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remove expression optimizer for now since it is currently unused - refs #1002

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Dane Springmeyer 2013-09-18 19:19:41 -07:00
parent fc2280ffcf
commit b2d1363011
1 changed files with 0 additions and 134 deletions
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include/mapnik/expression_optimizer.hpp
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@ -1,134 +0,0 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2013 Artem Pavlenko
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_EXPRESSION_OPTIMIZER_HPP
#define MAPNIK_EXPRESSION_OPTIMIZER_HPP
// mapnik
#include <mapnik/attribute.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/expression_node.hpp>
// boost
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/get.hpp>
#include <tuple>
namespace mapnik
{
template <typename T>
struct optimize : boost::static_visitor< std::tuple<T,bool> >
{
typedef T node_type;
typedef std::tuple<node_type,bool> return_type;
return_type operator() (value const& v) const
{
return std::make_tuple(node_type(v),true);
}
return_type operator() (attribute const& attr) const
{
return std::make_tuple(node_type(attr),false);
}
return_type operator() (geometry_type_attribute const& attr) const
{
return return_type(node_type(attr),false);
}
return_type operator() (binary_node<tags::logical_and> const & x) const
{
return return_type(node_type(x),false);
// return (boost::apply_visitor(optimize<node_type>(),x.left).to_bool())
// && (boost::apply_visitor(optimize<node_type>(),x.right).to_bool());
}
return_type operator() (binary_node<tags::logical_or> const & x) const
{
return return_type(node_type(x),false);
// return (boost::apply_visitor(optimize<node_type>(),x.left).to_bool())
// || (boost::apply_visitor(optimize<node_type>(),x.right).to_bool());
}
template <typename Tag>
return_type operator() (binary_node<Tag> const& x) const
{
auto left = boost::apply_visitor(optimize<node_type>(),x.left);
auto right = boost::apply_visitor(optimize<node_type>(),x.right);
if (std::get<1>(left) && std::get<1>(right))
{
// evaluate
typename make_op<Tag>::type operation;
auto lv = boost::get<mapnik::value_type>(std::get<0>(left));
auto rv = boost::get<mapnik::value_type>(std::get<0>(right));
return return_type(node_type(operation(lv,rv)),true);
}
if (std::get<1>(right))
{
return return_type(node_type(binary_node<Tag>(std::get<0>(right),
std::get<0>(left))), false);
}
if (std::get<1>(left))
{
return return_type(node_type(binary_node<Tag>(std::get<0>(left),
std::get<0>(right))), false);
}
return return_type(node_type(x),false);
}
template <typename Tag>
return_type operator() (unary_node<Tag> const& x) const
{
//typename make_op<Tag>::type func;
//return func(boost::apply_visitor(*this, x.expr));
// return node_type(x);
return return_type(node_type(x),false);
}
return_type operator() (unary_node<tags::logical_not> const& x) const
{
// return node_type(x);
return return_type(node_type(x),false);
//return ! (boost::apply_visitor(optimize<node_type>(),x.expr).to_bool());
}
return_type operator() (regex_match_node const& x) const
{
return return_type(node_type(x),false);
// return boost::apply_visitor(optimize<node_type>(),x.expr);
}
return_type operator() (regex_replace_node const& x) const
{
return return_type(node_type(x),false);
//return boost::apply_visitor(optimize<node_type>(),x.expr);
}
};
}
#endif // MAPNIK_EXPRESSION_OPTIMIZER_HPP