private IEnumerable <T> EvaluateIterator <T>(XPathNodeIterator result)
{
foreach (XPathNavigator navigator in result)
{
object r = navigator.UnderlyingObject;
if (!(r is T))
{
throw new InvalidOperationException(SR.Format(SR.InvalidOperation_UnexpectedEvaluation, r.GetType()));
}
yield return((T)r);
XText t = r as XText;
if (t != null && t.GetParent() != null)
{
do
{
t = t.NextNode as XText;
if (t == null)
{
break;
}
yield return((T)(object)t);
} while (t != t.GetParent().LastNode);
}
}
}
static XText CalibrateText(XText n)
{
if (n.GetParent() == null)
{
return(n);
}
XNode p = n.GetParent().LastNode;
while (true)
{
p = p.NextNode;
XText t = p as XText;
if (t != null)
{
do
{
if (p == n)
{
return(t);
}
p = p.NextNode;
} while (p is XText);
}
}
}
static string CollectText(XText n)
{
string s = n.Value;
if (n.GetParent() != null)
{
while (n != n.GetParent().LastNode)
{
n = n.NextNode as XText;
if (n == null)
{
break;
}
s += n.Value;
}
}
return(s);
}
private static string CollectText(XText n)
{
string s = n.Value;
if (n.GetParent() != null)
{
foreach (XNode node in n.NodesAfterSelf())
{
XText?t = node as XText;
if (t == null)
{
break;
}
s += t.Value;
}
}
return(s);
}
private static XText CalibrateText(XText n)
{
XContainer?parentNode = n.GetParent();
if (parentNode == null)
{
return(n);
}
foreach (XNode node in parentNode.Nodes())
{
XText?t = node as XText;
bool isTextNode = t != null;
if (isTextNode && node == n)
{
return(t !);
}
}
System.Diagnostics.Debug.Fail("Parent node doesn't contain itself.");
return(null);
}
/// <summary>
/// Creates an <see cref="XPathNavigator"/> for a given <see cref="XNode"/>
/// </summary>
/// <param name="node">Extension point <see cref="XNode"/></param>
/// <param name="nameTable">The <see cref="XmlNameTable"/> to be used by
/// the <see cref="XPathNavigator"/></param>
/// <returns>An <see cref="XPathNavigator"/></returns>
public static XPathNavigator CreateNavigator(this XNode node, XmlNameTable nameTable)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (node is XDocumentType)
{
throw new ArgumentException(SR.Format(SR.Argument_CreateNavigator, XmlNodeType.DocumentType));
}
XText text = node as XText;
if (text != null)
{
if (text.GetParent() is XDocument)
{
throw new ArgumentException(SR.Format(SR.Argument_CreateNavigator, XmlNodeType.Whitespace));
}
node = CalibrateText(text);
}
return(new XNodeNavigator(node, nameTable));
}
static bool IsSamePosition(XNodeNavigator n1, XNodeNavigator n2)
{
if (n1.source == n2.source && n1.parent == n2.parent)
{
return(true);
}
// compare lazy text with eager text
if (n1.parent != null ^ n2.parent != null)
{
XText t1 = n1.source as XText;
if (t1 != null)
{
return((object)t1.Value == (object)n2.source && t1.GetParent() == n2.parent);
}
XText t2 = n2.source as XText;
if (t2 != null)
{
return((object)t2.Value == (object)n1.source && t2.GetParent() == n1.parent);
}
}
return(false);
}
