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<?php declare(strict_types=1);
namespace Stratadox\PuzzleSolver\Solver;
use Stratadox\PuzzleSolver\Puzzle;
use Stratadox\PuzzleSolver\PuzzleSolver;
use Stratadox\PuzzleSolver\PuzzleSolution;
use Stratadox\PuzzleSolver\SearchStrategy\SearchStrategyFactory;
use Stratadox\PuzzleSolver\Solutions;
/**
* Lazy puzzle solvers will continue to look for solutions until they've found
* *all* valid solutions. Lazy solvers can be used for puzzles that require more
* than one solution.
*
* @author Stratadox
*/
final class LazySolver implements PuzzleSolver
{
/** @var SearchStrategyFactory */
private $strategy;
private function __construct(SearchStrategyFactory $strategy)
$this->strategy = $strategy;
}
public static function using(SearchStrategyFactory $strategy): PuzzleSolver
return new self($strategy);
public function solve(Puzzle $puzzle): Solutions
$search = $this->strategy->begin($puzzle);
$solutions = [];
while ($search->isOngoing()) {
$puzzleState = $search->nextCandidate();
if ($puzzleState->isSolved()) {
$solutions[] = PuzzleSolution::fromSolved($puzzleState, $puzzle);
foreach ($puzzleState->possibleMoves() as $move) {
$search->consider($puzzleState->afterMaking($move));
return new Solutions(...$solutions);
Stratadox /
PuzzleSolver
