ExprParser.h

Go to the documentation of this file.

/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation; either version 2
 *   of the License, or (at your option) any later version.
 *
 *   This program 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
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Reto Grieder
 *   Co-authors:
 *      ...
 *
 */

#ifndef _FloatParser_H__
#define _FloatParser_H__

#include "UtilPrereqs.h"

#include <map>
#include <string>

namespace orxonox
{
    class _UtilExport ExprParser
    {
    public:
        enum binary_operator
        {
            b_plus,
            b_minus,
            mal,
            durch,
            modulo,
            hoch,
            undef,
            oder,
            und,
            gleich,
            b_nicht,
            kleiner,
            groesser,
            ungleich,
            kleinergleich,
            groessergleich
        };

        enum unary_operator
        {
            u_plus,
            u_minus,
            u_nicht
        };


        ExprParser();
        void parse(const std::string& str);
        const std::string& getRemains() { return  this->remains_; }
        float              getResult()  { return  this->result_; }
        bool               getSuccess() { return !this->failed_; }

        void setVariable(const std::string& varname, float value);

    private:
        float parse_expr_1();
        float parse_expr_2();
        float parse_expr_3();
        float parse_expr_4();
        float parse_expr_5();
        float parse_expr_6();
        float parse_expr_7();
        float parse_expr_8();
        void parse_word(char* str);
        binary_operator parse_binary_operator();
        unary_operator parse_unary_operator();

        float parse_argument();
        float parse_last_argument();

        binary_operator op;
        const char* reading_stream;
        bool failed_;
        float result_;
        std::string remains_;
        std::map<std::string, float> variables_;
    };

    //Endzeichen für float expression: ')', '}', ']', ',', ';'
    _UtilExport bool parse_float(char* const, char**, float*);
    //Endzeichen angegeben
    _UtilExport bool parse_float(char* const, char**, char, float*);
    //Letzter Teil-float eines Vektors parsen (keine Vergleichs- und Logikoperationen)
    _UtilExport bool parse_vector_float(char* const, char**, bool, float*);
}

#endif /* _FloatParser_H__ */