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/*
* Copyright (C) 2010 Google, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HTMLDocumentParser_h
#define HTMLDocumentParser_h
#include "core/dom/ParserContentPolicy.h"
#include "core/dom/ScriptableDocumentParser.h"
#include "core/fetch/ResourceClient.h"
#include "core/html/parser/BackgroundHTMLInputStream.h"
#include "core/html/parser/CompactHTMLToken.h"
#include "core/html/parser/HTMLInputStream.h"
#include "core/html/parser/HTMLParserOptions.h"
#include "core/html/parser/HTMLPreloadScanner.h"
#include "core/html/parser/HTMLScriptRunnerHost.h"
#include "core/html/parser/HTMLSourceTracker.h"
#include "core/html/parser/HTMLToken.h"
#include "core/html/parser/HTMLTokenizer.h"
#include "core/html/parser/HTMLTreeBuilderSimulator.h"
#include "core/html/parser/XSSAuditor.h"
#include "core/html/parser/XSSAuditorDelegate.h"
#include "core/platform/text/SegmentedString.h"
#include "wtf/Deque.h"
#include "wtf/OwnPtr.h"
#include "wtf/WeakPtr.h"
#include "wtf/text/TextPosition.h"
namespace WebCore {
class BackgroundHTMLParser;
class CompactHTMLToken;
class Document;
class DocumentFragment;
class HTMLDocument;
class HTMLParserScheduler;
class HTMLScriptRunner;
class HTMLTreeBuilder;
class HTMLResourcePreloader;
class ScriptController;
class ScriptSourceCode;
class PumpSession;
class HTMLDocumentParser : public ScriptableDocumentParser, HTMLScriptRunnerHost, ResourceClient {
WTF_MAKE_FAST_ALLOCATED;
public:
static PassRefPtr<HTMLDocumentParser> create(Document* document, bool reportErrors)
{
return adoptRef(new HTMLDocumentParser(document, reportErrors));
}
virtual ~HTMLDocumentParser();
// Exposed for HTMLParserScheduler
void resumeParsingAfterYield();
static void parseDocumentFragment(const String&, DocumentFragment*, Element* contextElement, ParserContentPolicy = AllowScriptingContent);
HTMLTokenizer* tokenizer() const { return m_tokenizer.get(); }
virtual TextPosition textPosition() const;
virtual OrdinalNumber lineNumber() const;
virtual void suspendScheduledTasks();
virtual void resumeScheduledTasks();
struct ParsedChunk {
OwnPtr<CompactHTMLTokenStream> tokens;
PreloadRequestStream preloads;
XSSInfoStream xssInfos;
HTMLTokenizer::State tokenizerState;
HTMLTreeBuilderSimulator::State treeBuilderState;
HTMLInputCheckpoint inputCheckpoint;
TokenPreloadScannerCheckpoint preloadScannerCheckpoint;
};
void didReceiveParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
protected:
virtual void insert(const SegmentedString&) OVERRIDE;
virtual void append(PassRefPtr<StringImpl>) OVERRIDE;
virtual void finish() OVERRIDE;
HTMLDocumentParser(Document*, bool reportErrors);
HTMLDocumentParser(DocumentFragment*, Element* contextElement, ParserContentPolicy);
HTMLTreeBuilder* treeBuilder() const { return m_treeBuilder.get(); }
void forcePlaintextForTextDocument();
private:
static PassRefPtr<HTMLDocumentParser> create(DocumentFragment* fragment, Element* contextElement, ParserContentPolicy parserContentPolicy)
{
return adoptRef(new HTMLDocumentParser(fragment, contextElement, parserContentPolicy));
}
// DocumentParser
virtual void pinToMainThread() OVERRIDE;
virtual void detach() OVERRIDE;
virtual bool hasInsertionPoint() OVERRIDE;
virtual bool processingData() const OVERRIDE;
virtual void prepareToStopParsing() OVERRIDE;
virtual void stopParsing() OVERRIDE;
virtual bool isWaitingForScripts() const OVERRIDE;
virtual bool isExecutingScript() const OVERRIDE;
virtual void executeScriptsWaitingForResources() OVERRIDE;
// HTMLScriptRunnerHost
virtual void watchForLoad(Resource*) OVERRIDE;
virtual void stopWatchingForLoad(Resource*) OVERRIDE;
virtual HTMLInputStream& inputStream() { return m_input; }
virtual bool hasPreloadScanner() const { return m_preloadScanner.get() && !shouldUseThreading(); }
virtual void appendCurrentInputStreamToPreloadScannerAndScan() OVERRIDE;
// ResourceClient
virtual void notifyFinished(Resource*);
void startBackgroundParser();
void stopBackgroundParser();
void validateSpeculations(PassOwnPtr<ParsedChunk> lastChunk);
void discardSpeculationsAndResumeFrom(PassOwnPtr<ParsedChunk> lastChunk, PassOwnPtr<HTMLToken>, PassOwnPtr<HTMLTokenizer>);
void processParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
void pumpPendingSpeculations();
Document* contextForParsingSession();
enum SynchronousMode {
AllowYield,
ForceSynchronous,
};
bool canTakeNextToken(SynchronousMode, PumpSession&);
void pumpTokenizer(SynchronousMode);
void pumpTokenizerIfPossible(SynchronousMode);
void constructTreeFromHTMLToken(HTMLToken&);
void constructTreeFromCompactHTMLToken(const CompactHTMLToken&);
void runScriptsForPausedTreeBuilder();
void resumeParsingAfterScriptExecution();
void attemptToEnd();
void endIfDelayed();
void attemptToRunDeferredScriptsAndEnd();
void end();
bool shouldUseThreading() const { return m_options.useThreading && !m_isPinnedToMainThread; }
bool isParsingFragment() const;
bool isScheduledForResume() const;
bool inPumpSession() const { return m_pumpSessionNestingLevel > 0; }
bool shouldDelayEnd() const { return inPumpSession() || isWaitingForScripts() || isScheduledForResume() || isExecutingScript(); }
HTMLToken& token() { return *m_token; }
HTMLParserOptions m_options;
HTMLInputStream m_input;
OwnPtr<HTMLToken> m_token;
OwnPtr<HTMLTokenizer> m_tokenizer;
OwnPtr<HTMLScriptRunner> m_scriptRunner;
OwnPtr<HTMLTreeBuilder> m_treeBuilder;
OwnPtr<HTMLPreloadScanner> m_preloadScanner;
OwnPtr<HTMLPreloadScanner> m_insertionPreloadScanner;
OwnPtr<HTMLParserScheduler> m_parserScheduler;
HTMLSourceTracker m_sourceTracker;
TextPosition m_textPosition;
XSSAuditor m_xssAuditor;
XSSAuditorDelegate m_xssAuditorDelegate;
// FIXME: m_lastChunkBeforeScript, m_tokenizer, m_token, and m_input should be combined into a single state object
// so they can be set and cleared together and passed between threads together.
OwnPtr<ParsedChunk> m_lastChunkBeforeScript;
Deque<OwnPtr<ParsedChunk> > m_speculations;
WeakPtrFactory<HTMLDocumentParser> m_weakFactory;
WeakPtr<BackgroundHTMLParser> m_backgroundParser;
OwnPtr<HTMLResourcePreloader> m_preloader;
bool m_isPinnedToMainThread;
bool m_endWasDelayed;
bool m_haveBackgroundParser;
unsigned m_pumpSessionNestingLevel;
};
}
#endif
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