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