protected function init()
    {
        $this->escapableControlCharactersPattern = $this->getEscapableControlCharactersPattern();
        $this->controlCharactersEscapingMap = $this->getControlCharactersEscapingMap();
        $this->controlCharactersEscapingReverseMap = array_flip($this->controlCharactersEscapingMap);
    }