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gecko/dom/base/nsINode.cpp
Wes Kocher 554446ac26 Backed out 6 changesets (bug 1088228) for static analysis bustage 
Backed out changeset 13ecff800114 (bug 1088228)
Backed out changeset de692c3335f2 (bug 1088228)
Backed out changeset 2d449a2b4e1c (bug 1088228)
Backed out changeset 49ac8f33ab70 (bug 1088228)
Backed out changeset 920d50e84a17 (bug 1088228)
Backed out changeset 55f4818378e4 (bug 1088228)
2014-10-30 16:24:02 -07:00

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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 "mozAutoDocUpdate.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/CORSMode.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/Likely.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/ShadowRoot.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 "nsIAtom.h"
#include "nsIBaseWindow.h"
#include "nsICategoryManager.h"
#include "nsIContentIterator.h"
#include "nsIControllers.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIDOMDocumentType.h"
#include "nsIDOMEvent.h"
#include "nsIDOMEventListener.h"
#include "nsIDOMMutationEvent.h"
#include "nsIDOMNodeList.h"
#include "nsIEditor.h"
#include "nsIEditorIMESupport.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 "nsNetUtil.h"
#include "nsNodeInfoManager.h"
#include "nsNodeUtils.h"
#include "nsPIBoxObject.h"
#include "nsPIDOMWindow.h"
#include "nsPresContext.h"
#include "nsRuleProcessorData.h"
#include "nsString.h"
#include "nsStyleConsts.h"
#include "nsSVGFeatures.h"
#include "nsSVGUtils.h"
#include "nsTextNode.h"
#include "nsUnicharUtils.h"
#include "nsXBLBinding.h"
#include "nsXBLPrototypeBinding.h"
#include "mozilla/Preferences.h"
#include "prprf.h"
#include "xpcpublic.h"
#include "nsCSSRuleProcessor.h"
#include "nsCSSParser.h"
#include "HTMLLegendElement.h"
#include "nsWrapperCacheInlines.h"
#include "WrapperFactory.h"
#include "DocumentType.h"
#include <algorithm>
#include "nsGlobalWindow.h"
#include "nsDOMMutationObserver.h"
#include "GeometryUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
nsINode::nsSlots::~nsSlots()
{
if (mChildNodes) {
mChildNodes->DropReference();
NS_RELEASE(mChildNodes);
}
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();
NS_RELEASE(mChildNodes);
}
}
//----------------------------------------------------------------------
nsINode::~nsINode()
{
MOZ_ASSERT(!HasSlots(), "nsNodeUtils::LastRelease was not called?");
MOZ_ASSERT(mSubtreeRoot == this, "Didn't restore state properly?");
}
void*
nsINode::GetProperty(uint16_t aCategory, nsIAtom *aPropertyName,
nsresult *aStatus) const
{
return OwnerDoc()->PropertyTable(aCategory)->GetProperty(this, aPropertyName,
aStatus);
}
nsresult
nsINode::SetProperty(uint16_t aCategory, nsIAtom *aPropertyName, void *aValue,
NSPropertyDtorFunc aDtor, bool aTransfer,
void **aOldValue)
{
nsresult rv = OwnerDoc()->PropertyTable(aCategory)->SetProperty(this,
aPropertyName,
aValue, aDtor,
nullptr,
aTransfer,
aOldValue);
if (NS_SUCCEEDED(rv)) {
SetFlags(NODE_HAS_PROPERTIES);
}
return rv;
}
void
nsINode::DeleteProperty(uint16_t aCategory, nsIAtom *aPropertyName)
{
OwnerDoc()->PropertyTable(aCategory)->DeleteProperty(this, aPropertyName);
}
void*
nsINode::UnsetProperty(uint16_t aCategory, nsIAtom *aPropertyName,
nsresult *aStatus)
{
return OwnerDoc()->PropertyTable(aCategory)->UnsetProperty(this,
aPropertyName,
aStatus);
}
nsINode::nsSlots*
nsINode::CreateSlots()
{
return new nsSlots();
}
bool
nsINode::IsEditableInternal() const
{
if (HasFlag(NODE_IS_EDITABLE)) {
// The node is in an editable contentEditable subtree.
return true;
}
nsIDocument *doc = GetUncomposedDoc();
// Check if the node is in a document and the document is in designMode.
return doc && doc->HasFlag(NODE_IS_EDITABLE);
}
static nsIContent* GetEditorRootContent(nsIEditor* aEditor)
{
nsCOMPtr<nsIDOMElement> rootElement;
aEditor->GetRootElement(getter_AddRefs(rootElement));
nsCOMPtr<nsIContent> rootContent(do_QueryInterface(rootElement));
return rootContent;
}
nsIContent*
nsINode::GetTextEditorRootContent(nsIEditor** aEditor)
{
if (aEditor)
*aEditor = nullptr;
for (nsINode* node = this; node; node = node->GetParentNode()) {
if (!node->IsElement() ||
!node->AsElement()->IsHTML())
continue;
nsCOMPtr<nsIEditor> editor =
static_cast<nsGenericHTMLElement*>(node)->GetEditorInternal();
if (!editor)
continue;
nsIContent* rootContent = GetEditorRootContent(editor);
if (aEditor)
editor.swap(*aEditor);
return rootContent;
}
return nullptr;
}
nsINode*
nsINode::SubtreeRoot() const
{
// 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. nsIAttribute nodes - Are never in the document, and mSubtreeRoot
// is always 'this' (as set in nsINode's ctor).
nsINode* node;
if (IsInDoc()) {
node = OwnerDocAsNode();
} else if (IsContent()) {
ShadowRoot* containingShadow = AsContent()->GetContainingShadow();
node = containingShadow ? containingShadow : mSubtreeRoot;
} else {
node = mSubtreeRoot;
}
NS_ASSERTION(node, "Should always have a node here!");
#ifdef DEBUG
{
const nsINode* slowNode = this;
const nsINode* iter = slowNode;
while ((iter = iter->GetParentNode())) {
slowNode = iter;
}
NS_ASSERTION(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 (IsNodeOfType(eDOCUMENT))
return static_cast<nsIDocument*>(this)->GetRootElement();
if (!IsNodeOfType(eCONTENT))
return nullptr;
if (GetCrossShadowCurrentDoc() != 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) {
nsIEditor* editor = nsContentUtils::GetHTMLEditor(presContext);
if (editor) {
// This node is in HTML editor.
nsIDocument* doc = GetCrossShadowCurrentDoc();
if (!doc || doc->HasFlag(NODE_IS_EDITABLE) ||
!HasFlag(NODE_IS_EDITABLE)) {
nsIContent* editorRoot = GetEditorRootContent(editor);
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();
}
}
nsRefPtr<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.
ShadowRoot* shadowRoot = ShadowRoot::FromNode(content);
if (shadowRoot) {
content = shadowRoot->GetHost();
}
}
return content;
}
nsINodeList*
nsINode::ChildNodes()
{
nsSlots* slots = Slots();
if (!slots->mChildNodes) {
slots->mChildNodes = new nsChildContentList(this);
if (slots->mChildNodes) {
NS_ADDREF(slots->mChildNodes);
}
}
return slots->mChildNodes;
}
void
nsINode::GetTextContentInternal(nsAString& aTextContent, ErrorResult& aError)
{
SetDOMStringToNull(aTextContent);
}
nsIDocument*
nsINode::GetComposedDocInternal() const
{
MOZ_ASSERT(HasFlag(NODE_IS_IN_SHADOW_TREE) && IsContent(),
"Should only be caled on nodes in the shadow tree.");
// Cross ShadowRoot boundary.
ShadowRoot* containingShadow = AsContent()->GetContainingShadow();
nsIContent* poolHost = containingShadow->GetPoolHost();
if (!poolHost) {
// This node is in an older shadow root that does not get projected into
// an insertion point, thus this node can not be in the composed document.
return nullptr;
}
return poolHost->GetComposedDoc();
}
#ifdef DEBUG
void
nsINode::CheckNotNativeAnonymous() const
{
if (!IsNodeOfType(eCONTENT))
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();
}
bool
nsINode::IsAnonymousContentInSVGUseSubtree() const
{
MOZ_ASSERT(IsInAnonymousSubtree());
nsIContent* parent = AsContent()->GetBindingParent();
// Watch out for parentless native-anonymous subtrees.
return parent && parent->IsSVG(nsGkAtoms::use);
}
nsresult
nsINode::GetParentNode(nsIDOMNode** aParentNode)
{
*aParentNode = nullptr;
nsINode *parent = GetParentNode();
return parent ? CallQueryInterface(parent, aParentNode) : NS_OK;
}
nsresult
nsINode::GetParentElement(nsIDOMElement** aParentElement)
{
*aParentElement = nullptr;
nsINode* parent = GetParentElement();
return parent ? CallQueryInterface(parent, aParentElement) : NS_OK;
}
nsresult
nsINode::GetChildNodes(nsIDOMNodeList** aChildNodes)
{
NS_ADDREF(*aChildNodes = ChildNodes());
return NS_OK;
}
nsresult
nsINode::GetFirstChild(nsIDOMNode** aNode)
{
nsIContent* child = GetFirstChild();
if (child) {
return CallQueryInterface(child, aNode);
}
*aNode = nullptr;
return NS_OK;
}
nsresult
nsINode::GetLastChild(nsIDOMNode** aNode)
{
nsIContent* child = GetLastChild();
if (child) {
return CallQueryInterface(child, aNode);
}
*aNode = nullptr;
return NS_OK;
}
nsresult
nsINode::GetPreviousSibling(nsIDOMNode** aPrevSibling)
{
*aPrevSibling = nullptr;
nsIContent *sibling = GetPreviousSibling();
return sibling ? CallQueryInterface(sibling, aPrevSibling) : NS_OK;
}
nsresult
nsINode::GetNextSibling(nsIDOMNode** aNextSibling)
{
*aNextSibling = nullptr;
nsIContent *sibling = GetNextSibling();
return sibling ? CallQueryInterface(sibling, aNextSibling) : NS_OK;
}
nsresult
nsINode::GetOwnerDocument(nsIDOMDocument** aOwnerDocument)
{
*aOwnerDocument = nullptr;
nsIDocument *ownerDoc = GetOwnerDocument();
return ownerDoc ? CallQueryInterface(ownerDoc, aOwnerDocument) : NS_OK;
}
void
nsINode::GetNodeValueInternal(nsAString& aNodeValue)
{
SetDOMStringToNull(aNodeValue);
}
nsINode*
nsINode::RemoveChild(nsINode& aOldChild, ErrorResult& aError)
{
if (IsNodeOfType(eDATA_NODE)) {
// 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, OwnerDoc());
}
int32_t index = IndexOf(&aOldChild);
if (index == -1) {
// aOldChild isn't one of our children.
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
RemoveChildAt(index, true);
return &aOldChild;
}
nsresult
nsINode::RemoveChild(nsIDOMNode* aOldChild, nsIDOMNode** aReturn)
{
nsCOMPtr<nsINode> oldChild = do_QueryInterface(aOldChild);
if (!oldChild) {
return NS_ERROR_NULL_POINTER;
}
ErrorResult rv;
RemoveChild(*oldChild, rv);
if (!rv.Failed()) {
NS_ADDREF(*aReturn = aOldChild);
}
return rv.ErrorCode();
}
void
nsINode::Normalize()
{
// First collect list of nodes to be removed
nsAutoTArray<nsCOMPtr<nsIContent>, 50> nodes;
bool canMerge = false;
for (nsIContent* node = this->GetFirstChild();
node;
node = node->GetNextNode(this)) {
if (node->NodeType() != nsIDOMNode::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,
doc);
}
}
}
mozAutoDocUpdate batch(doc, UPDATE_CONTENT_MODEL, 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() == nsIDOMNode::TEXT_NODE) ||
hasRemoveListeners,
"Should always have a previous text sibling unless "
"mutation events messed us up");
if (!hasRemoveListeners ||
(target && target->NodeType() == nsIDOMNode::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->RemoveChildAt(parent->IndexOf(node), true);
}
}
}
void
nsINode::GetBaseURI(nsAString &aURI) const
{
nsCOMPtr<nsIURI> baseURI = GetBaseURI();
nsAutoCString spec;
if (baseURI) {
baseURI->GetSpec(spec);
}
CopyUTF8toUTF16(spec, aURI);
}
void
nsINode::GetBaseURIFromJS(nsAString& aURI) const
{
nsCOMPtr<nsIURI> baseURI = GetBaseURI(nsContentUtils::IsCallerChrome());
nsAutoCString spec;
if (baseURI) {
baseURI->GetSpec(spec);
}
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()) {
uint32_t attrCount = content->GetAttrCount();
for (uint32_t i = 0; i < attrCount; ++i) {
const nsAttrName* name = content->GetAttrNameAt(i);
if (name->NamespaceEquals(kNameSpaceID_XMLNS) &&
content->AttrValueIs(kNameSpaceID_XMLNS, name->LocalName(),
aNamespaceURI, eCaseMatters)) {
// If the localName is "xmlns", the prefix we output should be
// null.
nsIAtom *localName = name->LocalName();
if (localName != nsGkAtoms::xmlns) {
localName->ToString(aPrefix);
}
else {
SetDOMStringToNull(aPrefix);
}
return;
}
}
}
}
SetDOMStringToNull(aPrefix);
}
static nsresult
SetUserDataProperty(uint16_t aCategory, nsINode *aNode, nsIAtom *aKey,
nsISupports* aValue, void** aOldValue)
{
nsresult rv = aNode->SetProperty(aCategory, aKey, aValue,
nsPropertyTable::SupportsDtorFunc, true,
aOldValue);
NS_ENSURE_SUCCESS(rv, rv);
// Property table owns it now.
NS_ADDREF(aValue);
return NS_OK;
}
nsresult
nsINode::SetUserData(const nsAString &aKey, nsIVariant *aData, nsIVariant **aResult)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eGetSetUserData);
*aResult = nullptr;
nsCOMPtr<nsIAtom> key = do_GetAtom(aKey);
if (!key) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsresult rv;
void *data;
if (aData) {
rv = SetUserDataProperty(DOM_USER_DATA, this, key, aData, &data);
NS_ENSURE_SUCCESS(rv, rv);
}
else {
data = UnsetProperty(DOM_USER_DATA, key);
}
// Take over ownership of the old data from the property table.
nsCOMPtr<nsIVariant> oldData = dont_AddRef(static_cast<nsIVariant*>(data));
oldData.swap(*aResult);
return NS_OK;
}
void
nsINode::SetUserData(JSContext* aCx, const nsAString& aKey,
JS::Handle<JS::Value> aData,
JS::MutableHandle<JS::Value> aRetval,
ErrorResult& aError)
{
nsCOMPtr<nsIVariant> data;
aError = nsContentUtils::XPConnect()->JSValToVariant(aCx, aData, getter_AddRefs(data));
if (aError.Failed()) {
return;
}
nsCOMPtr<nsIVariant> oldData;
aError = SetUserData(aKey, data, getter_AddRefs(oldData));
if (aError.Failed()) {
return;
}
if (!oldData) {
aRetval.setNull();
return;
}
JSAutoCompartment ac(aCx, GetWrapper());
aError = nsContentUtils::XPConnect()->VariantToJS(aCx, GetWrapper(), oldData,
aRetval);
}
nsIVariant*
nsINode::GetUserData(const nsAString& aKey)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eGetSetUserData);
nsCOMPtr<nsIAtom> key = do_GetAtom(aKey);
if (!key) {
return nullptr;
}
return static_cast<nsIVariant*>(GetProperty(DOM_USER_DATA, key));
}
void
nsINode::GetUserData(JSContext* aCx, const nsAString& aKey,
JS::MutableHandle<JS::Value> aRetval, ErrorResult& aError)
{
nsIVariant* data = GetUserData(aKey);
if (!data) {
aRetval.setNull();
return;
}
JSAutoCompartment ac(aCx, GetWrapper());
aError = nsContentUtils::XPConnect()->VariantToJS(aCx, GetWrapper(), data,
aRetval);
}
uint16_t
nsINode::CompareDocumentPosition(nsINode& aOtherNode) const
{
if (this == &aOtherNode) {
return 0;
}
if (GetPreviousSibling() == &aOtherNode) {
MOZ_ASSERT(GetParentNode() == aOtherNode.GetParentNode());
return static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_PRECEDING);
}
if (GetNextSibling() == &aOtherNode) {
MOZ_ASSERT(GetParentNode() == aOtherNode.GetParentNode());
return static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_FOLLOWING);
}
nsAutoTArray<const nsINode*, 32> parents1, parents2;
const nsINode *node1 = &aOtherNode, *node2 = this;
// Check if either node is an attribute
const Attr* attr1 = nullptr;
if (node1->IsNodeOfType(nsINode::eATTRIBUTE)) {
attr1 = static_cast<const Attr*>(node1);
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 (node2->IsNodeOfType(nsINode::eATTRIBUTE)) {
const Attr* attr2 = static_cast<const Attr*>(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 nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |
nsIDOMNode::DOCUMENT_POSITION_PRECEDING;
}
if (attrName->Equals(attr2->NodeInfo())) {
return nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC |
nsIDOMNode::DOCUMENT_POSITION_FOLLOWING;
}
}
NS_NOTREACHED("neither attribute in the element");
return nsIDOMNode::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 ?
(nsIDOMNode::DOCUMENT_POSITION_PRECEDING |
nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED |
nsIDOMNode::DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC) :
(nsIDOMNode::DOCUMENT_POSITION_FOLLOWING |
nsIDOMNode::DOCUMENT_POSITION_DISCONNECTED |
nsIDOMNode::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
// IndexOf will return -1 for the attribute making the attribute be
// considered before any child.
return parent->IndexOf(child1) < parent->IndexOf(child2) ?
static_cast<uint16_t>(nsIDOMNode::DOCUMENT_POSITION_PRECEDING) :
static_cast<uint16_t>(nsIDOMNode::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 ?
(nsIDOMNode::DOCUMENT_POSITION_PRECEDING |
nsIDOMNode::DOCUMENT_POSITION_CONTAINS) :
(nsIDOMNode::DOCUMENT_POSITION_FOLLOWING |
nsIDOMNode::DOCUMENT_POSITION_CONTAINED_BY);
}
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 nsIDOMNode::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 nsIDOMNode::TEXT_NODE:
case nsIDOMNode::COMMENT_NODE:
case nsIDOMNode::CDATA_SECTION_NODE:
case nsIDOMNode::PROCESSING_INSTRUCTION_NODE:
{
string1.Truncate();
static_cast<nsIContent*>(node1)->AppendTextTo(string1);
string2.Truncate();
static_cast<nsIContent*>(node2)->AppendTextTo(string2);
if (!string1.Equals(string2)) {
return false;
}
break;
}
case nsIDOMNode::DOCUMENT_NODE:
case nsIDOMNode::DOCUMENT_FRAGMENT_NODE:
break;
case nsIDOMNode::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 nsIDOMNode::DOCUMENT_TYPE_NODE:
{
nsCOMPtr<nsIDOMDocumentType> docType1 = do_QueryInterface(node1);
nsCOMPtr<nsIDOMDocumentType> docType2 = do_QueryInterface(node2);
NS_ASSERTION(docType1 && docType2, "Why don't we have a document type node?");
// 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;
}
// Internal subset
docType1->GetInternalSubset(string1);
docType2->GetInternalSubset(string2);
if (!string1.Equals(string2)) {
return false;
}
break;
}
default:
NS_ABORT_IF_FALSE(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);
}
}
NS_IMPL_DOMTARGET_DEFAULTS(nsINode)
NS_IMETHODIMP
nsINode::AddEventListener(const nsAString& aType,
nsIDOMEventListener *aListener,
bool aUseCapture,
bool aWantsUntrusted,
uint8_t aOptionalArgc)
{
NS_ASSERTION(!aWantsUntrusted || aOptionalArgc > 1,
"Won't check if this is chrome, you want to set "
"aWantsUntrusted to false or make the aWantsUntrusted "
"explicit by making aOptionalArgc non-zero.");
if (!aWantsUntrusted &&
(aOptionalArgc < 2 &&
!nsContentUtils::IsChromeDoc(OwnerDoc()))) {
aWantsUntrusted = true;
}
EventListenerManager* listener_manager = GetOrCreateListenerManager();
NS_ENSURE_STATE(listener_manager);
listener_manager->AddEventListener(aType, aListener, aUseCapture,
aWantsUntrusted);
return NS_OK;
}
void
nsINode::AddEventListener(const nsAString& aType,
EventListener* aListener,
bool aUseCapture,
const Nullable<bool>& aWantsUntrusted,
ErrorResult& aRv)
{
bool wantsUntrusted;
if (aWantsUntrusted.IsNull()) {
wantsUntrusted = !nsContentUtils::IsChromeDoc(OwnerDoc());
} else {
wantsUntrusted = aWantsUntrusted.Value();
}
EventListenerManager* listener_manager = GetOrCreateListenerManager();
if (!listener_manager) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return;
}
listener_manager->AddEventListener(aType, aListener, aUseCapture,
wantsUntrusted);
}
NS_IMETHODIMP
nsINode::AddSystemEventListener(const nsAString& aType,
nsIDOMEventListener *aListener,
bool aUseCapture,
bool aWantsUntrusted,
uint8_t aOptionalArgc)
{
NS_ASSERTION(!aWantsUntrusted || aOptionalArgc > 1,
"Won't check if this is chrome, you want to set "
"aWantsUntrusted to false or make the aWantsUntrusted "
"explicit by making aOptionalArgc non-zero.");
if (!aWantsUntrusted &&
(aOptionalArgc < 2 &&
!nsContentUtils::IsChromeDoc(OwnerDoc()))) {
aWantsUntrusted = true;
}
return NS_AddSystemEventListener(this, aType, aListener, aUseCapture,
aWantsUntrusted);
}
NS_IMETHODIMP
nsINode::RemoveEventListener(const nsAString& aType,
nsIDOMEventListener* aListener,
bool aUseCapture)
{
EventListenerManager* elm = GetExistingListenerManager();
if (elm) {
elm->RemoveEventListener(aType, aListener, aUseCapture);
}
return NS_OK;
}
NS_IMPL_REMOVE_SYSTEM_EVENT_LISTENER(nsINode)
nsresult
nsINode::PreHandleEvent(EventChainPreVisitor& aVisitor)
{
// This is only here so that we can use the NS_DECL_NSIDOMTARGET macro
NS_ABORT();
return NS_ERROR_NOT_IMPLEMENTED;
}
void
nsINode::GetBoxQuads(const BoxQuadOptions& aOptions,
nsTArray<nsRefPtr<DOMQuad> >& aResult,
mozilla::ErrorResult& aRv)
{
mozilla::GetBoxQuads(this, aOptions, aResult, aRv);
}
already_AddRefed<DOMQuad>
nsINode::ConvertQuadFromNode(DOMQuad& aQuad,
const GeometryNode& aFrom,
const ConvertCoordinateOptions& aOptions,
ErrorResult& aRv)
{
return mozilla::ConvertQuadFromNode(this, aQuad, aFrom, aOptions, aRv);
}
already_AddRefed<DOMQuad>
nsINode::ConvertRectFromNode(DOMRectReadOnly& aRect,
const GeometryNode& aFrom,
const ConvertCoordinateOptions& aOptions,
ErrorResult& aRv)
{
return mozilla::ConvertRectFromNode(this, aRect, aFrom, aOptions, aRv);
}
already_AddRefed<DOMPoint>
nsINode::ConvertPointFromNode(const DOMPointInit& aPoint,
const GeometryNode& aFrom,
const ConvertCoordinateOptions& aOptions,
ErrorResult& aRv)
{
return mozilla::ConvertPointFromNode(this, aPoint, aFrom, aOptions, aRv);
}
nsresult
nsINode::DispatchEvent(nsIDOMEvent *aEvent, bool* aRetVal)
{
// 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) {
*aRetVal = true;
return NS_OK;
}
// Obtain a presentation shell
nsIPresShell *shell = document->GetShell();
nsRefPtr<nsPresContext> context;
if (shell) {
context = shell->GetPresContext();
}
nsEventStatus status = nsEventStatus_eIgnore;
nsresult rv =
EventDispatcher::DispatchDOMEvent(this, nullptr, aEvent, context, &status);
*aRetVal = (status != nsEventStatus_eConsumeNoDefault);
return rv;
}
nsresult
nsINode::PostHandleEvent(EventChainPostVisitor& /*aVisitor*/)
{
return NS_OK;
}
nsresult
nsINode::DispatchDOMEvent(WidgetEvent* aEvent,
nsIDOMEvent* aDOMEvent,
nsPresContext* aPresContext,
nsEventStatus* aEventStatus)
{
return EventDispatcher::DispatchDOMEvent(this, aEvent, aDOMEvent,
aPresContext, aEventStatus);
}
EventListenerManager*
nsINode::GetOrCreateListenerManager()
{
return nsContentUtils::GetListenerManagerForNode(this);
}
EventListenerManager*
nsINode::GetExistingListenerManager() const
{
return nsContentUtils::GetExistingListenerManagerForNode(this);
}
nsIScriptContext*
nsINode::GetContextForEventHandlers(nsresult* aRv)
{
return nsContentUtils::GetContextForEventHandlers(this, aRv);
}
nsIDOMWindow*
nsINode::GetOwnerGlobal()
{
bool dummy;
return nsPIDOMWindow::GetOuterFromCurrentInner(
static_cast<nsGlobalWindow*>(OwnerDoc()->GetScriptHandlingObject(dummy)));
}
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 |
NODE_IS_IN_SHADOW_TREE);
return HasFlag(problematicFlags) ||
NodeType() == nsIDOMNode::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->GetUncomposedDoc();
if (currentDoc &&
nsCCUncollectableMarker::InGeneration(currentDoc->GetMarkedCCGeneration())) {
return false;
}
if (nsCCUncollectableMarker::sGeneration) {
// If we're black no need to traverse.
if (tmp->IsBlack() || tmp->InCCBlackTree()) {
return false;
}
if (!tmp->UnoptimizableCCNode()) {
// If we're in a black document, return early.
if ((currentDoc && currentDoc->IsBlack())) {
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->IsBlack()) {
NS_ABORT_IF_FALSE(parent->IndexOf(tmp) >= 0, "Parent doesn't own us?");
return false;
}
}
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNodeInfo)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(GetParent())
nsSlots *slots = tmp->GetExistingSlots();
if (slots) {
slots->Traverse(cb);
}
if (tmp->HasProperties()) {
nsNodeUtils::TraverseUserData(tmp, cb);
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));
}
}
}
if (tmp->NodeType() != nsIDOMNode::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() != nsIDOMNode::DOCUMENT_NODE &&
tmp->HasFlag(NODE_HAS_LISTENERMANAGER)) {
nsContentUtils::RemoveListenerManager(tmp);
tmp->UnsetFlags(NODE_HAS_LISTENERMANAGER);
}
if (tmp->HasProperties()) {
nsNodeUtils::UnlinkUserData(tmp);
tmp->DeleteProperty(nsGkAtoms::keepobjectsalive);
}
}
static void
ReleaseURI(void*, /* aObject*/
nsIAtom*, /* aPropertyName */
void* aPropertyValue,
void* /* aData */)
{
nsIURI* uri = static_cast<nsIURI*>(aPropertyValue);
NS_RELEASE(uri);
}
nsresult
nsINode::SetExplicitBaseURI(nsIURI* aURI)
{
nsresult rv = SetProperty(nsGkAtoms::baseURIProperty, aURI, ReleaseURI);
if (NS_SUCCEEDED(rv)) {
SetHasExplicitBaseURI();
NS_ADDREF(aURI);
}
return rv;
}
static nsresult
AdoptNodeIntoOwnerDoc(nsINode *aParent, nsINode *aNode)
{
NS_ASSERTION(!aNode->GetParentNode(),
"Should have removed from parent already");
nsIDocument *doc = aParent->OwnerDoc();
nsresult rv;
nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(doc, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMNode> node = do_QueryInterface(aNode, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMNode> adoptedNode;
rv = domDoc->AdoptNode(node, getter_AddRefs(adoptedNode));
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(aParent->OwnerDoc() == doc,
"ownerDoc chainged while adopting");
NS_ASSERTION(adoptedNode == node, "Uh, adopt node changed nodes?");
NS_ASSERTION(aParent->OwnerDoc() == aNode->OwnerDoc(),
"ownerDocument changed again after adopting!");
return NS_OK;
}
static nsresult
CheckForOutdatedParent(nsINode* aParent, nsINode* aNode)
{
if (JSObject* existingObjUnrooted = aNode->GetWrapper()) {
JSRuntime* runtime = JS_GetObjectRuntime(existingObjUnrooted);
JS::Rooted<JSObject*> existingObj(runtime, existingObjUnrooted);
AutoJSContext cx;
nsIGlobalObject* global = aParent->OwnerDoc()->GetScopeObject();
MOZ_ASSERT(global);
if (js::GetGlobalForObjectCrossCompartment(existingObj) !=
global->GetGlobalJSObject()) {
JSAutoCompartment ac(cx, existingObj);
nsresult rv = ReparentWrapper(cx, existingObj);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
nsresult
nsINode::doInsertChildAt(nsIContent* aKid, uint32_t aIndex,
bool aNotify, nsAttrAndChildArray& aChildArray)
{
NS_PRECONDITION(!aKid->GetParentNode(),
"Inserting node that already has parent");
nsresult rv;
// 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(GetCrossShadowCurrentDoc(), UPDATE_CONTENT_MODEL, aNotify);
if (OwnerDoc() != aKid->OwnerDoc()) {
rv = AdoptNodeIntoOwnerDoc(this, aKid);
NS_ENSURE_SUCCESS(rv, rv);
} else if (OwnerDoc()->DidDocumentOpen()) {
rv = CheckForOutdatedParent(this, aKid);
NS_ENSURE_SUCCESS(rv, rv);
}
uint32_t childCount = aChildArray.ChildCount();
NS_ENSURE_TRUE(aIndex <= childCount, NS_ERROR_ILLEGAL_VALUE);
bool isAppend = (aIndex == childCount);
rv = aChildArray.InsertChildAt(aKid, aIndex);
NS_ENSURE_SUCCESS(rv, rv);
if (aIndex == 0) {
mFirstChild = aKid;
}
nsIContent* parent =
IsNodeOfType(eDOCUMENT) ? nullptr : static_cast<nsIContent*>(this);
rv = aKid->BindToTree(doc, parent,
parent ? parent->GetBindingParent() : nullptr,
true);
if (NS_FAILED(rv)) {
if (GetFirstChild() == aKid) {
mFirstChild = aKid->GetNextSibling();
}
aChildArray.RemoveChildAt(aIndex);
aKid->UnbindFromTree();
return rv;
}
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 && isAppend) {
nsNodeUtils::ContentAppended(parent, aKid, aIndex);
} else {
nsNodeUtils::ContentInserted(this, aKid, aIndex);
}
if (nsContentUtils::HasMutationListeners(aKid,
NS_EVENT_BITS_MUTATION_NODEINSERTED, this)) {
InternalMutationEvent mutation(true, NS_MUTATION_NODEINSERTED);
mutation.mRelatedNode = do_QueryInterface(this);
mozAutoSubtreeModified subtree(OwnerDoc(), this);
(new AsyncEventDispatcher(aKid, mutation))->RunDOMEventWhenSafe();
}
}
return NS_OK;
}
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;
}
void
nsINode::Remove()
{
nsCOMPtr<nsINode> parent = GetParentNode();
if (!parent) {
return;
}
int32_t index = parent->IndexOf(this);
if (index < 0) {
NS_WARNING("Ignoring call to nsINode::Remove on anonymous child.");
return;
}
parent->RemoveChildAt(uint32_t(index), true);
}
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;
}
void
nsINode::doRemoveChildAt(uint32_t aIndex, bool aNotify,
nsIContent* aKid, nsAttrAndChildArray& aChildArray)
{
NS_PRECONDITION(aKid && aKid->GetParentNode() == this &&
aKid == GetChildAt(aIndex) &&
IndexOf(aKid) == (int32_t)aIndex, "Bogus aKid");
nsMutationGuard::DidMutate();
mozAutoDocUpdate updateBatch(GetCrossShadowCurrentDoc(), UPDATE_CONTENT_MODEL, aNotify);
nsIContent* previousSibling = aKid->GetPreviousSibling();
if (GetFirstChild() == aKid) {
mFirstChild = aKid->GetNextSibling();
}
aChildArray.RemoveChildAt(aIndex);
if (aNotify) {
nsNodeUtils::ContentRemoved(this, aKid, aIndex, 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->IsNodeOfType(nsINode::eDOCUMENT) ||
aParent->IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT) ||
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->Tag() == nsGkAtoms::_template ||
aNewChild->GetShadowRoot()) &&
nsContentUtils::ContentIsHostIncludingDescendantOf(aParent,
aNewChild))) {
return false;
}
// The allowed child nodes differ for documents and elements
switch (aNewChild->NodeType()) {
case nsIDOMNode::COMMENT_NODE :
case nsIDOMNode::PROCESSING_INSTRUCTION_NODE :
// OK in both cases
return true;
case nsIDOMNode::TEXT_NODE :
case nsIDOMNode::CDATA_SECTION_NODE :
case nsIDOMNode::ENTITY_REFERENCE_NODE :
// Allowed under Elements and DocumentFragments
return aParent->NodeType() != nsIDOMNode::DOCUMENT_NODE;
case nsIDOMNode::ELEMENT_NODE :
{
if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) {
// Always ok to have elements under other elements or document fragments
return true;
}
nsIDocument* parentDocument = static_cast<nsIDocument*>(aParent);
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->IndexOf(docTypeContent);
int32_t insertIndex = aParent->IndexOf(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 nsIDOMNode::DOCUMENT_TYPE_NODE :
{
if (!aParent->IsNodeOfType(nsINode::eDOCUMENT)) {
// doctypes only allowed under documents
return false;
}
nsIDocument* parentDocument = static_cast<nsIDocument*>(aParent);
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->IndexOf(rootElement);
int32_t insertIndex = aParent->IndexOf(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 nsIDOMNode::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->IsNodeOfType(nsINode::eDOCUMENT)) {
// 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;
}
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);
if ((!IsNodeOfType(eDOCUMENT) &&
!IsNodeOfType(eDOCUMENT_FRAGMENT) &&
!IsElement()) ||
!aNewChild->IsNodeOfType(eCONTENT)) {
aError.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
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 IndexOf).
// 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, OwnerDoc());
}
// If the new node already has a parent, fire for removing from old
// parent
nsINode* oldParent = aNewChild->GetParentNode();
if (oldParent) {
nsContentUtils::MaybeFireNodeRemoved(aNewChild, oldParent,
aNewChild->OwnerDoc());
}
// If we're inserting a fragment, fire for all the children of the
// fragment
if (nodeType == nsIDOMNode::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;
}
}
nsIDocument* doc = OwnerDoc();
nsIContent* newContent = static_cast<nsIContent*>(aNewChild);
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 nullptr;
}
// 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 nullptr;
}
// Record the node to insert before, if any
nsINode* nodeToInsertBefore;
if (aReplace) {
nodeToInsertBefore = aRefChild->GetNextSibling();
} else {
nodeToInsertBefore = aRefChild;
}
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<nsAutoTArray<nsCOMPtr<nsIContent>, 50> > fragChildren;
// Remove the new child from the old parent if one exists
nsCOMPtr<nsINode> oldParent = newContent->GetParentNode();
if (oldParent) {
int32_t removeIndex = oldParent->IndexOf(newContent);
if (removeIndex < 0) {
// newContent is anonymous. We can't deal with this, so just bail
NS_ERROR("How come our flags didn't catch this?");
aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
// 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(),
UPDATE_CONTENT_MODEL, true);
nsAutoMutationBatch mb(oldParent, true, true);
oldParent->RemoveChildAt(removeIndex, true);
if (nsAutoMutationBatch::GetCurrentBatch() == &mb) {
mb.RemovalDone();
mb.SetPrevSibling(oldParent->GetChildAt(removeIndex - 1));
mb.SetNextSibling(oldParent->GetChildAt(removeIndex));
}
}
// 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;
}
}
}
} else if (nodeType == nsIDOMNode::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(),
UPDATE_CONTENT_MODEL, true);
nsAutoMutationBatch mb(newContent, false, true);
for (uint32_t i = count; i > 0;) {
newContent->RemoveChildAt(--i, 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 {
nodeToInsertBefore = aRefChild;
}
// 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 (IsNodeOfType(nsINode::eDOCUMENT)) {
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(GetCrossShadowCurrentDoc(), UPDATE_CONTENT_MODEL, true);
nsAutoMutationBatch mb;
// Figure out which index we want to insert at. Note that we use
// nodeToInsertBefore to determine this, because it's possible that
// aRefChild == aNewChild, in which case we just removed it from the
// parent list.
int32_t insPos;
if (nodeToInsertBefore) {
insPos = IndexOf(nodeToInsertBefore);
if (insPos < 0) {
// XXXbz How the heck would _that_ happen, exactly?
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
}
else {
insPos = GetChildCount();
}
// 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");
// An since nodeToInsertBefore is at index insPos, we want to remove
// at the previous index.
NS_ASSERTION(insPos >= 1, "insPos too small");
RemoveChildAt(insPos-1, true);
--insPos;
}
// 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().
if (doc != newContent->OwnerDoc()) {
aError = AdoptNodeIntoOwnerDoc(this, aNewChild);
if (aError.Failed()) {
return nullptr;
}
} else if (doc->DidDocumentOpen()) {
aError = CheckForOutdatedParent(this, aNewChild);
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 == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {
if (!aReplace) {
mb.Init(this, true, true);
}
nsAutoMutationBatch* mutationBatch = nsAutoMutationBatch::GetCurrentBatch();
if (mutationBatch) {
mutationBatch->RemovalDone();
mutationBatch->SetPrevSibling(GetChildAt(insPos - 1));
mutationBatch->SetNextSibling(GetChildAt(insPos));
}
uint32_t count = fragChildren->Length();
if (!count) {
return result;
}
bool appending =
!IsNodeOfType(eDOCUMENT) && uint32_t(insPos) == GetChildCount();
int32_t firstInsPos = insPos;
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, ++insPos) {
// XXXbz how come no reparenting here? That seems odd...
// Insert the child.
aError = InsertChildAt(fragChildren->ElementAt(i), insPos,
!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,
firstInsPos);
}
return nullptr;
}
}
if (mutationBatch && !appending) {
mutationBatch->NodesAdded();
}
// Notify and fire mutation events when appending
if (appending) {
nsNodeUtils::ContentAppended(static_cast<nsIContent*>(this),
firstInsertedContent, firstInsPos);
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(GetChildAt(insPos - 1));
mb.SetNextSibling(GetChildAt(insPos));
}
aError = InsertChildAt(newContent, insPos, true);
if (aError.Failed()) {
return nullptr;
}
}
return result;
}
nsresult
nsINode::ReplaceOrInsertBefore(bool aReplace, nsIDOMNode *aNewChild,
nsIDOMNode *aRefChild, nsIDOMNode **aReturn)
{
nsCOMPtr<nsINode> newChild = do_QueryInterface(aNewChild);
if (!newChild) {
return NS_ERROR_NULL_POINTER;
}
if (aReplace && !aRefChild) {
return NS_ERROR_NULL_POINTER;
}
nsCOMPtr<nsINode> refChild = do_QueryInterface(aRefChild);
if (aRefChild && !refChild) {
return NS_NOINTERFACE;
}
ErrorResult rv;
nsINode* result = ReplaceOrInsertBefore(aReplace, newChild, refChild, rv);
if (result) {
NS_ADDREF(*aReturn = result->AsDOMNode());
}
return rv.ErrorCode();
}
nsresult
nsINode::CompareDocumentPosition(nsIDOMNode* aOther, uint16_t* aReturn)
{
nsCOMPtr<nsINode> other = do_QueryInterface(aOther);
NS_ENSURE_ARG(other);
*aReturn = CompareDocumentPosition(*other);
return NS_OK;
}
nsresult
nsINode::IsEqualNode(nsIDOMNode* aOther, bool* aReturn)
{
nsCOMPtr<nsINode> other = do_QueryInterface(aOther);
*aReturn = IsEqualNode(other);
return NS_OK;
}
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);
}
}
void
nsINode::GetBoundMutationObservers(nsTArray<nsRefPtr<nsDOMMutationObserver> >& aResult)
{
nsCOMArray<nsISupports>* objects =
static_cast<nsCOMArray<nsISupports>*>(GetProperty(nsGkAtoms::keepobjectsalive));
if (objects) {
for (int32_t i = 0; i < objects->Count(); ++i) {
nsCOMPtr<nsDOMMutationObserver> mo = do_QueryInterface(objects->ObjectAt(i));
if (mo) {
MOZ_ASSERT(!aResult.Contains(mo));
aResult.AppendElement(mo.forget());
}
}
}
}
size_t
nsINode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = 0;
EventListenerManager* elm = GetExistingListenerManager();
if (elm) {
n += elm->SizeOfIncludingThis(aMallocSizeOf);
}
// 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, mPreviousSibling, mFirstChild: because they're
// non-owning
return n;
}
#define EVENT(name_, id_, type_, struct_) \
EventHandlerNonNull* nsINode::GetOn##name_() { \
EventListenerManager *elm = GetExistingListenerManager(); \
return elm ? elm->GetEventHandler(nsGkAtoms::on##name_, EmptyString()) \
: nullptr; \
} \
void nsINode::SetOn##name_(EventHandlerNonNull* handler) \
{ \
EventListenerManager *elm = GetOrCreateListenerManager(); \
if (elm) { \
elm->SetEventHandler(nsGkAtoms::on##name_, EmptyString(), 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() ||
IsInDoc() != aOther->IsInDoc() ||
!(aOther->IsElement() ||
aOther->IsNodeOfType(nsINode::eCONTENT)) ||
!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.
// IsInDoc() check is done already before this.
return !other->IsInAnonymousSubtree();
}
if (!IsElement() && !IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT)) {
return false;
}
const nsIContent* thisContent = static_cast<const nsIContent*>(this);
if (thisContent->GetBindingParent() != other->GetBindingParent()) {
return false;
}
return nsContentUtils::ContentIsDescendantOf(other, this);
}
nsresult
nsINode::Contains(nsIDOMNode* aOther, bool* aReturn)
{
nsCOMPtr<nsINode> node = do_QueryInterface(aOther);
*aReturn = Contains(node);
return NS_OK;
}
uint32_t
nsINode::Length() const
{
switch (NodeType()) {
case nsIDOMNode::DOCUMENT_TYPE_NODE:
return 0;
case nsIDOMNode::TEXT_NODE:
case nsIDOMNode::CDATA_SECTION_NODE:
case nsIDOMNode::PROCESSING_INSTRUCTION_NODE:
case nsIDOMNode::COMMENT_NODE:
MOZ_ASSERT(IsNodeOfType(eCONTENT));
return static_cast<const nsIContent*>(this)->TextLength();
default:
return GetChildCount();
}
}
nsCSSSelectorList*
nsINode::ParseSelectorList(const nsAString& aSelectorString,
ErrorResult& aRv)
{
nsIDocument* doc = OwnerDoc();
nsIDocument::SelectorCache& cache = doc->GetSelectorCache();
nsCSSSelectorList* selectorList = nullptr;
bool haveCachedList = cache.GetList(aSelectorString, &selectorList);
if (haveCachedList) {
if (!selectorList) {
// Invalid selector.
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
}
return selectorList;
}
nsCSSParser parser(doc->CSSLoader());
aRv = parser.ParseSelectorString(aSelectorString,
doc->GetDocumentURI(),
0, // XXXbz get the line number!
&selectorList);
if (aRv.Failed()) {
// We hit this for syntax errors, which are quite common, so don't
// use NS_ENSURE_SUCCESS. (For example, jQuery has an extended set
// of selectors, but it sees if we can parse them first.)
MOZ_ASSERT(aRv.ErrorCode() == NS_ERROR_DOM_SYNTAX_ERR,
"Unexpected error, so cached version won't return it");
cache.CacheList(aSelectorString, nullptr);
return nullptr;
}
// Filter out pseudo-element selectors from selectorList
nsCSSSelectorList** slot = &selectorList;
do {
nsCSSSelectorList* cur = *slot;
if (cur->mSelectors->IsPseudoElement()) {
*slot = cur->mNext;
cur->mNext = nullptr;
delete cur;
} else {
slot = &cur->mNext;
}
} while (*slot);
if (selectorList) {
NS_ASSERTION(selectorList->mSelectors,
"How can we not have any selectors?");
cache.CacheList(aSelectorString, selectorList);
} else {
// This is the "only pseudo-element selectors" case, which is
// not common, so just don't worry about caching it. That way a
// null cached value can always indicate an invalid selector.
}
return selectorList;
}
static void
AddScopeElements(TreeMatchContext& aMatchContext,
nsINode* aMatchContextNode)
{
if (aMatchContextNode->IsElement()) {
aMatchContext.SetHasSpecifiedScope();
aMatchContext.AddScopeElement(aMatchContextNode->AsElement());
}
}
namespace {
struct SelectorMatchInfo {
nsCSSSelectorList* const mSelectorList;
TreeMatchContext& mMatchContext;
};
}
// Given an id, find elements with that id under aRoot that match aMatchInfo if
// any is provided. If no SelectorMatchInfo is provided, just find the ones
// with the given id. aRoot must be in the document.
template<bool onlyFirstMatch, class T>
inline static void
FindMatchingElementsWithId(const nsAString& aId, nsINode* aRoot,
SelectorMatchInfo* aMatchInfo,
T& aList)
{
MOZ_ASSERT(aRoot->IsInDoc(),
"Don't call me if the root is not in the document");
MOZ_ASSERT(aRoot->IsElement() || aRoot->IsNodeOfType(nsINode::eDOCUMENT),
"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 IsInDoc(), so should never show up here.");
const nsSmallVoidArray* elements = aRoot->OwnerDoc()->GetAllElementsForId(aId);
if (!elements) {
// Nothing to do; we're done
return;
}
// 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 (int32_t i = 0; i < elements->Count(); ++i) {
Element *element = static_cast<Element*>(elements->ElementAt(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. Make sure it really matches the selector.
if (!aMatchInfo ||
nsCSSRuleProcessor::SelectorListMatches(element,
aMatchInfo->mMatchContext,
aMatchInfo->mSelectorList)) {
aList.AppendElement(element);
if (onlyFirstMatch) {
return;
}
}
}
}
}
// Actually find elements matching aSelectorList (which must not be
// null) and which are descendants of aRoot and put them in aList. If
// onlyFirstMatch, then stop once the first one is found.
template<bool onlyFirstMatch, class Collector, class T>
MOZ_ALWAYS_INLINE static void
FindMatchingElements(nsINode* aRoot, nsCSSSelectorList* aSelectorList, T &aList,
ErrorResult& aRv)
{
nsIDocument* doc = aRoot->OwnerDoc();
TreeMatchContext matchingContext(false, nsRuleWalker::eRelevantLinkUnvisited,
doc, TreeMatchContext::eNeverMatchVisited);
doc->FlushPendingLinkUpdates();
AddScopeElements(matchingContext, aRoot);
// Fast-path selectors involving IDs. We can only do this if aRoot
// is in the document and the document is not in quirks mode, since
// ID selectors are case-insensitive in quirks mode. Also, only do
// this if aSelectorList only has one selector, because otherwise
// ordering the elements correctly is a pain.
NS_ASSERTION(aRoot->IsElement() || aRoot->IsNodeOfType(nsINode::eDOCUMENT) ||
!aRoot->IsInDoc(),
"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.");
if (aRoot->IsInDoc() &&
doc->GetCompatibilityMode() != eCompatibility_NavQuirks &&
!aSelectorList->mNext &&
aSelectorList->mSelectors->mIDList) {
nsIAtom* id = aSelectorList->mSelectors->mIDList->mAtom;
SelectorMatchInfo info = { aSelectorList, matchingContext };
FindMatchingElementsWithId<onlyFirstMatch, T>(nsDependentAtomString(id),
aRoot, &info, aList);
return;
}
Collector results;
for (nsIContent* cur = aRoot->GetFirstChild();
cur;
cur = cur->GetNextNode(aRoot)) {
if (cur->IsElement() &&
nsCSSRuleProcessor::SelectorListMatches(cur->AsElement(),
matchingContext,
aSelectorList)) {
if (onlyFirstMatch) {
aList.AppendElement(cur->AsElement());
return;
}
results.AppendElement(cur->AsElement());
}
}
const uint32_t len = results.Length();
if (len) {
aList.SetCapacity(len);
for (uint32_t i = 0; i < len; ++i) {
aList.AppendElement(results.ElementAt(i));
}
}
}
struct ElementHolder {
ElementHolder() : mElement(nullptr) {}
void AppendElement(Element* aElement) {
NS_ABORT_IF_FALSE(!mElement, "Should only get one element");
mElement = aElement;
}
void SetCapacity(uint32_t aCapacity) { MOZ_CRASH("Don't call me!"); }
uint32_t Length() { return 0; }
Element* ElementAt(uint32_t aIndex) { return nullptr; }
Element* mElement;
};
Element*
nsINode::QuerySelector(const nsAString& aSelector, ErrorResult& aResult)
{
nsCSSSelectorList* selectorList = ParseSelectorList(aSelector, aResult);
if (!selectorList) {
// Either we failed (and aResult already has the exception), or this
// is a pseudo-element-only selector that matches nothing.
return nullptr;
}
ElementHolder holder;
FindMatchingElements<true, ElementHolder>(this, selectorList, holder, aResult);
return holder.mElement;
}
already_AddRefed<nsINodeList>
nsINode::QuerySelectorAll(const nsAString& aSelector, ErrorResult& aResult)
{
nsRefPtr<nsSimpleContentList> contentList = new nsSimpleContentList(this);
nsCSSSelectorList* selectorList = ParseSelectorList(aSelector, aResult);
if (selectorList) {
FindMatchingElements<false, nsAutoTArray<Element*, 128>>(this,
selectorList,
*contentList,
aResult);
} else {
// Either we failed (and aResult already has the exception), or this
// is a pseudo-element-only selector that matches nothing.
}
return contentList.forget();
}
nsresult
nsINode::QuerySelector(const nsAString& aSelector, nsIDOMElement **aReturn)
{
ErrorResult rv;
Element* result = nsINode::QuerySelector(aSelector, rv);
if (rv.Failed()) {
return rv.ErrorCode();
}
nsCOMPtr<nsIDOMElement> elt = do_QueryInterface(result);
elt.forget(aReturn);
return NS_OK;
}
nsresult
nsINode::QuerySelectorAll(const nsAString& aSelector, nsIDOMNodeList **aReturn)
{
ErrorResult rv;
*aReturn = nsINode::QuerySelectorAll(aSelector, rv).take();
return rv.ErrorCode();
}
Element*
nsINode::GetElementById(const nsAString& aId)
{
MOZ_ASSERT(IsElement() || IsNodeOfType(eDOCUMENT_FRAGMENT),
"Bogus this object for GetElementById call");
if (IsInDoc()) {
ElementHolder holder;
FindMatchingElementsWithId<true>(aId, this, nullptr, holder);
return holder.mElement;
}
for (nsIContent* kid = GetFirstChild(); kid; kid = kid->GetNextNode(this)) {
if (!kid->IsElement()) {
continue;
}
nsIAtom* id = kid->AsElement()->GetID();
if (id && id->Equals(aId)) {
return kid->AsElement();
}
}
return nullptr;
}
JSObject*
nsINode::WrapObject(JSContext *aCx)
{
// 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::IsCallerChrome()) {
Throw(aCx, NS_ERROR_UNEXPECTED);
return nullptr;
}
JS::Rooted<JSObject*> obj(aCx, WrapNode(aCx));
MOZ_ASSERT_IF(ChromeOnlyAccess(),
xpc::IsInContentXBLScope(obj) || !xpc::UseContentXBLScope(js::GetObjectCompartment(obj)));
return obj;
}
already_AddRefed<nsINode>
nsINode::CloneNode(bool aDeep, ErrorResult& aError)
{
nsCOMPtr<nsINode> result;
aError = nsNodeUtils::CloneNodeImpl(this, aDeep, getter_AddRefs(result));
return result.forget();
}
nsDOMAttributeMap*
nsINode::GetAttributes()
{
if (!IsElement()) {
return nullptr;
}
return AsElement()->Attributes();
}
bool
EventTarget::DispatchEvent(Event& aEvent,
ErrorResult& aRv)
{
bool result = false;
aRv = DispatchEvent(&aEvent, &result);
return result;
}
Element*
nsINode::GetParentElementCrossingShadowRoot() const
{
if (!mParent) {
return nullptr;
}
if (mParent->IsElement()) {
return mParent->AsElement();
}
ShadowRoot* shadowRoot = ShadowRoot::FromNode(mParent);
if (shadowRoot) {
nsIContent* host = shadowRoot->GetHost();
MOZ_ASSERT(host, "ShowRoots should always have a host");
MOZ_ASSERT(host->IsElement(), "ShadowRoot hosts should always be Elements");
return host->AsElement();
}
return nullptr;
}
bool
nsINode::HasBoxQuadsSupport(JSContext* aCx, JSObject* /* unused */)
{
return xpc::AccessCheck::isChrome(js::GetContextCompartment(aCx)) ||
Preferences::GetBool("layout.css.getBoxQuads.enabled");
}
nsINode*
nsINode::GetScopeChainParent() const
{
return nullptr;
}
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