Function BuildStationPart

src/station_cmd.cpp:687–716

* Common part of building various station parts and possibly attaching them to an existing one. * @param[in,out] st Station to attach to * @param flags Command flags * @param reuse Whether to try to reuse a deleted station (gray sign) if possible * @param area Area occupied by the new part * @param name_class Station naming class to use to generate the new station's name * @return Command er

 * @return Command error that occurred, if any
 */
static CommandCost BuildStationPart(Station **st, DoCommandFlags flags, bool reuse, TileArea area, StationNaming name_class)
{
	/* Find a deleted station close to us */
	if (*st == nullptr && reuse) *st = GetClosestDeletedStation(area.tile);

	if (*st != nullptr) {
		if ((*st)->owner != _current_company) {
			return CommandCost(CMD_ERROR);
		}

		CommandCost ret = (*st)->rect.BeforeAddRect(area.tile, area.w, area.h, StationRect::ADD_TEST);
		if (ret.Failed()) return ret;
	} else {
		/* allocate and initialize new station */
		if (!Station::CanAllocateItem()) return CommandCost(STR_ERROR_TOO_MANY_STATIONS_LOADING);

		if (flags.Test(DoCommandFlag::Execute)) {
			*st = new Station(area.tile);
			_station_kdtree.Insert((*st)->index);

			(*st)->town = ClosestTownFromTile(area.tile, UINT_MAX);
			(*st)->string_id = GenerateStationName(*st, area.tile, name_class);

			if (Company::IsValidID(_current_company)) {
				(*st)->town->have_ratings.Set(_current_company);
			}
		}
	}
	return CommandCost();
}

/**
 * This is called right after a station was deleted.