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<?php |
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/** |
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* (c) 2018 Douglas Reith. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Reith\ToyRobot\Domain\Robot; |
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use Assert\Assert; |
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use Reith\ToyRobot\Domain\Space\SpaceInterface; |
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use Reith\ToyRobot\Domain\Robot\Exception\NotPlacedInSpaceException; |
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class Robot |
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{ |
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/** |
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* Purchased by Rupert, then tanked :). |
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* |
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* @var SpaceInterface |
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*/ |
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private $mySpace; |
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private $placement; |
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private function __construct(SpaceInterface $space, Place $placement) |
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{ |
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$this->mySpace = $space; |
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$this->placement = $placement; |
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} |
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/** |
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* @param SpaceInterface $space |
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* @param Place $placement |
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* |
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* @return Robot |
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* |
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* @throws Assert\AssertionFailedException |
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*/ |
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public static function create(SpaceInterface $space, Place $placement): Robot |
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{ |
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return new static($space, $placement); |
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} |
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public function moveNorthward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->placement = $this->mySpace->move( |
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$this->placement, |
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CompassMove::northward() |
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); |
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return $this; |
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} |
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public function moveEastward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->placement = $this->mySpace->move( |
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$this->placement, |
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CompassMove::eastward() |
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); |
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return $this; |
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} |
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public function moveSouthward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->placement = $this->mySpace->move( |
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$this->placement, |
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CompassMove::southward() |
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); |
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return $this; |
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} |
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2 |
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public function moveWestward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->placement = $this->mySpace->move( |
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$this->placement, |
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CompassMove::westward() |
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); |
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return $this; |
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} |
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public function getPlacement(): Place |
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{ |
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return $this->placement; |
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} |
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/** |
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* validateCanMove. |
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* |
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* The robot requires a space during construction, however, |
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* this is extra precautionary in case the space is removed |
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* |
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* @throws NotPlacedInSpaceException |
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*/ |
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private function validateCanMove(): void |
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{ |
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if (!$this->mySpace) { |
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throw new NotPlacedInSpaceException( |
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'I cannot move until placed in space' |
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); |
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} |
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} |
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} |
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reithbot /
toyrobot-php
