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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver; |
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use function assert; |
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use function strtolower; |
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/** |
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* Find |
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* |
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* Value object that provides information on the kind of goal for the puzzle. |
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* Are we looking for just one solution? All of them? Etc. |
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* |
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* @author Stratadox |
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*/ |
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final class Find |
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{ |
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private const THE_ONLY_SOLUTION = 0; |
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private const A_BEST_SOLUTION = 1; |
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private const ALL_BEST_SOLUTIONS = 2; |
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private const ALL_LOOPLESS_SOLUTIONS = 3; |
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private const MAP = [ |
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'the only solution' => FIND::THE_ONLY_SOLUTION, |
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'a best solution' => FIND::A_BEST_SOLUTION, |
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'all best solutions' => FIND::ALL_BEST_SOLUTIONS, |
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'all loopless solutions' => FIND::ALL_LOOPLESS_SOLUTIONS, |
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]; |
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/** @var int */ |
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private $solutionType; |
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public function __construct(int $solutionType) |
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{ |
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$this->solutionType = $solutionType; |
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} |
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public static function theOnlySolution(): self |
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{ |
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return new self(Find::THE_ONLY_SOLUTION); |
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} |
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public static function aBestSolution(): self |
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{ |
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return new self(Find::A_BEST_SOLUTION); |
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} |
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public static function allBestSolutions(): self |
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{ |
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return new self(Find::ALL_BEST_SOLUTIONS); |
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} |
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public static function allLooplessSolutions(): self |
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{ |
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return new self(Find::ALL_LOOPLESS_SOLUTIONS); |
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} |
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public static function fromString(string $type): self |
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{ |
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$type = strtolower($type); |
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assert(isset(Find::MAP[$type])); |
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return new self(Find::MAP[$type]); |
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} |
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public function singleSolution(): bool |
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{ |
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return $this->solutionType === self::THE_ONLY_SOLUTION |
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|| $this->solutionType === self::A_BEST_SOLUTION; |
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} |
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public function onlyBest(): bool |
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{ |
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return $this->solutionType === self::ALL_BEST_SOLUTIONS |
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|| $this->solutionType === self::A_BEST_SOLUTION; |
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} |
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} |
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Stratadox /
PuzzleSolver
