44 lines
1.2 KiB
C#
44 lines
1.2 KiB
C#
using System;
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namespace IrcStates
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{
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public static class Casemap
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{
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public enum CaseMapping
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{
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Rfc1459,
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Ascii
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}
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private const string AsciiUpperChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private const string AsciiLowerChars = "abcdefghijklmnopqrstuvwxyz";
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private const string Rfc1459UpperChars = AsciiUpperChars + @"[]~\";
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private const string Rfc1459LowerChars = AsciiLowerChars + @"{}^|";
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private static string Replace(string s, string upper, string lower)
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{
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for (var i = 0; i < upper.Length; ++i)
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{
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s = s.Replace(upper[i], lower[i]);
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}
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return s;
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}
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public static string CaseFold(CaseMapping mapping, string s)
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{
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if (s != null)
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{
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return mapping switch
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{
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CaseMapping.Rfc1459 => Replace(s, Rfc1459UpperChars, Rfc1459LowerChars),
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CaseMapping.Ascii => Replace(s, AsciiUpperChars, AsciiLowerChars),
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_ => throw new ArgumentOutOfRangeException(nameof(mapping), mapping, null)
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};
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}
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return string.Empty;
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}
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}
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}
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