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use color::Color;
#[derive(PartialEq, PartialOrd, Copy, Clone)]
pub struct Square(u8);
pub const NUM_SQUARES: usize = 64;
impl Square {
pub fn new(sq: u8) -> Square {
Square(sq)
}
pub fn make_square(rank: u8, file: u8) -> Square {
Square(rank<<3 | file)
}
pub fn up(&self) -> Option<Square> {
if self.rank() == 7 {
None
} else {
Some(Square::make_square(self.rank() + 1, self.file()))
}
}
pub fn forward(&self, color: Color) -> Option<Square> {
match color {
Color::White => self.up(),
Color::Black => self.down()
}
}
pub fn backward(&self, color: Color) -> Option<Square> {
match color {
Color::White => self.down(),
Color::Black => self.up()
}
}
pub fn down(&self) -> Option<Square> {
if self.rank() == 0 {
None
} else {
Some(Square::make_square(self.rank() - 1, self.file()))
}
}
pub fn left(&self) -> Option<Square> {
if self.file() == 0 {
None
} else {
Some(Square::make_square(self.rank(), self.file() - 1))
}
}
pub fn right(&self) -> Option<Square> {
if self.file() == 7 {
None
} else {
Some(Square::make_square(self.rank(), self.file() + 1))
}
}
pub fn uup(&self) -> Square {
Square::make_square(self.rank() + 1, self.file())
}
pub fn udown(&self) -> Square {
Square::make_square(self.rank() - 1, self.file())
}
pub fn uleft(&self) -> Square {
Square::make_square(self.rank(), self.file() - 1)
}
pub fn uright(&self) -> Square {
Square::make_square(self.rank(), self.file() + 1)
}
pub fn uforward(&self, color: Color) -> Square {
match color {
Color::White => self.uup(),
Color::Black => self.udown()
}
}
pub fn ubackward(&self, color: Color) -> Square {
match color {
Color::White => self.udown(),
Color::Black => self.uup()
}
}
pub fn rank(&self) -> u8 {
self.0 >> 3
}
pub fn file(&self) -> u8 {
self.0 & 7
}
pub fn to_int(&self) -> u8 {
self.0
}
pub fn to_index(&self) -> usize {
self.0 as usize
}
pub fn from_string(s: String) -> Option<Square> {
if s.len() != 2 {
return None;
}
let ch: Vec<char> = s.chars().collect();
match ch[0] {
'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' => {},
_ => { return None; }
}
match ch[1] {
'1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' => {},
_ => { return None; }
}
Some(Square::make_square((ch[1] as u8) - ('1' as u8), (ch[0] as u8) - ('a' as u8)))
}
}
lazy_static! {
pub static ref ALL_SQUARES: Vec<Square> = (0..NUM_SQUARES).map(|i| Square::new(i as u8)).collect();
}