DataFinder.php

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<?php

declare(strict_types=1);

namespace ILIAS\MetaData\Editor\Full\Services;

use ILIAS\MetaData\Elements\ElementInterface;
use ILIAS\MetaData\Elements\Data\Type;

class DataFinder
{
    public function getDataCarryingElements(
        ElementInterface $start_element,
        bool $skip_vocab_source = false
    ): \Generator {
        $elements = $this->getDataElementsInSubElements(
            $start_element,
            $skip_vocab_source,
            0
        );
        yield from $elements;
    }

    protected function getDataElementsInSubElements(
        ElementInterface $current_element,
        bool $skip_vocab_source,
        int $depth
    ): array {
        if ($depth > 20) {
            throw new \ilMDEditorException('LOM Structure is nested to deep.');
        }
        $elements = [];
        $type = $current_element->getDefinition()->dataType();
        if (
            $type !== Type::NULL &&
            !($skip_vocab_source && $type === Type::VOCAB_SOURCE)
        ) {
            $elements[] = $current_element;
        }
        foreach ($current_element->getSubElements() as $sub) {
            $elements = array_merge(
                $elements,
                $this->getDataElementsInSubElements(
                    $sub,
                    $skip_vocab_source,
                    $depth + 1
                )
            );
        }
        return $elements;
    }
}