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gecko-dev/dom/base/CharacterData.cpp
Emilio Cobos Álvarez 3efe2b6ed0 Bug 1554498 - Don't use nsIMutationObserver for ShadowRoot. r=smaug 
This penalizes a bit non-shadow-DOM content, in exchange of making Shadow DOM
slightly faster as well.

The biggest advantage of this is that all ContentRemoved notifications would see
the flattened tree before the changes, which is something a11y needs to be
correct.

XBL would still not be handled right by a11y, but that's not new and content
cannot do random stuff with XBL so it's not too bad.

Differential Revision: https://phabricator.services.mozilla.com/D32639

--HG--
extra : moz-landing-system : lando
2019-08-27 22:10:46 +00:00

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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 DOM Core's Comment, DocumentType, Text,
* CDATASection and ProcessingInstruction nodes.
*/
#include "mozilla/dom/CharacterData.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/BindContext.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/Document.h"
#include "nsReadableUtils.h"
#include "mozilla/InternalMutationEvent.h"
#include "nsIURI.h"
#include "nsCOMPtr.h"
#include "nsDOMString.h"
#include "nsChangeHint.h"
#include "nsCOMArray.h"
#include "nsNodeUtils.h"
#include "mozilla/dom/DirectionalityUtils.h"
#include "nsBindingManager.h"
#include "nsCCUncollectableMarker.h"
#include "mozAutoDocUpdate.h"
#include "nsTextNode.h"
#include "nsBidiUtils.h"
#include "PLDHashTable.h"
#include "mozilla/Sprintf.h"
#include "nsWindowSizes.h"
#include "nsWrapperCacheInlines.h"
#if defined(ACCESSIBILITY) && defined(DEBUG)
# include "nsAccessibilityService.h"
#endif
namespace mozilla {
namespace dom {
CharacterData::CharacterData(already_AddRefed<dom::NodeInfo>&& aNodeInfo)
: nsIContent(std::move(aNodeInfo)) {
MOZ_ASSERT(mNodeInfo->NodeType() == TEXT_NODE ||
mNodeInfo->NodeType() == CDATA_SECTION_NODE ||
mNodeInfo->NodeType() == COMMENT_NODE ||
mNodeInfo->NodeType() == PROCESSING_INSTRUCTION_NODE ||
mNodeInfo->NodeType() == DOCUMENT_TYPE_NODE,
"Bad NodeType in aNodeInfo");
}
CharacterData::~CharacterData() {
MOZ_ASSERT(!IsInUncomposedDoc(),
"Please remove this from the document properly");
if (GetParent()) {
NS_RELEASE(mParent);
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(CharacterData)
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(CharacterData)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(CharacterData)
return Element::CanSkip(tmp, aRemovingAllowed);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(CharacterData)
return Element::CanSkipInCC(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(CharacterData)
return Element::CanSkipThis(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
// We purposefully don't TRAVERSE_BEGIN_INHERITED here. All the bits
// we should traverse should be added here or in nsINode::Traverse.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(CharacterData)
if (MOZ_UNLIKELY(cb.WantDebugInfo())) {
char name[40];
SprintfLiteral(name, "CharacterData (len=%d)", tmp->mText.GetLength());
cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name);
} else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(CharacterData, tmp->mRefCnt.get())
}
if (!nsIContent::Traverse(tmp, cb)) {
return NS_SUCCESS_INTERRUPTED_TRAVERSE;
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
// We purposefully don't UNLINK_BEGIN_INHERITED here.
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CharacterData)
nsIContent::Unlink(tmp);
if (nsContentSlots* slots = tmp->GetExistingContentSlots()) {
slots->Unlink();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN(CharacterData)
NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(CharacterData)
NS_INTERFACE_MAP_END_INHERITING(nsIContent)
void CharacterData::GetNodeValueInternal(nsAString& aNodeValue) {
GetData(aNodeValue);
}
void CharacterData::SetNodeValueInternal(const nsAString& aNodeValue,
ErrorResult& aError) {
aError = SetTextInternal(0, mText.GetLength(), aNodeValue.BeginReading(),
aNodeValue.Length(), true);
}
//----------------------------------------------------------------------
// Implementation of CharacterData
void CharacterData::GetData(nsAString& aData) const {
if (mText.Is2b()) {
aData.Truncate();
mText.AppendTo(aData);
} else {
// Must use Substring() since nsDependentCString() requires null
// terminated strings.
const char* data = mText.Get1b();
if (data) {
CopyASCIItoUTF16(Substring(data, data + mText.GetLength()), aData);
} else {
aData.Truncate();
}
}
}
void CharacterData::SetData(const nsAString& aData, ErrorResult& aRv) {
nsresult rv = SetTextInternal(0, mText.GetLength(), aData.BeginReading(),
aData.Length(), true);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
void CharacterData::SubstringData(uint32_t aStart, uint32_t aCount,
nsAString& aReturn, ErrorResult& rv) {
aReturn.Truncate();
uint32_t textLength = mText.GetLength();
if (aStart > textLength) {
rv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
uint32_t amount = aCount;
if (amount > textLength - aStart) {
amount = textLength - aStart;
}
if (mText.Is2b()) {
aReturn.Assign(mText.Get2b() + aStart, amount);
} else {
// Must use Substring() since nsDependentCString() requires null
// terminated strings.
const char* data = mText.Get1b() + aStart;
CopyASCIItoUTF16(Substring(data, data + amount), aReturn);
}
}
//----------------------------------------------------------------------
void CharacterData::AppendData(const nsAString& aData, ErrorResult& aRv) {
InsertData(mText.GetLength(), aData, aRv);
}
void CharacterData::InsertData(uint32_t aOffset, const nsAString& aData,
ErrorResult& aRv) {
nsresult rv =
SetTextInternal(aOffset, 0, aData.BeginReading(), aData.Length(), true);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
void CharacterData::DeleteData(uint32_t aOffset, uint32_t aCount,
ErrorResult& aRv) {
nsresult rv = SetTextInternal(aOffset, aCount, nullptr, 0, true);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
void CharacterData::ReplaceData(uint32_t aOffset, uint32_t aCount,
const nsAString& aData, ErrorResult& aRv) {
nsresult rv = SetTextInternal(aOffset, aCount, aData.BeginReading(),
aData.Length(), true);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
}
nsresult CharacterData::SetTextInternal(
uint32_t aOffset, uint32_t aCount, const char16_t* aBuffer,
uint32_t aLength, bool aNotify,
CharacterDataChangeInfo::Details* aDetails) {
MOZ_ASSERT(aBuffer || !aLength, "Null buffer passed to SetTextInternal!");
// sanitize arguments
uint32_t textLength = mText.GetLength();
if (aOffset > textLength) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
if (aCount > textLength - aOffset) {
aCount = textLength - aOffset;
}
uint32_t endOffset = aOffset + aCount;
// Make sure the text fragment can hold the new data.
if (aLength > aCount && !mText.CanGrowBy(aLength - aCount)) {
return NS_ERROR_OUT_OF_MEMORY;
}
Document* document = GetComposedDoc();
mozAutoDocUpdate updateBatch(document, aNotify);
bool haveMutationListeners =
aNotify && nsContentUtils::HasMutationListeners(
this, NS_EVENT_BITS_MUTATION_CHARACTERDATAMODIFIED, this);
RefPtr<nsAtom> oldValue;
if (haveMutationListeners) {
oldValue = GetCurrentValueAtom();
}
if (aNotify) {
CharacterDataChangeInfo info = {aOffset == textLength, aOffset, endOffset,
aLength, aDetails};
nsNodeUtils::CharacterDataWillChange(this, info);
}
Directionality oldDir = eDir_NotSet;
bool dirAffectsAncestor =
(NodeType() == TEXT_NODE &&
TextNodeWillChangeDirection(static_cast<nsTextNode*>(this), &oldDir,
aOffset));
if (aOffset == 0 && endOffset == textLength) {
// Replacing whole text or old text was empty. Don't bother to check for
// bidi in this string if the document already has bidi enabled.
// If this is marked as "maybe modified frequently", the text should be
// stored as char16_t since converting char* to char16_t* is expensive.
bool ok =
mText.SetTo(aBuffer, aLength, !document || !document->GetBidiEnabled(),
HasFlag(NS_MAYBE_MODIFIED_FREQUENTLY));
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
} else if (aOffset == textLength) {
// Appending to existing
bool ok =
mText.Append(aBuffer, aLength, !document || !document->GetBidiEnabled(),
HasFlag(NS_MAYBE_MODIFIED_FREQUENTLY));
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
} else {
// Merging old and new
bool bidi = mText.IsBidi();
// Allocate new buffer
int32_t newLength = textLength - aCount + aLength;
// Use nsString and not nsAutoString so that we get a nsStringBuffer which
// can be just AddRefed in nsTextFragment.
nsString to;
to.SetCapacity(newLength);
// Copy over appropriate data
if (aOffset) {
mText.AppendTo(to, 0, aOffset);
}
if (aLength) {
to.Append(aBuffer, aLength);
if (!bidi && (!document || !document->GetBidiEnabled())) {
bidi = HasRTLChars(MakeSpan(aBuffer, aLength));
}
}
if (endOffset != textLength) {
mText.AppendTo(to, endOffset, textLength - endOffset);
}
// If this is marked as "maybe modified frequently", the text should be
// stored as char16_t since converting char* to char16_t* is expensive.
// Use char16_t also when we have bidi characters.
bool use2b = HasFlag(NS_MAYBE_MODIFIED_FREQUENTLY) || bidi;
bool ok = mText.SetTo(to, false, use2b);
mText.SetBidi(bidi);
NS_ENSURE_TRUE(ok, NS_ERROR_OUT_OF_MEMORY);
}
UnsetFlags(NS_CACHED_TEXT_IS_ONLY_WHITESPACE);
if (document && mText.IsBidi()) {
// If we found bidi characters in mText.SetTo() above, indicate that the
// document contains bidi characters.
document->SetBidiEnabled();
}
if (dirAffectsAncestor) {
// dirAffectsAncestor being true implies that we have a text node, see
// above.
MOZ_ASSERT(NodeType() == TEXT_NODE);
TextNodeChangedDirection(static_cast<nsTextNode*>(this), oldDir, aNotify);
}
// Notify observers
if (aNotify) {
CharacterDataChangeInfo info = {aOffset == textLength, aOffset, endOffset,
aLength, aDetails};
nsNodeUtils::CharacterDataChanged(this, info);
if (haveMutationListeners) {
InternalMutationEvent mutation(true, eLegacyCharacterDataModified);
mutation.mPrevAttrValue = oldValue;
if (aLength > 0) {
nsAutoString val;
mText.AppendTo(val);
mutation.mNewAttrValue = NS_Atomize(val);
}
mozAutoSubtreeModified subtree(OwnerDoc(), this);
(new AsyncEventDispatcher(this, mutation))->RunDOMEventWhenSafe();
}
}
return NS_OK;
}
//----------------------------------------------------------------------
// Implementation of nsIContent
#ifdef DEBUG
void CharacterData::ToCString(nsAString& aBuf, int32_t aOffset,
int32_t aLen) const {
if (mText.Is2b()) {
const char16_t* cp = mText.Get2b() + aOffset;
const char16_t* end = cp + aLen;
while (cp < end) {
char16_t ch = *cp++;
if (ch == '&') {
aBuf.AppendLiteral("&amp;");
} else if (ch == '<') {
aBuf.AppendLiteral("&lt;");
} else if (ch == '>') {
aBuf.AppendLiteral("&gt;");
} else if ((ch < ' ') || (ch >= 127)) {
aBuf.AppendPrintf("\\u%04x", ch);
} else {
aBuf.Append(ch);
}
}
} else {
unsigned char* cp = (unsigned char*)mText.Get1b() + aOffset;
const unsigned char* end = cp + aLen;
while (cp < end) {
char16_t ch = *cp++;
if (ch == '&') {
aBuf.AppendLiteral("&amp;");
} else if (ch == '<') {
aBuf.AppendLiteral("&lt;");
} else if (ch == '>') {
aBuf.AppendLiteral("&gt;");
} else if ((ch < ' ') || (ch >= 127)) {
aBuf.AppendPrintf("\\u%04x", ch);
} else {
aBuf.Append(ch);
}
}
}
}
#endif
nsresult CharacterData::BindToTree(BindContext& aContext, nsINode& aParent) {
MOZ_ASSERT(aParent.IsContent() || aParent.IsDocument(),
"Must have content or document parent!");
MOZ_ASSERT(aParent.OwnerDoc() == OwnerDoc(),
"Must have the same owner document");
MOZ_ASSERT(OwnerDoc() == &aContext.OwnerDoc(), "These should match too");
MOZ_ASSERT(!IsInUncomposedDoc(), "Already have a document. Unbind first!");
MOZ_ASSERT(!IsInComposedDoc(), "Already have a document. Unbind first!");
// Note that as we recurse into the kids, they'll have a non-null parent. So
// only assert if our parent is _changing_ while we have a parent.
MOZ_ASSERT(!GetParentNode() || &aParent == GetParentNode(),
"Already have a parent. Unbind first!");
MOZ_ASSERT(
!GetBindingParent() ||
aContext.GetBindingParent() == GetBindingParent() ||
(!aContext.GetBindingParent() && aParent.IsContent() &&
aParent.AsContent()->GetBindingParent() == GetBindingParent()),
"Already have a binding parent. Unbind first!");
MOZ_ASSERT(!IsRootOfNativeAnonymousSubtree() ||
aContext.GetBindingParent() == &aParent,
"Native anonymous content must have its parent as its "
"own binding parent");
MOZ_ASSERT(aContext.GetBindingParent() || !aParent.IsContent() ||
aContext.GetBindingParent() ==
aParent.AsContent()->GetBindingParent(),
"We should be passed the right binding parent");
// First set the binding parent
if (Element* bindingParent = aContext.GetBindingParent()) {
ExtendedContentSlots()->mBindingParent = bindingParent;
}
const bool hadParent = !!GetParentNode();
NS_ASSERTION(!aContext.GetBindingParent() ||
IsRootOfNativeAnonymousSubtree() ||
!HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE) ||
aParent.IsInNativeAnonymousSubtree(),
"Trying to re-bind content from native anonymous subtree to "
"non-native anonymous parent!");
if (aParent.IsInNativeAnonymousSubtree()) {
SetFlags(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE);
}
if (aParent.HasFlag(NODE_HAS_BEEN_IN_UA_WIDGET)) {
SetFlags(NODE_HAS_BEEN_IN_UA_WIDGET);
}
if (HasFlag(NODE_IS_ANONYMOUS_ROOT)) {
aParent.SetMayHaveAnonymousChildren();
}
// Set parent
mParent = &aParent;
if (!hadParent && aParent.IsContent()) {
SetParentIsContent(true);
NS_ADDREF(mParent);
}
MOZ_ASSERT(!!GetParent() == aParent.IsContent());
if (aParent.IsInUncomposedDoc() || aParent.IsInShadowTree()) {
// We no longer need to track the subtree pointer (and in fact we'll assert
// if we do this any later).
ClearSubtreeRootPointer();
SetIsConnected(aParent.IsInComposedDoc());
if (aParent.IsInUncomposedDoc()) {
SetIsInDocument();
} else {
SetFlags(NODE_IS_IN_SHADOW_TREE);
MOZ_ASSERT(aParent.IsContent() &&
aParent.AsContent()->GetContainingShadow());
ExtendedContentSlots()->mContainingShadow =
aParent.AsContent()->GetContainingShadow();
}
if (IsInComposedDoc()) {
if (mText.IsBidi()) {
aContext.OwnerDoc().SetBidiEnabled();
}
if (aContext.CollectingDisplayedNodeDataDuringLoad()) {
aContext.OwnerDoc().AddToVisibleContentHeuristic(mText.GetLength());
}
}
// Clear the lazy frame construction bits.
UnsetFlags(NODE_NEEDS_FRAME | NODE_DESCENDANTS_NEED_FRAMES);
} else {
// If we're not in the doc and not in a shadow tree,
// update our subtree pointer.
SetSubtreeRootPointer(aParent.SubtreeRoot());
}
nsNodeUtils::ParentChainChanged(this);
if (!hadParent && IsRootOfNativeAnonymousSubtree()) {
nsNodeUtils::NativeAnonymousChildListChange(this, false);
}
UpdateEditableState(false);
// Ensure we only do these once, in the case we move the shadow host around.
if (aContext.SubtreeRootChanges()) {
HandleShadowDOMRelatedInsertionSteps(hadParent);
}
MOZ_ASSERT(OwnerDoc() == aParent.OwnerDoc(), "Bound to wrong document");
MOZ_ASSERT(IsInComposedDoc() == aContext.InComposedDoc());
MOZ_ASSERT(IsInUncomposedDoc() == aContext.InUncomposedDoc());
MOZ_ASSERT(&aParent == GetParentNode(), "Bound to wrong parent node");
MOZ_ASSERT(aContext.GetBindingParent() == GetBindingParent(),
"Bound to wrong binding parent");
MOZ_ASSERT(aParent.IsInUncomposedDoc() == IsInUncomposedDoc());
MOZ_ASSERT(aParent.IsInComposedDoc() == IsInComposedDoc());
MOZ_ASSERT(aParent.IsInShadowTree() == IsInShadowTree());
MOZ_ASSERT(aParent.SubtreeRoot() == SubtreeRoot());
return NS_OK;
}
void CharacterData::UnbindFromTree(bool aNullParent) {
// Unset frame flags; if we need them again later, they'll get set again.
UnsetFlags(NS_CREATE_FRAME_IF_NON_WHITESPACE | NS_REFRAME_IF_WHITESPACE);
HandleShadowDOMRelatedRemovalSteps(aNullParent);
Document* document = GetComposedDoc();
if (aNullParent) {
if (IsRootOfNativeAnonymousSubtree()) {
nsNodeUtils::NativeAnonymousChildListChange(this, true);
}
if (GetParent()) {
NS_RELEASE(mParent);
} else {
mParent = nullptr;
}
SetParentIsContent(false);
}
ClearInDocument();
SetIsConnected(false);
if (aNullParent || !mParent->IsInShadowTree()) {
UnsetFlags(NODE_IS_IN_SHADOW_TREE);
// Begin keeping track of our subtree root.
SetSubtreeRootPointer(aNullParent ? this : mParent->SubtreeRoot());
}
if (document && !GetContainingShadow()) {
// Notify XBL- & nsIAnonymousContentCreator-generated
// anonymous content that the document is changing.
// Unlike XBL, bindings for web components shadow DOM
// do not get uninstalled.
if (HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
nsContentUtils::AddScriptRunner(new RemoveFromBindingManagerRunnable(
document->BindingManager(), this, document));
}
}
nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
if (slots) {
slots->mBindingParent = nullptr;
if (aNullParent || !mParent->IsInShadowTree()) {
slots->mContainingShadow = nullptr;
}
}
nsNodeUtils::ParentChainChanged(this);
#if defined(ACCESSIBILITY) && defined(DEBUG)
MOZ_ASSERT(!GetAccService() || !GetAccService()->HasAccessible(this),
"An accessible for this element still exists!");
#endif
}
//----------------------------------------------------------------------
// Implementation of the nsIContent interface text functions
nsresult CharacterData::SetText(const char16_t* aBuffer, uint32_t aLength,
bool aNotify) {
return SetTextInternal(0, mText.GetLength(), aBuffer, aLength, aNotify);
}
nsresult CharacterData::AppendText(const char16_t* aBuffer, uint32_t aLength,
bool aNotify) {
return SetTextInternal(mText.GetLength(), 0, aBuffer, aLength, aNotify);
}
bool CharacterData::TextIsOnlyWhitespace() {
MOZ_ASSERT(NS_IsMainThread());
if (!ThreadSafeTextIsOnlyWhitespace()) {
UnsetFlags(NS_TEXT_IS_ONLY_WHITESPACE);
SetFlags(NS_CACHED_TEXT_IS_ONLY_WHITESPACE);
return false;
}
SetFlags(NS_CACHED_TEXT_IS_ONLY_WHITESPACE | NS_TEXT_IS_ONLY_WHITESPACE);
return true;
}
bool CharacterData::ThreadSafeTextIsOnlyWhitespace() const {
// FIXME: should this method take content language into account?
if (mText.Is2b()) {
// The fragment contains non-8bit characters and such characters
// are never considered whitespace.
//
// FIXME(emilio): This is not quite true in presence of the
// NS_MAYBE_MODIFIED_FREQUENTLY flag... But looks like we only set that on
// anonymous nodes, so should be fine...
return false;
}
if (HasFlag(NS_CACHED_TEXT_IS_ONLY_WHITESPACE)) {
return HasFlag(NS_TEXT_IS_ONLY_WHITESPACE);
}
const char* cp = mText.Get1b();
const char* end = cp + mText.GetLength();
while (cp < end) {
char ch = *cp;
// NOTE(emilio): If you ever change the definition of "whitespace" here, you
// need to change it too in RestyleManager::CharacterDataChanged.
if (!dom::IsSpaceCharacter(ch)) {
return false;
}
++cp;
}
return true;
}
already_AddRefed<nsAtom> CharacterData::GetCurrentValueAtom() {
nsAutoString val;
GetData(val);
return NS_Atomize(val);
}
void CharacterData::AddSizeOfExcludingThis(nsWindowSizes& aSizes,
size_t* aNodeSize) const {
nsIContent::AddSizeOfExcludingThis(aSizes, aNodeSize);
*aNodeSize += mText.SizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
}
} // namespace dom
} // namespace mozilla
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