public static IEnumerable <OutlineItem> FromFlatList(LinkedList <Block> headers, OutlineItem last = null)
{
if (headers.Count == 0)
{
yield break;
}
var first = headers.First.Value;
headers.RemoveFirst();
var newItem = new OutlineItem(first);
if (IsChild(last, first.Heading.Level))
{
last.Children.Add(newItem);
}
else
{
yield return(newItem);
}
foreach (var child in FromFlatList(headers, newItem))
{
if (IsChild(newItem, child.Level))
{
newItem.Children.Add(child);
}
else
{
yield return(child);
}
}
}
private static bool IsChild(OutlineItem item, int level)
{
if (item is null)
{
return(false);
}
else
{
return(item.Level < level);
}
}