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use crate::bitboard::BitBoard;
use crate::pieces::Piece;
use crate::square::Square;
use crate::Side;
use anyhow::anyhow;
use std::fmt::{Display, Formatter};
use std::str::FromStr;
use enumset::*;
#[derive(Debug, EnumSetType, PartialOrd, Ord, Hash)]
#[rustfmt::skip]
pub enum CastleZone { WK, WQ, BK, BQ }
impl Display for CastleZone {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", format!("{:?}", self).to_lowercase())
}
}
impl FromStr for CastleZone {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"wk" | "WK" => Ok(CastleZone::WK),
"wq" | "WQ" => Ok(CastleZone::WQ),
"bk" | "BK" => Ok(CastleZone::BK),
"bq" | "BQ" => Ok(CastleZone::BQ),
_ => Err(anyhow!("Cannot parse {} as CastleZone", s)),
}
}
}
impl CastleZone {
pub fn side(&self) -> Side {
match self {
CastleZone::WK | CastleZone::WQ => Side::White,
CastleZone::BK | CastleZone::BQ => Side::Black,
}
}
pub fn kingside(side: Side) -> CastleZone {
match side {
Side::White => CastleZone::WK,
Side::Black => CastleZone::BK,
}
}
pub fn queenside(side: Side) -> CastleZone {
match side {
Side::White => CastleZone::WQ,
Side::Black => CastleZone::BQ,
}
}
pub fn iter() -> impl Iterator<Item = CastleZone> {
[
CastleZone::WK,
CastleZone::WQ,
CastleZone::BK,
CastleZone::BQ,
]
.iter()
.cloned()
}
pub fn source_squares(self) -> BitBoard {
match self {
CastleZone::WK => Square::E1 | Square::H1,
CastleZone::WQ => Square::E1 | Square::A1,
CastleZone::BK => Square::E8 | Square::H8,
CastleZone::BQ => Square::E8 | Square::A8,
}
}
pub fn rook_data(self) -> (Piece, Square, Square) {
match self {
CastleZone::WK => (Piece::WR, Square::H1, Square::F1),
CastleZone::BK => (Piece::BR, Square::H8, Square::F8),
CastleZone::WQ => (Piece::WR, Square::A1, Square::D1),
CastleZone::BQ => (Piece::BR, Square::A8, Square::D8),
}
}
pub fn king_data(self) -> (Piece, Square, Square) {
match self {
CastleZone::WK => (Piece::WK, Square::E1, Square::G1),
CastleZone::BK => (Piece::BK, Square::E8, Square::G8),
CastleZone::WQ => (Piece::WK, Square::E1, Square::C1),
CastleZone::BQ => (Piece::BK, Square::E8, Square::C8),
}
}
pub fn unoccupied_requirement(self) -> BitBoard {
match self {
CastleZone::WK => Square::F1 | Square::G1,
CastleZone::WQ => Square::B1 | Square::C1 | Square::D1,
CastleZone::BK => Square::F8 | Square::G8,
CastleZone::BQ => Square::B8 | Square::C8 | Square::D8,
}
}
pub fn uncontrolled_requirement(self) -> BitBoard {
match self {
CastleZone::WK => Square::E1 | Square::F1 | Square::G1,
CastleZone::WQ => Square::E1 | Square::C1 | Square::D1,
CastleZone::BK => Square::E8 | Square::F8 | Square::G8,
CastleZone::BQ => Square::E8 | Square::C8 | Square::D8,
}
}
pub fn lift(self) -> EnumSet<CastleZone> {
enum_set!(self)
}
}
#[cfg(test)]
mod test {
use crate::CastleZone;
#[test]
fn display() {
assert_eq!("wk", CastleZone::WK.to_string().as_str());
assert_eq!("wq", CastleZone::WQ.to_string().as_str());
assert_eq!("bk", CastleZone::BK.to_string().as_str());
assert_eq!("bq", CastleZone::BQ.to_string().as_str());
}
#[test]
fn from_str() {
assert_eq!(CastleZone::WK, "wk".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::WK, "WK".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::WQ, "wq".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::WQ, "WQ".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::BK, "bk".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::BK, "BK".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::BQ, "bq".parse::<CastleZone>().unwrap());
assert_eq!(CastleZone::BQ, "BQ".parse::<CastleZone>().unwrap());
}
}