//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSGDB_FIELD
#define OSGDB_FIELD 1

#include <osg/Types>
#include <osgDB/Export>

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

namespace osgDB {


class OSGDB_EXPORT Field
{
    public:

        enum {
            MIN_CACHE_SIZE = 256
        };

        Field();
        Field(const Field& field);
        virtual ~Field();

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

        void reset();
        void addChar(char c);
        int getNoCharacters() const { return _fieldCacheSize; }

        void setWithinQuotes(bool withinQuotes=true);
        bool getWithinQuotes();

        void setNoNestedBrackets(int no);
        int getNoNestedBrackets();

        enum FieldType
        {
            OPEN_BRACKET,
            CLOSE_BRACKET,
            STRING,
            WORD,
            REAL,
            INTEGER,
            BLANK,
            UNINTIALISED
        };

        FieldType getFieldType() const;

        bool isValid() const;

        bool isOpenBracket() const;
        bool isCloseBracket() const;

        bool isWord() const;
        bool matchWord(const char* str) const;
        bool matchWord(const char* str,int noCharacters) const;

        bool isString() const;
        bool matchString(const char* str) const;
        bool matchString(const char* str,int noCharacters) const;
        bool isQuotedString() const;

        const char* getStr() const;
        char* takeStr();

        bool isInt() const;
        bool matchInt(int i) const;
        bool getInt(int& i) const;

        bool isUInt() const;
        bool matchUInt(osg::uint i) const;
        bool getUInt(osg::uint& i) const;

        bool isFloat() const;
        bool matchFloat(float f) const;
        bool getFloat(float& f) const;

        bool isDouble() const;
        bool matchDouble(double f) const;
        bool getDouble(double& d) const;

        static FieldType calculateFieldType(const char* str,bool withinQuotes=false);

    protected:

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

        int _fieldCacheCapacity;
        int _fieldCacheSize;
        char* _fieldCache;

        mutable FieldType _fieldType;

        bool _withinQuotes;

        int _noNestedBrackets;

};

}

#endif                                            // __SG_FIELD_H