//ExEnd
//ExStart
//ExId:ExtractBetweenNodes_Helpers
//ExSummary:The helper methods used by the ExtractContent method.
/// <summary>
/// Checks the input parameters are correct and can be used. Throws an exception if there is any problem.
/// </summary>
private static void VerifyParameterNodes(Node startNode, Node endNode)
{
// The order in which these checks are done is important.
if (startNode == null)
throw new ArgumentException("Start node cannot be null");
if (endNode == null)
throw new ArgumentException("End node cannot be null");
if (!startNode.Document.Equals(endNode.Document))
throw new ArgumentException("Start node and end node must belong to the same document");
if (startNode.GetAncestor(NodeType.Body) == null || endNode.GetAncestor(NodeType.Body) == null)
throw new ArgumentException("Start node and end node must be a child or descendant of a body");
// Check the end node is after the start node in the DOM tree
// First check if they are in different sections, then if they're not check their position in the body of the same section they are in.
Section startSection = (Section)startNode.GetAncestor(NodeType.Section);
Section endSection = (Section)endNode.GetAncestor(NodeType.Section);
int startIndex = startSection.ParentNode.IndexOf(startSection);
int endIndex = endSection.ParentNode.IndexOf(endSection);
if (startIndex == endIndex)
{
if (startSection.Body.IndexOf(startNode) > endSection.Body.IndexOf(endNode))
throw new ArgumentException("The end node must be after the start node in the body");
}
else if (startIndex > endIndex)
throw new ArgumentException("The section of end node must be after the section start node");
}
/// <summary>
/// Checks if a node passed is an inline node.
/// </summary>
private static bool IsInline(Node node)
{
// Test if the node is desendant of a Paragraph or Table node and also is not a paragraph or a table a paragraph inside a comment class which is decesant of a pararaph is possible.
return ((node.GetAncestor(NodeType.Paragraph) != null || node.GetAncestor(NodeType.Table) != null) && !(node.NodeType == NodeType.Paragraph || node.NodeType == NodeType.Table));
}
