Trip with Fixed Start and End points (TFSE) (#3408)

* fixed start and end trip feature to trip service

include/server/api/trip_parameter_grammar.hpp

@@ -4,6 +4,7 @@
 #include "server/api/route_parameters_grammar.hpp"
 #include "engine/api/trip_parameters.hpp"
 
+#include <boost/spirit/include/phoenix.hpp>
 #include <boost/spirit/include/qi.hpp>
 
 namespace osrm
@@ -15,6 +16,7 @@ namespace api
 
 namespace
 {
+namespace ph = boost::phoenix;
 namespace qi = boost::spirit::qi;
 }
 
@@ -26,12 +28,37 @@ struct TripParametersGrammar final : public RouteParametersGrammar<Iterator, Sig
 
     TripParametersGrammar() : BaseGrammar(root_rule)
     {
+        roundtrip_rule =
+            qi::lit("roundtrip=") >
+            qi::bool_[ph::bind(&engine::api::TripParameters::roundtrip, qi::_r1) = qi::_1];
+
+        source_type.add("any", engine::api::TripParameters::SourceType::Any)(
+            "first", engine::api::TripParameters::SourceType::First);
+
+        destination_type.add("any", engine::api::TripParameters::DestinationType::Any)(
+            "last", engine::api::TripParameters::DestinationType::Last);
+
+        source_rule = qi::lit("source=") >
+                      source_type[ph::bind(&engine::api::TripParameters::source, qi::_r1) = qi::_1];
+
+        destination_rule =
+            qi::lit("destination=") >
+            destination_type[ph::bind(&engine::api::TripParameters::destination, qi::_r1) = qi::_1];
+
         root_rule = BaseGrammar::query_rule(qi::_r1) > -qi::lit(".json") >
-                    -('?' > (BaseGrammar::base_rule(qi::_r1)) % '&');
+                    -('?' > (roundtrip_rule(qi::_r1) | source_rule(qi::_r1) |
+                             destination_rule(qi::_r1) | BaseGrammar::base_rule(qi::_r1)) %
+                                '&');
     }
 
   private:
+    qi::rule<Iterator, Signature> source_rule;
+    qi::rule<Iterator, Signature> destination_rule;
+    qi::rule<Iterator, Signature> roundtrip_rule;
     qi::rule<Iterator, Signature> root_rule;
+
+    qi::symbols<char, engine::api::TripParameters::SourceType> source_type;
+    qi::symbols<char, engine::api::TripParameters::DestinationType> destination_type;
 };
 }
 }