e7c3d04309
format all files Revert "format all files" This reverts commit 95d5812e49e7f916b68e786596f5a8eb5bcac414. Revert "format some files" This reverts commit ed3c8762d4d828b2b28e7b18809fc33f4f8ccaf5. format all files fix formatting in dir include fix formatting of debug macro
292 lines
9 KiB
C++
292 lines
9 KiB
C++
/*****************************************************************************
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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) 2021 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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#include "topojson_datasource.hpp"
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#include "topojson_featureset.hpp"
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#include <fstream>
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#include <algorithm>
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// boost
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#include <boost/algorithm/string.hpp>
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// mapnik
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#include <mapnik/unicode.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/geometry/box2d.hpp>
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#include <mapnik/geometry/boost_adapters.hpp>
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#include <mapnik/json/topojson_grammar_x3.hpp>
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#include <mapnik/json/topojson_utils.hpp>
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#include <mapnik/util/variant.hpp>
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#include <mapnik/util/file_io.hpp>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(topojson_datasource)
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struct attr_value_converter
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{
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mapnik::eAttributeType operator()(mapnik::value_integer /*val*/) const { return mapnik::Integer; }
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mapnik::eAttributeType operator()(double /*val*/) const { return mapnik::Double; }
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mapnik::eAttributeType operator()(float /*val*/) const { return mapnik::Double; }
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mapnik::eAttributeType operator()(bool /*val*/) const { return mapnik::Boolean; }
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// string, object, array
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template<typename T>
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mapnik::eAttributeType operator()(T const& /*val*/) const
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{
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return mapnik::String;
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}
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};
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struct geometry_type_visitor
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{
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int operator()(mapnik::topojson::point const&) const
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{
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return static_cast<int>(mapnik::datasource_geometry_t::Point);
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}
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int operator()(mapnik::topojson::multi_point const&) const
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{
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return static_cast<int>(mapnik::datasource_geometry_t::Point);
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}
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int operator()(mapnik::topojson::linestring const&) const
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{
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return static_cast<int>(mapnik::datasource_geometry_t::LineString);
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}
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int operator()(mapnik::topojson::multi_linestring const&) const
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{
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return static_cast<int>(mapnik::datasource_geometry_t::LineString);
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}
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int operator()(mapnik::topojson::polygon const&) const
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{
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return static_cast<int>(mapnik::datasource_geometry_t::Polygon);
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}
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int operator()(mapnik::topojson::multi_polygon const&) const
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{
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return static_cast<int>(mapnik::datasource_geometry_t::Polygon);
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}
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template<typename T>
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int operator()(T const&) const
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{
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return 0;
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}
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};
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struct collect_attributes_visitor
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{
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mapnik::layer_descriptor& desc_;
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collect_attributes_visitor(mapnik::layer_descriptor& desc)
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: desc_(desc)
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{}
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// no-op
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void operator()(mapnik::topojson::empty) {}
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//
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template<typename GeomType>
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void operator()(GeomType const& g)
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{
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if (g.props)
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{
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for (auto const& p : *g.props)
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{
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desc_.add_descriptor(
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mapnik::attribute_descriptor(std::get<0>(p),
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mapnik::util::apply_visitor(attr_value_converter(), std::get<1>(p))));
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}
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}
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}
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};
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topojson_datasource::topojson_datasource(parameters const& params)
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: datasource(params)
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, type_(datasource::Vector)
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, desc_(topojson_datasource::name(), *params.get<std::string>("encoding", "utf-8"))
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, filename_()
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, inline_string_()
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, extent_()
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, tr_(new mapnik::transcoder(*params.get<std::string>("encoding", "utf-8")))
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, tree_(nullptr)
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{
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boost::optional<std::string> inline_string = params.get<std::string>("inline");
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if (inline_string)
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{
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inline_string_ = *inline_string;
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}
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else
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{
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boost::optional<std::string> file = params.get<std::string>("file");
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if (!file)
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throw mapnik::datasource_exception("TopoJSON Plugin: missing <file> parameter");
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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filename_ = *base + "/" + *file;
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else
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filename_ = *file;
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}
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if (!inline_string_.empty())
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{
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parse_topojson(inline_string_.c_str());
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}
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else
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{
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mapnik::util::file file(filename_);
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if (!file)
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{
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throw mapnik::datasource_exception("TopoJSON Plugin: could not open: '" + filename_ + "'");
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}
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std::string file_buffer;
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file_buffer.resize(file.size());
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auto count = std::fread(&file_buffer[0], file.size(), 1, file.get());
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if (count == 1)
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parse_topojson(file_buffer.c_str());
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}
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}
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template<typename T>
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void topojson_datasource::parse_topojson(T const& buffer)
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{
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auto itr = buffer;
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auto end = buffer + std::strlen(buffer);
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using space_type = boost::spirit::x3::standard::space_type;
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try
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{
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boost::spirit::x3::phrase_parse(itr, end, mapnik::json::grammar::topology, space_type(), topo_);
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} catch (boost::spirit::x3::expectation_failure<char const*> const& ex)
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{
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std::clog << "failed to parse TopoJSON..." << std::endl;
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std::clog << ex.what() << std::endl;
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std::clog << "Expected: " << ex.which();
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std::clog << " Got: \"" << std::string(ex.where(), ex.where() + 200) << "...\"" << std::endl;
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throw mapnik::datasource_exception("topojson_datasource: Failed parse TopoJSON file '" + filename_ + "'");
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}
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using values_container = std::vector<std::pair<box_type, std::size_t>>;
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values_container values;
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values.reserve(topo_.geometries.size());
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std::size_t geometry_index = 0;
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bool first = true;
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for (auto const& geom : topo_.geometries)
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{
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mapnik::box2d<double> box = mapnik::util::apply_visitor(mapnik::topojson::bounding_box_visitor(topo_), geom);
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if (box.valid())
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{
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if (first)
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{
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first = false;
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extent_ = box;
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collect_attributes_visitor assessor(desc_);
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mapnik::util::apply_visitor(std::ref(assessor), geom);
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}
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else
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{
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extent_.expand_to_include(box);
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}
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values.emplace_back(box, geometry_index);
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}
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++geometry_index;
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}
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// packing algorithm
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tree_ = std::make_unique<spatial_index_type>(values);
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}
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topojson_datasource::~topojson_datasource() {}
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const char* topojson_datasource::name()
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{
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return "topojson";
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}
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boost::optional<mapnik::datasource_geometry_t> topojson_datasource::get_geometry_type() const
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{
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boost::optional<mapnik::datasource_geometry_t> result;
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int multi_type = 0;
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std::size_t num_features = topo_.geometries.size();
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for (std::size_t i = 0; i < num_features && i < 5; ++i)
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{
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mapnik::topojson::geometry const& geom = topo_.geometries[i];
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int type = mapnik::util::apply_visitor(geometry_type_visitor(), geom);
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if (type > 0)
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{
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if (multi_type > 0 && multi_type != type)
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{
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result.reset(mapnik::datasource_geometry_t::Collection);
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return result;
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}
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else
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{
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result.reset(static_cast<mapnik::datasource_geometry_t>(type));
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}
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multi_type = type;
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}
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}
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return result;
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}
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mapnik::datasource::datasource_t topojson_datasource::type() const
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{
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return type_;
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}
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mapnik::box2d<double> topojson_datasource::envelope() const
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{
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return extent_;
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}
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mapnik::layer_descriptor topojson_datasource::get_descriptor() const
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{
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return desc_;
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}
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mapnik::featureset_ptr topojson_datasource::features(mapnik::query const& q) const
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{
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// if the query box intersects our world extent then query for features
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mapnik::box2d<double> const& box = q.get_bbox();
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if (extent_.intersects(box))
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{
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topojson_featureset::array_type index_array;
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if (tree_)
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{
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tree_->query(boost::geometry::index::intersects(box), std::back_inserter(index_array));
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return std::make_shared<topojson_featureset>(topo_, *tr_, std::move(index_array));
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}
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}
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// otherwise return an empty featureset pointer
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return mapnik::make_invalid_featureset();
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}
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mapnik::featureset_ptr topojson_datasource::features_at_point(mapnik::coord2d const& pt, double tol) const
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{
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mapnik::box2d<double> query_bbox(pt, pt);
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query_bbox.pad(tol);
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mapnik::query q(query_bbox);
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for (auto const& attr_info : desc_.get_descriptors())
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{
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q.add_property_name(attr_info.get_name());
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}
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return features(q);
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}
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