Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / NumericExpr.cs / 1 / NumericExpr.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; internal sealed class NumericExpr : ValueQuery { private Operator.Op op; private Query opnd1; private Query opnd2; public NumericExpr(Operator.Op op, Query opnd1, Query opnd2) { Debug.Assert( op == Operator.Op.PLUS || op == Operator.Op.MINUS || op == Operator.Op.MUL || op == Operator.Op.DIV || op == Operator.Op.MOD ); Debug.Assert(opnd1 != null && opnd2 != null); if (opnd1.StaticType != XPathResultType.Number) { opnd1 = new NumberFunctions(Function.FunctionType.FuncNumber, opnd1); } if (opnd2.StaticType != XPathResultType.Number) { opnd2 = new NumberFunctions(Function.FunctionType.FuncNumber, opnd2); } this.op = op; this.opnd1 = opnd1; this.opnd2 = opnd2; } private NumericExpr(NumericExpr other) : base(other) { this.op = other.op; this.opnd1 = Clone(other.opnd1); this.opnd2 = Clone(other.opnd2); } public override void SetXsltContext(XsltContext context){ opnd1.SetXsltContext(context); opnd2.SetXsltContext(context); } public override object Evaluate(XPathNodeIterator nodeIterator) { return GetValue(this.op, XmlConvert.ToXPathDouble(opnd1.Evaluate(nodeIterator)), XmlConvert.ToXPathDouble(opnd2.Evaluate(nodeIterator)) ); } private static double GetValue(Operator.Op op, double n1, double n2) { Debug.Assert(op == Operator.Op.PLUS || op == Operator.Op.MINUS || op == Operator.Op.MOD || op == Operator.Op.DIV || op == Operator.Op.MUL); switch (op) { case Operator.Op.PLUS : return n1 + n2; case Operator.Op.MINUS : return n1 - n2; case Operator.Op.MOD : return n1 % n2; case Operator.Op.DIV : return n1 / n2; case Operator.Op.MUL : return n1 * n2; } return 0; } public override XPathResultType StaticType { get { return XPathResultType.Number; } } public override XPathNodeIterator Clone() { return new NumericExpr(this); } public override void PrintQuery(XmlWriter w) { w.WriteStartElement(this.GetType().Name); w.WriteAttributeString("op", op.ToString()); opnd1.PrintQuery(w); opnd2.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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