//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSGDB_FIELDREADER
#define OSGDB_FIELDREADER 1

#include <osgDB/Export>

#include <string.h>
#include <stdlib.h>

#include <iostream>

namespace osgDB {

class Field;

class OSGDB_EXPORT FieldReader
{
    public:

        FieldReader();
        FieldReader(const FieldReader& ic);
        virtual ~FieldReader();

        virtual FieldReader& operator = (const FieldReader& ic);

        void attach(std::istream* input);
        void detach();

        virtual bool eof() const;

        bool readField(Field& fieldPtr);
        void ignoreField();
        
        /** no of unmatched `{' encountered so far in file*/
        int getNoNestedBrackets() const;

    private:

        bool _readField(Field* fieldPtr);

        void _init();
        void _free();
        void _copy(const FieldReader& ic);

        std::istream* _fin;
        bool _eof;

        bool findStartOfNextField();

        int _noNestedBrackets;

        bool _delimiterEatLookUp[256];
        bool _delimiterKeepLookUp[256];

};

}

#endif                                            // __SG_FIELD_READER_H