CsvFile::fetch

public function fetch(): ?array
{
	if ($this->fieldsType === self::FIELDS_TYPE_WITH_DELIMITER)
	{
		if ($this->fieldDelimiter === '')
		{
			return null;
		}

		return $this->fetchDelimiter();
	}

	if (empty($this->widthMap))
	{
		return null;
	}

	return $this->fetchWidth();
}