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Imported Upstream version 4.6.0.125
Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
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//------------------------------------------------------------------------------
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// <copyright file="NumberFunctions.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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using System.Text;
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using FT = MS.Internal.Xml.XPath.Function.FunctionType;
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internal sealed class NumberFunctions : ValueQuery {
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private Query arg = null;
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private FT ftype;
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public NumberFunctions(FT ftype, Query arg) {
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this.arg = arg;
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this.ftype = ftype;
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}
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private NumberFunctions(NumberFunctions other) : base(other) {
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this.arg = Clone(other.arg);
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this.ftype = other.ftype;
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}
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public override void SetXsltContext(XsltContext context) {
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if (arg != null) {
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arg.SetXsltContext(context);
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}
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}
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internal static double Number(bool arg) {
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return arg ? 1.0 : 0.0;
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}
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internal static double Number(string arg) {
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return XmlConvert.ToXPathDouble(arg);
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}
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public override object Evaluate(XPathNodeIterator nodeIterator) {
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switch (ftype) {
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case FT.FuncNumber : return Number (nodeIterator);
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case FT.FuncSum : return Sum (nodeIterator);
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case FT.FuncFloor : return Floor (nodeIterator);
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case FT.FuncCeiling : return Ceiling(nodeIterator);
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case FT.FuncRound : return Round (nodeIterator);
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}
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return null;
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}
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private double Number(XPathNodeIterator nodeIterator) {
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if (arg == null) {
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return XmlConvert.ToXPathDouble(nodeIterator.Current.Value);
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}
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object argVal = arg.Evaluate(nodeIterator);
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switch (GetXPathType(argVal)) {
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case XPathResultType.NodeSet :
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XPathNavigator value = arg.Advance();
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if (value != null) {
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return Number(value.Value);
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}
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break;
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case XPathResultType.String :
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return Number((string)argVal);
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case XPathResultType.Boolean :
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return Number((bool) argVal);
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case XPathResultType.Number:
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return (double) argVal;
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case XPathResultType_Navigator:
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return Number(((XPathNavigator)argVal).Value);
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}
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return double.NaN;
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}
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private double Sum(XPathNodeIterator nodeIterator) {
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double sum = 0;
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arg.Evaluate(nodeIterator);
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XPathNavigator nav;
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while ((nav = arg.Advance()) != null) {
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sum += Number(nav.Value);
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}
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return sum;
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}
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private double Floor(XPathNodeIterator nodeIterator) {
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return Math.Floor((double) arg.Evaluate(nodeIterator));
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}
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private double Ceiling(XPathNodeIterator nodeIterator) {
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return Math.Ceiling((double) arg.Evaluate(nodeIterator));
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}
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private double Round(XPathNodeIterator nodeIterator) {
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double n = XmlConvert.ToXPathDouble(arg.Evaluate(nodeIterator));
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return XmlConvert.XPathRound(n);
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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 NumberFunctions(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("name", ftype.ToString());
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if (arg != null) {
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arg.PrintQuery(w);
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}
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w.WriteEndElement();
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}
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}
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}
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