DescriptionSentenceGenerator.php

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

class DescriptionSentenceGenerator
{
    private $dictionary;

    private $sentenceConfig;

    public function __construct(
        \Magento\Setup\Model\Dictionary $dictionary,
        array $sentenceConfig
    ) {
        $this->dictionary = $dictionary;
        $this->sentenceConfig = $sentenceConfig;
    }

    public function generate()
    {
        $sentenceWordsCount = random_int(
            $this->sentenceConfig['words']['count-min'],
            $this->sentenceConfig['words']['count-max']
        );
        $sentence = '';

        while ($sentenceWordsCount) {
            $sentence .= $this->dictionary->getRandWord();
            $sentence .= ' ';
            $sentenceWordsCount--;
        }

        return ucfirst(rtrim($sentence)) . '.';
    }
}