gecko-dev/parser/html/nsHtml5TreeOpExecutor.h

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is HTML Parser Gecko integration code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Henri Sivonen <hsivonen@iki.fi>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsHtml5TreeOpExecutor_h__
#define nsHtml5TreeOpExecutor_h__
#include "prtypes.h"
#include "nsIAtom.h"
#include "nsINameSpaceManager.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsTraceRefcnt.h"
#include "nsHtml5TreeOperation.h"
#include "nsHtml5SpeculativeLoad.h"
#include "nsHtml5PendingNotification.h"
#include "nsTArray.h"
#include "nsContentSink.h"
#include "nsNodeInfoManager.h"
#include "nsHtml5DocumentMode.h"
#include "nsIScriptElement.h"
#include "nsIParser.h"
#include "nsCOMArray.h"
#include "nsAHtml5TreeOpSink.h"
#include "nsHtml5TreeOpStage.h"
#include "nsHashSets.h"
#include "nsIURI.h"
class nsHtml5TreeBuilder;
class nsHtml5Tokenizer;
class nsHtml5StreamParser;
typedef nsIContent* nsIContentPtr;
enum eHtml5FlushState {
eNotFlushing = 0, // not flushing
eInFlush = 1, // the Flush() method is on the call stack
eInDocUpdate = 2, // inside an update batch on the document
eNotifying = 3 // flushing pending append notifications
};
class nsHtml5TreeOpExecutor : public nsContentSink,
public nsIContentSink,
public nsAHtml5TreeOpSink
{
friend class nsHtml5FlushLoopGuard;
public:
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsHtml5TreeOpExecutor, nsContentSink)
private:
#ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
static PRUint32 sAppendBatchMaxSize;
static PRUint32 sAppendBatchSlotsExamined;
static PRUint32 sAppendBatchExaminations;
static PRUint32 sLongestTimeOffTheEventLoop;
static PRUint32 sTimesFlushLoopInterrupted;
#endif
/**
* Whether EOF needs to be suppressed
*/
PRBool mSuppressEOF;
PRBool mReadingFromStage;
nsTArray<nsHtml5TreeOperation> mOpQueue;
nsTArray<nsIContentPtr> mElementsSeenInThisAppendBatch;
nsTArray<nsHtml5PendingNotification> mPendingNotifications;
nsHtml5StreamParser* mStreamParser;
nsCOMArray<nsIContent> mOwnedElements;
/**
* URLs already preloaded/preloading.
*/
nsCStringHashSet mPreloadedURLs;
nsCOMPtr<nsIURI> mSpeculationBaseURI;
/**
* Whether the parser has started
*/
PRBool mStarted;
nsHtml5TreeOpStage mStage;
eHtml5FlushState mFlushState;
PRBool mRunFlushLoopOnStack;
PRBool mCallContinueInterruptedParsingIfEnabled;
PRBool mFragmentMode;
public:
nsHtml5TreeOpExecutor();
virtual ~nsHtml5TreeOpExecutor();
// nsIContentSink
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillParse();
/**
*
*/
NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode) {
NS_ASSERTION(GetDocument()->GetScriptGlobalObject(),
"Script global object not ready");
mDocument->AddObserver(this);
WillBuildModelImpl();
GetDocument()->BeginLoad();
return NS_OK;
}
/**
* Emits EOF.
*/
NS_IMETHOD DidBuildModel(PRBool aTerminated);
/**
* Forwards to nsContentSink
*/
NS_IMETHOD WillInterrupt();
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillResume();
/**
* Sets the parser.
*/
NS_IMETHOD SetParser(nsIParser* aParser);
/**
* No-op for backwards compat.
*/
virtual void FlushPendingNotifications(mozFlushType aType);
/**
* Don't call. For interface compat only.
*/
NS_IMETHOD SetDocumentCharset(nsACString& aCharset) {
NS_NOTREACHED("No one should call this.");
return NS_ERROR_NOT_IMPLEMENTED;
}
/**
* Returns the document.
*/
virtual nsISupports *GetTarget();
// nsContentSink methods
virtual void UpdateChildCounts();
virtual nsresult FlushTags();
virtual void PostEvaluateScript(nsIScriptElement *aElement);
virtual void ContinueInterruptedParsingAsync();
/**
* Sets up style sheet load / parse
*/
void UpdateStyleSheet(nsIContent* aElement);
// Getters and setters for fields from nsContentSink
nsIDocument* GetDocument() {
return mDocument;
}
nsNodeInfoManager* GetNodeInfoManager() {
return mNodeInfoManager;
}
nsIDocShell* GetDocShell() {
return mDocShell;
}
PRBool IsScriptExecuting() {
return IsScriptExecutingImpl();
}
void SetNodeInfoManager(nsNodeInfoManager* aManager) {
mNodeInfoManager = aManager;
}
// Not from interface
void SetDocumentCharsetAndSource(nsACString& aCharset, PRInt32 aCharsetSource);
void SetStreamParser(nsHtml5StreamParser* aStreamParser) {
mStreamParser = aStreamParser;
}
void InitializeDocWriteParserState(nsAHtml5TreeBuilderState* aState, PRInt32 aLine);
PRBool IsScriptEnabled();
void EnableFragmentMode() {
mFragmentMode = PR_TRUE;
mCanInterruptParser = PR_FALSE; // prevent DropParserAndPerfHint
// from unblocking onload
}
PRBool IsFragmentMode() {
return mFragmentMode;
}
inline void BeginDocUpdate() {
NS_PRECONDITION(mFlushState == eInFlush, "Tried to double-open update.");
NS_PRECONDITION(mParser, "Started update without parser.");
mFlushState = eInDocUpdate;
mDocument->BeginUpdate(UPDATE_CONTENT_MODEL);
}
inline void EndDocUpdate() {
NS_PRECONDITION(mFlushState != eNotifying, "mFlushState out of sync");
if (mFlushState == eInDocUpdate) {
FlushPendingAppendNotifications();
mFlushState = eInFlush;
mDocument->EndUpdate(UPDATE_CONTENT_MODEL);
}
}
void PostPendingAppendNotification(nsIContent* aParent, nsIContent* aChild) {
PRBool newParent = PR_TRUE;
const nsIContentPtr* first = mElementsSeenInThisAppendBatch.Elements();
const nsIContentPtr* last = first + mElementsSeenInThisAppendBatch.Length() - 1;
for (const nsIContentPtr* iter = last; iter >= first; --iter) {
#ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
sAppendBatchSlotsExamined++;
#endif
if (*iter == aParent) {
newParent = PR_FALSE;
break;
}
}
if (aChild->IsElement()) {
mElementsSeenInThisAppendBatch.AppendElement(aChild);
}
mElementsSeenInThisAppendBatch.AppendElement(aParent);
if (newParent) {
mPendingNotifications.AppendElement(aParent);
}
#ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
sAppendBatchExaminations++;
#endif
}
void FlushPendingAppendNotifications() {
NS_PRECONDITION(mFlushState == eInDocUpdate, "Notifications flushed outside update");
mFlushState = eNotifying;
const nsHtml5PendingNotification* start = mPendingNotifications.Elements();
const nsHtml5PendingNotification* end = start + mPendingNotifications.Length();
for (nsHtml5PendingNotification* iter = (nsHtml5PendingNotification*)start; iter < end; ++iter) {
iter->Fire();
}
mPendingNotifications.Clear();
#ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
if (mElementsSeenInThisAppendBatch.Length() > sAppendBatchMaxSize) {
sAppendBatchMaxSize = mElementsSeenInThisAppendBatch.Length();
}
#endif
mElementsSeenInThisAppendBatch.Clear();
NS_ASSERTION(mFlushState == eNotifying, "mFlushState out of sync");
mFlushState = eInDocUpdate;
}
inline PRBool HaveNotified(nsIContent* aNode) {
NS_PRECONDITION(aNode, "HaveNotified called with null argument.");
const nsHtml5PendingNotification* start = mPendingNotifications.Elements();
const nsHtml5PendingNotification* end = start + mPendingNotifications.Length();
for (;;) {
nsIContent* parent = aNode->GetParent();
if (!parent) {
return PR_TRUE;
}
for (nsHtml5PendingNotification* iter = (nsHtml5PendingNotification*)start; iter < end; ++iter) {
if (iter->Contains(parent)) {
return iter->HaveNotifiedIndex(parent->IndexOf(aNode));
}
}
aNode = parent;
}
}
void StartLayout();
void SetDocumentMode(nsHtml5DocumentMode m);
nsresult Init(nsIDocument* aDoc, nsIURI* aURI,
nsISupports* aContainer, nsIChannel* aChannel);
void FlushSpeculativeLoads();
void RunFlushLoop();
void FlushDocumentWrite();
void MaybeSuspend();
void Start();
void NeedsCharsetSwitchTo(const char* aEncoding);
PRBool IsComplete() {
return !mParser;
}
PRBool HasStarted() {
return mStarted;
}
PRBool IsFlushing() {
return mFlushState >= eInFlush;
}
#ifdef DEBUG
PRBool IsInFlushLoop() {
return mRunFlushLoopOnStack;
}
#endif
void RunScript(nsIContent* aScriptElement);
void Reset();
inline void HoldElement(nsIContent* aContent) {
mOwnedElements.AppendObject(aContent);
}
void DropHeldElements() {
mOwnedElements.Clear();
}
/**
* Flush the operations from the tree operations from the argument
* queue unconditionally. (This is for the main thread case.)
*/
virtual void MoveOpsFrom(nsTArray<nsHtml5TreeOperation>& aOpQueue);
nsHtml5TreeOpStage* GetStage() {
return &mStage;
}
void StartReadingFromStage() {
mReadingFromStage = PR_TRUE;
}
void StreamEnded();
#ifdef DEBUG
void AssertStageEmpty() {
mStage.AssertEmpty();
}
#endif
void PreloadScript(const nsAString& aURL,
const nsAString& aCharset,
const nsAString& aType);
void PreloadStyle(const nsAString& aURL, const nsAString& aCharset);
void PreloadImage(const nsAString& aURL);
void SetSpeculationBase(const nsAString& aURL);
private:
nsHtml5Tokenizer* GetTokenizer();
/**
* Get a nsIURI for an nsString if the URL hasn't been preloaded yet.
*/
already_AddRefed<nsIURI> ConvertIfNotPreloadedYet(const nsAString& aURL);
};
#endif // nsHtml5TreeOpExecutor_h__