bool visitElementBefore()

in packages/flutter_markdown/lib/src/builder.dart [194:273]
64 lines of code
17 McCabe index (conditional complexity)

  bool visitElementBefore(md.Element element) {
    final String tag = element.tag;
    _currentBlockTag ??= tag;
    _lastVisitedTag = tag;

    if (builders.containsKey(tag)) {
      builders[tag]!.visitElementBefore(element);
    }

    if (paddingBuilders.containsKey(tag)) {
      paddingBuilders[tag]!.visitElementBefore(element);
    }

    int? start;
    if (_isBlockTag(tag)) {
      _addAnonymousBlockIfNeeded();
      if (_isListTag(tag)) {
        _listIndents.add(tag);
        if (element.attributes['start'] != null)
          start = int.parse(element.attributes['start']!) - 1;
      } else if (tag == 'blockquote') {
        _isInBlockquote = true;
      } else if (tag == 'table') {
        _tables.add(_TableElement());
      } else if (tag == 'tr') {
        final int length = _tables.single.rows.length;
        BoxDecoration? decoration =
            styleSheet.tableCellsDecoration as BoxDecoration?;
        if (length == 0 || length.isOdd) {
          decoration = null;
        }
        _tables.single.rows.add(TableRow(
          decoration: decoration,
          // TODO(stuartmorgan): This should be fixed, not suppressed; enabling
          // this lint warning exposed that the builder is modifying the
          // children of TableRows, even though they are @immutable.
          // ignore: prefer_const_literals_to_create_immutables
          children: <Widget>[],
        ));
      }
      final _BlockElement bElement = _BlockElement(tag);
      if (start != null) {
        bElement.nextListIndex = start;
      }
      _blocks.add(bElement);
    } else {
      if (tag == 'a') {
        final String? text = extractTextFromElement(element);
        // Don't add empty links
        if (text == null) {
          return false;
        }
        final String? destination = element.attributes['href'];
        final String title = element.attributes['title'] ?? '';

        _linkHandlers.add(
          delegate.createLink(text, destination, title),
        );
      }

      _addParentInlineIfNeeded(_blocks.last.tag);

      // The Markdown parser passes empty table data tags for blank
      // table cells. Insert a text node with an empty string in this
      // case for the table cell to get properly created.
      if (element.tag == 'td' &&
          element.children != null &&
          element.children!.isEmpty) {
        element.children!.add(md.Text(''));
      }

      final TextStyle parentStyle = _inlines.last.style!;
      _inlines.add(_InlineElement(
        tag,
        style: parentStyle.merge(styleSheet.styles[tag]),
      ));
    }

    return true;
  }