Function buildIntersections

src/engine/guidance/post_processing.cpp:518–570

}

std::vector<RouteStep> buildIntersections(std::vector<RouteStep> steps)
{
    std::size_t last_valid_instruction = 0;
    for (std::size_t step_index = 0; step_index < steps.size(); ++step_index)
    {
        auto &step = steps[step_index];
        const auto instruction = step.maneuver.instruction;
        if (instruction.type == TurnType::Suppressed)
        {
            BOOST_ASSERT(steps[last_valid_instruction].mode == step.mode);
            // count intersections. We cannot use exit, since intersections can follow directly
            // after a roundabout
            steps[last_valid_instruction].ElongateBy(step);
            steps[step_index].Invalidate();
        }
        else if (!isSilent(instruction))
        {

            // End of road is a turn that helps to identify the location of a turn. If the turn does
            // not pass by any other intersections, the end-of-road characteristic does not improve
            // the instructions.
            // Here we reduce the verbosity of our output by reducing end-of-road emissions in cases
            // where no intersections have been passed in between.
            // Since the instruction is located at the beginning of a step, we need to check the
            // previous instruction.
            if (instruction.type == TurnType::EndOfRoad)
            {
                BOOST_ASSERT(step_index > 0);
                const auto &previous_step = steps[last_valid_instruction];
                if (previous_step.intersections.size() < MIN_END_OF_ROAD_INTERSECTIONS)
                {
                    bool same_name =
                        !(step.name.empty() && step.ref.empty()) &&
                        !util::guidance::requiresNameAnnounced(previous_step.name,
                                                               previous_step.ref,
                                                               previous_step.pronunciation,
                                                               previous_step.exits,
                                                               step.name,
                                                               step.ref,
                                                               step.pronunciation,
                                                               step.exits);

                    step.maneuver.instruction.type =
                        same_name ? TurnType::Continue : TurnType::Turn;
                }
            }

            // Remember the last non silent instruction
            last_valid_instruction = step_index;
        }
    }
    return removeNoTurnInstructions(std::move(steps));
}

void applyOverrides(const datafacade::BaseDataFacade &facade,
                    std::vector<RouteStep> &steps,