include/dlvhex2/SafetyChecker.h

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/* dlvhex -- Answer-Set Programming with external interfaces.
 * Copyright (C) 2005-2007 Roman Schindlauer
 * Copyright (C) 2006-2015 Thomas Krennwallner
 * Copyright (C) 2009-2016 Peter Schüller
 * Copyright (C) 2011-2016 Christoph Redl
 * Copyright (C) 2015-2016 Tobias Kaminski
 * Copyright (C) 2015-2016 Antonius Weinzierl
 *
 * This file is part of dlvhex.
 *
 * dlvhex is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * dlvhex 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with dlvhex; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

#ifndef _DLVHEX_SAFETYCHECKER_H
#define _DLVHEX_SAFETYCHECKER_H

#include "dlvhex2/PlatformDefinitions.h"
#include "dlvhex2/ProgramCtx.h"
#include "dlvhex2/Error.h"

DLVHEX_NAMESPACE_BEGIN

class DLVHEX_EXPORT SafetyCheckerBase
{
    protected:
        const ProgramCtx& ctx;

    public:
        SafetyCheckerBase(const ProgramCtx& ctx);
        virtual ~SafetyCheckerBase();

    public:

        virtual void
            operator() () const throw (SyntaxError) = 0;
};

class DLVHEX_EXPORT SafetyChecker : public SafetyCheckerBase
{
    public:
        SafetyChecker(const ProgramCtx& ctx);
        virtual ~SafetyChecker();

        virtual void
            operator() () const throw (SyntaxError);

        Tuple checkSafety(bool throwOnUnsafeVariables) const throw (SyntaxError);
};

class DLVHEX_EXPORT StrongSafetyChecker : public SafetyCheckerBase
{
    public:
        StrongSafetyChecker(const ProgramCtx& ctx);
        virtual ~StrongSafetyChecker();

        virtual void
            operator() () const throw (SyntaxError);
};

DLVHEX_NAMESPACE_END
#endif                           /* _DLVHEX_SAFETYCHECKER_H_ */


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