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//------------------------------------------------------------------------------
// <copyright file="NodeFunctions.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
//------------------------------------------------------------------------------
namespace MS.Internal.Xml.XPath {
using System;
using System.Xml;
using System.Xml.XPath;
using System.Diagnostics;
using System.Globalization;
using System.Xml.Xsl;
using FT = MS.Internal.Xml.XPath.Function.FunctionType;
internal sealed class NodeFunctions : ValueQuery {
Query arg = null;
FT funcType;
XsltContext xsltContext;
public NodeFunctions(FT funcType, Query arg) {
this.funcType = funcType;
this.arg = arg;
}
public override void SetXsltContext(XsltContext context){
this.xsltContext = context.Whitespace ? context : null;
if (arg != null) {
arg.SetXsltContext(context);
}
}
private XPathNavigator EvaluateArg(XPathNodeIterator context) {
if (arg == null) {
return context.Current;
}
arg.Evaluate(context);
return arg.Advance();
}
public override object Evaluate(XPathNodeIterator context) {
XPathNavigator argVal;
switch (funcType) {
case FT.FuncPosition:
return (double)context.CurrentPosition;
case FT.FuncLast:
return (double)context.Count;
case FT.FuncNameSpaceUri:
argVal = EvaluateArg(context);
if (argVal != null) {
return argVal.NamespaceURI;
}
break;
case FT.FuncLocalName:
argVal = EvaluateArg(context);
if (argVal != null) {
return argVal.LocalName;
}
break;
case FT.FuncName :
argVal = EvaluateArg(context);
if (argVal != null) {
return argVal.Name;
}
break;
case FT.FuncCount:
arg.Evaluate(context);
int count = 0;
if (xsltContext != null) {
XPathNavigator nav;
while ((nav = arg.Advance()) != null) {
if (nav.NodeType != XPathNodeType.Whitespace || xsltContext.PreserveWhitespace(nav)) {
count++;
}
}
} else {
while (arg.Advance() != null) {
count++;
}
}
return (double) count;
}
return string.Empty;
}
public override XPathResultType StaticType { get { return Function.ReturnTypes[(int)funcType]; } }
public override XPathNodeIterator Clone() {
NodeFunctions method = new NodeFunctions(funcType, Clone(arg));
method.xsltContext = this.xsltContext;
return method;
}
public override void PrintQuery(XmlWriter w) {
w.WriteStartElement(this.GetType().Name);
w.WriteAttributeString("name", funcType.ToString());
if (arg != null) {
arg.PrintQuery(w);
}
w.WriteEndElement();
}
}
}
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