ProgressFactory.php

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

use Magento\Setup\Model\Installer;
use Magento\Setup\Model\WebLogger;

class ProgressFactory
{
    public function createFromLog(WebLogger $logger)
    {
        $total = 1;
        $current = 0;
        $contents = implode('', $logger->get());
        if (preg_match_all(Installer::PROGRESS_LOG_REGEX, $contents, $matches, PREG_SET_ORDER)) {
            $last = array_pop($matches);
            list(, $current, $total) = $last;
        }
        $progress = new Progress($total, $current);
        return $progress;
    }
}