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: rooms_corridors_bsp.rs
    path of file: ./repos/rustrogueliketutorial/chapter-73-systems/src/map_builders
    
    the code of the file until where you have to start completion: use super::{MetaMapBuilder, BuilderMap, Rect, draw_corridor };

pub struct BspCorridors {}

impl MetaMapBuilder for BspCorridors {
    #[allow(dead_code)]
    fn build_map(&mut self, build_data : &mut BuilderMap) {
        self.corridors(build_data);
    }
}

impl BspCorridors {
    #[allow(dead_code)]
    pub fn new() -> Box<BspCorridors> {
        
    
    fn corridors(&mut self, build_data : &mut BuilderMap) {
        let rooms : Vec<Rect>;
        if let Some(rooms_builder) = &build_data.rooms {
            rooms = rooms_builder.clone();
        } else {
            panic!("BSP Corridors require a builder with room structures");
        }
        let mut corridors : Vec<Vec<usize>> = Vec::new();

        for i in 0..rooms.len()-1 {
            let room = rooms[i];
            let next_room = rooms[i+1];
            let start_x = room.x1 + (crate::rng::roll_dice(1, i32::abs(room.x1 - room.x2))-1);
            let start_y = room.y1 + (crate::rng::roll_dice(1, i32::abs(room.y1 - room.y2))-1);
            let end_x = next_room.x1 + (crate::rng::roll_dice(1, i32::abs(next_room.x1 - next_room.x2))-1);
            let end_y = next_room.y1 + (crate::rng::roll_dice(1, i32::abs(next_room.y1 - next_room.y2))-1);
            let corridor = draw_corridor(&mut build_data.map, start_x, start_y, end_x, end_y);
            corridors.push(corridor);
            build_data.take_snapshot();
        }

        build_data.corridors = Some(corridors);
    }