74 lines
2.9 KiB
C#
74 lines
2.9 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="SymbolEqualComparer.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.Util
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{
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using System.Collections;
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using System.Globalization;
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//| <include file='doc\SymbolEqualComparer.uex' path='docs/doc[@for="SymbolEqualComparer"]/*' />
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/// <devdoc>
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/// <para>
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/// For internal use only. This implements a comparison that only
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/// checks for equality, so this should only be used in un-sorted data
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/// structures like Hashtable and ListDictionary. This is a little faster
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/// than using CaseInsensitiveComparer because it does a strict
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/// character-by-character equality check rather than a sorted comparison.
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/// </para>
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/// </devdoc>
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internal class SymbolEqualComparer: IComparer {
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//| <include file='doc\SymbolEqualComparer.uex' path='docs/doc[@for="SymbolEqualComparer.Default"]/*' />
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/// <devdoc>
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/// <para>[To be supplied.]</para>
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/// </devdoc>
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internal static readonly IComparer Default = new SymbolEqualComparer();
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internal SymbolEqualComparer() {
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}
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int IComparer.Compare(object keyLeft, object keyRight) {
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string sLeft = keyLeft as string;
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string sRight = keyRight as string;
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if (sLeft == null) {
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throw new ArgumentNullException("keyLeft");
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}
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if (sRight == null) {
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throw new ArgumentNullException("keyRight");
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}
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int lLeft = sLeft.Length;
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int lRight = sRight.Length;
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if (lLeft != lRight) {
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return 1;
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}
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for (int i = 0; i < lLeft; i++) {
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char charLeft = sLeft[i];
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char charRight = sRight[i];
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if (charLeft == charRight) {
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continue;
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}
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UnicodeCategory catLeft = Char.GetUnicodeCategory(charLeft);
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UnicodeCategory catRight = Char.GetUnicodeCategory(charRight);
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if (catLeft == UnicodeCategory.UppercaseLetter
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&& catRight == UnicodeCategory.LowercaseLetter) {
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if (Char.ToLower(charLeft) == charRight) {
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continue;
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}
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}
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else if (catRight == UnicodeCategory.UppercaseLetter
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&& catLeft == UnicodeCategory.LowercaseLetter){
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if (Char.ToLower(charRight) == charLeft) {
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continue;
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}
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}
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return 1;
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}
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return 0;
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}
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}
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}
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