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<?php declare(strict_types=1); |
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namespace Stratadox\PuzzleSolver\Puzzle\Maze; |
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use Stratadox\PuzzleSolver\Move; |
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use Stratadox\PuzzleSolver\Moves; |
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final class Action implements Move |
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{ |
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private const LEFT = 'left'; |
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private const RIGHT = 'right'; |
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private const UP = 'up'; |
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private const DOWN = 'down'; |
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/** @var string */ |
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private $direction; |
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private function __construct(string $direction) |
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{ |
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$this->direction = $direction; |
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} |
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public static function fromString(string $direction): self |
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{ |
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return new self($direction); |
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} |
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public static function all(): Moves |
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{ |
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return new Moves( |
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self::fromString(self::LEFT), |
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self::fromString(self::RIGHT), |
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self::fromString(self::UP), |
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self::fromString(self::DOWN) |
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); |
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} |
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public function newX(int $prevX): int |
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{ |
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switch ($this->direction) { |
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case self::RIGHT: return $prevX + 1; |
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case self::LEFT: return $prevX - 1; |
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default: return $prevX; |
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} |
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} |
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public function newY(int $prevY): int |
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{ |
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switch ($this->direction) { |
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case self::UP: return $prevY - 1; |
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case self::DOWN: return $prevY + 1; |
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default: return $prevY; |
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} |
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} |
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public function __toString(): string |
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{ |
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return 'move ' . $this->direction; |
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} |
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} |
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Stratadox /
PuzzleSolver
