SpanMixin.php

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<?php
namespace Magento\Setup\Model\Description\Mixin;

class SpanMixin implements DescriptionMixinInterface
{
    private $randomWordSelector;

    private $wordWrapper;

    public function __construct(
        \Magento\Setup\Model\Description\Mixin\Helper\RandomWordSelector $randomWordSelector,
        \Magento\Setup\Model\Description\Mixin\Helper\WordWrapper $wordWrapper
    ) {
        $this->randomWordSelector = $randomWordSelector;
        $this->wordWrapper = $wordWrapper;
    }

    public function apply($text)
    {
        if (empty(strip_tags(trim($text)))) {
            return $text;
        }

        $rawText = strip_tags($text);

        return $this->wordWrapper->wrapWords(
            $text,
            $this->randomWordSelector->getRandomWords($rawText, random_int(5, 8)),
            '<span>%s</span>'
        );
    }
}