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gecko-dev/dom/base/nsNodeUtils.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/. */
#include "nsNodeUtils.h"
#include "nsContentUtils.h"
#include "nsINode.h"
#include "nsIContent.h"
#include "mozilla/dom/Element.h"
#include "nsIMutationObserver.h"
#include "nsIDocument.h"
#include "mozilla/EventListenerManager.h"
#include "nsIXPConnect.h"
#include "PLDHashTable.h"
#include "nsIDOMAttr.h"
#include "nsCOMArray.h"
#include "nsPIDOMWindow.h"
#include "nsDocument.h"
#ifdef MOZ_XUL
#include "nsXULElement.h"
#endif
#include "nsBindingManager.h"
#include "nsGenericHTMLElement.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/Animation.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "nsWrapperCacheInlines.h"
#include "nsObjectLoadingContent.h"
#include "nsDOMMutationObserver.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "mozilla/dom/ShadowRoot.h"
using namespace mozilla;
using namespace mozilla::dom;
using mozilla::AutoJSContext;
// This macro expects the ownerDocument of content_ to be in scope as
// |nsIDocument* doc|
#define IMPL_MUTATION_NOTIFICATION(func_, content_, params_) \
PR_BEGIN_MACRO \
bool needsEnterLeave = doc->MayHaveDOMMutationObservers(); \
if (needsEnterLeave) { \
nsDOMMutationObserver::EnterMutationHandling(); \
} \
nsINode* node = content_; \
NS_ASSERTION(node->OwnerDoc() == doc, "Bogus document"); \
if (doc) { \
doc->BindingManager()->func_ params_; \
} \
do { \
nsINode::nsSlots* slots = node->GetExistingSlots(); \
if (slots && !slots->mMutationObservers.IsEmpty()) { \
/* No need to explicitly notify the first observer first \
since that'll happen anyway. */ \
NS_OBSERVER_ARRAY_NOTIFY_OBSERVERS( \
slots->mMutationObservers, nsIMutationObserver, \
func_, params_); \
} \
ShadowRoot* shadow = ShadowRoot::FromNode(node); \
if (shadow) { \
node = shadow->GetPoolHost(); \
} else { \
node = node->GetParentNode(); \
} \
} while (node); \
if (needsEnterLeave) { \
nsDOMMutationObserver::LeaveMutationHandling(); \
} \
PR_END_MACRO
#define IMPL_ANIMATION_NOTIFICATION(func_, content_, params_) \
PR_BEGIN_MACRO \
bool needsEnterLeave = doc->MayHaveDOMMutationObservers(); \
if (needsEnterLeave) { \
nsDOMMutationObserver::EnterMutationHandling(); \
} \
nsINode* node = content_; \
do { \
nsINode::nsSlots* slots = node->GetExistingSlots(); \
if (slots && !slots->mMutationObservers.IsEmpty()) { \
/* No need to explicitly notify the first observer first \
since that'll happen anyway. */ \
NS_OBSERVER_ARRAY_NOTIFY_OBSERVERS_WITH_QI( \
slots->mMutationObservers, nsIMutationObserver, \
nsIAnimationObserver, func_, params_); \
} \
ShadowRoot* shadow = ShadowRoot::FromNode(node); \
if (shadow) { \
node = shadow->GetPoolHost(); \
} else { \
node = node->GetParentNode(); \
} \
} while (node); \
if (needsEnterLeave) { \
nsDOMMutationObserver::LeaveMutationHandling(); \
} \
PR_END_MACRO
void
nsNodeUtils::CharacterDataWillChange(nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
nsIDocument* doc = aContent->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(CharacterDataWillChange, aContent,
(doc, aContent, aInfo));
}
void
nsNodeUtils::CharacterDataChanged(nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
nsIDocument* doc = aContent->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(CharacterDataChanged, aContent,
(doc, aContent, aInfo));
}
void
nsNodeUtils::AttributeWillChange(Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue)
{
nsIDocument* doc = aElement->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(AttributeWillChange, aElement,
(doc, aElement, aNameSpaceID, aAttribute,
aModType, aNewValue));
}
void
nsNodeUtils::AttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
nsIDocument* doc = aElement->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(AttributeChanged, aElement,
(doc, aElement, aNameSpaceID, aAttribute,
aModType, aOldValue));
}
void
nsNodeUtils::AttributeSetToCurrentValue(Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute)
{
nsIDocument* doc = aElement->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(AttributeSetToCurrentValue, aElement,
(doc, aElement, aNameSpaceID, aAttribute));
}
void
nsNodeUtils::ContentAppended(nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
nsIDocument* doc = aContainer->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(ContentAppended, aContainer,
(doc, aContainer, aFirstNewContent,
aNewIndexInContainer));
}
void
nsNodeUtils::NativeAnonymousChildListChange(nsIContent* aContent,
bool aIsRemove)
{
nsIDocument* doc = aContent->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(NativeAnonymousChildListChange, aContent,
(doc, aContent, aIsRemove));
}
void
nsNodeUtils::ContentInserted(nsINode* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NS_PRECONDITION(aContainer->IsNodeOfType(nsINode::eCONTENT) ||
aContainer->IsNodeOfType(nsINode::eDOCUMENT),
"container must be an nsIContent or an nsIDocument");
nsIContent* container;
nsIDocument* doc = aContainer->OwnerDoc();
nsIDocument* document;
if (aContainer->IsNodeOfType(nsINode::eCONTENT)) {
container = static_cast<nsIContent*>(aContainer);
document = doc;
}
else {
container = nullptr;
document = static_cast<nsIDocument*>(aContainer);
}
IMPL_MUTATION_NOTIFICATION(ContentInserted, aContainer,
(document, container, aChild, aIndexInContainer));
}
void
nsNodeUtils::ContentRemoved(nsINode* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
NS_PRECONDITION(aContainer->IsNodeOfType(nsINode::eCONTENT) ||
aContainer->IsNodeOfType(nsINode::eDOCUMENT),
"container must be an nsIContent or an nsIDocument");
nsIContent* container;
nsIDocument* doc = aContainer->OwnerDoc();
nsIDocument* document;
if (aContainer->IsNodeOfType(nsINode::eCONTENT)) {
container = static_cast<nsIContent*>(aContainer);
document = doc;
}
else {
container = nullptr;
document = static_cast<nsIDocument*>(aContainer);
}
IMPL_MUTATION_NOTIFICATION(ContentRemoved, aContainer,
(document, container, aChild, aIndexInContainer,
aPreviousSibling));
}
Element*
nsNodeUtils::GetTargetForAnimation(const Animation* aAnimation)
{
KeyframeEffectReadOnly* effect = aAnimation->GetEffect();
if (!effect) {
return nullptr;
}
Element* target;
nsCSSPseudoElements::Type pseudoType;
effect->GetTarget(target, pseudoType);
// If the animation targets a pseudo-element, we don't dispatch
// notifications for it. (In the future we will have PseudoElement
// objects we can use as the target of the notifications.)
if (pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement) {
return nullptr;
}
return effect->GetTarget();
}
void
nsNodeUtils::AnimationAdded(Animation* aAnimation)
{
Element* target = GetTargetForAnimation(aAnimation);
if (!target) {
return;
}
nsIDocument* doc = target->OwnerDoc();
if (doc->MayHaveAnimationObservers()) {
IMPL_ANIMATION_NOTIFICATION(AnimationAdded, target, (aAnimation));
}
}
void
nsNodeUtils::AnimationChanged(Animation* aAnimation)
{
Element* target = GetTargetForAnimation(aAnimation);
if (!target) {
return;
}
nsIDocument* doc = target->OwnerDoc();
if (doc->MayHaveAnimationObservers()) {
IMPL_ANIMATION_NOTIFICATION(AnimationChanged, target, (aAnimation));
}
}
void
nsNodeUtils::AnimationRemoved(Animation* aAnimation)
{
Element* target = GetTargetForAnimation(aAnimation);
if (!target) {
return;
}
nsIDocument* doc = target->OwnerDoc();
if (doc->MayHaveAnimationObservers()) {
IMPL_ANIMATION_NOTIFICATION(AnimationRemoved, target, (aAnimation));
}
}
void
nsNodeUtils::LastRelease(nsINode* aNode)
{
nsINode::nsSlots* slots = aNode->GetExistingSlots();
if (slots) {
if (!slots->mMutationObservers.IsEmpty()) {
NS_OBSERVER_ARRAY_NOTIFY_OBSERVERS(slots->mMutationObservers,
nsIMutationObserver,
NodeWillBeDestroyed, (aNode));
}
delete slots;
aNode->mSlots = nullptr;
}
// Kill properties first since that may run external code, so we want to
// be in as complete state as possible at that time.
if (aNode->IsNodeOfType(nsINode::eDOCUMENT)) {
// Delete all properties before tearing down the document. Some of the
// properties are bound to nsINode objects and the destructor functions of
// the properties may want to use the owner document of the nsINode.
static_cast<nsIDocument*>(aNode)->DeleteAllProperties();
}
else {
if (aNode->HasProperties()) {
// Strong reference to the document so that deleting properties can't
// delete the document.
nsCOMPtr<nsIDocument> document = aNode->OwnerDoc();
document->DeleteAllPropertiesFor(aNode);
}
// I wonder whether it's faster to do the HasFlag check first....
if (aNode->IsNodeOfType(nsINode::eHTML_FORM_CONTROL) &&
aNode->HasFlag(ADDED_TO_FORM)) {
// Tell the form (if any) this node is going away. Don't
// notify, since we're being destroyed in any case.
static_cast<nsGenericHTMLFormElement*>(aNode)->ClearForm(true);
}
if (aNode->IsHTMLElement(nsGkAtoms::img) &&
aNode->HasFlag(ADDED_TO_FORM)) {
HTMLImageElement* imageElem = static_cast<HTMLImageElement*>(aNode);
imageElem->ClearForm(true);
}
}
aNode->UnsetFlags(NODE_HAS_PROPERTIES);
if (aNode->NodeType() != nsIDOMNode::DOCUMENT_NODE &&
aNode->HasFlag(NODE_HAS_LISTENERMANAGER)) {
#ifdef DEBUG
if (nsContentUtils::IsInitialized()) {
EventListenerManager* manager =
nsContentUtils::GetExistingListenerManagerForNode(aNode);
if (!manager) {
NS_ERROR("Huh, our bit says we have a listener manager list, "
"but there's nothing in the hash!?!!");
}
}
#endif
nsContentUtils::RemoveListenerManager(aNode);
aNode->UnsetFlags(NODE_HAS_LISTENERMANAGER);
}
if (aNode->IsElement()) {
nsIDocument* ownerDoc = aNode->OwnerDoc();
Element* elem = aNode->AsElement();
ownerDoc->ClearBoxObjectFor(elem);
NS_ASSERTION(aNode->HasFlag(NODE_FORCE_XBL_BINDINGS) ||
!elem->GetXBLBinding(),
"Non-forced node has binding on destruction");
// if NODE_FORCE_XBL_BINDINGS is set, the node might still have a binding
// attached
if (aNode->HasFlag(NODE_FORCE_XBL_BINDINGS) &&
ownerDoc->BindingManager()) {
ownerDoc->BindingManager()->RemovedFromDocument(elem, ownerDoc);
}
}
aNode->ReleaseWrapper(aNode);
FragmentOrElement::RemoveBlackMarkedNode(aNode);
}
static void
NoteUserData(void *aObject, nsIAtom *aKey, void *aXPCOMChild, void *aData)
{
nsCycleCollectionTraversalCallback* cb =
static_cast<nsCycleCollectionTraversalCallback*>(aData);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*cb, "[user data]");
cb->NoteXPCOMChild(static_cast<nsISupports*>(aXPCOMChild));
}
/* static */
void
nsNodeUtils::TraverseUserData(nsINode* aNode,
nsCycleCollectionTraversalCallback &aCb)
{
nsIDocument* ownerDoc = aNode->OwnerDoc();
ownerDoc->PropertyTable(DOM_USER_DATA)->Enumerate(aNode, NoteUserData, &aCb);
}
/* static */
nsresult
nsNodeUtils::CloneNodeImpl(nsINode *aNode, bool aDeep, nsINode **aResult)
{
*aResult = nullptr;
nsCOMPtr<nsINode> newNode;
nsCOMArray<nsINode> nodesWithProperties;
nsresult rv = Clone(aNode, aDeep, nullptr, nodesWithProperties,
getter_AddRefs(newNode));
NS_ENSURE_SUCCESS(rv, rv);
newNode.swap(*aResult);
return NS_OK;
}
/* static */
nsresult
nsNodeUtils::CloneAndAdopt(nsINode *aNode, bool aClone, bool aDeep,
nsNodeInfoManager *aNewNodeInfoManager,
JS::Handle<JSObject*> aReparentScope,
nsCOMArray<nsINode> &aNodesWithProperties,
nsINode *aParent, nsINode **aResult)
{
NS_PRECONDITION((!aClone && aNewNodeInfoManager) || !aReparentScope,
"If cloning or not getting a new nodeinfo we shouldn't "
"rewrap");
NS_PRECONDITION(!aParent || aNode->IsNodeOfType(nsINode::eCONTENT),
"Can't insert document or attribute nodes into a parent");
*aResult = nullptr;
// First deal with aNode and walk its attributes (and their children). Then,
// if aDeep is true, deal with aNode's children (and recurse into their
// attributes and children).
nsAutoScriptBlocker scriptBlocker;
AutoJSContext cx;
nsresult rv;
nsNodeInfoManager *nodeInfoManager = aNewNodeInfoManager;
// aNode.
NodeInfo *nodeInfo = aNode->mNodeInfo;
RefPtr<NodeInfo> newNodeInfo;
if (nodeInfoManager) {
// Don't allow importing/adopting nodes from non-privileged "scriptable"
// documents to "non-scriptable" documents.
nsIDocument* newDoc = nodeInfoManager->GetDocument();
NS_ENSURE_STATE(newDoc);
bool hasHadScriptHandlingObject = false;
if (!newDoc->GetScriptHandlingObject(hasHadScriptHandlingObject) &&
!hasHadScriptHandlingObject) {
nsIDocument* currentDoc = aNode->OwnerDoc();
NS_ENSURE_STATE((nsContentUtils::IsChromeDoc(currentDoc) ||
(!currentDoc->GetScriptHandlingObject(hasHadScriptHandlingObject) &&
!hasHadScriptHandlingObject)));
}
newNodeInfo = nodeInfoManager->GetNodeInfo(nodeInfo->NameAtom(),
nodeInfo->GetPrefixAtom(),
nodeInfo->NamespaceID(),
nodeInfo->NodeType(),
nodeInfo->GetExtraName());
nodeInfo = newNodeInfo;
}
Element *elem = aNode->IsElement() ? aNode->AsElement() : nullptr;
nsCOMPtr<nsINode> clone;
if (aClone) {
rv = aNode->Clone(nodeInfo, getter_AddRefs(clone));
NS_ENSURE_SUCCESS(rv, rv);
if (clone->IsElement()) {
// The cloned node may be a custom element that may require
// enqueing created callback and prototype swizzling.
Element* elem = clone->AsElement();
if (nsContentUtils::IsCustomElementName(nodeInfo->NameAtom())) {
elem->OwnerDoc()->SetupCustomElement(elem, nodeInfo->NamespaceID());
} else {
// Check if node may be custom element by type extension.
// ex. <button is="x-button">
nsAutoString extension;
if (elem->GetAttr(kNameSpaceID_None, nsGkAtoms::is, extension) &&
!extension.IsEmpty()) {
elem->OwnerDoc()->SetupCustomElement(elem, nodeInfo->NamespaceID(),
&extension);
}
}
}
if (aParent) {
// If we're cloning we need to insert the cloned children into the cloned
// parent.
rv = aParent->AppendChildTo(static_cast<nsIContent*>(clone.get()),
false);
NS_ENSURE_SUCCESS(rv, rv);
}
else if (aDeep && clone->IsNodeOfType(nsINode::eDOCUMENT)) {
// After cloning the document itself, we want to clone the children into
// the cloned document (somewhat like cloning and importing them into the
// cloned document).
nodeInfoManager = clone->mNodeInfo->NodeInfoManager();
}
}
else if (nodeInfoManager) {
nsIDocument* oldDoc = aNode->OwnerDoc();
bool wasRegistered = false;
if (aNode->IsElement()) {
Element* element = aNode->AsElement();
oldDoc->ClearBoxObjectFor(element);
wasRegistered = oldDoc->UnregisterActivityObserver(element);
}
aNode->mNodeInfo.swap(newNodeInfo);
if (elem) {
elem->NodeInfoChanged(newNodeInfo);
}
nsIDocument* newDoc = aNode->OwnerDoc();
if (newDoc) {
// XXX what if oldDoc is null, we don't know if this should be
// registered or not! Can that really happen?
if (wasRegistered) {
newDoc->RegisterActivityObserver(aNode->AsElement());
}
nsPIDOMWindow* window = newDoc->GetInnerWindow();
if (window) {
EventListenerManager* elm = aNode->GetExistingListenerManager();
if (elm) {
window->SetMutationListeners(elm->MutationListenerBits());
if (elm->MayHavePaintEventListener()) {
window->SetHasPaintEventListeners();
}
if (elm->MayHaveTouchEventListener()) {
window->SetHasTouchEventListeners();
}
if (elm->MayHaveMouseEnterLeaveEventListener()) {
window->SetHasMouseEnterLeaveEventListeners();
}
if (elm->MayHavePointerEnterLeaveEventListener()) {
window->SetHasPointerEnterLeaveEventListeners();
}
}
}
}
if (wasRegistered && oldDoc != newDoc) {
nsCOMPtr<nsIDOMHTMLMediaElement> domMediaElem(do_QueryInterface(aNode));
if (domMediaElem) {
HTMLMediaElement* mediaElem = static_cast<HTMLMediaElement*>(aNode);
mediaElem->NotifyOwnerDocumentActivityChanged();
}
nsCOMPtr<nsIObjectLoadingContent> objectLoadingContent(do_QueryInterface(aNode));
if (objectLoadingContent) {
nsObjectLoadingContent* olc = static_cast<nsObjectLoadingContent*>(objectLoadingContent.get());
olc->NotifyOwnerDocumentActivityChanged();
}
}
if (oldDoc != newDoc && oldDoc->MayHaveDOMMutationObservers()) {
newDoc->SetMayHaveDOMMutationObservers();
}
if (oldDoc != newDoc && oldDoc->MayHaveAnimationObservers()) {
newDoc->SetMayHaveAnimationObservers();
}
if (elem) {
elem->RecompileScriptEventListeners();
}
if (aReparentScope) {
JS::Rooted<JSObject*> wrapper(cx);
if ((wrapper = aNode->GetWrapper())) {
MOZ_ASSERT(IsDOMObject(wrapper));
JSAutoCompartment ac(cx, wrapper);
rv = ReparentWrapper(cx, wrapper);
if (NS_FAILED(rv)) {
aNode->mNodeInfo.swap(nodeInfo);
return rv;
}
}
}
}
if (aDeep && (!aClone || !aNode->IsNodeOfType(nsINode::eATTRIBUTE))) {
// aNode's children.
for (nsIContent* cloneChild = aNode->GetFirstChild();
cloneChild;
cloneChild = cloneChild->GetNextSibling()) {
nsCOMPtr<nsINode> child;
rv = CloneAndAdopt(cloneChild, aClone, true, nodeInfoManager,
aReparentScope, aNodesWithProperties, clone,
getter_AddRefs(child));
NS_ENSURE_SUCCESS(rv, rv);
}
}
// Cloning template element.
if (aDeep && aClone && IsTemplateElement(aNode)) {
DocumentFragment* origContent =
static_cast<HTMLTemplateElement*>(aNode)->Content();
DocumentFragment* cloneContent =
static_cast<HTMLTemplateElement*>(clone.get())->Content();
// Clone the children into the clone's template content owner
// document's nodeinfo manager.
nsNodeInfoManager* ownerNodeInfoManager =
cloneContent->mNodeInfo->NodeInfoManager();
for (nsIContent* cloneChild = origContent->GetFirstChild();
cloneChild;
cloneChild = cloneChild->GetNextSibling()) {
nsCOMPtr<nsINode> child;
rv = CloneAndAdopt(cloneChild, aClone, aDeep, ownerNodeInfoManager,
aReparentScope, aNodesWithProperties, cloneContent,
getter_AddRefs(child));
NS_ENSURE_SUCCESS(rv, rv);
}
}
// XXX setting document on some nodes not in a document so XBL will bind
// and chrome won't break. Make XBL bind to document-less nodes!
// XXXbz Once this is fixed, fix up the asserts in all implementations of
// BindToTree to assert what they would like to assert, and fix the
// ChangeDocumentFor() call in nsXULElement::BindToTree as well. Also,
// remove the UnbindFromTree call in ~nsXULElement, and add back in the
// precondition in nsXULElement::UnbindFromTree and remove the line in
// nsXULElement.h that makes nsNodeUtils a friend of nsXULElement.
// Note: Make sure to do this witchery _after_ we've done any deep
// cloning, so kids of the new node aren't confused about whether they're
// in a document.
#ifdef MOZ_XUL
if (aClone && !aParent && aNode->IsXULElement()) {
if (!aNode->OwnerDoc()->IsLoadedAsInteractiveData()) {
clone->SetFlags(NODE_FORCE_XBL_BINDINGS);
}
}
#endif
if (aNode->HasProperties()) {
bool ok = aNodesWithProperties.AppendObject(aNode);
if (aClone) {
ok = ok && aNodesWithProperties.AppendObject(clone);
}
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
}
clone.forget(aResult);
return NS_OK;
}
/* static */
void
nsNodeUtils::UnlinkUserData(nsINode *aNode)
{
NS_ASSERTION(aNode->HasProperties(), "Call to UnlinkUserData not needed.");
// Strong reference to the document so that deleting properties can't
// delete the document.
nsCOMPtr<nsIDocument> document = aNode->OwnerDoc();
document->PropertyTable(DOM_USER_DATA)->DeleteAllPropertiesFor(aNode);
}
bool
nsNodeUtils::IsTemplateElement(const nsINode *aNode)
{
return aNode->IsHTMLElement(nsGkAtoms::_template);
}
nsIContent*
nsNodeUtils::GetFirstChildOfTemplateOrNode(nsINode* aNode)
{
if (nsNodeUtils::IsTemplateElement(aNode)) {
DocumentFragment* frag =
static_cast<HTMLTemplateElement*>(aNode)->Content();
return frag->GetFirstChild();
}
return aNode->GetFirstChild();
}
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