DescriptionParagraphGenerator.php

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

class DescriptionParagraphGenerator
{
    private $sentenceGenerator;

    private $paragraphConfig;

    public function __construct(
        \Magento\Setup\Model\Description\DescriptionSentenceGenerator $sentenceGenerator,
        array $paragraphConfig
    ) {
        $this->sentenceGenerator = $sentenceGenerator;
        $this->paragraphConfig = $paragraphConfig;
    }

    public function generate()
    {
        $sentencesCount = random_int(
            $this->paragraphConfig['sentences']['count-min'],
            $this->paragraphConfig['sentences']['count-max']
        );
        $sentences = '';

        while ($sentencesCount) {
            $sentences .= $this->sentenceGenerator->generate();
            $sentences .= ' ';
            $sentencesCount--;
        }

        $sentences = rtrim($sentences);

        return $sentences;
    }
}