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fune/dom/base/nsContentSink.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/. */
/*
* Base class for the XML and HTML content sinks, which construct a
* DOM based on information from the parser.
*/
#include "nsContentSink.h"
#include "nsScriptLoader.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/SRILogHelper.h"
#include "nsStyleLinkElement.h"
#include "nsIDocShell.h"
#include "nsILoadContext.h"
#include "nsCPrefetchService.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "nsIMIMEHeaderParam.h"
#include "nsIProtocolHandler.h"
#include "nsIHttpChannel.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsViewManager.h"
#include "nsIAtom.h"
#include "nsGkAtoms.h"
#include "nsNetCID.h"
#include "nsIOfflineCacheUpdate.h"
#include "nsIApplicationCache.h"
#include "nsIApplicationCacheContainer.h"
#include "nsIApplicationCacheChannel.h"
#include "nsIScriptSecurityManager.h"
#include "nsICookieService.h"
#include "nsContentUtils.h"
#include "nsNodeInfoManager.h"
#include "nsIAppShell.h"
#include "nsIWidget.h"
#include "nsWidgetsCID.h"
#include "nsIDOMNode.h"
#include "mozAutoDocUpdate.h"
#include "nsIWebNavigation.h"
#include "nsGenericHTMLElement.h"
#include "nsHTMLDNSPrefetch.h"
#include "nsIObserverService.h"
#include "mozilla/Preferences.h"
#include "nsParserConstants.h"
#include "nsSandboxFlags.h"
using namespace mozilla;
LazyLogModule gContentSinkLogModuleInfo("nscontentsink");
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsContentSink)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsContentSink)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsContentSink)
NS_INTERFACE_MAP_ENTRY(nsICSSLoaderObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDocumentObserver)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_CLASS(nsContentSink)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsContentSink)
if (tmp->mDocument) {
tmp->mDocument->RemoveObserver(tmp);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParser)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCSSLoader)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mNodeInfoManager)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mScriptLoader)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsContentSink)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParser)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCSSLoader)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNodeInfoManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mScriptLoader)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
nsContentSink::nsContentSink()
{
// We have a zeroing operator new
NS_ASSERTION(!mLayoutStarted, "What?");
NS_ASSERTION(!mDynamicLowerValue, "What?");
NS_ASSERTION(!mParsing, "What?");
NS_ASSERTION(mLastSampledUserEventTime == 0, "What?");
NS_ASSERTION(mDeflectedCount == 0, "What?");
NS_ASSERTION(!mDroppedTimer, "What?");
NS_ASSERTION(mInMonolithicContainer == 0, "What?");
NS_ASSERTION(mInNotification == 0, "What?");
NS_ASSERTION(!mDeferredLayoutStart, "What?");
}
nsContentSink::~nsContentSink()
{
if (mDocument) {
// Remove ourselves just to be safe, though we really should have
// been removed in DidBuildModel if everything worked right.
mDocument->RemoveObserver(this);
}
}
bool nsContentSink::sNotifyOnTimer;
int32_t nsContentSink::sBackoffCount;
int32_t nsContentSink::sNotificationInterval;
int32_t nsContentSink::sInteractiveDeflectCount;
int32_t nsContentSink::sPerfDeflectCount;
int32_t nsContentSink::sPendingEventMode;
int32_t nsContentSink::sEventProbeRate;
int32_t nsContentSink::sInteractiveParseTime;
int32_t nsContentSink::sPerfParseTime;
int32_t nsContentSink::sInteractiveTime;
int32_t nsContentSink::sInitialPerfTime;
int32_t nsContentSink::sEnablePerfMode;
void
nsContentSink::InitializeStatics()
{
Preferences::AddBoolVarCache(&sNotifyOnTimer,
"content.notify.ontimer", true);
// -1 means never.
Preferences::AddIntVarCache(&sBackoffCount,
"content.notify.backoffcount", -1);
// The gNotificationInterval has a dramatic effect on how long it
// takes to initially display content for slow connections.
// The current value provides good
// incremental display of content without causing an increase
// in page load time. If this value is set below 1/10 of second
// it starts to impact page load performance.
// see bugzilla bug 72138 for more info.
Preferences::AddIntVarCache(&sNotificationInterval,
"content.notify.interval", 120000);
Preferences::AddIntVarCache(&sInteractiveDeflectCount,
"content.sink.interactive_deflect_count", 0);
Preferences::AddIntVarCache(&sPerfDeflectCount,
"content.sink.perf_deflect_count", 200);
Preferences::AddIntVarCache(&sPendingEventMode,
"content.sink.pending_event_mode", 1);
Preferences::AddIntVarCache(&sEventProbeRate,
"content.sink.event_probe_rate", 1);
Preferences::AddIntVarCache(&sInteractiveParseTime,
"content.sink.interactive_parse_time", 3000);
Preferences::AddIntVarCache(&sPerfParseTime,
"content.sink.perf_parse_time", 360000);
Preferences::AddIntVarCache(&sInteractiveTime,
"content.sink.interactive_time", 750000);
Preferences::AddIntVarCache(&sInitialPerfTime,
"content.sink.initial_perf_time", 2000000);
Preferences::AddIntVarCache(&sEnablePerfMode,
"content.sink.enable_perf_mode", 0);
}
nsresult
nsContentSink::Init(nsIDocument* aDoc,
nsIURI* aURI,
nsISupports* aContainer,
nsIChannel* aChannel)
{
NS_PRECONDITION(aDoc, "null ptr");
NS_PRECONDITION(aURI, "null ptr");
if (!aDoc || !aURI) {
return NS_ERROR_NULL_POINTER;
}
mDocument = aDoc;
mDocumentURI = aURI;
mDocShell = do_QueryInterface(aContainer);
mScriptLoader = mDocument->ScriptLoader();
if (!mRunsToCompletion) {
if (mDocShell) {
uint32_t loadType = 0;
mDocShell->GetLoadType(&loadType);
mDocument->SetChangeScrollPosWhenScrollingToRef(
(loadType & nsIDocShell::LOAD_CMD_HISTORY) == 0);
}
ProcessHTTPHeaders(aChannel);
}
mCSSLoader = aDoc->CSSLoader();
mNodeInfoManager = aDoc->NodeInfoManager();
mBackoffCount = sBackoffCount;
if (sEnablePerfMode != 0) {
mDynamicLowerValue = sEnablePerfMode == 1;
FavorPerformanceHint(!mDynamicLowerValue, 0);
}
return NS_OK;
}
NS_IMETHODIMP
nsContentSink::StyleSheetLoaded(StyleSheetHandle aSheet,
bool aWasAlternate,
nsresult aStatus)
{
NS_ASSERTION(!mRunsToCompletion, "How come a fragment parser observed sheets?");
if (!aWasAlternate) {
NS_ASSERTION(mPendingSheetCount > 0, "How'd that happen?");
--mPendingSheetCount;
if (mPendingSheetCount == 0 &&
(mDeferredLayoutStart || mDeferredFlushTags)) {
if (mDeferredFlushTags) {
FlushTags();
}
if (mDeferredLayoutStart) {
// We might not have really started layout, since this sheet was still
// loading. Do it now. Probably doesn't matter whether we do this
// before or after we unblock scripts, but before feels saner. Note
// that if mDeferredLayoutStart is true, that means any subclass
// StartLayout() stuff that needs to happen has already happened, so we
// don't need to worry about it.
StartLayout(false);
}
// Go ahead and try to scroll to our ref if we have one
ScrollToRef();
}
mScriptLoader->RemoveParserBlockingScriptExecutionBlocker();
}
return NS_OK;
}
nsresult
nsContentSink::ProcessHTTPHeaders(nsIChannel* aChannel)
{
nsCOMPtr<nsIHttpChannel> httpchannel(do_QueryInterface(aChannel));
if (!httpchannel) {
return NS_OK;
}
// Note that the only header we care about is the "link" header, since we
// have all the infrastructure for kicking off stylesheet loads.
nsAutoCString linkHeader;
nsresult rv = httpchannel->GetResponseHeader(NS_LITERAL_CSTRING("link"),
linkHeader);
if (NS_SUCCEEDED(rv) && !linkHeader.IsEmpty()) {
mDocument->SetHeaderData(nsGkAtoms::link,
NS_ConvertASCIItoUTF16(linkHeader));
NS_ASSERTION(!mProcessLinkHeaderEvent.get(),
"Already dispatched an event?");
mProcessLinkHeaderEvent =
NewNonOwningRunnableMethod(this,
&nsContentSink::DoProcessLinkHeader);
rv = NS_DispatchToCurrentThread(mProcessLinkHeaderEvent.get());
if (NS_FAILED(rv)) {
mProcessLinkHeaderEvent.Forget();
}
}
return NS_OK;
}
nsresult
nsContentSink::ProcessHeaderData(nsIAtom* aHeader, const nsAString& aValue,
nsIContent* aContent)
{
nsresult rv = NS_OK;
// necko doesn't process headers coming in from the parser
mDocument->SetHeaderData(aHeader, aValue);
if (aHeader == nsGkAtoms::setcookie) {
// Note: Necko already handles cookies set via the channel. We can't just
// call SetCookie on the channel because we want to do some security checks
// here.
nsCOMPtr<nsICookieService> cookieServ =
do_GetService(NS_COOKIESERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
return rv;
}
// Get a URI from the document principal
// We use the original codebase in case the codebase was changed
// by SetDomain
// Note that a non-codebase principal (eg the system principal) will return
// a null URI.
nsCOMPtr<nsIURI> codebaseURI;
rv = mDocument->NodePrincipal()->GetURI(getter_AddRefs(codebaseURI));
NS_ENSURE_TRUE(codebaseURI, rv);
nsCOMPtr<nsIChannel> channel;
if (mParser) {
mParser->GetChannel(getter_AddRefs(channel));
}
rv = cookieServ->SetCookieString(codebaseURI,
nullptr,
NS_ConvertUTF16toUTF8(aValue).get(),
channel);
if (NS_FAILED(rv)) {
return rv;
}
}
else if (aHeader == nsGkAtoms::msthemecompatible) {
// Disable theming for the presshell if the value is no.
// XXXbz don't we want to support this as an HTTP header too?
nsAutoString value(aValue);
if (value.LowerCaseEqualsLiteral("no")) {
nsIPresShell* shell = mDocument->GetShell();
if (shell) {
shell->DisableThemeSupport();
}
}
}
return rv;
}
void
nsContentSink::DoProcessLinkHeader()
{
nsAutoString value;
mDocument->GetHeaderData(nsGkAtoms::link, value);
ProcessLinkHeader(value);
}
// check whether the Link header field applies to the context resource
// see <http://tools.ietf.org/html/rfc5988#section-5.2>
bool
nsContentSink::LinkContextIsOurDocument(const nsSubstring& aAnchor)
{
if (aAnchor.IsEmpty()) {
// anchor parameter not present or empty -> same document reference
return true;
}
nsIURI* docUri = mDocument->GetDocumentURI();
// the document URI might contain a fragment identifier ("#...')
// we want to ignore that because it's invisible to the server
// and just affects the local interpretation in the recipient
nsCOMPtr<nsIURI> contextUri;
nsresult rv = docUri->CloneIgnoringRef(getter_AddRefs(contextUri));
if (NS_FAILED(rv)) {
// copying failed
return false;
}
// resolve anchor against context
nsCOMPtr<nsIURI> resolvedUri;
rv = NS_NewURI(getter_AddRefs(resolvedUri), aAnchor,
nullptr, contextUri);
if (NS_FAILED(rv)) {
// resolving failed
return false;
}
bool same;
rv = contextUri->Equals(resolvedUri, &same);
if (NS_FAILED(rv)) {
// comparison failed
return false;
}
return same;
}
// Decode a parameter value using the encoding defined in RFC 5987 (in place)
//
// charset "'" [ language ] "'" value-chars
//
// returns true when decoding happened successfully (otherwise leaves
// passed value alone)
bool
nsContentSink::Decode5987Format(nsAString& aEncoded) {
nsresult rv;
nsCOMPtr<nsIMIMEHeaderParam> mimehdrpar =
do_GetService(NS_MIMEHEADERPARAM_CONTRACTID, &rv);
if (NS_FAILED(rv))
return false;
nsAutoCString asciiValue;
const char16_t* encstart = aEncoded.BeginReading();
const char16_t* encend = aEncoded.EndReading();
// create a plain ASCII string, aborting if we can't do that
// converted form is always shorter than input
while (encstart != encend) {
if (*encstart > 0 && *encstart < 128) {
asciiValue.Append((char)*encstart);
} else {
return false;
}
encstart++;
}
nsAutoString decoded;
nsAutoCString language;
rv = mimehdrpar->DecodeRFC5987Param(asciiValue, language, decoded);
if (NS_FAILED(rv))
return false;
aEncoded = decoded;
return true;
}
nsresult
nsContentSink::ProcessLinkHeader(const nsAString& aLinkData)
{
nsresult rv = NS_OK;
// keep track where we are within the header field
bool seenParameters = false;
// parse link content and call process style link
nsAutoString href;
nsAutoString rel;
nsAutoString title;
nsAutoString titleStar;
nsAutoString type;
nsAutoString media;
nsAutoString anchor;
nsAutoString crossOrigin;
crossOrigin.SetIsVoid(true);
// copy to work buffer
nsAutoString stringList(aLinkData);
// put an extra null at the end
stringList.Append(kNullCh);
char16_t* start = stringList.BeginWriting();
char16_t* end = start;
char16_t* last = start;
char16_t endCh;
while (*start != kNullCh) {
// skip leading space
while ((*start != kNullCh) && nsCRT::IsAsciiSpace(*start)) {
++start;
}
end = start;
last = end - 1;
bool wasQuotedString = false;
// look for semicolon or comma
while (*end != kNullCh && *end != kSemicolon && *end != kComma) {
char16_t ch = *end;
if (ch == kQuote || ch == kLessThan) {
// quoted string
char16_t quote = ch;
if (quote == kLessThan) {
quote = kGreaterThan;
}
wasQuotedString = (ch == kQuote);
char16_t* closeQuote = (end + 1);
// seek closing quote
while (*closeQuote != kNullCh && quote != *closeQuote) {
// in quoted-string, "\" is an escape character
if (wasQuotedString && *closeQuote == kBackSlash && *(closeQuote + 1) != kNullCh) {
++closeQuote;
}
++closeQuote;
}
if (quote == *closeQuote) {
// found closer
// skip to close quote
end = closeQuote;
last = end - 1;
ch = *(end + 1);
if (ch != kNullCh && ch != kSemicolon && ch != kComma) {
// end string here
*(++end) = kNullCh;
ch = *(end + 1);
// keep going until semi or comma
while (ch != kNullCh && ch != kSemicolon && ch != kComma) {
++end;
ch = *end;
}
}
}
}
++end;
++last;
}
endCh = *end;
// end string here
*end = kNullCh;
if (start < end) {
if ((*start == kLessThan) && (*last == kGreaterThan)) {
*last = kNullCh;
// first instance of <...> wins
// also, do not allow hrefs after the first param was seen
if (href.IsEmpty() && !seenParameters) {
href = (start + 1);
href.StripWhitespace();
}
} else {
char16_t* equals = start;
seenParameters = true;
while ((*equals != kNullCh) && (*equals != kEqual)) {
equals++;
}
if (*equals != kNullCh) {
*equals = kNullCh;
nsAutoString attr(start);
attr.StripWhitespace();
char16_t* value = ++equals;
while (nsCRT::IsAsciiSpace(*value)) {
value++;
}
if ((*value == kQuote) && (*value == *last)) {
*last = kNullCh;
value++;
}
if (wasQuotedString) {
// unescape in-place
char16_t* unescaped = value;
char16_t *src = value;
while (*src != kNullCh) {
if (*src == kBackSlash && *(src + 1) != kNullCh) {
src++;
}
*unescaped++ = *src++;
}
*unescaped = kNullCh;
}
if (attr.LowerCaseEqualsLiteral("rel")) {
if (rel.IsEmpty()) {
rel = value;
rel.CompressWhitespace();
}
} else if (attr.LowerCaseEqualsLiteral("title")) {
if (title.IsEmpty()) {
title = value;
title.CompressWhitespace();
}
} else if (attr.LowerCaseEqualsLiteral("title*")) {
if (titleStar.IsEmpty() && !wasQuotedString) {
// RFC 5987 encoding; uses token format only, so skip if we get
// here with a quoted-string
nsAutoString tmp;
tmp = value;
if (Decode5987Format(tmp)) {
titleStar = tmp;
titleStar.CompressWhitespace();
} else {
// header value did not parse, throw it away
titleStar.Truncate();
}
}
} else if (attr.LowerCaseEqualsLiteral("type")) {
if (type.IsEmpty()) {
type = value;
type.StripWhitespace();
}
} else if (attr.LowerCaseEqualsLiteral("media")) {
if (media.IsEmpty()) {
media = value;
// The HTML5 spec is formulated in terms of the CSS3 spec,
// which specifies that media queries are case insensitive.
nsContentUtils::ASCIIToLower(media);
}
} else if (attr.LowerCaseEqualsLiteral("anchor")) {
if (anchor.IsEmpty()) {
anchor = value;
anchor.StripWhitespace();
}
} else if (attr.LowerCaseEqualsLiteral("crossorigin")) {
if (crossOrigin.IsVoid()) {
crossOrigin.SetIsVoid(false);
crossOrigin = value;
crossOrigin.StripWhitespace();
}
}
}
}
}
if (endCh == kComma) {
// hit a comma, process what we've got so far
href.Trim(" \t\n\r\f"); // trim HTML5 whitespace
if (!href.IsEmpty() && !rel.IsEmpty()) {
rv = ProcessLink(anchor, href, rel,
// prefer RFC 5987 variant over non-I18zed version
titleStar.IsEmpty() ? title : titleStar,
type, media, crossOrigin);
}
href.Truncate();
rel.Truncate();
title.Truncate();
type.Truncate();
media.Truncate();
anchor.Truncate();
crossOrigin.SetIsVoid(true);
seenParameters = false;
}
start = ++end;
}
href.Trim(" \t\n\r\f"); // trim HTML5 whitespace
if (!href.IsEmpty() && !rel.IsEmpty()) {
rv = ProcessLink(anchor, href, rel,
// prefer RFC 5987 variant over non-I18zed version
titleStar.IsEmpty() ? title : titleStar,
type, media, crossOrigin);
}
return rv;
}
nsresult
nsContentSink::ProcessLink(const nsSubstring& aAnchor, const nsSubstring& aHref,
const nsSubstring& aRel, const nsSubstring& aTitle,
const nsSubstring& aType, const nsSubstring& aMedia,
const nsSubstring& aCrossOrigin)
{
uint32_t linkTypes =
nsStyleLinkElement::ParseLinkTypes(aRel, mDocument->NodePrincipal());
// The link relation may apply to a different resource, specified
// in the anchor parameter. For the link relations supported so far,
// we simply abort if the link applies to a resource different to the
// one we've loaded
if (!LinkContextIsOurDocument(aAnchor)) {
return NS_OK;
}
if (!nsContentUtils::PrefetchEnabled(mDocShell)) {
return NS_OK;
}
bool hasPrefetch = linkTypes & nsStyleLinkElement::ePREFETCH;
// prefetch href if relation is "next" or "prefetch"
if (hasPrefetch || (linkTypes & nsStyleLinkElement::eNEXT)) {
PrefetchHref(aHref, mDocument, hasPrefetch);
}
if (!aHref.IsEmpty() && (linkTypes & nsStyleLinkElement::eDNS_PREFETCH)) {
PrefetchDNS(aHref);
}
if (!aHref.IsEmpty() && (linkTypes & nsStyleLinkElement::ePRECONNECT)) {
Preconnect(aHref, aCrossOrigin);
}
// is it a stylesheet link?
if (!(linkTypes & nsStyleLinkElement::eSTYLESHEET)) {
return NS_OK;
}
bool isAlternate = linkTypes & nsStyleLinkElement::eALTERNATE;
return ProcessStyleLink(nullptr, aHref, isAlternate, aTitle, aType,
aMedia);
}
nsresult
nsContentSink::ProcessStyleLink(nsIContent* aElement,
const nsSubstring& aHref,
bool aAlternate,
const nsSubstring& aTitle,
const nsSubstring& aType,
const nsSubstring& aMedia)
{
if (aAlternate && aTitle.IsEmpty()) {
// alternates must have title return without error, for now
return NS_OK;
}
nsAutoString mimeType;
nsAutoString params;
nsContentUtils::SplitMimeType(aType, mimeType, params);
// see bug 18817
if (!mimeType.IsEmpty() && !mimeType.LowerCaseEqualsLiteral("text/css")) {
// Unknown stylesheet language
return NS_OK;
}
nsCOMPtr<nsIURI> url;
nsresult rv = NS_NewURI(getter_AddRefs(url), aHref, nullptr,
mDocument->GetDocBaseURI());
if (NS_FAILED(rv)) {
// The URI is bad, move along, don't propagate the error (for now)
return NS_OK;
}
NS_ASSERTION(!aElement ||
aElement->NodeType() == nsIDOMNode::PROCESSING_INSTRUCTION_NODE,
"We only expect processing instructions here");
nsAutoString integrity;
if (aElement) {
aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::integrity, integrity);
}
if (!integrity.IsEmpty()) {
MOZ_LOG(dom::SRILogHelper::GetSriLog(), mozilla::LogLevel::Debug,
("nsContentSink::ProcessStyleLink, integrity=%s",
NS_ConvertUTF16toUTF8(integrity).get()));
}
// If this is a fragment parser, we don't want to observe.
// We don't support CORS for processing instructions
bool isAlternate;
rv = mCSSLoader->LoadStyleLink(aElement, url, aTitle, aMedia, aAlternate,
CORS_NONE, mDocument->GetReferrerPolicy(),
integrity, mRunsToCompletion ? nullptr : this,
&isAlternate);
NS_ENSURE_SUCCESS(rv, rv);
if (!isAlternate && !mRunsToCompletion) {
++mPendingSheetCount;
mScriptLoader->AddParserBlockingScriptExecutionBlocker();
}
return NS_OK;
}
nsresult
nsContentSink::ProcessMETATag(nsIContent* aContent)
{
NS_ASSERTION(aContent, "missing meta-element");
nsresult rv = NS_OK;
// set any HTTP-EQUIV data into document's header data as well as url
nsAutoString header;
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::httpEquiv, header);
if (!header.IsEmpty()) {
// Ignore META REFRESH when document is sandboxed from automatic features.
nsContentUtils::ASCIIToLower(header);
if (nsGkAtoms::refresh->Equals(header) &&
(mDocument->GetSandboxFlags() & SANDBOXED_AUTOMATIC_FEATURES)) {
return NS_OK;
}
nsAutoString result;
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::content, result);
if (!result.IsEmpty()) {
nsCOMPtr<nsIAtom> fieldAtom(NS_Atomize(header));
rv = ProcessHeaderData(fieldAtom, result, aContent);
}
}
NS_ENSURE_SUCCESS(rv, rv);
if (aContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
nsGkAtoms::handheldFriendly, eIgnoreCase)) {
nsAutoString result;
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::content, result);
if (!result.IsEmpty()) {
nsContentUtils::ASCIIToLower(result);
mDocument->SetHeaderData(nsGkAtoms::handheldFriendly, result);
}
}
return rv;
}
void
nsContentSink::PrefetchHref(const nsAString &aHref,
nsINode *aSource,
bool aExplicit)
{
nsCOMPtr<nsIPrefetchService> prefetchService(do_GetService(NS_PREFETCHSERVICE_CONTRACTID));
if (prefetchService) {
// construct URI using document charset
const nsACString &charset = mDocument->GetDocumentCharacterSet();
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aHref,
charset.IsEmpty() ? nullptr : PromiseFlatCString(charset).get(),
mDocument->GetDocBaseURI());
if (uri) {
nsCOMPtr<nsIDOMNode> domNode = do_QueryInterface(aSource);
prefetchService->PrefetchURI(uri, mDocumentURI, domNode, aExplicit);
}
}
}
void
nsContentSink::PrefetchDNS(const nsAString &aHref)
{
nsAutoString hostname;
if (StringBeginsWith(aHref, NS_LITERAL_STRING("//"))) {
hostname = Substring(aHref, 2);
}
else {
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aHref);
if (!uri) {
return;
}
nsresult rv;
bool isLocalResource = false;
rv = NS_URIChainHasFlags(uri, nsIProtocolHandler::URI_IS_LOCAL_RESOURCE,
&isLocalResource);
if (NS_SUCCEEDED(rv) && !isLocalResource) {
nsAutoCString host;
uri->GetHost(host);
CopyUTF8toUTF16(host, hostname);
}
}
if (!hostname.IsEmpty() && nsHTMLDNSPrefetch::IsAllowed(mDocument)) {
nsHTMLDNSPrefetch::PrefetchLow(hostname);
}
}
void
nsContentSink::Preconnect(const nsAString& aHref, const nsAString& aCrossOrigin)
{
// construct URI using document charset
const nsACString& charset = mDocument->GetDocumentCharacterSet();
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aHref,
charset.IsEmpty() ? nullptr : PromiseFlatCString(charset).get(),
mDocument->GetDocBaseURI());
if (uri && mDocument) {
mDocument->MaybePreconnect(uri, dom::Element::StringToCORSMode(aCrossOrigin));
}
}
nsresult
nsContentSink::SelectDocAppCache(nsIApplicationCache *aLoadApplicationCache,
nsIURI *aManifestURI,
bool aFetchedWithHTTPGetOrEquiv,
CacheSelectionAction *aAction)
{
nsresult rv;
*aAction = CACHE_SELECTION_NONE;
nsCOMPtr<nsIApplicationCacheContainer> applicationCacheDocument =
do_QueryInterface(mDocument);
NS_ASSERTION(applicationCacheDocument,
"mDocument must implement nsIApplicationCacheContainer.");
if (aLoadApplicationCache) {
nsCOMPtr<nsIURI> groupURI;
rv = aLoadApplicationCache->GetManifestURI(getter_AddRefs(groupURI));
NS_ENSURE_SUCCESS(rv, rv);
bool equal = false;
rv = groupURI->Equals(aManifestURI, &equal);
NS_ENSURE_SUCCESS(rv, rv);
if (!equal) {
// This is a foreign entry, force a reload to avoid loading the foreign
// entry. The entry will be marked as foreign to avoid loading it again.
*aAction = CACHE_SELECTION_RELOAD;
}
else {
// The http manifest attribute URI is equal to the manifest URI of
// the cache the document was loaded from - associate the document with
// that cache and invoke the cache update process.
#ifdef DEBUG
nsAutoCString docURISpec, clientID;
mDocumentURI->GetAsciiSpec(docURISpec);
aLoadApplicationCache->GetClientID(clientID);
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_CALLS,
("Selection: assigning app cache %s to document %s",
clientID.get(), docURISpec.get()));
#endif
rv = applicationCacheDocument->SetApplicationCache(aLoadApplicationCache);
NS_ENSURE_SUCCESS(rv, rv);
// Document will be added as implicit entry to the cache as part of
// the update process.
*aAction = CACHE_SELECTION_UPDATE;
}
}
else {
// The document was not loaded from an application cache
// Here we know the manifest has the same origin as the
// document. There is call to CheckMayLoad() on it above.
if (!aFetchedWithHTTPGetOrEquiv) {
// The document was not loaded using HTTP GET or equivalent
// method. The spec says to run the cache selection algorithm w/o
// the manifest specified.
*aAction = CACHE_SELECTION_RESELECT_WITHOUT_MANIFEST;
}
else {
// Always do an update in this case
*aAction = CACHE_SELECTION_UPDATE;
}
}
return NS_OK;
}
nsresult
nsContentSink::SelectDocAppCacheNoManifest(nsIApplicationCache *aLoadApplicationCache,
nsIURI **aManifestURI,
CacheSelectionAction *aAction)
{
*aManifestURI = nullptr;
*aAction = CACHE_SELECTION_NONE;
nsresult rv;
if (aLoadApplicationCache) {
// The document was loaded from an application cache, use that
// application cache as the document's application cache.
nsCOMPtr<nsIApplicationCacheContainer> applicationCacheDocument =
do_QueryInterface(mDocument);
NS_ASSERTION(applicationCacheDocument,
"mDocument must implement nsIApplicationCacheContainer.");
#ifdef DEBUG
nsAutoCString docURISpec, clientID;
mDocumentURI->GetAsciiSpec(docURISpec);
aLoadApplicationCache->GetClientID(clientID);
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_CALLS,
("Selection, no manifest: assigning app cache %s to document %s",
clientID.get(), docURISpec.get()));
#endif
rv = applicationCacheDocument->SetApplicationCache(aLoadApplicationCache);
NS_ENSURE_SUCCESS(rv, rv);
// Return the uri and invoke the update process for the selected
// application cache.
rv = aLoadApplicationCache->GetManifestURI(aManifestURI);
NS_ENSURE_SUCCESS(rv, rv);
*aAction = CACHE_SELECTION_UPDATE;
}
return NS_OK;
}
void
nsContentSink::ProcessOfflineManifest(nsIContent *aElement)
{
// Only check the manifest for root document nodes.
if (aElement != mDocument->GetRootElement()) {
return;
}
// Don't bother processing offline manifest for documents
// without a docshell
if (!mDocShell) {
return;
}
// Check for a manifest= attribute.
nsAutoString manifestSpec;
aElement->GetAttr(kNameSpaceID_None, nsGkAtoms::manifest, manifestSpec);
ProcessOfflineManifest(manifestSpec);
}
void
nsContentSink::ProcessOfflineManifest(const nsAString& aManifestSpec)
{
// Don't bother processing offline manifest for documents
// without a docshell
if (!mDocShell) {
return;
}
// If this document has been interecepted, let's skip the processing of the
// manifest.
if (nsContentUtils::IsControlledByServiceWorker(mDocument)) {
return;
}
// If the docshell's in private browsing mode, we don't want to do any
// manifest processing.
nsCOMPtr<nsILoadContext> loadContext = do_QueryInterface(mDocShell);
if (loadContext->UsePrivateBrowsing()) {
return;
}
nsresult rv;
// Grab the application cache the document was loaded from, if any.
nsCOMPtr<nsIApplicationCache> applicationCache;
nsCOMPtr<nsIApplicationCacheChannel> applicationCacheChannel =
do_QueryInterface(mDocument->GetChannel());
if (applicationCacheChannel) {
bool loadedFromApplicationCache;
rv = applicationCacheChannel->GetLoadedFromApplicationCache(
&loadedFromApplicationCache);
if (NS_FAILED(rv)) {
return;
}
if (loadedFromApplicationCache) {
rv = applicationCacheChannel->GetApplicationCache(
getter_AddRefs(applicationCache));
if (NS_FAILED(rv)) {
return;
}
}
}
if (aManifestSpec.IsEmpty() && !applicationCache) {
// Not loaded from an application cache, and no manifest
// attribute. Nothing to do here.
return;
}
CacheSelectionAction action = CACHE_SELECTION_NONE;
nsCOMPtr<nsIURI> manifestURI;
if (aManifestSpec.IsEmpty()) {
action = CACHE_SELECTION_RESELECT_WITHOUT_MANIFEST;
}
else {
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(manifestURI),
aManifestSpec, mDocument,
mDocumentURI);
if (!manifestURI) {
return;
}
// Documents must list a manifest from the same origin
rv = mDocument->NodePrincipal()->CheckMayLoad(manifestURI, true, false);
if (NS_FAILED(rv)) {
action = CACHE_SELECTION_RESELECT_WITHOUT_MANIFEST;
}
else {
// Only continue if the document has permission to use offline APIs or
// when preferences indicate to permit it automatically.
if (!nsContentUtils::OfflineAppAllowed(mDocument->NodePrincipal()) &&
!nsContentUtils::MaybeAllowOfflineAppByDefault(mDocument->NodePrincipal()) &&
!nsContentUtils::OfflineAppAllowed(mDocument->NodePrincipal())) {
return;
}
bool fetchedWithHTTPGetOrEquiv = false;
nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(mDocument->GetChannel()));
if (httpChannel) {
nsAutoCString method;
rv = httpChannel->GetRequestMethod(method);
if (NS_SUCCEEDED(rv))
fetchedWithHTTPGetOrEquiv = method.EqualsLiteral("GET");
}
rv = SelectDocAppCache(applicationCache, manifestURI,
fetchedWithHTTPGetOrEquiv, &action);
if (NS_FAILED(rv)) {
return;
}
}
}
if (action == CACHE_SELECTION_RESELECT_WITHOUT_MANIFEST) {
rv = SelectDocAppCacheNoManifest(applicationCache,
getter_AddRefs(manifestURI),
&action);
if (NS_FAILED(rv)) {
return;
}
}
switch (action)
{
case CACHE_SELECTION_NONE:
break;
case CACHE_SELECTION_UPDATE: {
nsCOMPtr<nsIOfflineCacheUpdateService> updateService =
do_GetService(NS_OFFLINECACHEUPDATESERVICE_CONTRACTID);
if (updateService) {
nsCOMPtr<nsIDOMDocument> domdoc = do_QueryInterface(mDocument);
updateService->ScheduleOnDocumentStop(manifestURI, mDocumentURI,
mDocument->NodePrincipal(), domdoc);
}
break;
}
case CACHE_SELECTION_RELOAD: {
// This situation occurs only for toplevel documents, see bottom
// of SelectDocAppCache method.
// The document has been loaded from a different offline cache group than
// the manifest it refers to, i.e. this is a foreign entry, mark it as such
// and force a reload to avoid loading it. The next attempt will not
// choose it.
applicationCacheChannel->MarkOfflineCacheEntryAsForeign();
nsCOMPtr<nsIWebNavigation> webNav = do_QueryInterface(mDocShell);
webNav->Stop(nsIWebNavigation::STOP_ALL);
webNav->Reload(nsIWebNavigation::LOAD_FLAGS_NONE);
break;
}
default:
NS_ASSERTION(false,
"Cache selection algorithm didn't decide on proper action");
break;
}
}
void
nsContentSink::ScrollToRef()
{
mDocument->ScrollToRef();
}
void
nsContentSink::StartLayout(bool aIgnorePendingSheets)
{
if (mLayoutStarted) {
// Nothing to do here
return;
}
mDeferredLayoutStart = true;
if (!aIgnorePendingSheets && WaitForPendingSheets()) {
// Bail out; we'll start layout when the sheets load
return;
}
mDeferredLayoutStart = false;
// Notify on all our content. If none of our presshells have started layout
// yet it'll be a no-op except for updating our data structures, a la
// UpdateChildCounts() (because we don't want to double-notify on whatever we
// have right now). If some of them _have_ started layout, we want to make
// sure to flush tags instead of just calling UpdateChildCounts() after we
// loop over the shells.
FlushTags();
mLayoutStarted = true;
mLastNotificationTime = PR_Now();
mDocument->SetMayStartLayout(true);
nsCOMPtr<nsIPresShell> shell = mDocument->GetShell();
// Make sure we don't call Initialize() for a shell that has
// already called it. This can happen when the layout frame for
// an iframe is constructed *between* the Embed() call for the
// docshell in the iframe, and the content sink's call to OpenBody().
// (Bug 153815)
if (shell && !shell->DidInitialize()) {
nsRect r = shell->GetPresContext()->GetVisibleArea();
nsCOMPtr<nsIPresShell> shellGrip = shell;
nsresult rv = shell->Initialize(r.width, r.height);
if (NS_FAILED(rv)) {
return;
}
}
// If the document we are loading has a reference or it is a
// frameset document, disable the scroll bars on the views.
mDocument->SetScrollToRef(mDocument->GetDocumentURI());
}
void
nsContentSink::NotifyAppend(nsIContent* aContainer, uint32_t aStartIndex)
{
if (aContainer->GetUncomposedDoc() != mDocument) {
// aContainer is not actually in our document anymore.... Just bail out of
// here; notifying on our document for this append would be wrong.
return;
}
mInNotification++;
{
// Scope so we call EndUpdate before we decrease mInNotification
MOZ_AUTO_DOC_UPDATE(mDocument, UPDATE_CONTENT_MODEL, !mBeganUpdate);
nsNodeUtils::ContentAppended(aContainer,
aContainer->GetChildAt(aStartIndex),
aStartIndex);
mLastNotificationTime = PR_Now();
}
mInNotification--;
}
NS_IMETHODIMP
nsContentSink::Notify(nsITimer *timer)
{
if (mParsing) {
// We shouldn't interfere with our normal DidProcessAToken logic
mDroppedTimer = true;
return NS_OK;
}
if (WaitForPendingSheets()) {
mDeferredFlushTags = true;
} else {
FlushTags();
// Now try and scroll to the reference
// XXX Should we scroll unconditionally for history loads??
ScrollToRef();
}
mNotificationTimer = nullptr;
return NS_OK;
}
bool
nsContentSink::IsTimeToNotify()
{
if (!sNotifyOnTimer || !mLayoutStarted || !mBackoffCount ||
mInMonolithicContainer) {
return false;
}
if (WaitForPendingSheets()) {
mDeferredFlushTags = true;
return false;
}
PRTime now = PR_Now();
int64_t interval = GetNotificationInterval();
int64_t diff = now - mLastNotificationTime;
if (diff > interval) {
mBackoffCount--;
return true;
}
return false;
}
nsresult
nsContentSink::WillInterruptImpl()
{
nsresult result = NS_OK;
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_CALLS,
("nsContentSink::WillInterrupt: this=%p", this));
#ifndef SINK_NO_INCREMENTAL
if (WaitForPendingSheets()) {
mDeferredFlushTags = true;
} else if (sNotifyOnTimer && mLayoutStarted) {
if (mBackoffCount && !mInMonolithicContainer) {
int64_t now = PR_Now();
int64_t interval = GetNotificationInterval();
int64_t diff = now - mLastNotificationTime;
// If it's already time for us to have a notification
if (diff > interval || mDroppedTimer) {
mBackoffCount--;
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_REFLOW,
("nsContentSink::WillInterrupt: flushing tags since we've "
"run out time; backoff count: %d", mBackoffCount));
result = FlushTags();
if (mDroppedTimer) {
ScrollToRef();
mDroppedTimer = false;
}
} else if (!mNotificationTimer) {
interval -= diff;
int32_t delay = interval;
// Convert to milliseconds
delay /= PR_USEC_PER_MSEC;
mNotificationTimer = do_CreateInstance("@mozilla.org/timer;1",
&result);
if (NS_SUCCEEDED(result)) {
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_REFLOW,
("nsContentSink::WillInterrupt: setting up timer with "
"delay %d", delay));
result =
mNotificationTimer->InitWithCallback(this, delay,
nsITimer::TYPE_ONE_SHOT);
if (NS_FAILED(result)) {
mNotificationTimer = nullptr;
}
}
}
}
} else {
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_REFLOW,
("nsContentSink::WillInterrupt: flushing tags "
"unconditionally"));
result = FlushTags();
}
#endif
mParsing = false;
return result;
}
nsresult
nsContentSink::WillResumeImpl()
{
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_CALLS,
("nsContentSink::WillResume: this=%p", this));
mParsing = true;
return NS_OK;
}
nsresult
nsContentSink::DidProcessATokenImpl()
{
if (mRunsToCompletion || !mParser) {
return NS_OK;
}
// Get the current user event time
nsIPresShell *shell = mDocument->GetShell();
if (!shell) {
// If there's no pres shell in the document, return early since
// we're not laying anything out here.
return NS_OK;
}
// Increase before comparing to gEventProbeRate
++mDeflectedCount;
// Check if there's a pending event
if (sPendingEventMode != 0 && !mHasPendingEvent &&
(mDeflectedCount % sEventProbeRate) == 0) {
nsViewManager* vm = shell->GetViewManager();
NS_ENSURE_TRUE(vm, NS_ERROR_FAILURE);
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
mHasPendingEvent = widget && widget->HasPendingInputEvent();
}
if (mHasPendingEvent && sPendingEventMode == 2) {
return NS_ERROR_HTMLPARSER_INTERRUPTED;
}
// Have we processed enough tokens to check time?
if (!mHasPendingEvent &&
mDeflectedCount < uint32_t(mDynamicLowerValue ? sInteractiveDeflectCount :
sPerfDeflectCount)) {
return NS_OK;
}
mDeflectedCount = 0;
// Check if it's time to return to the main event loop
if (PR_IntervalToMicroseconds(PR_IntervalNow()) > mCurrentParseEndTime) {
return NS_ERROR_HTMLPARSER_INTERRUPTED;
}
return NS_OK;
}
//----------------------------------------------------------------------
void
nsContentSink::FavorPerformanceHint(bool perfOverStarvation, uint32_t starvationDelay)
{
static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
nsCOMPtr<nsIAppShell> appShell = do_GetService(kAppShellCID);
if (appShell)
appShell->FavorPerformanceHint(perfOverStarvation, starvationDelay);
}
void
nsContentSink::BeginUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
// Remember nested updates from updates that we started.
if (mInNotification > 0 && mUpdatesInNotification < 2) {
++mUpdatesInNotification;
}
// If we're in a script and we didn't do the notification,
// something else in the script processing caused the
// notification to occur. Since this could result in frame
// creation, make sure we've flushed everything before we
// continue.
if (!mInNotification++) {
FlushTags();
}
}
void
nsContentSink::EndUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
// If we're in a script and we didn't do the notification,
// something else in the script processing caused the
// notification to occur. Update our notion of how much
// has been flushed to include any new content if ending
// this update leaves us not inside a notification.
if (!--mInNotification) {
UpdateChildCounts();
}
}
void
nsContentSink::DidBuildModelImpl(bool aTerminated)
{
if (mDocument) {
MOZ_ASSERT(aTerminated ||
mDocument->GetReadyStateEnum() ==
nsIDocument::READYSTATE_LOADING, "Bad readyState");
mDocument->SetReadyStateInternal(nsIDocument::READYSTATE_INTERACTIVE);
}
if (mScriptLoader) {
mScriptLoader->ParsingComplete(aTerminated);
}
if (!mDocument->HaveFiredDOMTitleChange()) {
mDocument->NotifyPossibleTitleChange(false);
}
// Cancel a timer if we had one out there
if (mNotificationTimer) {
SINK_TRACE(static_cast<LogModule*>(gContentSinkLogModuleInfo),
SINK_TRACE_REFLOW,
("nsContentSink::DidBuildModel: canceling notification "
"timeout"));
mNotificationTimer->Cancel();
mNotificationTimer = 0;
}
}
void
nsContentSink::DropParserAndPerfHint(void)
{
if (!mParser) {
// Make sure we don't unblock unload too many times
return;
}
// Ref. Bug 49115
// Do this hack to make sure that the parser
// doesn't get destroyed, accidently, before
// the circularity, between sink & parser, is
// actually broken.
// Drop our reference to the parser to get rid of a circular
// reference.
RefPtr<nsParserBase> kungFuDeathGrip(mParser.forget());
if (mDynamicLowerValue) {
// Reset the performance hint which was set to FALSE
// when mDynamicLowerValue was set.
FavorPerformanceHint(true, 0);
}
if (!mRunsToCompletion) {
mDocument->UnblockOnload(true);
}
}
bool
nsContentSink::IsScriptExecutingImpl()
{
return !!mScriptLoader->GetCurrentScript();
}
nsresult
nsContentSink::WillParseImpl(void)
{
if (mRunsToCompletion || !mDocument) {
return NS_OK;
}
nsIPresShell *shell = mDocument->GetShell();
if (!shell) {
return NS_OK;
}
uint32_t currentTime = PR_IntervalToMicroseconds(PR_IntervalNow());
if (sEnablePerfMode == 0) {
nsViewManager* vm = shell->GetViewManager();
NS_ENSURE_TRUE(vm, NS_ERROR_FAILURE);
uint32_t lastEventTime;
vm->GetLastUserEventTime(lastEventTime);
bool newDynLower =
mDocument->IsInBackgroundWindow() ||
((currentTime - mBeginLoadTime) > uint32_t(sInitialPerfTime) &&
(currentTime - lastEventTime) < uint32_t(sInteractiveTime));
if (mDynamicLowerValue != newDynLower) {
FavorPerformanceHint(!newDynLower, 0);
mDynamicLowerValue = newDynLower;
}
}
mDeflectedCount = 0;
mHasPendingEvent = false;
mCurrentParseEndTime = currentTime +
(mDynamicLowerValue ? sInteractiveParseTime : sPerfParseTime);
return NS_OK;
}
void
nsContentSink::WillBuildModelImpl()
{
if (!mRunsToCompletion) {
mDocument->BlockOnload();
mBeginLoadTime = PR_IntervalToMicroseconds(PR_IntervalNow());
}
mDocument->ResetScrolledToRefAlready();
if (mProcessLinkHeaderEvent.get()) {
mProcessLinkHeaderEvent.Revoke();
DoProcessLinkHeader();
}
}
/* static */
void
nsContentSink::NotifyDocElementCreated(nsIDocument* aDoc)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(aDoc);
observerService->
NotifyObservers(domDoc, "document-element-inserted",
EmptyString().get());
}
nsContentUtils::DispatchChromeEvent(aDoc, aDoc,
NS_LITERAL_STRING("DOMDocElementInserted"),
true, false);
}
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