private function parse()
    {
        $this->lines = [];
        $parser = new SegmentParser();
        foreach (explode(';', $this->sMappings) as $num => $sLine) {
            $sLine = trim($sLine);
            if ($sLine !== '') {
                $this->lines[$num] = Line::loadFromMappings($num, $sLine, $parser, $this->context);
            }
        }
    }