mambax7 /
chess
| Total Complexity | 497 |
| Total Lines | 2281 |
| Duplicated Lines | 0 % |
| Changes | 5 | ||
| Bugs | 0 | Features | 0 |
Complex classes like ChessGame often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ChessGame, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 55 | class ChessGame |
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| 56 | { |
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| 57 | /** |
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| 58 | * Indicates whether object is valid. |
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| 59 | * |
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| 60 | * If empty string (''), indicates this is a valid object; otherwise contains an error message. |
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| 61 | * Should be checked after creating an instance of this class. |
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| 62 | * |
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| 63 | * @var string $error |
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| 64 | */ |
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| 65 | |||
| 66 | public $error; |
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| 67 | /** |
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| 68 | * gamestate |
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| 69 | * |
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| 70 | * The game state is represented as an array with the following elements: |
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| 71 | * |
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| 72 | * - 'fen_piece_placement' |
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| 73 | * - 'fen_active_color' |
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| 74 | * - 'fen_castling_availability' |
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| 75 | * - 'fen_en_passant_target_square' |
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| 76 | * - 'fen_halfmove_clock' |
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| 77 | * - 'fen_fullmove_number' |
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| 78 | * - 'pgn_result' |
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| 79 | * - 'pgn_fen' |
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| 80 | * - 'pgn_movetext' |
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| 81 | * |
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| 82 | * The elements prefixed with 'fen_' are standard Forsyth-Edwards Notation (FEN) elements, |
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| 83 | * and the elements prefixed with 'pgn_' are standard Portable Game Notation (PGN) elements. |
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| 84 | * |
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| 85 | * Each element is a string. |
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| 86 | * |
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| 87 | * @var array $gamestate |
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| 88 | */ |
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| 89 | |||
| 90 | public $gamestate; |
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| 91 | /** |
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| 92 | * board |
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| 93 | * |
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| 94 | * A 64-element array, constructed from fen_piece_placement, is used for handling moves. |
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| 95 | * Its indices are related to the standard tile coordinates as follows: |
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| 96 | * |
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| 97 | * <pre> |
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| 98 | * 8 | 56 57 58 59 60 61 62 63 |
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| 99 | * 7 | 48 49 50 51 52 53 54 55 |
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| 100 | * 6 | 40 41 42 43 44 45 46 47 |
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| 101 | * 5 | 32 33 34 35 36 37 38 39 |
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| 102 | * 4 | 24 25 26 27 28 29 30 31 |
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| 103 | * 3 | 16 17 18 19 20 21 22 23 |
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| 104 | * 2 | 8 9 10 11 12 13 14 15 |
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| 105 | * 1 | 0 1 2 3 4 5 6 7 |
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| 106 | * ------------------------ |
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| 107 | * a b c d e f g h |
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| 108 | * </pre> |
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| 109 | * |
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| 110 | * For example, $board[17] is tile b3 and $board[55] is tile h7. |
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| 111 | * |
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| 112 | * @var array $board |
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| 113 | */ |
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| 114 | |||
| 115 | public $board; |
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| 116 | /** |
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| 117 | * for auto-completion of moves |
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| 118 | * @var string $ac_move |
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| 119 | */ |
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| 120 | |||
| 121 | public $ac_move; |
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| 122 | /** |
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| 123 | * array of white's pieces |
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| 124 | * @var array $w_figures |
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| 125 | */ |
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| 126 | |||
| 127 | public $w_figures; |
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| 128 | /** |
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| 129 | * array of black's pieces |
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| 130 | * @var array $b_figures |
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| 131 | */ |
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| 132 | |||
| 133 | public $b_figures; |
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| 134 | /** |
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| 135 | * updated by handleMove, not used now but might be used in future |
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| 136 | * @var string $last_move |
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| 137 | */ |
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| 138 | |||
| 139 | public $last_move; |
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| 140 | /** |
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| 141 | * updated by handleMove, not used now but might be used in future |
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| 142 | * @var string $captured_piece |
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| 143 | */ |
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| 144 | |||
| 145 | public $captured_piece; |
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| 146 | // -------------- |
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| 147 | |||
| 148 | // PUBLIC METHODS |
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| 149 | |||
| 150 | // -------------- |
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| 151 | |||
| 152 | /** |
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| 153 | * constructor |
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| 154 | * |
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| 155 | * If a failure occurs, $this->error is set to a string containing an error message; |
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| 156 | * otherwise $this->error is set to an empty string. |
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| 157 | * |
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| 158 | * Example: |
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| 159 | * <pre> |
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| 160 | * $chessgame = new ChessGame($fen); |
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| 161 | * if (!empty($chessgame->error)) { |
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| 162 | * echo "'$fen' invalid: $chessgame->error\n"; |
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| 163 | * } |
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| 164 | * </pre> |
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| 165 | * |
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| 166 | * @param mixed $param If $param is an array, an existing game is loaded using $param as the nine-element gamestate array described above. |
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| 167 | * If $param is a non-empty string, a new game is created using $param as a FEN setup position. |
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| 168 | * Otherwise, a new game is created using the standard starting position. |
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| 169 | */ |
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| 170 | public function __construct($param = null) |
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| 171 | { |
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| 172 | // for now |
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| 173 | |||
| 174 | $this->browsing_mode = 0; |
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|
Bug
Best Practice
introduced
by
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| 175 | |||
| 176 | if (\is_array($param)) { |
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| 177 | $this->gamestate = $param; |
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| 178 | |||
| 179 | $this->error = ''; |
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| 180 | } elseif (\is_string($param) && !empty($param)) { |
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| 181 | $this->error = $this->init_gamestate($param); |
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| 182 | } else { |
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| 183 | $this->init_gamestate(); |
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| 184 | |||
| 185 | $this->error = ''; |
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| 186 | } |
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| 187 | } |
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| 188 | |||
| 189 | /** |
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| 190 | * Handle a move. |
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| 191 | * |
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| 192 | * @param string $move |
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| 193 | * @return array A two-element array: |
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| 194 | * - $move_performed: true if the move was performed and the game state has been updated, false otherwise |
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| 195 | * - $move_result_text: text message |
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| 196 | */ |
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| 197 | public function move($move) |
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| 198 | { |
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| 199 | empty($this->error) or \trigger_error(_MD_CHESS_ERROR, \E_USER_ERROR); |
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| 200 | |||
| 201 | return $this->handleMove($move); |
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| 202 | } |
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| 203 | |||
| 204 | /** |
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| 205 | * get game state |
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| 206 | * |
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| 207 | * @return array |
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| 208 | */ |
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| 209 | public function gamestate() |
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| 214 | } |
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| 215 | |||
| 216 | // ---------------------------------------------------------------- |
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| 217 | |||
| 218 | // PRIVATE METHODS - intended for use only by methods of this class |
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| 219 | |||
| 220 | // ---------------------------------------------------------------- |
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| 221 | |||
| 222 | /** |
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| 223 | * Initialize gamestate for a new game. |
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| 224 | * |
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| 225 | * If a non-empty string $fen is provided, the game is initialized using $fen as a FEN setup position. |
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| 226 | * Otherwise the game is initialized using the standard starting position. |
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| 227 | * |
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| 228 | * @param string $fen |
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| 229 | * @return string empty string on success, or error message on failure |
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| 230 | * |
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| 231 | * @access private |
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| 232 | */ |
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| 233 | public function init_gamestate($fen = null) |
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| 234 | { |
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| 235 | $this->gamestate = []; |
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| 236 | |||
| 237 | if (!empty($fen)) { |
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| 238 | $setup = true; |
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| 239 | } else { |
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| 240 | $setup = false; |
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| 241 | |||
| 242 | $fen = 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'; |
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| 243 | } |
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| 244 | |||
| 245 | // check that data is not unreasonably short or long |
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| 246 | |||
| 247 | if (\mb_strlen($fen) < 23 || \mb_strlen($fen) > 100) { |
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| 248 | return _MD_CHESS_FENBAD_LENGTH; // invalid length |
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| 249 | } |
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| 250 | |||
| 251 | $fen_data = \explode(' ', $fen); |
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| 252 | |||
| 253 | if (6 != \count($fen_data)) { |
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| 254 | return _MD_CHESS_FENBAD_FIELD_COUNT; // wrong number of fields |
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| 255 | } |
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| 256 | |||
| 257 | $this->gamestate['fen_piece_placement'] = $fen_data[0]; |
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| 258 | |||
| 259 | $this->gamestate['fen_active_color'] = $fen_data[1]; |
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| 260 | |||
| 261 | $this->gamestate['fen_castling_availability'] = $fen_data[2]; |
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| 262 | |||
| 263 | $this->gamestate['fen_en_passant_target_square'] = $fen_data[3]; |
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| 264 | |||
| 265 | $this->gamestate['fen_halfmove_clock'] = $fen_data[4]; |
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| 266 | |||
| 267 | $this->gamestate['fen_fullmove_number'] = $fen_data[5]; |
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| 268 | |||
| 269 | $this->gamestate['pgn_fen'] = $setup ? $fen : null; |
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| 270 | |||
| 271 | $this->gamestate['pgn_result'] = '*'; |
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| 272 | |||
| 273 | $this->gamestate['pgn_movetext'] = '*'; |
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| 274 | |||
| 275 | if (!$this->fen_piece_placement_to_board()) { |
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| 276 | return _MD_CHESS_FENBAD_PP_INVALID; // piece_placement invalid |
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| 277 | } elseif ('w' != $this->gamestate['fen_active_color'] && 'b' != $this->gamestate['fen_active_color']) { |
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| 278 | return _MD_CHESS_FENBAD_AC_INVALID; // active_color invalid |
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| 279 | } // Since fen_piece_placement_to_board() checked $fen for the correct number of fields above, $castling_availability is non-empty. |
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| 280 | |||
| 281 | elseif ('-' != $this->gamestate['fen_castling_availability'] && !\preg_match('/^K?Q?k?q?$/', $this->gamestate['fen_castling_availability'])) { |
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| 282 | return _MD_CHESS_FENBAD_CA_INVALID; // castling_availability invalid |
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| 283 | } elseif ('-' != $this->gamestate['fen_en_passant_target_square'] && !\preg_match('/^[a-h][36]$/', $this->gamestate['fen_en_passant_target_square'])) { |
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| 284 | return _MD_CHESS_FENBAD_EP_INVALID; // en_passant_target_square invalid |
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| 285 | } elseif (!\preg_match('/^\d{0,4}$/', $this->gamestate['fen_halfmove_clock'])) { |
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| 286 | return _MD_CHESS_FENBAD_HC_INVALID; // halfmove_clock invalid |
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| 287 | } elseif (!\preg_match('/^\d{0,4}$/', $this->gamestate['fen_fullmove_number']) || $this->gamestate['fen_fullmove_number'] < 1) { |
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| 288 | return _MD_CHESS_FENBAD_FN_INVALID; // fullmove_number invalid |
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| 289 | } elseif ($this->insufficient_mating_material()) { |
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| 290 | return _MD_CHESS_FENBAD_MATERIAL; // insufficient mating material |
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| 291 | } elseif (('w' == $this->gamestate['fen_active_color'] && $this->kingIsUnderAttack('b', 'w')) |
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| 292 | || ('b' == $this->gamestate['fen_active_color'] && $this->kingIsUnderAttack('w', 'b'))) { |
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| 293 | return _MD_CHESS_FENBAD_IN_CHECK; // player to move cannot have opponent in check |
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| 294 | } elseif ((\mb_strstr($this->gamestate['fen_castling_availability'], 'K') && ('wK' != $this->board[4] || 'wR' != $this->board[7])) |
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| 295 | || (\mb_strstr($this->gamestate['fen_castling_availability'], 'Q') && ('wK' != $this->board[4] || 'wR' != $this->board[0])) |
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| 296 | || (\mb_strstr($this->gamestate['fen_castling_availability'], 'k') && ('bK' != $this->board[60] || 'bR' != $this->board[63])) |
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| 297 | || (\mb_strstr($this->gamestate['fen_castling_availability'], 'q') && ('bK' != $this->board[60] || 'bR' != $this->board[56]))) { |
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| 298 | return _MD_CHESS_FENBAD_CA_INCONSISTENT; // castling availability inconsistent with piece placement |
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| 299 | } elseif (('-' != $this->gamestate['fen_en_passant_target_square'] && 3 == $this->gamestate['fen_en_passant_target_square'][1] && 'b' != $this->gamestate['fen_active_color']) |
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| 300 | || ('-' != $this->gamestate['fen_en_passant_target_square'] && 6 == $this->gamestate['fen_en_passant_target_square'][1] && 'w' != $this->gamestate['fen_active_color'])) { |
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| 301 | return _MD_CHESS_FENBAD_EP_COLOR; // en passant target square wrong color |
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| 302 | } elseif ('-' != $this->gamestate['fen_en_passant_target_square'] && 3 == $this->gamestate['fen_en_passant_target_square'][1] |
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| 303 | && 'wP' != $this->board[$this->boardCoordToIndex($this->gamestate['fen_en_passant_target_square'][0] . '4')]) { |
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| 304 | return _MD_CHESS_FENBAD_EP_NO_PAWN; // en passant target square for nonexistent pawn |
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| 305 | } elseif ('-' != $this->gamestate['fen_en_passant_target_square'] && 6 == $this->gamestate['fen_en_passant_target_square'][1] |
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| 306 | && 'bP' != $this->board[$this->boardCoordToIndex($this->gamestate['fen_en_passant_target_square'][0] . '5')]) { |
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| 307 | return _MD_CHESS_FENBAD_EP_NO_PAWN; // en passant target square for nonexistent pawn |
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| 308 | } |
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| 309 | |||
| 310 | #echo "In " . __CLASS__ . '::' . __FUNCTION__ . "\n";#*#DEBUG# |
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| 311 | |||
| 312 | #var_dump('gamestate', $this->gamestate);#*#DEBUG# |
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| 313 | |||
| 314 | return ''; // successful |
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| 315 | } |
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| 316 | |||
| 317 | /** |
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| 318 | * Check whether a path is blocked. |
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| 319 | * |
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| 320 | * check a series of tiles given a start, an end tile |
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| 321 | * which is not included to the check and a position |
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| 322 | * change for each iteration. return true if not blocked. |
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| 323 | * all values are given for 1dim board. |
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| 324 | * |
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| 325 | * @param int $start |
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| 326 | * @param int $end |
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| 327 | * @param int $change |
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| 328 | * @return bool |
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| 329 | * |
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| 330 | * @access private |
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| 331 | */ |
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| 332 | public function pathIsNotBlocked($start, $end, $change) |
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| 333 | { |
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| 334 | for ($pos = $start; $pos != $end; $pos += $change) { |
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| 335 | #echo "path: $pos: '$this->board[$pos]' "; #*#DEBUG# |
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| 336 | |||
| 337 | if (!$this->is_empty_tile($pos)) { |
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| 338 | return false; |
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| 339 | } |
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| 340 | } |
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| 341 | |||
| 342 | return true; |
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| 343 | } |
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| 344 | |||
| 345 | /** |
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| 346 | * Get path. |
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| 347 | * |
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| 348 | * get the empty tiles between start and end as an 1dim array. |
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| 349 | * whether the path is clear is not checked. |
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| 350 | * |
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| 351 | * @param int $start |
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| 352 | * @param int $end |
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| 353 | * @param int $change |
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| 354 | * @return array |
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| 355 | * |
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| 356 | * @access private |
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| 357 | */ |
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| 358 | public function getPath($start, $end, $change) |
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| 359 | { |
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| 360 | $path = []; |
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| 361 | |||
| 362 | for ($pos = $start; $pos != $end; $pos += $change) { |
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| 363 | $path[] = $pos; |
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| 364 | } |
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| 365 | |||
| 366 | return $path; |
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| 367 | } |
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| 368 | |||
| 369 | /** |
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| 370 | * get path change |
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| 371 | * |
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| 372 | * get the change value that must be added to create |
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| 373 | * the 1dim path for figure moving from fig_pos to |
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| 374 | * dest_pos. it is assumed that the movement is valid! |
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| 375 | * no additional checks as in tileIsReachable are |
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| 376 | * performed. rook, queen and bishop are the only |
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| 377 | * units that can have empty tiles in between. |
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| 378 | * |
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| 379 | * @param string $fig |
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| 380 | * @param int $fig_pos |
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| 381 | * @param int $dest_pos |
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| 382 | * @return int |
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| 383 | * |
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| 384 | * @access private |
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| 385 | */ |
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| 386 | public function getPathChange($fig, $fig_pos, $dest_pos) |
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| 387 | { |
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| 388 | $change = 0; |
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| 389 | |||
| 390 | $fy = \floor($fig_pos / 8); |
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| 391 | |||
| 392 | $fx = $fig_pos % 8; |
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| 393 | |||
| 394 | $dx = $dest_pos % 8; |
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| 395 | |||
| 396 | $dy = \floor($dest_pos / 8); |
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| 397 | |||
| 398 | switch ($fig) { |
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| 399 | /* bishop */ case 'B': |
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| 400 | $change = $dy < $fy ? -8 : 8; |
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| 401 | $change += $dx < $fx ? -1 : 1; |
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| 402 | break; |
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| 403 | /* rook */ case 'R': |
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| 404 | if ($fx == $dx) { |
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| 405 | $change = $dy < $fy ? -8 : 8; |
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| 406 | } else { |
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| 407 | $change = $dx < $fx ? -1 : 1; |
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| 408 | } |
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| 409 | break; |
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| 410 | /* queen */ case 'Q': |
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| 411 | if (\abs($fx - $dx) == \abs($fy - $dy)) { |
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| 412 | $change = $dy < $fy ? -8 : 8; |
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| 413 | |||
| 414 | $change += $dx < $fx ? -1 : 1; |
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| 415 | } elseif ($fx == $dx) { |
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| 416 | $change = $dy < $fy ? -8 : 8; |
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| 417 | } else { |
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| 418 | $change = $dx < $fx ? -1 : 1; |
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| 419 | } |
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| 420 | break; |
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| 421 | } |
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| 422 | |||
| 423 | return $change; |
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| 424 | } |
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| 425 | |||
| 426 | /** |
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| 427 | * Check whether a tile is reachable. |
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| 428 | * |
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| 429 | * check whether dest_pos is in reach for unit of fig_type |
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| 430 | * at tile fig_pos. it is not checked whether the tile |
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| 431 | * itself is occupied but only the tiles in between. |
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| 432 | * this function does not check pawns. |
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| 433 | * |
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| 434 | * @param string $fig |
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| 435 | * @param int $fig_pos |
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| 436 | * @param int $dest_pos |
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| 437 | * @return bool |
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| 438 | * |
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| 439 | * @access private |
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| 440 | */ |
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| 441 | public function tileIsReachable($fig, $fig_pos, $dest_pos) |
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| 442 | { |
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| 443 | if ($fig_pos == $dest_pos) { |
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| 444 | return; |
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| 445 | } |
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| 446 | |||
| 447 | $result = 0; |
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| 448 | |||
| 449 | $fy = \floor($fig_pos / 8); |
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| 450 | |||
| 451 | $fx = $fig_pos % 8; |
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| 452 | |||
| 453 | $dy = \floor($dest_pos / 8); |
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| 454 | |||
| 455 | $dx = $dest_pos % 8; |
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| 456 | |||
| 457 | /* DEBUG: echo "$fx,$fy --> $dx,$dy: "; */ |
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| 458 | |||
| 459 | switch ($fig) { |
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| 460 | /* knight */ case 'N': |
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| 461 | if (1 == \abs($fx - $dx) && 2 == \abs($fy - $dy)) { |
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| 462 | $result = 1; |
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| 463 | } |
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| 464 | if (1 == \abs($fy - $dy) && 2 == \abs($fx - $dx)) { |
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| 465 | $result = 1; |
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| 466 | } |
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| 467 | break; |
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| 468 | /* bishop */ case 'B': |
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| 469 | if (\abs($fx - $dx) != \abs($fy - $dy)) { |
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| 470 | break; |
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| 471 | } |
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| 472 | if ($dy < $fy) { |
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| 473 | $change = -8; |
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| 474 | } else { |
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| 475 | $change = 8; |
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| 476 | } |
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| 477 | if ($dx < $fx) { |
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| 478 | --$change; |
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| 479 | } else { |
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| 480 | ++$change; |
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| 481 | } |
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| 482 | if ($this->pathIsNotBlocked($fig_pos + $change, $dest_pos, $change)) { |
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| 483 | $result = 1; |
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| 484 | } |
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| 485 | break; |
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| 486 | /* rook */ case 'R': |
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| 487 | if ($fx != $dx && $fy != $dy) { |
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| 488 | break; |
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| 489 | } |
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| 490 | if ($fx == $dx) { |
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| 491 | if ($dy < $fy) { |
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| 492 | $change = -8; |
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| 493 | } else { |
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| 494 | $change = 8; |
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| 495 | } |
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| 496 | } else { |
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| 497 | if ($dx < $fx) { |
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| 498 | $change = -1; |
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| 499 | } else { |
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| 500 | $change = 1; |
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| 501 | } |
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| 502 | } |
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| 503 | if ($this->pathIsNotBlocked($fig_pos + $change, $dest_pos, $change)) { |
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| 504 | $result = 1; |
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| 505 | } |
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| 506 | break; |
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| 507 | /* queen */ case 'Q': |
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| 508 | if (\abs($fx - $dx) != \abs($fy - $dy) && $fx != $dx && $fy != $dy) { |
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| 509 | break; |
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| 510 | } |
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| 511 | if (\abs($fx - $dx) == \abs($fy - $dy)) { |
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| 512 | if ($dy < $fy) { |
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| 513 | $change = -8; |
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| 514 | } else { |
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| 515 | $change = 8; |
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| 516 | } |
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| 517 | |||
| 518 | if ($dx < $fx) { |
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| 519 | --$change; |
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| 520 | } else { |
||
| 521 | ++$change; |
||
| 522 | } |
||
| 523 | } elseif ($fx == $dx) { |
||
| 524 | if ($dy < $fy) { |
||
| 525 | $change = -8; |
||
| 526 | } else { |
||
| 527 | $change = 8; |
||
| 528 | } |
||
| 529 | } else { |
||
| 530 | if ($dx < $fx) { |
||
| 531 | $change = -1; |
||
| 532 | } else { |
||
| 533 | $change = 1; |
||
| 534 | } |
||
| 535 | } |
||
| 536 | if ($this->pathIsNotBlocked($fig_pos + $change, $dest_pos, $change)) { |
||
| 537 | $result = 1; |
||
| 538 | } |
||
| 539 | break; |
||
| 540 | /* king */ case 'K': |
||
| 541 | if (\abs($fx - $dx) > 1 || \abs($fy - $dy) > 1) { |
||
| 542 | break; |
||
| 543 | } |
||
| 544 | $kings = 0; |
||
| 545 | $adj_tiles = $this->getAdjTiles($dest_pos); |
||
| 546 | foreach ($adj_tiles as $tile) { |
||
| 547 | if ('K' == $this->board[$tile][1]) { |
||
| 548 | $kings++; |
||
| 549 | } |
||
| 550 | } |
||
| 551 | if (2 == $kings) { |
||
| 552 | break; |
||
| 553 | } |
||
| 554 | $result = 1; |
||
| 555 | break; |
||
| 556 | } |
||
| 557 | |||
| 558 | /* DEBUG: echo " $result<br>"; */ |
||
| 559 | |||
| 560 | return $result; |
||
| 561 | } |
||
| 562 | |||
| 563 | /** |
||
| 564 | * Check whether a pawn can attack a tile. |
||
| 565 | * |
||
| 566 | * @param int $fig_pos Position of pawn |
||
| 567 | * @param int $dest_pos Tile to check |
||
| 568 | * @return bool True if pawn can attack |
||
| 569 | * |
||
| 570 | * @access private |
||
| 571 | */ |
||
| 572 | public function checkPawnAttack($fig_pos, $dest_pos) |
||
| 573 | { |
||
| 574 | if ('w' == $this->board[$fig_pos][0]) { |
||
| 575 | if ($fig_pos % 8 > 0 && $dest_pos == $fig_pos + 7) { |
||
| 576 | return true; |
||
| 577 | } |
||
| 578 | |||
| 579 | if ($fig_pos % 8 < 7 && $dest_pos == $fig_pos + 9) { |
||
| 580 | return true; |
||
| 581 | } |
||
| 582 | } elseif ('b' == $this->board[$fig_pos][0]) { |
||
| 583 | if ($fig_pos % 8 < 7 && $dest_pos == $fig_pos - 7) { |
||
| 584 | return true; |
||
| 585 | } |
||
| 586 | |||
| 587 | if ($fig_pos % 8 > 0 && $dest_pos == $fig_pos - 9) { |
||
| 588 | return true; |
||
| 589 | } |
||
| 590 | } |
||
| 591 | |||
| 592 | return false; |
||
| 593 | } |
||
| 594 | |||
| 595 | /** |
||
| 596 | * Check whether a pawn move is legal. |
||
| 597 | * |
||
| 598 | * check whether pawn at figpos may move to destpos. |
||
| 599 | * first move may be two tiles instead of just one. |
||
| 600 | * again the last tile is not checked but just the path |
||
| 601 | * in between. |
||
| 602 | * |
||
| 603 | * @param int $fig_pos Position of pawn. |
||
| 604 | * @param int $dest_pos Destination tile. |
||
| 605 | * @return bool True if move is legal |
||
| 606 | * |
||
| 607 | * @access private |
||
| 608 | */ |
||
| 609 | public function checkPawnMove($fig_pos, $dest_pos) |
||
| 610 | { |
||
| 611 | $first_move = 0; |
||
| 612 | |||
| 613 | if ('w' == $this->board[$fig_pos][0]) { |
||
| 614 | if ($fig_pos >= 8 && $fig_pos <= 15) { |
||
| 615 | $first_move = 1; |
||
| 616 | } |
||
| 617 | |||
| 618 | if ($dest_pos == $fig_pos + 8) { |
||
| 619 | return true; |
||
| 620 | } |
||
| 621 | |||
| 622 | if ($first_move && ($dest_pos == $fig_pos + 16)) { |
||
| 623 | if ($this->is_empty_tile($fig_pos + 8)) { |
||
| 624 | return true; |
||
| 625 | } |
||
| 626 | } |
||
| 627 | } elseif ('b' == $this->board[$fig_pos][0]) { |
||
| 628 | if ($fig_pos >= 48 && $fig_pos <= 55) { |
||
| 629 | $first_move = 1; |
||
| 630 | } |
||
| 631 | |||
| 632 | if ($dest_pos == $fig_pos - 8) { |
||
| 633 | return true; |
||
| 634 | } |
||
| 635 | |||
| 636 | if ($first_move && ($dest_pos == $fig_pos - 16)) { |
||
| 637 | if ($this->is_empty_tile($fig_pos - 8)) { |
||
| 638 | return true; |
||
| 639 | } |
||
| 640 | } |
||
| 641 | } |
||
| 642 | |||
| 643 | return false; |
||
| 644 | } |
||
| 645 | |||
| 646 | /** |
||
| 647 | * Check whether a tile is under attack by the specified player. |
||
| 648 | * |
||
| 649 | * @param string $opp Attacking color ('w' or 'b') |
||
| 650 | * @param int $dest_pos Tile to check |
||
| 651 | * @return bool |
||
| 652 | * |
||
| 653 | * @access private |
||
| 654 | */ |
||
| 655 | public function tileIsUnderAttack($opp, $dest_pos) |
||
| 656 | { |
||
| 657 | #var_dump('tileIsUnderAttack, opp', $opp, 'dest_pos', $dest_pos, 'board', $board);#*#DEBUG# |
||
| 658 | |||
| 659 | for ($i = 0; $i < 64; $i++) { |
||
| 660 | if ($this->board[$i][0] == $opp) { |
||
| 661 | if (('P' == $this->board[$i][1] && $this->checkPawnAttack($i, $dest_pos)) |
||
| 662 | || ('P' != $this->board[$i][1] |
||
| 663 | && $this->tileIsReachable($this->board[$i][1], $i, $dest_pos))) { |
||
| 664 | /*DEBUG: echo "attack test: $i: ",$opp,"P<br>"; */ |
||
| 665 | |||
| 666 | return true; |
||
| 667 | } |
||
| 668 | } |
||
| 669 | } |
||
| 670 | |||
| 671 | return false; |
||
| 672 | } |
||
| 673 | |||
| 674 | /** |
||
| 675 | * Check whether a player's king can be attacked by his opponent. |
||
| 676 | * |
||
| 677 | * @param string $player Player's color ('w' or 'b') |
||
| 678 | * @param string $opp Opponent's color ('w' or 'b') |
||
| 679 | * @return bool |
||
| 680 | * |
||
| 681 | * @access private |
||
| 682 | */ |
||
| 683 | public function kingIsUnderAttack($player, $opp) |
||
| 684 | { |
||
| 685 | #var_dump('kingIsUnderAttack, player', $player, 'opp', $opp, 'board', $board);#*#DEBUG# |
||
| 686 | |||
| 687 | for ($i = 0; $i < 64; $i++) { |
||
| 688 | if ($this->board[$i][0] == $player && 'K' == $this->board[$i][1]) { |
||
| 689 | $king_pos = $i; |
||
| 690 | |||
| 691 | break; |
||
| 692 | } |
||
| 693 | } |
||
| 694 | |||
| 695 | /*DEBUG: echo "$player king is at $king_pos<br>"; */ |
||
| 696 | |||
| 697 | return $this->tileIsUnderAttack($opp, $king_pos); |
||
| 698 | } |
||
| 699 | |||
| 700 | /** |
||
| 701 | * Check whether player's king is checkmated by his opponent. |
||
| 702 | * |
||
| 703 | * @param string $player Player's color ('w' or 'b') |
||
| 704 | * @param string $opp Opponent's color ('w' or 'b') |
||
| 705 | * @return bool |
||
| 706 | * |
||
| 707 | * @access private |
||
| 708 | */ |
||
| 709 | public function isCheckMate($player, $opp) |
||
| 710 | { |
||
| 711 | for ($i = 0; $i < 64; $i++) { |
||
| 712 | if ($this->board[$i][0] == $player && 'K' == $this->board[$i][1]) { |
||
| 713 | $king_pos = $i; |
||
| 714 | |||
| 715 | $king_x = $i % 8; |
||
| 716 | |||
| 717 | $king_y = \floor($i / 8); |
||
| 718 | |||
| 719 | break; |
||
| 720 | } |
||
| 721 | } |
||
| 722 | |||
| 723 | /* test adjacent tiles while king is temporarly removed */ |
||
| 724 | |||
| 725 | $adj_tiles = $this->getAdjTiles($king_pos); |
||
| 726 | |||
| 727 | $contents = $this->board[$king_pos]; |
||
| 728 | |||
| 729 | $this->clear_tile($king_pos); |
||
| 730 | |||
| 731 | foreach ($adj_tiles as $dest_pos) { |
||
| 732 | if ($this->board[$dest_pos][0] == $player) { |
||
| 733 | continue; |
||
| 734 | } |
||
| 735 | |||
| 736 | if ($this->tileIsUnderAttack($opp, $dest_pos)) { |
||
| 737 | continue; |
||
| 738 | } |
||
| 739 | |||
| 740 | $this->board[$king_pos] = $contents; |
||
| 741 | |||
| 742 | return false; |
||
| 743 | } |
||
| 744 | |||
| 745 | $this->board[$king_pos] = $contents; |
||
| 746 | |||
| 747 | /* DEBUG: echo "King cannot escape by itself! "; */ |
||
| 748 | |||
| 749 | /* get all figures that attack the king */ |
||
| 750 | |||
| 751 | $attackers = []; |
||
| 752 | |||
| 753 | $count = 0; |
||
| 754 | |||
| 755 | for ($i = 0; $i < 64; $i++) { |
||
| 756 | if ($this->board[$i][0] == $opp) { |
||
| 757 | if (('P' == $this->board[$i][1] && $this->checkPawnAttack($i, $king_pos)) |
||
| 758 | || ('P' != $this->board[$i][1] |
||
| 759 | && $this->tileIsReachable($this->board[$i][1], $i, $king_pos))) { |
||
| 760 | $attackers[$count++] = $i; |
||
| 761 | } |
||
| 762 | } |
||
| 763 | } |
||
| 764 | |||
| 765 | /* DEBUG: |
||
| 766 | for( $i = 0; $i < $count; $i++ ) |
||
| 767 | echo "Attacker: $attackers[$i] "; |
||
| 768 | echo "Attackercount: ",count($attackers), " "; */ |
||
| 769 | |||
| 770 | /* if more than one there is no chance to escape */ |
||
| 771 | |||
| 772 | if ($count > 1) { |
||
| 773 | return true; |
||
| 774 | } |
||
| 775 | |||
| 776 | /* check whether attacker can be killed by own figure */ |
||
| 777 | |||
| 778 | $dest_pos = $attackers[0]; |
||
| 779 | |||
| 780 | for ($i = 0; $i < 64; $i++) { |
||
| 781 | if ($this->board[$i][0] == $player) { |
||
| 782 | if (('P' == $this->board[$i][1] && $this->checkPawnAttack($i, $dest_pos)) |
||
| 783 | || ('P' != $this->board[$i][1] && 'K' != $this->board[$i][1] |
||
| 784 | && $this->tileIsReachable($this->board[$i][1], $i, $dest_pos)) |
||
| 785 | || ('K' == $this->board[$i][1] |
||
| 786 | && $this->tileIsReachable($this->board[$i][1], $i, $dest_pos) |
||
| 787 | && !$this->tileIsUnderAttack($opp, $dest_pos))) { |
||
| 788 | /* DEBUG: echo "candidate: $i "; */ |
||
| 789 | |||
| 790 | $can_kill_atk = 0; |
||
| 791 | |||
| 792 | $contents_def = $this->board[$i]; |
||
| 793 | |||
| 794 | $contents_atk = $this->board[$dest_pos]; |
||
| 795 | |||
| 796 | $this->board[$dest_pos] = $this->board[$i]; |
||
| 797 | |||
| 798 | $this->clear_tile($i); |
||
| 799 | |||
| 800 | if (!$this->tileIsUnderAttack($opp, $king_pos)) { |
||
| 801 | $can_kill_atk = 1; |
||
| 802 | } |
||
| 803 | |||
| 804 | $this->board[$i] = $contents_def; |
||
| 805 | |||
| 806 | $this->board[$dest_pos] = $contents_atk; |
||
| 807 | |||
| 808 | if ($can_kill_atk) { |
||
| 809 | /* DEBUG: echo "$i can kill attacker"; */ |
||
| 810 | |||
| 811 | return false; |
||
| 812 | } |
||
| 813 | } |
||
| 814 | } |
||
| 815 | } |
||
| 816 | |||
| 817 | /* check whether own unit can block the way */ |
||
| 818 | |||
| 819 | /* if attacking unit is a knight there |
||
| 820 | * is no way to block the path */ |
||
| 821 | |||
| 822 | if ('N' == $this->board[$dest_pos][1]) { |
||
| 823 | return true; |
||
| 824 | } |
||
| 825 | |||
| 826 | /* if enemy is adjacent to king there is no |
||
| 827 | * way either */ |
||
| 828 | |||
| 829 | $dest_x = $dest_pos % 8; |
||
| 830 | |||
| 831 | $dest_y = \floor($dest_pos / 8); |
||
| 832 | |||
| 833 | if (\abs($dest_x - $king_x) <= 1 && \abs($dest_y - $king_y) <= 1) { |
||
| 834 | return true; |
||
| 835 | } |
||
| 836 | |||
| 837 | /* get the list of tiles between king and attacking |
||
| 838 | * unit that can be blocked to stop the attack */ |
||
| 839 | |||
| 840 | $change = $this->getPathChange($this->board[$dest_pos][1], $dest_pos, $king_pos); |
||
| 841 | |||
| 842 | /* DEBUG: echo "path change: $change "; */ |
||
| 843 | |||
| 844 | $path = $this->getPath($dest_pos + $change, $king_pos, $change); |
||
| 845 | |||
| 846 | /* DEBUG: foreach( $path as $tile ) echo "tile: $tile "; */ |
||
| 847 | |||
| 848 | foreach ($path as $pos) { |
||
| 849 | for ($i = 0; $i < 64; $i++) { |
||
| 850 | if ($this->board[$i][0] == $player) { |
||
| 851 | if (('P' == $this->board[$i][1] && $this->checkPawnMove($i, $pos)) |
||
| 852 | || ('P' != $this->board[$i][1] && 'K' != $this->board[$i][1] |
||
| 853 | && $this->tileIsReachable($this->board[$i][1], $i, $pos))) { |
||
| 854 | /* DEBUG: echo "$i can block "; */ |
||
| 855 | |||
| 856 | return false; |
||
| 857 | } |
||
| 858 | } |
||
| 859 | } |
||
| 860 | } |
||
| 861 | |||
| 862 | return true; |
||
| 863 | } |
||
| 864 | |||
| 865 | /** |
||
| 866 | * Check whether player is stalemated. |
||
| 867 | * |
||
| 868 | * @param string $player Color of player who has the move ('w' or 'b') |
||
| 869 | * @param string $opp Opponent's color ('w' or 'b') |
||
| 870 | * @return bool |
||
| 871 | * |
||
| 872 | * @todo recognize when move is not possible because of check |
||
| 873 | * |
||
| 874 | * @access private |
||
| 875 | */ |
||
| 876 | public function isStaleMate($player, $opp) |
||
| 877 | { |
||
| 878 | for ($i = 0; $i < 64; $i++) { |
||
| 879 | if ($this->board[$i][0] == $player) { |
||
| 880 | switch ($this->board[$i][1]) { |
||
| 881 | case 'K': |
||
| 882 | $adj_tiles = $this->getAdjTiles($i); |
||
| 883 | foreach ($adj_tiles as $pos) { |
||
| 884 | if ($this->board[$pos][0] == $player) { |
||
| 885 | continue; |
||
| 886 | } |
||
| 887 | |||
| 888 | if ($this->tileIsUnderAttack($opp, $pos)) { |
||
| 889 | continue; |
||
| 890 | } |
||
| 891 | |||
| 892 | return false; |
||
| 893 | } |
||
| 894 | /* DEBUG: echo "King cannot escape by itself! "; */ |
||
| 895 | break; |
||
| 896 | case 'P': |
||
| 897 | if ('w' == $player) { |
||
| 898 | if ($this->is_empty_tile($i + 8)) { |
||
| 899 | return false; |
||
| 900 | } |
||
| 901 | |||
| 902 | if ($i % 8 > 0 && $this->board[$i + 7][0] != $player) { |
||
| 903 | return false; |
||
| 904 | } |
||
| 905 | |||
| 906 | if ($i % 8 < 7 && $this->board[$i + 9][0] != $player) { |
||
| 907 | return false; |
||
| 908 | } |
||
| 909 | } else { |
||
| 910 | if ($this->is_empty_tile($i - 8)) { |
||
| 911 | return false; |
||
| 912 | } |
||
| 913 | |||
| 914 | if ($i % 8 > 0 && $this->board[$i - 9][0] != $player) { |
||
| 915 | return false; |
||
| 916 | } |
||
| 917 | |||
| 918 | if ($i % 8 < 7 && $this->board[$i - 7][0] != $player) { |
||
| 919 | return false; |
||
| 920 | } |
||
| 921 | } |
||
| 922 | break; |
||
| 923 | case 'B': |
||
| 924 | if ($i - 9 >= 0 && $this->board[$i - 9][0] != $player) { |
||
| 925 | return false; |
||
| 926 | } |
||
| 927 | if ($i - 7 >= 0 && $this->board[$i - 7][0] != $player) { |
||
| 928 | return false; |
||
| 929 | } |
||
| 930 | if ($i + 9 <= 63 && $this->board[$i + 9][0] != $player) { |
||
| 931 | return false; |
||
| 932 | } |
||
| 933 | if ($i + 7 <= 63 && $this->board[$i + 7][0] != $player) { |
||
| 934 | return false; |
||
| 935 | } |
||
| 936 | break; |
||
| 937 | case 'R': |
||
| 938 | if ($i - 8 >= 0 && $this->board[$i - 8][0] != $player) { |
||
| 939 | return false; |
||
| 940 | } |
||
| 941 | if ($i - 1 >= 0 && $this->board[$i - 1][0] != $player) { |
||
| 942 | return false; |
||
| 943 | } |
||
| 944 | if ($i + 8 <= 63 && $this->board[$i + 8][0] != $player) { |
||
| 945 | return false; |
||
| 946 | } |
||
| 947 | if ($i + 1 <= 63 && $this->board[$i + 1][0] != $player) { |
||
| 948 | return false; |
||
| 949 | } |
||
| 950 | break; |
||
| 951 | case 'Q': |
||
| 952 | $adj_tiles = $this->getAdjTiles($i); |
||
| 953 | foreach ($adj_tiles as $pos) { |
||
| 954 | if ($this->board[$pos][0] != $player) { |
||
| 955 | return false; |
||
| 956 | } |
||
| 957 | } |
||
| 958 | break; |
||
| 959 | case 'N': |
||
| 960 | if ($i - 17 >= 0 && $this->board[$i - 17][0] != $player) { |
||
| 961 | return false; |
||
| 962 | } |
||
| 963 | if ($i - 15 >= 0 && $this->board[$i - 15][0] != $player) { |
||
| 964 | return false; |
||
| 965 | } |
||
| 966 | if ($i - 6 >= 0 && $this->board[$i - 6][0] != $player) { |
||
| 967 | return false; |
||
| 968 | } |
||
| 969 | if ($i + 10 <= 63 && $this->board[$i + 10][0] != $player) { |
||
| 970 | return false; |
||
| 971 | } |
||
| 972 | if ($i + 17 <= 63 && $this->board[$i + 17][0] != $player) { |
||
| 973 | return false; |
||
| 974 | } |
||
| 975 | if ($i + 15 <= 63 && $this->board[$i + 15][0] != $player) { |
||
| 976 | return false; |
||
| 977 | } |
||
| 978 | if ($i + 6 <= 63 && $this->board[$i + 6][0] != $player) { |
||
| 979 | return false; |
||
| 980 | } |
||
| 981 | if ($i - 10 >= 0 && $this->board[$i - 10][0] != $player) { |
||
| 982 | return false; |
||
| 983 | } |
||
| 984 | break; |
||
| 985 | } |
||
| 986 | } |
||
| 987 | } |
||
| 988 | |||
| 989 | return true; |
||
| 990 | } |
||
| 991 | |||
| 992 | /** |
||
| 993 | * Generate informational text message with parameters. |
||
| 994 | * |
||
| 995 | * Example: |
||
| 996 | * <pre> |
||
| 997 | * echo move_msg('cannot find {$param[1]} pawn in column {$param[2]}', 'b', 'e'); |
||
| 998 | * - prints: "cannot find b pawn in column e" |
||
| 999 | * </pre> |
||
| 1000 | * |
||
| 1001 | * @param string $text |
||
| 1002 | * @return string |
||
| 1003 | * |
||
| 1004 | * @access private |
||
| 1005 | */ |
||
| 1006 | public function move_msg($text) |
||
| 1007 | { |
||
| 1008 | $param = \func_get_args(); |
||
| 1009 | |||
| 1010 | #var_dump('move_msg, text', $text, 'param', $param);#*#DEBUG# |
||
| 1011 | |||
| 1012 | return eval("return \"$text\";"); |
||
| 1013 | } |
||
| 1014 | |||
| 1015 | /** |
||
| 1016 | * Translate Standard Algebraic Notation (SAN) into a full move description. |
||
| 1017 | * |
||
| 1018 | * The completed move is placed in $this->ac_move. |
||
| 1019 | * |
||
| 1020 | * @param string $player 'w' or 'b' |
||
| 1021 | * @param string $move |
||
| 1022 | * <pre> |
||
| 1023 | * [a-h][1-8|a-h][RNBQK] pawn move/attack |
||
| 1024 | * [PRNBQK][a-h][1-8] figure move |
||
| 1025 | * [PRNBQK][:x][a-h][1-8] figure attack |
||
| 1026 | * [PRNBQK][1-8|a-h][a-h][1-8] ambigous figure move |
||
| 1027 | * [a-h][:x][a-h][1-8][[RNBQK] ambigous pawn attack |
||
| 1028 | * [PRNBQK][1-8|a-h][:x][a-h][1-8] ambigous figure attack |
||
| 1029 | * </pre> |
||
| 1030 | * @return string Empty string if successful, otherwise error message |
||
| 1031 | * |
||
| 1032 | * @access private |
||
| 1033 | */ |
||
| 1034 | public function completeMove($player, $move) |
||
| 1035 | { |
||
| 1036 | /* |
||
| 1037 | * [a-h][1-8|a-h][RNBQK] pawn move/attack |
||
| 1038 | * [PRNBQK][a-h][1-8] figure move |
||
| 1039 | * [PRNBQK][:x][a-h][1-8] figure attack |
||
| 1040 | * [PRNBQK][1-8|a-h][a-h][1-8] ambigous figure move |
||
| 1041 | * [a-h][:x][a-h][1-8][[RNBQK] ambigous pawn attack |
||
| 1042 | * [PRNBQK][1-8|a-h][:x][a-h][1-8] ambigous figure attack |
||
| 1043 | */ |
||
| 1044 | |||
| 1045 | $error = _MD_CHESS_MOVE_UNKNOWN; // "format is totally unknown!" |
||
| 1046 | |||
| 1047 | $this->ac_move = $move; |
||
| 1048 | |||
| 1049 | if (\mb_strlen($move) >= 6) { |
||
| 1050 | /* full move: a pawn requires a ? in the end |
||
| 1051 | * to automatically choose a queen on last line */ |
||
| 1052 | |||
| 1053 | if (0 === \strpos($move, 'P')) { |
||
| 1054 | if ($move[\mb_strlen($move) - 1] < 'A' || $move[\mb_strlen($move) - 1] > 'Z') { |
||
| 1055 | $this->ac_move = "$move?"; |
||
| 1056 | } |
||
| 1057 | } |
||
| 1058 | |||
| 1059 | return ''; |
||
| 1060 | } |
||
| 1061 | |||
| 1062 | /* allow last letter to be a capital one indicating |
||
| 1063 | * the chessmen a pawn is supposed to transform into, |
||
| 1064 | * when entering the last file. we split this character |
||
| 1065 | * to keep the autocompletion process the same. */ |
||
| 1066 | |||
| 1067 | $pawn_upg = '?'; |
||
| 1068 | |||
| 1069 | if ($move[\mb_strlen($move) - 1] >= 'A' && $move[\mb_strlen($move) - 1] <= 'Z') { |
||
| 1070 | $pawn_upg = $move[\mb_strlen($move) - 1]; |
||
| 1071 | |||
| 1072 | $move = \mb_substr($move, 0, -1); |
||
| 1073 | } |
||
| 1074 | |||
| 1075 | // remove trailing '=', if present |
||
| 1076 | |||
| 1077 | if ('=' == $move[mb_strlen($move) - 1]) { |
||
| 1078 | $move = \mb_substr($move, 0, -1); |
||
| 1079 | } |
||
| 1080 | |||
| 1081 | if ('P' == $pawn_upg || 'K' == $pawn_upg) { |
||
| 1082 | return _MD_CHESS_MOVE_PAWN_MAY_BECOME; |
||
| 1083 | } // "A pawn may only become either a knight, a bishop, a rook or a queen!" |
||
| 1084 | |||
| 1085 | if ($move[0] >= 'a' && $move[0] <= 'h') { |
||
| 1086 | /* pawn move. either it's 2 or for characters as |
||
| 1087 | * listed above */ |
||
| 1088 | |||
| 1089 | if (4 == mb_strlen($move)) { |
||
| 1090 | if ('x' != $move[1]) { |
||
| 1091 | return _MD_CHESS_MOVE_USE_X; |
||
| 1092 | } // "use x to indicate an attack" |
||
| 1093 | |||
| 1094 | $dest_x = $move[2]; |
||
| 1095 | |||
| 1096 | $dest_y = $move[3]; |
||
| 1097 | |||
| 1098 | $src_x = $move[0]; |
||
| 1099 | |||
| 1100 | if ('w' == $player) { |
||
| 1101 | $src_y = $dest_y - 1; |
||
| 1102 | } else { |
||
| 1103 | $src_y = $dest_y + 1; |
||
| 1104 | } |
||
| 1105 | |||
| 1106 | $this->ac_move = \sprintf( |
||
| 1107 | 'P%s%dx%s%d%s', |
||
| 1108 | $src_x, |
||
| 1109 | $src_y, |
||
| 1110 | $dest_x, |
||
| 1111 | $dest_y, |
||
| 1112 | $pawn_upg |
||
| 1113 | ); |
||
| 1114 | |||
| 1115 | return ''; |
||
| 1116 | } elseif (2 == mb_strlen($move)) { |
||
| 1117 | $fig = \sprintf('%sP', $player); |
||
| 1118 | |||
| 1119 | if ($move[1] >= '1' && $move[1] <= '8') { |
||
| 1120 | /* pawn move */ |
||
| 1121 | |||
| 1122 | $pos = $this->boardCoordToIndex($move); |
||
| 1123 | |||
| 1124 | if (64 == $pos) { |
||
| 1125 | return $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $move); |
||
| 1126 | } // "coordinate $move is invalid" |
||
| 1127 | |||
| 1128 | if ('w' == $player) { |
||
| 1129 | while ($pos >= 0 && $this->board[$pos] != $fig) { |
||
| 1130 | $pos -= 8; |
||
| 1131 | } |
||
| 1132 | |||
| 1133 | if ($pos < 0) { |
||
| 1134 | $not_found = 1; |
||
| 1135 | } |
||
| 1136 | } else { |
||
| 1137 | while ($pos <= 63 && $this->board[$pos] != $fig) { |
||
| 1138 | $pos += 8; |
||
| 1139 | } |
||
| 1140 | |||
| 1141 | if ($pos > 63) { |
||
| 1142 | $not_found = 1; |
||
| 1143 | } |
||
| 1144 | } |
||
| 1145 | |||
| 1146 | $pos = $this->boardIndexToCoord($pos); |
||
| 1147 | |||
| 1148 | if ((isset($not_found) && $not_found) || '' == $pos) { |
||
| 1149 | return $this->move_msg(_MD_CHESS_MOVE_CANNOT_FIND_PAWN, $player, $move[0]); // "cannot find $player pawn in column $move[0]" |
||
| 1150 | } |
||
| 1151 | |||
| 1152 | $this->ac_move = \sprintf('P%s-%s%s', $pos, $move, $pawn_upg); |
||
| 1153 | |||
| 1154 | return ''; |
||
| 1155 | } |
||
| 1156 | |||
| 1157 | /* notation: [a-h][a-h] for pawn attack no longer allowed |
||
| 1158 | * except for history browser */ |
||
| 1159 | |||
| 1160 | if (0 == $this->browsing_mode) { |
||
| 1161 | return _MD_CHESS_MOVE_USE_NOTATION; |
||
| 1162 | } // "please use denotation [a-h]x[a-h][1-8] for pawn attacks (see help for more information)" |
||
| 1163 | |||
| 1164 | /* pawn attack must be only one pawn in column! */ |
||
| 1165 | |||
| 1166 | $pawns = 0; |
||
| 1167 | |||
| 1168 | $start = $this->boardCoordToIndex(\sprintf('%s1', $move[0])); |
||
| 1169 | |||
| 1170 | if (64 == $start) { |
||
| 1171 | return $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $move[0]); |
||
| 1172 | } // "coordinate $move[0] is invalid" |
||
| 1173 | |||
| 1174 | for ($i = 1; $i <= 8; $i++, $start += 8) { |
||
| 1175 | if ($this->board[$start] == $fig) { |
||
| 1176 | $pawns++; |
||
| 1177 | |||
| 1178 | $pawn_line = $i; |
||
| 1179 | } |
||
| 1180 | } |
||
| 1181 | |||
| 1182 | if (0 == $pawns) { |
||
| 1183 | return $this->move_msg(_MD_CHESS_MOVE_NO_PAWN, $move[0]); |
||
| 1184 | } // "there is no pawn in column $move[0]" |
||
| 1185 | |||
| 1186 | elseif ($pawns > 1) { |
||
| 1187 | return $this->move_msg(_MD_CHESS_MOVE_TWO_PAWNS, $move[0]); |
||
| 1188 | } // "there is more than one pawn in column $move[0]" |
||
| 1189 | |||
| 1190 | if ('w' == $player) { |
||
| 1191 | $dest_line = $pawn_line + 1; |
||
| 1192 | } else { |
||
| 1193 | $dest_line = $pawn_line - 1; |
||
| 1194 | } |
||
| 1195 | |||
| 1196 | $this->ac_move = \sprintf( |
||
| 1197 | 'P%s%dx%s%d', |
||
| 1198 | $move[0], |
||
| 1199 | $pawn_line, |
||
| 1200 | $move[1], |
||
| 1201 | $dest_line |
||
| 1202 | ); |
||
| 1203 | |||
| 1204 | return ''; |
||
| 1205 | } |
||
| 1206 | } else { |
||
| 1207 | /* figure move */ |
||
| 1208 | |||
| 1209 | $dest_coord = \mb_substr($move, \mb_strlen($move) - 2, 2); |
||
| 1210 | |||
| 1211 | $action = $move[\mb_strlen($move) - 3]; |
||
| 1212 | |||
| 1213 | if ('x' != $action) { |
||
| 1214 | $action = '-'; |
||
| 1215 | } |
||
| 1216 | |||
| 1217 | if ('w' == $player) { |
||
| 1218 | $figures = $this->w_figures; |
||
| 1219 | } else { |
||
| 1220 | $figures = $this->b_figures; |
||
| 1221 | } |
||
| 1222 | |||
| 1223 | $fig_count = 0; |
||
| 1224 | |||
| 1225 | foreach ($figures as $figure) { |
||
| 1226 | if ($figure[0] == $move[0]) { |
||
| 1227 | $fig_count++; |
||
| 1228 | |||
| 1229 | if (1 == $fig_count) { |
||
| 1230 | $pos1 = \mb_substr($figure, 1, 2); |
||
| 1231 | } else { |
||
| 1232 | $pos2 = \mb_substr($figure, 1, 2); |
||
| 1233 | } |
||
| 1234 | } |
||
| 1235 | } |
||
| 1236 | |||
| 1237 | if (0 == $fig_count) { |
||
| 1238 | return $this->move_msg(_MD_CHESS_MOVE_NO_FIGURE, $move[0], $this->getFullFigureName($move[0])); |
||
| 1239 | } // sprintf("there is no figure %s = %s", $move[0], $this->getFullFigureName($move[0])) |
||
| 1240 | |||
| 1241 | elseif (1 == $fig_count) { |
||
| 1242 | $this->ac_move = \sprintf( |
||
| 1243 | '%s%s%s%s', |
||
| 1244 | $move[0], |
||
| 1245 | $pos1, |
||
| 1246 | $action, |
||
| 1247 | $dest_coord |
||
| 1248 | ); |
||
| 1249 | |||
| 1250 | return ''; |
||
| 1251 | } |
||
| 1252 | |||
| 1253 | /* two figures which may cause ambiguity */ |
||
| 1254 | |||
| 1255 | $dest_pos = $this->boardCoordToIndex($dest_coord); |
||
| 1256 | |||
| 1257 | if (64 == $dest_pos) { |
||
| 1258 | return $this->move_msg(_MD_CHESS_MOVE_COORD_INVALID, $dest_coord); |
||
| 1259 | } // "coordinate $dest_coord is invalid" |
||
| 1260 | |||
| 1261 | $fig1_can_reach = $this->tileIsReachable( |
||
| 1262 | $move[0], |
||
| 1263 | $this->boardCoordToIndex($pos1), |
||
| 1264 | $dest_pos |
||
| 1265 | ); |
||
| 1266 | |||
| 1267 | $fig2_can_reach = $this->tileIsReachable( |
||
| 1268 | $move[0], |
||
| 1269 | $this->boardCoordToIndex($pos2), |
||
| 1270 | $dest_pos |
||
| 1271 | ); |
||
| 1272 | |||
| 1273 | if (!$fig1_can_reach && !$fig2_can_reach) { |
||
| 1274 | return $this->move_msg(_MD_CHESS_MOVE_NEITHER_CAN_REACH, $move[0], $this->getFullFigureName($move[0]), $dest_coord); |
||
| 1275 | } // sprintf("neither of the %s = %s can reach %s", $move[0], $this->getFullFigureName($move[0]), $dest_coord) |
||
| 1276 | |||
| 1277 | elseif ($fig1_can_reach && $fig2_can_reach) { |
||
| 1278 | /* ambiguity - check whether a hint is given */ |
||
| 1279 | |||
| 1280 | if (('-' == $action && 4 == mb_strlen($move)) |
||
| 1281 | || ('x' == $action && 5 == mb_strlen($move))) { |
||
| 1282 | $hint = $move[1]; |
||
| 1283 | } |
||
| 1284 | |||
| 1285 | if (empty($hint)) { |
||
| 1286 | return $this->move_msg(_MD_CHESS_MOVE_BOTH_CAN_REACH, $move[0], $this->getFullFigureName($move[0]), $dest_coord); |
||
| 1287 | } // sprintf("both of the %s = %s can reach %s", $move[0], $this->getFullFigureName($move[0]), $dest_coord) |
||
| 1288 | |||
| 1289 | $move_fig1 = 0; |
||
| 1290 | |||
| 1291 | $move_fig2 = 0; |
||
| 1292 | |||
| 1293 | if ($hint >= '1' && $hint <= '8') { |
||
| 1294 | if ($pos1[1] == $hint && $pos2[1] != $hint) { |
||
| 1295 | $move_fig1 = 1; |
||
| 1296 | } |
||
| 1297 | |||
| 1298 | if ($pos2[1] == $hint && $pos1[1] != $hint) { |
||
| 1299 | $move_fig2 = 1; |
||
| 1300 | } |
||
| 1301 | } else { |
||
| 1302 | if ($pos1[0] == $hint && $pos2[0] != $hint) { |
||
| 1303 | $move_fig1 = 1; |
||
| 1304 | } |
||
| 1305 | |||
| 1306 | if ($pos2[0] == $hint && $pos1[0] != $hint) { |
||
| 1307 | $move_fig2 = 1; |
||
| 1308 | } |
||
| 1309 | } |
||
| 1310 | |||
| 1311 | if (!$move_fig1 && !$move_fig2) { |
||
| 1312 | return _MD_CHESS_MOVE_AMBIGUOUS; |
||
| 1313 | } // "ambiguity is not properly resolved" |
||
| 1314 | |||
| 1315 | if ($move_fig1) { |
||
| 1316 | $this->ac_move = \sprintf( |
||
| 1317 | '%s%s%s%s', |
||
| 1318 | $move[0], |
||
| 1319 | $pos1, |
||
| 1320 | $action, |
||
| 1321 | $dest_coord |
||
| 1322 | ); |
||
| 1323 | } else { |
||
| 1324 | $this->ac_move = \sprintf( |
||
| 1325 | '%s%s%s%s', |
||
| 1326 | $move[0], |
||
| 1327 | $pos2, |
||
| 1328 | $action, |
||
| 1329 | $dest_coord |
||
| 1330 | ); |
||
| 1331 | } |
||
| 1332 | |||
| 1333 | return; |
||
| 1334 | } |
||
| 1335 | |||
| 1336 | if ($fig1_can_reach) { |
||
| 1337 | $this->ac_move = \sprintf( |
||
| 1338 | '%s%s%s%s', |
||
| 1339 | $move[0], |
||
| 1340 | $pos1, |
||
| 1341 | $action, |
||
| 1342 | $dest_coord |
||
| 1343 | ); |
||
| 1344 | } else { |
||
| 1345 | $this->ac_move = \sprintf( |
||
| 1346 | '%s%s%s%s', |
||
| 1347 | $move[0], |
||
| 1348 | $pos2, |
||
| 1349 | $action, |
||
| 1350 | $dest_coord |
||
| 1351 | ); |
||
| 1352 | } |
||
| 1353 | |||
| 1354 | return ''; |
||
| 1355 | } |
||
| 1356 | |||
| 1357 | return $error; |
||
| 1358 | } |
||
| 1359 | |||
| 1360 | /** |
||
| 1361 | * A hacky function that uses autocomplete to short |
||
| 1362 | * a full move. if this fails there is no warning |
||
| 1363 | * but the move is kept unchanged. |
||
| 1364 | * |
||
| 1365 | * @param string $player 'w' or 'b' |
||
| 1366 | * @param string $move |
||
| 1367 | * @return string new move |
||
| 1368 | * |
||
| 1369 | * @access private |
||
| 1370 | */ |
||
| 1371 | public function convertFullToChessNotation($player, $move) |
||
| 1372 | { |
||
| 1373 | $new_move = $move; |
||
| 1374 | |||
| 1375 | $old_ac_move = $this->ac_move; /* backup required as autocomplete |
||
| 1376 | will overwrite it */ |
||
| 1377 | |||
| 1378 | /* valid pawn moves are always non-ambigious */ |
||
| 1379 | |||
| 1380 | if (0 === \strpos($move, 'P')) { |
||
| 1381 | /* skip P anycase. for attacks skip source digit |
||
| 1382 | and for moves skip source pos and - */ |
||
| 1383 | |||
| 1384 | if ('-' == $move[3]) { |
||
| 1385 | $new_move = \mb_substr($move, 4); |
||
| 1386 | } elseif ('x' == $move[3]) { |
||
| 1387 | $new_move = \sprintf('%s%s', $move[1], \mb_substr($move, 3)); |
||
| 1388 | } |
||
| 1389 | } else { |
||
| 1390 | /* try to remove the source position and check whether it |
||
| 1391 | * is a non-ambigious move. if it is add one of the components |
||
| 1392 | * and check again */ |
||
| 1393 | |||
| 1394 | if ('-' == $move[3]) { |
||
| 1395 | $dest = \mb_substr($move, 4); |
||
| 1396 | } elseif ('x' == $move[3]) { |
||
| 1397 | $dest = \mb_substr($move, 3); |
||
| 1398 | } |
||
| 1399 | |||
| 1400 | $new_move = \sprintf('%s%s', $move[0], $dest); |
||
| 1401 | |||
| 1402 | if ('' != $this->completeMove($player, $new_move)) { |
||
| 1403 | /* add a component */ |
||
| 1404 | |||
| 1405 | $new_move = \sprintf('%s%s%s', $move[0], $move[1], $dest); |
||
| 1406 | |||
| 1407 | if ('' != $this->completeMove($player, $new_move)) { |
||
| 1408 | /* add other component */ |
||
| 1409 | |||
| 1410 | $new_move = \sprintf('%s%s%s', $move[0], $move[2], $dest); |
||
| 1411 | |||
| 1412 | if ('' != $this->completeMove($player, $new_move)) { |
||
| 1413 | $new_move = $move; |
||
| 1414 | } /* give up */ |
||
| 1415 | } |
||
| 1416 | } |
||
| 1417 | } |
||
| 1418 | |||
| 1419 | $this->ac_move = $old_ac_move; |
||
| 1420 | |||
| 1421 | return $new_move; |
||
| 1422 | } |
||
| 1423 | |||
| 1424 | /** |
||
| 1425 | * Handle a move. |
||
| 1426 | * |
||
| 1427 | * check whether it is user's turn and the move is valid. |
||
| 1428 | * if the move is okay update the game file. |
||
| 1429 | * |
||
| 1430 | * @param string $move |
||
| 1431 | * @return array A two-element array: |
||
| 1432 | * - $move_performed: true if the move was performed and the game state has been updated, false otherwise |
||
| 1433 | * - $move_result_text: text message |
||
| 1434 | * |
||
| 1435 | * @access private |
||
| 1436 | */ |
||
| 1437 | public function handleMove($move) |
||
| 2011 | } |
||
| 2012 | |||
| 2013 | /** |
||
| 2014 | * Check whether a tile is empty. |
||
| 2015 | * |
||
| 2016 | * @param int $position |
||
| 2017 | * @return bool |
||
| 2018 | * |
||
| 2019 | * @access private |
||
| 2020 | */ |
||
| 2021 | public function is_empty_tile($position) |
||
| 2024 | } |
||
| 2025 | |||
| 2026 | /** |
||
| 2027 | * Clear a tile. |
||
| 2028 | * |
||
| 2029 | * @param int $position Position of tile |
||
| 2030 | * |
||
| 2031 | * @access private |
||
| 2032 | */ |
||
| 2033 | public function clear_tile($position) |
||
| 2034 | { |
||
| 2035 | $this->board[$position] = '00'; |
||
| 2036 | } |
||
| 2037 | |||
| 2038 | /** |
||
| 2039 | * Convert FEN piece placement field to array. |
||
| 2040 | * |
||
| 2041 | * Use $this->gamestate['fen_piece_placement'] to initialize $this->board, $this->w_figures and $this->b_figures. |
||
| 2042 | * |
||
| 2043 | * @return bool True if piece placement is valid, otherwise false. |
||
| 2044 | * |
||
| 2045 | * @access private |
||
| 2046 | */ |
||
| 2047 | public function fen_piece_placement_to_board() |
||
| 2048 | { |
||
| 2049 | if (empty($this->gamestate['fen_piece_placement']) || \mb_strlen($this->gamestate['fen_piece_placement']) > 71) { |
||
| 2050 | #trigger_error('piece placement empty or length invalid', E_USER_WARNING); #*#DEBUG# |
||
| 2051 | return false; // invalid length |
||
| 2052 | } |
||
| 2053 | |||
| 2054 | $this->board = []; |
||
| 2055 | |||
| 2056 | $piece_map = [ |
||
| 2057 | 'K' => 'wK', |
||
| 2058 | 'Q' => 'wQ', |
||
| 2059 | 'R' => 'wR', |
||
| 2060 | 'B' => 'wB', |
||
| 2061 | 'N' => 'wN', |
||
| 2062 | 'P' => 'wP', |
||
| 2063 | 'k' => 'bK', |
||
| 2064 | 'q' => 'bQ', |
||
| 2065 | 'r' => 'bR', |
||
| 2066 | 'b' => 'bB', |
||
| 2067 | 'n' => 'bN', |
||
| 2068 | 'p' => 'bP', |
||
| 2069 | ]; |
||
| 2070 | |||
| 2071 | $tiles = \implode('', \array_reverse(\explode('/', $this->gamestate['fen_piece_placement']))); |
||
| 2072 | |||
| 2073 | for ($i = 0, $iMax = mb_strlen($tiles); $i < $iMax; ++$i) { |
||
| 2074 | $tile = $tiles[$i]; |
||
| 2075 | |||
| 2076 | if (isset($piece_map[$tile])) { |
||
| 2077 | $this->board[] = $piece_map[$tile]; |
||
| 2078 | } elseif (\is_numeric($tile) && $tile >= 1 && $tile <= 8) { |
||
| 2079 | for ($j = 0; $j < $tile; ++$j) { |
||
| 2080 | $this->board[] = '00'; |
||
| 2081 | } |
||
| 2082 | } else { |
||
| 2083 | #trigger_error("tile='$tile'", E_USER_WARNING); #*#DEBUG# |
||
| 2084 | return false; // unexpected character in piece_placement |
||
| 2085 | } |
||
| 2086 | } |
||
| 2087 | |||
| 2088 | if (64 != \count($this->board)) { |
||
| 2089 | #trigger_error('count(board)=' . count($this->board), E_USER_WARNING); #*#DEBUG# |
||
| 2090 | return false; // piece_placement has incorrect number of tiles |
||
| 2091 | } |
||
| 2092 | |||
| 2093 | $this->w_figures = []; |
||
| 2094 | |||
| 2095 | $this->b_figures = []; |
||
| 2096 | |||
| 2097 | for ($i = 0; $i < 64; ++$i) { |
||
| 2098 | $tile = $this->board[$i]; |
||
| 2099 | |||
| 2100 | $coordinates = $this->boardIndexToCoord($i); |
||
| 2101 | |||
| 2102 | if ('w' == $tile[0]) { |
||
| 2103 | $this->w_figures[] = $tile[1] . $coordinates; |
||
| 2104 | } elseif ('b' == $tile[0]) { |
||
| 2105 | $this->b_figures[] = $tile[1] . $coordinates; |
||
| 2106 | } |
||
| 2107 | } |
||
| 2108 | |||
| 2109 | return true; |
||
| 2110 | } |
||
| 2111 | |||
| 2112 | /** |
||
| 2113 | * Convert array to FEN piece placement field. |
||
| 2114 | * |
||
| 2115 | * Use $this->board to initialize $this->gamestate['fen_piece_placement']. |
||
| 2116 | * |
||
| 2117 | * @access private |
||
| 2118 | */ |
||
| 2119 | public function board_to_fen_piece_placement() |
||
| 2120 | { |
||
| 2121 | $rows = []; |
||
| 2122 | |||
| 2123 | for ($rank = 7; $rank >= 0; --$rank) { |
||
| 2124 | $row = ''; |
||
| 2125 | |||
| 2126 | for ($file = 0; $file < 8; ++$file) { |
||
| 2127 | $index = 8 * $rank + $file; |
||
| 2128 | |||
| 2129 | if (!$this->is_empty_tile($index)) { |
||
| 2130 | $tile = $this->board[$index]; |
||
| 2131 | |||
| 2132 | $piece = 'w' == $tile[0] ? $tile[1] : \mb_strtolower($tile[1]); // 'K','Q','R','B','N' or 'P' (uppercase for white, lowercase for black) |
||
| 2133 | } else { |
||
| 2134 | $piece = 'x'; // temporarily mark each empty tile with 'x' |
||
| 2135 | } |
||
| 2136 | |||
| 2137 | $row .= $piece; // append piece symbol to row-string |
||
| 2138 | } |
||
| 2139 | |||
| 2140 | $rows[] = $row; |
||
| 2141 | } |
||
| 2142 | |||
| 2143 | // Concatenate the eight row-strings with the separator '/'. |
||
| 2144 | |||
| 2145 | // Then replace each string of x's with the string length. |
||
| 2146 | |||
| 2147 | $this->gamestate['fen_piece_placement'] = \preg_replace_callback('/(x+)/', static function($matches) {return \strlen($matches[1]);}, \implode('/', $rows)); |
||
| 2148 | } |
||
| 2149 | |||
| 2150 | /** |
||
| 2151 | * Determine whether there is insufficient material to mate. |
||
| 2152 | * |
||
| 2153 | * @return bool True if only the following pieces remain: K vs. K, K vs. K+B or K vs. K+N; otherwise false. |
||
| 2154 | * |
||
| 2155 | * @access private |
||
| 2156 | */ |
||
| 2157 | public function insufficient_mating_material() |
||
| 2158 | { |
||
| 2159 | $pieces = \mb_strtoupper($this->gamestate['fen_piece_placement']); |
||
| 2160 | |||
| 2161 | $counts = \count_chars($pieces, 1); |
||
| 2162 | |||
| 2163 | $num_queens = (int)@$counts[\ord('Q')]; |
||
| 2164 | |||
| 2165 | $num_rooks = (int)@$counts[\ord('R')]; |
||
| 2166 | |||
| 2167 | $num_bishops = (int)@$counts[\ord('B')]; |
||
| 2168 | |||
| 2169 | $num_knights = (int)@$counts[\ord('N')]; |
||
| 2170 | |||
| 2171 | $num_pawns = (int)@$counts[\ord('P')]; |
||
| 2172 | |||
| 2173 | return 0 == $num_queens && 0 == $num_rooks && ($num_bishops + $num_knights) <= 1 && 0 == $num_pawns; |
||
| 2174 | } |
||
| 2175 | |||
| 2176 | // -------------------------- |
||
| 2177 | |||
| 2178 | // INCIDENTAL PRIVATE METHODS |
||
| 2179 | |||
| 2180 | // -------------------------- |
||
| 2181 | |||
| 2182 | // These functions don't really need to be class methods, since they don't access class properties. |
||
| 2183 | |||
| 2184 | // They're placed within the class only for name-scoping. |
||
| 2185 | |||
| 2186 | /** |
||
| 2187 | * Convert board coordinates [a-h][1-8] to board index [0..63] |
||
| 2188 | * |
||
| 2189 | * @param string $coord Example: 'b3' |
||
| 2190 | * @return int Example: 17 |
||
| 2191 | * |
||
| 2192 | * @access private |
||
| 2193 | */ |
||
| 2194 | public function boardCoordToIndex($coord) |
||
| 2195 | { |
||
| 2196 | //echo $coord," --> "; |
||
| 2197 | |||
| 2198 | switch ($coord[0]) { |
||
| 2199 | case 'a': |
||
| 2200 | $x = 0; |
||
| 2201 | break; |
||
| 2202 | case 'b': |
||
| 2203 | $x = 1; |
||
| 2204 | break; |
||
| 2205 | case 'c': |
||
| 2206 | $x = 2; |
||
| 2207 | break; |
||
| 2208 | case 'd': |
||
| 2209 | $x = 3; |
||
| 2210 | break; |
||
| 2211 | case 'e': |
||
| 2212 | $x = 4; |
||
| 2213 | break; |
||
| 2214 | case 'f': |
||
| 2215 | $x = 5; |
||
| 2216 | break; |
||
| 2217 | case 'g': |
||
| 2218 | $x = 6; |
||
| 2219 | break; |
||
| 2220 | case 'h': |
||
| 2221 | $x = 7; |
||
| 2222 | break; |
||
| 2223 | default: |
||
| 2224 | return 64; /* erronous coord */ |
||
| 2225 | } |
||
| 2226 | |||
| 2227 | $y = $coord[1] - 1; |
||
| 2228 | |||
| 2229 | if ($y < 0 || $y > 7) { |
||
| 2230 | return 64; |
||
| 2231 | } /* erronous coord */ |
||
| 2232 | |||
| 2233 | return $y * 8 + $x; |
||
| 2234 | //echo "$index | "; |
||
| 2235 | } |
||
| 2236 | |||
| 2237 | /** |
||
| 2238 | * Convert board index [0..63] to board coordinates [a-h][1-8]. |
||
| 2239 | * |
||
| 2240 | * @param int $index Example: 17 |
||
| 2241 | * @return string Example: 'b3' |
||
| 2242 | * |
||
| 2243 | * @access private |
||
| 2244 | */ |
||
| 2245 | public function boardIndexToCoord($index) |
||
| 2246 | { |
||
| 2247 | //echo $index," --> "; |
||
| 2248 | |||
| 2249 | if ($index < 0 || $index > 63) { |
||
| 2250 | return ''; |
||
| 2251 | } |
||
| 2252 | |||
| 2253 | $y = \floor($index / 8) + 1; |
||
| 2254 | |||
| 2255 | $x = \chr(($index % 8) + 97); |
||
| 2256 | |||
| 2257 | return "$x$y"; |
||
| 2258 | } |
||
| 2259 | |||
| 2260 | /** |
||
| 2261 | * Get piece name from piece symbol. |
||
| 2262 | * |
||
| 2263 | * @param string $short Piece symbol |
||
| 2264 | * @return string Piece name |
||
| 2265 | * |
||
| 2266 | * @access private |
||
| 2267 | */ |
||
| 2268 | public function getFullFigureName($short) |
||
| 2280 | } |
||
| 2281 | |||
| 2282 | /** |
||
| 2283 | * Get tiles adjacent to specified tile. |
||
| 2284 | * |
||
| 2285 | * @param int $fig_pos |
||
| 2286 | * @return array |
||
| 2287 | * |
||
| 2288 | * @access private |
||
| 2289 | */ |
||
| 2290 | public function getAdjTiles($fig_pos) |
||
| 2336 | } |
||
| 2337 | } // class ChessGame |
||
| 2338 | |||
| 2339 | ?> |
||
| 2340 |
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