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<?php |
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declare(strict_types=1); |
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namespace Radowoj\Crawla\Link; |
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use Countable; |
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use InvalidArgumentException; |
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use Radowoj\Crawla\Exception\InvalidUrlException; |
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class Collection implements Countable, CollectionInterface |
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{ |
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/** |
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* Items stored in this collection |
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* array keys - urls |
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* array values - depths. |
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* |
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* @var array |
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*/ |
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protected $items = []; |
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/** |
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* Collection constructor. |
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* |
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* @param array $sourceArray [url => depth] |
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*/ |
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public function __construct(array $sourceArray = []) |
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{ |
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$this->items = []; |
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$this->appendArray($sourceArray); |
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return $this; |
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} |
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/** |
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* @param Link $link |
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* |
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* @return CollectionInterface |
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*/ |
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public function push(Link $link): CollectionInterface |
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{ |
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$this->items[$link->getUrl()] = $link->getDepth(); |
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return $this; |
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} |
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/** |
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* @param array $urls |
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* @param int $depth |
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* |
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* @return CollectionInterface |
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*/ |
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public function appendUrlsAtDepth(array $urls, int $depth = 0): CollectionInterface |
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{ |
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$sourceArray = array_fill_keys($urls, $depth); |
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$this->appendArray($sourceArray); |
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return $this; |
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} |
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/** |
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* @param int|null $depth |
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* |
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* @return array |
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*/ |
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public function all(int $depth = null): array |
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{ |
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return null === $depth |
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? array_keys($this->items) |
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: array_keys($this->items, $depth, true); |
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} |
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/** |
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* @return null|Link |
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*/ |
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public function shift(): ?Link |
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{ |
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if (!$this->items) { |
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return null; |
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} |
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$depth = reset($this->items); |
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$url = key($this->items); |
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unset($this->items[$url]); |
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return new Link($url, $depth); |
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} |
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/** |
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* @return int |
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*/ |
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public function count(): int |
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{ |
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return \count($this->items); |
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} |
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/** |
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* @return array |
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*/ |
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public function toArray(): array |
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{ |
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return $this->items; |
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} |
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/** |
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* @param array $sourceArray |
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*/ |
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private function appendArray(array $sourceArray): void |
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{ |
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foreach ($sourceArray as $url => $depth) { |
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if (!\is_string($url)) { |
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throw new InvalidArgumentException('Source array key must be a string (url)'); |
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} |
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if (!\is_int($depth) || $depth < 0) { |
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throw new InvalidArgumentException('Source array value must be a non-negative int (depth)'); |
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} |
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if (!\filter_var($url, FILTER_VALIDATE_URL)) { |
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throw new InvalidUrlException("Provided URL is invalid: {$url}"); |
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} |
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} |
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$this->items = array_merge($sourceArray, $this->items); |
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} |
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} |
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radowoj /
crawla
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.