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<?php |
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namespace Pilipinews\Common; |
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use Symfony\Component\DomCrawler\Crawler; |
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/** |
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* Abstract Scraper |
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* |
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* @package Pilipinews |
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* @author Rougin Royce Gutib <[email protected]> |
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*/ |
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abstract class Scraper |
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{ |
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/** |
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* @var \Symfony\Component\DomCrawler\Crawler |
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*/ |
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protected $crawler; |
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/** |
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* Returns the article content based on a given element. |
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* |
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* @param string $element |
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* @return \Symfony\Component\DomCrawler\Crawler |
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*/ |
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protected function body($element) |
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{ |
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$body = $this->crawler->filter($element)->first()->html(); |
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$body = trim(preg_replace('/\s+/', ' ', $body)); |
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return new Crawler(str_replace(' ', ' ', trim($body))); |
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} |
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/** |
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* Returns the HTML format of the body from the crawler. |
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* |
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* @param \Symfony\Component\DomCrawler\Crawler $crawler |
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* @param string[] $removables |
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* @return string |
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*/ |
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protected function html(Crawler $crawler, $removables = array()) |
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{ |
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$converter = new Converter; |
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$html = $converter->convert($crawler->html()); |
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foreach ((array) $removables as $keyword) { |
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$html = str_replace($keyword, '', $html); |
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$html = str_replace("\n\n\n", '', $html); |
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} |
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return trim(preg_replace('/\s\s+/', "\n\n", $html)); |
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} |
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/** |
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* Initializes the crawler instance. |
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* |
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* @param string $link |
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* @return void |
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*/ |
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protected function prepare($link) |
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{ |
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$response = Client::request((string) $link); |
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$this->crawler = new Crawler($response); |
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} |
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/** |
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* Removes specified HTML tags from body. |
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* |
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* @param string[] $elements |
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* @return void |
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*/ |
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protected function remove($elements) |
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{ |
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$callback = function ($crawler) { |
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$node = $crawler->getNode((integer) 0); |
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$node->parentNode->removeChild($node); |
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}; |
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foreach ((array) $elements as $removable) { |
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$this->crawler->filter($removable)->each($callback); |
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} |
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} |
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/** |
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* Replaces a specified HTML tag based from the given callback. |
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* |
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* @param \Symfony\Component\DomCrawler\Crawler $crawler |
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* @param string $element |
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* @param callable $callback |
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* @return \Symfony\Component\DomCrawler\Crawler |
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*/ |
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protected function replace(Crawler $crawler, $element, $callback) |
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{ |
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$function = function (Crawler $crawler) use ($callback) { |
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$node = $crawler->getNode(0); |
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$html = $node->ownerDocument->saveHtml($node); |
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$text = $callback($crawler, (string) $html); |
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return array((string) $html, (string) $text); |
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}; |
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$items = $crawler->filter($element)->each($function); |
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$html = (string) $crawler->html(); |
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foreach ((array) $items as $item) { |
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$html = str_replace($item[0], $item[1], $html); |
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} |
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return new Crawler((string) $html); |
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} |
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/** |
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* Returns the title text based from given HTML tag. |
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* |
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* @param string $element |
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* @param string $removable |
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* @return string |
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*/ |
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protected function title($element, $removable = '') |
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{ |
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$converter = new Converter; |
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$crawler = $this->crawler->filter($element); |
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$html = $crawler->first()->html(); |
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$html = str_replace($removable, '', $html); |
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return $converter->convert((string) $html); |
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} |
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/** |
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* Parses embedded Twitter tweet in the HTML. |
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* |
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* @param \Symfony\Component\DomCrawler\Crawler $crawler |
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* @return \Symfony\Component\DomCrawler\Crawler |
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*/ |
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protected function tweet(Crawler $crawler) |
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{ |
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$callback = function (Crawler $crawler) { |
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$parsed = (string) $crawler->text(); |
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$text = str_replace('📸: ', '', $parsed); |
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return '<p>TWEET: ' . $text . '</p>'; |
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}; |
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$class = '.twitter-tweet'; |
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return $this->replace($crawler, $class, $callback); |
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} |
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} |
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pilipinews /
common
