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gecko-dev/dom/base/nsINode.cpp

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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/. */
/*
* Base class for all DOM nodes.
*/
#include "nsINode.h"
#include "AccessCheck.h"
#include "jsapi.h"
#include "js/JSON.h"
#include "mozAutoDocUpdate.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/CORSMode.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TextEditor.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/CharacterData.h"
#include "mozilla/dom/DocumentType.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/L10nUtilsBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/PromiseNativeHandler.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/SVGUseElement.h"
#include "mozilla/dom/ScriptSettings.h"
#include "nsAttrValueOrString.h"
#include "nsBindingManager.h"
#include "nsCCUncollectableMarker.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentList.h"
#include "nsContentUtils.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDocument.h"
#include "mozilla/dom/Attr.h"
#include "nsDOMAttributeMap.h"
#include "nsDOMCID.h"
#include "nsDOMCSSAttrDeclaration.h"
#include "nsError.h"
#include "nsDOMMutationObserver.h"
#include "nsDOMString.h"
#include "nsDOMTokenList.h"
#include "nsFocusManager.h"
#include "nsFrameSelection.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsIAnonymousContentCreator.h"
#include "nsAtom.h"
#include "nsIBaseWindow.h"
#include "nsICategoryManager.h"
#include "nsIContentInlines.h"
#include "nsIContentIterator.h"
#include "nsIControllers.h"
#include "nsIDocument.h"
#include "nsIDOMEventListener.h"
#include "nsILinkHandler.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/NodeInfoInlines.h"
#include "nsIPresShell.h"
#include "nsIScriptError.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptSecurityManager.h"
#include "nsIScrollableFrame.h"
#include "nsIServiceManager.h"
#include "nsIURL.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsIWebNavigation.h"
#include "nsIWidget.h"
#include "nsLayoutUtils.h"
#include "nsNameSpaceManager.h"
#include "nsNodeInfoManager.h"
#include "nsNodeUtils.h"
#include "nsPIBoxObject.h"
#include "nsPIDOMWindow.h"
#include "nsPresContext.h"
#include "nsString.h"
#include "nsStyleConsts.h"
#include "nsSVGUtils.h"
#include "nsTextNode.h"
#include "nsUnicharUtils.h"
#include "nsXBLBinding.h"
#include "nsXBLPrototypeBinding.h"
#include "nsWindowSizes.h"
#include "mozilla/Preferences.h"
#include "xpcpublic.h"
#include "HTMLLegendElement.h"
#include "nsWrapperCacheInlines.h"
#include "WrapperFactory.h"
#include <algorithm>
#include "nsGlobalWindow.h"
#include "nsDOMMutationObserver.h"
#include "GeometryUtils.h"
#include "nsIAnimationObserver.h"
#include "nsChildContentList.h"
#include "mozilla/dom/NodeBinding.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "XPathGenerator.h"
#ifdef ACCESSIBILITY
#include "mozilla/dom/AccessibleNode.h"
#endif
using namespace mozilla;
using namespace mozilla::dom;
nsINode::nsSlots::nsSlots()
: mWeakReference(nullptr),
mEditableDescendantCount(0)
{
}
nsINode::nsSlots::~nsSlots()
{
if (mChildNodes) {
mChildNodes->DropReference();
}
if (mWeakReference) {
mWeakReference->NoticeNodeDestruction();
}
}
void
nsINode::nsSlots::Traverse(nsCycleCollectionTraversalCallback &cb)
{
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mChildNodes");
cb.NoteXPCOMChild(mChildNodes);
}
void
nsINode::nsSlots::Unlink()
{
if (mChildNodes) {
mChildNodes->DropReference();
}
}
//----------------------------------------------------------------------
#ifdef MOZILLA_INTERNAL_API
nsINode::nsINode(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: mNodeInfo(aNodeInfo)
, mParent(nullptr)
#ifndef BOOL_FLAGS_ON_WRAPPER_CACHE
, mBoolFlags(0)
#endif
, mChildCount(0)
, mPreviousOrLastSibling(nullptr)
, mSubtreeRoot(this)
, mSlots(nullptr)
{
}
#endif
nsINode::~nsINode()
{
MOZ_ASSERT(!HasSlots(), "nsNodeUtils::LastRelease was not called?");
MOZ_ASSERT(mSubtreeRoot == this, "Didn't restore state properly?");
}
void*
nsINode::GetProperty(nsAtom* aPropertyName, nsresult* aStatus) const
{
if (!HasProperties()) { // a fast HasFlag() test
if (aStatus) {
*aStatus = NS_PROPTABLE_PROP_NOT_THERE;
}
return nullptr;
}
return OwnerDoc()->PropertyTable().GetProperty(this, aPropertyName, aStatus);
}
nsresult
nsINode::SetProperty(nsAtom* aPropertyName,
void* aValue,
NSPropertyDtorFunc aDtor,
bool aTransfer)
{
nsresult rv = OwnerDoc()->PropertyTable().SetProperty(this,
aPropertyName,
aValue,
aDtor,
nullptr,
aTransfer);
if (NS_SUCCEEDED(rv)) {
SetFlags(NODE_HAS_PROPERTIES);
}
return rv;
}
void
nsINode::DeleteProperty(nsAtom* aPropertyName)
{
OwnerDoc()->PropertyTable().DeleteProperty(this, aPropertyName);
}
void*
nsINode::UnsetProperty(nsAtom* aPropertyName, nsresult* aStatus)
{
return OwnerDoc()->PropertyTable().UnsetProperty(this, aPropertyName, aStatus);
}
nsINode::nsSlots*
nsINode::CreateSlots()
{
return new nsSlots();
}
nsIContent*
nsINode::GetTextEditorRootContent(TextEditor** aTextEditor)
{
if (aTextEditor) {
*aTextEditor = nullptr;
}
for (nsINode* node = this; node; node = node->GetParentNode()) {
if (!node->IsElement() ||
!node->IsHTMLElement())
continue;
RefPtr<TextEditor> textEditor =
static_cast<nsGenericHTMLElement*>(node)->GetTextEditorInternal();
if (!textEditor) {
continue;
}
MOZ_ASSERT(!textEditor->AsHTMLEditor(),
"If it were an HTML editor, needs to use GetRootElement()");
Element* rootElement = textEditor->GetRoot();
if (aTextEditor) {
textEditor.forget(aTextEditor);
}
return rootElement;
}
return nullptr;
}
nsINode* nsINode::GetRootNode(const GetRootNodeOptions& aOptions)
{
if (aOptions.mComposed) {
if (nsIDocument* doc = GetComposedDoc()) {
return doc;
}
nsINode* node = this;
while(node) {
node = node->SubtreeRoot();
ShadowRoot* shadow = ShadowRoot::FromNode(node);
if (!shadow) {
break;
}
node = shadow->GetHost();
}
return node;
}
return SubtreeRoot();
}
nsINode*
nsINode::GetParentOrHostNode() const
{
if (mParent) {
return mParent;
}
const ShadowRoot* shadowRoot = ShadowRoot::FromNode(this);
return shadowRoot ? shadowRoot->GetHost() : nullptr;
}
nsINode*
nsINode::SubtreeRoot() const
{
auto RootOfNode = [](const nsINode* aStart) -> nsINode* {
const nsINode* node = aStart;
const nsINode* iter = node;
while ((iter = iter->GetParentNode())) {
node = iter;
}
return const_cast<nsINode*>(node);
};
// There are four cases of interest here. nsINodes that are really:
// 1. nsIDocument nodes - Are always in the document.
// 2.a nsIContent nodes not in a shadow tree - Are either in the document,
// or mSubtreeRoot is updated in BindToTree/UnbindFromTree.
// 2.b nsIContent nodes in a shadow tree - Are never in the document,
// ignore mSubtreeRoot and return the containing shadow root.
// 4. Attr nodes - Are never in the document, and mSubtreeRoot
// is always 'this' (as set in nsINode's ctor).
nsINode* node;
if (IsInUncomposedDoc()) {
node = OwnerDocAsNode();
} else if (IsContent()) {
ShadowRoot* containingShadow = AsContent()->GetContainingShadow();
node = containingShadow ? containingShadow : mSubtreeRoot;
if (!node) {
NS_WARNING("Using SubtreeRoot() on unlinked element?");
node = RootOfNode(this);
}
} else {
node = mSubtreeRoot;
}
MOZ_ASSERT(node, "Should always have a node here!");
#ifdef DEBUG
{
const nsINode* slowNode = RootOfNode(this);
MOZ_ASSERT(slowNode == node, "These should always be in sync!");
}
#endif
return node;
}
static nsIContent* GetRootForContentSubtree(nsIContent* aContent)
{
NS_ENSURE_TRUE(aContent, nullptr);
// Special case for ShadowRoot because the ShadowRoot itself is
// the root. This is necessary to prevent selection from crossing
// the ShadowRoot boundary.
ShadowRoot* containingShadow = aContent->GetContainingShadow();
if (containingShadow) {
return containingShadow;
}
nsIContent* stop = aContent->GetBindingParent();
while (aContent) {
nsIContent* parent = aContent->GetParent();
if (parent == stop) {
break;
}
aContent = parent;
}
return aContent;
}
nsIContent*
nsINode::GetSelectionRootContent(nsIPresShell* aPresShell)
{
NS_ENSURE_TRUE(aPresShell, nullptr);
if (IsDocument())
return AsDocument()->GetRootElement();
if (!IsContent())
return nullptr;
if (GetComposedDoc() != aPresShell->GetDocument()) {
return nullptr;
}
if (static_cast<nsIContent*>(this)->HasIndependentSelection()) {
// This node should be a descendant of input/textarea editor.
nsIContent* content = GetTextEditorRootContent();
if (content)
return content;
}
nsPresContext* presContext = aPresShell->GetPresContext();
if (presContext) {
HTMLEditor* htmlEditor = nsContentUtils::GetHTMLEditor(presContext);
if (htmlEditor) {
// This node is in HTML editor.
nsIDocument* doc = GetComposedDoc();
if (!doc || doc->HasFlag(NODE_IS_EDITABLE) ||
!HasFlag(NODE_IS_EDITABLE)) {
nsIContent* editorRoot = htmlEditor->GetRoot();
NS_ENSURE_TRUE(editorRoot, nullptr);
return nsContentUtils::IsInSameAnonymousTree(this, editorRoot) ?
editorRoot :
GetRootForContentSubtree(static_cast<nsIContent*>(this));
}
// If the document isn't editable but this is editable, this is in
// contenteditable. Use the editing host element for selection root.
return static_cast<nsIContent*>(this)->GetEditingHost();
}
}
RefPtr<nsFrameSelection> fs = aPresShell->FrameSelection();
nsIContent* content = fs->GetLimiter();
if (!content) {
content = fs->GetAncestorLimiter();
if (!content) {
nsIDocument* doc = aPresShell->GetDocument();
NS_ENSURE_TRUE(doc, nullptr);
content = doc->GetRootElement();
if (!content)
return nullptr;
}
}
// This node might be in another subtree, if so, we should find this subtree's
// root. Otherwise, we can return the content simply.
NS_ENSURE_TRUE(content, nullptr);
if (!nsContentUtils::IsInSameAnonymousTree(this, content)) {
content = GetRootForContentSubtree(static_cast<nsIContent*>(this));
// Fixup for ShadowRoot because the ShadowRoot itself does not have a frame.
// Use the host as the root.
if (ShadowRoot* shadowRoot = ShadowRoot::FromNode(content)) {
content = shadowRoot->GetHost();
}
}
return content;
}
nsINodeList*
nsINode::ChildNodes()
{
nsSlots* slots = Slots();
if (!slots->mChildNodes) {
slots->mChildNodes = IsAttr()
? new nsAttrChildContentList(this)
: new nsParentNodeChildContentList(this);
}
return slots->mChildNodes;
}
nsIContent*
nsINode::GetLastChild() const
{
return mFirstChild ? mFirstChild->mPreviousOrLastSibling : nullptr;
}
void
nsINode::InvalidateChildNodes()
{
MOZ_ASSERT(!IsAttr());
nsSlots* slots = GetExistingSlots();
if (!slots || !slots->mChildNodes) {
return;
}
auto childNodes =
static_cast<nsParentNodeChildContentList*>(slots->mChildNodes.get());
childNodes->InvalidateCache();
}
void
nsINode::GetTextContentInternal(nsAString& aTextContent, OOMReporter& aError)
{
SetDOMStringToNull(aTextContent);
}
DocumentOrShadowRoot*
nsINode::GetUncomposedDocOrConnectedShadowRoot() const
{
if (IsInUncomposedDoc()) {
return OwnerDoc();
}
if (IsInComposedDoc() && IsInShadowTree()) {
return AsContent()->GetContainingShadow();
}
return nullptr;
}
#ifdef DEBUG
void
nsINode::CheckNotNativeAnonymous() const
{
if (!IsContent())
return;
nsIContent* content = static_cast<const nsIContent *>(this)->GetBindingParent();
while (content) {
if (content->IsRootOfNativeAnonymousSubtree()) {
NS_ERROR("Element not marked to be in native anonymous subtree!");
break;
}
content = content->GetBindingParent();
}
}
#endif
bool
nsINode::IsInAnonymousSubtree() const
{
if (!IsContent()) {
return false;
}
return AsContent()->IsInAnonymousSubtree();
}
std::ostream&
operator<<(std::ostream& aStream, const nsINode& aNode)
{
nsAutoString elemDesc;
const nsINode* curr = &aNode;
while (curr) {
const nsString& localName = curr->LocalName();
nsString id;
if (curr->IsElement()) {
curr->AsElement()->GetId(id);
}
if (!elemDesc.IsEmpty()) {
elemDesc = elemDesc + NS_LITERAL_STRING(".");
}
elemDesc = elemDesc + localName;
if (!id.IsEmpty()) {
elemDesc = elemDesc + NS_LITERAL_STRING("['") + id +
NS_LITERAL_STRING("']");
}
curr = curr->GetParentNode();
}
NS_ConvertUTF16toUTF8 str(elemDesc);
return aStream << str.get();
}
SVGUseElement*
nsINode::DoGetContainingSVGUseShadowHost() const
{
MOZ_ASSERT(IsInShadowTree());
return SVGUseElement::FromNodeOrNull(AsContent()->GetContainingShadowHost());
}
bool
nsINode::IsInUAWidget() const
{
if (!IsInShadowTree()) {
return false;
}
ShadowRoot* shadowRoot = AsContent()->GetContainingShadow();
return shadowRoot && shadowRoot->IsUAWidget();
}
void
nsINode::GetNodeValueInternal(nsAString& aNodeValue)
{
SetDOMStringToNull(aNodeValue);
}
nsINode*
nsINode::RemoveChild(nsINode& aOldChild, ErrorResult& aError)
{
if (!aOldChild.IsContent()) {
// aOldChild can't be one of our children.
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
if (aOldChild.GetParentNode() == this) {
nsContentUtils::MaybeFireNodeRemoved(&aOldChild, this);
}
// Check again, we may not be the child's parent anymore.
// Can be triggered by dom/base/crashtests/293388-1.html
if (aOldChild.AsContent()->IsRootOfAnonymousSubtree() ||
aOldChild.GetParentNode() != this) {
// aOldChild isn't one of our children.
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
RemoveChildNode(aOldChild.AsContent(), true);
return &aOldChild;
}
void
nsINode::Normalize()
{
// First collect list of nodes to be removed
AutoTArray<nsCOMPtr<nsIContent>, 50> nodes;
bool canMerge = false;
for (nsIContent* node = this->GetFirstChild();
node;
node = node->GetNextNode(this)) {
if (node->NodeType() != TEXT_NODE) {
canMerge = false;
continue;
}
if (canMerge || node->TextLength() == 0) {
// No need to touch canMerge. That way we can merge across empty
// textnodes if and only if the node before is a textnode
nodes.AppendElement(node);
}
else {
canMerge = true;
}
// If there's no following sibling, then we need to ensure that we don't
// collect following siblings of our (grand)parent as to-be-removed
canMerge = canMerge && !!node->GetNextSibling();
}
if (nodes.IsEmpty()) {
return;
}
// We're relying on mozAutoSubtreeModified to keep the doc alive here.
nsIDocument* doc = OwnerDoc();
// Batch possible DOMSubtreeModified events.
mozAutoSubtreeModified subtree(doc, nullptr);
// Fire all DOMNodeRemoved events. Optimize the common case of there being
// no listeners
bool hasRemoveListeners = nsContentUtils::
HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEREMOVED);
if (hasRemoveListeners) {
for (uint32_t i = 0; i < nodes.Length(); ++i) {
nsINode* parentNode = nodes[i]->GetParentNode();
if (parentNode) { // Node may have already been removed.
nsContentUtils::MaybeFireNodeRemoved(nodes[i], parentNode);
}
}
}
mozAutoDocUpdate batch(doc, true);
// Merge and remove all nodes
nsAutoString tmpStr;
for (uint32_t i = 0; i < nodes.Length(); ++i) {
nsIContent* node = nodes[i];
// Merge with previous node unless empty
const nsTextFragment* text = node->GetText();
if (text->GetLength()) {
nsIContent* target = node->GetPreviousSibling();
NS_ASSERTION((target && target->NodeType() == TEXT_NODE) ||
hasRemoveListeners,
"Should always have a previous text sibling unless "
"mutation events messed us up");
if (!hasRemoveListeners ||
(target && target->NodeType() == TEXT_NODE)) {
nsTextNode* t = static_cast<nsTextNode*>(target);
if (text->Is2b()) {
t->AppendTextForNormalize(text->Get2b(), text->GetLength(), true, node);
}
else {
tmpStr.Truncate();
text->AppendTo(tmpStr);
t->AppendTextForNormalize(tmpStr.get(), tmpStr.Length(), true, node);
}
}
}
// Remove node
nsCOMPtr<nsINode> parent = node->GetParentNode();
NS_ASSERTION(parent || hasRemoveListeners,
"Should always have a parent unless "
"mutation events messed us up");
if (parent) {
parent->RemoveChildNode(node, true);
}
}
}
nsresult
nsINode::GetBaseURI(nsAString &aURI) const
{
nsCOMPtr<nsIURI> baseURI = GetBaseURI();
nsAutoCString spec;
if (baseURI) {
nsresult rv = baseURI->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
}
CopyUTF8toUTF16(spec, aURI);
return NS_OK;
}
void
nsINode::GetBaseURIFromJS(nsAString& aURI,
CallerType aCallerType,
ErrorResult& aRv) const
{
nsCOMPtr<nsIURI> baseURI = GetBaseURI(aCallerType == CallerType::System);
nsAutoCString spec;
if (baseURI) {
nsresult res = baseURI->GetSpec(spec);
if (NS_FAILED(res)) {
aRv.Throw(res);
return;
}
}
CopyUTF8toUTF16(spec, aURI);
}
already_AddRefed<nsIURI>
nsINode::GetBaseURIObject() const
{
return GetBaseURI(true);
}
void
nsINode::LookupPrefix(const nsAString& aNamespaceURI, nsAString& aPrefix)
{
Element *element = GetNameSpaceElement();
if (element) {
// XXX Waiting for DOM spec to list error codes.
// Trace up the content parent chain looking for the namespace
// declaration that defines the aNamespaceURI namespace. Once found,
// return the prefix (i.e. the attribute localName).
for (nsIContent* content = element; content;
content = content->GetParent()) {
if (!content->IsElement()) {
continue;
}
Element* element = content->AsElement();
uint32_t attrCount = element->GetAttrCount();
for (uint32_t i = 0; i < attrCount; ++i) {
const nsAttrName* name = element->GetAttrNameAt(i);
if (name->NamespaceEquals(kNameSpaceID_XMLNS) &&
element->AttrValueIs(kNameSpaceID_XMLNS, name->LocalName(),
aNamespaceURI, eCaseMatters)) {
// If the localName is "xmlns", the prefix we output should be
// null.
nsAtom* localName = name->LocalName();
if (localName != nsGkAtoms::xmlns) {
localName->ToString(aPrefix);
}
else {
SetDOMStringToNull(aPrefix);
}
return;
}
}
}
}
SetDOMStringToNull(aPrefix);
}
uint16_t
nsINode::CompareDocumentPosition(nsINode& aOtherNode) const
{
if (this == &aOtherNode) {
return 0;
}
if (GetPreviousSibling() == &aOtherNode) {
MOZ_ASSERT(GetParentNode() == aOtherNode.GetParentNode());
return Node_Binding::DOCUMENT_POSITION_PRECEDING;
}
if (GetNextSibling() == &aOtherNode) {
MOZ_ASSERT(GetParentNode() == aOtherNode.GetParentNode());
return Node_Binding::DOCUMENT_POSITION_FOLLOWING;
}
AutoTArray<const nsINode*, 32> parents1, parents2;
const nsINode* node1 = &aOtherNode;
const nsINode* node2 = this;
// Check if either node is an attribute
const Attr* attr1 = Attr::FromNode(node1);
if (attr1) {
const Element* elem = attr1->GetElement();
// If there is an owner element add the attribute
// to the chain and walk up to the element
if (elem) {
node1 = elem;
parents1.AppendElement(attr1);
}
}
if (auto* attr2 = Attr::FromNode(node2)) {
const Element* elem = attr2->GetElement();
if (elem == node1 && attr1) {
// Both nodes are attributes on the same element.
// Compare position between the attributes.
uint32_t i;
const nsAttrName* attrName;
for (i = 0; (attrName = elem->GetAttrNameAt(i)); ++i) {
if (attrName->Equals(attr1->NodeInfo())) {
NS_ASSERTION(!attrName->Equals(attr2->NodeInfo()),
"Different attrs at same position");
return Node_Binding::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |
Node_Binding::DOCUMENT_POSITION_PRECEDING;
}
if (attrName->Equals(attr2->NodeInfo())) {
return Node_Binding::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |
Node_Binding::DOCUMENT_POSITION_FOLLOWING;
}
}
MOZ_ASSERT_UNREACHABLE("neither attribute in the element");
return Node_Binding::DOCUMENT_POSITION_DISCONNECTED;
}
if (elem) {
node2 = elem;
parents2.AppendElement(attr2);
}
}
// We now know that both nodes are either nsIContents or nsIDocuments.
// If either node started out as an attribute, that attribute will have
// the same relative position as its ownerElement, except if the
// ownerElement ends up being the container for the other node
// Build the chain of parents
do {
parents1.AppendElement(node1);
node1 = node1->GetParentNode();
} while (node1);
do {
parents2.AppendElement(node2);
node2 = node2->GetParentNode();
} while (node2);
// Check if the nodes are disconnected.
uint32_t pos1 = parents1.Length();
uint32_t pos2 = parents2.Length();
const nsINode* top1 = parents1.ElementAt(--pos1);
const nsINode* top2 = parents2.ElementAt(--pos2);
if (top1 != top2) {
return top1 < top2 ?
(Node_Binding::DOCUMENT_POSITION_PRECEDING |
Node_Binding::DOCUMENT_POSITION_DISCONNECTED |
Node_Binding::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC) :
(Node_Binding::DOCUMENT_POSITION_FOLLOWING |
Node_Binding::DOCUMENT_POSITION_DISCONNECTED |
Node_Binding::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC);
}
// Find where the parent chain differs and check indices in the parent.
const nsINode* parent = top1;
uint32_t len;
for (len = std::min(pos1, pos2); len > 0; --len) {
const nsINode* child1 = parents1.ElementAt(--pos1);
const nsINode* child2 = parents2.ElementAt(--pos2);
if (child1 != child2) {
// child1 or child2 can be an attribute here. This will work fine since
// ComputeIndexOf will return -1 for the attribute making the
// attribute be considered before any child.
return parent->ComputeIndexOf(child1) < parent->ComputeIndexOf(child2) ?
Node_Binding::DOCUMENT_POSITION_PRECEDING :
Node_Binding::DOCUMENT_POSITION_FOLLOWING;
}
parent = child1;
}
// We hit the end of one of the parent chains without finding a difference
// between the chains. That must mean that one node is an ancestor of the
// other. The one with the shortest chain must be the ancestor.
return pos1 < pos2 ?
(Node_Binding::DOCUMENT_POSITION_PRECEDING |
Node_Binding::DOCUMENT_POSITION_CONTAINS) :
(Node_Binding::DOCUMENT_POSITION_FOLLOWING |
Node_Binding::DOCUMENT_POSITION_CONTAINED_BY);
}
bool
nsINode::IsSameNode(nsINode *other)
{
return other == this;
}
bool
nsINode::IsEqualNode(nsINode* aOther)
{
if (!aOther) {
return false;
}
nsAutoString string1, string2;
nsINode* node1 = this;
nsINode* node2 = aOther;
do {
uint16_t nodeType = node1->NodeType();
if (nodeType != node2->NodeType()) {
return false;
}
mozilla::dom::NodeInfo* nodeInfo1 = node1->mNodeInfo;
mozilla::dom::NodeInfo* nodeInfo2 = node2->mNodeInfo;
if (!nodeInfo1->Equals(nodeInfo2) ||
nodeInfo1->GetExtraName() != nodeInfo2->GetExtraName()) {
return false;
}
switch(nodeType) {
case ELEMENT_NODE:
{
// Both are elements (we checked that their nodeinfos are equal). Do the
// check on attributes.
Element* element1 = node1->AsElement();
Element* element2 = node2->AsElement();
uint32_t attrCount = element1->GetAttrCount();
if (attrCount != element2->GetAttrCount()) {
return false;
}
// Iterate over attributes.
for (uint32_t i = 0; i < attrCount; ++i) {
const nsAttrName* attrName = element1->GetAttrNameAt(i);
#ifdef DEBUG
bool hasAttr =
#endif
element1->GetAttr(attrName->NamespaceID(), attrName->LocalName(),
string1);
NS_ASSERTION(hasAttr, "Why don't we have an attr?");
if (!element2->AttrValueIs(attrName->NamespaceID(),
attrName->LocalName(),
string1,
eCaseMatters)) {
return false;
}
}
break;
}
case TEXT_NODE:
case COMMENT_NODE:
case CDATA_SECTION_NODE:
case PROCESSING_INSTRUCTION_NODE:
{
MOZ_ASSERT(node1->IsCharacterData());
MOZ_ASSERT(node2->IsCharacterData());
string1.Truncate();
static_cast<CharacterData*>(node1)->AppendTextTo(string1);
string2.Truncate();
static_cast<CharacterData*>(node2)->AppendTextTo(string2);
if (!string1.Equals(string2)) {
return false;
}
break;
}
case DOCUMENT_NODE:
case DOCUMENT_FRAGMENT_NODE:
break;
case ATTRIBUTE_NODE:
{
NS_ASSERTION(node1 == this && node2 == aOther,
"Did we come upon an attribute node while walking a "
"subtree?");
node1->GetNodeValue(string1);
node2->GetNodeValue(string2);
// Returning here as to not bother walking subtree. And there is no
// risk that we're half way through walking some other subtree since
// attribute nodes doesn't appear in subtrees.
return string1.Equals(string2);
}
case DOCUMENT_TYPE_NODE:
{
DocumentType* docType1 = static_cast<DocumentType*>(node1);
DocumentType* docType2 = static_cast<DocumentType*>(node2);
// Public ID
docType1->GetPublicId(string1);
docType2->GetPublicId(string2);
if (!string1.Equals(string2)) {
return false;
}
// System ID
docType1->GetSystemId(string1);
docType2->GetSystemId(string2);
if (!string1.Equals(string2)) {
return false;
}
break;
}
default:
MOZ_ASSERT(false, "Unknown node type");
}
nsINode* nextNode = node1->GetFirstChild();
if (nextNode) {
node1 = nextNode;
node2 = node2->GetFirstChild();
}
else {
if (node2->GetFirstChild()) {
// node2 has a firstChild, but node1 doesn't
return false;
}
// Find next sibling, possibly walking parent chain.
while (1) {
if (node1 == this) {
NS_ASSERTION(node2 == aOther, "Should have reached the start node "
"for both trees at the same time");
return true;
}
nextNode = node1->GetNextSibling();
if (nextNode) {
node1 = nextNode;
node2 = node2->GetNextSibling();
break;
}
if (node2->GetNextSibling()) {
// node2 has a nextSibling, but node1 doesn't
return false;
}
node1 = node1->GetParentNode();
node2 = node2->GetParentNode();
NS_ASSERTION(node1 && node2, "no parent while walking subtree");
}
}
} while(node2);
return false;
}
void
nsINode::LookupNamespaceURI(const nsAString& aNamespacePrefix,
nsAString& aNamespaceURI)
{
Element *element = GetNameSpaceElement();
if (!element ||
NS_FAILED(element->LookupNamespaceURIInternal(aNamespacePrefix,
aNamespaceURI))) {
SetDOMStringToNull(aNamespaceURI);
}
}
bool
nsINode::ComputeDefaultWantsUntrusted(ErrorResult& aRv)
{
return !nsContentUtils::IsChromeDoc(OwnerDoc());
}
void
nsINode::GetBoxQuads(const BoxQuadOptions& aOptions,
nsTArray<RefPtr<DOMQuad> >& aResult,
CallerType aCallerType,
mozilla::ErrorResult& aRv)
{
mozilla::GetBoxQuads(this, aOptions, aResult, aCallerType, aRv);
}
already_AddRefed<DOMQuad>
nsINode::ConvertQuadFromNode(DOMQuad& aQuad,
const GeometryNode& aFrom,
const ConvertCoordinateOptions& aOptions,
CallerType aCallerType,
ErrorResult& aRv)
{
return mozilla::ConvertQuadFromNode(this, aQuad, aFrom, aOptions, aCallerType,
aRv);
}
already_AddRefed<DOMQuad>
nsINode::ConvertRectFromNode(DOMRectReadOnly& aRect,
const GeometryNode& aFrom,
const ConvertCoordinateOptions& aOptions,
CallerType aCallerType,
ErrorResult& aRv)
{
return mozilla::ConvertRectFromNode(this, aRect, aFrom, aOptions, aCallerType,
aRv);
}
already_AddRefed<DOMPoint>
nsINode::ConvertPointFromNode(const DOMPointInit& aPoint,
const GeometryNode& aFrom,
const ConvertCoordinateOptions& aOptions,
CallerType aCallerType,
ErrorResult& aRv)
{
return mozilla::ConvertPointFromNode(this, aPoint, aFrom, aOptions,
aCallerType, aRv);
}
bool
nsINode::DispatchEvent(Event& aEvent, CallerType aCallerType, ErrorResult& aRv)
{
// XXX sXBL/XBL2 issue -- do we really want the owner here? What
// if that's the XBL document? Would we want its presshell? Or what?
nsCOMPtr<nsIDocument> document = OwnerDoc();
// Do nothing if the element does not belong to a document
if (!document) {
return true;
}
// Obtain a presentation shell
RefPtr<nsPresContext> context = document->GetPresContext();
nsEventStatus status = nsEventStatus_eIgnore;
nsresult rv =
EventDispatcher::DispatchDOMEvent(this, nullptr, &aEvent, context, &status);
bool retval = !aEvent.DefaultPrevented(aCallerType);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
return retval;
}
nsresult
nsINode::PostHandleEvent(EventChainPostVisitor& /*aVisitor*/)
{
return NS_OK;
}
EventListenerManager*
nsINode::GetOrCreateListenerManager()
{
return nsContentUtils::GetListenerManagerForNode(this);
}
EventListenerManager*
nsINode::GetExistingListenerManager() const
{
return nsContentUtils::GetExistingListenerManagerForNode(this);
}
nsPIDOMWindowOuter*
nsINode::GetOwnerGlobalForBindings()
{
bool dummy;
auto* window = static_cast<nsGlobalWindowInner*>(OwnerDoc()->GetScriptHandlingObject(dummy));
return window ? nsPIDOMWindowOuter::GetFromCurrentInner(window->AsInner()) : nullptr;
}
nsIGlobalObject*
nsINode::GetOwnerGlobal() const
{
bool dummy;
return OwnerDoc()->GetScriptHandlingObject(dummy);
}
void
nsINode::ChangeEditableDescendantCount(int32_t aDelta)
{
if (aDelta == 0) {
return;
}
nsSlots* s = Slots();
MOZ_ASSERT(aDelta > 0 ||
s->mEditableDescendantCount >= (uint32_t) (-1 * aDelta));
s->mEditableDescendantCount += aDelta;
}
void
nsINode::ResetEditableDescendantCount()
{
nsSlots* s = GetExistingSlots();
if (s) {
s->mEditableDescendantCount = 0;
}
}
uint32_t
nsINode::EditableDescendantCount()
{
nsSlots* s = GetExistingSlots();
if (s) {
return s->mEditableDescendantCount;
}
return 0;
}
bool
nsINode::UnoptimizableCCNode() const
{
const uintptr_t problematicFlags = (NODE_IS_ANONYMOUS_ROOT |
NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
NODE_IS_NATIVE_ANONYMOUS_ROOT |
NODE_MAY_BE_IN_BINDING_MNGR);
return HasFlag(problematicFlags) ||
NodeType() == ATTRIBUTE_NODE ||
// For strange cases like xbl:content/xbl:children
(IsElement() &&
AsElement()->IsInNamespace(kNameSpaceID_XBL));
}
/* static */
bool
nsINode::Traverse(nsINode *tmp, nsCycleCollectionTraversalCallback &cb)
{
if (MOZ_LIKELY(!cb.WantAllTraces())) {
nsIDocument* currentDoc = tmp->GetComposedDoc();
if (currentDoc &&
nsCCUncollectableMarker::InGeneration(currentDoc->GetMarkedCCGeneration())) {
return false;
}
if (nsCCUncollectableMarker::sGeneration) {
// If we're black no need to traverse.
if (tmp->HasKnownLiveWrapper() || tmp->InCCBlackTree()) {
return false;
}
if (!tmp->UnoptimizableCCNode()) {
// If we're in a black document, return early.
if ((currentDoc && currentDoc->HasKnownLiveWrapper())) {
return false;
}
// If we're not in anonymous content and we have a black parent,
// return early.
nsIContent* parent = tmp->GetParent();
if (parent && !parent->UnoptimizableCCNode() &&
parent->HasKnownLiveWrapper()) {
MOZ_ASSERT(parent->ComputeIndexOf(tmp) >= 0, "Parent doesn't own us?");
return false;
}
}
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNodeInfo)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFirstChild)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNextSibling)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(GetParent())
nsSlots *slots = tmp->GetExistingSlots();
if (slots) {
slots->Traverse(cb);
}
if (tmp->HasProperties()) {
nsCOMArray<nsISupports>* objects =
static_cast<nsCOMArray<nsISupports>*>(tmp->GetProperty(nsGkAtoms::keepobjectsalive));
if (objects) {
for (int32_t i = 0; i < objects->Count(); ++i) {
cb.NoteXPCOMChild(objects->ObjectAt(i));
}
}
#ifdef ACCESSIBILITY
AccessibleNode* anode =
static_cast<AccessibleNode*>(tmp->GetProperty(nsGkAtoms::accessiblenode));
if (anode) {
cb.NoteXPCOMChild(anode);
}
#endif
}
if (tmp->NodeType() != DOCUMENT_NODE &&
tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) {
nsContentUtils::TraverseListenerManager(tmp, cb);
}
return true;
}
/* static */
void
nsINode::Unlink(nsINode* tmp)
{
tmp->ReleaseWrapper(tmp);
nsSlots *slots = tmp->GetExistingSlots();
if (slots) {
slots->Unlink();
}
if (tmp->NodeType() != DOCUMENT_NODE &&
tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) {
nsContentUtils::RemoveListenerManager(tmp);
tmp->UnsetFlags(NODE_HAS_LISTENERMANAGER);
}
if (tmp->HasProperties()) {
tmp->DeleteProperty(nsGkAtoms::keepobjectsalive);
tmp->DeleteProperty(nsGkAtoms::accessiblenode);
}
}
static void
AdoptNodeIntoOwnerDoc(nsINode *aParent, nsINode *aNode, ErrorResult& aError)
{
NS_ASSERTION(!aNode->GetParentNode(),
"Should have removed from parent already");
nsIDocument *doc = aParent->OwnerDoc();
DebugOnly<nsINode*> adoptedNode = doc->AdoptNode(*aNode, aError);
#ifdef DEBUG
if (!aError.Failed()) {
MOZ_ASSERT(aParent->OwnerDoc() == doc,
"ownerDoc chainged while adopting");
MOZ_ASSERT(adoptedNode == aNode, "Uh, adopt node changed nodes?");
MOZ_ASSERT(aParent->OwnerDoc() == aNode->OwnerDoc(),
"ownerDocument changed again after adopting!");
}
#endif // DEBUG
}
static void
CheckForOutdatedParent(nsINode* aParent, nsINode* aNode, ErrorResult& aError)
{
if (JSObject* existingObjUnrooted = aNode->GetWrapper()) {
JS::Rooted<JSObject*> existingObj(RootingCx(), existingObjUnrooted);
AutoJSContext cx;
nsIGlobalObject* global = aParent->OwnerDoc()->GetScopeObject();
MOZ_ASSERT(global);
if (JS::GetNonCCWObjectGlobal(existingObj) !=
global->GetGlobalJSObject()) {
JSAutoRealm ar(cx, existingObj);
ReparentWrapper(cx, existingObj, aError);
}
}
}
static nsresult
ReparentWrappersInSubtree(nsIContent* aRoot)
{
MOZ_ASSERT(ShouldUseXBLScope(aRoot));
// Start off with no global so we don't fire any error events on failure.
AutoJSAPI jsapi;
jsapi.Init();
JSContext* cx = jsapi.cx();
ErrorResult rv;
JS::Rooted<JSObject*> reflector(cx);
for (nsIContent* cur = aRoot; cur; cur = cur->GetNextNode(aRoot)) {
if ((reflector = cur->GetWrapper())) {
JSAutoRealm ar(cx, reflector);
ReparentWrapper(cx, reflector, rv);
rv.WouldReportJSException();
if (rv.Failed()) {
// We _could_ consider BlastSubtreeToPieces here, but it's not really
// needed. Having some nodes in here accessible to content while others
// are not is probably OK. We just need to fail out of the actual
// insertion, so they're not in the DOM. Returning a failure here will
// do that.
return rv.StealNSResult();
}
}
}
return NS_OK;
}
nsresult
nsINode::InsertChildBefore(nsIContent* aKid, nsIContent* aChildToInsertBefore,
bool aNotify)
{
if (!IsContainerNode()) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
MOZ_ASSERT(!aKid->GetParentNode(), "Inserting node that already has parent");
MOZ_ASSERT(!IsAttr());
// The id-handling code, and in the future possibly other code, need to
// react to unexpected attribute changes.
nsMutationGuard::DidMutate();
// Do this before checking the child-count since this could cause mutations
nsIDocument* doc = GetUncomposedDoc();
mozAutoDocUpdate updateBatch(GetComposedDoc(), aNotify);
if (OwnerDoc() != aKid->OwnerDoc()) {
ErrorResult error;
AdoptNodeIntoOwnerDoc(this, aKid, error);
// Need to WouldReportJSException() if our callee can throw a JS
// exception (which it can) and we're neither propagating the
// error out nor unconditionally suppressing it.
error.WouldReportJSException();
if (NS_WARN_IF(error.Failed())) {
return error.StealNSResult();
}
} else if (OwnerDoc()->DidDocumentOpen()) {
ErrorResult error;
CheckForOutdatedParent(this, aKid, error);
// Need to WouldReportJSException() if our callee can throw a JS
// exception (which it can) and we're neither propagating the
// error out nor unconditionally suppressing it.
error.WouldReportJSException();
if (NS_WARN_IF(error.Failed())) {
return error.StealNSResult();
}
}
if (!aChildToInsertBefore) {
AppendChildToChildList(aKid);
} else {
InsertChildToChildList(aKid, aChildToInsertBefore);
}
nsIContent* parent = IsContent() ? AsContent() : nullptr;
bool wasInXBLScope = ShouldUseXBLScope(aKid);
nsresult rv = aKid->BindToTree(doc, parent,
parent ? parent->GetBindingParent() : nullptr);
if (NS_SUCCEEDED(rv) && !wasInXBLScope && ShouldUseXBLScope(aKid)) {
MOZ_ASSERT(ShouldUseXBLScope(this),
"Why does the kid need to use an XBL scope?");
rv = ReparentWrappersInSubtree(aKid);
}
if (NS_FAILED(rv)) {
DisconnectChild(aKid);
aKid->UnbindFromTree();
return rv;
}
// Invalidate cached array of child nodes
InvalidateChildNodes();
NS_ASSERTION(aKid->GetParentNode() == this,
"Did we run script inappropriately?");
if (aNotify) {
// Note that we always want to call ContentInserted when things are added
// as kids to documents
if (parent && !aChildToInsertBefore) {
nsNodeUtils::ContentAppended(parent, aKid);
} else {
nsNodeUtils::ContentInserted(this, aKid);
}
if (nsContentUtils::HasMutationListeners(aKid,
NS_EVENT_BITS_MUTATION_NODEINSERTED, this)) {
InternalMutationEvent mutation(true, eLegacyNodeInserted);
mutation.mRelatedNode = this;
mozAutoSubtreeModified subtree(OwnerDoc(), this);
(new AsyncEventDispatcher(aKid, mutation))->RunDOMEventWhenSafe();
}
}
return NS_OK;
}
nsIContent*
nsINode::GetPreviousSibling() const
{
// Do not expose circular linked list
if (mPreviousOrLastSibling && !mPreviousOrLastSibling->mNextSibling) {
return nullptr;
}
return mPreviousOrLastSibling;
}
void
nsINode::AppendChildToChildList(nsIContent* aKid)
{
MOZ_ASSERT(aKid);
MOZ_ASSERT(!aKid->mNextSibling);
if (mFirstChild) {
nsIContent* lastChild = GetLastChild();
lastChild->mNextSibling = aKid;
aKid->mPreviousOrLastSibling = lastChild;
} else {
mFirstChild = aKid;
}
// Maintain link to the last child
mFirstChild->mPreviousOrLastSibling = aKid;
++mChildCount;
}
void
nsINode::InsertChildToChildList(nsIContent* aKid, nsIContent* aNextSibling)
{
MOZ_ASSERT(aKid);
MOZ_ASSERT(aNextSibling);
nsIContent* previousSibling = aNextSibling->mPreviousOrLastSibling;
aNextSibling->mPreviousOrLastSibling = aKid;
aKid->mPreviousOrLastSibling = previousSibling;
aKid->mNextSibling = aNextSibling;
if (aNextSibling == mFirstChild) {
MOZ_ASSERT(!previousSibling->mNextSibling);
mFirstChild = aKid;
} else {
previousSibling->mNextSibling = aKid;
}
++mChildCount;
}
void
nsINode::DisconnectChild(nsIContent* aKid)
{
MOZ_ASSERT(aKid);
MOZ_ASSERT(GetChildCount() > 0);
nsIContent* previousSibling = aKid->GetPreviousSibling();
nsCOMPtr<nsIContent> ref = aKid;
if (aKid->mNextSibling) {
aKid->mNextSibling->mPreviousOrLastSibling = aKid->mPreviousOrLastSibling;
} else {
// aKid is the last child in the list
mFirstChild->mPreviousOrLastSibling = aKid->mPreviousOrLastSibling;
}
aKid->mPreviousOrLastSibling = nullptr;
if (previousSibling) {
previousSibling->mNextSibling = aKid->mNextSibling.forget();
} else {
// aKid is the first child in the list
mFirstChild = aKid->mNextSibling.forget();
}
--mChildCount;
}
nsIContent*
nsINode::GetChildAt_Deprecated(uint32_t aIndex) const
{
if (aIndex >= GetChildCount()) {
return nullptr;
}
nsIContent* child = mFirstChild;
while (aIndex--) {
child = child->GetNextSibling();
}
return child;
}
int32_t
nsINode::ComputeIndexOf(const nsINode* aChild) const
{
if (!aChild) {
return -1;
}
if (aChild->GetParentNode() != this) {
return -1;
}
if (aChild == GetLastChild()) {
return GetChildCount() - 1;
}
int32_t index = 0;
nsINode* current = mFirstChild;
while (current) {
MOZ_ASSERT(current->GetParentNode() == this);
if (current == aChild) {
return index;
}
current = current->GetNextSibling();
++index;
}
return -1;
}
Element*
nsINode::GetPreviousElementSibling() const
{
nsIContent* previousSibling = GetPreviousSibling();
while (previousSibling) {
if (previousSibling->IsElement()) {
return previousSibling->AsElement();
}
previousSibling = previousSibling->GetPreviousSibling();
}
return nullptr;
}
Element*
nsINode::GetNextElementSibling() const
{
nsIContent* nextSibling = GetNextSibling();
while (nextSibling) {
if (nextSibling->IsElement()) {
return nextSibling->AsElement();
}
nextSibling = nextSibling->GetNextSibling();
}
return nullptr;
}
static already_AddRefed<nsINode>
GetNodeFromNodeOrString(const OwningNodeOrString& aNode,
nsIDocument* aDocument)
{
if (aNode.IsNode()) {
nsCOMPtr<nsINode> node = aNode.GetAsNode();
return node.forget();
}
if (aNode.IsString()){
RefPtr<nsTextNode> textNode =
aDocument->CreateTextNode(aNode.GetAsString());
return textNode.forget();
}
MOZ_CRASH("Impossible type");
}
/**
* Implement the algorithm specified at
* https://dom.spec.whatwg.org/#converting-nodes-into-a-node for |prepend()|,
* |append()|, |before()|, |after()|, and |replaceWith()| APIs.
*/
MOZ_CAN_RUN_SCRIPT static already_AddRefed<nsINode>
ConvertNodesOrStringsIntoNode(const Sequence<OwningNodeOrString>& aNodes,
nsIDocument* aDocument,
ErrorResult& aRv)
{
if (aNodes.Length() == 1) {
return GetNodeFromNodeOrString(aNodes[0], aDocument);
}
nsCOMPtr<nsINode> fragment = aDocument->CreateDocumentFragment();
for (const auto& node : aNodes) {
nsCOMPtr<nsINode> childNode = GetNodeFromNodeOrString(node, aDocument);
fragment->AppendChild(*childNode, aRv);
if (aRv.Failed()) {
return nullptr;
}
}
return fragment.forget();
}
static void
InsertNodesIntoHashset(const Sequence<OwningNodeOrString>& aNodes,
nsTHashtable<nsPtrHashKey<nsINode>>& aHashset)
{
for (const auto& node : aNodes) {
if (node.IsNode()) {
aHashset.PutEntry(node.GetAsNode());
}
}
}
static nsINode*
FindViablePreviousSibling(const nsINode& aNode,
const Sequence<OwningNodeOrString>& aNodes)
{
nsTHashtable<nsPtrHashKey<nsINode>> nodeSet(16);
InsertNodesIntoHashset(aNodes, nodeSet);
nsINode* viablePreviousSibling = nullptr;
for (nsINode* sibling = aNode.GetPreviousSibling(); sibling;
sibling = sibling->GetPreviousSibling()) {
if (!nodeSet.Contains(sibling)) {
viablePreviousSibling = sibling;
break;
}
}
return viablePreviousSibling;
}
static nsINode*
FindViableNextSibling(const nsINode& aNode,
const Sequence<OwningNodeOrString>& aNodes)
{
nsTHashtable<nsPtrHashKey<nsINode>> nodeSet(16);
InsertNodesIntoHashset(aNodes, nodeSet);
nsINode* viableNextSibling = nullptr;
for (nsINode* sibling = aNode.GetNextSibling(); sibling;
sibling = sibling->GetNextSibling()) {
if (!nodeSet.Contains(sibling)) {
viableNextSibling = sibling;
break;
}
}
return viableNextSibling;
}
void
nsINode::Before(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv)
{
nsCOMPtr<nsINode> parent = GetParentNode();
if (!parent) {
return;
}
nsCOMPtr<nsINode> viablePreviousSibling =
FindViablePreviousSibling(*this, aNodes);
nsCOMPtr<nsIDocument> doc = OwnerDoc();
nsCOMPtr<nsINode> node = ConvertNodesOrStringsIntoNode(aNodes, doc, aRv);
if (aRv.Failed()) {
return;
}
viablePreviousSibling = viablePreviousSibling ?
viablePreviousSibling->GetNextSibling() : parent->GetFirstChild();
parent->InsertBefore(*node, viablePreviousSibling, aRv);
}
void
nsINode::After(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv)
{
nsCOMPtr<nsINode> parent = GetParentNode();
if (!parent) {
return;
}
nsCOMPtr<nsINode> viableNextSibling = FindViableNextSibling(*this, aNodes);
nsCOMPtr<nsIDocument> doc = OwnerDoc();
nsCOMPtr<nsINode> node = ConvertNodesOrStringsIntoNode(aNodes, doc, aRv);
if (aRv.Failed()) {
return;
}
parent->InsertBefore(*node, viableNextSibling, aRv);
}
void
nsINode::ReplaceWith(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv)
{
nsCOMPtr<nsINode> parent = GetParentNode();
if (!parent) {
return;
}
nsCOMPtr<nsINode> viableNextSibling = FindViableNextSibling(*this, aNodes);
nsCOMPtr<nsIDocument> doc = OwnerDoc();
nsCOMPtr<nsINode> node = ConvertNodesOrStringsIntoNode(aNodes, doc, aRv);
if (aRv.Failed()) {
return;
}
if (parent == GetParentNode()) {
parent->ReplaceChild(*node, *this, aRv);
} else {
parent->InsertBefore(*node, viableNextSibling, aRv);
}
}
void
nsINode::Remove()
{
nsCOMPtr<nsINode> parent = GetParentNode();
if (!parent) {
return;
}
parent->RemoveChild(*this, IgnoreErrors());
}
Element*
nsINode::GetFirstElementChild() const
{
for (nsIContent* child = GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child->IsElement()) {
return child->AsElement();
}
}
return nullptr;
}
Element*
nsINode::GetLastElementChild() const
{
for (nsIContent* child = GetLastChild();
child;
child = child->GetPreviousSibling()) {
if (child->IsElement()) {
return child->AsElement();
}
}
return nullptr;
}
static
bool MatchAttribute(Element* aElement,
int32_t aNamespaceID,
nsAtom* aAttrName,
void* aData)
{
MOZ_ASSERT(aElement, "Must have content node to work with!");
nsString* attrValue = static_cast<nsString*>(aData);
if (aNamespaceID != kNameSpaceID_Unknown &&
aNamespaceID != kNameSpaceID_Wildcard) {
return attrValue->EqualsLiteral("*") ?
aElement->HasAttr(aNamespaceID, aAttrName) :
aElement->AttrValueIs(aNamespaceID, aAttrName, *attrValue,
eCaseMatters);
}
// Qualified name match. This takes more work.
uint32_t count = aElement->GetAttrCount();
for (uint32_t i = 0; i < count; ++i) {
const nsAttrName* name = aElement->GetAttrNameAt(i);
bool nameMatch;
if (name->IsAtom()) {
nameMatch = name->Atom() == aAttrName;
} else if (aNamespaceID == kNameSpaceID_Wildcard) {
nameMatch = name->NodeInfo()->Equals(aAttrName);
} else {
nameMatch = name->NodeInfo()->QualifiedNameEquals(aAttrName);
}
if (nameMatch) {
return attrValue->EqualsLiteral("*") ||
aElement->AttrValueIs(name->NamespaceID(), name->LocalName(),
*attrValue, eCaseMatters);
}
}
return false;
}
already_AddRefed<nsIHTMLCollection>
nsINode::GetElementsByAttribute(const nsAString& aAttribute,
const nsAString& aValue)
{
RefPtr<nsAtom> attrAtom(NS_Atomize(aAttribute));
nsAutoPtr<nsString> attrValue(new nsString(aValue));
RefPtr<nsContentList> list = new nsContentList(this,
MatchAttribute,
nsContentUtils::DestroyMatchString,
attrValue.forget(),
true,
attrAtom,
kNameSpaceID_Unknown);
return list.forget();
}
already_AddRefed<nsIHTMLCollection>
nsINode::GetElementsByAttributeNS(const nsAString& aNamespaceURI,
const nsAString& aAttribute,
const nsAString& aValue,
ErrorResult& aRv)
{
RefPtr<nsAtom> attrAtom(NS_Atomize(aAttribute));
nsAutoPtr<nsString> attrValue(new nsString(aValue));
int32_t nameSpaceId = kNameSpaceID_Wildcard;
if (!aNamespaceURI.EqualsLiteral("*")) {
nsresult rv =
nsContentUtils::NameSpaceManager()->RegisterNameSpace(aNamespaceURI,
nameSpaceId);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return nullptr;
}
}
RefPtr<nsContentList> list = new nsContentList(this,
MatchAttribute,
nsContentUtils::DestroyMatchString,
attrValue.forget(),
true,
attrAtom,
nameSpaceId);
return list.forget();
}
void
nsINode::Prepend(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv)
{
nsCOMPtr<nsIDocument> doc = OwnerDoc();
nsCOMPtr<nsINode> node = ConvertNodesOrStringsIntoNode(aNodes, doc, aRv);
if (aRv.Failed()) {
return;
}
nsCOMPtr<nsIContent> refNode = mFirstChild;;
InsertBefore(*node, refNode, aRv);
}
void
nsINode::Append(const Sequence<OwningNodeOrString>& aNodes,
ErrorResult& aRv)
{
nsCOMPtr<nsIDocument> doc = OwnerDoc();
nsCOMPtr<nsINode> node = ConvertNodesOrStringsIntoNode(aNodes, doc, aRv);
if (aRv.Failed()) {
return;
}
AppendChild(*node, aRv);
}
void
nsINode::RemoveChildNode(nsIContent* aKid, bool aNotify)
{
// NOTE: This function must not trigger any calls to
// nsIDocument::GetRootElement() calls until *after* it has removed aKid from
// aChildArray. Any calls before then could potentially restore a stale
// value for our cached root element, per note in
// nsDocument::RemoveChildNode().
MOZ_ASSERT(aKid && aKid->GetParentNode() == this, "Bogus aKid");
MOZ_ASSERT(!IsAttr());
nsMutationGuard::DidMutate();
mozAutoDocUpdate updateBatch(GetComposedDoc(), aNotify);
nsIContent* previousSibling = aKid->GetPreviousSibling();
// Since aKid is use also after DisconnectChild, ensure it stays alive.
nsCOMPtr<nsIContent> kungfuDeathGrip = aKid;
DisconnectChild(aKid);
// Invalidate cached array of child nodes
InvalidateChildNodes();
if (aNotify) {
nsNodeUtils::ContentRemoved(this, aKid, previousSibling);
}
aKid->UnbindFromTree();
}
// When replacing, aRefChild is the content being replaced; when
// inserting it's the content before which we're inserting. In the
// latter case it may be null.
static
bool IsAllowedAsChild(nsIContent* aNewChild, nsINode* aParent,
bool aIsReplace, nsINode* aRefChild)
{
MOZ_ASSERT(aNewChild, "Must have new child");
MOZ_ASSERT_IF(aIsReplace, aRefChild);
MOZ_ASSERT(aParent);
MOZ_ASSERT(aParent->IsDocument() ||
aParent->IsDocumentFragment() ||
aParent->IsElement(),
"Nodes that are not documents, document fragments or elements "
"can't be parents!");
// A common case is that aNewChild has no kids, in which case
// aParent can't be a descendant of aNewChild unless they're
// actually equal to each other. Fast-path that case, since aParent
// could be pretty deep in the DOM tree.
if (aNewChild == aParent ||
((aNewChild->GetFirstChild() ||
// HTML template elements and ShadowRoot hosts need
// to be checked to ensure that they are not inserted into
// the hosted content.
aNewChild->NodeInfo()->NameAtom() == nsGkAtoms::_template ||
aNewChild->GetShadowRoot()) &&
nsContentUtils::ContentIsHostIncludingDescendantOf(aParent,
aNewChild))) {
return false;
}
// The allowed child nodes differ for documents and elements
switch (aNewChild->NodeType()) {
case nsINode::COMMENT_NODE :
case nsINode::PROCESSING_INSTRUCTION_NODE :
// OK in both cases
return true;
case nsINode::TEXT_NODE :
case nsINode::CDATA_SECTION_NODE :
case nsINode::ENTITY_REFERENCE_NODE :
// Allowed under Elements and DocumentFragments
return aParent->NodeType() != nsINode::DOCUMENT_NODE;
case nsINode::ELEMENT_NODE :
{
if (!aParent->IsDocument()) {
// Always ok to have elements under other elements or document fragments
return true;
}
nsIDocument* parentDocument = aParent->AsDocument();
Element* rootElement = parentDocument->GetRootElement();
if (rootElement) {
// Already have a documentElement, so this is only OK if we're
// replacing it.
return aIsReplace && rootElement == aRefChild;
}
// We don't have a documentElement yet. Our one remaining constraint is
// that the documentElement must come after the doctype.
if (!aRefChild) {
// Appending is just fine.
return true;
}
nsIContent* docTypeContent = parentDocument->GetDoctype();
if (!docTypeContent) {
// It's all good.
return true;
}
int32_t doctypeIndex = aParent->ComputeIndexOf(docTypeContent);
int32_t insertIndex = aParent->ComputeIndexOf(aRefChild);
// Now we're OK in the following two cases only:
// 1) We're replacing something that's not before the doctype
// 2) We're inserting before something that comes after the doctype
return aIsReplace ? (insertIndex >= doctypeIndex) :
insertIndex > doctypeIndex;
}
case nsINode::DOCUMENT_TYPE_NODE :
{
if (!aParent->IsDocument()) {
// doctypes only allowed under documents
return false;
}
nsIDocument* parentDocument = aParent->AsDocument();
nsIContent* docTypeContent = parentDocument->GetDoctype();
if (docTypeContent) {
// Already have a doctype, so this is only OK if we're replacing it
return aIsReplace && docTypeContent == aRefChild;
}
// We don't have a doctype yet. Our one remaining constraint is
// that the doctype must come before the documentElement.
Element* rootElement = parentDocument->GetRootElement();
if (!rootElement) {
// It's all good
return true;
}
if (!aRefChild) {
// Trying to append a doctype, but have a documentElement
return false;
}
int32_t rootIndex = aParent->ComputeIndexOf(rootElement);
int32_t insertIndex = aParent->ComputeIndexOf(aRefChild);
// Now we're OK if and only if insertIndex <= rootIndex. Indeed, either
// we end up replacing aRefChild or we end up before it. Either one is
// ok as long as aRefChild is not after rootElement.
return insertIndex <= rootIndex;
}
case nsINode::DOCUMENT_FRAGMENT_NODE :
{
// Note that for now we only allow nodes inside document fragments if
// they're allowed inside elements. If we ever change this to allow
// doctype nodes in document fragments, we'll need to update this code.
// Also, there's a version of this code in ReplaceOrInsertBefore. If you
// change this code, change that too.
if (!aParent->IsDocument()) {
// All good here
return true;
}
bool sawElement = false;
for (nsIContent* child = aNewChild->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child->IsElement()) {
if (sawElement) {
// Can't put two elements into a document
return false;
}
sawElement = true;
}
// If we can put this content at the the right place, we might be ok;
// if not, we bail out.
if (!IsAllowedAsChild(child, aParent, aIsReplace, aRefChild)) {
return false;
}
}
// Everything in the fragment checked out ok, so we can stick it in here
return true;
}
default:
/*
* aNewChild is of invalid type.
*/
break;
}
return false;
}
void
nsINode::EnsurePreInsertionValidity(nsINode& aNewChild, nsINode* aRefChild,
ErrorResult& aError)
{
EnsurePreInsertionValidity1(aNewChild, aRefChild, aError);
if (aError.Failed()) {
return;
}
EnsurePreInsertionValidity2(false, aNewChild, aRefChild, aError);
}
void
nsINode::EnsurePreInsertionValidity1(nsINode& aNewChild, nsINode* aRefChild,
ErrorResult& aError)
{
if ((!IsDocument() && !IsDocumentFragment() && !IsElement()) ||
!aNewChild.IsContent()) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return;
}
}
void
nsINode::EnsurePreInsertionValidity2(bool aReplace, nsINode& aNewChild,
nsINode* aRefChild, ErrorResult& aError)
{
nsIContent* newContent = aNewChild.AsContent();
if (newContent->IsRootOfAnonymousSubtree()) {
// This is anonymous content. Don't allow its insertion
// anywhere, since it might have UnbindFromTree calls coming
// its way.
aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
// Make sure that the inserted node is allowed as a child of its new parent.
if (!IsAllowedAsChild(newContent, this, aReplace, aRefChild)) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return;
}
}
nsINode*
nsINode::ReplaceOrInsertBefore(bool aReplace, nsINode* aNewChild,
nsINode* aRefChild, ErrorResult& aError)
{
// XXXbz I wish I could assert that nsContentUtils::IsSafeToRunScript() so we
// could rely on scriptblockers going out of scope to actually run XBL
// teardown, but various crud adds nodes under scriptblockers (e.g. native
// anonymous content). The only good news is those insertions can't trigger
// the bad XBL cases.
MOZ_ASSERT_IF(aReplace, aRefChild);
EnsurePreInsertionValidity1(*aNewChild, aRefChild, aError);
if (aError.Failed()) {
return nullptr;
}
uint16_t nodeType = aNewChild->NodeType();
// Before we do anything else, fire all DOMNodeRemoved mutation events
// We do this up front as to avoid having to deal with script running
// at random places further down.
// Scope firing mutation events so that we don't carry any state that
// might be stale
{
// This check happens again further down (though then using
// ComputeIndexOf).
// We're only checking this here to avoid firing mutation events when
// none should be fired.
// It's ok that we do the check twice in the case when firing mutation
// events as we need to recheck after running script anyway.
if (aRefChild && aRefChild->GetParentNode() != this) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
// If we're replacing, fire for node-to-be-replaced.
// If aRefChild == aNewChild then we'll fire for it in check below
if (aReplace && aRefChild != aNewChild) {
nsContentUtils::MaybeFireNodeRemoved(aRefChild, this);
}
// If the new node already has a parent, fire for removing from old
// parent
nsINode* oldParent = aNewChild->GetParentNode();
if (oldParent) {
nsContentUtils::MaybeFireNodeRemoved(aNewChild, oldParent);
}
// If we're inserting a fragment, fire for all the children of the
// fragment
if (nodeType == DOCUMENT_FRAGMENT_NODE) {
static_cast<FragmentOrElement*>(aNewChild)->FireNodeRemovedForChildren();
}
// Verify that our aRefChild is still sensible
if (aRefChild && aRefChild->GetParentNode() != this) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
}
EnsurePreInsertionValidity2(aReplace, *aNewChild, aRefChild, aError);
if (aError.Failed()) {
return nullptr;
}
// Record the node to insert before, if any
nsIContent* nodeToInsertBefore;
if (aReplace) {
nodeToInsertBefore = aRefChild->GetNextSibling();
} else {
// Since aRefChild is our child, it must be an nsIContent object.
nodeToInsertBefore = aRefChild ? aRefChild->AsContent() : nullptr;
}
if (nodeToInsertBefore == aNewChild) {
// We're going to remove aNewChild from its parent, so use its next sibling
// as the node to insert before.
nodeToInsertBefore = nodeToInsertBefore->GetNextSibling();
}
Maybe<AutoTArray<nsCOMPtr<nsIContent>, 50> > fragChildren;
// Remove the new child from the old parent if one exists
nsIContent* newContent = aNewChild->AsContent();
nsCOMPtr<nsINode> oldParent = newContent->GetParentNode();
if (oldParent) {
// Hold a strong ref to nodeToInsertBefore across the removal of newContent
nsCOMPtr<nsINode> kungFuDeathGrip = nodeToInsertBefore;
// Removing a child can run script, via XBL destructors.
nsMutationGuard guard;
// Scope for the mutation batch and scriptblocker, so they go away
// while kungFuDeathGrip is still alive.
{
mozAutoDocUpdate batch(newContent->GetComposedDoc(), true);
nsAutoMutationBatch mb(oldParent, true, true);
// ScriptBlocker ensures previous and next stay alive.
nsIContent* previous = aNewChild->GetPreviousSibling();
nsIContent* next = aNewChild->GetNextSibling();
oldParent->RemoveChildNode(aNewChild->AsContent(), true);
if (nsAutoMutationBatch::GetCurrentBatch() == &mb) {
mb.RemovalDone();
mb.SetPrevSibling(previous);
mb.SetNextSibling(next);
}
}
// We expect one mutation (the removal) to have happened.
if (guard.Mutated(1)) {
// XBL destructors, yuck.
// Verify that nodeToInsertBefore, if non-null, is still our child. If
// it's not, there's no way we can do this insert sanely; just bail out.
if (nodeToInsertBefore && nodeToInsertBefore->GetParent() != this) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
// Verify that newContent has no parent.
if (newContent->GetParentNode()) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
// And verify that newContent is still allowed as our child.
if (aNewChild == aRefChild) {
// We've already removed aRefChild. So even if we were doing a replace,
// now we're doing a simple insert before nodeToInsertBefore.
if (!IsAllowedAsChild(newContent, this, false, nodeToInsertBefore)) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
} else {
if ((aRefChild && aRefChild->GetParent() != this) ||
!IsAllowedAsChild(newContent, this, aReplace, aRefChild)) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
// And recompute nodeToInsertBefore, just in case.
if (aReplace) {
nodeToInsertBefore = aRefChild->GetNextSibling();
} else {
nodeToInsertBefore = aRefChild ? aRefChild->AsContent() : nullptr;
}
}
}
} else if (nodeType == DOCUMENT_FRAGMENT_NODE) {
// Make sure to remove all the fragment's kids. We need to do this before
// we start inserting anything, so we will run out XBL destructors and
// binding teardown (GOD, I HATE THESE THINGS) before we insert anything
// into the DOM.
uint32_t count = newContent->GetChildCount();
fragChildren.emplace();
// Copy the children into a separate array to avoid having to deal with
// mutations to the fragment later on here.
fragChildren->SetCapacity(count);
for (nsIContent* child = newContent->GetFirstChild();
child;
child = child->GetNextSibling()) {
NS_ASSERTION(child->GetComposedDoc() == nullptr,
"How did we get a child with a current doc?");
fragChildren->AppendElement(child);
}
// Hold a strong ref to nodeToInsertBefore across the removals
nsCOMPtr<nsINode> kungFuDeathGrip = nodeToInsertBefore;
nsMutationGuard guard;
// Scope for the mutation batch and scriptblocker, so they go away
// while kungFuDeathGrip is still alive.
{
mozAutoDocUpdate batch(newContent->GetComposedDoc(), true);
nsAutoMutationBatch mb(newContent, false, true);
while (newContent->HasChildren()) {
newContent->RemoveChildNode(newContent->GetLastChild(), true);
}
}
// We expect |count| removals
if (guard.Mutated(count)) {
// XBL destructors, yuck.
// Verify that nodeToInsertBefore, if non-null, is still our child. If
// it's not, there's no way we can do this insert sanely; just bail out.
if (nodeToInsertBefore && nodeToInsertBefore->GetParent() != this) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
// Verify that all the things in fragChildren have no parent.
for (uint32_t i = 0; i < count; ++i) {
if (fragChildren->ElementAt(i)->GetParentNode()) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
}
// Note that unlike the single-element case above, none of our kids can
// be aRefChild, so we can always pass through aReplace in the
// IsAllowedAsChild checks below and don't have to worry about whether
// recomputing nodeToInsertBefore is OK.
// Verify that our aRefChild is still sensible
if (aRefChild && aRefChild->GetParent() != this) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
// Recompute nodeToInsertBefore, just in case.
if (aReplace) {
nodeToInsertBefore = aRefChild->GetNextSibling();
} else {
// If aRefChild has 'this' as a parent, it must be an nsIContent.
nodeToInsertBefore = aRefChild ? aRefChild->AsContent() : nullptr;
}
// And verify that newContent is still allowed as our child. Sadly, we
// need to reimplement the relevant part of IsAllowedAsChild() because
// now our nodes are in an array and all. If you change this code,
// change the code there.
if (IsDocument()) {
bool sawElement = false;
for (uint32_t i = 0; i < count; ++i) {
nsIContent* child = fragChildren->ElementAt(i);
if (child->IsElement()) {
if (sawElement) {
// No good
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
sawElement = true;
}
if (!IsAllowedAsChild(child, this, aReplace, aRefChild)) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return nullptr;
}
}
}
}
}
mozAutoDocUpdate batch(GetComposedDoc(), true);
nsAutoMutationBatch mb;
// If we're replacing and we haven't removed aRefChild yet, do so now
if (aReplace && aRefChild != aNewChild) {
mb.Init(this, true, true);
// Since aRefChild is never null in the aReplace case, we know that at
// this point nodeToInsertBefore is the next sibling of aRefChild.
NS_ASSERTION(aRefChild->GetNextSibling() == nodeToInsertBefore,
"Unexpected nodeToInsertBefore");
nsIContent* toBeRemoved = nodeToInsertBefore ?
nodeToInsertBefore->GetPreviousSibling() : GetLastChild();
MOZ_ASSERT(toBeRemoved);
RemoveChildNode(toBeRemoved, true);
}
// Move new child over to our document if needed. Do this after removing
// it from its parent so that AdoptNode doesn't fire DOMNodeRemoved
// DocumentType nodes are the only nodes that can have a null
// ownerDocument according to the DOM spec, and we need to allow
// inserting them w/o calling AdoptNode().
nsIDocument* doc = OwnerDoc();
if (doc != newContent->OwnerDoc()) {
AdoptNodeIntoOwnerDoc(this, aNewChild, aError);
if (aError.Failed()) {
return nullptr;
}
} else if (doc->DidDocumentOpen()) {
CheckForOutdatedParent(this, aNewChild, aError);
if (aError.Failed()) {
return nullptr;
}
}
/*
* Check if we're inserting a document fragment. If we are, we need
* to actually add its children individually (i.e. we don't add the
* actual document fragment).
*/
nsINode* result = aReplace ? aRefChild : aNewChild;
if (nodeType == DOCUMENT_FRAGMENT_NODE) {
if (!aReplace) {
mb.Init(this, true, true);
}
nsAutoMutationBatch* mutationBatch = nsAutoMutationBatch::GetCurrentBatch();
if (mutationBatch) {
mutationBatch->RemovalDone();
mutationBatch->SetPrevSibling(nodeToInsertBefore ?
nodeToInsertBefore->GetPreviousSibling() : GetLastChild());
mutationBatch->SetNextSibling(nodeToInsertBefore);
}
uint32_t count = fragChildren->Length();
if (!count) {
return result;
}
bool appending = !IsDocument() && !nodeToInsertBefore;
nsIContent* firstInsertedContent = fragChildren->ElementAt(0);
// Iterate through the fragment's children, and insert them in the new
// parent
for (uint32_t i = 0; i < count; ++i) {
// XXXbz how come no reparenting here? That seems odd...
// Insert the child.
aError = InsertChildBefore(fragChildren->ElementAt(i), nodeToInsertBefore,
!appending);
if (aError.Failed()) {
// Make sure to notify on any children that we did succeed to insert
if (appending && i != 0) {
nsNodeUtils::ContentAppended(static_cast<nsIContent*>(this),
firstInsertedContent);
}
return nullptr;
}
}
if (mutationBatch && !appending) {
mutationBatch->NodesAdded();
}
// Notify and fire mutation events when appending
if (appending) {
nsNodeUtils::ContentAppended(static_cast<nsIContent*>(this),
firstInsertedContent);
if (mutationBatch) {
mutationBatch->NodesAdded();
}
// Optimize for the case when there are no listeners
if (nsContentUtils::
HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEINSERTED)) {
Element::FireNodeInserted(doc, this, *fragChildren);
}
}
}
else {
// Not inserting a fragment but rather a single node.
// FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=544654
// We need to reparent here for nodes for which the parent of their
// wrapper is not the wrapper for their ownerDocument (XUL elements,
// form controls, ...). Also applies in the fragment code above.
if (nsAutoMutationBatch::GetCurrentBatch() == &mb) {
mb.RemovalDone();
mb.SetPrevSibling(nodeToInsertBefore ?
nodeToInsertBefore->GetPreviousSibling() : GetLastChild());
mb.SetNextSibling(nodeToInsertBefore);
}
aError = InsertChildBefore(newContent, nodeToInsertBefore, true);
if (aError.Failed()) {
return nullptr;
}
}
return result;
}
void
nsINode::BindObject(nsISupports* aObject)
{
nsCOMArray<nsISupports>* objects =
static_cast<nsCOMArray<nsISupports>*>(GetProperty(nsGkAtoms::keepobjectsalive));
if (!objects) {
objects = new nsCOMArray<nsISupports>();
SetProperty(nsGkAtoms::keepobjectsalive, objects,
nsINode::DeleteProperty< nsCOMArray<nsISupports> >, true);
}
objects->AppendObject(aObject);
}
void
nsINode::UnbindObject(nsISupports* aObject)
{
nsCOMArray<nsISupports>* objects =
static_cast<nsCOMArray<nsISupports>*>(GetProperty(nsGkAtoms::keepobjectsalive));
if (objects) {
objects->RemoveObject(aObject);
}
}
already_AddRefed<AccessibleNode>
nsINode::GetAccessibleNode()
{
#ifdef ACCESSIBILITY
nsresult rv = NS_OK;
RefPtr<AccessibleNode> anode =
static_cast<AccessibleNode*>(GetProperty(nsGkAtoms::accessiblenode, &rv));
if (NS_FAILED(rv)) {
anode = new AccessibleNode(this);
RefPtr<AccessibleNode> temp = anode;
rv = SetProperty(nsGkAtoms::accessiblenode, temp.forget().take(),
nsPropertyTable::SupportsDtorFunc, true);
if (NS_FAILED(rv)) {
NS_WARNING("SetProperty failed");
return nullptr;
}
}
return anode.forget();
#else
return nullptr;
#endif
}
void
nsINode::AddSizeOfExcludingThis(nsWindowSizes& aSizes, size_t* aNodeSize) const
{
EventListenerManager* elm = GetExistingListenerManager();
if (elm) {
*aNodeSize += elm->SizeOfIncludingThis(aSizes.mState.mMallocSizeOf);
}
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mNodeInfo
// - mSlots
//
// The following members are not measured:
// - mParent, mNextSibling, mPreviousOrLastSibling, mFirstChild: because they're
// non-owning, from "exclusive ownership" point of view.
}
void
nsINode::AddSizeOfIncludingThis(nsWindowSizes& aSizes, size_t* aNodeSize) const
{
*aNodeSize += aSizes.mState.mMallocSizeOf(this);
AddSizeOfExcludingThis(aSizes, aNodeSize);
}
#define EVENT(name_, id_, type_, struct_) \
EventHandlerNonNull* nsINode::GetOn##name_() { \
EventListenerManager *elm = GetExistingListenerManager(); \
return elm ? elm->GetEventHandler(nsGkAtoms::on##name_) : nullptr; \
} \
void nsINode::SetOn##name_(EventHandlerNonNull* handler) \
{ \
EventListenerManager *elm = GetOrCreateListenerManager(); \
if (elm) { \
elm->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
bool
nsINode::Contains(const nsINode* aOther) const
{
if (aOther == this) {
return true;
}
if (!aOther ||
OwnerDoc() != aOther->OwnerDoc() ||
IsInUncomposedDoc() != aOther->IsInUncomposedDoc() ||
!aOther->IsContent() ||
!GetFirstChild()) {
return false;
}
const nsIContent* other = static_cast<const nsIContent*>(aOther);
if (this == OwnerDoc()) {
// document.contains(aOther) returns true if aOther is in the document,
// but is not in any anonymous subtree.
// IsInUncomposedDoc() check is done already before this.
return !other->IsInAnonymousSubtree();
}
if (!IsElement() && !IsDocumentFragment()) {
return false;
}
if (AsContent()->GetBindingParent() != other->GetBindingParent()) {
return false;
}
return nsContentUtils::ContentIsDescendantOf(other, this);
}
uint32_t
nsINode::Length() const
{
switch (NodeType()) {
case DOCUMENT_TYPE_NODE:
return 0;
case TEXT_NODE:
case CDATA_SECTION_NODE:
case PROCESSING_INSTRUCTION_NODE:
case COMMENT_NODE:
MOZ_ASSERT(IsContent());
return AsContent()->TextLength();
default:
return GetChildCount();
}
}
const RawServoSelectorList*
nsINode::ParseSelectorList(const nsAString& aSelectorString,
ErrorResult& aRv)
{
nsIDocument* doc = OwnerDoc();
nsIDocument::SelectorCache& cache = doc->GetSelectorCache();
nsIDocument::SelectorCache::SelectorList* list =
cache.GetList(aSelectorString);
if (list) {
if (!*list) {
// Invalid selector.
aRv.ThrowDOMException(NS_ERROR_DOM_SYNTAX_ERR,
NS_LITERAL_CSTRING("'") + NS_ConvertUTF16toUTF8(aSelectorString) +
NS_LITERAL_CSTRING("' is not a valid selector")
);
return nullptr;
}
return list->get();
}
NS_ConvertUTF16toUTF8 selectorString(aSelectorString);
auto selectorList =
UniquePtr<RawServoSelectorList>(Servo_SelectorList_Parse(&selectorString));
if (!selectorList) {
aRv.ThrowDOMException(NS_ERROR_DOM_SYNTAX_ERR,
NS_LITERAL_CSTRING("'") + selectorString +
NS_LITERAL_CSTRING("' is not a valid selector")
);
}
auto* ret = selectorList.get();
cache.CacheList(aSelectorString, std::move(selectorList));
return ret;
}
namespace {
struct SelectorMatchInfo {
};
} // namespace
// Given an id, find first element with that id under aRoot.
// If none found, return nullptr. aRoot must be in the document.
inline static Element*
FindMatchingElementWithId(const nsAString& aId, nsINode* aRoot)
{
MOZ_ASSERT(aRoot->IsInUncomposedDoc(),
"Don't call me if the root is not in the document");
// FIXME(emilio): It'd be nice to optimize this for shadow roots too.
MOZ_ASSERT(aRoot->IsElement() || aRoot->IsDocument(),
"The optimization below to check ContentIsDescendantOf only for "
"elements depends on aRoot being either an element or a "
"document if it's in the document. Note that document fragments "
"can't be IsInUncomposedDoc(), so should never show up here.");
const nsTArray<Element*>* elements = aRoot->OwnerDoc()->GetAllElementsForId(aId);
if (!elements) {
// Nothing to do; we're done
return nullptr;
}
// XXXbz: Should we fall back to the tree walk if aRoot is not the
// document and |elements| is long, for some value of "long"?
for (size_t i = 0; i < elements->Length(); ++i) {
Element* element = (*elements)[i];
if (!aRoot->IsElement() ||
(element != aRoot &&
nsContentUtils::ContentIsDescendantOf(element, aRoot))) {
// We have an element with the right id and it's a strict descendant
// of aRoot.
return element;
}
}
return nullptr;
}
Element*
nsINode::QuerySelector(const nsAString& aSelector, ErrorResult& aResult)
{
AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
"nsINode::QuerySelector", DOM, aSelector);
const RawServoSelectorList* list = ParseSelectorList(aSelector, aResult);
if (!list) {
return nullptr;
}
const bool useInvalidation = false;
return const_cast<Element*>(
Servo_SelectorList_QueryFirst(this, list, useInvalidation));
}
already_AddRefed<nsINodeList>
nsINode::QuerySelectorAll(const nsAString& aSelector, ErrorResult& aResult)
{
AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
"nsINode::QuerySelectorAll", DOM, aSelector);
RefPtr<nsSimpleContentList> contentList = new nsSimpleContentList(this);
const RawServoSelectorList* list = ParseSelectorList(aSelector, aResult);
if (!list) {
return contentList.forget();
}
const bool useInvalidation = false;
Servo_SelectorList_QueryAll(this, list, contentList.get(), useInvalidation);
return contentList.forget();
}
Element*
nsINode::GetElementById(const nsAString& aId)
{
MOZ_ASSERT(IsElement() || IsDocumentFragment(),
"Bogus this object for GetElementById call");
if (IsInUncomposedDoc()) {
return FindMatchingElementWithId(aId, this);
}
for (nsIContent* kid = GetFirstChild(); kid; kid = kid->GetNextNode(this)) {
if (!kid->IsElement()) {
continue;
}
nsAtom* id = kid->AsElement()->GetID();
if (id && id->Equals(aId)) {
return kid->AsElement();
}
}
return nullptr;
}
JSObject*
nsINode::WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
{
// Make sure one of these is true
// (1) our owner document has a script handling object,
// (2) Our owner document has had a script handling object, or has been marked
// to have had one,
// (3) we are running a privileged script.
// Event handling is possible only if (1). If (2) event handling is
// prevented.
// If the document has never had a script handling object, untrusted
// scripts (3) shouldn't touch it!
bool hasHadScriptHandlingObject = false;
if (!OwnerDoc()->GetScriptHandlingObject(hasHadScriptHandlingObject) &&
!hasHadScriptHandlingObject &&
!nsContentUtils::IsSystemCaller(aCx)) {
Throw(aCx, NS_ERROR_UNEXPECTED);
return nullptr;
}
JS::Rooted<JSObject*> obj(aCx, WrapNode(aCx, aGivenProto));
MOZ_ASSERT_IF(obj && ChromeOnlyAccess(),
xpc::IsInContentXBLScope(obj) ||
!xpc::UseContentXBLScope(JS::GetObjectRealmOrNull(obj)));
return obj;
}
already_AddRefed<nsINode>
nsINode::CloneNode(bool aDeep, ErrorResult& aError)
{
return nsNodeUtils::CloneNodeImpl(this, aDeep, aError);
}
nsDOMAttributeMap*
nsINode::GetAttributes()
{
if (!IsElement()) {
return nullptr;
}
return AsElement()->Attributes();
}
Element*
nsINode::GetParentElementCrossingShadowRoot() const
{
if (!mParent) {
return nullptr;
}
if (mParent->IsElement()) {
return mParent->AsElement();
}
if (ShadowRoot* shadowRoot = ShadowRoot::FromNode(mParent)) {
MOZ_ASSERT(shadowRoot->GetHost(), "ShowRoots should always have a host");
return shadowRoot->GetHost();
}
return nullptr;
}
bool
nsINode::HasBoxQuadsSupport(JSContext* aCx, JSObject* /* unused */)
{
return xpc::AccessCheck::isChrome(js::GetContextCompartment(aCx)) ||
nsContentUtils::GetBoxQuadsEnabled();
}
nsINode*
nsINode::GetScopeChainParent() const
{
return nullptr;
}
void
nsINode::AddAnimationObserver(nsIAnimationObserver* aAnimationObserver)
{
AddMutationObserver(aAnimationObserver);
OwnerDoc()->SetMayHaveAnimationObservers();
}
void
nsINode::AddAnimationObserverUnlessExists(
nsIAnimationObserver* aAnimationObserver)
{
AddMutationObserverUnlessExists(aAnimationObserver);
OwnerDoc()->SetMayHaveAnimationObservers();
}
void
nsINode::GenerateXPath(nsAString& aResult)
{
XPathGenerator::Generate(this, aResult);
}
bool
nsINode::IsApzAware() const
{
return IsNodeApzAware();
}
bool
nsINode::IsNodeApzAwareInternal() const
{
return EventTarget::IsApzAware();
}
DocGroup*
nsINode::GetDocGroup() const
{
return OwnerDoc()->GetDocGroup();
}
class LocalizationHandler : public PromiseNativeHandler
{
public:
LocalizationHandler() = default;
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(LocalizationHandler)
nsTArray<nsCOMPtr<Element>>& Elements() { return mElements; }
void SetReturnValuePromise(Promise* aReturnValuePromise)
{
mReturnValuePromise = aReturnValuePromise;
}
virtual void
ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override
{
nsTArray<L10nValue> l10nData;
if (aValue.isObject()) {
JS::ForOfIterator iter(aCx);
if (!iter.init(aValue, JS::ForOfIterator::AllowNonIterable)) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
if (!iter.valueIsIterable()) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
JS::Rooted<JS::Value> temp(aCx);
while (true) {
bool done;
if (!iter.next(&temp, &done)) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
if (done) {
break;
}
L10nValue* slotPtr =
l10nData.AppendElement(mozilla::fallible);
if (!slotPtr) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
if (!slotPtr->Init(aCx, temp)) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
}
}
if (mElements.Length() != l10nData.Length()) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
JS::Rooted<JSObject*> untranslatedElements(aCx,
JS_NewArrayObject(aCx, mElements.Length()));
if (!untranslatedElements) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
ErrorResult rv;
for (size_t i = 0; i < l10nData.Length(); ++i) {
Element* elem = mElements[i];
nsString& content = l10nData[i].mValue;
if (!content.IsVoid()) {
elem->SetTextContent(content, rv);
if (NS_WARN_IF(rv.Failed())) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
}
Nullable<Sequence<AttributeNameValue>>& attributes =
l10nData[i].mAttributes;
if (!attributes.IsNull()) {
for (size_t j = 0; j < attributes.Value().Length(); ++j) {
// Use SetAttribute here to validate the attribute name!
elem->SetAttribute(attributes.Value()[j].mName,
attributes.Value()[j].mValue,
rv);
if (rv.Failed()) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
}
}
if (content.IsVoid() && attributes.IsNull()) {
JS::Rooted<JS::Value> wrappedElem(aCx);
if (!ToJSValue(aCx, elem, &wrappedElem)) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
if (!JS_DefineElement(aCx, untranslatedElements, i, wrappedElem, JSPROP_ENUMERATE)) {
mReturnValuePromise->MaybeRejectWithUndefined();
return;
}
}
}
mReturnValuePromise->MaybeResolve(untranslatedElements);
}
virtual void
RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue) override
{
mReturnValuePromise->MaybeRejectWithUndefined();
}
private:
~LocalizationHandler() = default;
nsTArray<nsCOMPtr<Element>> mElements;
RefPtr<Promise> mReturnValuePromise;
};
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LocalizationHandler)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_CLASS(LocalizationHandler)
NS_IMPL_CYCLE_COLLECTING_ADDREF(LocalizationHandler)
NS_IMPL_CYCLE_COLLECTING_RELEASE(LocalizationHandler)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(LocalizationHandler)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mElements)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mReturnValuePromise)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(LocalizationHandler)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElements)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReturnValuePromise)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
already_AddRefed<Promise>
nsINode::Localize(JSContext* aCx,
mozilla::dom::L10nCallback& aCallback,
mozilla::ErrorResult& aRv)
{
Sequence<L10nElement> l10nElements;
SequenceRooter<L10nElement> rooter(aCx, &l10nElements);
RefPtr<LocalizationHandler> nativeHandler = new LocalizationHandler();
nsTArray<nsCOMPtr<Element>>& domElements = nativeHandler->Elements();
nsIContent* node = IsContent() ? AsContent() : GetFirstChild();
nsAutoString l10nId;
nsAutoString l10nArgs;
nsAutoString l10nAttrs;
nsAutoString type;
for (; node; node = node->GetNextNode(this)) {
if (!node->IsElement()) {
continue;
}
Element* domElement = node->AsElement();
if (!domElement->GetAttr(kNameSpaceID_None, nsGkAtoms::datal10nid, l10nId)) {
continue;
}
domElement->GetAttr(kNameSpaceID_None, nsGkAtoms::datal10nargs, l10nArgs);
domElement->GetAttr(kNameSpaceID_None, nsGkAtoms::datal10nattrs, l10nAttrs);
L10nElement* element = l10nElements.AppendElement(fallible);
if (!element) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
if (!domElements.AppendElement(domElement, fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
domElement->GetNamespaceURI(element->mNamespaceURI);
element->mLocalName = domElement->LocalName();
domElement->GetAttr(kNameSpaceID_None, nsGkAtoms::type, type);
if (!type.IsEmpty()) {
element->mType = type;
}
element->mL10nId = l10nId;
if (!l10nAttrs.IsEmpty()) {
element->mL10nAttrs = l10nAttrs;
}
if (!l10nArgs.IsEmpty()) {
JS::Rooted<JS::Value> json(aCx);
if (!JS_ParseJSON(aCx, l10nArgs.get(), l10nArgs.Length(), &json) ||
!json.isObject()) {
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return nullptr;
}
element->mL10nArgs = &json.toObject();
}
}
RefPtr<Promise> callbackResult = aCallback.Call(l10nElements, aRv);
if (aRv.Failed()) {
return nullptr;
}
RefPtr<Promise> promise = Promise::Create(OwnerDoc()->GetParentObject(), aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
nativeHandler->SetReturnValuePromise(promise);
callbackResult->AppendNativeHandler(nativeHandler);
return promise.forget();
}
nsINode*
nsINode::GetFlattenedTreeParentNodeNonInline() const
{
return GetFlattenedTreeParentNode();
}
NS_IMPL_ISUPPORTS(nsNodeWeakReference,
nsIWeakReference)
nsNodeWeakReference::nsNodeWeakReference(nsINode* aNode)
: nsIWeakReference(aNode)
{
}
nsNodeWeakReference::~nsNodeWeakReference()
{
nsINode* node = static_cast<nsINode*>(mObject);
if (node) {
NS_ASSERTION(node->Slots()->mWeakReference == this,
"Weak reference has wrong value");
node->Slots()->mWeakReference = nullptr;
}
}
NS_IMETHODIMP
nsNodeWeakReference::QueryReferentFromScript(const nsIID& aIID, void** aInstancePtr)
{
return QueryReferent(aIID, aInstancePtr);
}
size_t
nsNodeWeakReference::SizeOfOnlyThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return aMallocSizeOf(this);
}
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