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/* vim: set sw=4 sts=4 et foldmethod=syntax : */
/*
* Copyright (c) 2010, 2011 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/resolver/reason_utils.hh>
#include <paludis/resolver/reason.hh>
using namespace paludis;
using namespace paludis::resolver;
namespace
{
struct IsTargetVisitor
{
bool visit(const DependencyReason &) const
{
return false;
}
bool visit(const DependentReason &) const
{
return false;
}
bool visit(const WasUsedByReason &) const
{
return false;
}
bool visit(const PresetReason &) const
{
return false;
}
bool visit(const ViaBinaryReason &) const
{
return false;
}
bool visit(const TargetReason &) const
{
return true;
}
bool visit(const LikeOtherDestinationTypeReason & r) const
{
return r.reason_for_other()->accept_returning<bool>(*this);
}
bool visit(const SetReason & r) const
{
return r.reason_for_set()->accept_returning<bool>(*this);
}
};
struct FromIDVisitor
{
std::shared_ptr<const PackageID> visit(const DependencyReason & r) const
{
return r.from_id();
}
std::shared_ptr<const PackageID> visit(const DependentReason &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const WasUsedByReason &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const PresetReason &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const ViaBinaryReason &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const TargetReason &) const
{
return nullptr;
}
std::shared_ptr<const PackageID> visit(const LikeOtherDestinationTypeReason & r) const
{
return r.reason_for_other()->accept_returning<std::shared_ptr<const PackageID> >(*this);
}
std::shared_ptr<const PackageID> visit(const SetReason & r) const
{
return r.reason_for_set()->accept_returning<std::shared_ptr<const PackageID> >(*this);
}
};
}
bool
paludis::resolver::is_target(const std::shared_ptr<const Reason> & reason)
{
IsTargetVisitor v;
return reason->accept_returning<bool>(v);
}
const std::shared_ptr<const PackageID>
paludis::resolver::maybe_from_package_id_from_reason(const std::shared_ptr<const Reason> & reason)
{
FromIDVisitor v;
return reason->accept_returning<std::shared_ptr<const PackageID> >(v);
}
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