private function parseLine($raw_line)
    {
        $raw_line = $this->parseExport($raw_line);

        list($key, $value) = $this->parseKeyValue($raw_line);

        $key = $this->key_parser->parse($key);

        if (!is_string($key)) {
            return;
        }

        $this->lines[$key] = $this->value_parser->parse($value);
    }