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