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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 MathPHP\LinearAlgebra\Vector; |
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use Assert\Assert; |
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use Assert\Assertion; |
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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 $position; |
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private $facingDirection; |
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private function __construct( |
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SpaceInterface $space, |
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Vector $position, |
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Direction $facingDirection |
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) { |
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$this->mySpace = $space; |
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$this->position = $position; |
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$this->facingDirection = $facingDirection; |
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} |
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/** |
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* @param SpaceInterface $space |
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* @param Vector $position |
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* @param string|null $facingDirection |
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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( |
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SpaceInterface $space, |
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Vector $position, |
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?string $facingDirection = 'E' |
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): Robot { |
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$facingDirection = $facingDirection ?: 'E'; |
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return new static( |
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$space, |
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$position, |
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new Direction($facingDirection) |
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); |
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} |
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/** |
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* @return Robot |
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*/ |
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public function move(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->position = $this->mySpace->move( |
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$this->position, |
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$this->facingDirection->getDirectionAsVector() |
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); |
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return $this; |
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} |
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/** |
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* @return Robot |
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*/ |
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public function left(): Robot |
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{ |
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$this->facingDirection->rotateLeft(); |
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return $this; |
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} |
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/** |
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* @return Robot |
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*/ |
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public function right(): Robot |
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{ |
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$this->facingDirection->rotateRight(); |
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return $this; |
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} |
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/** |
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* @return Robot |
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*/ |
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public function moveNorthward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->position = $this->mySpace->move( |
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$this->position, |
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$this->facingDirection->northward() |
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); |
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return $this; |
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} |
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/** |
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* @return Robot |
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*/ |
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public function moveEastward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->position = $this->mySpace->move( |
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$this->position, |
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$this->facingDirection->eastward() |
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); |
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return $this; |
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} |
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/** |
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* @return Robot |
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*/ |
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public function moveSouthward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->position = $this->mySpace->move( |
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$this->position, |
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$this->facingDirection->southward() |
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); |
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return $this; |
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} |
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/** |
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* @return Robot |
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*/ |
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public function moveWestward(): Robot |
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{ |
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$this->validateCanMove(); |
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$this->position = $this->mySpace->move( |
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$this->position, |
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$this->facingDirection->westward() |
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); |
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return $this; |
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} |
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/** |
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* @return Vector |
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*/ |
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public function getPosition(): Vector |
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{ |
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return $this->position; |
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} |
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/** |
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* @return string In the form 'X,Y,F' |
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*/ |
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public function getReportAsString(): string |
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{ |
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$positionAsString = implode(',', $this->position->getVector()); |
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return $positionAsString . ',' . $this->getFacingDirectionAsString(); |
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} |
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/** |
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* @return string |
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*/ |
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private function getFacingDirectionAsString(): string |
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{ |
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return $this->facingDirection->getDirectionAsString(); |
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} |
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/** |
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* validateCanMove. |
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* |
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* The robot requires a space during construction, however, |
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* this is extra precautionary in case the space is removed |
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* |
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* @throws NotPlacedInSpaceException |
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*/ |
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private function validateCanMove(): void |
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{ |
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if (!$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
