75 lines
2.1 KiB
C#
75 lines
2.1 KiB
C#
using System;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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namespace IrcTokens
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{
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internal class Protocol
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{
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private static readonly string[] TagUnescaped =
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{
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"\\", " ", ";", "\r", "\n"
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};
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private static readonly string[] TagEscaped =
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{
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"\\\\", "\\s", "\\:", "\\r", "\\n"
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};
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/// <summary>
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/// Unescape ircv3 tag
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/// </summary>
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/// <param name="val">escaped string</param>
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/// <returns>unescaped string</returns>
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public static string UnescapeTag(string val)
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{
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var unescaped = new StringBuilder();
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var graphemeIterator = StringInfo.GetTextElementEnumerator(val);
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graphemeIterator.Reset();
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while (graphemeIterator.MoveNext())
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{
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var current = graphemeIterator.GetTextElement();
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if (current == @"\")
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{
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try
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{
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graphemeIterator.MoveNext();
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var next = graphemeIterator.GetTextElement();
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var pair = current + next;
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unescaped.Append(TagEscaped.Contains(pair)
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? TagUnescaped[Array.IndexOf(TagEscaped, pair)]
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: next);
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}
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catch (InvalidOperationException)
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{
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// ignored
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}
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}
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else
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unescaped.Append(current);
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}
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return unescaped.ToString();
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}
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/// <summary>
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/// Escape strings for use in ircv3 tags
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/// </summary>
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/// <param name="val">string to escape</param>
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/// <returns>escaped string</returns>
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public static string EscapeTag(string val)
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{
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for (var i = 0; i < TagUnescaped.Length; ++i)
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{
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val = val.Replace(TagUnescaped[i], TagEscaped[i], StringComparison.Ordinal);
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}
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return val;
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}
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}
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}
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