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<?php declare(strict_types=1);
namespace Stratadox\PuzzleSolver\Puzzle\WolfGoatCabbage;
use Stratadox\PuzzleSolver\Move;
use Stratadox\PuzzleSolver\Moves;
use function array_map;
use function sprintf;
final class Crossing implements Move
{
/** @var bool */
private $towardsGoal;
/** @var Purchase|null */
private $bringAlong;
public function __construct(bool $towardsGoal, ?Purchase $bringAlong)
$this->towardsGoal = $towardsGoal;
$this->bringAlong = $bringAlong;
}
public static function allCrossingsFor(Riverbank $riverbank): Moves
return new Moves(
new Crossing($riverbank->isStart(), null),
...array_map(static function (Purchase $purchase) use ($riverbank) {
return new Crossing($riverbank->isStart(), $purchase);
}, $riverbank->purchases())
);
public function bringAlong(): ?Purchase
return $this->bringAlong;
public function __toString(): string
return sprintf(
'%s with %s',
$this->towardsGoal ? 'forwards' : 'backwards',
$this->bringAlong ?: 'nothing'
Stratadox /
PuzzleSolver
