/usr/include/mapnik/json/geometry_generator_grammar.hpp is in libmapnik-dev 2.2.0+ds1-6build2.
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) 2012 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_JSON_GEOMETRY_GENERATOR_GRAMMAR_HPP
#define MAPNIK_JSON_GEOMETRY_GENERATOR_GRAMMAR_HPP
// mapnik
#include <mapnik/global.hpp>
#include <mapnik/geometry.hpp>
#include <mapnik/util/path_iterator.hpp>
#include <mapnik/util/container_adapter.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/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 json {
namespace karma = boost::spirit::karma;
namespace phoenix = boost::phoenix;
namespace {
struct get_type
{
template <typename T>
struct result { typedef int type; };
int operator() (geometry_type const& geom) const
{
return static_cast<int>(geom.type());
}
};
struct get_first
{
template <typename T>
struct result { typedef geometry_type::value_type const type; };
geometry_type::value_type const operator() (geometry_type const& geom) const
{
geometry_type::value_type coord;
boost::get<0>(coord) = geom.vertex(0,&boost::get<1>(coord),&boost::get<2>(coord));
return coord;
}
};
struct multi_geometry_type
{
template <typename T>
struct result { typedef boost::tuple<unsigned,bool> type; };
boost::tuple<unsigned,bool> operator() (geometry_container const& geom) const
{
unsigned type = 0u;
bool collection = false;
geometry_container::const_iterator itr = geom.begin();
geometry_container::const_iterator end = geom.end();
for ( ; itr != end; ++itr)
{
if (type != 0u && itr->type() != type)
{
collection = true;
break;
}
type = itr->type();
}
if (geom.size() > 1) type +=3;
return boost::tuple<unsigned,bool>(type, collection);
}
};
template <typename T>
struct json_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;
using namespace boost::spirit;
return 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>
struct geometry_generator_grammar :
karma::grammar<OutputIterator, geometry_type const& ()>
{
geometry_generator_grammar()
: geometry_generator_grammar::base_type(coordinates)
{
using boost::spirit::karma::uint_;
using boost::spirit::karma::_val;
using boost::spirit::karma::_1;
using boost::spirit::karma::lit;
using boost::spirit::karma::_a;
using boost::spirit::karma::_r1;
using boost::spirit::karma::eps;
coordinates = point | linestring | polygon
;
point = &uint_(mapnik::Point)[_1 = _type(_val)]
<< point_coord [_1 = _first(_val)]
;
linestring = &uint_(mapnik::LineString)[_1 = _type(_val)]
<< lit('[')
<< coords
<< lit(']')
;
polygon = &uint_(mapnik::Polygon)[_1 = _type(_val)]
<< lit('[')
<< coords2
<< lit("]]")
;
point_coord = &uint_
<< lit('[')
<< coord_type << lit(',') << coord_type
<< lit("]")
;
polygon_coord %= ( &uint_(mapnik::SEG_MOVETO) << eps[_r1 += 1]
<< karma::string[ if_ (_r1 > 1) [_1 = "],["]
.else_[_1 = '[' ]] | &uint_ << lit(','))
<< lit('[') << coord_type
<< lit(',')
<< coord_type << lit(']')
;
coords2 %= *polygon_coord(_a)
;
coords = point_coord % lit(',')
;
}
// rules
karma::rule<OutputIterator, geometry_type const& ()> coordinates;
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>, geometry_type const& ()> coords2;
karma::rule<OutputIterator, geometry_type::value_type ()> point_coord;
karma::rule<OutputIterator, geometry_type::value_type (unsigned& )> polygon_coord;
// phoenix functions
phoenix::function<get_type > _type;
phoenix::function<get_first> _first;
//
karma::real_generator<double, json_coordinate_policy<double> > coord_type;
};
template <typename OutputIterator>
struct multi_geometry_generator_grammar :
karma::grammar<OutputIterator, karma::locals<boost::tuple<unsigned,bool> >,
geometry_container const& ()>
{
multi_geometry_generator_grammar()
: multi_geometry_generator_grammar::base_type(start)
{
using boost::spirit::karma::lit;
using boost::spirit::karma::eps;
using boost::spirit::karma::_val;
using boost::spirit::karma::_1;
using boost::spirit::karma::_a;
using boost::spirit::karma::_r1;
geometry_types.add
(mapnik::Point,"\"Point\"")
(mapnik::LineString,"\"LineString\"")
(mapnik::Polygon,"\"Polygon\"")
(mapnik::Point + 3,"\"MultiPoint\"")
(mapnik::LineString + 3,"\"MultiLineString\"")
(mapnik::Polygon + 3,"\"MultiPolygon\"")
;
start %= ( eps(phoenix::at_c<1>(_a))[_a = _multi_type(_val)]
<< lit("{\"type\":\"GeometryCollection\",\"geometries\":[")
<< geometry_collection << lit("]}")
|
geometry)
;
geometry_collection = -(geometry2 % lit(','))
;
geometry = (lit("{\"type\":")
<< geometry_types[_1 = phoenix::at_c<0>(_a)][_a = _multi_type(_val)]
<< lit(",\"coordinates\":")
<< karma::string[ if_ (phoenix::at_c<0>(_a) > 3) [_1 = '[']]
<< coordinates
<< karma::string[ if_ (phoenix::at_c<0>(_a) > 3) [_1 = ']']]
<< lit('}')) | lit("null")
;
geometry2 = lit("{\"type\":")
<< geometry_types[_1 = _a][_a = type_(_val)]
<< lit(",\"coordinates\":")
<< path
<< lit('}')
;
coordinates %= path % lit(',')
;
}
// rules
karma::rule<OutputIterator, karma::locals<boost::tuple<unsigned,bool> >,
geometry_container const&()> start;
karma::rule<OutputIterator, karma::locals<boost::tuple<unsigned,bool> >,
geometry_container const&()> geometry_collection;
karma::rule<OutputIterator, karma::locals<boost::tuple<unsigned,bool> >,
geometry_container const&()> geometry;
karma::rule<OutputIterator, karma::locals<unsigned>,
geometry_type const&()> geometry2;
karma::rule<OutputIterator, geometry_container const&()> coordinates;
geometry_generator_grammar<OutputIterator> path;
// phoenix
phoenix::function<multi_geometry_type> _multi_type;
phoenix::function<get_type > type_;
// symbols table
karma::symbols<unsigned, char const*> geometry_types;
};
}}
#endif // MAPNIK_JSON_GEOMETRY_GENERATOR_GRAMMAR_HPP
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