#ifndef LEXER_H
#define LEXER_H

#include <bu/stream.h>

class Token;

class Lexer
{
public:
    Lexer( Bu::Stream &rIn );
    virtual ~Lexer();

    enum Mode
    {
        modeNormal,
        modeCommand,
    };

    void setMode( Mode e ) { eMode = e; }
    Mode getMode() const { return eMode; }

    void nextToken();

    int getScale() const { return iScale; }
    void setScale( int i ) { iScale = i; }

    int getRadix() const { return iRadix; }
    void setRadix( int i );

    Token &operator[]( int iIdx );

private:
    void fillToken();
    Token nextTokenNormal();
    Token nextTokenCommand();

private:
    Bu::Stream &rIn;
    Bu::String sBuf;
    int iBufPos;
    int iScale;
    int iRadix;
    char numRangeTop;
    char ascRangeTop;
    Mode eMode;

    int iLookAheadSize;
    int iLookAheadUsed;
    int iLookAheadStart;
    Token *aLookAhead;
};

#endif