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<?php |
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namespace Jerodev\Diglett; |
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use Jerodev\Diglett\CssFilters\ICssFilter; |
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use Symfony\Component\DomCrawler\Crawler; |
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class Diglett |
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{ |
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/** |
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* The Symfony DomCrawler to work with. |
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* |
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* @var Crawler|null |
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*/ |
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private $crawler; |
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/** |
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* The css selector parser |
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* |
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* @var CssFilterParser |
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*/ |
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private $cssFilterParser; |
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/** |
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* Create a diglett instance from a Symfony Crawler. |
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* |
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* @param Crawler|null $crawler |
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* @param ICssFilter[] $cssFilters An array of extra ICssFilterl classes to filter on |
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*/ |
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public function __construct(?Crawler $crawler = null, array $cssFilters = []) |
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{ |
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$this->crawler = $crawler; |
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$this->cssFilterParser = new CssFilterParser($cssFilters); |
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} |
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/** |
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* Get the underlying crawler object |
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* |
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* @return Crawler|null |
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*/ |
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public function getCrawler(): ?Crawler |
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{ |
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return $this->crawler; |
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} |
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/** |
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* Use special css selectors to filter on the current node collection |
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* |
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* @param string $selector |
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* @return Diglett |
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*/ |
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public function filter(string $selector): Diglett |
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{ |
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$parsedSelector = $this->cssFilterParser->parse($selector); |
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$crawler = $this->getCrawler(); |
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foreach ($parsedSelector as $part) { |
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if (empty($crawler) || $crawler->count() === 0) { |
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break; |
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} |
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$crawler = $crawler->filter($part['selector']); |
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foreach ($part['functions'] as $function) { |
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$crawler = $function->filterNodes($crawler); |
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if ($crawler === null) { |
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break; |
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} |
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} |
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} |
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return new self($crawler); |
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} |
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/** |
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* Use special css selectors to fetch several values |
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* |
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* @param string[] $selectors |
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* @return array |
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*/ |
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public function getTexts(array $selectors): array |
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{ |
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$results = []; |
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foreach ($selectors as $key => $value) |
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{ |
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$results[$key] = $this->getText($value); |
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} |
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return $results; |
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} |
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/** |
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* Get the value for a single special css selector |
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* |
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* @param string $selector |
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* @return string|null |
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*/ |
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public function getText(string $selector): ?string |
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{ |
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$attribute = null; |
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$selector = preg_replace_callback( |
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'/\{(.*?)\}$/', |
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function ($matches) use (&$attribute) { |
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$attribute = $matches[1] ?? null; |
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}, |
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$selector |
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); |
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$diglett = $this->filter($selector); |
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if ($diglett->nodeCount() === 0) { |
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return null; |
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} |
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$crawler = $diglett->getCrawler(); |
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return $attribute === null ? $crawler->text() : $crawler->attr($attribute); |
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} |
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/** |
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* Fetch urls from the selected nodes (a[href], img[src]) |
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*/ |
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public function getUrls(string $selector): array |
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{ |
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$diglett = $this->filter($selector); |
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if ($diglett->nodeCount() === 0) { |
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return []; |
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} |
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$crawler = $diglett->getCrawler(); |
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$absolute = implode('/', array_slice(preg_split('/\//', $crawler->getUri()), 0, 3)) . '/'; |
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$relative = substr(preg_replace('/\?.*?$/', '', $crawler->getUri()), 0, strrpos($crawler->getUri(), '/') + 1); |
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return $crawler |
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->reduce(function ($node) { |
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return in_array(strtolower($node->nodeName()), ['a', 'img']); |
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}) |
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->each(function ($node) use ($absolute, $relative) { |
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$url = null; |
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switch (strtolower($node->nodeName())) |
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{ |
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case 'a': |
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$url = $node->attr('href'); |
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break; |
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case 'img': |
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$url = $node->attr('src'); |
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break; |
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} |
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if (preg_match('/^https?:\/\//', $url) !== 1) |
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{ |
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if ($url[0] === '/') |
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$url = $absolute . ltrim($url, '/'); |
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else |
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$url = $relative . ltrim($url, '/'); |
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} |
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return $url; |
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}); |
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} |
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/** |
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* Find the node count on the current crawler instance |
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*/ |
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public function nodeCount(): int |
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{ |
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if ($this->crawler === null) { |
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return 0; |
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} |
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return $this->crawler->count(); |
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} |
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} |
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jerodev /
diglett
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