refactor GeoJSON bounding box extraction into separate method for re-use and more...
This commit is contained in:
artemp
parent
20d6f84b3b
commit
ed5ee69c3c
8 changed files with 309 additions and 204 deletions
35
include/mapnik/json/extract_bounding_boxes_x3.hpp
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35
include/mapnik/json/extract_bounding_boxes_x3.hpp
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@ -0,0 +1,35 @@
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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_JSON_EXTRACT_BOUNDING_BOXES_X3_HPP
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#define MAPNIK_JSON_EXTRACT_BOUNDING_BOXES_X3_HPP
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namespace mapnik { namespace json {
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template <typename Iterator, typename Boxes>
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void extract_bounding_boxes(Iterator start, Iterator end, Boxes & boxes);
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}}
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#endif // MAPNIK_JSON_EXTRACT_BOUNDING_BOXES_X3_HPP
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@ -23,6 +23,8 @@
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#ifndef MAPNIK_JSON_GRAMMAR_CONFIG_HPP
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#define MAPNIK_JSON_GRAMMAR_CONFIG_HPP
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#include <mapnik/feature.hpp>
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#include <mapnik/unicode.hpp>
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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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@ -59,6 +61,8 @@ constexpr char const* wkn_to_string(well_known_names val)
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}
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struct keys_tag;
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struct transcoder_tag;
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struct feature_tag;
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using keys_map = boost::bimap<boost::bimaps::unordered_set_of<std::string>,
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boost::bimaps::set_of<int>>;
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@ -84,6 +88,15 @@ using iterator_type = char const*;
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using context_type = x3::with_context<keys_tag,
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std::reference_wrapper<keys_map> const,
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x3::phrase_parse_context<space_type>::type>::type;
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using geometry_context_type = x3::with_context<feature_tag,
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std::reference_wrapper<mapnik::feature_impl> const,
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context_type>::type;
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using feature_context_type = x3::with_context<transcoder_tag,
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std::reference_wrapper<mapnik::transcoder> const,
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geometry_context_type>::type;
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}}}
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#endif // MAPNIK_JSON_GRAMMAR_CONFIG_HPP
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231
src/json/extract_bounding_boxes_x3.cpp
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231
src/json/extract_bounding_boxes_x3.cpp
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@ -0,0 +1,231 @@
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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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#include <mapnik/box2d.hpp>
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#include <mapnik/json/extract_bounding_boxes_x3.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 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 base_iterator_type = char const*;
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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<double> bbox;
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calculate_bounding_box<mapnik::box2d<double>> 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<double> > {}
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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<double>>> {}
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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<double> 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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template <typename Iterator, typename Boxes>
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void extract_bounding_boxes(Iterator start, Iterator end, Boxes & boxes)
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{
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using namespace boost::spirit;
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using space_type = mapnik::json::grammar::space_type;
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using iterator_type = Iterator;
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using boxes_type = Boxes;
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extract_positions<iterator_type, boxes_type> callback(start, 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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if (!x3::phrase_parse(start, end, feature_collection_impl, space_type()))
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{
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throw std::runtime_error("Can't extract bounding boxes");
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}
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}
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using box_type = mapnik::box2d<double>;
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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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template void extract_bounding_boxes<base_iterator_type, boxes_type>(base_iterator_type, base_iterator_type, boxes_type&);
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}}
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@ -20,10 +20,12 @@
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*
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*****************************************************************************/
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#if 0
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#include <mapnik/json/geojson_grammar_x3_def.hpp>
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#include <mapnik/json/json_grammar_config.hpp>
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namespace mapnik { namespace json { namespace grammar {
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BOOST_SPIRIT_INSTANTIATE(geojson_grammar_type, iterator_type, context_type);
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}}}
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#endif
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@ -21,10 +21,10 @@
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*****************************************************************************/
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#include <mapnik/json/parse_feature.hpp>
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#include <mapnik/json/json_grammar_config.hpp>
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#include <mapnik/json/generic_json_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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#include <mapnik/json/json_grammar_config.hpp>
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#include <mapnik/json/create_geometry.hpp>
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#include <mapnik/util/conversions.hpp>
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@ -133,9 +133,6 @@ using x3::lit;
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using x3::omit;
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using x3::char_;
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struct transcoder_tag;
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struct feature_tag;
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//
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auto const& value = mapnik::json::generic_json_grammar();
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// import unicode string rule
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auto const& geojson_string = unicode_string_grammar();
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@ -230,7 +227,7 @@ auto const feature_part = x3::rule<struct feature_part_rule_tag> {} =
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omit[geojson_string] > lit(':') > omit[value]
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;
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auto const feature = x3::rule<struct feature_rule_tag> {} =
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auto const feature_rule = x3::rule<struct feature_rule_tag> {} =
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lit('{') > feature_part % lit(',') > lit('}')
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;
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@ -244,7 +241,7 @@ void parse_feature(Iterator start, Iterator end, feature_impl& feature, mapnik::
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using space_type = mapnik::json::grammar::space_type;
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auto grammar = x3::with<mapnik::json::transcoder_tag>(std::ref(tr))
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[x3::with<mapnik::json::feature_tag>(std::ref(feature))
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[ mapnik::json::feature ]];
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[ mapnik::json::feature_rule ]];
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if (!x3::phrase_parse(start, end, grammar, space_type()))
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{
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throw std::runtime_error("Can't parser GeoJSON Feature");
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@ -20,9 +20,11 @@
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*
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*****************************************************************************/
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#if 0
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#include <mapnik/json/positions_grammar_x3_def.hpp>
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#include <mapnik/json/json_grammar_config.hpp>
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namespace mapnik { namespace json { namespace grammar {
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BOOST_SPIRIT_INSTANTIATE(positions_grammar_type, iterator_type, context_type);
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}}}
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#endif
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@ -19,10 +19,12 @@
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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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#if 0
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#include <mapnik/json/unicode_string_grammar_x3_def.hpp>
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#include <mapnik/json/json_grammar_config.hpp>
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namespace mapnik { namespace json { namespace grammar {
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BOOST_SPIRIT_INSTANTIATE(unicode_string_grammar_type, iterator_type, context_type);
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}}}
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#endif
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@ -35,9 +35,11 @@
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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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#include <mapnik/json/geojson_grammar_x3.hpp>
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#include <mapnik/json/unicode_string_grammar_x3.hpp>
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#include <mapnik/json/positions_grammar_x3.hpp>
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#include <mapnik/json/extract_bounding_boxes_x3.hpp>
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namespace {
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@ -211,185 +213,17 @@ bool validate_geojson_feature(mapnik::json::geojson_value & value, Keys const& k
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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 box_type = mapnik::box2d<double>;
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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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{
|
||||
// call our callback
|
||||
x3::get<feature_callback_tag>(ctx)(_attr(ctx));
|
||||
};
|
||||
|
||||
namespace {
|
||||
auto const& geojson_value = geojson_grammar();
|
||||
}
|
||||
|
||||
// extract bounding box from GeoJSON Feature
|
||||
|
||||
struct bracket_tag ;
|
||||
|
||||
auto check_brackets = [](auto const& ctx)
|
||||
{
|
||||
_pass(ctx) = (x3::get<bracket_tag>(ctx) > 0);
|
||||
};
|
||||
|
||||
auto open_bracket = [](auto const& ctx)
|
||||
{
|
||||
++x3::get<bracket_tag>(ctx);
|
||||
};
|
||||
|
||||
auto close_bracket = [](auto const& ctx)
|
||||
{
|
||||
--x3::get<bracket_tag>(ctx);
|
||||
};
|
||||
|
||||
auto assign_range = [](auto const& ctx)
|
||||
{
|
||||
std::get<0>(_val(ctx)) = std::move(_attr(ctx));
|
||||
};
|
||||
|
||||
auto assign_bbox = [](auto const& ctx)
|
||||
{
|
||||
std::get<1>(_val(ctx)) = std::move(_attr(ctx));
|
||||
};
|
||||
|
||||
auto extract_bounding_box = [](auto const& ctx)
|
||||
{
|
||||
mapnik::box2d<float> bbox;
|
||||
calculate_bounding_box<mapnik::box2d<float>> visitor(bbox);
|
||||
mapnik::util::apply_visitor(visitor, _attr(ctx));
|
||||
_val(ctx) = std::move(bbox);
|
||||
};
|
||||
|
||||
auto const coordinates_rule = x3::rule<struct coordinates_rule_tag, mapnik::box2d<float> > {}
|
||||
= lit("\"coordinates\"") >> lit(':') >> positions_rule[extract_bounding_box];
|
||||
|
||||
auto const bounding_box = x3::rule<struct bounding_box_rule_tag, std::tuple<boost::iterator_range<base_iterator_type>,mapnik::box2d<float>>> {}
|
||||
= raw[lit('{')[open_bracket] >> *(eps[check_brackets] >>
|
||||
(lit("\"FeatureCollection\"") > eps(false)
|
||||
|
|
||||
lit('{')[open_bracket]
|
||||
|
|
||||
lit('}')[close_bracket]
|
||||
|
|
||||
coordinates_rule[assign_bbox]
|
||||
|
|
||||
omit[geojson_string]
|
||||
|
|
||||
omit[char_]))][assign_range];
|
||||
|
||||
|
||||
auto const feature = bounding_box[on_feature_callback];
|
||||
|
||||
auto const key_value_ = omit[geojson_string] > lit(':') > omit[geojson_value] ;
|
||||
|
||||
auto const features = lit("\"features\"")
|
||||
> lit(':') > lit('[') > -(omit[feature] % lit(',')) > lit(']');
|
||||
|
||||
auto const type = lit("\"type\"") > lit(':') > lit("\"FeatureCollection\"");
|
||||
|
||||
auto const feature_collection = x3::rule<struct feature_collection_tag> {}
|
||||
= lit('{') > (( type | features | key_value_) % lit(',')) > lit('}');
|
||||
|
||||
|
||||
}}}
|
||||
|
||||
namespace {
|
||||
struct collect_features
|
||||
{
|
||||
collect_features(std::vector<mapnik::json::geojson_value> & values)
|
||||
: values_(values) {}
|
||||
void operator() (mapnik::json::geojson_value && val) const
|
||||
{
|
||||
values_.push_back(std::move(val));
|
||||
}
|
||||
std::vector<mapnik::json::geojson_value> & values_;
|
||||
};
|
||||
|
||||
template <typename Iterator, typename Boxes>
|
||||
struct extract_positions
|
||||
{
|
||||
extract_positions(Iterator start, Boxes & boxes)
|
||||
: start_(start),
|
||||
boxes_(boxes) {}
|
||||
|
||||
template <typename T>
|
||||
void operator() (T const& val) const
|
||||
{
|
||||
auto const& r = std::get<0>(val);
|
||||
mapnik::box2d<float> const& bbox = std::get<1>(val);
|
||||
auto offset = std::distance(start_, r.begin());
|
||||
auto size = std::distance(r.begin(), r.end());
|
||||
boxes_.emplace_back(std::make_pair(bbox,std::make_pair(offset, size)));
|
||||
//boxes_.emplace_back(std::make_tuple(bbox,offset, size));
|
||||
}
|
||||
Iterator start_;
|
||||
Boxes & boxes_;
|
||||
};
|
||||
auto const& geojson_value = mapnik::json::geojson_grammar();
|
||||
|
||||
}
|
||||
|
||||
namespace mapnik { namespace detail {
|
||||
|
||||
|
||||
template <typename T>
|
||||
std::pair<bool,typename T::value_type::first_type> process_geojson_file_x3(T & boxes, std::string const& filename, bool validate_features, bool verbose)
|
||||
{
|
||||
|
|
@ -423,29 +257,12 @@ std::pair<bool,typename T::value_type::first_type> process_geojson_file_x3(T & b
|
|||
base_iterator_type start = file_buffer.c_str();
|
||||
base_iterator_type end = start + file_buffer.length();
|
||||
#endif
|
||||
using namespace boost::spirit;
|
||||
using space_type = mapnik::json::grammar::space_type;
|
||||
auto const* itr = start;
|
||||
|
||||
extract_positions<base_iterator_type, boxes_type> callback(itr, boxes);
|
||||
auto keys = mapnik::json::get_keys();
|
||||
std::size_t bracket_counter = 0;
|
||||
auto feature_collection_impl = x3::with<mapnik::json::grammar::bracket_tag>(std::ref(bracket_counter))
|
||||
[x3::with<mapnik::json::keys_tag>(std::ref(keys))
|
||||
[x3::with<mapnik::json::grammar::feature_callback_tag>(std::ref(callback))
|
||||
[mapnik::json::grammar::feature_collection]
|
||||
]];
|
||||
|
||||
try
|
||||
{
|
||||
bool result = x3::phrase_parse(itr, end, feature_collection_impl, space_type());
|
||||
if (!result)
|
||||
{
|
||||
std::clog << "mapnik-index (GeoJSON) : could not extract bounding boxes from : '" << filename << "'" << std::endl;
|
||||
return std::make_pair(false, extent);
|
||||
}
|
||||
mapnik::json::extract_bounding_boxes(start, end, boxes);
|
||||
}
|
||||
catch (x3::expectation_failure<base_iterator_type> const& ex)
|
||||
catch (boost::spirit::x3::expectation_failure<base_iterator_type> const& ex)
|
||||
{
|
||||
std::clog << ex.what() << std::endl;
|
||||
std::clog << "Expected: " << ex.which();
|
||||
|
|
@ -454,12 +271,16 @@ std::pair<bool,typename T::value_type::first_type> process_geojson_file_x3(T & b
|
|||
}
|
||||
catch (std::exception const& ex)
|
||||
{
|
||||
std::clog << "Exception caught:" << ex.what() << std::endl;
|
||||
std::clog << "mapnik-index (GeoJSON) : could not extract bounding boxes from : '" << filename << "'" << std::endl;
|
||||
return std::make_pair(false, extent);
|
||||
}
|
||||
|
||||
using namespace boost::spirit;
|
||||
using space_type = mapnik::json::grammar::space_type;
|
||||
|
||||
auto keys = mapnik::json::get_keys();
|
||||
auto feature_grammar = x3::with<mapnik::json::keys_tag>(std::ref(keys))
|
||||
[ mapnik::json::grammar::geojson_value ];
|
||||
[ geojson_value ];
|
||||
for (auto const& item : boxes)
|
||||
{
|
||||
if (item.first.valid())
|
||||
|
|
@ -469,6 +290,7 @@ std::pair<bool,typename T::value_type::first_type> process_geojson_file_x3(T & b
|
|||
|
||||
if (validate_features)
|
||||
{
|
||||
#if 0
|
||||
base_iterator_type feat_itr = start + item.second.first;
|
||||
base_iterator_type feat_end = feat_itr + item.second.second;
|
||||
mapnik::json::geojson_value feature_value;
|
||||
|
|
@ -494,6 +316,7 @@ std::pair<bool,typename T::value_type::first_type> process_geojson_file_x3(T & b
|
|||
{
|
||||
return std::make_pair(false, extent);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue