зеркало из https://github.com/mozilla/gecko-dev.git
137 строки
3.4 KiB
C++
137 строки
3.4 KiB
C++
/*
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* Copyright (C) 1998 Rick Gessner. All Rights 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 CSCANNER_
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#define CSCANNER_
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#include "SharedTypes.h"
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#include "nsString.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 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(istream& aStream);
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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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int 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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int 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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int push(PRUnichar ch);
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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 true upon eof condition
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*/
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int endOfFile(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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int readUntil(nsCString& aString,PRUnichar aTerminal,bool 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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int readUntil(nsCString& aString,nsCString& aTermSet,bool 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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int readWhile(nsCString& aString,nsCString& anInputSet,bool addTerminal);
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protected:
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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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int fillBuffer(void);
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istream& mFileStream;
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nsCString mBuffer;
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int mOffset;
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int mTotalRead;
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bool mIncremental;
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};
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#endif
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