80 lines
3.1 KiB
C#
80 lines
3.1 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="NumericExpr.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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//------------------------------------------------------------------------------
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namespace MS.Internal.Xml.XPath {
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using System;
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using System.Xml;
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using System.Xml.XPath;
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using System.Diagnostics;
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using System.Globalization;
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using System.Xml.Xsl;
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internal sealed class NumericExpr : ValueQuery {
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private Operator.Op op;
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private Query opnd1;
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private Query opnd2;
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public NumericExpr(Operator.Op op, Query opnd1, Query opnd2) {
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Debug.Assert(
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op == Operator.Op.PLUS || op == Operator.Op.MINUS ||
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op == Operator.Op.MUL || op == Operator.Op.DIV ||
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op == Operator.Op.MOD
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);
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Debug.Assert(opnd1 != null && opnd2 != null);
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if (opnd1.StaticType != XPathResultType.Number) {
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opnd1 = new NumberFunctions(Function.FunctionType.FuncNumber, opnd1);
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}
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if (opnd2.StaticType != XPathResultType.Number) {
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opnd2 = new NumberFunctions(Function.FunctionType.FuncNumber, opnd2);
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}
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this.op = op;
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this.opnd1 = opnd1;
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this.opnd2 = opnd2;
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}
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private NumericExpr(NumericExpr other) : base(other) {
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this.op = other.op;
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this.opnd1 = Clone(other.opnd1);
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this.opnd2 = Clone(other.opnd2);
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}
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public override void SetXsltContext(XsltContext context){
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opnd1.SetXsltContext(context);
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opnd2.SetXsltContext(context);
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}
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public override object Evaluate(XPathNodeIterator nodeIterator) {
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return GetValue(this.op,
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XmlConvert.ToXPathDouble(opnd1.Evaluate(nodeIterator)),
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XmlConvert.ToXPathDouble(opnd2.Evaluate(nodeIterator))
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);
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}
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private static double GetValue(Operator.Op op, double n1, double n2) {
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Debug.Assert(op == Operator.Op.PLUS || op == Operator.Op.MINUS || op == Operator.Op.MOD || op == Operator.Op.DIV || op == Operator.Op.MUL);
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switch (op) {
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case Operator.Op.PLUS : return n1 + n2;
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case Operator.Op.MINUS : return n1 - n2;
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case Operator.Op.MOD : return n1 % n2;
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case Operator.Op.DIV : return n1 / n2;
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case Operator.Op.MUL : return n1 * n2;
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}
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return 0;
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}
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public override XPathResultType StaticType { get { return XPathResultType.Number; } }
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public override XPathNodeIterator Clone() { return new NumericExpr(this); }
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public override void PrintQuery(XmlWriter w) {
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w.WriteStartElement(this.GetType().Name);
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w.WriteAttributeString("op", op.ToString());
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opnd1.PrintQuery(w);
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opnd2.PrintQuery(w);
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w.WriteEndElement();
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}
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}
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}
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