Dictionary.php

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<?php
namespace Magento\Setup\Model;

class Dictionary
{
    private $dictionaryFilePath;

    private $dictionary;

    public function __construct($dictionaryFilePath)
    {
        $this->dictionaryFilePath = $dictionaryFilePath;
    }

    public function getRandWord()
    {
        if ($this->dictionary === null) {
            $this->readDictionary();
        }

        $randIndex = random_int(0, count($this->dictionary) - 1);
        return trim($this->dictionary[$randIndex]);
    }

    private function readDictionary()
    {
        if (!is_readable($this->dictionaryFilePath)) {
            throw new \Magento\Setup\Exception(
                sprintf('Description file %s not found or is not readable', $this->dictionaryFilePath)
            );
        }

        $rows = file($this->dictionaryFilePath, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

        if ($rows === false) {
            throw new \Magento\Setup\Exception(
                sprintf('Error occurred while reading dictionary file %s', $this->dictionaryFilePath)
            );
        }

        if (empty($rows)) {
            throw new \Magento\Setup\Exception(
                sprintf('Dictionary file %s is empty', $this->dictionaryFilePath)
            );
        }

        $this->dictionary = \SplFixedArray::fromArray($rows);
    }
}