Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / BooleanFunctions.cs / 1 / BooleanFunctions.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- 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(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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