public JItem mapItem(JItem itemi)
{
JNodeInfo item = (JNodeInfo)itemi;
bool isWhite = item.getNodeKind() == net.sf.saxon.type.Type.TEXT && JWhitespace.isWhite(item.getStringValueCS());
return(isWhite ? null : item);
}
/// <summary>Locate and compile a stylesheet identified by an <?xml-stylesheet?>
/// processing instruction within a source document.
/// </summary>
/// <param name="source">The document node of the source document containing the
/// xml-stylesheet processing instruction.</param>
/// <returns>An <c>XsltExecutable</c> which represents the compiled stylesheet object.</returns>
/// <remarks>There are some limitations in the current implementation. The media type
/// is ignored, as are the other parameters of the xml-stylesheet instruction. The
/// href attribute must either reference an embedded stylesheet within the same
/// document or a non-embedded external stylesheet.</remarks>
public XsltExecutable CompileAssociatedStylesheet(XdmNode source)
{
// TODO: lift the restrictions
if (source == null || source.NodeKind != XmlNodeType.Document)
{
throw new ArgumentException("Source must be a document node");
}
IEnumerator kids = source.EnumerateAxis(XdmAxis.Child);
QName xmlstyle = new QName("", "xml-stylesheet");
while (kids.MoveNext())
{
XdmNode n = (XdmNode)kids.Current;
if (n.NodeKind == XmlNodeType.ProcessingInstruction &&
n.NodeName.Equals(xmlstyle))
{
// TODO: check the media type
String href = JProcInstParser.getPseudoAttribute(n.StringValue, "href");
if (href == null)
{
throw new DynamicError("xml-stylesheet processing instruction has no href attribute");
}
String fragment = null;
int hash = href.LastIndexOf('#');
if (hash == 0)
{
if (href.Length == 1)
{
throw new DynamicError("Relative URI of '#' is invalid");
}
fragment = href.Substring(1);
JNodeInfo target = ((JDocumentInfo)source.value).selectID(fragment);
XdmNode targetWrapper = null;
if (target == null)
{
// There's a problem here because the Microsoft XML parser doesn't
// report id values, so selectID() will never work. We work around that
// by looking for an attribute named "id" appearing on an xsl:stylesheet
// or xsl:transform element
QName qid = new QName("", "id");
IEnumerator en = source.EnumerateAxis(XdmAxis.Descendant);
while (en.MoveNext())
{
XdmNode x = (XdmNode)en.Current;
if (x.NodeKind == XmlNodeType.Element &&
x.NodeName.Uri == "http://www.w3.org/1999/XSL/Transform" &&
(x.NodeName.LocalName == "stylesheet" || x.NodeName.LocalName == "transform" &&
x.GetAttributeValue(qid) == fragment))
{
targetWrapper = x;
}
}
}
else
{
targetWrapper = (XdmNode)XdmValue.Wrap(target);
}
if (targetWrapper == null)
{
throw new DynamicError("No element with id='" + fragment + "' found");
}
return(Compile(targetWrapper));
}
else if (hash > 0)
{
throw new NotImplementedException("href cannot identify an embedded stylesheet in a different document");
}
else
{
Uri uri = new Uri(n.BaseUri, href);
return(Compile(uri));
}
}
}
throw new DynamicError("xml-stylesheet processing instruction not found");
}