createDocumentStructure method

(MarkupRenderObject, MarkupRenderObject, MarkupRenderObject) createDocumentStructure(MarkupRenderObject root)

Implementation

(MarkupRenderObject, MarkupRenderObject, MarkupRenderObject) createDocumentStructure(MarkupRenderObject root) {
  var html = root.children.findWhere((c) => c.tag == 'html')?.node;
  if (html == null) {
    var range = root.children.range();
    root.children.insertAfter(
      html = root.createChildRenderObject()
        ..tag = 'html'
        ..children.insertNodeAfter(range),
    );
  }

  var headNode = html.children.findWhere((c) => c.tag == 'head');
  var head = headNode?.node;
  var bodyNode = html.children.findWhere((c) => c.tag == 'body');
  var body = bodyNode?.node;

  if (head == null) {
    head = html.createChildRenderObject()..tag = 'head';
    head.children.insertAfter(head.createChildRenderObject()
      ..tag = 'base'
      ..attributes = {'href': '/'});

    if (body == null) {
      var range = html.children.range();
      html.children.insertAfter(head);
      html.children.insertBefore(body = html.createChildRenderObject()
        ..tag = 'body'
        ..children.insertNodeAfter(range));
    } else {
      html.children.insertAfter(head);
    }
  } else {
    if (body == null) {
      var rangeBefore = html.children.range(endBefore: headNode);
      var rangeAfter = html.children.range(startAfter: headNode);

      body = html.createChildRenderObject()..tag = 'body';
      body.children
        ..insertNodeAfter(rangeAfter)
        ..insertNodeAfter(rangeBefore);
      html.children.insertAfter(body, after: head);
    }

    var base = head.children.findWhere((c) => c.tag == 'base');
    if (base == null) {
      head.children.insertAfter(head.createChildRenderObject()
        ..tag = 'base'
        ..attributes = {'href': '/'});
    }
  }

  return (html, head, body);
}