#[derive(Debug, Eq, PartialEq)]
pub struct Position {
    pub x: u8,
    pub y: u8,
}

impl From<String> for Position {
    fn from(string: String) -> Position {
        // e.g. "2,5"
        let xy: Vec<&str> = string.split(',').collect();
        let x = xy[0].parse().unwrap();

        if xy.len() < 2 {
            panic!("Bad position : {}", string);
        }

        let y = xy[1].parse().unwrap();

        Position { x, y }
    }
}

impl ToString for Position {
    #[inline]
    fn to_string(&self) -> String {
        format!("{},{}", self.x, self.y)
    }
}

#[test]
fn test_position_from_string() {
    assert_eq!(Position::from("4,12".to_string()), Position { x: 4, y: 12 });
}

#[test]
fn test_position_to_string() {
    assert_eq!(Position { x: 4, y: 12 }.to_string(), "4,12".to_string())
}