IEnumerable <DomElementEvent> CloseUntilMatch(string name, Fragment closingFragment)
{
// Find an element to close
var close = stack.FirstOrDefault(x => x.IsNamed(name));
if (close != null)
{
if (stack.Count > 0 && !stack.Peek().IsNamed(name))
{
stack.Pop();
yield return(DomElementEvent.Pop(null));
}
stack.Pop();
yield return(DomElementEvent.Pop(closingFragment));
}
}
IEnumerable <DomElementEvent> _Execute(IEnumerable <Fragment> fragments)
{
foreach (var fragment in fragments)
{
switch (fragment.FragmentType)
{
case FragmentType.Comment:
case FragmentType.Doctype:
case FragmentType.Text:
yield return(DomElementEvent.Child(fragment));
break;
case FragmentType.Close:
if (VoidElements.Contains(fragment.Value.ToLowerInvariant()))
{
break;
}
if (stack.Any(x => x.IsNamed(fragment.Value)))
{
foreach (var close in CloseUntilMatch(fragment.Value, fragment))
{
yield return(close);
}
}
else
{
// If there's nothing to close, this is invalid HTML, push through
// as a child of the current node, but do not pop the stack.
yield return(new DomElementEvent(fragment, DomElementEventType.Child));
}
break;
case FragmentType.Open:
var nameLower = fragment.Value.ToLowerInvariant();
if (ParagraphClosingTags.Contains(nameLower))
{
foreach (var pClose in CloseUntilMatch("p", null))
{
yield return(pClose);
}
}
else if (nameLower == "li")
{
// Find the first UL or LI.
var parentLiOrUl = stack.FirstOrDefault(x => x.IsNamed("li") || x.IsNamed("ul"));
// If something is found and it's an LI, then we can close it.
// (Note: checking for ULs so we don't close an LI from a grand-parent UL)
if (parentLiOrUl?.IsNamed("li") == true)
{
foreach (var liClose in CloseUntilMatch("li", parentLiOrUl.AsCloseFragment()))
{
yield return(liClose);
}
}
}
bool shouldPush = !fragment.IsSelfClosing && !VoidElements.Contains(fragment.Value.ToLowerInvariant());
var eventType = shouldPush ? DomElementEventType.Push : DomElementEventType.Child;
yield return(new DomElementEvent(fragment, eventType));
if (shouldPush)
{
stack.Push(fragment);
}
break;
}
}
while (stack.Count > 0)
{
stack.Pop();
yield return(DomElementEvent.Pop(null));
}
}