StringFunctions.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / XPath / Internal / StringFunctions.cs / 1305376 / 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 IList argList;

        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.
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StringFunctions.cs source code in C# .NET

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