281 lines
7.8 KiB
C++
281 lines
7.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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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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* readWhile() and SkipWhitespace().
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*/
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#ifndef SCANNER
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#define SCANNER
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#include "nsString.h"
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#include "nsParserTypes.h"
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#include "prtypes.h"
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#include <fstream.h>
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class CScanner {
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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 gess 5/12/98
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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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CScanner(nsString& anHTMLString);
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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 gess 5/12/98
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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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CScanner(nsString& aFilename,PRBool aCreateStream);
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/**
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* Use this constructor if you want i/o to be stream based.
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*
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* @update gess 5/12/98
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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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CScanner(nsString& aFilename,fstream& aStream,PRBool assumeOwnership=PR_TRUE);
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~CScanner();
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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);
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/**
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* Push the given char back onto the scanner
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*
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* @update gess 3/25/98
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* @param character to be pushed
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* @return error code
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*/
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nsresult PutBack(PRUnichar ch);
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/**
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* Skip over chars as long as they're in aSkipSet
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*
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* @update gess 3/25/98
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* @param set of chars to be skipped
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* @return error code
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*/
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nsresult SkipOver(nsString& SkipChars);
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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 over chars until they're in aValidSet
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*
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* @update gess 3/25/98
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* @param aValid set contains chars you're looking for
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* @return error code
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*/
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nsresult SkipTo(nsString& aValidSet);
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/**
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* Skip over chars as long as they're in aSequence
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*
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* @update gess 3/25/98
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* @param contains sequence to be skipped
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* @return error code
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*/
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nsresult SkipPast(nsString& aSequence);
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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(void);
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/**
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* Determine if the scanner has reached EOF.
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* This method can also cause the buffer to be filled
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* if it happens to be empty
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*
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* @update gess 3/25/98
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* @return PR_TRUE upon eof condition
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*/
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nsresult Eof(void);
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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(nsString& aString,PRUnichar aTerminal,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(nsString& aString,nsString& aTermSet,PRBool anOrderedSet,PRBool addTerminal);
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/**
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* Consume characters while they're members of anInputSet
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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 anInputSet contains valid 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 ReadWhile(nsString& aString,nsString& anInputSet,PRBool anOrderedSet,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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PRInt32 RewindToMark(void);
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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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PRBool Append(nsString& 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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PRBool Append(const char* aBuffer, PRInt32 aLen);
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/**
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*
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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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nsString& GetBuffer(void);
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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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protected:
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enum {eBufferSizeThreshold=512};
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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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nsresult FillBuffer(void);
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fstream* mFileStream;
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nsString mBuffer;
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nsString mFilename;
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PRInt32 mOffset;
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PRInt32 mMarkPos;
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PRInt32 mTotalRead;
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PRBool mOwnsStream;
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PRBool mIncremental;
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};
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#endif
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