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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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#ifndef _SCANNER_HXX
#define _SCANNER_HXX

#include <tools/string.hxx>
#ifndef _SBERRORS_HXX
#include <basic/sberrors.hxx>
#endif

// Der Scanner ist stand-alone, d.h. er kann von ueberallher verwendet
// werden. Eine BASIC-Instanz ist fuer Fehlermeldungen notwendig. Ohne
// BASIC werden die Fehler nur gezaehlt. Auch ist Basic notwendig, wenn
// eine erweiterte SBX-Variable zur Erkennung von Datentypen etc. verwendet
// werden soll.

class StarBASIC;

class SbiScanner
{
    ::rtl::OUString   aBuf;				// Input-Puffer
	::rtl::OUString   aLine;			// aktuelle Zeile
	const sal_Unicode* pLine;			// Pointer
	const sal_Unicode* pSaveLine;		// Merker fuer Line
protected:
	String aSym;						// Symbolpuffer
	String aError;						// Fehler-String
	SbxDataType eScanType;				// evtl. Datentyp
	StarBASIC* pBasic;					// Instanz fuer Fehler-Callbacks
	double nVal; 						// numerischer Wert
	short  nCurCol1;  			   		// aktuelle Spalte 1
	short  nSavedCol1;					// gerettete Spalte 1
	short  nCol; 						// aktuelle Spaltennummer
	short  nErrors;						// Anzahl Fehler
	short  nColLock;					// Lock-Zaehler fuer Col1
	sal_Int32  nBufPos;						// aktuelle Buffer-Pos
	sal_uInt16 nLine;						// aktuelle Zeile
	sal_uInt16 nCol1, nCol2;				// aktuelle 1. und 2. Spalte
	sal_Bool   bSymbol;						// sal_True: Symbol gescannt
	sal_Bool   bNumber;						// sal_True: Zahl gescannt
	sal_Bool   bSpaces;						// sal_True: Whitespace vor Token
	sal_Bool   bErrors;						// sal_True: Fehler generieren
	sal_Bool   bAbort;						// sal_True: abbrechen
	sal_Bool   bHash;						// sal_True: # eingelesen
	sal_Bool   bError;						// sal_True: Fehler generieren
	sal_Bool   bUsedForHilite;				// sal_True: Nutzung fuer Highlighting
	sal_Bool   bCompatible; 				// sal_True: OPTION Compatibl
	sal_Bool   bVBASupportOn;				// sal_True: OPTION VBASupport 1 otherwise default False
	sal_Bool   bPrevLineExtentsComment;		// sal_True: Previous line is comment and ends on "... _"

	void   GenError( SbError );
public:
    SbiScanner( const ::rtl::OUString&, StarBASIC* = NULL );
   ~SbiScanner();

	void  EnableErrors()   			{ bError = sal_False; }
	sal_Bool  IsHash()					{ return bHash;   }
	sal_Bool  IsCompatible()			{ return bCompatible; }
	void  SetCompatible( bool b )	{ bCompatible = b; }		// #118206
	sal_Bool  IsVBASupportOn()			{ return bVBASupportOn; }
	void  SetVBASupportOn( bool b )	{ bVBASupportOn = b; }
	sal_Bool  WhiteSpace()				{ return bSpaces; }
	short GetErrors()				{ return nErrors; }
	short GetLine()					{ return nLine;   }
	short GetCol1()					{ return nCol1;   }
	short GetCol2()					{ return nCol2;   }
	void  SetCol1( short n )		{ nCol1 = n; 	  }
	StarBASIC* GetBasic()			{ return pBasic;  }
	void  SaveLine(void)			{ pSaveLine = pLine; }
	void  RestoreLine(void)			{ pLine = pSaveLine; }
	void  LockColumn();
	void  UnlockColumn();
	sal_Bool  DoesColonFollow();

	sal_Bool NextSym();					// naechstes Symbol lesen
	const String& GetSym()			{ return aSym;	}
	SbxDataType GetType()		   	{ return eScanType; }
	double	  GetDbl()				{ return nVal;	}
};

class LetterTable
{
	bool		IsLetterTab[256];

public:
	LetterTable( void );

	inline bool isLetter( sal_Unicode c )
	{
		bool bRet = (c < 256) ? IsLetterTab[c] : isLetterUnicode( c );
		return bRet;
	}
	bool isLetterUnicode( sal_Unicode c );
};

class BasicSimpleCharClass
{
	static LetterTable aLetterTable;

public:
	static sal_Bool isAlpha( sal_Unicode c, bool bCompatible )
	{
		sal_Bool bRet = (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') 
					|| (bCompatible && aLetterTable.isLetter( c ));
		return bRet;
	}

	static sal_Bool isDigit( sal_Unicode c )
	{
		sal_Bool bRet = (c >= '0' && c <= '9');
		return bRet;
	}

	static sal_Bool isAlphaNumeric( sal_Unicode c, bool bCompatible )
	{
		sal_Bool bRet = isDigit( c ) || isAlpha( c, bCompatible );
		return bRet;
	}
};

#endif