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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver; |
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use Stratadox\PuzzleSolver\SearchStrategy\BestFirstStrategyFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\BreadthFirstStrategyFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\DebugLoggerFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\DepthFirstStrategyFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\DuplicateNodeSkipperFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\SearchStrategyFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\VisitedNodeCostCheckerFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\VisitedNodeSkipperFactory; |
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use Stratadox\PuzzleSolver\SearchStrategy\WorseThanBestSolutionSkipperFactory; |
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use Stratadox\PuzzleSolver\Solver\EagerSolver; |
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use Stratadox\PuzzleSolver\Solver\LazySolver; |
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/** |
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* Factory for @see PuzzleSolver |
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* |
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* @author Stratadox |
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*/ |
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final class PuzzleSolverFactory implements SolverFactory |
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{ |
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public function forAPuzzleWith( |
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PuzzleDescription $puzzle, |
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SearchSettings $settings |
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): PuzzleSolver { |
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return $puzzle->singleSolution() ? |
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EagerSolver::using($this->add($settings, $this->eagerStrategy($puzzle))) : |
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LazySolver::using($this->add($settings, $this->lazyStrategy($puzzle))); |
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} |
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private function add( |
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SearchSettings $settings, |
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SearchStrategyFactory $strategyFactory |
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): SearchStrategyFactory { |
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if (null === $settings->loggingFile()) { |
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return $strategyFactory; |
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} |
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return DebugLoggerFactory::make( |
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$settings->iterationInterval(), |
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$strategyFactory, |
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$settings->logSeparator(), |
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$settings->loggingFile() |
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); |
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} |
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/** |
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* Retrieves the eagerStrategy, based on the current description. |
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* |
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* @return SearchStrategyFactory |
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* |
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* @todo Add more test puzzles that require a single solution, to challenge |
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* the assumptions currently made. |
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*/ |
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private function eagerStrategy(PuzzleDescription $puzzle): SearchStrategyFactory |
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{ |
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if (null !== $puzzle->heuristic()) { |
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return VisitedNodeCostCheckerFactory::using( |
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BestFirstStrategyFactory::withHeuristic($puzzle->heuristic()) |
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); |
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} |
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if ($puzzle->isWeightedMoves()) { |
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return VisitedNodeCostCheckerFactory::using( |
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BestFirstStrategyFactory::noHeuristic() |
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); |
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} |
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return VisitedNodeSkipperFactory::using( |
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$puzzle->isExhausting() ? |
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DepthFirstStrategyFactory::make() : |
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BreadthFirstStrategyFactory::make() |
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); |
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} |
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/** |
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* Retrieves the lazyStrategy, based on the current description. |
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* |
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* @return SearchStrategyFactory |
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* |
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* @todo Add more test puzzles that require multiple solutions, to challenge |
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* the assumptions currently made. |
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*/ |
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private function lazyStrategy(PuzzleDescription $puzzle): SearchStrategyFactory |
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{ |
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if ($puzzle->isExhausting()) { |
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return VisitedNodeSkipperFactory::using( |
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DepthFirstStrategyFactory::make() |
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); |
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} |
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if ($puzzle->onlyBest()) { |
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return WorseThanBestSolutionSkipperFactory::using( |
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BreadthFirstStrategyFactory::make() |
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); |
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} |
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return DuplicateNodeSkipperFactory::using( |
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DepthFirstStrategyFactory::make() |
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); |
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} |
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} |
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Stratadox /
PuzzleSolver
