Formula.h

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/*
 * Copyright (C) 2008 Kamil Dudka <xdudka00@stud.fit.vutbr.cz>
 *
 * This file is part of fss (Fast SAT Solver).
 *
 * fss 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 3 of the License, or
 * any later version.
 *
 * fss 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 fss.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef FOROMULA_H
#define FOROMULA_H

#include "SatProblem.h"


namespace FastSatSolver {

  class IFormulaBuilder
  {
    public:
      virtual ~IFormulaBuilder() { }

      virtual int parse (Token token ) = 0;

      virtual bool isValid ( ) = 0;
  };

  class IFormulaEvaluator
  {
    public:
      virtual ~IFormulaEvaluator() { }

      virtual bool eval (ISatItem *data ) = 0;
  };

  class InterpretedFormula:
      public IFormulaBuilder,
      public IFormulaEvaluator
  {
    public:
      InterpretedFormula();
      ~InterpretedFormula();

      int parse (Token token );

      bool isValid ( );
      
      bool eval (ISatItem *data );

    private:
      struct Private;
      Private *const d;
  };


} // namespace FastSatSolver


#endif // FOROMULA_H

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