::dom::Event& aEvent,
mozilla::dom::CallerType aCallerType,
mozilla::ErrorResult& aRv) override;
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();
NS_ASSERTION(s->mMutationObservers.IndexOf(aMutationObserver) ==
nsTArray<int>::NoIndex,
"Observer already in the list");
s->mMutationObservers.AppendElement(aMutationObserver);
}
/**
* 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();
s->mMutationObservers.AppendElementUnlessExists(aMutationObserver);
}
/**
* 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.RemoveElement(aMutationObserver);
}
}
/**
* 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
* @param aPreallocateChildren If true, the array of children will be
* preallocated in preparation for a deep copy.
*/
virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult,
bool aPreallocateChildren) 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();
/**
* A list of mutation observers
*/
nsAutoTObserverArray<nsIMutationObserver*, 1> 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' common 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<nsRange>> mCommonAncestorRanges;
/**
* Number of descendant nodes in the uncomposed document that have been
* explicitly set as editable.
*/
uint32_t mEditableDescendantCount;
};
/**
* Functions for managing flags and slots
*/
#ifdef DEBUG
nsSlots* DebugGetSlots()
{
return Slots();
}
#endif
void SetFlags(FlagsType aFlagsToSet)
{
NS_ASSERTION(!(aFlagsToSet & (NODE_IS_ANONYMOUS_ROOT |
NODE_IS_NATIVE_ANONYMOUS_ROOT |
NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
NODE_DESCENDANTS_NEED_FRAMES |
NODE_NEEDS_FRAME |
NODE_CHROME_ONLY_ACCESS)) ||
IsContent(),
"Flag only permitted on nsIContent nodes");
nsWrapperCache::SetFlags(aFlagsToSet);
}
void UnsetFlags(FlagsType aFlagsToUnset)
{
NS_ASSERTION(!(aFlagsToUnset &
(NODE_IS_ANONYMOUS_ROOT |
NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
NODE_IS_NATIVE_ANONYMOUS_ROOT)),
"Trying to unset write-only flags");
nsWrapperCache::UnsetFlags(aFlagsToUnset);
}
void ChangeEditableDescendantCount(int32_t aDelta);
/**
* Returns the count of descendant nodes in the uncomposed
* document that are explicitly set as editable.
*/
uint32_t EditableDescendantCount();
/**
* Sets the editable descendant count to 0. The editable
* descendant count only counts explicitly editable nodes
* that are in the uncomposed document so this method
* should be called when nodes are are removed from it.
*/
void ResetEditableDescendantCount();
void SetEditableFlag(bool aEditable)
{
if (aEditable) {
SetFlags(NODE_IS_EDITABLE);
}
else {
UnsetFlags(NODE_IS_EDITABLE);
}
}
bool IsEditable() const;
/**
* Returns true if |this| or any of its ancestors is native anonymous.
*/
bool IsInNativeAnonymousSubtree() const
{
#ifdef DEBUG
if (HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE)) {
return true;
}
CheckNotNativeAnonymous();
return false;
#else
return HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE);
#endif
}
bool IsInAnonymousSubtree() const;
// Note: This asserts |IsInAnonymousSubtree()|.
bool IsAnonymousContentInSVGUseSubtree() const;
// True for native anonymous content and for XBL content if the binding
// has chromeOnlyContent="true".
bool ChromeOnlyAccess() const
{
return HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE | NODE_CHROME_ONLY_ACCESS);
}
bool IsInShadowTree() const
{
return HasFlag(NODE_IS_IN_SHADOW_TREE);
}
/**
* Returns true if |this| node is the common 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 IsSelectionDescendant() const
{
return IsDescendantOfCommonAncestorForRangeInSelection() ||
IsCommonAncestorForRangeInSelection();
}
/**
* Get the root content of an editor. So, this node must be a descendant of
* an editor. Note that this should be only used for getting input or textarea
* editor's root content. This method doesn't support HTML editors.
*/
nsIContent* GetTextEditorRootContent(
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.
*/
nsIContent* GetSelectionRootContent(nsIPresShell* aPresShell);
nsINodeList* ChildNodes();
nsIContent* GetFirstChild() const { return mFirstChild; }
nsIContent* GetLastChild() const
{
uint32_t count = GetChildCount();
return count > 0 ? GetChildAt_Deprecated(count - 1) : nullptr;
}
/**
* Implementation is in nsIDocument.h, because it needs to cast from
* nsIDocument* to nsINode*.
*/
nsIDocument* GetOwnerDocument() const;
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, and XML
* supports setting a per-node base URI.
*
* @return the base URI
*/
virtual already_AddRefed<nsIURI> GetBaseURI(bool aTryUseXHRDocBaseURI = false) const = 0;
already_AddRefed<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 nsAString& aSelector,
mozilla::ErrorResult& aResult);
already_AddRefed<nsINodeList> QuerySelectorAll(const nsAString& aSelector,
mozilla::ErrorResult& aResult);
protected:
// nsIDocument overrides this with its own (faster) version. This
// should really only be called for elements and document fragments.
mozilla::dom::Element* GetElementById(const nsAString& aId);
public:
void LookupPrefix(const nsAString& aNamespace, nsAString& aResult);
bool IsDefaultNamespace(const nsAString& aNamespaceURI)
{
nsAutoString defaultNamespace;
LookupNamespaceURI(EmptyString(), defaultNamespace);
return aNamespaceURI.Equals(defaultNamespace);
}
void LookupNamespaceURI(const nsAString& aNamespacePrefix,
nsAString& aNamespaceURI);
nsIContent* GetNextSibling() const { return mNextSibling; }
nsIContent* GetPreviousSibling() const { return mPreviousSibling; }
/**
* 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;
private:
nsIDocument* GetComposedDocInternal() const;
nsIContent* GetNextNodeImpl(const nsINode* aRoot,
const bool aSkipChildren) const
{
// Can't use nsContentUtils::ContentIsDescendantOf here, since we
// can't include it here.
#ifdef DEBUG
if (aRoot) {
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;
}
NS_NOTREACHED("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* GetPreviousContent(const nsINode* aRoot = nullptr) const
{
// Can't use nsContentUtils::ContentIsDescendantOf here, since we
// can't include it here.
#ifdef DEBUG
if (aRoot) {
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 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 might have a contenteditable attribute set.
ElementMayHaveContentEditableAttr,
// Set if the node is the common ancestor of the start/end nodes of a Range
// that is in a Selection.
NodeIsCommonAncestorForRangeInSelection,
// Set if the node is a descendant of a node with the above bit set.
NodeIsDescendantOfCommonAncestorForRangeInSelection,
// 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 node has had :hover selectors matched against it
NodeHasRelevantHoverRules,
// 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,
// 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 MayHaveContentEditableAttr() const
{ return GetBoolFlag(ElementMayHaveContentEditableAttr); }
bool IsCommonAncestorForRangeInSelection() const
{ return GetBoolFlag(NodeIsCommonAncestorForRangeInSelection); }
void SetCommonAncestorForRangeInSelection()
{ SetBoolFlag(NodeIsCommonAncestorForRangeInSelection); }
void ClearCommonAncestorForRangeInSelection()
{ ClearBoolFlag(NodeIsCommonAncestorForRangeInSelection); }
bool IsDescendantOfCommonAncestorForRangeInSelection() const
{ return GetBoolFlag(NodeIsDescendantOfCommonAncestorForRangeInSelection); }
void SetDescendantOfCommonAncestorForRangeInSelection()
{ SetBoolFlag(NodeIsDescendantOfCommonAncestorForRangeInSelection); }
void ClearDescendantOfCommonAncestorForRangeInSelection()
{ ClearBoolFlag(NodeIsDescendantOfCommonAncestorForRangeInSelection); }
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 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;
bool HasRelevantHoverRules() const { return GetBoolFlag(NodeHasRelevantHoverRules); }
void SetHasRelevantHoverRules() { SetBoolFlag(NodeHasRelevantHoverRules); }
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); }
protected:
void SetParentIsContent(bool aValue) { SetBoolFlag(ParentIsContent, aValue); }
void SetIsInDocument() { SetBoolFlag(IsInDocument); }
void SetNodeIsContent() { SetBoolFlag(NodeIsContent); }
void ClearInDocument() { ClearBoolFlag(IsInDocument); }
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 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::Promise>
Localize(JSContext* aCx, mozilla::dom::L10nCallback& aCallback, mozilla::ErrorResult& aRv);
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);
}
MOZ_MUST_USE 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();
}
uint16_t CompareDocumentPosition(nsINode& aOther) 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);
}
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);
}
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
mozilla::dom::Element* GetPreviousElementSibling() const;
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;
MOZ_CAN_RUN_SCRIPT void Prepend(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv);
MOZ_CAN_RUN_SCRIPT void Append(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv);
void GetBoxQuads(const BoxQuadOptions& aOptions,
nsTArray<RefPtr<DOMQuad> >& aResult,
CallerType aCallerType,
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);
const mozilla::LinkedList<nsRange>* GetExistingCommonAncestorRanges() const
{
if (!HasSlots()) {
return nullptr;
}
return GetExistingSlots()->mCommonAncestorRanges.get();
}
mozilla::LinkedList<nsRange>* GetExistingCommonAncestorRanges()
{
if (!HasSlots()) {
return nullptr;
}
return GetExistingSlots()->mCommonAncestorRanges.get();
}
mozilla::UniquePtr<mozilla::LinkedList<nsRange>>& GetCommonAncestorRangesPtr()
{
return Slots()->mCommonAncestorRanges;
}
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();
}
nsAutoTObserverArray<nsIMutationObserver*, 1> *GetMutationObservers()
{
return HasSlots() ? &GetExistingSlots()->mMutationObservers : nullptr;
}
/**
* 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)
{
}
#ifdef DEBUG
// Note: virtual so that IsInNativeAnonymousSubtree can be called accross
// module boundaries.
virtual void CheckNotNativeAnonymous() const;
#endif
void EnsurePreInsertionValidity1(nsINode& aNewChild, nsINode* aRefChild,
mozilla::ErrorResult& aError);
void EnsurePreInsertionValidity2(bool aReplace, nsINode& aNewChild,
nsINode* aRefChild,
mozilla::ErrorResult& aError);
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;
/**
* Most of the implementation of the nsINode RemoveChildAt method.
* Should only be called on document, element, and document fragment
* nodes. The aChildArray passed in should be the one for |this|.
*
* @param aIndex The index to remove at.
* @param aNotify Whether to notify.
* @param aKid The kid at aIndex. Must not be null.
* @param aChildArray The child array to work with.
* @param aMutationEvent whether to fire a mutation event for this removal.
*/
void doRemoveChildAt(uint32_t aIndex, bool aNotify, nsIContent* aKid,
nsAttrAndChildArray& aChildArray);
/**
* Most of the implementation of the nsINode InsertChildAt_Deprecated method.
* Should only be called on document, element, and document fragment
* nodes. The aChildArray passed in should be the one for |this|.
*
* @param aKid The child to insert.
* @param aIndex The index to insert at.
* @param aNotify Whether to notify.
* @param aChildArray The child array to work with
*/
nsresult doInsertChildAt(nsIContent* aKid, uint32_t aIndex,
bool aNotify, nsAttrAndChildArray& aChildArray);
/**
* 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 RawServoSelectorList* ParseSelectorList(const nsAString& aSelectorString,
mozilla::ErrorResult&);
public:
/* Event stuff that documents and elements share. This needs to be
NS_IMETHOD because some subclasses implement DOM methods with
this exact name and signature and then the calling convention
needs to match.
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_(); \
void SetOn##name_(mozilla::dom::EventHandlerNonNull* listener);
#define TOUCH_EVENT EVENT
#define DOCUMENT_ONLY_EVENT EVENT
#include "mozilla/EventNameList.h"
#undef DOCUMENT_ONLY_EVENT
#undef TOUCH_EVENT
#undef EVENT
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
protected:
// These references are non-owning and safe, as they are managed by
// nsAttrAndChildArray.
nsIContent* MOZ_NON_OWNING_REF mNextSibling;
nsIContent* MOZ_NON_OWNING_REF mPreviousSibling;
// This reference is non-owning and safe, since in the case of documents,
// it is set to null when the document gets destroyed, and in the case of
// other nodes, the children keep the parents alive.
nsIContent* MOZ_NON_OWNING_REF mFirstChild;
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;
};
// Useful inline function for getting a node given an nsIContent and an
// nsIDocument. 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 nsIDocument* 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; \
}
#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; \
}
#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___ */
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