File.php

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<?php
namespace Magento\Framework\Backup\Filesystem\Iterator;

class File extends \SplFileObject
{
    protected $_currentStatement = '';

    public function current()
    {
        return $this->_currentStatement;
    }

    public function next()
    {
        $this->_currentStatement = '';
        while (!$this->eof()) {
            $line = $this->fgets();
            if (strlen(trim($line))) {
                $this->_currentStatement .= $line;
                if ($this->_isLineLastInCommand($line)) {
                    break;
                }
            }
        }
    }

    public function rewind()
    {
        parent::rewind();
        $this->next();
    }

    protected function _isComment($line)
    {
        return $line[0] == '#' || substr($line, 0, 2) == '--';
    }

    protected function _isLineLastInCommand($line)
    {
        $cleanLine = trim($line);
        $lineLength = strlen($cleanLine);

        $returnResult = false;
        if ($lineLength > 0) {
            $lastSymbolIndex = $lineLength - 1;
            if ($cleanLine[$lastSymbolIndex] == ';') {
                $returnResult = true;
            }
        }

        return $returnResult;
    }
}