snake/
coord.rs

1use std::ops::Add;
2
3/// Choice for direction on board
4#[derive(Eq, PartialEq, Copy, Clone, Debug)]
5pub enum Direction {
6    Up,
7    Down,
8    Left,
9    Right,
10    Center,
11}
12
13/// Coordinate to show position on board
14#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
15pub(super) struct Coord {
16    pub(super) x: u8,
17    pub(super) y: u8,
18}
19
20impl Coord {
21    pub fn in_bounds(self, size: u8) -> bool {
22        self.x < size && self.y < size
23    }
24}
25
26impl Add<Direction> for Coord {
27    type Output = Result<Self, &'static str>;
28
29    fn add(self, dir: Direction) -> Result<Self, &'static str> {
30        match dir {
31            Direction::Up => {
32                if self.y == 0 {
33                    Err("Already at top row")
34                } else {
35                    Ok(Coord {
36                        x: self.x,
37                        y: self.y - 1,
38                    })
39                }
40            }
41            Direction::Down => Ok(Coord {
42                x: self.x,
43                y: self.y + 1,
44            }),
45            Direction::Left => {
46                if self.x == 0 {
47                    Err("Already at left column")
48                } else {
49                    Ok(Coord {
50                        x: self.x - 1,
51                        y: self.y,
52                    })
53                }
54            }
55            Direction::Right => Ok(Coord {
56                x: self.x + 1,
57                y: self.y,
58            }),
59            Direction::Center => Ok(self),
60        }
61    }
62}
snake/coord.rs

snake/
coord.rs
