add extract_bounding_boxes_x3 parser configuration

include/mapnik/json/extract_bounding_boxes_x3_config.hpp

@@ -0,0 +1,92 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2016 Artem Pavlenko
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_JSON_EXTRACT_BOUNDING_BOXES_CONFIG_HPP
+#define MAPNIK_JSON_EXTRACT_BOUNDING_BOXES_CONFIG_HPP
+
+#include <mapnik/json/json_grammar_config.hpp>
+#include <mapnik/box2d.hpp>
+
+#pragma GCC diagnostic push
+#include <mapnik/warning_ignore.hpp>
+#include <boost/spirit/home/x3.hpp>
+#pragma GCC diagnostic pop
+
+//auto feature_collection_impl = x3::with<mapnik::json::grammar::bracket_tag>(std::ref(bracket_counter))
+// [x3::with<mapnik::json::grammar::keys_tag>(std::ref(keys))
+//       [x3::with<mapnik::json::grammar::feature_callback_tag>(std::ref(callback))
+//        [mapnik::json::grammar::feature_collection]
+//           ]];
+
+namespace mapnik { namespace json {
+
+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_;
+};
+
+using box_type = mapnik::box2d<float>;
+using boxes_type = std::vector<std::pair<box_type, std::pair<std::size_t, std::size_t>>>;
+using callback_type = extract_positions<grammar::iterator_type, boxes_type>;
+
+namespace grammar {
+
+struct bracket_tag;
+struct feature_callback_tag;
+
+namespace x3 = boost::spirit::x3;
+using space_type = x3::standard::space_type;
+//using iterator_type = char const*;
+
+using phrase_parse_context_type = x3::phrase_parse_context<space_type>::type;
+
+using context_type = x3::with_context<keys_tag,
+                                      std::reference_wrapper<keys_map> const,
+                                      phrase_parse_context_type>::type;
+
+using extract_bounding_boxes_context_type =
+    x3::with_context<bracket_tag,
+                     std::reference_wrapper<std::size_t> const,
+                     x3::with_context<feature_callback_tag,
+                                      std::reference_wrapper<callback_type> const,
+                                      context_type>::type>::type;
+
+
+}}}
+
+#endif // MAPNIK_JSON_EXTRACT_BOUNDING_BOXES_CONFIG_HPP