continue_straight option in match

Author: kaligrafy

include/server/api/route_parameters_grammar.hpp

@@ -91,6 +91,9 @@ struct RouteParametersGrammar : public BaseParametersGrammar<Iterator, Signature
                                  qi::_1]) |
             (qi::lit("overview=") >
              overview_type[ph::bind(&engine::api::RouteParameters::overview, qi::_r1) = qi::_1]) |
+            (qi::lit("continue_straight=") >
+              (qi::lit("default") |
+               qi::bool_[ph::bind(&engine::api::RouteParameters::continue_straight, qi::_r1) = qi::_1])) |
             (qi::lit("annotations=") >
              (qi::lit("true")[ph::bind(add_annotation, qi::_r1, AnnotationsType::All)] |
               qi::lit("false")[ph::bind(add_annotation, qi::_r1, AnnotationsType::None)] |

src/engine/plugins/match.cpp

@@ -30,13 +30,13 @@ namespace plugins
 
 // Filters PhantomNodes to obtain a set of viable candiates
 void filterCandidates(const std::vector<util::Coordinate> &coordinates,
-                      MatchPlugin::CandidateLists &candidates_lists)
+                      MatchPlugin::CandidateLists &candidates_lists, const boost::optional<bool> &continue_straight)
 {
     for (const auto current_coordinate : util::irange<std::size_t>(0, coordinates.size()))
     {
         bool allow_uturn = false;
 
-        if (coordinates.size() - 1 > current_coordinate && 0 < current_coordinate)
+        if (!continue_straight && coordinates.size() - 1 > current_coordinate && 0 < current_coordinate)
         {
             double turn_angle =
                 util::coordinate_calculation::computeAngle(coordinates[current_coordinate - 1],
@@ -216,7 +216,7 @@ Status MatchPlugin::HandleRequest(const RoutingAlgorithmsInterface &algorithms,
     auto candidates_lists =
         GetPhantomNodesInRange(facade, tidied.parameters, search_radiuses, true);
 
-    filterCandidates(tidied.parameters.coordinates, candidates_lists);
+    filterCandidates(tidied.parameters.coordinates, candidates_lists, parameters.continue_straight);
     if (std::all_of(candidates_lists.begin(),
                     candidates_lists.end(),
                     [](const std::vector<PhantomNodeWithDistance> &candidates) {