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/* vim: set sw=4 sts=4 et foldmethod=syntax : */

/*
 * Copyright (c) 2008, 2009 Ciaran McCreesh
 *
 * This file is part of the Paludis package manager. Paludis is free software;
 * you can redistribute it and/or modify it under the terms of the GNU General
 * Public License version 2, as published by the Free Software Foundation.
 *
 * Paludis 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., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <paludis/util/tribool.hh>
#include <paludis/util/exception.hh>
#include <paludis/util/stringify.hh>
#include <string>
#include <istream>
#include <ostream>

using namespace paludis;

Tribool::Tribool() :
    _value(v_false)
{
}

Tribool::Tribool(const bool b) :
    _value(b ? v_true : v_false)
{
}

Tribool::Tribool(TriboolIndeterminateValueType) :
    _value(v_indeterminate)
{
}

bool
Tribool::is_true() const
{
    return v_true == _value;
}

bool
Tribool::is_false() const
{
    return v_false == _value;
}

bool
Tribool::is_indeterminate() const
{
    return v_indeterminate == _value;
}

NoType<0u> *
paludis::indeterminate(const NoType<0u> * const)
{
    return 0;
}

std::ostream &
paludis::operator<< (std::ostream & s, const Tribool v)
{
    if (v.is_true())
        s << "true";
    else if (v.is_false())
        s << "false";
    else if (v.is_indeterminate())
        s << "indeterminate";
    else
        throw InternalError(PALUDIS_HERE, "Bad tribool");
    return s;
}

std::istream &
paludis::operator>> (std::istream & s, Tribool & a)
{
    std::string value;
    s >> value;

    do
    {
        if (value == "true")
        {
            a = true;
            break;
        }

        if (value == "false")
        {
            a = false;
            break;
        }

        if (value == "indeterminate")
        {
            a = indeterminate;
            break;
        }

        s.setstate(std::ios::badbit);
    } while (false);

    return s;
}