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gecko-dev/dom/html/nsHTMLContentSink.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/. */
/**
* This file is near-OBSOLETE. It is used for about:blank only and for the
* HTML element factory.
* Don't bother adding new stuff in this file.
*/
#include "mozilla/ArrayUtils.h"
#include "nsContentSink.h"
#include "nsCOMPtr.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsIHTMLContentSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIURI.h"
#include "nsIContentViewer.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/ScriptLoader.h"
#include "nsIAppShell.h"
#include "nsCRT.h"
#include "prtime.h"
#include "mozilla/Logging.h"
#include "nsNodeUtils.h"
#include "nsIContent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/Preferences.h"
#include "nsGenericHTMLElement.h"
#include "nsIDOMDocument.h"
#include "nsIDOMDocumentType.h"
#include "nsIScriptElement.h"
#include "nsIComponentManager.h"
#include "nsIServiceManager.h"
#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "nsIChannel.h"
#include "nsIHttpChannel.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsStubDocumentObserver.h"
#include "nsIHTMLDocument.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsICookieService.h"
#include "nsTArray.h"
#include "nsIScriptSecurityManager.h"
#include "nsIPrincipal.h"
#include "nsTextFragment.h"
#include "nsIScriptGlobalObject.h"
#include "nsNameSpaceManager.h"
#include "nsIParserService.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsITimer.h"
#include "nsError.h"
#include "nsContentPolicyUtils.h"
#include "nsIScriptContext.h"
#include "nsStyleLinkElement.h"
#include "nsWeakReference.h" // nsHTMLElementFactory supports weak references
#include "nsIPrompt.h"
#include "nsLayoutCID.h"
#include "nsIDocShellTreeItem.h"
#include "nsEscape.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "mozAutoDocUpdate.h"
#include "nsTextNode.h"
using namespace mozilla;
using namespace mozilla::dom;
//----------------------------------------------------------------------
typedef nsGenericHTMLElement*
(*contentCreatorCallback)(already_AddRefed<mozilla::dom::NodeInfo>&&,
FromParser aFromParser);
nsGenericHTMLElement*
NS_NewHTMLNOTUSEDElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
FromParser aFromParser)
{
NS_NOTREACHED("The element ctor should never be called");
return nullptr;
}
#define HTML_TAG(_tag, _classname, _interfacename) NS_NewHTML##_classname##Element,
#define HTML_OTHER(_tag) NS_NewHTMLNOTUSEDElement,
static const contentCreatorCallback sContentCreatorCallbacks[] = {
NS_NewHTMLUnknownElement,
#include "nsHTMLTagList.h"
#undef HTML_TAG
#undef HTML_OTHER
NS_NewHTMLUnknownElement
};
class SinkContext;
class HTMLContentSink;
/**
* This class is near-OBSOLETE. It is used for about:blank only.
* Don't bother adding new stuff in this file.
*/
class HTMLContentSink : public nsContentSink,
public nsIHTMLContentSink
{
public:
friend class SinkContext;
HTMLContentSink();
nsresult Init(nsIDocument* aDoc, nsIURI* aURI, nsISupports* aContainer,
nsIChannel* aChannel);
// nsISupports
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLContentSink, nsContentSink)
// nsIContentSink
NS_IMETHOD WillParse(void) override;
NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode) override;
NS_IMETHOD DidBuildModel(bool aTerminated) override;
NS_IMETHOD WillInterrupt(void) override;
NS_IMETHOD WillResume(void) override;
NS_IMETHOD SetParser(nsParserBase* aParser) override;
virtual void FlushPendingNotifications(FlushType aType) override;
virtual void SetDocumentCharset(NotNull<const Encoding*> aEncoding) override;
virtual nsISupports *GetTarget() override;
virtual bool IsScriptExecuting() override;
// nsIHTMLContentSink
NS_IMETHOD OpenContainer(ElementType aNodeType) override;
NS_IMETHOD CloseContainer(ElementType aTag) override;
protected:
virtual ~HTMLContentSink();
nsCOMPtr<nsIHTMLDocument> mHTMLDocument;
// The maximum length of a text run
int32_t mMaxTextRun;
RefPtr<nsGenericHTMLElement> mRoot;
RefPtr<nsGenericHTMLElement> mBody;
RefPtr<nsGenericHTMLElement> mHead;
AutoTArray<SinkContext*, 8> mContextStack;
SinkContext* mCurrentContext;
SinkContext* mHeadContext;
// Boolean indicating whether we've seen a <head> tag that might have had
// attributes once already.
bool mHaveSeenHead;
// Boolean indicating whether we've notified insertion of our root content
// yet. We want to make sure to only do this once.
bool mNotifiedRootInsertion;
nsresult FlushTags() override;
// Routines for tags that require special handling
nsresult CloseHTML();
nsresult OpenBody();
nsresult CloseBody();
void CloseHeadContext();
// nsContentSink overrides
void UpdateChildCounts() override;
void NotifyInsert(nsIContent* aContent,
nsIContent* aChildContent,
int32_t aIndexInContainer);
void NotifyRootInsertion();
};
class SinkContext
{
public:
explicit SinkContext(HTMLContentSink* aSink);
~SinkContext();
nsresult Begin(nsHTMLTag aNodeType, nsGenericHTMLElement* aRoot,
uint32_t aNumFlushed, int32_t aInsertionPoint);
nsresult OpenBody();
nsresult CloseBody();
nsresult End();
nsresult GrowStack();
nsresult FlushTags();
bool IsCurrentContainer(nsHTMLTag mType);
void DidAddContent(nsIContent* aContent);
void UpdateChildCounts();
private:
// Function to check whether we've notified for the current content.
// What this actually does is check whether we've notified for all
// of the parent's kids.
bool HaveNotifiedForCurrentContent() const;
public:
HTMLContentSink* mSink;
int32_t mNotifyLevel;
struct Node {
nsHTMLTag mType;
nsGenericHTMLElement* mContent;
uint32_t mNumFlushed;
int32_t mInsertionPoint;
nsIContent *Add(nsIContent *child);
};
Node* mStack;
int32_t mStackSize;
int32_t mStackPos;
};
nsresult
NS_NewHTMLElement(Element** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
FromParser aFromParser, const nsAString* aIs)
{
*aResult = nullptr;
RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo;
nsIParserService* parserService = nsContentUtils::GetParserService();
if (!parserService)
return NS_ERROR_OUT_OF_MEMORY;
nsIAtom *name = nodeInfo->NameAtom();
NS_ASSERTION(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML),
"Trying to HTML elements that don't have the XHTML namespace");
int32_t tag = parserService->HTMLCaseSensitiveAtomTagToId(name);
// Per the Custom Element specification, unknown tags that are valid custom
// element names should be HTMLElement instead of HTMLUnknownElement.
bool isCustomElementName = (tag == eHTMLTag_userdefined &&
nsContentUtils::IsCustomElementName(name));
if (isCustomElementName) {
NS_IF_ADDREF(*aResult = NS_NewHTMLElement(nodeInfo.forget(), aFromParser));
} else {
*aResult = CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take();
}
if (!*aResult) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (CustomElementRegistry::IsCustomElementEnabled() &&
(isCustomElementName || aIs)) {
nsContentUtils::SetupCustomElement(*aResult, aIs);
}
return NS_OK;
}
already_AddRefed<nsGenericHTMLElement>
CreateHTMLElement(uint32_t aNodeType,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
FromParser aFromParser)
{
NS_ASSERTION(aNodeType <= NS_HTML_TAG_MAX ||
aNodeType == eHTMLTag_userdefined,
"aNodeType is out of bounds");
contentCreatorCallback cb = sContentCreatorCallbacks[aNodeType];
NS_ASSERTION(cb != NS_NewHTMLNOTUSEDElement,
"Don't know how to construct tag element!");
RefPtr<nsGenericHTMLElement> result = cb(Move(aNodeInfo), aFromParser);
return result.forget();
}
//----------------------------------------------------------------------
SinkContext::SinkContext(HTMLContentSink* aSink)
: mSink(aSink),
mNotifyLevel(0),
mStack(nullptr),
mStackSize(0),
mStackPos(0)
{
MOZ_COUNT_CTOR(SinkContext);
}
SinkContext::~SinkContext()
{
MOZ_COUNT_DTOR(SinkContext);
if (mStack) {
for (int32_t i = 0; i < mStackPos; i++) {
NS_RELEASE(mStack[i].mContent);
}
delete [] mStack;
}
}
nsresult
SinkContext::Begin(nsHTMLTag aNodeType,
nsGenericHTMLElement* aRoot,
uint32_t aNumFlushed,
int32_t aInsertionPoint)
{
if (mStackSize < 1) {
nsresult rv = GrowStack();
if (NS_FAILED(rv)) {
return rv;
}
}
mStack[0].mType = aNodeType;
mStack[0].mContent = aRoot;
mStack[0].mNumFlushed = aNumFlushed;
mStack[0].mInsertionPoint = aInsertionPoint;
NS_ADDREF(aRoot);
mStackPos = 1;
return NS_OK;
}
bool
SinkContext::IsCurrentContainer(nsHTMLTag aTag)
{
if (aTag == mStack[mStackPos - 1].mType) {
return true;
}
return false;
}
void
SinkContext::DidAddContent(nsIContent* aContent)
{
if ((mStackPos == 2) && (mSink->mBody == mStack[1].mContent)) {
// We just finished adding something to the body
mNotifyLevel = 0;
}
// If we just added content to a node for which
// an insertion happen, we need to do an immediate
// notification for that insertion.
if (0 < mStackPos &&
mStack[mStackPos - 1].mInsertionPoint != -1 &&
mStack[mStackPos - 1].mNumFlushed <
mStack[mStackPos - 1].mContent->GetChildCount()) {
nsIContent* parent = mStack[mStackPos - 1].mContent;
int32_t childIndex = mStack[mStackPos - 1].mInsertionPoint - 1;
NS_ASSERTION(parent->GetChildAt(childIndex) == aContent,
"Flushing the wrong child.");
mSink->NotifyInsert(parent, aContent, childIndex);
mStack[mStackPos - 1].mNumFlushed = parent->GetChildCount();
} else if (mSink->IsTimeToNotify()) {
FlushTags();
}
}
nsresult
SinkContext::OpenBody()
{
if (mStackPos <= 0) {
NS_ERROR("container w/o parent");
return NS_ERROR_FAILURE;
}
nsresult rv;
if (mStackPos + 1 > mStackSize) {
rv = GrowStack();
if (NS_FAILED(rv)) {
return rv;
}
}
RefPtr<mozilla::dom::NodeInfo> nodeInfo =
mSink->mNodeInfoManager->GetNodeInfo(nsGkAtoms::body, nullptr,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
NS_ENSURE_TRUE(nodeInfo, NS_ERROR_UNEXPECTED);
// Make the content object
RefPtr<nsGenericHTMLElement> body =
NS_NewHTMLBodyElement(nodeInfo.forget(), FROM_PARSER_NETWORK);
if (!body) {
return NS_ERROR_OUT_OF_MEMORY;
}
mStack[mStackPos].mType = eHTMLTag_body;
body.forget(&mStack[mStackPos].mContent);
mStack[mStackPos].mNumFlushed = 0;
mStack[mStackPos].mInsertionPoint = -1;
++mStackPos;
mStack[mStackPos - 2].Add(mStack[mStackPos - 1].mContent);
return NS_OK;
}
bool
SinkContext::HaveNotifiedForCurrentContent() const
{
if (0 < mStackPos) {
nsIContent* parent = mStack[mStackPos - 1].mContent;
return mStack[mStackPos-1].mNumFlushed == parent->GetChildCount();
}
return true;
}
nsIContent *
SinkContext::Node::Add(nsIContent *child)
{
NS_ASSERTION(mContent, "No parent to insert/append into!");
if (mInsertionPoint != -1) {
NS_ASSERTION(mNumFlushed == mContent->GetChildCount(),
"Inserting multiple children without flushing.");
mContent->InsertChildAt(child, mInsertionPoint++, false);
} else {
mContent->AppendChildTo(child, false);
}
return child;
}
nsresult
SinkContext::CloseBody()
{
NS_ASSERTION(mStackPos > 0,
"stack out of bounds. wrong context probably!");
if (mStackPos <= 0) {
return NS_OK; // Fix crash - Ref. bug 45975 or 45007
}
--mStackPos;
NS_ASSERTION(mStack[mStackPos].mType == eHTMLTag_body,
"Tag mismatch. Closing tag on wrong context or something?");
nsGenericHTMLElement* content = mStack[mStackPos].mContent;
content->Compact();
// If we're in a state where we do append notifications as
// we go up the tree, and we're at the level where the next
// notification needs to be done, do the notification.
if (mNotifyLevel >= mStackPos) {
// Check to see if new content has been added after our last
// notification
if (mStack[mStackPos].mNumFlushed < content->GetChildCount()) {
mSink->NotifyAppend(content, mStack[mStackPos].mNumFlushed);
mStack[mStackPos].mNumFlushed = content->GetChildCount();
}
// Indicate that notification has now happened at this level
mNotifyLevel = mStackPos - 1;
}
DidAddContent(content);
NS_IF_RELEASE(content);
return NS_OK;
}
nsresult
SinkContext::End()
{
for (int32_t i = 0; i < mStackPos; i++) {
NS_RELEASE(mStack[i].mContent);
}
mStackPos = 0;
return NS_OK;
}
nsresult
SinkContext::GrowStack()
{
int32_t newSize = mStackSize * 2;
if (newSize == 0) {
newSize = 32;
}
Node* stack = new Node[newSize];
if (mStackPos != 0) {
memcpy(stack, mStack, sizeof(Node) * mStackPos);
delete [] mStack;
}
mStack = stack;
mStackSize = newSize;
return NS_OK;
}
/**
* NOTE!! Forked into nsXMLContentSink. Please keep in sync.
*
* Flush all elements that have been seen so far such that
* they are visible in the tree. Specifically, make sure
* that they are all added to their respective parents.
* Also, do notification at the top for all content that
* has been newly added so that the frame tree is complete.
*/
nsresult
SinkContext::FlushTags()
{
mSink->mDeferredFlushTags = false;
bool oldBeganUpdate = mSink->mBeganUpdate;
uint32_t oldUpdates = mSink->mUpdatesInNotification;
++(mSink->mInNotification);
mSink->mUpdatesInNotification = 0;
{
// Scope so we call EndUpdate before we decrease mInNotification
mozAutoDocUpdate updateBatch(mSink->mDocument, UPDATE_CONTENT_MODEL,
true);
mSink->mBeganUpdate = true;
// Start from the base of the stack (growing downward) and do
// a notification from the node that is closest to the root of
// tree for any content that has been added.
// Note that we can start at stackPos == 0 here, because it's the caller's
// responsibility to handle flushing interactions between contexts (see
// HTMLContentSink::BeginContext).
int32_t stackPos = 0;
bool flushed = false;
uint32_t childCount;
nsGenericHTMLElement* content;
while (stackPos < mStackPos) {
content = mStack[stackPos].mContent;
childCount = content->GetChildCount();
if (!flushed && (mStack[stackPos].mNumFlushed < childCount)) {
if (mStack[stackPos].mInsertionPoint != -1) {
// We might have popped the child off our stack already
// but not notified on it yet, which is why we have to get it
// directly from its parent node.
int32_t childIndex = mStack[stackPos].mInsertionPoint - 1;
nsIContent* child = content->GetChildAt(childIndex);
// Child not on stack anymore; can't assert it's correct
NS_ASSERTION(!(mStackPos > (stackPos + 1)) ||
(child == mStack[stackPos + 1].mContent),
"Flushing the wrong child.");
mSink->NotifyInsert(content, child, childIndex);
} else {
mSink->NotifyAppend(content, mStack[stackPos].mNumFlushed);
}
flushed = true;
}
mStack[stackPos].mNumFlushed = childCount;
stackPos++;
}
mNotifyLevel = mStackPos - 1;
}
--(mSink->mInNotification);
if (mSink->mUpdatesInNotification > 1) {
UpdateChildCounts();
}
mSink->mUpdatesInNotification = oldUpdates;
mSink->mBeganUpdate = oldBeganUpdate;
return NS_OK;
}
/**
* NOTE!! Forked into nsXMLContentSink. Please keep in sync.
*/
void
SinkContext::UpdateChildCounts()
{
// Start from the top of the stack (growing upwards) and see if any
// new content has been appended. If so, we recognize that reflows
// have been generated for it and we should make sure that no
// further reflows occur. Note that we have to include stackPos == 0
// to properly notify on kids of <html>.
int32_t stackPos = mStackPos - 1;
while (stackPos >= 0) {
Node & node = mStack[stackPos];
node.mNumFlushed = node.mContent->GetChildCount();
stackPos--;
}
mNotifyLevel = mStackPos - 1;
}
nsresult
NS_NewHTMLContentSink(nsIHTMLContentSink** aResult,
nsIDocument* aDoc,
nsIURI* aURI,
nsISupports* aContainer,
nsIChannel* aChannel)
{
NS_ENSURE_ARG_POINTER(aResult);
RefPtr<HTMLContentSink> it = new HTMLContentSink();
nsresult rv = it->Init(aDoc, aURI, aContainer, aChannel);
NS_ENSURE_SUCCESS(rv, rv);
*aResult = it;
NS_ADDREF(*aResult);
return NS_OK;
}
HTMLContentSink::HTMLContentSink()
: mMaxTextRun(0)
, mCurrentContext(nullptr)
, mHeadContext(nullptr)
, mHaveSeenHead(false)
, mNotifiedRootInsertion(false)
{
}
HTMLContentSink::~HTMLContentSink()
{
if (mNotificationTimer) {
mNotificationTimer->Cancel();
}
int32_t numContexts = mContextStack.Length();
if (mCurrentContext == mHeadContext && numContexts > 0) {
// Pop off the second html context if it's not done earlier
mContextStack.RemoveElementAt(--numContexts);
}
int32_t i;
for (i = 0; i < numContexts; i++) {
SinkContext* sc = mContextStack.ElementAt(i);
if (sc) {
sc->End();
if (sc == mCurrentContext) {
mCurrentContext = nullptr;
}
delete sc;
}
}
if (mCurrentContext == mHeadContext) {
mCurrentContext = nullptr;
}
delete mCurrentContext;
delete mHeadContext;
}
NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLContentSink)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLContentSink, nsContentSink)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mHTMLDocument)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mBody)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mHead)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLContentSink,
nsContentSink)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHTMLDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBody)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHead)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLContentSink)
NS_INTERFACE_TABLE_BEGIN
NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIContentSink)
NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIHTMLContentSink)
NS_INTERFACE_TABLE_END
NS_INTERFACE_TABLE_TAIL_INHERITING(nsContentSink)
NS_IMPL_ADDREF_INHERITED(HTMLContentSink, nsContentSink)
NS_IMPL_RELEASE_INHERITED(HTMLContentSink, nsContentSink)
nsresult
HTMLContentSink::Init(nsIDocument* aDoc,
nsIURI* aURI,
nsISupports* aContainer,
nsIChannel* aChannel)
{
NS_ENSURE_TRUE(aContainer, NS_ERROR_NULL_POINTER);
nsresult rv = nsContentSink::Init(aDoc, aURI, aContainer, aChannel);
if (NS_FAILED(rv)) {
return rv;
}
aDoc->AddObserver(this);
mIsDocumentObserver = true;
mHTMLDocument = do_QueryInterface(aDoc);
NS_ASSERTION(mDocShell, "oops no docshell!");
// Changed from 8192 to greatly improve page loading performance on
// large pages. See bugzilla bug 77540.
mMaxTextRun = Preferences::GetInt("content.maxtextrun", 8191);
RefPtr<mozilla::dom::NodeInfo> nodeInfo;
nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::html, nullptr,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
// Make root part
mRoot = NS_NewHTMLHtmlElement(nodeInfo.forget());
if (!mRoot) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ASSERTION(mDocument->GetChildCount() == 0,
"Document should have no kids here!");
rv = mDocument->AppendChildTo(mRoot, false);
NS_ENSURE_SUCCESS(rv, rv);
// Make head part
nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::head,
nullptr, kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
mHead = NS_NewHTMLHeadElement(nodeInfo.forget());
if (NS_FAILED(rv)) {
return NS_ERROR_OUT_OF_MEMORY;
}
mRoot->AppendChildTo(mHead, false);
mCurrentContext = new SinkContext(this);
mCurrentContext->Begin(eHTMLTag_html, mRoot, 0, -1);
mContextStack.AppendElement(mCurrentContext);
return NS_OK;
}
NS_IMETHODIMP
HTMLContentSink::WillParse(void)
{
return WillParseImpl();
}
NS_IMETHODIMP
HTMLContentSink::WillBuildModel(nsDTDMode aDTDMode)
{
WillBuildModelImpl();
if (mHTMLDocument) {
nsCompatibility mode = eCompatibility_NavQuirks;
switch (aDTDMode) {
case eDTDMode_full_standards:
mode = eCompatibility_FullStandards;
break;
case eDTDMode_almost_standards:
mode = eCompatibility_AlmostStandards;
break;
default:
break;
}
mHTMLDocument->SetCompatibilityMode(mode);
}
// Notify document that the load is beginning
mDocument->BeginLoad();
return NS_OK;
}
NS_IMETHODIMP
HTMLContentSink::DidBuildModel(bool aTerminated)
{
DidBuildModelImpl(aTerminated);
// Reflow the last batch of content
if (mBody) {
mCurrentContext->FlushTags();
} else if (!mLayoutStarted) {
// We never saw the body, and layout never got started. Force
// layout *now*, to get an initial reflow.
// NOTE: only force the layout if we are NOT destroying the
// docshell. If we are destroying it, then starting layout will
// likely cause us to crash, or at best waste a lot of time as we
// are just going to tear it down anyway.
bool bDestroying = true;
if (mDocShell) {
mDocShell->IsBeingDestroyed(&bDestroying);
}
if (!bDestroying) {
StartLayout(false);
}
}
ScrollToRef();
// Make sure we no longer respond to document mutations. We've flushed all
// our notifications out, so there's no need to do anything else here.
// XXXbz I wonder whether we could End() our contexts here too, or something,
// just to make sure we no longer notify... Or is the mIsDocumentObserver
// thing sufficient?
mDocument->RemoveObserver(this);
mIsDocumentObserver = false;
mDocument->EndLoad();
DropParserAndPerfHint();
return NS_OK;
}
NS_IMETHODIMP
HTMLContentSink::SetParser(nsParserBase* aParser)
{
NS_PRECONDITION(aParser, "Should have a parser here!");
mParser = aParser;
return NS_OK;
}
nsresult
HTMLContentSink::CloseHTML()
{
if (mHeadContext) {
if (mCurrentContext == mHeadContext) {
uint32_t numContexts = mContextStack.Length();
// Pop off the second html context if it's not done earlier
mCurrentContext = mContextStack.ElementAt(--numContexts);
mContextStack.RemoveElementAt(numContexts);
}
mHeadContext->End();
delete mHeadContext;
mHeadContext = nullptr;
}
return NS_OK;
}
nsresult
HTMLContentSink::OpenBody()
{
CloseHeadContext(); // do this just in case if the HEAD was left open!
// if we already have a body we're done
if (mBody) {
return NS_OK;
}
nsresult rv = mCurrentContext->OpenBody();
if (NS_FAILED(rv)) {
return rv;
}
mBody = mCurrentContext->mStack[mCurrentContext->mStackPos - 1].mContent;
if (mCurrentContext->mStackPos > 1) {
int32_t parentIndex = mCurrentContext->mStackPos - 2;
nsGenericHTMLElement *parent = mCurrentContext->mStack[parentIndex].mContent;
int32_t numFlushed = mCurrentContext->mStack[parentIndex].mNumFlushed;
int32_t childCount = parent->GetChildCount();
NS_ASSERTION(numFlushed < childCount, "Already notified on the body?");
int32_t insertionPoint =
mCurrentContext->mStack[parentIndex].mInsertionPoint;
// XXX: I have yet to see a case where numFlushed is non-zero and
// insertionPoint is not -1, but this code will try to handle
// those cases too.
uint32_t oldUpdates = mUpdatesInNotification;
mUpdatesInNotification = 0;
if (insertionPoint != -1) {
NotifyInsert(parent, mBody, insertionPoint - 1);
} else {
NotifyAppend(parent, numFlushed);
}
mCurrentContext->mStack[parentIndex].mNumFlushed = childCount;
if (mUpdatesInNotification > 1) {
UpdateChildCounts();
}
mUpdatesInNotification = oldUpdates;
}
StartLayout(false);
return NS_OK;
}
nsresult
HTMLContentSink::CloseBody()
{
// Flush out anything that's left
mCurrentContext->FlushTags();
mCurrentContext->CloseBody();
return NS_OK;
}
NS_IMETHODIMP
HTMLContentSink::OpenContainer(ElementType aElementType)
{
nsresult rv = NS_OK;
switch (aElementType) {
case eBody:
rv = OpenBody();
break;
case eHTML:
if (mRoot) {
// If we've already hit this code once, then we're done
if (!mNotifiedRootInsertion) {
NotifyRootInsertion();
}
ProcessOfflineManifest(mRoot);
}
break;
}
return rv;
}
NS_IMETHODIMP
HTMLContentSink::CloseContainer(const ElementType aTag)
{
nsresult rv = NS_OK;
switch (aTag) {
case eBody:
rv = CloseBody();
break;
case eHTML:
rv = CloseHTML();
break;
}
return rv;
}
NS_IMETHODIMP
HTMLContentSink::WillInterrupt()
{
return WillInterruptImpl();
}
NS_IMETHODIMP
HTMLContentSink::WillResume()
{
return WillResumeImpl();
}
void
HTMLContentSink::CloseHeadContext()
{
if (mCurrentContext) {
if (!mCurrentContext->IsCurrentContainer(eHTMLTag_head))
return;
mCurrentContext->FlushTags();
}
if (!mContextStack.IsEmpty())
{
uint32_t n = mContextStack.Length() - 1;
mCurrentContext = mContextStack.ElementAt(n);
mContextStack.RemoveElementAt(n);
}
}
void
HTMLContentSink::NotifyInsert(nsIContent* aContent,
nsIContent* aChildContent,
int32_t aIndexInContainer)
{
if (aContent && aContent->GetUncomposedDoc() != mDocument) {
// aContent is not actually in our document anymore.... Just bail out of
// here; notifying on our document for this insert would be wrong.
return;
}
mInNotification++;
{
// Scope so we call EndUpdate before we decrease mInNotification
MOZ_AUTO_DOC_UPDATE(mDocument, UPDATE_CONTENT_MODEL, !mBeganUpdate);
nsNodeUtils::ContentInserted(NODE_FROM(aContent, mDocument),
aChildContent, aIndexInContainer);
mLastNotificationTime = PR_Now();
}
mInNotification--;
}
void
HTMLContentSink::NotifyRootInsertion()
{
NS_PRECONDITION(!mNotifiedRootInsertion, "Double-notifying on root?");
NS_ASSERTION(!mLayoutStarted,
"How did we start layout without notifying on root?");
// Now make sure to notify that we have now inserted our root. If
// there has been no initial reflow yet it'll be a no-op, but if
// there has been one we need this to get its frames constructed.
// Note that if mNotifiedRootInsertion is true we don't notify here,
// since that just means there are multiple <html> tags in the
// document; in those cases we just want to put all the attrs on one
// tag.
mNotifiedRootInsertion = true;
int32_t index = mDocument->IndexOf(mRoot);
NS_ASSERTION(index != -1, "mRoot not child of document?");
NotifyInsert(nullptr, mRoot, index);
// Now update the notification information in all our
// contexts, since we just inserted the root and notified on
// our whole tree
UpdateChildCounts();
}
void
HTMLContentSink::UpdateChildCounts()
{
uint32_t numContexts = mContextStack.Length();
for (uint32_t i = 0; i < numContexts; i++) {
SinkContext* sc = mContextStack.ElementAt(i);
sc->UpdateChildCounts();
}
mCurrentContext->UpdateChildCounts();
}
void
HTMLContentSink::FlushPendingNotifications(FlushType aType)
{
// Only flush tags if we're not doing the notification ourselves
// (since we aren't reentrant)
if (!mInNotification) {
// Only flush if we're still a document observer (so that our child counts
// should be correct).
if (mIsDocumentObserver) {
if (aType >= FlushType::ContentAndNotify) {
FlushTags();
}
}
if (aType >= FlushType::EnsurePresShellInitAndFrames) {
// Make sure that layout has started so that the reflow flush
// will actually happen.
StartLayout(true);
}
}
}
nsresult
HTMLContentSink::FlushTags()
{
if (!mNotifiedRootInsertion) {
NotifyRootInsertion();
return NS_OK;
}
return mCurrentContext ? mCurrentContext->FlushTags() : NS_OK;
}
void
HTMLContentSink::SetDocumentCharset(NotNull<const Encoding*> aEncoding)
{
MOZ_ASSERT_UNREACHABLE("<meta charset> case doesn't occur with about:blank");
}
nsISupports *
HTMLContentSink::GetTarget()
{
return mDocument;
}
bool
HTMLContentSink::IsScriptExecuting()
{
return IsScriptExecutingImpl();
}
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