505 lines
17 KiB
C++
505 lines
17 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) 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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#include "process_geojson_file_x3.hpp"
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <boost/interprocess/streams/bufferstream.hpp>
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#include <boost/spirit/home/x3.hpp>
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#pragma GCC diagnostic pop
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#include <mapnik/mapped_memory_cache.hpp>
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#else
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#include <mapnik/util/file_io.hpp>
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#endif
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#include <mapnik/feature.hpp>
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#include <mapnik/json/json_grammar_config.hpp>
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#include <mapnik/json/geojson_grammar_x3_def.hpp>
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#include <mapnik/json/unicode_string_grammar_x3_def.hpp>
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#include <mapnik/json/positions_grammar_x3_def.hpp>
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namespace {
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constexpr mapnik::json::well_known_names feature_properties[] = {
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mapnik::json::well_known_names::type,
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mapnik::json::well_known_names::geometry,
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mapnik::json::well_known_names::properties}; // sorted
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constexpr mapnik::json::well_known_names geometry_properties[] = {
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mapnik::json::well_known_names::type,
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mapnik::json::well_known_names::coordinates}; // sorted
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template <typename Keys>
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std::string join(Keys const& keys)
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{
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std::string result;
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bool first = true;
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for (auto const& key : keys)
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{
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if (!first) result += ",";
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result += "\"" + std::string(mapnik::json::wkn_to_string(key)) + "\"";
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first = false;
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}
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return result;
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}
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template <typename Iterator, typename Keys>
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bool has_keys(Iterator first1, Iterator last1, Keys const& keys)
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{
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auto first2 = std::begin(keys);
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auto last2 = std::end(keys);
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for (; first2 != last2; ++first1)
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{
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if (first1 == last1 || *first2 < std::get<0>(*first1))
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return false;
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if (!(std::get<0>(*first1) < *first2))
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++first2;
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}
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return true;
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}
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template <typename Keys>
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bool validate_geojson_feature(mapnik::json::geojson_value & value, Keys const& keys, bool verbose)
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{
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if (!value.is<mapnik::json::geojson_object>())
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{
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if (verbose) std::clog << "Expecting an GeoJSON object" << std::endl;
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return false;
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}
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mapnik::json::geojson_object & feature = mapnik::util::get<mapnik::json::geojson_object>(value);
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std::sort(feature.begin(), feature.end(), [](auto const& e0, auto const& e1)
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{
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return std::get<0>(e0) < std::get<0>(e1);
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});
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if (!has_keys(feature.begin(), feature.end(), feature_properties))
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{
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if (verbose) std::clog << "Expecting one of " << join(feature_properties) << std::endl;
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return false;
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}
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for (auto & elem : feature)
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{
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auto const key = std::get<0>(elem);
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if (key == mapnik::json::well_known_names::geometry)
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{
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auto & geom_value = std::get<1>(elem);
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if (!geom_value.is<mapnik::json::geojson_object>())
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{
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if (verbose) std::clog << "\"geometry\": xxx <-- expecting an JSON object here" << std::endl;
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return false;
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}
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auto & geometry = mapnik::util::get<mapnik::json::geojson_object>(geom_value);
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// sort by property name
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std::sort(geometry.begin(), geometry.end(), [](auto const& e0, auto const& e1)
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{
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return std::get<0>(e0) < std::get<0>(e1);
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});
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if (!has_keys(geometry.begin(), geometry.end(), geometry_properties))
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{
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if (verbose) std::clog << "Expecting one of " << join(geometry_properties) << std::endl;
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return false;
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}
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mapnik::geometry::geometry_types geom_type;
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mapnik::json::positions const* coordinates = nullptr;
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for (auto & elem2 : geometry)
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{
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auto const key2 = std::get<0>(elem2);
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if (key2 == mapnik::json::well_known_names::type)
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{
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auto const& geom_type_value = std::get<1>(elem2);
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if (!geom_type_value.is<mapnik::geometry::geometry_types>())
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{
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if (verbose) std::clog << "\"type\": xxx <-- expecting an GeoJSON geometry type here" << std::endl;
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return false;
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}
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geom_type = mapnik::util::get<mapnik::geometry::geometry_types>(geom_type_value);
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if (geom_type == mapnik::geometry::geometry_types::GeometryCollection)
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{
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if (verbose) std::clog << "GeometryCollections are not allowed" << std::endl;;
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return false;
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}
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}
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else if (key2 == mapnik::json::well_known_names::coordinates)
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{
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auto const& coordinates_value = std::get<1>(elem2);
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if (!coordinates_value.is<mapnik::json::positions>())
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{
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if (verbose) std::clog << "\"coordinates\": xxx <-- expecting an GeoJSON positions here" << std::endl;
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return false;
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}
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coordinates = &mapnik::util::get<mapnik::json::positions>(coordinates_value);
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}
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}
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if (geom_type == mapnik::geometry::geometry_types::Point)
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{
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// expecting single position
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if (!coordinates->is<mapnik::json::point>())
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{
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if (verbose) std::clog << "Expecting single position in Point" << std::endl;
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return false;
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}
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}
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else if (geom_type == mapnik::geometry::geometry_types::LineString)
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{
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// expecting
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if (!coordinates->is<mapnik::json::ring>())
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{
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if (verbose) std::clog << "Expecting sequence of positions (ring) in LineString" << std::endl;
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return false;
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}
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else
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{
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auto const& ring = mapnik::util::get<mapnik::json::ring>(*coordinates);
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if (ring.size() < 2)
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{
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if (verbose) std::clog << "Expecting at least two coordinates in LineString" << std::endl;
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return false;
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}
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}
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}
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else if (geom_type == mapnik::geometry::geometry_types::Polygon)
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{
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// expecting
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if (!coordinates->is<mapnik::json::rings>())
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{
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if (verbose) std::clog << "Expecting an array of rings in Polygon" << std::endl;
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return false;
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}
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else
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{
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auto const& rings = mapnik::util::get<mapnik::json::rings>(*coordinates);
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if (rings.size() < 1)
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{
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if (verbose) std::clog << "Expecting at least one ring in Polygon" << std::endl;
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return false;
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}
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for (auto const& ring : rings)
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{
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if (ring.size() < 4)
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{
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if (verbose) std::clog << "Expecting at least four coordinates in Polygon ring" << std::endl;
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return false;
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}
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}
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}
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}
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}
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}
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return true;
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};
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using box_type = mapnik::box2d<float>;
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using boxes_type = std::vector<std::pair<box_type, std::pair<std::size_t, std::size_t>>>;
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using base_iterator_type = char const*;
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}
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namespace mapnik { namespace json {
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template <typename Box>
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struct calculate_bounding_box
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{
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calculate_bounding_box(Box & box)
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: box_(box) {}
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void operator()(mapnik::json::point const& pt) const
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{
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box_.init(pt.x, pt.y);
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}
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void operator()(mapnik::json::ring const& ring) const
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{
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for (auto const& pt : ring)
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{
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if (!box_.valid()) box_.init(pt.x, pt.y);
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else box_.expand_to_include(pt.x, pt.y);
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}
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}
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void operator()(mapnik::json::rings const& rings) const
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{
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for (auto const& ring : rings)
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{
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operator()(ring);
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break; // consider first ring only
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}
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}
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void operator()(mapnik::json::rings_array const& rings_array) const
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{
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for (auto const& rings : rings_array)
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{
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operator()(rings);
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}
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}
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template <typename T>
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void operator() (T const& ) const {}
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Box & box_;
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};
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namespace grammar {
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namespace x3 = boost::spirit::x3;
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using x3::lit;
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using x3::omit;
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using x3::raw;
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using x3::char_;
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using x3::eps;
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struct feature_callback_tag;
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auto on_feature_callback = [] (auto const& ctx)
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{
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// call our callback
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x3::get<feature_callback_tag>(ctx)(_attr(ctx));
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};
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namespace {
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auto const& geojson_value = geojson_grammar();
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}
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// extract bounding box from GeoJSON Feature
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struct bracket_tag ;
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auto check_brackets = [](auto const& ctx)
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{
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_pass(ctx) = (x3::get<bracket_tag>(ctx) > 0);
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};
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auto open_bracket = [](auto const& ctx)
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{
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++x3::get<bracket_tag>(ctx);
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};
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auto close_bracket = [](auto const& ctx)
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{
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--x3::get<bracket_tag>(ctx);
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};
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auto assign_range = [](auto const& ctx)
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{
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std::get<0>(_val(ctx)) = std::move(_attr(ctx));
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};
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auto assign_bbox = [](auto const& ctx)
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{
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std::get<1>(_val(ctx)) = std::move(_attr(ctx));
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};
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auto extract_bounding_box = [](auto const& ctx)
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{
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mapnik::box2d<float> bbox;
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calculate_bounding_box<mapnik::box2d<float>> visitor(bbox);
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mapnik::util::apply_visitor(visitor, _attr(ctx));
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_val(ctx) = std::move(bbox);
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};
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auto const coordinates_rule = x3::rule<struct coordinates_rule_tag, mapnik::box2d<float> > {}
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= lit("\"coordinates\"") >> lit(':') >> positions_rule[extract_bounding_box];
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auto const bounding_box = x3::rule<struct bounding_box_rule_tag, std::tuple<boost::iterator_range<base_iterator_type>,mapnik::box2d<float>>> {}
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= raw[lit('{')[open_bracket] >> *(eps[check_brackets] >>
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(lit("\"FeatureCollection\"") > eps(false)
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lit('{')[open_bracket]
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lit('}')[close_bracket]
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coordinates_rule[assign_bbox]
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omit[geojson_string]
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omit[char_]))][assign_range];
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auto const feature = bounding_box[on_feature_callback];
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auto const key_value_ = omit[geojson_string] > lit(':') > omit[geojson_value] ;
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auto const features = lit("\"features\"")
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> lit(':') > lit('[') > -(omit[feature] % lit(',')) > lit(']');
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auto const type = lit("\"type\"") > lit(':') > lit("\"FeatureCollection\"");
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auto const feature_collection = x3::rule<struct feature_collection_tag> {}
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= lit('{') > (( type | features | key_value_) % lit(',')) > lit('}');
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}}}
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namespace {
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struct collect_features
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{
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collect_features(std::vector<mapnik::json::geojson_value> & values)
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: values_(values) {}
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void operator() (mapnik::json::geojson_value && val) const
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{
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values_.push_back(std::move(val));
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}
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std::vector<mapnik::json::geojson_value> & values_;
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};
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template <typename Iterator, typename Boxes>
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struct extract_positions
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{
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extract_positions(Iterator start, Boxes & boxes)
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: start_(start),
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boxes_(boxes) {}
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template <typename T>
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void operator() (T const& val) const
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{
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auto const& r = std::get<0>(val);
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mapnik::box2d<float> const& bbox = std::get<1>(val);
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auto offset = std::distance(start_, r.begin());
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auto size = std::distance(r.begin(), r.end());
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boxes_.emplace_back(std::make_pair(bbox,std::make_pair(offset, size)));
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//boxes_.emplace_back(std::make_tuple(bbox,offset, size));
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}
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Iterator start_;
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Boxes & boxes_;
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};
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}
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namespace mapnik { namespace detail {
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template <typename T>
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std::pair<bool,typename T::value_type::first_type> process_geojson_file_x3(T & boxes, std::string const& filename, bool validate_features, bool verbose)
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{
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using box_type = typename T::value_type::first_type;
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box_type extent;
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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mapnik::mapped_region_ptr mapped_region;
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boost::optional<mapnik::mapped_region_ptr> memory =
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mapnik::mapped_memory_cache::instance().find(filename, true);
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if (!memory)
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{
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std::clog << "Error : cannot memory map " << filename << std::endl;
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return std::make_pair(false, extent);
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}
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else
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{
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mapped_region = *memory;
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}
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base_iterator_type start = reinterpret_cast<base_iterator_type>(mapped_region->get_address());
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base_iterator_type end = start + mapped_region->get_size();
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#else
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mapnik::util::file file(filename);
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if (!file)
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{
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std::clog << "Error : cannot open " << filename << std::endl;
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return std::make_pair(false, extent);
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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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std::fread(&file_buffer[0], file.size(), 1, file.get());
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base_iterator_type start = file_buffer.c_str();
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base_iterator_type end = start + file_buffer.length();
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#endif
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using namespace boost::spirit;
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using space_type = mapnik::json::grammar::space_type;
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auto const* itr = start;
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extract_positions<base_iterator_type, boxes_type> callback(itr, boxes);
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auto keys = mapnik::json::get_keys();
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std::size_t bracket_counter = 0;
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auto feature_collection_impl = x3::with<mapnik::json::grammar::bracket_tag>(std::ref(bracket_counter))
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[x3::with<mapnik::json::keys_tag>(std::ref(keys))
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[x3::with<mapnik::json::grammar::feature_callback_tag>(std::ref(callback))
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[mapnik::json::grammar::feature_collection]
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]];
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try
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{
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bool result = x3::phrase_parse(itr, end, feature_collection_impl, space_type());
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if (!result)
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{
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std::clog << "mapnik-index (GeoJSON) : could not extract bounding boxes from : '" << filename << "'" << std::endl;
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return std::make_pair(false, extent);
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}
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}
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catch (x3::expectation_failure<base_iterator_type> const& ex)
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{
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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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return std::make_pair(false, extent);
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}
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catch (std::exception const& ex)
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{
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std::clog << "Exception caught:" << ex.what() << std::endl;
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return std::make_pair(false, extent);
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}
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auto feature_grammar = x3::with<mapnik::json::keys_tag>(std::ref(keys))
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[ mapnik::json::grammar::geojson_value ];
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for (auto const& item : boxes)
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{
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if (item.first.valid())
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{
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if (!extent.valid()) extent = item.first;
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else extent.expand_to_include(item.first);
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if (validate_features)
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{
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base_iterator_type feat_itr = start + item.second.first;
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base_iterator_type feat_end = feat_itr + item.second.second;
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mapnik::json::geojson_value feature_value;
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try
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{
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bool result = x3::phrase_parse(feat_itr, feat_end, feature_grammar, space_type(), feature_value);
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if (!result || feat_itr != feat_end)
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{
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if (verbose) std::clog << std::string(start + item.second.first, feat_end ) << std::endl;
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return std::make_pair(false, extent);
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}
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}
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catch (x3::expectation_failure<std::string::const_iterator> const& ex)
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{
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if (verbose) std::clog << ex.what() << std::endl;
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return std::make_pair(false, extent);
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}
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catch (...)
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{
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return std::make_pair(false, extent);
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}
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if (!validate_geojson_feature(feature_value, keys, verbose))
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{
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return std::make_pair(false, extent);
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}
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}
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}
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}
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return std::make_pair(true, extent);
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}
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template std::pair<bool,box_type> process_geojson_file_x3(boxes_type&, std::string const&, bool, bool);
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}}
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