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gecko/parser/html/nsHtml5StreamParser.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* 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 of 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 nsHtml5StreamParser_h__
#define nsHtml5StreamParser_h__
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsIStreamListener.h"
#include "nsICharsetDetectionObserver.h"
#include "nsHtml5MetaScanner.h"
#include "nsIUnicodeDecoder.h"
#include "nsHtml5TreeOpExecutor.h"
#include "nsHtml5UTF16Buffer.h"
#include "nsIInputStream.h"
#include "nsICharsetAlias.h"
#include "mozilla/Mutex.h"
#include "nsHtml5AtomTable.h"
#include "nsHtml5Speculation.h"
#include "nsITimer.h"
#include "nsICharsetDetector.h"
class nsHtml5Parser;
#define NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE 1024
#define NS_HTML5_STREAM_PARSER_SNIFFING_BUFFER_SIZE 1024
enum eBomState {
/**
* BOM sniffing hasn't started.
*/
BOM_SNIFFING_NOT_STARTED = 0,
/**
* BOM sniffing is ongoing, and the first byte of an UTF-16LE BOM has been
* seen.
*/
SEEN_UTF_16_LE_FIRST_BYTE = 1,
/**
* BOM sniffing is ongoing, and the first byte of an UTF-16BE BOM has been
* seen.
*/
SEEN_UTF_16_BE_FIRST_BYTE = 2,
/**
* BOM sniffing is ongoing, and the first byte of an UTF-8 BOM has been
* seen.
*/
SEEN_UTF_8_FIRST_BYTE = 3,
/**
* BOM sniffing is ongoing, and the first and second bytes of an UTF-8 BOM
* have been seen.
*/
SEEN_UTF_8_SECOND_BYTE = 4,
/**
* BOM sniffing was started but is now over for whatever reason.
*/
BOM_SNIFFING_OVER = 5
};
enum eHtml5StreamState {
STREAM_NOT_STARTED = 0,
STREAM_BEING_READ = 1,
STREAM_ENDED = 2
};
class nsHtml5StreamParser : public nsIStreamListener,
public nsICharsetDetectionObserver {
friend class nsHtml5RequestStopper;
friend class nsHtml5DataAvailable;
friend class nsHtml5StreamParserContinuation;
friend class nsHtml5TimerKungFu;
public:
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsHtml5StreamParser, nsIStreamListener)
static void InitializeStatics();
nsHtml5StreamParser(nsHtml5TreeOpExecutor* aExecutor,
nsHtml5Parser* aOwner);
virtual ~nsHtml5StreamParser();
// nsIRequestObserver methods:
NS_DECL_NSIREQUESTOBSERVER
// nsIStreamListener methods:
NS_DECL_NSISTREAMLISTENER
// nsICharsetDetectionObserver
/**
* Chardet calls this to report the detection result
*/
NS_IMETHOD Notify(const char* aCharset, nsDetectionConfident aConf);
// EncodingDeclarationHandler
// http://hg.mozilla.org/projects/htmlparser/file/tip/src/nu/validator/htmlparser/common/EncodingDeclarationHandler.java
/**
* Tree builder uses this to report a late <meta charset>
*/
PRBool internalEncodingDeclaration(nsString* aEncoding);
// Not from an external interface
/**
* Call this method once you've created a parser, and want to instruct it
* about what charset to load
*
* @param aCharset the charset of a document
* @param aCharsetSource the source of the charset
*/
inline void SetDocumentCharset(const nsACString& aCharset, PRInt32 aSource) {
NS_PRECONDITION(mStreamState == STREAM_NOT_STARTED,
"SetDocumentCharset called too late.");
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mCharset = aCharset;
mCharsetSource = aSource;
}
inline void SetObserver(nsIRequestObserver* aObserver) {
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
mObserver = aObserver;
}
nsresult GetChannel(nsIChannel** aChannel);
/**
* The owner parser must call this after script execution
* when no scripts are executing and the document.written
* buffer has been exhausted.
*/
void ContinueAfterScripts(nsHtml5Tokenizer* aTokenizer,
nsHtml5TreeBuilder* aTreeBuilder,
PRBool aLastWasCR);
/**
* Continues the stream parser if the charset switch failed.
*/
void ContinueAfterFailedCharsetSwitch();
void Terminate() {
mozilla::MutexAutoLock autoLock(mTerminatedMutex);
mTerminated = PR_TRUE;
}
void DropTimer();
private:
#ifdef DEBUG
PRBool IsParserThread() {
PRBool ret;
mThread->IsOnCurrentThread(&ret);
return ret;
}
#endif
/**
* Marks the stream parser as interrupted. If you ever add calls to this
* method, be sure to review Uninterrupt usage very, very carefully to
* avoid having a previous in-flight runnable cancel your Interrupt()
* call on the other thread too soon.
*/
void Interrupt() {
mozilla::MutexAutoLock autoLock(mTerminatedMutex);
mInterrupted = PR_TRUE;
}
void Uninterrupt() {
NS_ASSERTION(IsParserThread(), "Wrong thread!");
mTokenizerMutex.AssertCurrentThreadOwns();
// Not acquiring mTerminatedMutex because mTokenizerMutex is already
// held at this point and is already stronger.
mInterrupted = PR_FALSE;
}
/**
* Flushes the tree ops from the tree builder and disarms the flush
* timer.
*/
void FlushTreeOpsAndDisarmTimer();
void ParseAvailableData();
void DoStopRequest();
void DoDataAvailable(PRUint8* aBuffer, PRUint32 aLength);
PRBool IsTerminatedOrInterrupted() {
mozilla::MutexAutoLock autoLock(mTerminatedMutex);
return mTerminated || mInterrupted;
}
PRBool IsTerminated() {
mozilla::MutexAutoLock autoLock(mTerminatedMutex);
return mTerminated;
}
/**
* True when there is a Unicode decoder already
*/
inline PRBool HasDecoder() {
return !!mUnicodeDecoder;
}
/**
* Push bytes from network when there is no Unicode decoder yet
*/
nsresult SniffStreamBytes(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Push bytes from network when there is a Unicode decoder already
*/
nsresult WriteStreamBytes(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Check whether every other byte in the sniffing buffer is zero.
*/
void SniffBOMlessUTF16BasicLatin(const PRUint8* aFromSegment,
PRUint32 aCountToSniffingLimit);
/**
* <meta charset> scan failed. Try chardet if applicable. After this, the
* the parser will have some encoding even if a last resolt fallback.
*
* @param aFromSegment The current network buffer or null if the sniffing
* buffer is being flushed due to network stream ending.
* @param aCount The number of bytes in aFromSegment (ignored if
* aFromSegment is null)
* @param aWriteCount Return value for how many bytes got read from the
* buffer.
* @param aCountToSniffingLimit The number of unfilled slots in
* mSniffingBuffer
*/
nsresult FinalizeSniffing(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount,
PRUint32 aCountToSniffingLimit);
/**
* Set up the Unicode decoder and write the sniffing buffer into it
* followed by the current network buffer.
*
* @param aFromSegment The current network buffer or null if the sniffing
* buffer is being flushed due to network stream ending.
* @param aCount The number of bytes in aFromSegment (ignored if
* aFromSegment is null)
* @param aWriteCount Return value for how many bytes got read from the
* buffer.
*/
nsresult SetupDecodingAndWriteSniffingBufferAndCurrentSegment(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Write the sniffing buffer into the Unicode decoder followed by the
* current network buffer.
*
* @param aFromSegment The current network buffer or null if the sniffing
* buffer is being flushed due to network stream ending.
* @param aCount The number of bytes in aFromSegment (ignored if
* aFromSegment is null)
* @param aWriteCount Return value for how many bytes got read from the
* buffer.
*/
nsresult WriteSniffingBufferAndCurrentSegment(const PRUint8* aFromSegment,
PRUint32 aCount,
PRUint32* aWriteCount);
/**
* Initialize the Unicode decoder, mark the BOM as the source and
* drop the sniffer.
*
* @param aCharsetName The charset name to report to the outside (UTF-16
* or UTF-8)
* @param aDecoderCharsetName The actual name for the decoder's charset
* (UTF-16BE, UTF-16LE or UTF-8; the BOM has
* been swallowed)
*/
nsresult SetupDecodingFromBom(const char* aCharsetName,
const char* aDecoderCharsetName);
/**
* Callback for mFlushTimer.
*/
static void TimerCallback(nsITimer* aTimer, void* aClosure);
/**
* Parser thread entry point for (maybe) flushing the ops and posting
* a flush runnable back on the main thread.
*/
void TimerFlush();
nsCOMPtr<nsIRequest> mRequest;
nsCOMPtr<nsIRequestObserver> mObserver;
/**
* The Unicode decoder
*/
nsCOMPtr<nsIUnicodeDecoder> mUnicodeDecoder;
/**
* The buffer for sniffing the character encoding
*/
nsAutoArrayPtr<PRUint8> mSniffingBuffer;
/**
* The number of meaningful bytes in mSniffingBuffer
*/
PRUint32 mSniffingLength;
/**
* BOM sniffing state
*/
eBomState mBomState;
/**
* <meta> prescan implementation
*/
nsAutoPtr<nsHtml5MetaScanner> mMetaScanner;
// encoding-related stuff
/**
* The source (confidence) of the character encoding in use
*/
PRInt32 mCharsetSource;
/**
* The character encoding in use
*/
nsCString mCharset;
/**
* Whether reparse is forbidden
*/
PRBool mReparseForbidden;
// Portable parser objects
/**
* The first buffer in the pending UTF-16 buffer queue
*/
nsRefPtr<nsHtml5UTF16Buffer> mFirstBuffer;
/**
* The last buffer in the pending UTF-16 buffer queue
*/
nsHtml5UTF16Buffer* mLastBuffer; // weak ref; always points to
// a buffer of the size NS_HTML5_STREAM_PARSER_READ_BUFFER_SIZE
/**
* The tree operation executor
*/
nsHtml5TreeOpExecutor* mExecutor;
/**
* The HTML5 tree builder
*/
nsAutoPtr<nsHtml5TreeBuilder> mTreeBuilder;
/**
* The HTML5 tokenizer
*/
nsAutoPtr<nsHtml5Tokenizer> mTokenizer;
/**
* Makes sure the main thread can't mess the tokenizer state while it's
* tokenizing. This mutex also protects the current speculation.
*/
mozilla::Mutex mTokenizerMutex;
/**
* The scoped atom table
*/
nsHtml5AtomTable mAtomTable;
/**
* The owner parser.
*/
nsRefPtr<nsHtml5Parser> mOwner;
/**
* Whether the last character tokenized was a carriage return (for CRLF)
*/
PRBool mLastWasCR;
/**
* For tracking stream life cycle
*/
eHtml5StreamState mStreamState;
/**
* Whether we are speculating.
*/
PRBool mSpeculating;
/**
* Whether the tokenizer has reached EOF. (Reset when stream rewinded.)
*/
PRBool mAtEOF;
/**
* The speculations. The mutex protects the nsTArray itself.
* To access the queue of current speculation, mTokenizerMutex must be
* obtained.
* The current speculation is the last element
*/
nsTArray<nsAutoPtr<nsHtml5Speculation> > mSpeculations;
mozilla::Mutex mSpeculationMutex;
/**
* True to terminate early; protected by mTerminatedMutex
*/
PRBool mTerminated;
PRBool mInterrupted;
mozilla::Mutex mTerminatedMutex;
/**
* The thread this stream parser runs on.
*/
nsCOMPtr<nsIThread> mThread;
nsCOMPtr<nsIRunnable> mExecutorFlusher;
nsCOMPtr<nsIRunnable> mLoadFlusher;
/**
* The chardet instance if chardet is enabled.
*/
nsCOMPtr<nsICharsetDetector> mChardet;
/**
* If false, don't push data to chardet.
*/
PRBool mFeedChardet;
/**
* Timer for flushing tree ops once in a while when not speculating.
*/
nsCOMPtr<nsITimer> mFlushTimer;
/**
* Keeps track whether mFlushTimer has been armed. Unfortunately,
* nsITimer doesn't enable querying this from the timer itself.
*/
PRBool mFlushTimerArmed;
/**
* False initially and true after the timer has fired at least once.
*/
PRBool mFlushTimerEverFired;
/**
* The pref html5.flushtimer.initialdelay: Time in milliseconds between
* the time a network buffer is seen and the timer firing when the
* timer hasn't fired previously in this parse.
*/
static PRInt32 sTimerInitialDelay;
/**
* The pref html5.flushtimer.subsequentdelay: Time in milliseconds between
* the time a network buffer is seen and the timer firing when the
* timer has already fired previously in this parse.
*/
static PRInt32 sTimerSubsequentDelay;
};
#endif // nsHtml5StreamParser_h__
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