Method ProcessTurn

src/extractor/scripting_environment_lua.cpp:1255–1327

}

void Sol2ScriptingEnvironment::ProcessTurn(ExtractionTurn &turn)
{
    auto &context = GetSol2Context();

    switch (context.api_version)
    {
    case 4:
    case 3:
    case 2:
        if (context.has_turn_penalty_function)
        {
            auto luares = context.turn_function(context.profile_table, std::ref(turn));
            if (!luares.valid())
                handle_lua_error(luares);

            // Turn weight falls back to the duration value in deciseconds
            // or uses the extracted unit-less weight value
            if (context.properties.fallback_to_duration)
                turn.weight = turn.duration;
            else
                // cap turn weight to max turn weight, which depend on weight precision
                turn.weight = std::min(turn.weight, context.properties.GetMaxTurnWeight());
        }

        break;
    case 1:
        if (context.has_turn_penalty_function)
        {
            auto luares = context.turn_function(std::ref(turn));
            if (!luares.valid())
                handle_lua_error(luares);

            // Turn weight falls back to the duration value in deciseconds
            // or uses the extracted unit-less weight value
            if (context.properties.fallback_to_duration)
                turn.weight = turn.duration;
        }

        break;
    case 0:
        if (context.has_turn_penalty_function)
        {
            if (turn.number_of_roads > 2)
            {
                // Get turn duration and convert deci-seconds to seconds
                turn.duration = static_cast<double>(context.turn_function(turn.angle)) / 10.;
                BOOST_ASSERT(turn.weight == 0);

                // add U-turn penalty
                if (turn.is_u_turn)
                    turn.duration += context.properties.GetUturnPenalty();
            }
            else
            {
                // Use zero turn penalty if it is not an actual turn. This heuristic is necessary
                // since OSRM cannot handle looping roads/parallel roads
                turn.duration = 0.;
            }