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| 1 | <?php |
| 2 | /** |
| 3 | * This file is a part of ChessBrowser. |
| 4 | * |
| 5 | * ChessBrowser is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | * This file is a part of PgnParser |
| 19 | * |
| 20 | * PgnParser is free software: you can redistribute it and/or modify |
| 21 | * it under the terms of the GNU Lesser General Public License as published by |
| 22 | * the Free Software Foundation, either version 3 of the License, or |
| 23 | * (at your option) any later version. |
| 24 | * |
| 25 | * This program is distributed in the hope that it will be useful, |
| 26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 28 | * GNU Lesser General Public License for more details. |
| 29 | * |
| 30 | * You should have received a copy of the GNU Lesser General Public License |
| 31 | * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| 32 | * |
| 33 | * @file FenParser0x88 |
| 34 | * @ingroup ChessBrowser |
| 35 | * @author Alf Magne Kalleland |
| 36 | */ |
| 37 | |
| 38 | namespace MediaWiki\Extension\ChessBrowser\PgnParser; |
| 39 | |
| 40 | use MediaWiki\Extension\ChessBrowser\CastlingTracker; |
| 41 | use MediaWiki\Extension\ChessBrowser\ChessBrowserException; |
| 42 | use MediaWiki\Extension\ChessBrowser\ChessPiece; |
| 43 | use MediaWiki\Extension\ChessBrowser\ChessSquare; |
| 44 | use MediaWiki\Extension\ChessBrowser\NotationAnalyzer; |
| 45 | use MediaWiki\Extension\ChessBrowser\SquareRelations; |
| 46 | |
| 47 | class FenParser0x88 { |
| 48 | /** @var string|null */ |
| 49 | private $fen; |
| 50 | /** @var array */ |
| 51 | private $cache; |
| 52 | |
| 53 | /** @var string|null */ |
| 54 | private $notation; |
| 55 | /** @var array|null */ |
| 56 | private $validMoves = null; |
| 57 | /** @var array */ |
| 58 | private $fenParts = []; |
| 59 | /** @var array */ |
| 60 | private $keySquares; |
| 61 | /** @var CastlingTracker|null */ |
| 62 | private $castlingTracker; |
| 63 | |
| 64 | private const FEN_SQUARES = [ |
| 65 | 'a8', 'b8', 'c8', 'd8', 'e8', 'f8', 'g8', 'h8', |
| 66 | 'a7', 'b7', 'c7', 'd7', 'e7', 'f7', 'g7', 'h7', |
| 67 | 'a6', 'b6', 'c6', 'd6', 'e6', 'f6', 'g6', 'h6', |
| 68 | 'a5', 'b5', 'c5', 'd5', 'e5', 'f5', 'g5', 'h5', |
| 69 | 'a4', 'b4', 'c4', 'd4', 'e4', 'f4', 'g4', 'h4', |
| 70 | 'a3', 'b3', 'c3', 'd3', 'e3', 'f3', 'g3', 'h3', |
| 71 | 'a2', 'b2', 'c2', 'd2', 'e2', 'f2', 'g2', 'h2', |
| 72 | 'a1', 'b1', 'c1', 'd1', 'e1', 'f1', 'g1', 'h1' |
| 73 | ]; |
| 74 | |
| 75 | private const VALID_NUMBERS = [ |
| 76 | '0' => 1, |
| 77 | '1' => 1, |
| 78 | '2' => 1, |
| 79 | '3' => 1, |
| 80 | '4' => 1, |
| 81 | '5' => 1, |
| 82 | '6' => 1, |
| 83 | '7' => 1, |
| 84 | '8' => 1, |
| 85 | '9' => 0 |
| 86 | ]; |
| 87 | |
| 88 | /** |
| 89 | * Create a new FenParser |
| 90 | * |
| 91 | * @param string $fen |
| 92 | */ |
| 93 | public function __construct( string $fen ) { |
| 94 | // Set up $keySquares |
| 95 | $keySquares = []; |
| 96 | foreach ( range( 0, 119 ) as $square ) { |
| 97 | $keySquares[] = ",$square,"; |
| 98 | } |
| 99 | $this->keySquares = $keySquares; |
| 100 | |
| 101 | $this->setFen( $fen ); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Set new fen position |
| 106 | * Example: |
| 107 | * $parser = new FenParser0x88(); |
| 108 | * $parser->setFen('8/7P/8/8/1k15/8/P7/K7 w - - 0 1'); |
| 109 | * |
| 110 | * @param string $fen |
| 111 | */ |
| 112 | public function setFen( $fen ) { |
| 113 | $this->cache = [ |
| 114 | // Create the default board as empty |
| 115 | 'board' => array_fill( 0, 120, 0 ), |
| 116 | 'white' => [], |
| 117 | 'black' => [], |
| 118 | 'whiteSliding' => [], |
| 119 | 'blackSliding' => [], |
| 120 | 'king' => [ 'white' => null, 'black' => null ] |
| 121 | ]; |
| 122 | |
| 123 | $this->fen = $fen; |
| 124 | |
| 125 | $fenParts = explode( " ", $fen ); |
| 126 | |
| 127 | $this->castlingTracker = new CastlingTracker( $fenParts[2] ); |
| 128 | |
| 129 | $this->fenParts = [ |
| 130 | 'color' => $fenParts[1], |
| 131 | 'castle' => $fenParts[2], |
| 132 | 'enPassant' => $fenParts[3], |
| 133 | 'halfMoves' => $fenParts[4], |
| 134 | 'fullMoves' => $fenParts[5] |
| 135 | ]; |
| 136 | |
| 137 | // Pieces |
| 138 | $this->parseFen( $fenParts[0] ); |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * Parse the stored fenParts |
| 143 | * |
| 144 | * @param string $pieceStr |
| 145 | */ |
| 146 | private function parseFen( string $pieceStr ) { |
| 147 | $pos = 0; |
| 148 | $squares = self::FEN_SQUARES; |
| 149 | $pieces = str_split( $pieceStr ); |
| 150 | $length = count( $pieces ); |
| 151 | foreach ( range( 0, $length - 1 ) as $index ) { |
| 152 | // Need to use index to be able to check position |
| 153 | $token = $pieces[$index]; |
| 154 | |
| 155 | try { |
| 156 | $pieceObject = new ChessPiece( $token ); |
| 157 | } catch ( ChessBrowserException $ex ) { |
| 158 | $pieceObject = false; |
| 159 | } |
| 160 | |
| 161 | if ( $pieceObject !== false ) { |
| 162 | $square = ChessSquare::newFromCoords( $squares[$pos] )->getNumber(); |
| 163 | $type = $pieceObject->getAsHex(); |
| 164 | $piece = [ |
| 165 | 't' => $type, |
| 166 | 's' => $square |
| 167 | ]; |
| 168 | // Board array |
| 169 | $this->cache['board'][$square] = $type; |
| 170 | |
| 171 | $color = $pieceObject->getColor(); |
| 172 | $this->cache[$color][] = $piece; |
| 173 | |
| 174 | // King array |
| 175 | if ( $pieceObject->getType() === 'k' ) { |
| 176 | $this->cache['king' . $color] = $piece; |
| 177 | } |
| 178 | $pos++; |
| 179 | } elseif ( $index < $length - 1 && isset( self::VALID_NUMBERS[$token] ) ) { |
| 180 | // TODO should 9 really be valid? |
| 181 | $pos += intval( $token ); |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Check if a move is valid |
| 188 | * |
| 189 | * @param array $move |
| 190 | * @param string $fen |
| 191 | * @return bool |
| 192 | */ |
| 193 | public function isValid( $move, $fen ) { |
| 194 | $this->setFen( $fen ); |
| 195 | if ( !isset( $move['from'] ) ) { |
| 196 | $fromAndTo = $this->getFromAndToByNotation( $move[ChessJson::MOVE_NOTATION] ); |
| 197 | $move['from'] = $fromAndTo['from']; |
| 198 | $move['to'] = $fromAndTo['to']; |
| 199 | |
| 200 | } |
| 201 | $from = ChessSquare::newFromCoords( $move['from'] )->getNumber(); |
| 202 | $to = ChessSquare::newFromCoords( $move['to'] )->getNumber(); |
| 203 | |
| 204 | $obj = $this->getValidMovesAndResult(); |
| 205 | $moves = $obj['moves']; |
| 206 | return isset( $moves[$from] ) && in_array( $to, $moves[$from] ); |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Returns en passant square or null |
| 211 | * |
| 212 | * @return int|null |
| 213 | */ |
| 214 | public function getEnPassantSquare() { |
| 215 | $enPassantSquare = $this->fenParts['enPassant']; |
| 216 | if ( $enPassantSquare === '-' ) { |
| 217 | return null; |
| 218 | } |
| 219 | return ChessSquare::newFromCoords( $enPassantSquare )->getNumber(); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Return color to move, "white" or "black" |
| 224 | * |
| 225 | * @return string |
| 226 | * @throws ChessBrowserException |
| 227 | */ |
| 228 | public function getColor() { |
| 229 | $color = $this->fenParts['color']; |
| 230 | switch ( $color ) { |
| 231 | case 'w': |
| 232 | return 'white'; |
| 233 | case 'b': |
| 234 | return 'black'; |
| 235 | default: |
| 236 | throw new ChessBrowserException( "Unknown color: $color" ); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Returns valid moves in 0x88 numeric format and result |
| 242 | * |
| 243 | * @return array |
| 244 | */ |
| 245 | public function getValidMovesAndResult() { |
| 246 | $color = $this->getColor(); |
| 247 | $ret = []; |
| 248 | $enPassantSquare = $this->getEnPassantSquare(); |
| 249 | |
| 250 | $isWhite = $color === 'white'; |
| 251 | |
| 252 | $kingSideCastle = $this->castlingTracker->checkCastle( $isWhite ? 'K' : 'k' ); |
| 253 | $queenSideCastle = $this->castlingTracker->checkCastle( $isWhite ? 'Q' : 'q' ); |
| 254 | |
| 255 | $oppositeColor = $isWhite ? 'black' : 'white'; |
| 256 | |
| 257 | $protectiveMoves = $this->getCaptureAndProtectiveMoves( $oppositeColor ); |
| 258 | |
| 259 | $checks = $this->getCountChecks( $color, $protectiveMoves ); |
| 260 | $validSquares = null; |
| 261 | $pinned = []; |
| 262 | if ( $checks === 2 ) { |
| 263 | $pieces = [ $this->cache['king' . $color] ]; |
| 264 | } else { |
| 265 | $pieces = $this->cache[$color]; |
| 266 | $pinned = $this->getPinned( $color ); |
| 267 | if ( $checks === 1 ) { |
| 268 | $validSquares = $this->getValidSquaresOnCheck( $color ); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | # New code section |
| 273 | # The above should be spun out |
| 274 | $totalCountMoves = 0; |
| 275 | foreach ( $pieces as $piece ) { |
| 276 | '@phan-var int[] $piece'; |
| 277 | $paths = $this->getValidMovePathsForPiece( |
| 278 | $piece, |
| 279 | $pinned, |
| 280 | $isWhite, |
| 281 | $protectiveMoves, |
| 282 | $kingSideCastle, |
| 283 | $queenSideCastle, |
| 284 | $enPassantSquare |
| 285 | ); |
| 286 | if ( $validSquares |
| 287 | && $piece['t'] != ChessPiece::WHITE_KING |
| 288 | && $piece['t'] != ChessPiece::BLACK_KING |
| 289 | ) { |
| 290 | $paths = $this->excludeInvalidSquares( $paths, $validSquares ); |
| 291 | } |
| 292 | $ret[$piece['s']] = $paths; |
| 293 | $totalCountMoves += count( $paths ); |
| 294 | } |
| 295 | $result = 0; |
| 296 | if ( $checks && !$totalCountMoves ) { |
| 297 | $result = $color === 'black' ? 1 : -1; |
| 298 | } elseif ( !$checks && !$totalCountMoves ) { |
| 299 | $result = 0.5; |
| 300 | } |
| 301 | $this->validMoves = [ 'moves' => $ret, 'result' => $result, 'check' => $checks ]; |
| 302 | return $this->validMoves; |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Analyze the possible moves for a specific piece |
| 307 | * |
| 308 | * @param array $piece |
| 309 | * @param array $pinned |
| 310 | * @param bool $isWhite |
| 311 | * @param string $protectiveMoves |
| 312 | * @param bool $kingSideCastle |
| 313 | * @param bool $queenSideCastle |
| 314 | * @param int|null $enPassantSquare |
| 315 | * @return array |
| 316 | */ |
| 317 | private function getValidMovePathsForPiece( |
| 318 | array $piece, |
| 319 | array $pinned, |
| 320 | bool $isWhite, |
| 321 | string $protectiveMoves, |
| 322 | bool $kingSideCastle, |
| 323 | bool $queenSideCastle, |
| 324 | $enPassantSquare |
| 325 | ): array { |
| 326 | $paths = []; |
| 327 | $type = $piece['t']; |
| 328 | $square = $piece['s']; |
| 329 | $isPinned = isset( $pinned[$square] ); |
| 330 | $pin = $pinned[$square] ?? [ 'by' => -1 ]; |
| 331 | $board = $this->cache['board']; |
| 332 | '@phan-var int[] $board'; |
| 333 | $directions = ChessPiece::newFromHex( $type )->getMovePatterns(); |
| 334 | |
| 335 | switch ( $type ) { |
| 336 | // pawns |
| 337 | case ChessPiece::WHITE_PAWN: |
| 338 | if ( !$isPinned || |
| 339 | SquareRelations::new( $square, $pin['by'] )->haveSameFile() |
| 340 | ) { |
| 341 | if ( !$board[$square + 16] ) { |
| 342 | $paths[] = $square + 16; |
| 343 | if ( $square < 32 && !$board[$square + 32] ) { |
| 344 | $paths[] = $square + 32; |
| 345 | } |
| 346 | } |
| 347 | } |
| 348 | if ( !$isPinned || $pin['by'] === $square + 15 ) { |
| 349 | if ( $enPassantSquare == $square + 15 || $board[$square + 15] & 0x8 ) { |
| 350 | $paths[] = $square + 15; |
| 351 | } |
| 352 | } |
| 353 | if ( isset( $board[$square + 17] ) && |
| 354 | ( !$isPinned || $pin['by'] === $square + 17 ) |
| 355 | ) { |
| 356 | if ( |
| 357 | $enPassantSquare == $square + 17 |
| 358 | || ( $board[$square + 17] && $board[$square + 17] & 0x8 ) |
| 359 | ) { |
| 360 | $paths[] = $square + 17; |
| 361 | } |
| 362 | } |
| 363 | break; |
| 364 | case ChessPiece::BLACK_PAWN: |
| 365 | if ( !$isPinned || |
| 366 | SquareRelations::new( $square, $pin['by'] )->haveSameFile() |
| 367 | ) { |
| 368 | if ( !$board[$square - 16] ) { |
| 369 | $paths[] = $square - 16; |
| 370 | if ( $square > 87 && !$board[$square - 32] ) { |
| 371 | $paths[] = $square - 32; |
| 372 | } |
| 373 | } |
| 374 | } |
| 375 | if ( !$isPinned || $pin['by'] === $square - 15 ) { |
| 376 | if ( |
| 377 | $enPassantSquare == $square - 15 |
| 378 | || ( $board[$square - 15] && !( $board[$square - 15] & 0x8 ) ) |
| 379 | ) { |
| 380 | $paths[] = $square - 15; |
| 381 | } |
| 382 | } |
| 383 | if ( $square - 17 >= 0 ) { |
| 384 | if ( !$isPinned || $pin['by'] === $square - 17 ) { |
| 385 | if ( |
| 386 | $enPassantSquare == $square - 17 |
| 387 | || ( $board[$square - 17] && !( $board[$square - 17] & 0x8 ) ) |
| 388 | ) { |
| 389 | $paths[] = $square - 17; |
| 390 | } |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | break; |
| 395 | // Sliding pieces |
| 396 | case ChessPiece::WHITE_BISHOP: |
| 397 | case ChessPiece::WHITE_ROOK: |
| 398 | case ChessPiece::WHITE_QUEEN: |
| 399 | case ChessPiece::BLACK_BISHOP: |
| 400 | case ChessPiece::BLACK_ROOK: |
| 401 | case ChessPiece::BLACK_QUEEN: |
| 402 | if ( $isPinned ) { |
| 403 | if ( array_search( $pin['direction'], $directions ) !== false ) { |
| 404 | $directions = [ $pin['direction'], $pin['direction'] * -1 ]; |
| 405 | } else { |
| 406 | $directions = []; |
| 407 | } |
| 408 | } |
| 409 | $oldSquare = $square; |
| 410 | foreach ( $directions as $aValue ) { |
| 411 | $square = $oldSquare + $aValue; |
| 412 | while ( ( $square & 0x88 ) === 0 ) { |
| 413 | if ( $board[$square] ) { |
| 414 | if ( !( $isWhite xor $board[$square] & 0x8 ) ) { |
| 415 | $paths[] = $square; |
| 416 | } |
| 417 | break; |
| 418 | } |
| 419 | $paths[] = $square; |
| 420 | $square += $aValue; |
| 421 | } |
| 422 | } |
| 423 | break; |
| 424 | case ChessPiece::WHITE_KNIGHT: |
| 425 | case ChessPiece::BLACK_KNIGHT: |
| 426 | if ( $isPinned ) { |
| 427 | break; |
| 428 | } |
| 429 | $oldSquare = $square; |
| 430 | for ( $a = 0, $lenD = count( $directions ); $a < $lenD; $a++ ) { |
| 431 | $square = $oldSquare + $directions[$a]; |
| 432 | if ( ( $square & 0x88 ) === 0 ) { |
| 433 | if ( $board[$square] ) { |
| 434 | if ( !( $isWhite xor $board[$square] & 0x8 ) ) { |
| 435 | $paths[] = $square; |
| 436 | } |
| 437 | } else { |
| 438 | $paths[] = $square; |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | break; |
| 443 | case ChessPiece::WHITE_KING: |
| 444 | case ChessPiece::BLACK_KING: |
| 445 | $oldSquare = $square; |
| 446 | for ( $a = 0, $lenD = count( $directions ); $a < $lenD; $a++ ) { |
| 447 | $square = $oldSquare + $directions[$a]; |
| 448 | if ( ( $square & 0x88 ) === 0 && |
| 449 | strpos( $protectiveMoves, $this->keySquares[$square] ) === false |
| 450 | ) { |
| 451 | if ( $board[$square] ) { |
| 452 | if ( !( $isWhite xor $board[$square] & 0x8 ) ) { |
| 453 | $paths[] = $square; |
| 454 | } |
| 455 | } else { |
| 456 | $paths[] = $square; |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | $square = $oldSquare; |
| 461 | |
| 462 | if ( $kingSideCastle |
| 463 | && !( $board[$square + 1] ) |
| 464 | && !( $board[$square + 2] ) |
| 465 | && $board[$square + 3] |
| 466 | && strpos( $protectiveMoves, $this->keySquares[$square] ) === false |
| 467 | && $square < 117 |
| 468 | && strpos( $protectiveMoves, $this->keySquares[$square + 1] ) === false |
| 469 | && strpos( $protectiveMoves, $this->keySquares[$square + 2] ) === false |
| 470 | ) { |
| 471 | $paths[] = $square + 2; |
| 472 | } |
| 473 | |
| 474 | if ( $queenSideCastle |
| 475 | && $square - 2 != -1 |
| 476 | && !( $board[$square - 1] ) |
| 477 | && !( $board[$square - 2] ) |
| 478 | && !( $board[$square - 3] ) |
| 479 | && $board[$square - 4] |
| 480 | && strpos( $protectiveMoves, $this->keySquares[$square] ) === false |
| 481 | && strpos( $protectiveMoves, $this->keySquares[$square - 1] ) === false |
| 482 | && strpos( $protectiveMoves, $this->keySquares[$square - 2] ) === false |
| 483 | ) { |
| 484 | $paths[] = $square - 2; |
| 485 | } |
| 486 | break; |
| 487 | } |
| 488 | return $paths; |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | * From a list of squares and valid squares, return the valid ones |
| 493 | * |
| 494 | * TODO document how is this different from using $validSquares? |
| 495 | * |
| 496 | * @param array $squares |
| 497 | * @param array $validSquares |
| 498 | * @return array |
| 499 | */ |
| 500 | private function excludeInvalidSquares( $squares, $validSquares ) { |
| 501 | return array_intersect( $squares, $validSquares ); |
| 502 | } |
| 503 | |
| 504 | /** |
| 505 | * Returns comma-separated string of moves (since it's faster to work with than arrays). |
| 506 | * |
| 507 | * @param string $color |
| 508 | * @return string |
| 509 | */ |
| 510 | public function getCaptureAndProtectiveMoves( $color ) { |
| 511 | $possible = []; |
| 512 | $actual = []; |
| 513 | |
| 514 | $pieces = $this->cache[$color]; |
| 515 | |
| 516 | $oppositeColor = $color === 'white' ? 'black' : 'white'; |
| 517 | $oppositeKing = $this->cache['king' . $oppositeColor]; |
| 518 | $oppositeKingSquare = $oppositeKing['s']; |
| 519 | |
| 520 | foreach ( $pieces as $piece ) { |
| 521 | '@phan-var int[] $piece'; |
| 522 | switch ( $piece['t'] ) { |
| 523 | // pawns |
| 524 | case ChessPiece::WHITE_PAWN: |
| 525 | $possible[] = $piece['s'] + 15; |
| 526 | $possible[] = $piece['s'] + 17; |
| 527 | break; |
| 528 | case ChessPiece::BLACK_PAWN: |
| 529 | $possible[] = $piece['s'] - 15; |
| 530 | $possible[] = $piece['s'] - 17; |
| 531 | break; |
| 532 | // Sliding pieces |
| 533 | case ChessPiece::WHITE_BISHOP: |
| 534 | case ChessPiece::WHITE_ROOK: |
| 535 | case ChessPiece::WHITE_QUEEN: |
| 536 | case ChessPiece::BLACK_BISHOP: |
| 537 | case ChessPiece::BLACK_ROOK: |
| 538 | case ChessPiece::BLACK_QUEEN: |
| 539 | $directions = ChessPiece::newFromHex( $piece['t'] )->getMovePatterns(); |
| 540 | for ( $a = 0, $lenA = count( $directions ); $a < $lenA; $a++ ) { |
| 541 | $square = $piece['s'] + $directions[$a]; |
| 542 | while ( ( $square & 0x88 ) === 0 ) { |
| 543 | if ( $this->cache['board'][$square] && $square !== $oppositeKingSquare ) { |
| 544 | $actual[] = $square; |
| 545 | break; |
| 546 | } |
| 547 | $actual[] = $square; |
| 548 | $square += $directions[$a]; |
| 549 | } |
| 550 | } |
| 551 | break; |
| 552 | case ChessPiece::WHITE_KNIGHT: |
| 553 | case ChessPiece::BLACK_KNIGHT: |
| 554 | // White knight |
| 555 | $directions = ChessPiece::newFromHex( $piece['t'] )->getMovePatterns(); |
| 556 | for ( $a = 0, $lenA = count( $directions ); $a < $lenA; $a++ ) { |
| 557 | $possible[] = $piece['s'] + $directions[$a]; |
| 558 | } |
| 559 | break; |
| 560 | case ChessPiece::WHITE_KING: |
| 561 | case ChessPiece::BLACK_KING: |
| 562 | $directions = ChessPiece::newFromHex( $piece['t'] )->getMovePatterns(); |
| 563 | foreach ( $directions as $v ) { |
| 564 | $possible[] = $piece['s'] + $v; |
| 565 | } |
| 566 | break; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | foreach ( $possible as $square ) { |
| 571 | if ( ( $square & 0x88 ) === 0 ) { |
| 572 | $actual[] = $square; |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | return ',' . implode( ",", $actual ) . ','; |
| 577 | } |
| 578 | |
| 579 | /** |
| 580 | * Get a list of sliding pieces attacking the king of a color |
| 581 | * |
| 582 | * @param string $color |
| 583 | * @return array |
| 584 | */ |
| 585 | public function getSlidingPiecesAttackingKing( $color ) { |
| 586 | $ret = []; |
| 587 | $king = $this->cache['king' . ( $color === 'white' ? 'black' : 'white' )]; |
| 588 | '@phan-var int[] $king'; |
| 589 | $pieces = $this->cache[$color]; |
| 590 | |
| 591 | foreach ( $pieces as $piece ) { |
| 592 | '@phan-var int[] $piece'; |
| 593 | if ( $piece['t'] & 0x4 ) { |
| 594 | $numericDistance = $king['s'] - $piece['s']; |
| 595 | $squareDistance = SquareRelations::new( $king['s'], $piece['s'] )->getDistance(); |
| 596 | $boardDistance = $numericDistance / $squareDistance; |
| 597 | |
| 598 | switch ( $piece['t'] ) { |
| 599 | case ChessPiece::WHITE_BISHOP: |
| 600 | case ChessPiece::BLACK_BISHOP: |
| 601 | if ( $numericDistance % 15 === 0 || $numericDistance % 17 === 0 ) { |
| 602 | $ret[] = ( [ 's' => $piece['s'], 'p' => $boardDistance ] ); |
| 603 | } |
| 604 | break; |
| 605 | case ChessPiece::WHITE_ROOK: |
| 606 | case ChessPiece::BLACK_ROOK: |
| 607 | if ( $numericDistance % 16 === 0 ) { |
| 608 | $ret[] = [ 's' => $piece['s'], 'p' => $boardDistance ]; |
| 609 | } elseif ( ( $piece['s'] & 240 ) == ( $king['s'] & 240 ) ) { |
| 610 | $ret[] = [ 's' => $piece['s'], 'p' => $numericDistance > 0 ? 1 : -1 ]; |
| 611 | } |
| 612 | break; |
| 613 | case ChessPiece::WHITE_QUEEN: |
| 614 | case ChessPiece::BLACK_QUEEN: |
| 615 | if ( |
| 616 | $numericDistance % 15 === 0 |
| 617 | || $numericDistance % 16 === 0 |
| 618 | || $numericDistance % 17 === 0 |
| 619 | ) { |
| 620 | $ret[] = [ 's' => $piece['s'], 'p' => $boardDistance ]; |
| 621 | } elseif ( ( $piece['s'] & 240 ) == ( $king['s'] & 240 ) ) { |
| 622 | $ret[] = ( [ 's' => $piece['s'], 'p' => $numericDistance > 0 ? 1 : -1 ] ); |
| 623 | } |
| 624 | break; |
| 625 | } |
| 626 | } |
| 627 | } |
| 628 | return $ret; |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * Return numeric squares(0x88) of pinned pieces |
| 633 | * |
| 634 | * @param string $color |
| 635 | * @return array |
| 636 | */ |
| 637 | public function getPinned( $color ): array { |
| 638 | $ret = []; |
| 639 | $isWhite = $color === 'white'; |
| 640 | $pieces = $this->getSlidingPiecesAttackingKing( $isWhite ? 'black' : 'white' ); |
| 641 | $king = $this->cache['king' . $color]; |
| 642 | $i = 0; |
| 643 | $countPieces = count( $pieces ); |
| 644 | $board = $this->cache['board']; |
| 645 | '@phan-var int[] $board'; |
| 646 | while ( $i < $countPieces ) { |
| 647 | $piece = $pieces[$i]; |
| 648 | $square = $piece['s'] + $piece['p']; |
| 649 | $countOpposite = 0; |
| 650 | |
| 651 | $squares = [ $piece['s'] ]; |
| 652 | $pinning = ''; |
| 653 | while ( $square !== $king['s'] && $countOpposite < 2 ) { |
| 654 | $squares[] = $square; |
| 655 | if ( $board[$square] ) { |
| 656 | $countOpposite++; |
| 657 | |
| 658 | if ( $isWhite xor ( $board[$square] & 0x8 ) ) { |
| 659 | $pinning = $square; |
| 660 | } else { |
| 661 | break; |
| 662 | } |
| 663 | } |
| 664 | $square += $piece['p']; |
| 665 | } |
| 666 | if ( $countOpposite === 1 ) { |
| 667 | $ret[$pinning] = [ 'by' => $piece['s'], 'direction' => $piece['p'] ]; |
| 668 | } |
| 669 | $i++; |
| 670 | } |
| 671 | return $ret; |
| 672 | } |
| 673 | |
| 674 | /** |
| 675 | * Get valid squares for other pieces than king to move to when in check |
| 676 | * |
| 677 | * i.e. squares which avoids the check. |
| 678 | * |
| 679 | * Example: if white king on g1 is checked by rook on g8, then valid squares for other pieces |
| 680 | * are the squares g2,g3,g4,g5,g6,g7,g8. |
| 681 | * Squares are returned in numeric format |
| 682 | * |
| 683 | * @param string $color |
| 684 | * @return array|null |
| 685 | */ |
| 686 | public function getValidSquaresOnCheck( $color ) { |
| 687 | $king = $this->cache['king' . $color]; |
| 688 | $pieces = $this->cache[$color === 'white' ? 'black' : 'white']; |
| 689 | |
| 690 | $enPassantSquare = $this->getEnPassantSquare(); |
| 691 | |
| 692 | foreach ( $pieces as $piece ) { |
| 693 | '@phan-var int[] $piece'; |
| 694 | switch ( $piece['t'] ) { |
| 695 | case ChessPiece::WHITE_PAWN: |
| 696 | if ( $king['s'] === $piece['s'] + 15 || $king['s'] === $piece['s'] + 17 ) { |
| 697 | if ( $enPassantSquare === $piece['s'] - 16 ) { |
| 698 | return [ $piece['s'], $enPassantSquare ]; |
| 699 | } |
| 700 | return [ $piece['s'] ]; |
| 701 | } |
| 702 | break; |
| 703 | case ChessPiece::BLACK_PAWN: |
| 704 | if ( $king['s'] === $piece['s'] - 15 || $king['s'] === $piece['s'] - 17 ) { |
| 705 | if ( $enPassantSquare === $piece['s'] + 16 ) { |
| 706 | return [ $piece['s'], $enPassantSquare ]; |
| 707 | } |
| 708 | return [ $piece['s'] ]; |
| 709 | } |
| 710 | break; |
| 711 | case ChessPiece::WHITE_KNIGHT: |
| 712 | case ChessPiece::BLACK_KNIGHT: |
| 713 | if ( SquareRelations::new( $piece['s'], $king['s'] )->getDistance() === 2 ) { |
| 714 | $directions = ChessPiece::newFromHex( $piece['t'] )->getMovePatterns(); |
| 715 | for ( $a = 0, $lenD = count( $directions ); $a < $lenD; $a++ ) { |
| 716 | $square = $piece['s'] + $directions[$a]; |
| 717 | if ( $square === $king['s'] ) { |
| 718 | return [ $piece['s'] ]; |
| 719 | } |
| 720 | } |
| 721 | } |
| 722 | break; |
| 723 | case ChessPiece::WHITE_BISHOP: |
| 724 | case ChessPiece::BLACK_BISHOP: |
| 725 | $checks = $this->getBishopCheckPath( $piece, $king ); |
| 726 | if ( $checks !== [] ) { |
| 727 | return $checks; |
| 728 | } |
| 729 | break; |
| 730 | case ChessPiece::WHITE_ROOK: |
| 731 | case ChessPiece::BLACK_ROOK: |
| 732 | $checks = $this->getRookCheckPath( $piece, $king ); |
| 733 | if ( $checks !== [] ) { |
| 734 | return $checks; |
| 735 | } |
| 736 | break; |
| 737 | case ChessPiece::WHITE_QUEEN: |
| 738 | case ChessPiece::BLACK_QUEEN: |
| 739 | $checks = $this->getRookCheckPath( $piece, $king ); |
| 740 | if ( $checks !== [] ) { |
| 741 | return $checks; |
| 742 | } |
| 743 | $checks = $this->getBishopCheckPath( $piece, $king ); |
| 744 | if ( $checks !== [] ) { |
| 745 | return $checks; |
| 746 | } |
| 747 | break; |
| 748 | } |
| 749 | } |
| 750 | |
| 751 | return null; |
| 752 | } |
| 753 | |
| 754 | /** |
| 755 | * Get the path by which a bishop is checking a king |
| 756 | * |
| 757 | * @param array $piece |
| 758 | * @param array $king |
| 759 | * @return array |
| 760 | */ |
| 761 | public function getBishopCheckPath( $piece, $king ): array { |
| 762 | if ( ( $king['s'] - $piece['s'] ) % 15 === 0 || ( $king['s'] - $piece['s'] ) % 17 === 0 ) { |
| 763 | $distance = SquareRelations::new( $piece['s'], $king['s'] )->getDistance(); |
| 764 | $direction = ( $king['s'] - $piece['s'] ) / $distance; |
| 765 | $square = $piece['s'] + $direction; |
| 766 | $pieceFound = false; |
| 767 | $squares = [ $piece['s'] ]; |
| 768 | while ( $square !== $king['s'] && !$pieceFound ) { |
| 769 | $squares[] = $square; |
| 770 | if ( isset( $this->cache['board'][$square] ) && $this->cache['board'][$square] ) { |
| 771 | $pieceFound = true; |
| 772 | } |
| 773 | $square += $direction; |
| 774 | } |
| 775 | if ( !$pieceFound ) { |
| 776 | return $squares; |
| 777 | } |
| 778 | } |
| 779 | return []; |
| 780 | } |
| 781 | |
| 782 | /** |
| 783 | * Get the path by which a rook is chekcing a king |
| 784 | * |
| 785 | * @param array $piece |
| 786 | * @param array $king |
| 787 | * @return array |
| 788 | */ |
| 789 | public function getRookCheckPath( $piece, $king ): array { |
| 790 | $direction = null; |
| 791 | $relations = SquareRelations::new( $piece['s'], $king['s'] ); |
| 792 | if ( $relations->haveSameFile() ) { |
| 793 | $direction = ( $king['s'] - $piece['s'] ) / $relations->getDistance(); |
| 794 | } elseif ( $relations->haveSameRank() ) { |
| 795 | $direction = $king['s'] > $piece['s'] ? 1 : -1; |
| 796 | } |
| 797 | |
| 798 | if ( $direction ) { |
| 799 | $square = $piece['s'] + $direction; |
| 800 | $pieceFound = false; |
| 801 | $squares = [ $piece['s'] ]; |
| 802 | while ( $square !== $king['s'] && !$pieceFound ) { |
| 803 | $squares[] = $square; |
| 804 | if ( $this->cache['board'][$square] ) { |
| 805 | $pieceFound = true; |
| 806 | } |
| 807 | $square += $direction; |
| 808 | } |
| 809 | if ( !$pieceFound ) { |
| 810 | return $squares; |
| 811 | } |
| 812 | } |
| 813 | return []; |
| 814 | } |
| 815 | |
| 816 | /** |
| 817 | * Counts the number of pieces checking the $king |
| 818 | * |
| 819 | * $king is set by FenParser0x88::parseFen and FenParser0x88::updatePieces |
| 820 | * where $king['s'] is the square the king occupies. To determine if the |
| 821 | * $king is in check, this method evaluates whether the square the king is |
| 822 | * on---$king['s']---is one (or more) of the squares the opponent's pieces |
| 823 | * can move to. |
| 824 | * |
| 825 | * Because FenParser0x88::getCaptureAndProtectiveMoves returns a string, this |
| 826 | * method searches that string to see how many times the king's square is in |
| 827 | * that list. Because the string '2' would match both '2' and '22', we |
| 828 | * ensure that it matches all and only the integer representing the king's |
| 829 | * square by searching for the integer surrounded by commas. The mapping from |
| 830 | * integer to substring (needle) is stored in Board0x88Config::$keySquares. |
| 831 | * |
| 832 | * @param string $kingColor Color of the king being checked; either |
| 833 | * 'white' or 'black' |
| 834 | * @param string $moveString a comma-delimited string of move targets, output |
| 835 | * by FenParser0x88::getCaptureAndProtectiveMoves. Each field is a |
| 836 | * square (represented by an integer) where the other player's pieces |
| 837 | * can move to. |
| 838 | * @see FenParser0x88::getCaptureAndProtectiveMoves |
| 839 | * @see Board0x88Config::$keySquares |
| 840 | * @return int |
| 841 | */ |
| 842 | public function getCountChecks( $kingColor, $moveString ) { |
| 843 | $king = $this->cache['king' . $kingColor]; |
| 844 | return substr_count( $moveString, $this->keySquares[$king['s']] ); |
| 845 | } |
| 846 | |
| 847 | /** |
| 848 | * Check if a move is en passant |
| 849 | * |
| 850 | * TODO combine ifs |
| 851 | * |
| 852 | * @param array $move |
| 853 | * @return bool |
| 854 | */ |
| 855 | public function isEnPassantMove( $move ) { |
| 856 | if ( |
| 857 | ( $this->cache['board'][$move['from']] === ChessPiece::WHITE_PAWN |
| 858 | || $this->cache['board'][$move['from']] === ChessPiece::BLACK_PAWN ) |
| 859 | ) { |
| 860 | if ( |
| 861 | !$this->cache['board'][$move['to']] && |
| 862 | ( |
| 863 | ( $move['from'] - $move['to'] ) % 17 === 0 |
| 864 | || ( $move['from'] - $move['to'] ) % 15 === 0 |
| 865 | ) |
| 866 | ) { |
| 867 | return true; |
| 868 | } |
| 869 | } |
| 870 | return false; |
| 871 | } |
| 872 | |
| 873 | /** |
| 874 | * Check if a move is castling |
| 875 | * |
| 876 | * TODO combine ifs |
| 877 | * |
| 878 | * @param array $move |
| 879 | * @return bool |
| 880 | */ |
| 881 | public function isCastleMove( $move ) { |
| 882 | if ( |
| 883 | ( $this->cache['board'][$move['from']] === ChessPiece::WHITE_KING |
| 884 | || $this->cache['board'][$move['from']] === ChessPiece::BLACK_KING ) |
| 885 | ) { |
| 886 | if ( SquareRelations::new( $move['from'], $move['to'] )->getDistance() === 2 ) { |
| 887 | return true; |
| 888 | } |
| 889 | } |
| 890 | return false; |
| 891 | } |
| 892 | |
| 893 | /** |
| 894 | * Convert string notation to array |
| 895 | * |
| 896 | * TODO make static |
| 897 | * |
| 898 | * @param string $notation |
| 899 | * @return array |
| 900 | */ |
| 901 | private function getFromAndToByLongNotation( $notation ) { |
| 902 | $notation = preg_replace( '/[^a-h0-8]/si', '', $notation ); |
| 903 | return [ |
| 904 | 'from' => substr( $notation, 0, 2 ), |
| 905 | 'to' => substr( $notation, 2, 2 ) |
| 906 | ]; |
| 907 | } |
| 908 | |
| 909 | /** |
| 910 | * Get the parsed form of a move |
| 911 | * |
| 912 | * @param string|array $move |
| 913 | * @return array |
| 914 | */ |
| 915 | public function getParsed( $move ) { |
| 916 | if ( is_string( $move ) ) { |
| 917 | $move = [ 'm' => $move ]; |
| 918 | } |
| 919 | |
| 920 | $move["m"] = preg_replace( "/([a-h])([a-h])([0-8])/s", "$1x$2$3", $move["m"] ); |
| 921 | |
| 922 | if ( isset( $move['m'] ) ) { |
| 923 | if ( $move['m'] == '--' ) { |
| 924 | $this->fen = null; |
| 925 | |
| 926 | // Switch active color |
| 927 | $this->fenParts['color'] = $this->fenParts['color'] == 'w' ? 'b' : 'w'; |
| 928 | |
| 929 | return [ |
| 930 | 'm' => $move['m'], |
| 931 | 'fen' => $this->getFen() |
| 932 | ]; |
| 933 | } |
| 934 | if ( is_string( $move['m'] ) && preg_match( '/^[a-h][0-8][a-h][0-8]$/', $move['m'] ) ) { |
| 935 | $fromAndTo = $this->getFromAndToByLongNotation( $move['m'] ); |
| 936 | } else { |
| 937 | $fromAndTo = $this->getFromAndToByNotation( $move['m'] ); |
| 938 | |
| 939 | } |
| 940 | } else { |
| 941 | $fromAndTo = $move; |
| 942 | } |
| 943 | |
| 944 | // Make the move and then recreate the fen |
| 945 | $this->updateBoardData( $fromAndTo ); |
| 946 | $this->fen = null; |
| 947 | |
| 948 | $newProperties = [ |
| 949 | 'from' => $fromAndTo['from'], |
| 950 | 'to' => $fromAndTo['to'], |
| 951 | 'fen' => $this->getFen() |
| 952 | ]; |
| 953 | return array_merge( $move, $newProperties ); |
| 954 | } |
| 955 | |
| 956 | /** |
| 957 | * Get from and to by notation |
| 958 | * |
| 959 | * TODO document |
| 960 | * |
| 961 | * @param string $notation |
| 962 | * @return array |
| 963 | * @throws ChessBrowserException |
| 964 | */ |
| 965 | public function getFromAndToByNotation( $notation ) { |
| 966 | $notation = str_replace( ".", "", $notation ); |
| 967 | $notationAnalyzer = new NotationAnalyzer( $notation ); |
| 968 | |
| 969 | $ret = [ 'promoteTo' => $notationAnalyzer->getPromotion() ]; |
| 970 | $color = $this->getColor(); |
| 971 | |
| 972 | $offset = ( $color === 'black' ? 112 : 0 ); |
| 973 | |
| 974 | $foundPieces = []; |
| 975 | $fromRank = $notationAnalyzer->getFromRank(); |
| 976 | $fromFile = $notationAnalyzer->getFromFile(); |
| 977 | |
| 978 | if ( strlen( $notation ) === 2 ) { |
| 979 | $square = ChessSquare::newFromCoords( $notation )->getNumber(); |
| 980 | $ret['to'] = $square; |
| 981 | $direction = $color === 'white' ? -16 : 16; |
| 982 | if ( $this->cache['board'][$square + $direction] ) { |
| 983 | $foundPieces[] = $square + $direction; |
| 984 | } else { |
| 985 | $foundPieces[] = $square + ( $direction * 2 ); |
| 986 | } |
| 987 | |
| 988 | } else { |
| 989 | $notation = preg_replace( "/=[QRBN]/", "", $notation ); |
| 990 | $notation = preg_replace( "/[\+#!\?]/s", "", $notation ); |
| 991 | $notation = preg_replace( "/^(.*?)[QRBN]$/s", "$1", $notation ); |
| 992 | $pieceType = $notationAnalyzer->getPieceType( $color ); |
| 993 | |
| 994 | $capture = strpos( $notation, "x" ) > 0; |
| 995 | |
| 996 | $ret['to'] = $notationAnalyzer->getTargetSquare(); |
| 997 | switch ( $pieceType ) { |
| 998 | case ChessPiece::WHITE_PAWN: |
| 999 | case ChessPiece::BLACK_PAWN: |
| 1000 | if ( $color === 'black' ) { |
| 1001 | $offsets = $capture ? [ 15, 17 ] : [ 16 ]; |
| 1002 | if ( $ret['to'] >= 64 ) { |
| 1003 | $offsets[] = 32; |
| 1004 | } |
| 1005 | } else { |
| 1006 | $offsets = $capture ? [ -15, -17 ] : [ -16 ]; |
| 1007 | if ( $ret['to'] < 64 ) { |
| 1008 | $offsets[] = -32; |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | foreach ( $offsets as $iValue ) { |
| 1013 | $sq = $ret['to'] + $iValue; |
| 1014 | if ( $this->cache['board'][$sq] && $this->cache['board'][$sq] === $pieceType ) { |
| 1015 | $foundPieces[] = ( $sq ); |
| 1016 | } |
| 1017 | } |
| 1018 | break; |
| 1019 | case ChessPiece::WHITE_KING: |
| 1020 | case ChessPiece::BLACK_KING: |
| 1021 | if ( $notation === 'O-O' ) { |
| 1022 | $foundPieces[] = ( $offset + 4 ); |
| 1023 | $ret['to'] = $offset + 6; |
| 1024 | } elseif ( $notation === 'O-O-O' ) { |
| 1025 | $foundPieces[] = ( $offset + 4 ); |
| 1026 | $ret['to'] = $offset + 2; |
| 1027 | } else { |
| 1028 | $k = $this->cache['king' . $color]; |
| 1029 | $foundPieces[] = $k['s']; |
| 1030 | } |
| 1031 | break; |
| 1032 | case ChessPiece::WHITE_KNIGHT: |
| 1033 | case ChessPiece::BLACK_KNIGHT: |
| 1034 | $pattern = ChessPiece::newFromHex( $pieceType )->getMovePatterns(); |
| 1035 | for ( $i = 0, $len = count( $pattern ); $i < $len; $i++ ) { |
| 1036 | $sq = $ret['to'] + $pattern[$i]; |
| 1037 | if ( !( $sq & 0x88 ) ) { |
| 1038 | if ( $this->cache['board'][$sq] && $this->cache['board'][$sq] === $pieceType ) { |
| 1039 | $foundPieces[] = ( $sq ); |
| 1040 | } |
| 1041 | } |
| 1042 | } |
| 1043 | break; |
| 1044 | // Sliding pieces |
| 1045 | default: |
| 1046 | $patterns = ChessPiece::newFromHex( $pieceType )->getMovePatterns(); |
| 1047 | for ( $i = 0, $len = count( $patterns ); $i < $len; $i++ ) { |
| 1048 | $sq = $ret['to'] + $patterns[$i]; |
| 1049 | while ( !( $sq & 0x88 ) ) { |
| 1050 | if ( $this->cache['board'][$sq] && $this->cache['board'][$sq] === $pieceType ) { |
| 1051 | $foundPieces[] = ( $sq ); |
| 1052 | } |
| 1053 | if ( $this->cache['board'][$sq] ) { |
| 1054 | break; |
| 1055 | } |
| 1056 | $sq += $patterns[$i]; |
| 1057 | } |
| 1058 | } |
| 1059 | break; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | if ( count( $foundPieces ) === 1 ) { |
| 1064 | $ret['from'] = $foundPieces[0]; |
| 1065 | } else { |
| 1066 | if ( $fromRank !== null && $fromRank >= 0 ) { |
| 1067 | for ( $i = 0, $len = count( $foundPieces ); $i < $len; $i++ ) { |
| 1068 | if ( SquareRelations::new( $foundPieces[$i], $fromRank )->haveSameRank() ) { |
| 1069 | $ret['from'] = $foundPieces[$i]; |
| 1070 | break; |
| 1071 | } |
| 1072 | } |
| 1073 | } elseif ( $fromFile !== null && $fromFile >= 0 ) { |
| 1074 | for ( $i = 0, $len = count( $foundPieces ); $i < $len; $i++ ) { |
| 1075 | if ( SquareRelations::new( $foundPieces[$i], $fromFile )->haveSameFile() ) { |
| 1076 | $ret['from'] = $foundPieces[$i]; |
| 1077 | break; |
| 1078 | } |
| 1079 | } |
| 1080 | } |
| 1081 | |
| 1082 | if ( !isset( $ret['from'] ) ) { |
| 1083 | $config = $this->getValidMovesAndResult(); |
| 1084 | $moves = $config['moves']; |
| 1085 | foreach ( $foundPieces as $piece ) { |
| 1086 | if ( in_array( $ret['to'], $moves[$piece] ) ) { |
| 1087 | $ret['from'] = $piece; |
| 1088 | break; |
| 1089 | } |
| 1090 | } |
| 1091 | } |
| 1092 | } |
| 1093 | // TODO some pgn files may not have correct notations for all moves. |
| 1094 | // Example Nd7 which may be from b2 or f6. |
| 1095 | // this may cause problems later on in the game. Figure out a way to handle this. |
| 1096 | #if (count($foundPieces) === 2){ |
| 1097 | #$ret['from'] = $foundPieces[1]; |
| 1098 | #throw new Exception("Unable to decide which move to take for notation: ". $notation); |
| 1099 | #} |
| 1100 | |
| 1101 | if ( !isset( $ret['from'] ) ) { |
| 1102 | $msg = "Fen: " |
| 1103 | . $this->fen |
| 1104 | . "\ncolor: " |
| 1105 | . $color |
| 1106 | . "\nnotation: " |
| 1107 | . $notation |
| 1108 | . "\nRank:" |
| 1109 | . $fromRank |
| 1110 | . "\nFile:" |
| 1111 | . $fromFile |
| 1112 | . "\n" |
| 1113 | . count( $foundPieces ) |
| 1114 | . ", " |
| 1115 | . implode( ",", $foundPieces ); |
| 1116 | throw new ChessBrowserException( $msg ); |
| 1117 | } |
| 1118 | $ret['from'] = ChessSquare::newFromNumber( $ret['from'] )->getCoords(); |
| 1119 | $ret['to'] = ChessSquare::newFromNumber( $ret['to'] )->getCoords(); |
| 1120 | |
| 1121 | return $ret; |
| 1122 | } |
| 1123 | |
| 1124 | /** |
| 1125 | * Make a move on the board |
| 1126 | * |
| 1127 | * Example: |
| 1128 | * |
| 1129 | * $parser = new FenParser0x88(); |
| 1130 | * $parser->newGame(); |
| 1131 | * $parser->move("Nf3"); |
| 1132 | * |
| 1133 | * $move can be a string like Nf3, g1f3 or an array with from and to squares, |
| 1134 | * like array("from" => "g1", "to"=>"f3") |
| 1135 | * |
| 1136 | * @param string|array $move |
| 1137 | * @throws ChessBrowserException |
| 1138 | */ |
| 1139 | public function move( $move ) { |
| 1140 | if ( is_string( $move ) ) { |
| 1141 | if ( strlen( $move ) === 4 ) { |
| 1142 | $move = $this->getFromAndToByLongNotation( $move ); |
| 1143 | } else { |
| 1144 | $move = $this->getFromAndToByNotation( $move ); |
| 1145 | } |
| 1146 | } |
| 1147 | |
| 1148 | $validMovesAndResult = $this->getValidMovesAndResult(); |
| 1149 | $validMoves = $validMovesAndResult["moves"]; |
| 1150 | |
| 1151 | $from = ChessSquare::newFromCoords( $move['from'] )->getNumber(); |
| 1152 | $to = ChessSquare::newFromCoords( $move['to'] )->getNumber(); |
| 1153 | |
| 1154 | if ( empty( $validMoves[$from] ) || !in_array( $to, $validMoves[$from] ) ) { |
| 1155 | throw new ChessBrowserException( |
| 1156 | "Invalid move " . $this->getColor() . " - " . json_encode( $move ) |
| 1157 | ); |
| 1158 | } |
| 1159 | |
| 1160 | $this->fen = null; |
| 1161 | $this->validMoves = null; |
| 1162 | $this->notation = $this->getNotationForAMove( $move ); |
| 1163 | $this->updateBoardData( $move ); |
| 1164 | |
| 1165 | $config = $this->getValidMovesAndResult(); |
| 1166 | |
| 1167 | if ( $config['result'] === 1 || $config['result'] === -1 ) { |
| 1168 | $this->notation .= '#'; |
| 1169 | } elseif ( $config['check'] > 0 ) { |
| 1170 | $this->notation .= '+'; |
| 1171 | } |
| 1172 | } |
| 1173 | |
| 1174 | /** |
| 1175 | * updateBoardData based on passed move |
| 1176 | * |
| 1177 | * @param array $move |
| 1178 | */ |
| 1179 | private function updateBoardData( $move ) { |
| 1180 | $move = [ |
| 1181 | 'from' => ChessSquare::newFromCoords( $move['from'] )->getNumber(), |
| 1182 | 'to' => ChessSquare::newFromCoords( $move['to'] )->getNumber(), |
| 1183 | 'promoteTo' => $move['promoteTo'] ?? '' |
| 1184 | ]; |
| 1185 | $board = $this->cache['board']; |
| 1186 | '@phan-var int[] $board'; |
| 1187 | $movedPiece = $board[$move['from']]; |
| 1188 | $color = ( $movedPiece & 0x8 ) ? 'black' : 'white'; |
| 1189 | $enPassant = '-'; |
| 1190 | |
| 1191 | $incrementHalfMoves = !( $board[$move['to']] ); |
| 1192 | |
| 1193 | if ( $board[$move['from']] === ChessPiece::WHITE_PAWN |
| 1194 | || $board[$move['from']] === ChessPiece::BLACK_PAWN |
| 1195 | ) { |
| 1196 | $incrementHalfMoves = false; |
| 1197 | if ( $this->isEnPassantMove( $move ) ) { |
| 1198 | if ( $color == 'black' ) { |
| 1199 | $this->cache['board'][$move['to'] + 16] = null; |
| 1200 | } else { |
| 1201 | $this->cache['board'][$move['to'] - 16] = null; |
| 1202 | } |
| 1203 | } |
| 1204 | |
| 1205 | if ( |
| 1206 | ( $move['from'] & 15 ) == ( $move['to'] & 15 ) |
| 1207 | && SquareRelations::new( $move['from'], $move['to'] )->getDistance() == 2 |
| 1208 | ) { |
| 1209 | if ( $color === 'white' ) { |
| 1210 | $number = $move['from'] + 16; |
| 1211 | } else { |
| 1212 | $number = $move['from'] - 16; |
| 1213 | } |
| 1214 | $enPassant = ChessSquare::newFromNumber( $number )->getCoords(); |
| 1215 | } |
| 1216 | } |
| 1217 | |
| 1218 | $this->fenParts['enPassant'] = $enPassant; |
| 1219 | |
| 1220 | if ( $this->isCastleMove( [ 'from' => $move['from'], 'to' => $move['to'] ] ) ) { |
| 1221 | if ( $color == 'white' ) { |
| 1222 | $castleNotation = '/[KQ]/s'; |
| 1223 | $pieceType = ChessPiece::WHITE_ROOK; |
| 1224 | $offset = 0; |
| 1225 | } else { |
| 1226 | $castleNotation = '/[kq]/s'; |
| 1227 | $pieceType = ChessPiece::BLACK_ROOK; |
| 1228 | $offset = 112; |
| 1229 | } |
| 1230 | |
| 1231 | if ( $move['from'] < $move['to'] ) { |
| 1232 | $this->cache['board'][7 + $offset] = null; |
| 1233 | $this->cache['board'][5 + $offset] = $pieceType; |
| 1234 | |
| 1235 | } else { |
| 1236 | $this->cache['board'][0 + $offset] = null; |
| 1237 | $this->cache['board'][3 + $offset] = $pieceType; |
| 1238 | } |
| 1239 | $newCastle = preg_replace( $castleNotation, '', $this->fenParts['castle'] ); |
| 1240 | $this->castlingTracker = new CastlingTracker( $newCastle ); |
| 1241 | $this->fenParts['castle'] = $newCastle; |
| 1242 | } else { |
| 1243 | $this->castlingTracker = new CastlingTracker( $this->fenParts['castle'] ); |
| 1244 | $this->fenParts['castle'] = $this->castlingTracker->updateForMove( |
| 1245 | $movedPiece, |
| 1246 | $move['from'] |
| 1247 | ); |
| 1248 | } |
| 1249 | |
| 1250 | if ( $color === 'black' ) { |
| 1251 | $this->fenParts['fullMoves']++; |
| 1252 | } |
| 1253 | if ( $incrementHalfMoves ) { |
| 1254 | $this->fenParts['halfMoves']++; |
| 1255 | } else { |
| 1256 | $this->fenParts['halfMoves'] = 0; |
| 1257 | } |
| 1258 | |
| 1259 | $this->cache['board'][$move['to']] = $this->cache['board'][$move['from']]; |
| 1260 | $this->cache['board'][$move['from']] = null; |
| 1261 | if ( $move['promoteTo'] ) { |
| 1262 | $pieceStr = $move['promoteTo']; |
| 1263 | if ( $color === 'white' ) { |
| 1264 | // $move stores target as lowercase, regardless of color |
| 1265 | $pieceStr = strtoupper( $pieceStr ); |
| 1266 | } |
| 1267 | $piece = new ChessPiece( $pieceStr ); |
| 1268 | $this->cache['board'][$move['to']] = $piece->getAsHex(); |
| 1269 | } |
| 1270 | |
| 1271 | $this->fenParts['color'] = ( $this->fenParts['color'] == 'w' ) ? 'b' : 'w'; |
| 1272 | |
| 1273 | $this->updatePieces(); |
| 1274 | } |
| 1275 | |
| 1276 | /** |
| 1277 | * updatePieces |
| 1278 | * |
| 1279 | * TODO document |
| 1280 | */ |
| 1281 | private function updatePieces() { |
| 1282 | $this->cache['white'] = []; |
| 1283 | $this->cache['black'] = []; |
| 1284 | |
| 1285 | foreach ( range( 0, 119 ) as $i ) { |
| 1286 | if ( $i & 0x88 ) { |
| 1287 | continue; |
| 1288 | } |
| 1289 | $piece = $this->cache['board'][$i]; |
| 1290 | if ( $piece ) { |
| 1291 | $color = $piece & 0x8 ? 'black' : 'white'; |
| 1292 | $obj = [ |
| 1293 | 't' => $piece, |
| 1294 | 's' => $i |
| 1295 | ]; |
| 1296 | $this->cache[$color][] = $obj; |
| 1297 | |
| 1298 | if ( $piece === ChessPiece::WHITE_KING |
| 1299 | || $piece == ChessPiece::BLACK_KING |
| 1300 | ) { |
| 1301 | $this->cache['king' . $color] = $obj; |
| 1302 | } |
| 1303 | } |
| 1304 | } |
| 1305 | } |
| 1306 | |
| 1307 | /** |
| 1308 | * Returns FEN for current position |
| 1309 | * |
| 1310 | * @return string |
| 1311 | */ |
| 1312 | public function getFen() { |
| 1313 | if ( !$this->fen ) { |
| 1314 | $this->fen = $this->getNewFen(); |
| 1315 | } |
| 1316 | return $this->fen; |
| 1317 | } |
| 1318 | |
| 1319 | /** |
| 1320 | * Convert a move to notation |
| 1321 | * |
| 1322 | * Does NOT add + or #, so it is an incomplete notation |
| 1323 | * |
| 1324 | * @param array $move |
| 1325 | * @return string |
| 1326 | */ |
| 1327 | private function getNotationForAMove( $move ) { |
| 1328 | $fromSquare = ChessSquare::newFromCoords( $move['from'] ); |
| 1329 | $toSquare = ChessSquare::newFromCoords( $move['to'] ); |
| 1330 | $move['from'] = $fromSquare->getNumber(); |
| 1331 | $move['to'] = $toSquare->getNumber(); |
| 1332 | $type = $this->cache['board'][$move['from']]; |
| 1333 | |
| 1334 | $ret = ChessPiece::newFromHex( $type )->getNotation(); |
| 1335 | |
| 1336 | switch ( $type ) { |
| 1337 | case ChessPiece::WHITE_PAWN: |
| 1338 | case ChessPiece::BLACK_PAWN: |
| 1339 | if ( $this->isEnPassantMove( $move ) || $this->cache['board'][$move['to']] ) { |
| 1340 | $ret .= $fromSquare->getFile() . 'x'; |
| 1341 | } |
| 1342 | |
| 1343 | $ret .= $toSquare->getCoords(); |
| 1344 | |
| 1345 | if ( isset( $move['promoteTo'] ) && $move['promoteTo'] ) { |
| 1346 | $promotedTo = new ChessPiece( $move['promoteTo'] ); |
| 1347 | $ret .= '=' . $promotedTo->getNotation(); |
| 1348 | } |
| 1349 | break; |
| 1350 | case ChessPiece::WHITE_KNIGHT: |
| 1351 | case ChessPiece::BLACK_KNIGHT: |
| 1352 | case ChessPiece::WHITE_BISHOP: |
| 1353 | case ChessPiece::BLACK_BISHOP: |
| 1354 | case ChessPiece::WHITE_ROOK: |
| 1355 | case ChessPiece::BLACK_ROOK: |
| 1356 | case ChessPiece::WHITE_QUEEN: |
| 1357 | case ChessPiece::BLACK_QUEEN: |
| 1358 | $config = $this->getValidMovesAndResult(); |
| 1359 | |
| 1360 | $configMoves = $config['moves']; |
| 1361 | foreach ( $configMoves as $square => $moves ) { |
| 1362 | if ( |
| 1363 | $square != $move['from'] |
| 1364 | && $this->cache['board'][$square] === $type |
| 1365 | && array_search( $move['to'], $moves ) !== false |
| 1366 | ) { |
| 1367 | if ( ( $square & 15 ) != ( $move['from'] & 15 ) ) { |
| 1368 | $ret .= $fromSquare->getFile(); |
| 1369 | } elseif ( ( $square & 240 ) != ( $move['from'] & 240 ) ) { |
| 1370 | $ret .= (string)$fromSquare->getRank(); |
| 1371 | } |
| 1372 | } |
| 1373 | } |
| 1374 | |
| 1375 | if ( $this->cache['board'][$move['to']] ) { |
| 1376 | $ret .= 'x'; |
| 1377 | } |
| 1378 | |
| 1379 | $ret .= $toSquare->getCoords(); |
| 1380 | break; |
| 1381 | case ChessPiece::WHITE_KING: |
| 1382 | case ChessPiece::BLACK_KING: |
| 1383 | if ( $this->isCastleMove( $move ) ) { |
| 1384 | if ( $move['to'] > $move['from'] ) { |
| 1385 | $ret = 'O-O'; |
| 1386 | } else { |
| 1387 | $ret = 'O-O-O'; |
| 1388 | } |
| 1389 | } else { |
| 1390 | if ( $this->cache['board'][$move['to']] ) { |
| 1391 | $ret .= 'x'; |
| 1392 | } |
| 1393 | |
| 1394 | $ret .= $toSquare->getCoords(); |
| 1395 | } |
| 1396 | break; |
| 1397 | |
| 1398 | } |
| 1399 | |
| 1400 | return $ret; |
| 1401 | } |
| 1402 | |
| 1403 | /** |
| 1404 | * Get a new fen |
| 1405 | * |
| 1406 | * @return string |
| 1407 | */ |
| 1408 | private function getNewFen() { |
| 1409 | $board = $this->cache['board']; |
| 1410 | $fen = ''; |
| 1411 | $emptyCounter = 0; |
| 1412 | |
| 1413 | // @phan-suppress-next-line PhanTypeInvalidUnaryOperandIncOrDec |
| 1414 | for ( $rank = 7; $rank >= 0; $rank-- ) { |
| 1415 | for ( $file = 0; $file < 8; $file++ ) { |
| 1416 | $index = ( $rank * 8 ) + $file; |
| 1417 | $mapped = ChessSquare::newFromLateral64( $index )->getNumber(); |
| 1418 | if ( $board[$mapped] ) { |
| 1419 | if ( $emptyCounter ) { |
| 1420 | $fen .= $emptyCounter; |
| 1421 | } |
| 1422 | $fen .= ChessPiece::newFromHex( $board[$mapped] ) |
| 1423 | ->getSymbol(); |
| 1424 | $emptyCounter = 0; |
| 1425 | } else { |
| 1426 | $emptyCounter++; |
| 1427 | } |
| 1428 | } |
| 1429 | if ( $rank ) { |
| 1430 | if ( $emptyCounter ) { |
| 1431 | $fen .= $emptyCounter; |
| 1432 | } |
| 1433 | $fen .= '/'; |
| 1434 | $emptyCounter = 0; |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | if ( $emptyCounter ) { |
| 1439 | $fen .= $emptyCounter; |
| 1440 | } |
| 1441 | return $fen |
| 1442 | . ' ' |
| 1443 | . $this->fenParts['color'] |
| 1444 | . ' ' |
| 1445 | . $this->fenParts['castle'] |
| 1446 | . ' ' |
| 1447 | . $this->fenParts['enPassant'] |
| 1448 | . ' ' |
| 1449 | . $this->fenParts['halfMoves'] |
| 1450 | . ' ' |
| 1451 | . $this->fenParts['fullMoves']; |
| 1452 | } |
| 1453 | } |