private static void RemoveContiguousWhitespace(IntermediateNodeCollection nodes, TraversalDirection direction)
{
var position = direction == TraversalDirection.Forwards ? 0 : nodes.Count - 1;
while (position >= 0 && position < nodes.Count)
{
var node = nodes[position];
bool shouldRemoveNode;
bool shouldContinueIteration;
switch (node)
{
case IntermediateToken intermediateToken:
shouldRemoveNode = string.IsNullOrWhiteSpace(intermediateToken.Content);
shouldContinueIteration = shouldRemoveNode;
break;
case HtmlContentIntermediateNode htmlContentIntermediateNode:
RemoveContiguousWhitespace(htmlContentIntermediateNode.Children, direction);
shouldRemoveNode = htmlContentIntermediateNode.Children.Count == 0;
shouldContinueIteration = shouldRemoveNode;
break;
case MarkupElementIntermediateNode _:
case CSharpExpressionIntermediateNode _:
case TagHelperIntermediateNode _:
// These node types may produce non-whitespace output at runtime
shouldRemoveNode = false;
shouldContinueIteration = false;
break;
case CSharpCodeIntermediateNode codeIntermediateNode:
shouldRemoveNode = false;
shouldContinueIteration = false;
break;
default:
shouldRemoveNode = false;
shouldContinueIteration = true; // Because other types of nodes don't produce output
break;
}
if (shouldRemoveNode)
{
nodes.RemoveAt(position);
if (direction == TraversalDirection.Forwards)
{
position--;
}
}
position += direction == TraversalDirection.Forwards ? 1 : -1;
if (!shouldContinueIteration)
{
break;
}
}
}
