include/dlvhex2/Term.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 TERM_HPP_INCLUDED__12102010
#define TERM_HPP_INCLUDED__12102010

#include "dlvhex2/PlatformDefinitions.h"
#include "dlvhex2/ID.h"
#include "dlvhex2/Logger.h"
#include "dlvhex2/fwd.h"

DLVHEX_NAMESPACE_BEGIN

struct DLVHEX_EXPORT Term:
private ostream_printable<Term>
{
    IDKind kind;

    // Anonymous variables: are parsed as one variable "_".
    // Then they are processed into new distinct variables,
    // each with the anonymous bit set and with a new ID.
    std::string symbol;

    std::vector<ID> arguments;

    Term(IDKind kind, const std::string& symbol): kind(kind), symbol(symbol) {
        assert(ID(kind,0).isTerm());

        arguments.push_back(ID_FAIL);
    }

    Term(IDKind kind, const std::vector<ID>& arguments, RegistryPtr reg);

    void updateSymbolOfNestedTerm(Registry* reg);

    bool isQuotedString() const
    {
        if ((symbol.at(0) == '"') && (symbol.at(symbol.length()-1) == '"'))
            return true;
        return false;
    }

    bool isNestedTerm() const
    {
        return arguments[0] != ID_FAIL;
    }

    std::string getQuotedString() const
    {
        return '"' + getUnquotedString() + '"';
    }

    std::string getUnquotedString() const
    {
        ;
        if (isQuotedString())
            return symbol.substr(1, symbol.length()-2);
        return symbol;
    }

    void analyzeTerm(RegistryPtr reg);

    std::ostream& print(std::ostream& o) const
    {
        return o << "Term(" << symbol << ")";
    }
};

DLVHEX_NAMESPACE_END
#endif                           // TERM_HPP_INCLUDED__12102010

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