/// <summary>
/// Checks whether the message contains a specified mention prefix.
/// </summary>
/// <param name="msg">Message to check.</param>
/// <param name="user">User to check for.</param>
/// <returns>Positive number if the prefix is present, -1 otherwise.</returns>
public static int GetMentionPrefixLength(this DiscordMessage msg, DiscordUser user)
{
var cnt = msg.Content;
if (!cnt.StartsWith("<@"))
{
return(-1);
}
var cni = cnt.IndexOf('>');
if (cni == -1 || cnt.Length <= cni + 2)
{
return(-1);
}
var cnp = cnt.Substring(0, cni + 2);
var m = UserRegex.Match(cnp);
if (!m.Success)
{
return(-1);
}
var uid = ulong.Parse(m.Groups[1].Value, CultureInfo.InvariantCulture);
if (user.Id != uid)
{
return(-1);
}
int sn = 0;
for (var i = m.Value.Length; i < cnt.Length; i++)
{
if (char.IsWhiteSpace(cnt[i]))
{
sn++;
}
else
{
break;
}
}
return(m.Value.Length + sn);
}
public void Setup()
{
userRegex = new UserRegex();
}
