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<?php |
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declare(strict_types=1); |
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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 Core23\LastFm\Exception\CrawlException; |
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use Core23\LastFm\Model\Event; |
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use Core23\LastFm\Model\Image; |
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use Core23\LastFm\Model\Venue; |
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use Core23\LastFm\Model\VenueAddress; |
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use DateTime; |
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use Exception; |
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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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private $connection; |
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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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final protected function crawl(string $url, array $params = []): ?Crawler |
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{ |
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if (null !== $content = $this->connection->getPageBody($url, $params)) { |
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return new Crawler($content); |
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} |
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return null; |
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} |
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/** |
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* @param DateTime $datetime |
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*/ |
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final protected function parseEvent(Crawler $node, DateTime $datetime = null): Event |
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{ |
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$eventNode = $node->filter('.events-list-item-event--title a'); |
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$url = $this->parseUrl($eventNode); |
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if (null === $url) { |
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throw new CrawlException('Error parsing event id.'); |
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} |
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$id = (int) preg_replace('/.*\/(\d+)+.*/', '$1', $url); |
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if (0 === $id) { |
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throw new CrawlException('Error parsing event id.'); |
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} |
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if (null === $datetime) { |
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try { |
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$datetime = new DateTime($node->filter('time')->attr('datetime')); |
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} catch (Exception $exception) { |
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throw new CrawlException('Error reading event date', $exception->getCode(), $exception); |
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} |
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} |
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$venue = $this->parseVenue($node->filter('.events-list-item-venue')); |
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return new Event( |
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$id, |
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$this->parseString($eventNode) ?? '', |
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$datetime, |
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$url, |
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$venue |
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); |
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} |
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final protected function parseVenue(Crawler $node): ?Venue |
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{ |
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$title = $this->parseString($node->filter('.events-list-item-venue--title')); |
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if (null === $title) { |
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return null; |
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} |
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$city = $this->parseString($node->filter('.events-list-item-venue--city')); |
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$country = $this->parseString($node->filter('.events-list-item-venue--country')); |
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return new Venue($title, null, null, new VenueAddress( |
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null, |
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null, |
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$city, |
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$country |
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)); |
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} |
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/** |
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* Parses a url node. |
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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 (null !== $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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final protected function parseImage(Crawler $node): ?Image |
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{ |
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$src = $this->parseUrl($node, 'src'); |
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if (null === $src) { |
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return null; |
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} |
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return new Image($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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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 = (string) preg_replace('/<p[^>]*?>/', '', $content); |
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$content = str_replace('</p>', static::NEWLINE, $content); |
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$content = (string) 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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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
