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use std::fmt;
type Internal = usize;
#[derive(PartialEq, PartialOrd, Copy, Clone)]
pub struct Side(pub Internal);
const CHARS: [char; 2] = ['w', 'b'];
const NAMES: [&'static str; 2] = ["white", "black"];
impl Side {
pub fn to_char(&self) -> char {
CHARS[self.to_usize()]
}
pub fn to_usize(&self) -> usize {
self.0
}
pub fn raw(&self) -> Internal {
self.0
}
pub fn flip(&self) -> Side {
Side(self.0 ^ 1)
}
pub fn parse(c: char) -> Result<Side, String> {
for (i, _c) in CHARS.iter().enumerate() {
if *_c == c {
return Ok(Side(i));
}
}
Err(format!("Side not recognised: {}", c))
}
pub fn to_str(&self) -> &'static str {
NAMES[self.0]
}
pub fn to_string(&self) -> String {
self.to_str().to_string()
}
}
impl fmt::Display for Side {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.to_char())
}
}
impl fmt::Debug for Side {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.to_char())
}
}
pub const WHITE: Side = Side(0);
pub const BLACK: Side = Side(1);
#[cfg(test)]
mod test {
use super::*;
#[test]
fn char() {
assert_eq!(BLACK.to_char(), 'b');
assert_eq!(WHITE.to_char(), 'w');
}
#[test]
fn flip() {
assert_eq!(BLACK.flip(), WHITE);
assert_eq!(WHITE.flip(), BLACK);
}
}