public string Unescape()

in TeamCity.CSharpInteractive/MSBuildArgumentsTool.cs [10:43]

• 30 lines of code
• 7 McCabe index (conditional complexity)

    public string Unescape(string escaped)
    {
        if (string.IsNullOrEmpty(escaped))
        {
            return escaped;
        }

        var markerIndex = escaped.IndexOf(Marker);
        if (markerIndex == -1)
        {
            return escaped;
        }
        
        var unescaped = new StringBuilder(escaped.Length);
        var length = escaped.Length;
        var position = 0;
        while (markerIndex != -1)
        {
            if (
                markerIndex <= length - 3
                && TryDecode(escaped[markerIndex + 1], out var first)
                && TryDecode(escaped[markerIndex + 2], out var second))
            {
                unescaped.Append(escaped, position, markerIndex - position);
                unescaped.Append((char)((first << 4) + second));
                position = markerIndex + 3;
            }

            markerIndex = escaped.IndexOf(Marker, markerIndex + 1);
        }

        unescaped.Append(escaped, position, length - position);
        return unescaped.ToString();
    }