public JsNode ReplaceWith(Func <JsNode, JsNode> replaceFunction) { if (replaceFunction == null) { throw new ArgumentNullException("replaceFunction"); } if (parent == null) { throw new InvalidOperationException("Cannot replace the root node"); } var oldParent = parent; var oldSuccessor = nextSibling; var oldRole = this.Role; Remove(); JsNode replacement = replaceFunction(this); if (oldSuccessor != null && oldSuccessor.parent != oldParent) { throw new InvalidOperationException("replace function changed nextSibling of node being replaced?"); } if (replacement != null) { if (replacement.parent != null) { throw new InvalidOperationException("replace function must return the root of a tree"); } if (!oldRole.IsValid(replacement)) { throw new InvalidOperationException(string.Format("The new node '{0}' is not valid in the role {1}", replacement.GetType().Name, oldRole.ToString())); } if (oldSuccessor != null) { oldParent.InsertChildBeforeUnsafe(oldSuccessor, replacement, oldRole); } else { oldParent.AddChildUnsafe(replacement, oldRole); } } return(replacement); }
/// <summary> /// Replaces this node with the new node. /// </summary> public void ReplaceWith(JsNode newNode) { if (newNode == null) { Remove(); return; } if (newNode == this) { return; // nothing to do... } if (parent == null) { throw new InvalidOperationException("Cannot replace the root node"); } ThrowIfFrozen(); // Because this method doesn't statically check the new node's type with the role, // we perform a runtime test: if (!this.Role.IsValid(newNode)) { throw new ArgumentException($"The new node '{newNode.GetType().Name}' is not valid in the role {this.Role.ToString()}", "newNode"); } if (newNode.parent != null) { // newNode is used within this tree? if (newNode.Ancestors.Contains(this)) { // e.g. "parenthesizedExpr.ReplaceWith(parenthesizedExpr.Expression);" // enable automatic removal newNode.Remove(); } else { throw new ArgumentException("Node is already used in another tree.", "newNode"); } } if (newNode.IsFrozen) { throw new ArgumentException("Cannot add a frozen node.", "newNode"); } newNode.parent = parent; newNode.role = this.Role; newNode.prevSibling = prevSibling; newNode.nextSibling = nextSibling; if (prevSibling != null) { Debug.Assert(prevSibling.nextSibling == this); prevSibling.nextSibling = newNode; } else { Debug.Assert(parent.firstChild == this); parent.firstChild = newNode; } if (nextSibling != null) { Debug.Assert(nextSibling.prevSibling == this); nextSibling.prevSibling = newNode; } else { Debug.Assert(parent.lastChild == this); parent.lastChild = newNode; } parent = null; prevSibling = null; nextSibling = null; }