SymbolEqualComparer.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / SymbolEqualComparer.cs / 1 / SymbolEqualComparer.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.Util { 
    using System.Collections; 
    using System.Globalization;
 

    /// 
    ///  
    ///    For internal use only. This implements a comparison that only 
    ///    checks for equalilty, so this should only be used in un-sorted data
    ///    structures like Hastable and ListDictionary. This is a little faster 
    ///    than using CaseInsensitiveComparer because it does a strict character by 
    ///    character equality chech rather than a sorted comparison.
    ///   
    /// 
    internal class SymbolEqualComparer: IComparer {

 
        /// 
        ///    [To be supplied.] 
        ///  
        internal static readonly IComparer Default = new SymbolEqualComparer();
 
        internal SymbolEqualComparer() {
        }

        int IComparer.Compare(object keyLeft, object keyRight) { 

            string sLeft = keyLeft as string; 
            string sRight = keyRight as string; 
            if (sLeft == null) {
                throw new ArgumentNullException("keyLeft"); 
            }
            if (sRight == null) {
                throw new ArgumentNullException("keyRight");
            } 
            int lLeft = sLeft.Length;
            int lRight = sRight.Length; 
            if (lLeft != lRight) { 
                return 1;
            } 
            for (int i = 0; i < lLeft; i++) {
                char charLeft = sLeft[i];
                char charRight = sRight[i];
                if (charLeft == charRight) { 
                    continue;
                } 
                UnicodeCategory catLeft = Char.GetUnicodeCategory(charLeft); 
                UnicodeCategory catRight = Char.GetUnicodeCategory(charRight);
                if (catLeft == UnicodeCategory.UppercaseLetter 
                    && catRight == UnicodeCategory.LowercaseLetter) {
                    if (Char.ToLower(charLeft, CultureInfo.InvariantCulture) == charRight) {
                        continue;
                    } 
                } else if (catRight == UnicodeCategory.UppercaseLetter
                    && catLeft == UnicodeCategory.LowercaseLetter){ 
                    if (Char.ToLower(charRight, CultureInfo.InvariantCulture) == charLeft) { 
                        continue;
                    } 
                }
                return 1;
            }
            return 0; 
        }
    } 
}

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