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| <?php | |
| /** | |
| * This file is a part of ChessBrowser. | |
| * | |
| * ChessBrowser is free software: you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation, either version 3 of the License, or | |
| * (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| * | |
| * @file CastlingTracker | |
| * @ingroup ChessBrowser | |
| * @author DannyS712 | |
| */ | |
| namespace MediaWiki\Extension\ChessBrowser; | |
| class CastlingTracker { | |
| /** @var string */ | |
| private $castle; | |
| /** @var int */ | |
| private $castleCode; | |
| private const CODES = [ | |
| 'K' => 8, | |
| 'Q' => 4, | |
| 'k' => 2, | |
| 'q' => 1 | |
| ]; | |
| /** | |
| * @param string $fromFen | |
| */ | |
| public function __construct( string $fromFen ) { | |
| $this->castle = $fromFen ?: '-'; | |
| $this->updateCode(); | |
| } | |
| /** | |
| * Is a castle currently valid (solely based on moved pieces, not the current board) | |
| * | |
| * @param string $option | |
| * @return bool whether this castle is valid | |
| */ | |
| public function checkCastle( string $option ): bool { | |
| $optionCode = self::CODES[$option] ?? 0; | |
| return (bool)( $this->castleCode & $optionCode ); | |
| } | |
| /** | |
| * Set the castleCode | |
| */ | |
| private function updateCode() { | |
| $totalCode = 0; | |
| foreach ( str_split( $this->castle ) as $option ) { | |
| $totalCode += self::CODES[$option] ?? 0; | |
| } | |
| $this->castleCode = $totalCode; | |
| } | |
| /** | |
| * Update the status after a move, and return the new castle status | |
| * | |
| * @param int $movedPiece | |
| * @param int $from | |
| * @return string | |
| */ | |
| public function updateForMove( int $movedPiece, int $from ): string { | |
| $currentCastle = $this->castle; | |
| $newCastle = $currentCastle; | |
| switch ( $movedPiece ) { | |
| case ChessPiece::WHITE_KING: | |
| $newCastle = str_replace( [ 'K', 'Q' ], "", $currentCastle ); | |
| break; | |
| case ChessPiece::BLACK_KING: | |
| $newCastle = str_replace( [ 'k', 'q' ], "", $currentCastle ); | |
| break; | |
| case ChessPiece::WHITE_ROOK: | |
| if ( $from === 0 ) { | |
| $newCastle = str_replace( 'Q', "", $currentCastle ); | |
| } elseif ( $from === 7 ) { | |
| $newCastle = str_replace( 'K', "", $currentCastle ); | |
| } | |
| break; | |
| case ChessPiece::BLACK_ROOK: | |
| if ( $from === 112 ) { | |
| $newCastle = str_replace( 'q', "", $currentCastle ); | |
| } elseif ( $from === 119 ) { | |
| $newCastle = str_replace( 'k', "", $currentCastle ); | |
| } | |
| break; | |
| } | |
| $newCastle = $newCastle ?: '-'; | |
| if ( $newCastle !== $currentCastle ) { | |
| $this->castle = $newCastle; | |
| $this->updateCode(); | |
| } | |
| return $newCastle; | |
| } | |
| } |