include/dlvhex2/Error.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.
 */

#if !defined(_DLVHEX_ERROR_H)
#define _DLVHEX_ERROR_H

#include "dlvhex2/PlatformDefinitions.h"

#include <string>
#include <iosfwd>
#include <stdexcept>

DLVHEX_NAMESPACE_BEGIN

class DLVHEX_EXPORT GeneralError : public std::runtime_error
{
    public:

        explicit
            GeneralError(const std::string& msg);

        virtual ~GeneralError() throw() {}

        virtual std::string
            getErrorMsg() const
        {
            return this->what();
        }
};

class DLVHEX_EXPORT SyntaxError : public GeneralError
{
    public:

        explicit
            SyntaxError(const std::string& msg,
            const unsigned line = 0,
            const std::string& file = "");

        virtual ~SyntaxError() throw() {};

        virtual std::string
            getErrorMsg() const;

        void
            setLine(unsigned line);

        void
            setFile(const std::string& file);

    private:
        unsigned line;
        std::string file;
};

class DLVHEX_EXPORT FatalError : public GeneralError
{
    public:

        explicit
            FatalError(const std::string& msg);

};

class DLVHEX_EXPORT PluginError : public GeneralError
{
    public:

        explicit
            PluginError(const std::string& msg);

        virtual ~PluginError() throw() {};

        void
            setContext(const std::string& ctx);

        virtual std::string
            getErrorMsg() const;

    private:
        std::string context;
};

// thrown to give error message about wrong usage of commandline of program or plugin
// (you should give a usage help message when catching this)
class UsageError: public FatalError
{
    public:
        UsageError(const std::string& msg):
        FatalError(msg) {}
        virtual ~UsageError() throw() {}
};

DLVHEX_NAMESPACE_END
#endif                           /* _DLVHEX_ERROR_H */


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