gecko/parser/html/nsHtml5TreeOpExecutor.h

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/* 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/. */
#ifndef nsHtml5TreeOpExecutor_h__
#define nsHtml5TreeOpExecutor_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 "nsAHtml5TreeOpSink.h"
#include "nsHtml5TreeOpStage.h"
#include "nsIURI.h"
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "mozilla/LinkedList.h"
class nsHtml5Parser;
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,
public mozilla::LinkedListElement<nsHtml5TreeOpExecutor>
{
friend class nsHtml5FlushLoopGuard;
public:
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsHtml5TreeOpExecutor, nsContentSink)
private:
static bool sExternalViewSource;
#ifdef DEBUG_NS_HTML5_TREE_OP_EXECUTOR_FLUSH
static uint32_t sAppendBatchMaxSize;
static uint32_t sAppendBatchSlotsExamined;
static uint32_t sAppendBatchExaminations;
static uint32_t sLongestTimeOffTheEventLoop;
static uint32_t sTimesFlushLoopInterrupted;
#endif
/**
* Whether EOF needs to be suppressed
*/
bool mSuppressEOF;
bool mReadingFromStage;
nsTArray<nsHtml5TreeOperation> mOpQueue;
nsTArray<nsIContentPtr> mElementsSeenInThisAppendBatch;
nsTArray<nsHtml5PendingNotification> mPendingNotifications;
nsHtml5StreamParser* mStreamParser;
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nsTArray<nsCOMPtr<nsIContent> > mOwnedElements;
/**
* URLs already preloaded/preloading.
*/
nsTHashtable<nsCStringHashKey> mPreloadedURLs;
nsCOMPtr<nsIURI> mSpeculationBaseURI;
nsCOMPtr<nsIURI> mViewSourceBaseURI;
/**
* Whether the parser has started
*/
bool mStarted;
nsHtml5TreeOpStage mStage;
eHtml5FlushState mFlushState;
bool mRunFlushLoopOnStack;
bool mCallContinueInterruptedParsingIfEnabled;
/**
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* Non-NS_OK if this parser should refuse to process any more input.
* For example, the parser needs to be marked as broken if it drops some
* input due to a memory allocation failure. In such a case, the whole
* parser needs to be marked as broken, because some input has been lost
* and parsing more input could lead to a DOM where pieces of HTML source
* that weren't supposed to become scripts become scripts.
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*
* Since NS_OK is actually 0, zeroing operator new takes care of
* initializing this.
*/
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nsresult mBroken;
/**
* Whether this executor has already complained about matters related
* to character encoding declarations.
*/
bool mAlreadyComplainedAboutCharset;
public:
nsHtml5TreeOpExecutor(bool aRunsToCompletion = false);
virtual ~nsHtml5TreeOpExecutor();
// nsIContentSink
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillParse();
/**
*
*/
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NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode);
/**
* Emits EOF.
*/
NS_IMETHOD DidBuildModel(bool aTerminated);
/**
* Forwards to nsContentSink
*/
NS_IMETHOD WillInterrupt();
/**
* Unimplemented. For interface compat only.
*/
NS_IMETHOD WillResume();
/**
* Sets the parser.
*/
NS_IMETHOD SetParser(nsParserBase* 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 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;
}
bool IsScriptExecuting() {
return IsScriptExecutingImpl();
}
void SetNodeInfoManager(nsNodeInfoManager* aManager) {
mNodeInfoManager = aManager;
}
// Not from interface
void SetDocumentCharsetAndSource(nsACString& aCharset, int32_t aCharsetSource);
void SetStreamParser(nsHtml5StreamParser* aStreamParser) {
mStreamParser = aStreamParser;
}
void InitializeDocWriteParserState(nsAHtml5TreeBuilderState* aState, int32_t aLine);
bool IsScriptEnabled();
bool BelongsToStringParser() {
return mRunsToCompletion;
}
/**
* Marks this parser as broken and tells the stream parser (if any) to
* terminate.
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*
* @return aReason for convenience
*/
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nsresult MarkAsBroken(nsresult aReason);
/**
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* Checks if this parser is broken. Returns a non-NS_OK (i.e. non-0)
* value if broken.
*/
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inline nsresult IsBroken() {
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
return mBroken;
}
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) {
bool newParent = 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 = 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 bool 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 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,
int32_t aSource,
uint32_t aLineNumber);
void MaybeComplainAboutCharset(const char* aMsgId,
bool aError,
uint32_t aLineNumber);
void ComplainAboutBogusProtocolCharset(nsIDocument* aDoc);
bool IsComplete() {
return !mParser;
}
bool HasStarted() {
return mStarted;
}
bool IsFlushing() {
return mFlushState >= eInFlush;
}
#ifdef DEBUG
bool IsInFlushLoop() {
return mRunFlushLoopOnStack;
}
#endif
void RunScript(nsIContent* aScriptElement);
void Reset();
inline void HoldElement(nsIContent* aContent) {
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mOwnedElements.AppendElement(aContent);
}
void DropHeldElements();
/**
* 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 = true;
}
void StreamEnded();
#ifdef DEBUG
void AssertStageEmpty() {
mStage.AssertEmpty();
}
#endif
nsIURI* GetViewSourceBaseURI();
void PreloadScript(const nsAString& aURL,
const nsAString& aCharset,
const nsAString& aType,
const nsAString& aCrossOrigin,
bool aScriptFromHead);
void PreloadStyle(const nsAString& aURL, const nsAString& aCharset,
const nsAString& aCrossOrigin);
void PreloadImage(const nsAString& aURL, const nsAString& aCrossOrigin);
void SetSpeculationBase(const nsAString& aURL);
static void InitializeStatics();
private:
nsHtml5Parser* GetParser();
bool IsExternalViewSource();
/**
* Get a nsIURI for an nsString if the URL hasn't been preloaded yet.
*/
already_AddRefed<nsIURI> ConvertIfNotPreloadedYet(const nsAString& aURL);
};
#endif // nsHtml5TreeOpExecutor_h__