basic TopoJSON parsing tests (work-in-progress)

test/unit/datasource/topojson.cpp

@@ -0,0 +1,68 @@
+/*****************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+#include "catch.hpp"
+
+#include <mapnik/util/fs.hpp>
+#include <mapnik/util/file_io.hpp>
+#include <mapnik/json/topology.hpp>
+#include <mapnik/json/topojson_grammar.hpp>
+#include <mapnik/json/topojson_utils.hpp>
+
+namespace {
+
+using iterator_type = std::string::const_iterator;
+const mapnik::topojson::topojson_grammar<iterator_type> grammar;
+
+bool parse_topology(std::string const& filename, mapnik::topojson::topology & topo)
+{
+    mapnik::util::file file(filename);
+    std::string buffer;
+    buffer.resize(file.size());
+    std::fread(&buffer[0], buffer.size(), 1, file.get());
+    if (!file) return false;
+    boost::spirit::standard::space_type space;
+    iterator_type itr = buffer.begin();
+    iterator_type end = buffer.end();
+    bool result = boost::spirit::qi::phrase_parse(itr, end, grammar, space, topo);
+    return (result && (itr == end));
+}
+
+
+}
+
+TEST_CASE("topology")
+{
+    SECTION("geometry parsing")
+    {
+        for (auto const& path : mapnik::util::list_directory("test/data/topojson/"))
+        {
+            mapnik::topojson::topology topo;
+            REQUIRE(parse_topology(path, topo));
+            for (auto const& geom : topo.geometries)
+            {
+                mapnik::box2d<double> box = mapnik::util::apply_visitor(mapnik::topojson::bounding_box_visitor(topo), geom);
+                //std::cerr << box << std::endl;
+            }
+        }
+    }
+}