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fune/dom/html/nsHTMLDocument.cpp
Emilio Cobos Álvarez 1c92ed74cb Bug 1839255 - Clean up a bit the mapped attribute set-up. r=smaug 
This doesn't change behavior on its own. It could be split up a bit more
if needed though over all it shouldn't be hard to follow.

Unify nsHTMLStyleSheet and nsHTMLCSSStyleSheet into AttributeStyles
because the fact that we have two right now is pretty silly. They are
also not stylesheets (they used to be pre-stylo).

Differential Revision: https://phabricator.services.mozilla.com/D181414
2023-06-20 10:02:44 +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/. */
#include "nsHTMLDocument.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/PresShell.h"
#include "mozilla/StaticPrefs_intl.h"
#include "nsCommandManager.h"
#include "nsCOMPtr.h"
#include "nsGlobalWindow.h"
#include "nsString.h"
#include "nsPrintfCString.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsGlobalWindowInner.h"
#include "nsIHTMLContentSink.h"
#include "nsIProtocolHandler.h"
#include "nsIXMLContentSink.h"
#include "nsHTMLParts.h"
#include "nsGkAtoms.h"
#include "nsPresContext.h"
#include "nsPIDOMWindow.h"
#include "nsDOMString.h"
#include "nsIStreamListener.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "nsIContentViewer.h"
#include "nsDocShell.h"
#include "nsDocShellLoadTypes.h"
#include "nsIScriptContext.h"
#include "nsContentList.h"
#include "nsError.h"
#include "nsIPrincipal.h"
#include "nsJSPrincipals.h"
#include "nsAttrName.h"
#include "nsNetCID.h"
#include "mozilla/parser/PrototypeDocumentParser.h"
#include "mozilla/dom/PrototypeDocumentContentSink.h"
#include "nsNameSpaceManager.h"
#include "nsGenericHTMLElement.h"
#include "mozilla/css/Loader.h"
#include "nsFrameSelection.h"
#include "nsContentUtils.h"
#include "nsJSUtils.h"
#include "DocumentInlines.h"
#include "nsICachingChannel.h"
#include "nsIScriptElement.h"
#include "nsArrayUtils.h"
// AHMED 12-2
#include "nsBidiUtils.h"
#include "mozilla/Encoding.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/IdentifierMapEntry.h"
#include "mozilla/LoadInfo.h"
#include "nsNodeInfoManager.h"
#include "nsRange.h"
#include "mozAutoDocUpdate.h"
#include "nsCCUncollectableMarker.h"
#include "nsHtml5Module.h"
#include "mozilla/dom/Element.h"
#include "mozilla/Preferences.h"
#include "nsMimeTypes.h"
#include "nsIRequest.h"
#include "nsHtml5TreeOpExecutor.h"
#include "nsHtml5Parser.h"
#include "nsParser.h"
#include "nsSandboxFlags.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "mozilla/dom/HTMLDocumentBinding.h"
#include "mozilla/dom/nsCSPContext.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/ShadowIncludingTreeIterator.h"
#include "nsCharsetSource.h"
#include "nsFocusManager.h"
#include "nsIFrame.h"
#include "nsIContent.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/Unused.h"
using namespace mozilla;
using namespace mozilla::dom;
#include "prtime.h"
// #define DEBUG_charset
// ==================================================================
// =
// ==================================================================
static bool IsAsciiCompatible(const Encoding* aEncoding) {
return aEncoding->IsAsciiCompatible() || aEncoding == ISO_2022_JP_ENCODING;
}
nsresult NS_NewHTMLDocument(Document** aInstancePtrResult, bool aLoadedAsData) {
RefPtr<nsHTMLDocument> doc = new nsHTMLDocument();
nsresult rv = doc->Init();
if (NS_FAILED(rv)) {
*aInstancePtrResult = nullptr;
return rv;
}
doc->SetLoadedAsData(aLoadedAsData, /* aConsiderForMemoryReporting */ true);
doc.forget(aInstancePtrResult);
return NS_OK;
}
nsHTMLDocument::nsHTMLDocument()
: Document("text/html"),
mContentListHolder(nullptr),
mNumForms(0),
mLoadFlags(0),
mWarnedWidthHeight(false),
mIsPlainText(false),
mViewSource(false) {
mType = eHTML;
mDefaultElementType = kNameSpaceID_XHTML;
mCompatMode = eCompatibility_NavQuirks;
}
nsHTMLDocument::~nsHTMLDocument() = default;
JSObject* nsHTMLDocument::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return HTMLDocument_Binding::Wrap(aCx, this, aGivenProto);
}
nsresult nsHTMLDocument::Init() {
nsresult rv = Document::Init();
NS_ENSURE_SUCCESS(rv, rv);
// Now reset the compatibility mode of the CSSLoader
// to match our compat mode.
CSSLoader()->SetCompatibilityMode(mCompatMode);
return NS_OK;
}
void nsHTMLDocument::Reset(nsIChannel* aChannel, nsILoadGroup* aLoadGroup) {
Document::Reset(aChannel, aLoadGroup);
if (aChannel) {
aChannel->GetLoadFlags(&mLoadFlags);
}
}
void nsHTMLDocument::ResetToURI(nsIURI* aURI, nsILoadGroup* aLoadGroup,
nsIPrincipal* aPrincipal,
nsIPrincipal* aPartitionedPrincipal) {
mLoadFlags = nsIRequest::LOAD_NORMAL;
Document::ResetToURI(aURI, aLoadGroup, aPrincipal, aPartitionedPrincipal);
mImages = nullptr;
mApplets = nullptr;
mEmbeds = nullptr;
mLinks = nullptr;
mAnchors = nullptr;
mScripts = nullptr;
mForms = nullptr;
// Make the content type default to "text/html", we are a HTML
// document, after all. Once we start getting data, this may be
// changed.
SetContentType(nsDependentCString("text/html"));
}
void nsHTMLDocument::TryReloadCharset(nsIContentViewer* aCv,
int32_t& aCharsetSource,
NotNull<const Encoding*>& aEncoding) {
if (aCv) {
int32_t reloadEncodingSource;
const auto reloadEncoding =
aCv->GetReloadEncodingAndSource(&reloadEncodingSource);
if (kCharsetUninitialized != reloadEncodingSource) {
aCv->ForgetReloadEncoding();
if (reloadEncodingSource <= aCharsetSource ||
!IsAsciiCompatible(aEncoding)) {
return;
}
if (reloadEncoding && IsAsciiCompatible(reloadEncoding)) {
aCharsetSource = reloadEncodingSource;
aEncoding = WrapNotNull(reloadEncoding);
}
}
}
}
void nsHTMLDocument::TryUserForcedCharset(nsIContentViewer* aCv,
nsIDocShell* aDocShell,
int32_t& aCharsetSource,
NotNull<const Encoding*>& aEncoding,
bool& aForceAutoDetection) {
auto resetForce = MakeScopeExit([&] {
if (aDocShell) {
nsDocShell::Cast(aDocShell)->ResetForcedAutodetection();
}
});
if (aCharsetSource >= kCharsetFromOtherComponent) {
return;
}
// mCharacterSet not updated yet for channel, so check aEncoding, too.
if (WillIgnoreCharsetOverride() || !IsAsciiCompatible(aEncoding)) {
return;
}
if (aDocShell && nsDocShell::Cast(aDocShell)->GetForcedAutodetection()) {
// This is the Character Encoding menu code path in Firefox
aForceAutoDetection = true;
}
}
void nsHTMLDocument::TryParentCharset(nsIDocShell* aDocShell,
int32_t& aCharsetSource,
NotNull<const Encoding*>& aEncoding,
bool& aForceAutoDetection) {
if (!aDocShell) {
return;
}
if (aCharsetSource >= kCharsetFromOtherComponent) {
return;
}
int32_t parentSource;
const Encoding* parentCharset;
nsCOMPtr<nsIPrincipal> parentPrincipal;
aDocShell->GetParentCharset(parentCharset, &parentSource,
getter_AddRefs(parentPrincipal));
if (!parentCharset) {
return;
}
if (kCharsetFromInitialUserForcedAutoDetection == parentSource ||
kCharsetFromFinalUserForcedAutoDetection == parentSource) {
if (WillIgnoreCharsetOverride() ||
!IsAsciiCompatible(aEncoding) || // if channel said UTF-16
!IsAsciiCompatible(parentCharset)) {
return;
}
aEncoding = WrapNotNull(parentCharset);
aCharsetSource = kCharsetFromParentFrame;
aForceAutoDetection = true;
return;
}
if (aCharsetSource >= kCharsetFromParentFrame) {
return;
}
if (kCharsetFromInitialAutoDetectionASCII <= parentSource) {
// Make sure that's OK
if (!NodePrincipal()->Equals(parentPrincipal) ||
!IsAsciiCompatible(parentCharset)) {
return;
}
aEncoding = WrapNotNull(parentCharset);
aCharsetSource = kCharsetFromParentFrame;
}
}
// Using a prototype document is only allowed with chrome privilege.
bool ShouldUsePrototypeDocument(nsIChannel* aChannel, Document* aDoc) {
if (!aChannel || !aDoc ||
!StaticPrefs::dom_prototype_document_cache_enabled()) {
return false;
}
return nsContentUtils::IsChromeDoc(aDoc);
}
nsresult nsHTMLDocument::StartDocumentLoad(
const char* aCommand, nsIChannel* aChannel, nsILoadGroup* aLoadGroup,
nsISupports* aContainer, nsIStreamListener** aDocListener, bool aReset) {
if (!aCommand) {
MOZ_ASSERT(false, "Command is mandatory");
return NS_ERROR_INVALID_POINTER;
}
if (mType != eHTML) {
MOZ_ASSERT(mType == eXHTML);
MOZ_ASSERT(false, "Must not set HTML doc to XHTML mode before load start.");
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
nsAutoCString contentType;
aChannel->GetContentType(contentType);
bool view =
!strcmp(aCommand, "view") || !strcmp(aCommand, "external-resource");
mViewSource = !strcmp(aCommand, "view-source");
bool asData = !strcmp(aCommand, kLoadAsData);
if (!(view || mViewSource || asData)) {
MOZ_ASSERT(false, "Bad parser command");
return NS_ERROR_INVALID_ARG;
}
bool html = contentType.EqualsLiteral(TEXT_HTML);
bool xhtml = !html && (contentType.EqualsLiteral(APPLICATION_XHTML_XML) ||
contentType.EqualsLiteral(APPLICATION_WAPXHTML_XML));
mIsPlainText =
!html && !xhtml && nsContentUtils::IsPlainTextType(contentType);
if (!(html || xhtml || mIsPlainText || mViewSource)) {
MOZ_ASSERT(false, "Channel with bad content type.");
return NS_ERROR_INVALID_ARG;
}
bool forceUtf8 =
mIsPlainText && nsContentUtils::IsUtf8OnlyPlainTextType(contentType);
bool loadAsHtml5 = true;
if (!mViewSource && xhtml) {
// We're parsing XHTML as XML, remember that.
mType = eXHTML;
SetCompatibilityMode(eCompatibility_FullStandards);
loadAsHtml5 = false;
}
// TODO: Proper about:blank treatment is bug 543435
if (loadAsHtml5 && view) {
// mDocumentURI hasn't been set, yet, so get the URI from the channel
nsCOMPtr<nsIURI> uri;
aChannel->GetOriginalURI(getter_AddRefs(uri));
// Adapted from nsDocShell:
// GetSpec can be expensive for some URIs, so check the scheme first.
if (uri && uri->SchemeIs("about")) {
if (uri->GetSpecOrDefault().EqualsLiteral("about:blank")) {
loadAsHtml5 = false;
}
}
}
nsresult rv = Document::StartDocumentLoad(aCommand, aChannel, aLoadGroup,
aContainer, aDocListener, aReset);
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<nsIURI> uri;
rv = aChannel->GetURI(getter_AddRefs(uri));
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aContainer));
bool loadWithPrototype = false;
RefPtr<nsHtml5Parser> html5Parser;
if (loadAsHtml5) {
html5Parser = nsHtml5Module::NewHtml5Parser();
mParser = html5Parser;
if (mIsPlainText) {
if (mViewSource) {
html5Parser->MarkAsNotScriptCreated("view-source-plain");
} else {
html5Parser->MarkAsNotScriptCreated("plain-text");
}
} else if (mViewSource && !html) {
html5Parser->MarkAsNotScriptCreated("view-source-xml");
} else {
html5Parser->MarkAsNotScriptCreated(aCommand);
}
} else if (xhtml && ShouldUsePrototypeDocument(aChannel, this)) {
loadWithPrototype = true;
nsCOMPtr<nsIURI> originalURI;
aChannel->GetOriginalURI(getter_AddRefs(originalURI));
mParser = new mozilla::parser::PrototypeDocumentParser(originalURI, this);
} else {
mParser = new nsParser();
}
// Look for the parent document. Note that at this point we don't have our
// content viewer set up yet, and therefore do not have a useful
// mParentDocument.
// in this block of code, if we get an error result, we return it
// but if we get a null pointer, that's perfectly legal for parent
// and parentContentViewer
nsCOMPtr<nsIDocShellTreeItem> parentAsItem;
if (docShell) {
docShell->GetInProcessSameTypeParent(getter_AddRefs(parentAsItem));
}
nsCOMPtr<nsIDocShell> parent(do_QueryInterface(parentAsItem));
nsCOMPtr<nsIContentViewer> parentContentViewer;
if (parent) {
rv = parent->GetContentViewer(getter_AddRefs(parentContentViewer));
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIContentViewer> cv;
if (docShell) {
docShell->GetContentViewer(getter_AddRefs(cv));
}
if (!cv) {
cv = std::move(parentContentViewer);
}
nsAutoCString urlSpec;
uri->GetSpec(urlSpec);
#ifdef DEBUG_charset
printf("Determining charset for %s\n", urlSpec.get());
#endif
// These are the charset source and charset for our document
bool forceAutoDetection = false;
int32_t charsetSource = kCharsetUninitialized;
auto encoding = UTF_8_ENCODING;
// For error reporting and referrer policy setting
nsHtml5TreeOpExecutor* executor = nullptr;
if (loadAsHtml5) {
executor = static_cast<nsHtml5TreeOpExecutor*>(mParser->GetContentSink());
}
if (forceUtf8) {
charsetSource = kCharsetFromUtf8OnlyMime;
} else if (!IsHTMLDocument() || !docShell) { // no docshell for text/html XHR
charsetSource =
IsHTMLDocument() ? kCharsetFromFallback : kCharsetFromDocTypeDefault;
TryChannelCharset(aChannel, charsetSource, encoding, executor);
} else {
NS_ASSERTION(docShell, "Unexpected null value");
// The following will try to get the character encoding from various
// sources. Each Try* function will return early if the source is already
// at least as large as any of the sources it might look at. Some of
// these functions (like TryReloadCharset and TryParentCharset) can set
// charsetSource to various values depending on where the charset they
// end up finding originally comes from.
// Try the channel's charset (e.g., charset from HTTP
// "Content-Type" header) first. This way, we get to reject overrides in
// TryParentCharset and TryUserForcedCharset if the channel said UTF-16.
// This is to avoid socially engineered XSS by adding user-supplied
// content to a UTF-16 site such that the byte have a dangerous
// interpretation as ASCII and the user can be lured to using the
// charset menu.
TryChannelCharset(aChannel, charsetSource, encoding, executor);
TryUserForcedCharset(cv, docShell, charsetSource, encoding,
forceAutoDetection);
TryReloadCharset(cv, charsetSource, encoding); // For encoding reload
TryParentCharset(docShell, charsetSource, encoding, forceAutoDetection);
}
SetDocumentCharacterSetSource(charsetSource);
SetDocumentCharacterSet(encoding);
// Set the parser as the stream listener for the document loader...
rv = NS_OK;
nsCOMPtr<nsIStreamListener> listener = mParser->GetStreamListener();
listener.forget(aDocListener);
#ifdef DEBUG_charset
printf(" charset = %s source %d\n", charset.get(), charsetSource);
#endif
mParser->SetDocumentCharset(encoding, charsetSource, forceAutoDetection);
mParser->SetCommand(aCommand);
if (!IsHTMLDocument()) {
MOZ_ASSERT(!loadAsHtml5);
if (loadWithPrototype) {
nsCOMPtr<nsIContentSink> sink;
NS_NewPrototypeDocumentContentSink(getter_AddRefs(sink), this, uri,
docShell, aChannel);
mParser->SetContentSink(sink);
} else {
nsCOMPtr<nsIXMLContentSink> xmlsink;
NS_NewXMLContentSink(getter_AddRefs(xmlsink), this, uri, docShell,
aChannel);
mParser->SetContentSink(xmlsink);
}
} else {
if (loadAsHtml5) {
html5Parser->Initialize(this, uri, docShell, aChannel);
} else {
// about:blank *only*
nsCOMPtr<nsIHTMLContentSink> htmlsink;
NS_NewHTMLContentSink(getter_AddRefs(htmlsink), this, uri, docShell,
aChannel);
mParser->SetContentSink(htmlsink);
}
}
// parser the content of the URI
mParser->Parse(uri);
return rv;
}
bool nsHTMLDocument::UseWidthDeviceWidthFallbackViewport() const {
if (mIsPlainText) {
// Plain text documents are simple enough that font inflation doesn't offer
// any appreciable advantage over defaulting to "width=device-width" and
// subsequently turning on word-wrapping.
return true;
}
return Document::UseWidthDeviceWidthFallbackViewport();
}
Element* nsHTMLDocument::GetUnfocusedKeyEventTarget() {
if (nsGenericHTMLElement* body = GetBody()) {
return body;
}
return Document::GetUnfocusedKeyEventTarget();
}
bool nsHTMLDocument::IsRegistrableDomainSuffixOfOrEqualTo(
const nsAString& aHostSuffixString, const nsACString& aOrigHost) {
// https://html.spec.whatwg.org/multipage/browsers.html#is-a-registrable-domain-suffix-of-or-is-equal-to
if (aHostSuffixString.IsEmpty()) {
return false;
}
nsCOMPtr<nsIURI> origURI = CreateInheritingURIForHost(aOrigHost);
if (!origURI) {
// Error: failed to parse input domain
return false;
}
nsCOMPtr<nsIURI> newURI =
RegistrableDomainSuffixOfInternal(aHostSuffixString, origURI);
if (!newURI) {
// Error: illegal domain
return false;
}
return true;
}
void nsHTMLDocument::AddedForm() { ++mNumForms; }
void nsHTMLDocument::RemovedForm() { --mNumForms; }
int32_t nsHTMLDocument::GetNumFormsSynchronous() const { return mNumForms; }
bool nsHTMLDocument::ResolveName(JSContext* aCx, const nsAString& aName,
JS::MutableHandle<JS::Value> aRetval,
ErrorResult& aError) {
IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aName);
if (!entry) {
return false;
}
nsBaseContentList* list = entry->GetNameContentList();
uint32_t length = list ? list->Length() : 0;
nsIContent* node;
if (length > 0) {
if (length > 1) {
// The list contains more than one element, return the whole list.
if (!ToJSValue(aCx, list, aRetval)) {
aError.NoteJSContextException(aCx);
return false;
}
return true;
}
// Only one element in the list, return the element instead of returning
// the list.
node = list->Item(0);
} else {
// No named items were found, see if there's one registerd by id for aName.
Element* e = entry->GetIdElement();
if (!e || !nsGenericHTMLElement::ShouldExposeIdAsHTMLDocumentProperty(e)) {
return false;
}
node = e;
}
if (!ToJSValue(aCx, node, aRetval)) {
aError.NoteJSContextException(aCx);
return false;
}
return true;
}
void nsHTMLDocument::GetSupportedNames(nsTArray<nsString>& aNames) {
for (const auto& entry : mIdentifierMap) {
if (entry.HasNameElement() ||
entry.HasIdElementExposedAsHTMLDocumentProperty()) {
aNames.AppendElement(entry.GetKeyAsString());
}
}
}
//----------------------------
// forms related stuff
bool nsHTMLDocument::MatchFormControls(Element* aElement, int32_t aNamespaceID,
nsAtom* aAtom, void* aData) {
return aElement->IsHTMLFormControlElement();
}
nsresult nsHTMLDocument::Clone(dom::NodeInfo* aNodeInfo,
nsINode** aResult) const {
NS_ASSERTION(aNodeInfo->NodeInfoManager() == mNodeInfoManager,
"Can't import this document into another document!");
RefPtr<nsHTMLDocument> clone = new nsHTMLDocument();
nsresult rv = CloneDocHelper(clone.get());
NS_ENSURE_SUCCESS(rv, rv);
// State from nsHTMLDocument
clone->mLoadFlags = mLoadFlags;
clone.forget(aResult);
return NS_OK;
}
/* virtual */
void nsHTMLDocument::DocAddSizeOfExcludingThis(
nsWindowSizes& aWindowSizes) const {
Document::DocAddSizeOfExcludingThis(aWindowSizes);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mLinks
// - mAnchors
}
bool nsHTMLDocument::WillIgnoreCharsetOverride() {
if (mEncodingMenuDisabled) {
return true;
}
if (mType != eHTML) {
MOZ_ASSERT(mType == eXHTML);
return true;
}
if (mCharacterSetSource >= kCharsetFromByteOrderMark) {
return true;
}
if (!mCharacterSet->IsAsciiCompatible() &&
mCharacterSet != ISO_2022_JP_ENCODING) {
return true;
}
nsIURI* uri = GetOriginalURI();
if (uri) {
if (uri->SchemeIs("about")) {
return true;
}
bool isResource;
nsresult rv = NS_URIChainHasFlags(
uri, nsIProtocolHandler::URI_IS_UI_RESOURCE, &isResource);
if (NS_FAILED(rv) || isResource) {
return true;
}
}
switch (mCharacterSetSource) {
case kCharsetUninitialized:
case kCharsetFromFallback:
case kCharsetFromDocTypeDefault:
case kCharsetFromInitialAutoDetectionWouldHaveBeenUTF8:
case kCharsetFromInitialAutoDetectionWouldNotHaveBeenUTF8DependedOnTLD:
case kCharsetFromFinalAutoDetectionWouldHaveBeenUTF8InitialWasASCII:
case kCharsetFromFinalAutoDetectionWouldNotHaveBeenUTF8DependedOnTLD:
case kCharsetFromParentFrame:
case kCharsetFromXmlDeclaration:
case kCharsetFromMetaTag:
case kCharsetFromChannel:
return false;
}
bool potentialEffect = false;
nsIPrincipal* parentPrincipal = NodePrincipal();
auto subDoc = [&potentialEffect, parentPrincipal](Document& aSubDoc) {
if (parentPrincipal->Equals(aSubDoc.NodePrincipal()) &&
!aSubDoc.WillIgnoreCharsetOverride()) {
potentialEffect = true;
return CallState::Stop;
}
return CallState::Continue;
};
EnumerateSubDocuments(subDoc);
return !potentialEffect;
}
void nsHTMLDocument::GetFormsAndFormControls(nsContentList** aFormList,
nsContentList** aFormControlList) {
RefPtr<ContentListHolder> holder = mContentListHolder;
if (!holder) {
// Flush our content model so it'll be up to date
// If this becomes unnecessary and the following line is removed,
// please also remove the corresponding flush operation from
// nsHtml5TreeBuilderCppSupplement.h. (Look for "See bug 497861." there.)
// XXXsmaug nsHtml5TreeBuilderCppSupplement doesn't seem to have such flush
// anymore.
FlushPendingNotifications(FlushType::Content);
RefPtr<nsContentList> htmlForms = GetExistingForms();
if (!htmlForms) {
// If the document doesn't have an existing forms content list, create a
// new one which will be released soon by ContentListHolder. The idea is
// that we don't have that list hanging around for a long time and slowing
// down future DOM mutations.
//
// Please keep this in sync with Document::Forms().
htmlForms = new nsContentList(this, kNameSpaceID_XHTML, nsGkAtoms::form,
nsGkAtoms::form,
/* aDeep = */ true,
/* aLiveList = */ true);
}
RefPtr<nsContentList> htmlFormControls = new nsContentList(
this, nsHTMLDocument::MatchFormControls, nullptr, nullptr,
/* aDeep = */ true,
/* aMatchAtom = */ nullptr,
/* aMatchNameSpaceId = */ kNameSpaceID_None,
/* aFuncMayDependOnAttr = */ true,
/* aLiveList = */ true);
holder = new ContentListHolder(this, htmlForms, htmlFormControls);
RefPtr<ContentListHolder> runnable = holder;
if (NS_SUCCEEDED(
Dispatch(TaskCategory::GarbageCollection, runnable.forget()))) {
mContentListHolder = holder;
}
}
NS_ADDREF(*aFormList = holder->mFormList);
NS_ADDREF(*aFormControlList = holder->mFormControlList);
}
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