basic turn lane handling

include/util/guidance/toolkit.hpp

@@ -65,6 +65,42 @@ mirrorDirectionModifier(const extractor::guidance::DirectionModifier::Enum modif
     return results[modifier];
 }
 
+inline bool hasLeftModifier(const extractor::guidance::TurnInstruction instruction)
+{
+    return instruction.direction_modifier == extractor::guidance::DirectionModifier::SharpLeft ||
+           instruction.direction_modifier == extractor::guidance::DirectionModifier::Left ||
+           instruction.direction_modifier == extractor::guidance::DirectionModifier::SlightLeft;
+}
+
+inline bool hasRightModifier(const extractor::guidance::TurnInstruction instruction)
+{
+    return instruction.direction_modifier == extractor::guidance::DirectionModifier::SharpRight ||
+           instruction.direction_modifier == extractor::guidance::DirectionModifier::Right ||
+           instruction.direction_modifier == extractor::guidance::DirectionModifier::SlightRight;
+}
+
+inline bool isLeftTurn(const extractor::guidance::TurnInstruction instruction)
+{
+    switch (instruction.type)
+    {
+    case extractor::guidance::TurnType::Merge:
+        return hasRightModifier(instruction);
+    default:
+        return hasLeftModifier(instruction);
+    }
+}
+
+inline bool isRightTurn(const extractor::guidance::TurnInstruction instruction)
+{
+    switch (instruction.type)
+    {
+    case extractor::guidance::TurnType::Merge:
+        return hasLeftModifier(instruction);
+    default:
+        return hasRightModifier(instruction);
+    }
+}
+
 } // namespace guidance
 } // namespace util
 } // namespace osrm

include/util/guidance/turn_lanes.hpp

@@ -0,0 +1,85 @@
+#ifndef OSRM_UTIL_GUIDANCE_TURN_LANES_HPP
+#define OSRM_UTIL_GUIDANCE_TURN_LANES_HPP
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <vector>
+
+#include "util/typedefs.hpp"
+
+#include <boost/functional/hash.hpp>
+
+namespace osrm
+{
+namespace util
+{
+namespace guidance
+{
+class LaneTupel;
+} // namespace guidance
+} // namespace util
+} // namespace osrm
+
+namespace std
+{
+template <> struct hash<::osrm::util::guidance::LaneTupel>
+{
+    inline std::size_t operator()(const ::osrm::util::guidance::LaneTupel &bearing_class) const;
+};
+} // namespace std
+
+namespace osrm
+{
+namespace util
+{
+namespace guidance
+{
+
+// The mapping of turn lanes can be done two values. We describe every turn by the number of
+// contributing lanes and the first lane from the right..
+// Given a road like this:
+//           |   |   |
+//           |   |   |
+// -----------       |
+//      -^           |
+// -----------        -------------
+//      -^ ->
+// --------------------------------
+//      -v       |
+// ----------    |
+//          |    |
+//
+// we generate a set of tuples in the form of:
+// (2,1), (1,1), (1,0) for left, through and right respectively
+class LaneTupel
+{
+  public:
+    LaneTupel();
+    LaneTupel(const LaneID lanes_in_turn, const LaneID first_lane_from_the_right);
+
+    bool operator==(const LaneTupel other) const;
+    bool operator!=(const LaneTupel other) const;
+    bool operator<(const LaneTupel other) const;
+
+    LaneID lanes_in_turn;
+    LaneID first_lane_from_the_right;
+
+    friend std::size_t std::hash<LaneTupel>::operator()(const LaneTupel &) const;
+};
+
+} // namespace guidance
+} // namespace util
+} // namespace osrm
+
+// make Bearing Class hasbable
+namespace std
+{
+inline size_t hash<::osrm::util::guidance::LaneTupel>::
+operator()(const ::osrm::util::guidance::LaneTupel &lane_tupel) const
+{
+    return boost::hash_value(*reinterpret_cast<const std::uint16_t *>(&lane_tupel));
+}
+} // namespace std
+
+#endif /* OSRM_UTIL_GUIDANCE_TURN_LANES_HPP */