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use std::ops::Add;
#[derive(Eq, PartialEq, Copy, Clone, Debug)]
pub enum Direction {
Up,
Down,
Left,
Right,
Center,
}
#[derive(Copy, Clone, Eq, PartialEq, Debug, Hash)]
pub(super) struct Coord {
pub(super) x: u8,
pub(super) y: u8,
}
impl Coord {
pub fn in_bounds(self, size: u8) -> bool {
self.x < size && self.y < size
}
}
impl Add<Direction> for Coord {
type Output = Result<Self, &'static str>;
fn add(self, dir: Direction) -> Result<Self, &'static str> {
match dir {
Direction::Up => {
if self.y == 0 {
Err("Already at top row")
} else {
Ok(Coord {
x: self.x,
y: self.y - 1,
})
}
}
Direction::Down => Ok(Coord {
x: self.x,
y: self.y + 1,
}),
Direction::Left => {
if self.x == 0 {
Err("Already at left column")
} else {
Ok(Coord {
x: self.x - 1,
y: self.y,
})
}
}
Direction::Right => Ok(Coord {
x: self.x + 1,
y: self.y,
}),
Direction::Center => Ok(self),
}
}
}