/usr/include/mapnik/util/geometry_wkt_generator.hpp is in libmapnik-dev 2.2.0+ds1-7+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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_GEOMETRY_WKT_GENERATOR_HPP
#define MAPNIK_GEOMETRY_WKT_GENERATOR_HPP
// mapnik
#include <mapnik/global.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/vertex.hpp> // for CommandType::SEG_MOVETO
// boost
#include <boost/tuple/tuple.hpp>
#include <boost/spirit/include/karma.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_fusion.hpp>
#include <boost/spirit/include/phoenix_function.hpp>
#include <boost/spirit/include/phoenix_statement.hpp>
#include <boost/fusion/include/boost_tuple.hpp>
#include <boost/type_traits/remove_pointer.hpp>
#include <boost/math/special_functions/trunc.hpp> // trunc to avoid needing C++11
//#define BOOST_SPIRIT_USE_PHOENIX_V3 1
namespace boost { namespace spirit { namespace traits {
// make gcc and darwin toolsets happy.
template <>
struct is_container<mapnik::geometry_container>
: mpl::false_
{};
}}}
namespace mapnik { namespace util {
namespace karma = boost::spirit::karma;
namespace phoenix = boost::phoenix;
namespace detail {
template <typename Geometry>
struct get_type
{
template <typename T>
struct result { typedef int type; };
int operator() (Geometry const& geom) const
{
return static_cast<int>(geom.type());
}
};
template <typename T>
struct get_first
{
typedef T geometry_type;
template <typename U>
struct result { typedef typename geometry_type::value_type const type; };
typename geometry_type::value_type const operator() (geometry_type const& geom) const
{
typename geometry_type::value_type coord;
geom.rewind(0);
boost::get<0>(coord) = geom.vertex(&boost::get<1>(coord),&boost::get<2>(coord));
return coord;
}
};
template <typename T>
struct multi_geometry_
{
typedef T geometry_container;
template <typename U>
struct result { typedef bool type; };
bool operator() (geometry_container const& geom) const
{
return geom.size() > 1 ? true : false;
}
};
template <typename T>
struct get_x
{
typedef T value_type;
template <typename U>
struct result { typedef double type; };
double operator() (value_type const& val) const
{
return boost::get<1>(val);
}
};
template <typename T>
struct get_y
{
typedef T value_type;
template <typename U>
struct result { typedef double type; };
double operator() (value_type const& val) const
{
return boost::get<2>(val);
}
};
template <typename T>
struct multi_geometry_type
{
typedef T geometry_container;
template <typename U>
struct result { typedef boost::tuple<unsigned,bool> type; };
boost::tuple<unsigned,bool> operator() (geometry_container const& geom) const;
};
template <typename T>
struct wkt_coordinate_policy : karma::real_policies<T>
{
typedef boost::spirit::karma::real_policies<T> base_type;
static int floatfield(T n) { return base_type::fmtflags::fixed; }
static unsigned precision(T n)
{
if (n == 0.0) return 0;
return 6;
//using namespace boost::spirit; // for traits
//return std::max(6u, static_cast<unsigned>(15 - boost::math::trunc(log10(traits::get_absolute_value(n)))));
}
template <typename OutputIterator>
static bool dot(OutputIterator& sink, T n, unsigned precision)
{
if (n == 0) return true;
return base_type::dot(sink, n, precision);
}
template <typename OutputIterator>
static bool fraction_part(OutputIterator& sink, T n
, unsigned adjprec, unsigned precision)
{
if (n == 0) return true;
return base_type::fraction_part(sink, n, adjprec, precision);
}
};
}
template <typename OutputIterator, typename Geometry>
struct wkt_generator :
karma::grammar<OutputIterator, Geometry const& ()>
{
typedef Geometry geometry_type;
typedef typename boost::remove_pointer<typename geometry_type::value_type>::type coord_type;
wkt_generator(bool single = false);
// rules
karma::rule<OutputIterator, geometry_type const& ()> wkt;
karma::rule<OutputIterator, geometry_type const& ()> point;
karma::rule<OutputIterator, geometry_type const& ()> linestring;
karma::rule<OutputIterator, geometry_type const& ()> polygon;
karma::rule<OutputIterator, geometry_type const& ()> coords;
karma::rule<OutputIterator, karma::locals<unsigned,double,double>, geometry_type const& ()> coords2;
karma::rule<OutputIterator, coord_type ()> point_coord;
karma::rule<OutputIterator, karma::locals<double,double>, coord_type (unsigned&, double&, double& )> polygon_coord;
// phoenix functions
phoenix::function<detail::get_type<geometry_type> > _type;
phoenix::function<detail::get_first<geometry_type> > _first;
phoenix::function<detail::get_x<typename geometry_type::value_type> > _x;
phoenix::function<detail::get_y<typename geometry_type::value_type> > _y;
//
karma::real_generator<double, detail::wkt_coordinate_policy<double> > coordinate;
};
template <typename OutputIterator, typename GeometryContainer>
struct wkt_multi_generator :
karma::grammar<OutputIterator, karma::locals< boost::tuple<unsigned,bool> >, GeometryContainer const& ()>
{
typedef GeometryContainer geometry_contaner;
typedef boost::remove_pointer<typename geometry_container::value_type>::type geometry_type;
wkt_multi_generator();
// rules
karma::rule<OutputIterator, karma::locals<boost::tuple<unsigned,bool> >, GeometryContainer const& ()> wkt;
karma::rule<OutputIterator, GeometryContainer const& ()> geometry;
karma::rule<OutputIterator, geometry_type const& ()> single_geometry;
karma::rule<OutputIterator, GeometryContainer const& ()> multi_geometry;
wkt_generator<OutputIterator, geometry_type > path;
// phoenix
phoenix::function<detail::multi_geometry_<GeometryContainer> > is_multi;
phoenix::function<detail::multi_geometry_type<GeometryContainer> > _multi_type;
phoenix::function<detail::get_type<geometry_type> > _type;
//
karma::symbols<unsigned, char const*> geometry_types;
};
}}
#endif // MAPNIK_GEOMETRY_WKT_GENERATOR_HPP
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