Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / StringFunctions.cs / 1 / StringFunctions.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace MS.Internal.Xml.XPath { using System; using System.Globalization; using System.Text; using System.Xml; using System.Xml.XPath; using System.Xml.Xsl; using System.Collections.Generic; using System.Diagnostics; internal sealed class StringFunctions : ValueQuery { Function.FunctionType funcType; private IListargList; public StringFunctions(Function.FunctionType funcType, IList argList) { Debug.Assert(argList != null, "Use 'new Query[]{}' instead."); this.funcType = funcType; this.argList = argList; } private StringFunctions(StringFunctions other) : base(other) { this.funcType = other.funcType; Query[] tmp = new Query[other.argList.Count]; { for (int i = 0; i < tmp.Length; i ++) { tmp[i] = Clone(other.argList[i]); } } this.argList = tmp; } public override void SetXsltContext(XsltContext context){ for (int i = 0; i < argList.Count; i++) { argList[i].SetXsltContext(context); } } public override object Evaluate(XPathNodeIterator nodeIterator) { switch (funcType) { case Function.FunctionType.FuncString : return toString(nodeIterator); case Function.FunctionType.FuncConcat : return Concat(nodeIterator); case Function.FunctionType.FuncStartsWith : return StartsWith(nodeIterator); case Function.FunctionType.FuncContains : return Contains(nodeIterator); case Function.FunctionType.FuncSubstringBefore : return SubstringBefore(nodeIterator); case Function.FunctionType.FuncSubstringAfter : return SubstringAfter(nodeIterator); case Function.FunctionType.FuncSubstring : return Substring(nodeIterator); case Function.FunctionType.FuncStringLength : return StringLength(nodeIterator); case Function.FunctionType.FuncNormalize : return Normalize(nodeIterator); case Function.FunctionType.FuncTranslate : return Translate(nodeIterator); } return string.Empty; } internal static string toString(double num) { return num.ToString("R", NumberFormatInfo.InvariantInfo); } internal static string toString(bool b) { return b ? "true" : "false"; } private string toString(XPathNodeIterator nodeIterator) { if (argList.Count > 0) { object argVal = argList[0].Evaluate(nodeIterator); switch (GetXPathType(argVal)) { case XPathResultType.NodeSet: XPathNavigator value = argList[0].Advance(); return value != null ? value.Value : string.Empty; case XPathResultType.String: return (string) argVal; case XPathResultType.Boolean : return ((bool) argVal) ? "true" : "false"; case XPathResultType_Navigator: return ((XPathNavigator)argVal).Value; default: Debug.Assert(GetXPathType(argVal) == XPathResultType.Number); return toString((double)argVal); } } return nodeIterator.Current.Value; } public override XPathResultType StaticType { get { if (funcType == Function.FunctionType.FuncStringLength) { return XPathResultType.Number; } if ( funcType == Function.FunctionType.FuncStartsWith || funcType == Function.FunctionType.FuncContains ) { return XPathResultType.Boolean; } return XPathResultType.String; } } private string Concat(XPathNodeIterator nodeIterator) { int count = 0; StringBuilder s = new StringBuilder(); while (count < argList.Count) { s.Append(argList[count++].Evaluate(nodeIterator).ToString()); } return s.ToString(); } private bool StartsWith(XPathNodeIterator nodeIterator) { string s1 = argList[0].Evaluate(nodeIterator).ToString(); string s2 = argList[1].Evaluate(nodeIterator).ToString(); return s1.Length >= s2.Length && string.CompareOrdinal(s1, 0, s2, 0, s2.Length) == 0; } private static readonly CompareInfo compareInfo = CultureInfo.InvariantCulture.CompareInfo; private bool Contains(XPathNodeIterator nodeIterator) { string s1 = argList[0].Evaluate(nodeIterator).ToString(); string s2 = argList[1].Evaluate(nodeIterator).ToString(); return compareInfo.IndexOf(s1, s2, CompareOptions.Ordinal) >= 0; } private string SubstringBefore(XPathNodeIterator nodeIterator) { string s1 = argList[0].Evaluate(nodeIterator).ToString(); string s2 = argList[1].Evaluate(nodeIterator).ToString(); if (s2.Length == 0) { return s2; } int idx = compareInfo.IndexOf(s1, s2, CompareOptions.Ordinal); return (idx < 1) ? string.Empty : s1.Substring(0, idx); } private string SubstringAfter(XPathNodeIterator nodeIterator) { string s1 = argList[0].Evaluate(nodeIterator).ToString(); string s2 = argList[1].Evaluate(nodeIterator).ToString(); if (s2.Length == 0) { return s1; } int idx = compareInfo.IndexOf(s1, s2, CompareOptions.Ordinal); return (idx < 0) ? string.Empty : s1.Substring(idx + s2.Length); } private string Substring(XPathNodeIterator nodeIterator) { string str1 = argList[0].Evaluate(nodeIterator).ToString(); double num = XmlConvert.XPathRound(XmlConvert.ToXPathDouble(argList[1].Evaluate(nodeIterator))) - 1 ; if (Double.IsNaN(num) || str1.Length <= num) { return string.Empty; } if (argList.Count == 3) { double num1 = XmlConvert.XPathRound(XmlConvert.ToXPathDouble(argList[2].Evaluate(nodeIterator))); if (Double.IsNaN(num1)) { return string.Empty; } if (num < 0 || num1 < 0 ) { num1 = num + num1 ; // NOTE: condition is true for NaN if (!(num1 > 0)) { return string.Empty; } num = 0; } double maxlength = str1.Length - num; if (num1 > maxlength) { num1 = maxlength; } return str1.Substring((int)num ,(int)num1); } if (num < 0) { num = 0; } return str1.Substring((int)num); } private Double StringLength(XPathNodeIterator nodeIterator) { if (argList.Count > 0) { return argList[0].Evaluate(nodeIterator).ToString().Length; } return nodeIterator.Current.Value.Length; } private string Normalize(XPathNodeIterator nodeIterator) { string str1; if (argList.Count > 0) { str1 = argList[0].Evaluate(nodeIterator).ToString(); } else { str1 = nodeIterator.Current.Value; } str1 = XmlConvert.TrimString(str1); int count = 0; StringBuilder str2 = new StringBuilder(); bool FirstSpace = true; XmlCharType xmlCharType = XmlCharType.Instance; while (count < str1.Length) { if (!xmlCharType.IsWhiteSpace(str1[count])) { FirstSpace = true; str2.Append(str1[count]); } else if (FirstSpace) { FirstSpace = false; str2.Append(' '); } count++; } return str2.ToString(); } private string Translate(XPathNodeIterator nodeIterator) { string str1 = argList[0].Evaluate(nodeIterator).ToString(); string str2 = argList[1].Evaluate(nodeIterator).ToString(); string str3 = argList[2].Evaluate(nodeIterator).ToString(); int count = 0, index; StringBuilder str = new StringBuilder(); while (count < str1.Length) { index = str2.IndexOf(str1[count]); if (index != -1) { if (index < str3.Length) { str.Append(str3[index]); } } else { str.Append(str1[count]); } count++; } return str.ToString(); } public override XPathNodeIterator Clone() { return new StringFunctions(this); } public override void PrintQuery(XmlWriter w) { w.WriteStartElement(this.GetType().Name); w.WriteAttributeString("name", funcType.ToString()); foreach(Query arg in this.argList) { arg.PrintQuery(w); } w.WriteEndElement(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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