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Register a way's .nodes() function for use in the profile's way_function.

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Can be used as in:

    function way_function(way, result)
      for node in way:get_nodes() do
        local id = node:id()
        io.write(">>> " .. id .. "\n")
      end

      -- ...
    end

Warning: we do not use libosmium's location cache, therefore .location()
on the nodes will crash at runtime. Once we switch to using libosmium's
cache this should work. Until then, you can use the node id now.
This commit is contained in:
Daniel J. Hofmann 2016-04-29 17:25:27 +02:00 committed by Patrick Niklaus
parent c7e19396a4
commit 363d2145bd
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GPG Key ID: E426891B5F978B1B
1 changed files with 16 additions and 1 deletions
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17
src/extractor/scripting_environment.cpp
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@ -14,6 +14,7 @@
#include "util/typedefs.hpp"
#include <luabind/tag_function.hpp>
#include <luabind/iterator_policy.hpp>
#include <luabind/operator.hpp>
#include <osmium/osm.hpp>
@ -43,6 +44,11 @@ template <class T> double lonToDouble(T const &object)
return static_cast<double>(util::toFloating(object.lon));
}
// Luabind does not like memr funs: instead of casting to the function's signature (mem fun ptr) we simply wrap it
auto get_nodes_for_way(const osmium::Way& way) -> decltype(way.nodes()) {
return way.nodes();
}
// Error handler
int luaErrorCallback(lua_State *state)
{
@ -134,10 +140,19 @@ void ScriptingEnvironment::InitContext(ScriptingEnvironment::Context &context)
&ExtractionWay::set_forward_mode)
.property("backward_mode", &ExtractionWay::get_backward_mode,
&ExtractionWay::set_backward_mode),
luabind::class_<osmium::WayNodeList>("WayNodeList")
.def(luabind::constructor<>()),
luabind::class_<osmium::NodeRef>("NodeRef")
.def(luabind::constructor<>())
// Dear ambitious reader: registering .location() as in:
// .def("location", +[](const osmium::NodeRef& nref){ return nref.location(); })
// will crash at runtime, since we're not (yet?) using libosnmium's NodeLocationsForWays cache
.def("id", &osmium::NodeRef::ref),
luabind::class_<osmium::Way>("Way")
.def("get_value_by_key", &osmium::Way::get_value_by_key)
.def("get_value_by_key", &get_value_by_key<osmium::Way>)
.def("id", &osmium::Way::id),
.def("id", &osmium::Way::id)
.def("get_nodes", get_nodes_for_way, luabind::return_stl_iterator),
luabind::class_<InternalExtractorEdge>("EdgeSource")
.def_readonly("source_coordinate", &InternalExtractorEdge::source_coordinate)
.def_readwrite("weight_data", &InternalExtractorEdge::weight_data),