JSON - add geometry_grammar_x3
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2 changed files with 206 additions and 0 deletions
51
include/mapnik/json/geometry_grammar_x3.hpp
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51
include/mapnik/json/geometry_grammar_x3.hpp
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/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2016 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_GEOMETRY_GRAMMAR_X3_HPP
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#define MAPNIK_GEOMETRY_GRAMMAR_X3_HPP
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// mapnik
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#include <mapnik/geometry.hpp> // for geometry_type
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/spirit/home/x3.hpp>
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#pragma GCC diagnostic pop
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// mapnik
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#include <mapnik/geometry.hpp>
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namespace mapnik { namespace json { namespace grammar {
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namespace x3 = boost::spirit::x3;
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using geometry_grammar_type = x3::rule<class geometry_grammar_tag, mapnik::geometry::geometry<double>>;
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BOOST_SPIRIT_DECLARE(geometry_grammar_type);
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}
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grammar::geometry_grammar_type const& geometry_grammar();
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}}
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#endif // MAPNIK_GEOMETRY_GRAMMAR_X3_HPP
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155
include/mapnik/json/geometry_grammar_x3_def.hpp
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include/mapnik/json/geometry_grammar_x3_def.hpp
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/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2016 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/json/geometry_grammar_x3.hpp>
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#include <mapnik/json/positions_grammar_x3.hpp>
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#include <mapnik/json/generic_json_grammar_x3.hpp>
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#include <mapnik/json/unicode_string_grammar_x3.hpp>
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#include <mapnik/json/create_geometry.hpp>
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#include <mapnik/geometry/fusion_adapted.hpp>
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#include <mapnik/util/noncopyable.hpp>
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#include <mapnik/util/windows_c2995.hpp>
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// boost
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#include <boost/fusion/include/std_pair.hpp>
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namespace mapnik { namespace json { namespace grammar {
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namespace x3 = boost::spirit::x3;
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using x3::lit;
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using x3::_pass;
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using x3::omit;
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auto create_geometry = [](auto const& ctx)
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{
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auto const& attr = _attr(ctx);
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mapnik::json::create_geometry_impl()(_val(ctx), std::get<0>(attr), std::get<1>(attr));
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};
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auto assign_element = [] (auto const& ctx)
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{
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_val(ctx) = std::move(_attr(ctx));
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};
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namespace {
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template <typename T>
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struct assign_geometry_element_visitor : util::noncopyable
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{
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assign_geometry_element_visitor(T & t)
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: t_(t) {}
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void operator() (int const& type)
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{
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std::get<0>(t_) = type;
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}
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void operator () (::mapnik::json::positions const& p)
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{
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std::get<1>(t_) = p;
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}
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T & t_;
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};
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}
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auto assign_geometry_element = [] (auto const& ctx)
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{
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assign_geometry_element_visitor<decltype(_val(ctx))> v(_val(ctx));
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mapnik::util::apply_visitor(v, _attr(ctx));
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};
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auto assign_collection = [] (auto const& ctx)
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{
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auto & val = _val(ctx);
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std::get<0>(val) = 7; //GeometryCollection
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std::get<1>(val) = std::move(_attr(ctx));
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};
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auto push_geometry = [] (auto const& ctx)
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{
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_val(ctx).emplace_back(std::move(_attr(ctx)));
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};
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// start rule
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geometry_grammar_type const geometry("Geometry");
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// rules
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x3::rule<class geometry_element_tag, mapnik::util::variant
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<int,
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mapnik::json::positions,
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mapnik::geometry::geometry_collection<double>> const geometry_element("Geometry Element");
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x3::rule<class geometry_tuple_tag, std::pair<int, mapnik::json::positions>> const geometry_tuple("Geometry Tuple");
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x3::rule<class geometry_collection_tag, mapnik::geometry::geometry_collection<double>> const geometry_collection("Geometry Collection");
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// import positions rule
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namespace { auto const& pos = positions_grammar(); }
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// import generic JSON key:value rule
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namespace { auto const& json_key_value = generic_json_key_value(); }
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struct geometry_type_ : x3::symbols<int>
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{
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geometry_type_()
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{
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add
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("\"Point\"",1)
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("\"LineString\"",2)
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("\"Polygon\"",3)
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("\"MultiPoint\"",4)
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("\"MultiLineString\"",5)
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("\"MultiPolygon\"",6)
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("\"GeometryCollection\"",7)
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;
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}
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} geometry_type;
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auto const geometry_def = (lit('{') > (geometry_tuple)[create_geometry] > lit('}')) | lit("null")
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;
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auto const geometry_tuple_def = geometry_element[assign_geometry_element] % lit(',')
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;
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auto const geometry_element_def =
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(lit("\"type\"") > lit(":") > geometry_type[assign_element])
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(lit("\"coordinates\"") > lit(':') > pos[assign_element])
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(lit("\"geometries\"") > lit(':') > lit('[') > geometry_collection[assign_collection] > lit(']'))
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omit[json_key_value]
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;
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auto const geometry_collection_def = geometry[push_geometry] % lit(',')
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;
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BOOST_SPIRIT_DEFINE(
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geometry,
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geometry_element,
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geometry_tuple,
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geometry_collection
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);
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}}}
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namespace mapnik { namespace json {
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grammar::geometry_grammar_type const& geometry_grammar()
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{
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return grammar::geometry;
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}
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}}
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