// convert nodes to /x/net/html.Node siblings.
// Document node children are integrated as siblings.
// Nils are skipped.
func (s Siblings) convert(parent *html.Node) (first, last *html.Node) {
var prev *html.Node
for _, n := range s {
if n == nil {
continue
}
if n.Type == html.DocumentNode {
start, end := n.Children.convert(parent)
if prev != nil {
prev.NextSibling = start
} else {
first = start
}
prev = end
continue
}
h := n.convert()
h.Parent = parent
h.PrevSibling = prev
if prev != nil {
prev.NextSibling = h
} else {
first = h
}
prev = h
}
return first, prev
}