You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/rustrogueliketutorial/chapter-26-bsp-interiors/src/map_builders
    
    the code of the file until where you have to start completion: use super::{Map, Rect, TileType, Position, spawner, SHOW_MAPGEN_VISUALIZER};
mod simple_map;
use simple_map::SimpleMapBuilder;
mod bsp_dungeon;
use bsp_dungeon::BspDungeonBuilder;
mod bsp_interior;
use bsp_interior::BspInteriorBuilder
    
pub fn random_builder(new_depth: i32) -> Box<dyn MapBuilder> {
    let mut rng = rltk::RandomNumberGenerator::new();
    let builder = rng.roll_dice(1, 3);
    match builder {
        1 => Box::new(BspDungeonBuilder::new(new_depth)),
        2 => Box::new(BspInteriorBuilder::new(new_depth)),
        _ => Box::new(SimpleMapBuilder::new(new_depth))
    }
}