public static double ToDouble(XPathItem item)
{
XsltLibrary.CheckXsltValue(item);
if (item.IsNode)
{
return(XPathConvert.StringToDouble(item.Value));
}
Type itemType = item.ValueType;
if (itemType == StringType)
{
return(XPathConvert.StringToDouble(item.Value));
}
else if (itemType == DoubleType)
{
return(item.ValueAsDouble);
}
else
{
Debug.Assert(itemType == BooleanType, $"Unexpected type of atomic sequence {itemType}");
return(item.ValueAsBoolean ? 1d : 0d);
}
}
//------------------------------------------------------------------------
// ToBoolean (internal type to internal type)
//------------------------------------------------------------------------
public static bool ToBoolean(XPathItem item)
{
XsltLibrary.CheckXsltValue(item);
if (item.IsNode)
{
return(true);
}
Type itemType = item.ValueType;
if (itemType == StringType)
{
return(item.Value.Length != 0);
}
else if (itemType == DoubleType)
{
// (x < 0 || 0 < x) == (x != 0) && !Double.IsNaN(x)
double dbl = item.ValueAsDouble;
return(dbl < 0 || 0 < dbl);
}
else
{
Debug.Assert(itemType == BooleanType, $"Unexpected type of atomic sequence {itemType}");
return(item.ValueAsBoolean);
}
}
public static bool ToBoolean(IList <XPathItem> listItems)
{
XsltLibrary.CheckXsltValue(listItems);
if (listItems.Count == 0)
{
return(false);
}
return(ToBoolean(listItems[0]));
}
public static string ToString(IList <XPathItem> listItems)
{
XsltLibrary.CheckXsltValue(listItems);
if (listItems.Count == 0)
{
return(string.Empty);
}
return(ToString(listItems[0]));
}
public static IList <XPathNavigator> ToNodeSet(IList <XPathItem> listItems)
{
XsltLibrary.CheckXsltValue(listItems);
if (listItems.Count == 1)
{
return(new XmlQueryNodeSequence(ToNode(listItems[0])));
}
return(XmlILStorageConverter.ItemsToNavigators(listItems));
}
public static XPathNavigator ToNode(IList <XPathItem> listItems)
{
XsltLibrary.CheckXsltValue(listItems);
if (listItems.Count == 1)
{
return(ToNode(listItems[0]));
}
throw new XslTransformException(SR.Xslt_NodeSetNotNode, string.Empty);
}
public static double ToDouble(IList <XPathItem> listItems)
{
XsltLibrary.CheckXsltValue(listItems);
if (listItems.Count == 0)
{
return(double.NaN);
}
return(ToDouble(listItems[0]));
}
public static string ToString(XPathItem item)
{
XsltLibrary.CheckXsltValue(item);
// Use XPath 1.0 rules to convert double to string
if (!item.IsNode && item.ValueType == DoubleType)
{
return(XPathConvert.DoubleToString(item.ValueAsDouble));
}
return(item.Value);
}
//------------------------------------------------
// Msxml Extension Functions
//------------------------------------------------
public static double MSNumber(IList <XPathItem> value)
{
XsltLibrary.CheckXsltValue(value);
if (value.Count == 0)
{
return(Double.NaN);
}
XPathItem item = value[0];
string stringValue;
if (item.IsNode)
{
stringValue = item.Value;
}
else
{
Type itemType = item.ValueType;
if (itemType == XsltConvert.StringType)
{
stringValue = item.Value;
}
else if (itemType == XsltConvert.DoubleType)
{
return(item.ValueAsDouble);
}
else
{
Debug.Assert(itemType == XsltConvert.BooleanType, "Unexpected type of atomic value " + itemType.ToString());
return(item.ValueAsBoolean ? 1d : 0d);
}
}
Debug.Assert(stringValue != null);
double d;
if (XmlConvert.TryToDouble(stringValue, out d) != null)
{
d = double.NaN;
}
return(d);
}
//------------------------------------------------------------------------
// EnsureXXX methods (TreatAs)
//------------------------------------------------------------------------
public static IList <XPathNavigator> EnsureNodeSet(IList <XPathItem> listItems)
{
XsltLibrary.CheckXsltValue(listItems);
if (listItems.Count == 1)
{
XPathItem item = listItems[0];
if (!item.IsNode)
{
throw new XslTransformException(SR.XPath_NodeSetExpected, string.Empty);
}
if (item is RtfNavigator)
{
throw new XslTransformException(SR.XPath_RtfInPathExpr, string.Empty);
}
}
return(XmlILStorageConverter.ItemsToNavigators(listItems));
}
//------------------------------------------------
// EXslt Functions
//------------------------------------------------
public static string EXslObjectType(IList <XPathItem> value)
{
if (value.Count != 1)
{
XsltLibrary.CheckXsltValue(value);
return("node-set");
}
XPathItem item = value[0];
if (item is RtfNavigator)
{
return("RTF");
}
else if (item.IsNode)
{
Debug.Assert(item is XPathNavigator);
return("node-set");
}
object o = item.TypedValue;
if (o is string)
{
return("string");
}
else if (o is double)
{
return("number");
}
else if (o is bool)
{
return("boolean");
}
else
{
Debug.Fail("Unexpected type: " + o.GetType().ToString());
return("external");
}
}
//------------------------------------------------------------------------
// ToNode (internal type to internal type)
//------------------------------------------------------------------------
public static XPathNavigator ToNode(XPathItem item)
{
XsltLibrary.CheckXsltValue(item);
if (!item.IsNode)
{
// Create Navigator over text node containing string value of item
XPathDocument doc = new XPathDocument();
XmlRawWriter writer = doc.LoadFromWriter(XPathDocument.LoadFlags.AtomizeNames, string.Empty);
writer.WriteString(ToString(item));
writer.Close();
return(doc.CreateNavigator());
}
RtfNavigator?rtf = item as RtfNavigator;
if (rtf != null)
{
return(rtf.ToNavigator());
}
return((XPathNavigator)item);
}