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gecko-dev/dom/base/nsDOMMutationObserver.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 "nsDOMMutationObserver.h"
#include "mozilla/AnimationTarget.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/Maybe.h"
#include "mozilla/OwningNonNull.h"
#include "mozilla/dom/Animation.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/BasePrincipal.h"
#include "nsContentUtils.h"
#include "nsCSSPseudoElements.h"
#include "nsError.h"
#include "nsIScriptGlobalObject.h"
#include "nsNameSpaceManager.h"
#include "nsServiceManagerUtils.h"
#include "nsTextFragment.h"
#include "nsThreadUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
AutoTArray<RefPtr<nsDOMMutationObserver>, 4>*
nsDOMMutationObserver::sScheduledMutationObservers = nullptr;
uint32_t nsDOMMutationObserver::sMutationLevel = 0;
uint64_t nsDOMMutationObserver::sCount = 0;
AutoTArray<AutoTArray<RefPtr<nsDOMMutationObserver>, 4>, 4>*
nsDOMMutationObserver::sCurrentlyHandlingObservers = nullptr;
nsINodeList* nsDOMMutationRecord::AddedNodes() {
if (!mAddedNodes) {
mAddedNodes = new nsSimpleContentList(mTarget);
}
return mAddedNodes;
}
nsINodeList* nsDOMMutationRecord::RemovedNodes() {
if (!mRemovedNodes) {
mRemovedNodes = new nsSimpleContentList(mTarget);
}
return mRemovedNodes;
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMMutationRecord)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMMutationRecord)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMMutationRecord)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsDOMMutationRecord, mTarget,
mPreviousSibling, mNextSibling,
mAddedNodes, mRemovedNodes,
mAddedAnimations, mRemovedAnimations,
mChangedAnimations, mNext, mOwner)
// Observer
bool nsMutationReceiverBase::IsObservable(nsIContent* aContent) {
return !aContent->ChromeOnlyAccess() || ChromeOnlyNodes();
}
bool nsMutationReceiverBase::ObservesAttr(nsINode* aRegisterTarget,
Element* aElement,
int32_t aNameSpaceID, nsAtom* aAttr) {
if (mParent) {
return mParent->ObservesAttr(aRegisterTarget, aElement, aNameSpaceID,
aAttr);
}
if (!Attributes() || (!Subtree() && aElement != Target()) ||
(Subtree() &&
aRegisterTarget->SubtreeRoot() != aElement->SubtreeRoot()) ||
!IsObservable(aElement)) {
return false;
}
if (AllAttributes()) {
return true;
}
if (aNameSpaceID != kNameSpaceID_None) {
return false;
}
nsTArray<RefPtr<nsAtom>>& filters = AttributeFilter();
for (size_t i = 0; i < filters.Length(); ++i) {
if (filters[i] == aAttr) {
return true;
}
}
return false;
}
NS_IMPL_ADDREF(nsMutationReceiver)
NS_IMPL_RELEASE(nsMutationReceiver)
NS_INTERFACE_MAP_BEGIN(nsMutationReceiver)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_END
nsMutationReceiver::nsMutationReceiver(nsINode* aTarget,
nsDOMMutationObserver* aObserver)
: nsMutationReceiverBase(aTarget, aObserver) {
mTarget->BindObject(aObserver);
}
void nsMutationReceiver::Disconnect(bool aRemoveFromObserver) {
if (mRegisterTarget) {
mRegisterTarget->RemoveMutationObserver(this);
mRegisterTarget = nullptr;
}
mParent = nullptr;
nsINode* target = mTarget;
mTarget = nullptr;
nsDOMMutationObserver* observer = mObserver;
mObserver = nullptr;
RemoveClones();
if (target && observer) {
if (aRemoveFromObserver) {
static_cast<nsDOMMutationObserver*>(observer)->RemoveReceiver(this);
}
// UnbindObject may delete 'this'!
target->UnbindObject(observer);
}
}
void nsMutationReceiver::AttributeWillChange(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
if (nsAutoMutationBatch::IsBatching() ||
!ObservesAttr(RegisterTarget(), aElement, aNameSpaceID, aAttribute)) {
return;
}
nsDOMMutationRecord* m = Observer()->CurrentRecord(nsGkAtoms::attributes);
NS_ASSERTION(!m->mTarget || m->mTarget == aElement, "Wrong target!");
NS_ASSERTION(!m->mAttrName || m->mAttrName == aAttribute, "Wrong attribute!");
if (!m->mTarget) {
m->mTarget = aElement;
m->mAttrName = aAttribute;
if (aNameSpaceID == kNameSpaceID_None) {
m->mAttrNamespace.SetIsVoid(true);
} else {
nsNameSpaceManager::GetInstance()->GetNameSpaceURI(aNameSpaceID,
m->mAttrNamespace);
}
}
if (AttributeOldValue() && m->mPrevValue.IsVoid()) {
if (!aElement->GetAttr(aNameSpaceID, aAttribute, m->mPrevValue)) {
m->mPrevValue.SetIsVoid(true);
}
}
}
void nsMutationReceiver::CharacterDataWillChange(
nsIContent* aContent, const CharacterDataChangeInfo&) {
if (nsAutoMutationBatch::IsBatching() || !CharacterData() ||
(!Subtree() && aContent != Target()) ||
(Subtree() &&
RegisterTarget()->SubtreeRoot() != aContent->SubtreeRoot()) ||
!IsObservable(aContent)) {
return;
}
nsDOMMutationRecord* m = Observer()->CurrentRecord(nsGkAtoms::characterData);
NS_ASSERTION(!m->mTarget || m->mTarget == aContent, "Wrong target!");
if (!m->mTarget) {
m->mTarget = aContent;
}
if (CharacterDataOldValue() && m->mPrevValue.IsVoid()) {
aContent->GetText()->AppendTo(m->mPrevValue);
}
}
void nsMutationReceiver::ContentAppended(nsIContent* aFirstNewContent) {
nsINode* parent = aFirstNewContent->GetParentNode();
bool wantsChildList =
ChildList() && ((Subtree() && RegisterTarget()->SubtreeRoot() ==
parent->SubtreeRoot()) ||
parent == Target());
if (!wantsChildList || !IsObservable(aFirstNewContent)) {
return;
}
if (nsAutoMutationBatch::IsBatching()) {
if (parent == nsAutoMutationBatch::GetBatchTarget()) {
nsAutoMutationBatch::UpdateObserver(Observer(), wantsChildList);
}
return;
}
nsDOMMutationRecord* m = Observer()->CurrentRecord(nsGkAtoms::childList);
NS_ASSERTION(!m->mTarget || m->mTarget == parent, "Wrong target!");
if (m->mTarget) {
// Already handled case.
return;
}
m->mTarget = parent;
m->mAddedNodes = new nsSimpleContentList(parent);
nsINode* n = aFirstNewContent;
while (n) {
m->mAddedNodes->AppendElement(static_cast<nsIContent*>(n));
n = n->GetNextSibling();
}
m->mPreviousSibling = aFirstNewContent->GetPreviousSibling();
}
void nsMutationReceiver::ContentInserted(nsIContent* aChild) {
nsINode* parent = aChild->GetParentNode();
bool wantsChildList =
ChildList() && ((Subtree() && RegisterTarget()->SubtreeRoot() ==
parent->SubtreeRoot()) ||
parent == Target());
if (!wantsChildList || !IsObservable(aChild)) {
return;
}
if (nsAutoMutationBatch::IsBatching()) {
if (parent == nsAutoMutationBatch::GetBatchTarget()) {
nsAutoMutationBatch::UpdateObserver(Observer(), wantsChildList);
}
return;
}
nsDOMMutationRecord* m = Observer()->CurrentRecord(nsGkAtoms::childList);
if (m->mTarget) {
// Already handled case.
return;
}
m->mTarget = parent;
m->mAddedNodes = new nsSimpleContentList(parent);
m->mAddedNodes->AppendElement(aChild);
m->mPreviousSibling = aChild->GetPreviousSibling();
m->mNextSibling = aChild->GetNextSibling();
}
void nsMutationReceiver::ContentRemoved(nsIContent* aChild,
nsIContent* aPreviousSibling) {
if (!IsObservable(aChild)) {
return;
}
nsINode* parent = aChild->GetParentNode();
if (Subtree() && parent->SubtreeRoot() != RegisterTarget()->SubtreeRoot()) {
return;
}
if (nsAutoMutationBatch::IsBatching()) {
if (nsAutoMutationBatch::IsRemovalDone()) {
// This can happen for example if HTML parser parses to
// context node, but needs to move elements around.
return;
}
if (nsAutoMutationBatch::GetBatchTarget() != parent) {
return;
}
bool wantsChildList = ChildList() && (Subtree() || parent == Target());
if (wantsChildList || Subtree()) {
nsAutoMutationBatch::NodeRemoved(aChild);
nsAutoMutationBatch::UpdateObserver(Observer(), wantsChildList);
}
return;
}
if (Subtree()) {
// Try to avoid creating transient observer if the node
// already has an observer observing the same set of nodes.
nsMutationReceiver* orig = GetParent() ? GetParent() : this;
if (Observer()->GetReceiverFor(aChild, false, false) != orig) {
bool transientExists = false;
bool isNewEntry = false;
auto* const transientReceivers =
Observer()
->mTransientReceivers
.LookupOrInsertWith(
aChild,
[&isNewEntry] {
isNewEntry = true;
return MakeUnique<nsCOMArray<nsMutationReceiver>>();
})
.get();
if (!isNewEntry) {
for (int32_t i = 0; i < transientReceivers->Count(); ++i) {
nsMutationReceiver* r = transientReceivers->ObjectAt(i);
if (r->GetParent() == orig) {
transientExists = true;
}
}
}
if (!transientExists) {
// Make sure the elements which are removed from the
// subtree are kept in the same observation set.
nsMutationReceiver* tr;
if (orig->Animations()) {
tr = nsAnimationReceiver::Create(aChild, orig);
} else {
tr = nsMutationReceiver::Create(aChild, orig);
}
transientReceivers->AppendObject(tr);
}
}
}
if (ChildList() && (Subtree() || parent == Target())) {
nsDOMMutationRecord* m = Observer()->CurrentRecord(nsGkAtoms::childList);
if (m->mTarget) {
// Already handled case.
return;
}
MOZ_ASSERT(parent);
m->mTarget = parent;
m->mRemovedNodes = new nsSimpleContentList(parent);
m->mRemovedNodes->AppendElement(aChild);
m->mPreviousSibling = aPreviousSibling;
m->mNextSibling = aPreviousSibling ? aPreviousSibling->GetNextSibling()
: parent->GetFirstChild();
}
// We need to schedule always, so that after microtask mTransientReceivers
// can be cleared correctly.
Observer()->ScheduleForRun();
}
void nsMutationReceiver::NodeWillBeDestroyed(nsINode* aNode) {
NS_ASSERTION(!mParent, "Shouldn't have mParent here!");
Disconnect(true);
}
void nsAnimationReceiver::RecordAnimationMutation(
Animation* aAnimation, AnimationMutation aMutationType) {
AnimationEffect* effect = aAnimation->GetEffect();
if (!effect) {
return;
}
KeyframeEffect* keyframeEffect = effect->AsKeyframeEffect();
if (!keyframeEffect) {
return;
}
NonOwningAnimationTarget animationTarget =
keyframeEffect->GetAnimationTarget();
if (!animationTarget) {
return;
}
Element* elem = animationTarget.mElement;
if (!Animations() || !(Subtree() || elem == Target()) ||
elem->ChromeOnlyAccess()) {
return;
}
// Record animations targeting to a pseudo element only when subtree is true.
if (animationTarget.mPseudoType != PseudoStyleType::NotPseudo && !Subtree()) {
return;
}
if (nsAutoAnimationMutationBatch::IsBatching()) {
switch (aMutationType) {
case eAnimationMutation_Added:
nsAutoAnimationMutationBatch::AnimationAdded(aAnimation, elem);
break;
case eAnimationMutation_Changed:
nsAutoAnimationMutationBatch::AnimationChanged(aAnimation, elem);
break;
case eAnimationMutation_Removed:
nsAutoAnimationMutationBatch::AnimationRemoved(aAnimation, elem);
break;
}
nsAutoAnimationMutationBatch::AddObserver(Observer());
return;
}
nsDOMMutationRecord* m = Observer()->CurrentRecord(nsGkAtoms::animations);
NS_ASSERTION(!m->mTarget, "Wrong target!");
m->mTarget = elem;
switch (aMutationType) {
case eAnimationMutation_Added:
m->mAddedAnimations.AppendElement(aAnimation);
break;
case eAnimationMutation_Changed:
m->mChangedAnimations.AppendElement(aAnimation);
break;
case eAnimationMutation_Removed:
m->mRemovedAnimations.AppendElement(aAnimation);
break;
}
}
void nsAnimationReceiver::AnimationAdded(Animation* aAnimation) {
RecordAnimationMutation(aAnimation, eAnimationMutation_Added);
}
void nsAnimationReceiver::AnimationChanged(Animation* aAnimation) {
RecordAnimationMutation(aAnimation, eAnimationMutation_Changed);
}
void nsAnimationReceiver::AnimationRemoved(Animation* aAnimation) {
RecordAnimationMutation(aAnimation, eAnimationMutation_Removed);
}
NS_IMPL_ISUPPORTS_INHERITED(nsAnimationReceiver, nsMutationReceiver,
nsIAnimationObserver)
// Observer
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMMutationObserver)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsDOMMutationObserver)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
for (int32_t i = 0; i < tmp->mReceivers.Count(); ++i) {
tmp->mReceivers[i]->Disconnect(false);
}
tmp->mReceivers.Clear();
tmp->ClearPendingRecords();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCallback)
// No need to handle mTransientReceivers
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMMutationObserver)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mReceivers)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFirstPendingMutation)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCallback)
// No need to handle mTransientReceivers
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
nsMutationReceiver* nsDOMMutationObserver::GetReceiverFor(
nsINode* aNode, bool aMayCreate, bool aWantsAnimations) {
MOZ_ASSERT(aMayCreate || !aWantsAnimations,
"the value of aWantsAnimations doesn't matter when aMayCreate is "
"false, so just pass in false for it");
if (!aMayCreate && !aNode->MayHaveDOMMutationObserver()) {
return nullptr;
}
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
if (mReceivers[i]->Target() == aNode) {
return mReceivers[i];
}
}
if (!aMayCreate) {
return nullptr;
}
nsMutationReceiver* r;
if (aWantsAnimations) {
r = nsAnimationReceiver::Create(aNode, this);
} else {
r = nsMutationReceiver::Create(aNode, this);
}
mReceivers.AppendObject(r);
return r;
}
void nsDOMMutationObserver::RemoveReceiver(nsMutationReceiver* aReceiver) {
mReceivers.RemoveObject(aReceiver);
}
void nsDOMMutationObserver::GetAllSubtreeObserversFor(
nsINode* aNode, nsTArray<nsMutationReceiver*>& aReceivers) {
nsINode* n = aNode;
while (n) {
if (n->MayHaveDOMMutationObserver()) {
nsMutationReceiver* r = GetReceiverFor(n, false, false);
if (r && r->Subtree() && !aReceivers.Contains(r)) {
aReceivers.AppendElement(r);
// If we've found all the receivers the observer has,
// no need to search for more.
if (mReceivers.Count() == int32_t(aReceivers.Length())) {
return;
}
}
nsCOMArray<nsMutationReceiver>* transientReceivers = nullptr;
if (mTransientReceivers.Get(n, &transientReceivers) &&
transientReceivers) {
for (int32_t i = 0; i < transientReceivers->Count(); ++i) {
nsMutationReceiver* r = transientReceivers->ObjectAt(i);
nsMutationReceiver* parent = r->GetParent();
if (r->Subtree() && parent && !aReceivers.Contains(parent)) {
aReceivers.AppendElement(parent);
}
}
if (mReceivers.Count() == int32_t(aReceivers.Length())) {
return;
}
}
}
n = n->GetParentNode();
}
}
void nsDOMMutationObserver::ScheduleForRun() {
nsDOMMutationObserver::AddCurrentlyHandlingObserver(this, sMutationLevel);
if (mWaitingForRun) {
return;
}
mWaitingForRun = true;
RescheduleForRun();
}
class MutationObserverMicroTask final : public MicroTaskRunnable {
public:
MOZ_CAN_RUN_SCRIPT
virtual void Run(AutoSlowOperation& aAso) override {
nsDOMMutationObserver::HandleMutations(aAso);
}
virtual bool Suppressed() override {
return nsDOMMutationObserver::AllScheduledMutationObserversAreSuppressed();
}
};
/* static */
void nsDOMMutationObserver::QueueMutationObserverMicroTask() {
CycleCollectedJSContext* ccjs = CycleCollectedJSContext::Get();
if (!ccjs) {
return;
}
RefPtr<MutationObserverMicroTask> momt = new MutationObserverMicroTask();
ccjs->DispatchToMicroTask(momt.forget());
}
void nsDOMMutationObserver::HandleMutations(mozilla::AutoSlowOperation& aAso) {
if (sScheduledMutationObservers || DocGroup::sPendingDocGroups) {
HandleMutationsInternal(aAso);
}
}
void nsDOMMutationObserver::RescheduleForRun() {
if (!sScheduledMutationObservers) {
CycleCollectedJSContext* ccjs = CycleCollectedJSContext::Get();
if (!ccjs) {
return;
}
RefPtr<MutationObserverMicroTask> momt = new MutationObserverMicroTask();
ccjs->DispatchToMicroTask(momt.forget());
sScheduledMutationObservers =
new AutoTArray<RefPtr<nsDOMMutationObserver>, 4>;
}
bool didInsert = false;
for (uint32_t i = 0; i < sScheduledMutationObservers->Length(); ++i) {
if (static_cast<nsDOMMutationObserver*>((*sScheduledMutationObservers)[i])
->mId > mId) {
sScheduledMutationObservers->InsertElementAt(i, this);
didInsert = true;
break;
}
}
if (!didInsert) {
sScheduledMutationObservers->AppendElement(this);
}
}
void nsDOMMutationObserver::Observe(nsINode& aTarget,
const MutationObserverInit& aOptions,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv) {
bool childList = aOptions.mChildList;
bool attributes =
aOptions.mAttributes.WasPassed() && aOptions.mAttributes.Value();
bool characterData =
aOptions.mCharacterData.WasPassed() && aOptions.mCharacterData.Value();
bool subtree = aOptions.mSubtree;
bool attributeOldValue = aOptions.mAttributeOldValue.WasPassed() &&
aOptions.mAttributeOldValue.Value();
bool characterDataOldValue = aOptions.mCharacterDataOldValue.WasPassed() &&
aOptions.mCharacterDataOldValue.Value();
bool animations = aOptions.mAnimations;
bool chromeOnlyNodes = aOptions.mChromeOnlyNodes;
if (!aOptions.mAttributes.WasPassed() &&
(aOptions.mAttributeOldValue.WasPassed() ||
aOptions.mAttributeFilter.WasPassed())) {
attributes = true;
}
if (!aOptions.mCharacterData.WasPassed() &&
aOptions.mCharacterDataOldValue.WasPassed()) {
characterData = true;
}
if (!(childList || attributes || characterData || animations)) {
aRv.ThrowTypeError(
"One of 'childList', 'attributes', 'characterData' must not be false.");
return;
}
if (aOptions.mAttributeOldValue.WasPassed() &&
aOptions.mAttributeOldValue.Value() && !attributes) {
aRv.ThrowTypeError(
"If 'attributeOldValue' is true, 'attributes' must not be false.");
return;
}
if (aOptions.mAttributeFilter.WasPassed() && !attributes) {
aRv.ThrowTypeError(
"If 'attributesFilter' is present, 'attributes' must not be false.");
return;
}
if (aOptions.mCharacterDataOldValue.WasPassed() &&
aOptions.mCharacterDataOldValue.Value() && !characterData) {
aRv.ThrowTypeError(
"If 'characterDataOldValue' is true, 'characterData' must not be "
"false.");
return;
}
nsTArray<RefPtr<nsAtom>> filters;
bool allAttrs = true;
if (aOptions.mAttributeFilter.WasPassed()) {
allAttrs = false;
const Sequence<nsString>& filtersAsString =
aOptions.mAttributeFilter.Value();
uint32_t len = filtersAsString.Length();
filters.SetCapacity(len);
for (uint32_t i = 0; i < len; ++i) {
filters.AppendElement(NS_Atomize(filtersAsString[i]));
}
}
nsMutationReceiver* r = GetReceiverFor(&aTarget, true, animations);
r->SetChildList(childList);
r->SetAttributes(attributes);
r->SetCharacterData(characterData);
r->SetSubtree(subtree);
r->SetAttributeOldValue(attributeOldValue);
r->SetCharacterDataOldValue(characterDataOldValue);
r->SetAttributeFilter(std::move(filters));
r->SetAllAttributes(allAttrs);
r->SetAnimations(animations);
r->SetChromeOnlyNodes(chromeOnlyNodes);
r->RemoveClones();
if (!aSubjectPrincipal.IsSystemPrincipal() &&
!aSubjectPrincipal.GetIsAddonOrExpandedAddonPrincipal()) {
if (nsPIDOMWindowInner* window = aTarget.OwnerDoc()->GetInnerWindow()) {
window->SetMutationObserverHasObservedNodeForTelemetry();
}
}
#ifdef DEBUG
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
NS_WARNING_ASSERTION(mReceivers[i]->Target(),
"All the receivers should have a target!");
}
#endif
}
void nsDOMMutationObserver::Disconnect() {
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
mReceivers[i]->Disconnect(false);
}
mReceivers.Clear();
mCurrentMutations.Clear();
ClearPendingRecords();
}
void nsDOMMutationObserver::TakeRecords(
nsTArray<RefPtr<nsDOMMutationRecord>>& aRetVal) {
aRetVal.Clear();
aRetVal.SetCapacity(mPendingMutationCount);
RefPtr<nsDOMMutationRecord> current;
current.swap(mFirstPendingMutation);
for (uint32_t i = 0; i < mPendingMutationCount; ++i) {
RefPtr<nsDOMMutationRecord> next;
current->mNext.swap(next);
if (!mMergeAttributeRecords ||
!MergeableAttributeRecord(aRetVal.SafeLastElement(nullptr), current)) {
*aRetVal.AppendElement() = std::move(current);
}
current.swap(next);
}
ClearPendingRecords();
}
void nsDOMMutationObserver::GetObservingInfo(
nsTArray<Nullable<MutationObservingInfo>>& aResult,
mozilla::ErrorResult& aRv) {
aResult.SetCapacity(mReceivers.Count());
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
MutationObservingInfo& info = aResult.AppendElement()->SetValue();
nsMutationReceiver* mr = mReceivers[i];
info.mChildList = mr->ChildList();
info.mAttributes.Construct(mr->Attributes());
info.mCharacterData.Construct(mr->CharacterData());
info.mSubtree = mr->Subtree();
info.mAttributeOldValue.Construct(mr->AttributeOldValue());
info.mCharacterDataOldValue.Construct(mr->CharacterDataOldValue());
info.mAnimations = mr->Animations();
nsTArray<RefPtr<nsAtom>>& filters = mr->AttributeFilter();
if (filters.Length()) {
info.mAttributeFilter.Construct();
Sequence<nsString>& filtersAsStrings = info.mAttributeFilter.Value();
nsString* strings =
filtersAsStrings.AppendElements(filters.Length(), mozilla::fallible);
if (!strings) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
for (size_t j = 0; j < filters.Length(); ++j) {
filters[j]->ToString(strings[j]);
}
}
info.mObservedNode = mr->Target();
}
}
// static
already_AddRefed<nsDOMMutationObserver> nsDOMMutationObserver::Constructor(
const GlobalObject& aGlobal, dom::MutationCallback& aCb, ErrorResult& aRv) {
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(aGlobal.GetAsSupports());
if (!window) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
return MakeAndAddRef<nsDOMMutationObserver>(std::move(window), aCb);
}
bool nsDOMMutationObserver::MergeableAttributeRecord(
nsDOMMutationRecord* aOldRecord, nsDOMMutationRecord* aRecord) {
MOZ_ASSERT(mMergeAttributeRecords);
return aOldRecord && aOldRecord->mType == nsGkAtoms::attributes &&
aOldRecord->mType == aRecord->mType &&
aOldRecord->mTarget == aRecord->mTarget &&
aOldRecord->mAttrName == aRecord->mAttrName &&
aOldRecord->mAttrNamespace.Equals(aRecord->mAttrNamespace);
}
void nsDOMMutationObserver::HandleMutation() {
NS_ASSERTION(nsContentUtils::IsSafeToRunScript(), "Whaat!");
NS_ASSERTION(mCurrentMutations.IsEmpty(),
"Still generating MutationRecords?");
mWaitingForRun = false;
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
mReceivers[i]->RemoveClones();
}
mTransientReceivers.Clear();
nsPIDOMWindowOuter* outer = mOwner->GetOuterWindow();
if (!mPendingMutationCount || !outer ||
outer->GetCurrentInnerWindow() != mOwner) {
ClearPendingRecords();
return;
}
mozilla::dom::Sequence<mozilla::OwningNonNull<nsDOMMutationRecord>> mutations;
if (mutations.SetCapacity(mPendingMutationCount, mozilla::fallible)) {
// We can't use TakeRecords easily here, because it deals with a
// different type of array, and we want to optimize out any extra copying.
RefPtr<nsDOMMutationRecord> current;
current.swap(mFirstPendingMutation);
for (uint32_t i = 0; i < mPendingMutationCount; ++i) {
RefPtr<nsDOMMutationRecord> next;
current->mNext.swap(next);
if (!mMergeAttributeRecords ||
!MergeableAttributeRecord(
mutations.Length() ? mutations.LastElement().get() : nullptr,
current)) {
*mutations.AppendElement(mozilla::fallible) = current;
}
current.swap(next);
}
}
ClearPendingRecords();
RefPtr<dom::MutationCallback> callback(mCallback);
callback->Call(this, mutations, *this);
}
void nsDOMMutationObserver::HandleMutationsInternal(AutoSlowOperation& aAso) {
nsTArray<RefPtr<nsDOMMutationObserver>>* suppressedObservers = nullptr;
// This loop implements:
// * Let signalList be a copy of unit of related similar-origin browsing
// contexts' signal slot list.
// * Empty unit of related similar-origin browsing contexts' signal slot
// list.
nsTArray<nsTArray<RefPtr<HTMLSlotElement>>> signalLists;
if (DocGroup::sPendingDocGroups) {
signalLists.SetCapacity(DocGroup::sPendingDocGroups->Length());
for (DocGroup* docGroup : *DocGroup::sPendingDocGroups) {
signalLists.AppendElement(docGroup->MoveSignalSlotList());
}
delete DocGroup::sPendingDocGroups;
DocGroup::sPendingDocGroups = nullptr;
}
if (sScheduledMutationObservers) {
AutoTArray<RefPtr<nsDOMMutationObserver>, 4>* observers =
sScheduledMutationObservers;
sScheduledMutationObservers = nullptr;
for (uint32_t i = 0; i < observers->Length(); ++i) {
RefPtr<nsDOMMutationObserver> currentObserver =
static_cast<nsDOMMutationObserver*>((*observers)[i]);
if (!currentObserver->Suppressed()) {
currentObserver->HandleMutation();
} else {
if (!suppressedObservers) {
suppressedObservers = new nsTArray<RefPtr<nsDOMMutationObserver>>;
}
if (!suppressedObservers->Contains(currentObserver)) {
suppressedObservers->AppendElement(currentObserver);
}
}
}
delete observers;
aAso.CheckForInterrupt();
}
if (suppressedObservers) {
for (uint32_t i = 0; i < suppressedObservers->Length(); ++i) {
static_cast<nsDOMMutationObserver*>(suppressedObservers->ElementAt(i))
->RescheduleForRun();
}
delete suppressedObservers;
suppressedObservers = nullptr;
}
// Fire slotchange event for each slot in signalLists.
for (const nsTArray<RefPtr<HTMLSlotElement>>& signalList : signalLists) {
for (const RefPtr<HTMLSlotElement>& signal : signalList) {
signal->FireSlotChangeEvent();
}
}
}
nsDOMMutationRecord* nsDOMMutationObserver::CurrentRecord(nsAtom* aType) {
NS_ASSERTION(sMutationLevel > 0, "Unexpected mutation level!");
while (mCurrentMutations.Length() < sMutationLevel) {
mCurrentMutations.AppendElement(static_cast<nsDOMMutationRecord*>(nullptr));
}
uint32_t last = sMutationLevel - 1;
if (!mCurrentMutations[last]) {
RefPtr<nsDOMMutationRecord> r =
new nsDOMMutationRecord(aType, GetParentObject());
mCurrentMutations[last] = r;
AppendMutationRecord(r.forget());
ScheduleForRun();
}
#ifdef DEBUG
MOZ_ASSERT(sCurrentlyHandlingObservers->Length() == sMutationLevel);
for (size_t i = 0; i < sCurrentlyHandlingObservers->Length(); ++i) {
MOZ_ASSERT(sCurrentlyHandlingObservers->ElementAt(i).Contains(this),
"MutationObserver should be added as an observer of all the "
"nested mutations!");
}
#endif
NS_ASSERTION(mCurrentMutations[last]->mType == aType,
"Unexpected MutationRecord type!");
return mCurrentMutations[last];
}
nsDOMMutationObserver::~nsDOMMutationObserver() {
for (int32_t i = 0; i < mReceivers.Count(); ++i) {
mReceivers[i]->RemoveClones();
}
}
void nsDOMMutationObserver::EnterMutationHandling() { ++sMutationLevel; }
// Leave the current mutation level (there can be several levels if in case
// of nested calls to the nsIMutationObserver methods).
// The most recent mutation record is removed from mCurrentMutations, so
// that is doesn't get modified anymore by receivers.
void nsDOMMutationObserver::LeaveMutationHandling() {
if (sCurrentlyHandlingObservers &&
sCurrentlyHandlingObservers->Length() == sMutationLevel) {
nsTArray<RefPtr<nsDOMMutationObserver>> obs =
sCurrentlyHandlingObservers->PopLastElement();
for (uint32_t i = 0; i < obs.Length(); ++i) {
nsDOMMutationObserver* o = static_cast<nsDOMMutationObserver*>(obs[i]);
if (o->mCurrentMutations.Length() == sMutationLevel) {
// It is already in pending mutations.
o->mCurrentMutations.RemoveLastElement();
}
}
}
--sMutationLevel;
}
void nsDOMMutationObserver::AddCurrentlyHandlingObserver(
nsDOMMutationObserver* aObserver, uint32_t aMutationLevel) {
NS_ASSERTION(aMutationLevel > 0, "Unexpected mutation level!");
if (aMutationLevel > 1) {
// MutationObserver must be in the currently handling observer list
// in all the nested levels.
AddCurrentlyHandlingObserver(aObserver, aMutationLevel - 1);
}
if (!sCurrentlyHandlingObservers) {
sCurrentlyHandlingObservers =
new AutoTArray<AutoTArray<RefPtr<nsDOMMutationObserver>, 4>, 4>;
}
while (sCurrentlyHandlingObservers->Length() < aMutationLevel) {
sCurrentlyHandlingObservers->InsertElementAt(
sCurrentlyHandlingObservers->Length());
}
uint32_t index = aMutationLevel - 1;
if (!sCurrentlyHandlingObservers->ElementAt(index).Contains(aObserver)) {
sCurrentlyHandlingObservers->ElementAt(index).AppendElement(aObserver);
}
}
void nsDOMMutationObserver::Shutdown() {
delete sCurrentlyHandlingObservers;
sCurrentlyHandlingObservers = nullptr;
delete sScheduledMutationObservers;
sScheduledMutationObservers = nullptr;
}
nsAutoMutationBatch* nsAutoMutationBatch::sCurrentBatch = nullptr;
void nsAutoMutationBatch::Done() {
if (sCurrentBatch != this) {
return;
}
sCurrentBatch = mPreviousBatch;
if (mObservers.IsEmpty()) {
nsDOMMutationObserver::LeaveMutationHandling();
// Nothing to do.
return;
}
uint32_t len = mObservers.Length();
for (uint32_t i = 0; i < len; ++i) {
nsDOMMutationObserver* ob = mObservers[i].mObserver;
bool wantsChildList = mObservers[i].mWantsChildList;
RefPtr<nsSimpleContentList> removedList;
if (wantsChildList) {
removedList = new nsSimpleContentList(mBatchTarget);
}
nsTArray<nsMutationReceiver*> allObservers;
ob->GetAllSubtreeObserversFor(mBatchTarget, allObservers);
int32_t j = mFromFirstToLast ? 0 : mRemovedNodes.Length() - 1;
int32_t end = mFromFirstToLast ? mRemovedNodes.Length() : -1;
for (; j != end; mFromFirstToLast ? ++j : --j) {
nsCOMPtr<nsIContent> removed = mRemovedNodes[j];
if (removedList) {
removedList->AppendElement(removed);
}
if (allObservers.Length()) {
auto* const transientReceivers =
ob->mTransientReceivers.GetOrInsertNew(removed);
for (uint32_t k = 0; k < allObservers.Length(); ++k) {
nsMutationReceiver* r = allObservers[k];
nsMutationReceiver* orig = r->GetParent() ? r->GetParent() : r;
if (ob->GetReceiverFor(removed, false, false) != orig) {
// Make sure the elements which are removed from the
// subtree are kept in the same observation set.
nsMutationReceiver* tr;
if (orig->Animations()) {
tr = nsAnimationReceiver::Create(removed, orig);
} else {
tr = nsMutationReceiver::Create(removed, orig);
}
transientReceivers->AppendObject(tr);
}
}
}
}
if (wantsChildList && (mRemovedNodes.Length() || mAddedNodes.Length())) {
RefPtr<nsSimpleContentList> addedList =
new nsSimpleContentList(mBatchTarget);
for (uint32_t i = 0; i < mAddedNodes.Length(); ++i) {
addedList->AppendElement(mAddedNodes[i]);
}
RefPtr<nsDOMMutationRecord> m =
new nsDOMMutationRecord(nsGkAtoms::childList, ob->GetParentObject());
m->mTarget = mBatchTarget;
m->mRemovedNodes = removedList;
m->mAddedNodes = addedList;
m->mPreviousSibling = mPrevSibling;
m->mNextSibling = mNextSibling;
ob->AppendMutationRecord(m.forget());
}
// Always schedule the observer so that transient receivers are
// removed correctly.
ob->ScheduleForRun();
}
nsDOMMutationObserver::LeaveMutationHandling();
}
nsAutoAnimationMutationBatch* nsAutoAnimationMutationBatch::sCurrentBatch =
nullptr;
void nsAutoAnimationMutationBatch::Done() {
if (sCurrentBatch != this) {
return;
}
sCurrentBatch = nullptr;
if (mObservers.IsEmpty()) {
nsDOMMutationObserver::LeaveMutationHandling();
// Nothing to do.
return;
}
mBatchTargets.Sort(TreeOrderComparator());
for (nsDOMMutationObserver* ob : mObservers) {
bool didAddRecords = false;
for (nsINode* target : mBatchTargets) {
EntryArray* entries = mEntryTable.Get(target);
MOZ_ASSERT(entries,
"Targets in entry table and targets list should match");
RefPtr<nsDOMMutationRecord> m =
new nsDOMMutationRecord(nsGkAtoms::animations, ob->GetParentObject());
m->mTarget = target;
for (const Entry& e : *entries) {
if (e.mState == eState_Added) {
m->mAddedAnimations.AppendElement(e.mAnimation);
} else if (e.mState == eState_Removed) {
m->mRemovedAnimations.AppendElement(e.mAnimation);
} else if (e.mState == eState_RemainedPresent && e.mChanged) {
m->mChangedAnimations.AppendElement(e.mAnimation);
}
}
if (!m->mAddedAnimations.IsEmpty() || !m->mChangedAnimations.IsEmpty() ||
!m->mRemovedAnimations.IsEmpty()) {
ob->AppendMutationRecord(m.forget());
didAddRecords = true;
}
}
if (didAddRecords) {
ob->ScheduleForRun();
}
}
nsDOMMutationObserver::LeaveMutationHandling();
}
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