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<?php |
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/* |
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* (c) Christian Gripp <[email protected]> |
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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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namespace Core23\LastFm\Crawler; |
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use Core23\LastFm\Connection\ConnectionInterface; |
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use Symfony\Component\DomCrawler\Crawler; |
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abstract class AbstractCrawler |
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{ |
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public const URL_PREFIX = 'http://last.fm'; |
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public const NEWLINE = "\n"; |
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/** |
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* @var ConnectionInterface |
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*/ |
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protected $connection; |
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/** |
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* AbstractService constructor. |
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* |
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* @param ConnectionInterface $connection |
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*/ |
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public function __construct(ConnectionInterface $connection) |
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{ |
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$this->connection = $connection; |
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} |
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/** |
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* Crawles a url. |
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* |
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* @param string $url |
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* |
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* @return Crawler|null |
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*/ |
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final protected function crawl(string $url): ? Crawler |
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{ |
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if ($content = $this->connection->getPageBody($url)) { |
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return new Crawler($content); |
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} |
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return null; |
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} |
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/** |
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* Parses a url node. |
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* |
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* @param Crawler $node |
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* @param string $attr |
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* |
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* @return null|string |
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*/ |
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final protected function parseUrl(Crawler $node, string $attr = 'href') : ? string |
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{ |
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if (0 === $node->count()) { |
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return null; |
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} |
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if ($url = $node->attr($attr)) { |
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return preg_replace('/^\//', static::URL_PREFIX.'/', $url); |
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} |
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return null; |
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} |
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/** |
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* Parses an image node. |
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* |
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* @param Crawler $node |
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* |
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* @return null|string |
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*/ |
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final protected function parseImage(Crawler $node) : ? string |
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{ |
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return $this->parseUrl($node, 'src'); |
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} |
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/** |
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* Parses a string node. |
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* |
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* @param Crawler $node |
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* @param bool $multiline |
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* |
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* @return null|string |
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*/ |
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final protected function parseString(Crawler $node, bool $multiline = false) : ? string |
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{ |
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if (0 === $node->count()) { |
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return null; |
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} |
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$content = $node->attr('content'); |
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if (null === $content) { |
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if ($multiline) { |
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$content = $node->html(); |
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$content = preg_replace('/<p[^>]*?>/', '', $content); |
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$content = str_replace('</p>', static::NEWLINE, $content); |
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$content = preg_replace('/<br\s?\/?>/i', static::NEWLINE, $content); |
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} else { |
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$content = $node->text(); |
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} |
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} |
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return trim(strip_tags($content)); |
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} |
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/** |
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* Parses a date note. |
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* |
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* @param Crawler $node |
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* |
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* @return \DateTime|null |
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*/ |
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final protected function parseDate(Crawler $node) : ? \DateTime |
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{ |
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$content = $this->parseString($node); |
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if (null !== $content) { |
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return new \DateTime($content); |
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} |
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return null; |
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} |
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} |
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core23 /
lastfm-php-api
