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//------------------------------------------------------------------------------
// <copyright file="BooleanFunctions.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</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 BooleanFunctions : ValueQuery {
Query arg;
FT funcType;
public BooleanFunctions(FT funcType, Query arg) {
this.arg = arg;
this.funcType = funcType;
}
private BooleanFunctions(BooleanFunctions other) : base(other) {
this.arg = Clone(other.arg);
this.funcType = other.funcType;
}
public override void SetXsltContext(XsltContext context) {
if (arg != null) {
arg.SetXsltContext(context);
}
}
public override object Evaluate(XPathNodeIterator nodeIterator) {
switch (funcType) {
case FT.FuncBoolean : return toBoolean(nodeIterator);
case FT.FuncNot : return Not(nodeIterator);
case FT.FuncTrue : return true;
case FT.FuncFalse : return false;
case FT.FuncLang : return Lang(nodeIterator);
}
return false;
}
internal static bool toBoolean(double number) {
return number != 0 && ! double.IsNaN(number);
}
internal static bool toBoolean(string str) {
return str.Length > 0;
}
internal bool toBoolean(XPathNodeIterator nodeIterator) {
object result = arg.Evaluate(nodeIterator);
if (result is XPathNodeIterator) return arg.Advance() != null;
if (result is string ) return toBoolean((string)result);
if (result is double ) return toBoolean((double)result);
if (result is bool ) return (bool)result;
Debug.Assert(result is XPathNavigator, "Unknown value type");
return true;
}
public override XPathResultType StaticType { get { return XPathResultType.Boolean; } }
private bool Not(XPathNodeIterator nodeIterator) {
return ! (bool) arg.Evaluate(nodeIterator);
}
private bool Lang(XPathNodeIterator nodeIterator) {
string str = arg.Evaluate(nodeIterator).ToString();
string lang = nodeIterator.Current.XmlLang;
return (
lang.StartsWith(str, StringComparison.OrdinalIgnoreCase) &&
(lang.Length == str.Length || lang[str.Length] == '-')
);
}
public override XPathNodeIterator Clone() { return new BooleanFunctions(this); }
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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