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<?php
class ChessMove {
const PIECE_LETTERS = array(
ChessPiece::PAWN => 'p',
ChessPiece::KNIGHT => 'n',
ChessPiece::BISHOP => 'b',
ChessPiece::ROOK => 'r',
ChessPiece::QUEEN => 'q',
ChessPiece::KING => 'k'
);
public $starting_square;
public $ending_square;
public $color;
public $piece_type;
public $capture;
public $check = FALSE;
public $checkmate = FALSE;
public $promotion_piece_type = NULL; // Use the setter to change this. Keeping public so it can be read publicly.
public $en_passant = FALSE;
public $disambiguation = '';
public $castling = FALSE;
public $board;
function __construct(
ChessSquare $starting_square,
ChessSquare $ending_square,
$color,
$piece_type,
bool $capture,
ChessBoard $old_board,
bool $store_board = TRUE
) {
$this->starting_square = $starting_square;
$this->ending_square = $ending_square;
$this->color = $color;
$this->piece_type = $piece_type;
$this->capture = $capture;
// Adding $store_board sped up the code by 300ms
if ( $store_board ) {
$this->board = clone $old_board;
// Perft uses an empty move to store a board. If not empty move, modify the board.
if ( $this->starting_square ) {
$this->board->make_move($starting_square, $ending_square);
$this->possibly_remove_our_castling_privileges();
$this->possibly_remove_enemy_castling_privileges();
$this->if_castling_move_rook();
}
}
}
function possibly_remove_our_castling_privileges(): void {
// if our king or rook moves update the FEN to take away our castling privileges
if ( $this->color == ChessPiece::BLACK ) {
if ( $this->piece_type == ChessPiece::KING && $this->starting_square->get_alphanumeric() == 'e8' ) {
$this->board->castling['black_can_castle_kingside'] = FALSE;
$this->board->castling['black_can_castle_queenside'] = FALSE;
} elseif ( $this->piece_type == ChessPiece::ROOK && $this->starting_square->get_alphanumeric() == 'a8' ) {
$this->board->castling['black_can_castle_queenside'] = FALSE;
} elseif ( $this->piece_type == ChessPiece::ROOK && $this->starting_square->get_alphanumeric() == 'h8' ) {
$this->board->castling['black_can_castle_kingside'] = FALSE;
}
} elseif ( $this->color == ChessPiece::WHITE ) {
if ( $this->piece_type == ChessPiece::KING && $this->starting_square->get_alphanumeric() == 'e1' ) {
$this->board->castling['white_can_castle_kingside'] = FALSE;
$this->board->castling['white_can_castle_queenside'] = FALSE;
} elseif ( $this->piece_type == ChessPiece::ROOK && $this->starting_square->get_alphanumeric() == 'a1' ) {
$this->board->castling['white_can_castle_queenside'] = FALSE;
} elseif ( $this->piece_type == ChessPiece::ROOK && $this->starting_square->get_alphanumeric() == 'h1' ) {
$this->board->castling['white_can_castle_kingside'] = FALSE;
}
}
}
function possibly_remove_enemy_castling_privileges(): void {
// If an enemy rook is captured, update the FEN to take away enemy castling privileges.
// We'll keep it simple. Anytime a piece moves into a corner square (a1, a8, h1, h8),
// remove the other side's castling privileges.
if ( $this->color == ChessPiece::BLACK ) {
if ( $this->ending_square->get_alphanumeric() == 'a1' ) {
$this->board->castling['white_can_castle_queenside'] = FALSE;
} elseif ( $this->ending_square->get_alphanumeric() == 'h1' ) {
$this->board->castling['white_can_castle_kingside'] = FALSE;
}
} elseif ( $this->color == ChessPiece::WHITE ) {
if ( $this->ending_square->get_alphanumeric() == 'a8' ) {
$this->board->castling['black_can_castle_queenside'] = FALSE;
} elseif ( $this->ending_square->get_alphanumeric() == 'h8' ) {
$this->board->castling['black_can_castle_kingside'] = FALSE;
}
}
}
function if_castling_move_rook(): void {
// if castling, move the rook into the right place
if ( $this->color == ChessPiece::BLACK ) {
if (
$this->piece_type == ChessPiece::KING &&
$this->starting_square->get_alphanumeric() == 'e8' &&
$this->ending_square->get_alphanumeric() == 'g8'
) {
$starting_square = new ChessSquare('h8');
$ending_square = new ChessSquare('f8');
$this->board->make_additional_move_on_same_turn($starting_square, $ending_square);
$this->castling = TRUE;
} elseif (
$this->piece_type == ChessPiece::KING &&
$this->starting_square->get_alphanumeric() == 'e8' &&
$this->ending_square->get_alphanumeric() == 'c8'
) {
$starting_square = new ChessSquare('a8');
$ending_square = new ChessSquare('d8');
$this->board->make_additional_move_on_same_turn($starting_square, $ending_square);
$this->castling = TRUE;
}
} elseif ( $this->color == ChessPiece::WHITE ) {
if (
$this->piece_type == ChessPiece::KING &&
$this->starting_square->get_alphanumeric() == 'e1' &&
$this->ending_square->get_alphanumeric() == 'g1'
) {
$starting_square = new ChessSquare('h1');
$ending_square = new ChessSquare('f1');
$this->board->make_additional_move_on_same_turn($starting_square, $ending_square);
$this->castling = TRUE;
} elseif (
$this->piece_type == ChessPiece::KING &&
$this->starting_square->get_alphanumeric() == 'e1' &&
$this->ending_square->get_alphanumeric() == 'c1'
) {
$starting_square = new ChessSquare('a1');
$ending_square = new ChessSquare('d1');
$this->board->make_additional_move_on_same_turn($starting_square, $ending_square);
$this->castling = TRUE;
}
}
}
// Do a deep clone. Needed for pawn promotion.
function __clone() {
$this->starting_square = clone $this->starting_square;
$this->ending_square = clone $this->ending_square;
if ( $this->board ) {
$this->board = clone $this->board;
}
}
function set_promotion_piece($piece_type): void {
// update the piece
$rank = $this->ending_square->rank;
$file = $this->ending_square->file;
if ( $this->board ) {
$this->board->board[$rank][$file]->type = $piece_type;
}
// update the notation
$this->promotion_piece_type = $piece_type;
}
function get_notation(): string {
$string = '';
if (
$this->starting_square->get_alphanumeric() == 'e8' &&
$this->ending_square->get_alphanumeric() == 'g8' &&
$this->piece_type == ChessPiece::KING &&
$this->color == ChessPiece::BLACK
) {
$string .= 'O-O';
} elseif (
$this->starting_square->get_alphanumeric() == 'e1' &&
$this->ending_square->get_alphanumeric() == 'g1' &&
$this->piece_type == ChessPiece::KING &&
$this->color == ChessPiece::WHITE
) {
$string .= 'O-O';
} elseif (
$this->starting_square->get_alphanumeric() == 'e8' &&
$this->ending_square->get_alphanumeric() == 'c8' &&
$this->piece_type == ChessPiece::KING &&
$this->color == ChessPiece::BLACK
) {
$string .= 'O-O-O';
} elseif (
$this->starting_square->get_alphanumeric() == 'e1' &&
$this->ending_square->get_alphanumeric() == 'c1' &&
$this->piece_type == ChessPiece::KING &&
$this->color == ChessPiece::WHITE
) {
$string .= 'O-O-O';
} else {
// type of piece
if ( $this->piece_type == ChessPiece::PAWN && $this->capture ) {
$string .= substr($this->starting_square->get_alphanumeric(), 0, 1);
} elseif ( $this->piece_type != ChessPiece::PAWN ) {
$string .= strtoupper(self::PIECE_LETTERS[$this->piece_type]);
}
// disambiguation of rank/file/square
$string .= $this->disambiguation;
// capture?
if ( $this->capture ) {
$string .= 'x';
}
// destination square
$string .= $this->ending_square->get_alphanumeric();
// en passant
if ( $this->en_passant ) {
$string .= 'e.p.';
}
// pawn promotion
if ( $this->promotion_piece_type == ChessPiece::QUEEN ) {
$string .= '=Q';
} elseif ( $this->promotion_piece_type == ChessPiece::ROOK ) {
$string .= '=R';
} elseif ( $this->promotion_piece_type == ChessPiece::BISHOP ) {
$string .= '=B';
} elseif ( $this->promotion_piece_type == ChessPiece::KNIGHT ) {
$string .= '=N';
}
}
// check or checkmate
if ( $this->checkmate ) {
$string .= '#';
} elseif ( $this->check ) {
$string .= '+';
}
return $string;
}
function get_coordinate_notation(): string {
// Automatically pick queen when drag and dropping.
if (
$this->promotion_piece_type == ChessPiece::ROOK ||
$this->promotion_piece_type == ChessPiece::BISHOP ||
$this->promotion_piece_type == ChessPiece::KNIGHT
) {
return "";
} else {
return $this->starting_square->get_alphanumeric() . $this->ending_square->get_alphanumeric();
}
}
function get_piece_letter(): string {
return strtoupper(self::PIECE_LETTERS[$this->piece_type]);
}
}
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