protected function _initLines($content)
    {
        if (!$this->_states['lines']) {
            return;
        }
        $lines = explode("\n", $content);
        $nbLines = count($lines);
        if ($this->_states['lines']) {
            for ($i = 0; $i < $nbLines; $i++) {
                $this->_root->lines['content'][$i] = [
                    'body' => $lines[$i],
                    'nodes' => [],
                    'coverable' => false
                ];
            }
        }
    }