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<?php |
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declare(strict_types=1); |
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namespace App\Crossword\Features\Constructor\Scanner; |
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use App\Crossword\Features\Constructor\Scanner\Grid\Cell; |
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use App\Crossword\Features\Constructor\Scanner\Grid\Coordinate; |
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use App\Crossword\Features\Constructor\Scanner\Grid\Grid; |
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use App\Crossword\Features\Constructor\Scanner\Grid\Row; |
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final class RowXScanner |
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{ |
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/** |
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* @return Row[] |
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*/ |
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public function scan(Grid $grid, int $length): array |
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{ |
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$result = []; |
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foreach ($grid as $cell) { |
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if (!$cell->isLetter()) { |
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continue; |
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} |
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$topLine = $this->doScan($grid, $cell, new Move(Move::TOP), $length); |
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$downLine = $this->doScan($grid, $cell, new Move(Move::DOWN), $length); |
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if (count($topLine) || count($downLine)) { |
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$result[] = new Row(...array_reverse(array_merge(array_reverse($topLine), [$cell], $downLine))); |
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} |
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} |
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return $result; |
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} |
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private function doScan(Grid $grid, Cell $cell, Move $move, int $length): array |
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{ |
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$cell = $this->startCell($grid, $cell, $move); |
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$line = []; |
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for ($counter = 1; $counter <= $length; $counter++) { |
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$coordinate = $cell->coordinate(); |
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if ($cell->isBlack() || !$coordinate->inFrame()) { |
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return $line; |
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} |
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if (!$this->isFitRow($grid, $coordinate)) { |
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return []; |
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} |
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$leftCell = $grid->shiftCell($coordinate->left()); |
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$rightCell = $grid->shiftCell($coordinate->right()); |
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if (!($leftCell->isEmpty() && $rightCell->isEmpty())) { |
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array_pop($line); |
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return $line; |
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} |
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$line[] = $cell; |
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$cell = $this->nextCell($grid, $move, $coordinate); |
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if ($length === $counter && $cell->isLetter()) { |
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array_pop($line); |
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} |
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} |
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return $line; |
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} |
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private function isFitRow(Grid $grid, Coordinate $coordinate): bool |
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{ |
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$topCell = $grid->shiftCell($coordinate->top()); |
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$downCell = $grid->shiftCell($coordinate->down()); |
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if ($topCell->isBlack() && $downCell->isLetter()) { |
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return false; |
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} |
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if ($topCell->letter() && $downCell->isLetter()) { |
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return false; |
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} |
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if ($topCell->letter() && $downCell->isBlack()) { |
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return false; |
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} |
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return true; |
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} |
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private function nextCell(Grid $grid, Move $move, Coordinate $coordinate): Cell |
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{ |
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$topCell = $grid->shiftCell($coordinate->top()); |
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$downCell = $grid->shiftCell($coordinate->down()); |
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return match ((string) $move->getValue()) { |
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Move::TOP => $topCell, |
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Move::DOWN => $downCell, |
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}; |
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} |
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private function startCell(Grid $grid, Cell $cell, Move $move): Cell |
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{ |
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$coordinate = $cell->coordinate(); |
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return match ((string) $move->getValue()) { |
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Move::TOP => $grid->shiftCell($coordinate->top()), |
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Move::DOWN => $grid->shiftCell($coordinate->down()), |
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}; |
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} |
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} |
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dykyi-roman /
crossword
