//------------------------------------------------------------------------------ // // 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 equality, so this should only be used in un-sorted data /// structures like Hashtable and ListDictionary. This is a little faster /// than using CaseInsensitiveComparer because it does a strict /// character-by-character equality check 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) == charRight) { continue; } } else if (catRight == UnicodeCategory.UppercaseLetter && catLeft == UnicodeCategory.LowercaseLetter){ if (Char.ToLower(charRight) == charLeft) { continue; } } return 1; } return 0; } } }