private static void AddPreserveFormat(
[NotNull] this XElement parentNode,
[NotNull] XElement newElement,
[CanBeNull] XElement insertAfterElement)
{
Code.NotNull(parentNode, nameof(parentNode));
Code.NotNull(newElement, nameof(newElement));
Code.AssertState(parentNode.Document != null, "The parent node should be attached to document.");
Code.AssertState(newElement.Document == null, "The new node should not be attached to document.");
// The node after that we'll insert new one
var insertNode = insertAfterElement ?? parentNode.Nodes().LastOrDefault(n => !(n is XText));
// Find indentation text for item and for closing parent node (lazily)
var closeTagIndentText = Lazy.Create(
() =>
parentNode.ScanUp().FirstIndentNodeOrDefault()?.Value
?? NewLineChars);
var indentText =
insertNode?.NodesBeforeSelf().FirstIndentNodeOrDefault()?.Value
?? (closeTagIndentText.Value + IndentChars);
var indentNode = new XText(indentText);
if (insertNode != null)
{
// There's element or comment in parent: add indent and new node after it
insertNode.AddAfterSelf(indentNode);
indentNode.AddAfterSelf(newElement);
}
else
{
// Parent has no elements: search new line indent for closing parent node
var closeTagIndentNode = parentNode.Nodes().FirstIndentNodeOrDefault();
if (closeTagIndentNode != null)
{
// There is indent for closing parent node: insert before it
closeTagIndentNode.AddBeforeSelf(indentNode);
indentNode.AddAfterSelf(newElement);
}
else
{
// Add indent, new node and indent for closing parent node
parentNode.Add(indentNode);
indentNode.AddAfterSelf(newElement);
newElement.AddAfterSelf(new XText(closeTagIndentText.Value));
}
}
}
public static void AddAfterSelfIndented(this XNode self, XElement addedElement)
{
string selfIndent;
if (TryGetElementIndent(self, out selfIndent))
{
IndentDescendantNodes(addedElement, selfIndent);
var newLineAndIndent = new XText("\n" + selfIndent);
self.AddAfterSelf(newLineAndIndent);
newLineAndIndent.AddAfterSelf(addedElement);
}
else
{
// Ignore indent
self.AddAfterSelf(addedElement);
}
}