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<?php |
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declare(strict_types=1); |
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/** |
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* This file is part of Scout Extended. |
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* |
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* (c) Algolia Team <[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 Algolia\ScoutExtended\Splitters; |
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use DOMXPath; |
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use DOMDocument; |
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use Algolia\ScoutExtended\Contracts\SplitterContract; |
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class HtmlSplitter implements SplitterContract |
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{ |
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/** |
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* The list of html tags. |
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* |
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* @var string[] |
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*/ |
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protected $acceptedNodes = [ |
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'h1', |
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'h2', |
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'h3', |
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'h4', |
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'h5', |
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'h6', |
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'p', |
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]; |
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/** |
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* Creates a new instance of the class. |
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* |
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* @param array $acceptedNodes |
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* |
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* @return void |
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*/ |
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public function __construct(array $acceptedNodes = null) |
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{ |
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if ($acceptedNodes !== null) { |
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$this->acceptedNodes = $acceptedNodes; |
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} |
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} |
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/** |
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* Find it's value in $acceptedNodes. |
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* |
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* @param array $object |
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* |
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* @return int |
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*/ |
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public function findValue($object): int |
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{ |
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return array_search((key($object)), $this->acceptedNodes); |
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} |
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/** |
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* Add object to queue. |
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* |
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* @param array $object |
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* @param array $queue |
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* |
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* @return array |
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*/ |
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public function addObjectToQueue($object, $queue): array |
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{ |
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if (count($queue) == 0) { |
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$queue[] = $object; |
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return $queue; |
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} else { |
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if ($this->findValue($object) > $this->findValue(end($queue))) { |
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$queue[] = $object; |
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return $queue; |
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} else { |
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array_pop($queue); |
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return $this->addObjectToQueue($object, $queue); |
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} |
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} |
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} |
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/** |
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* Importance formula. |
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* Give integer from tags ranking. |
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* |
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* @param \DOMElement $node |
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* @param array $queue |
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* |
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* @return int |
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*/ |
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public function importanceWeight($node, $queue): int |
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{ |
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if ($node->nodeName == 'p') { |
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if (empty(end($queue))) { |
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return 0; |
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} |
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return (count($this->acceptedNodes) - 1) + (array_search(key(end($queue)), $this->acceptedNodes)); |
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} |
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return array_search($node->nodeName, $this->acceptedNodes); |
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} |
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/** |
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* Clean Records to have a correct format. |
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* |
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* |
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* @param array $records |
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* |
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* @return array |
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*/ |
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public function cleanRecords($records): array |
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{ |
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$newRecords = []; |
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foreach ($records as $record) { |
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foreach ($record as $r) { |
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foreach ($r as $res => $values) { |
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$newRecord[$res] = $values; |
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if ($res == 'importance') { |
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$newRecords[] = $newRecord; |
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$newRecord = []; |
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} |
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} |
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} |
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} |
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return $newRecords; |
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} |
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/** |
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* Acts a static factory. |
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* |
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* @param string|array $tags |
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* |
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* @return static |
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*/ |
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public static function by($tags) |
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{ |
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return new static((array) $tags); |
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} |
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/** |
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* Splits the given value. |
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* |
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* @param object $searchable |
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* @param string $value |
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* |
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* @return array |
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*/ |
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public function split($searchable, $value): array |
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{ |
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$dom = new DOMDocument(); |
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$dom->loadHTML($value); |
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$xpath = new DOMXpath($dom); |
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$queue = []; |
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$xpathQuery = '//'.implode(' | //', $this->acceptedNodes); |
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$nodes = $xpath->query($xpathQuery); |
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foreach ($nodes as $node) { |
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$object = [$node->nodeName => $node->textContent]; |
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$importance = $this->importanceWeight($node, $queue); |
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$queue = $this->addObjectToQueue($object, $queue); |
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$cloneQueue = $queue; |
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$cloneQueue[] = ['importance' => $importance]; |
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$records[] = $cloneQueue; |
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} |
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$records = $this->cleanRecords($records); |
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return $records; |
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} |
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} |
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