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364 lines
12 KiB
C++
364 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* MODULE NOTES:
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* @update gess 4/1/98
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*
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* The scanner is a low-level service class that knows
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* how to consume characters out of an (internal) stream.
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* This class also offers a series of utility methods
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* that most tokenizers want, such as readUntil()
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* and SkipWhitespace().
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*/
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#ifndef SCANNER
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#define SCANNER
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsIParser.h"
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#include "prtypes.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsScannerString.h"
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class nsParser;
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class nsReadEndCondition {
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public:
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const PRUnichar *mChars;
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PRUnichar mFilter;
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explicit nsReadEndCondition(const PRUnichar* aTerminateChars);
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private:
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nsReadEndCondition(const nsReadEndCondition& aOther); // No copying
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void operator=(const nsReadEndCondition& aOther); // No assigning
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};
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class nsScanner {
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public:
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/**
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* Use this constructor if you want i/o to be based on
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* a single string you hand in during construction.
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* This short cut was added for Javascript.
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*
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* @update ftang 3/02/99
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* @param aCharset charset
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* @param aCharsetSource - where the charset info came from
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* @param aMode represents the parser mode (nav, other)
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* @return
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*/
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nsScanner(const nsAString& anHTMLString, const nsACString& aCharset, PRInt32 aSource);
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/**
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* Use this constructor if you want i/o to be based on
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* a file (therefore a stream) or just data you provide via Append().
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*
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* @update ftang 3/02/99
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* @param aCharset charset
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* @param aCharsetSource - where the charset info came from
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* @param aMode represents the parser mode (nav, other)
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* @return
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*/
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nsScanner(nsString& aFilename,PRBool aCreateStream, const nsACString& aCharset, PRInt32 aSource);
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~nsScanner();
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/**
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* retrieve next char from internal input stream
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*
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* @update gess 3/25/98
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* @param ch is the char to accept new value
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* @return error code reflecting read status
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*/
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nsresult GetChar(PRUnichar& ch);
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/**
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* peek ahead to consume next char from scanner's internal
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* input buffer
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*
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* @update gess 3/25/98
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* @param ch is the char to accept new value
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* @return error code reflecting read status
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*/
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nsresult Peek(PRUnichar& ch, PRUint32 aOffset=0);
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nsresult Peek(nsAString& aStr, PRInt32 aNumChars, PRInt32 aOffset = 0);
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/**
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* Skip over chars as long as they equal given char
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*
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* @update gess 3/25/98
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* @param char to be skipped
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* @return error code
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*/
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nsresult SkipOver(PRUnichar aSkipChar);
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/**
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* Skip whitespace on scanner input stream
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*
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* @update gess 3/25/98
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* @return error status
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*/
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nsresult SkipWhitespace(PRInt32& aNewlinesSkipped);
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/**
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* Consume characters until you run into space, a '<', a '>', or a '/'.
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*
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* @param aString - receives new data from stream
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* @return error code
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*/
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nsresult ReadTagIdentifier(nsScannerSharedSubstring& aString);
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/**
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* Consume characters until you run into a char that's not valid in an
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* entity name
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*
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* @param aString - receives new data from stream
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* @return error code
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*/
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nsresult ReadEntityIdentifier(nsString& aString);
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nsresult ReadNumber(nsString& aString,PRInt32 aBase);
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nsresult ReadWhitespace(nsScannerSharedSubstring& aString,
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PRInt32& aNewlinesSkipped,
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PRBool& aHaveCR);
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nsresult ReadWhitespace(nsScannerIterator& aStart,
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nsScannerIterator& aEnd,
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PRInt32& aNewlinesSkipped);
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/**
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* Consume characters until you find the terminal char
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*
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* @update gess 3/25/98
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* @param aString receives new data from stream
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* @param aTerminal contains terminating char
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* @param addTerminal tells us whether to append terminal to aString
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* @return error code
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*/
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nsresult ReadUntil(nsAString& aString,
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PRUnichar aTerminal,
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PRBool addTerminal);
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/**
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* Consume characters until you find one contained in given
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* terminal set.
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*
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* @update gess 3/25/98
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* @param aString receives new data from stream
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* @param aTermSet contains set of terminating chars
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* @param addTerminal tells us whether to append terminal to aString
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* @return error code
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*/
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nsresult ReadUntil(nsAString& aString,
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const nsReadEndCondition& aEndCondition,
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PRBool addTerminal);
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nsresult ReadUntil(nsScannerSharedSubstring& aString,
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const nsReadEndCondition& aEndCondition,
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PRBool addTerminal);
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nsresult ReadUntil(nsScannerIterator& aStart,
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nsScannerIterator& aEnd,
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const nsReadEndCondition& aEndCondition,
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PRBool addTerminal);
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/**
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* Records current offset position in input stream. This allows us
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* to back up to this point if the need should arise, such as when
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* tokenization gets interrupted.
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*
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* @update gess 5/12/98
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* @param
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* @return
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*/
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PRInt32 Mark(void);
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/**
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* Resets current offset position of input stream to marked position.
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* This allows us to back up to this point if the need should arise,
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* such as when tokenization gets interrupted.
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* NOTE: IT IS REALLY BAD FORM TO CALL RELEASE WITHOUT CALLING MARK FIRST!
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*
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* @update gess 5/12/98
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* @param
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* @return
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*/
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void RewindToMark(void);
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/**
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*
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*
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* @update harishd 01/12/99
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* @param
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* @return
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*/
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PRBool UngetReadable(const nsAString& aBuffer);
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/**
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*
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*
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* @update gess 5/13/98
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* @param
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* @return
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*/
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nsresult Append(const nsAString& aBuffer);
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/**
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*
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*
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* @update gess 5/21/98
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* @param
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* @return
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*/
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nsresult Append(const char* aBuffer, PRUint32 aLen,
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nsIRequest *aRequest);
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/**
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* Call this to copy bytes out of the scanner that have not yet been consumed
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* by the tokenization process.
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*
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* @update gess 5/12/98
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* @param aCopyBuffer is where the scanner buffer will be copied to
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* @return nada
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*/
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void CopyUnusedData(nsString& aCopyBuffer);
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/**
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* Retrieve the name of the file that the scanner is reading from.
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* In some cases, it's just a given name, because the scanner isn't
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* really reading from a file.
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*
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* @update gess 5/12/98
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* @return
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*/
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nsString& GetFilename(void);
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static void SelfTest();
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/**
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* Use this setter to change the scanner's unicode decoder
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*
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* @update ftang 3/02/99
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* @param aCharset a normalized (alias resolved) charset name
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* @param aCharsetSource- where the charset info came from
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* @return
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*/
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nsresult SetDocumentCharset(const nsACString& aCharset, PRInt32 aSource);
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void BindSubstring(nsScannerSubstring& aSubstring, const nsScannerIterator& aStart, const nsScannerIterator& aEnd);
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void CurrentPosition(nsScannerIterator& aPosition);
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void EndReading(nsScannerIterator& aPosition);
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void SetPosition(nsScannerIterator& aPosition,
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PRBool aTruncate = PR_FALSE,
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PRBool aReverse = PR_FALSE);
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void ReplaceCharacter(nsScannerIterator& aPosition,
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PRUnichar aChar);
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/**
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* Internal method used to cause the internal buffer to
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* be filled with data.
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*
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* @update gess4/3/98
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*/
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PRBool IsIncremental(void) {return mIncremental;}
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void SetIncremental(PRBool anIncrValue) {mIncremental=anIncrValue;}
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/**
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* Return the position of the first non-whitespace
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* character. This is only reliable before consumers start
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* reading from this scanner.
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*/
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PRInt32 FirstNonWhitespacePosition()
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{
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return mFirstNonWhitespacePosition;
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}
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void SetParser(nsParser *aParser)
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{
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mParser = aParser;
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}
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/**
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* Override replacement character used by nsIUnicodeDecoder.
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* Default behavior is that it uses nsIUnicodeDecoder's mapping.
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*
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* @param aReplacementCharacter the replacement character
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* XML (expat) parser uses 0xffff
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*/
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void OverrideReplacementCharacter(PRUnichar aReplacementCharacter);
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protected:
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PRBool AppendToBuffer(nsScannerString::Buffer *, nsIRequest *aRequest, PRInt32 aErrorPos = -1);
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PRBool AppendToBuffer(const nsAString& aStr)
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{
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nsScannerString::Buffer* buf = nsScannerString::AllocBufferFromString(aStr);
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if (!buf)
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return PR_FALSE;
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AppendToBuffer(buf, nsnull);
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return PR_TRUE;
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}
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nsScannerString* mSlidingBuffer;
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nsScannerIterator mCurrentPosition; // The position we will next read from in the scanner buffer
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nsScannerIterator mMarkPosition; // The position last marked (we may rewind to here)
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nsScannerIterator mEndPosition; // The current end of the scanner buffer
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nsScannerIterator mFirstInvalidPosition; // The position of the first invalid character that was detected
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nsString mFilename;
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PRUint32 mCountRemaining; // The number of bytes still to be read
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// from the scanner buffer
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PRPackedBool mIncremental;
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PRPackedBool mHasInvalidCharacter;
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PRUnichar mReplacementCharacter;
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PRInt32 mFirstNonWhitespacePosition;
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PRInt32 mCharsetSource;
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nsCString mCharset;
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nsCOMPtr<nsIUnicodeDecoder> mUnicodeDecoder;
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nsParser *mParser;
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private:
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nsScanner &operator =(const nsScanner &); // Not implemented.
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};
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#endif
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