/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGDB_FIELDREADER
#define OSGDB_FIELDREADER 1

#include <osgDB/Export>

#include <istream>

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