Reworked the mention system

src/Discord.Net/DiscordClient.Messages.cs

@@ -93,7 +93,6 @@ namespace Discord
 		{
 			if (channel == null) throw new ArgumentNullException(nameof(channel));
 			if (text == null) throw new ArgumentNullException(nameof(text));
-			if (text.Length > MaxMessageSize) throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
 			CheckReady();
 
 			return SendMessage(channel, text, false);
@@ -103,7 +102,6 @@ namespace Discord
 		{
 			if (channel == null) throw new ArgumentNullException(nameof(channel));
 			if (text == null) throw new ArgumentNullException(nameof(text));
-			if (text.Length > MaxMessageSize) throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
 			CheckReady();
 
 			return SendMessage(channel, text, false);
@@ -113,7 +111,6 @@ namespace Discord
 		{
 			if (user == null) throw new ArgumentNullException(nameof(user));
 			if (text == null) throw new ArgumentNullException(nameof(text));
-			if (text.Length > MaxMessageSize) throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
             CheckReady();
 
 			var channel = await CreatePMChannel(user).ConfigureAwait(false);
@@ -122,10 +119,10 @@ namespace Discord
 		private async Task<Message> SendMessage(Channel channel, string text, bool isTextToSpeech)
 		{
 			Message msg;
-			var userIds = !channel.IsPrivate ? Mention.GetUserIds(text).Distinct() : new string[0];
+			var server = channel.Server;
+
 			if (Config.UseMessageQueue)
 			{
-				var channelIds = !channel.IsPrivate ? Mention.GetChannelIds(text).Distinct() : new string[0];
 				var nonce = GenerateNonce();
 				msg = _messages.GetOrAdd("nonce_" + nonce, channel.Id, _userId);
                 var currentUser = msg.User;
@@ -140,21 +137,21 @@ namespace Discord
 				msg.Nonce = nonce;
 				msg.IsQueued = true;
 
-				//IsPrivate check is already done earlier
-				msg.MentionedUsers = userIds
-					.Select(x => _users[x, channel.Server.Id])
-					.Where(x => x != null)
-					.ToArray();
-				msg.MentionedChannels = channelIds
-					.Select(x => _channels[x])
-					.Where(x => x != null && x.Server == channel.Server)
-					.ToArray();
+				if (text.Length > MaxMessageSize)
+					throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
 
 				_pendingMessages.Enqueue(msg);
 			}
 			else
 			{
-				var model = await _api.SendMessage(channel.Id, text, userIds, null, isTextToSpeech).ConfigureAwait(false);
+				var mentionedUsers = new List<User>();
+				if (!channel.IsPrivate)
+					text = Mention.CleanUserMentions(this, server, text, mentionedUsers);
+
+				if (text.Length > MaxMessageSize)
+					throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
+
+				var model = await _api.SendMessage(channel.Id, text, mentionedUsers.Select(x => x.Id), null, isTextToSpeech).ConfigureAwait(false);
 				msg = _messages.GetOrAdd(model.Id, channel.Id, model.Author.Id);
 				msg.Update(model);
 				RaiseMessageSent(msg);
@@ -179,13 +176,17 @@ namespace Discord
 		{
 			if (message == null) throw new ArgumentNullException(nameof(message));
 			if (text == null) throw new ArgumentNullException(nameof(text));
-			if (text.Length > MaxMessageSize) throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
 			CheckReady();
 
-			if (text != null && text.Length > MaxMessageSize)
-				text = text.Substring(0, MaxMessageSize);
+			var channel = message.Channel;
+			var mentionedUsers = new List<User>();
+			if (!channel.IsPrivate)
+				text = Mention.CleanUserMentions(this, channel.Server, text, mentionedUsers);
 
-			return _api.EditMessage(message.Id, message.Channel.Id, text, Mention.GetUserIds(text));
+			if (text.Length > MaxMessageSize)
+				throw new ArgumentOutOfRangeException(nameof(text), $"Message must be {MaxMessageSize} characters or less.");
+
+			return _api.EditMessage(message.Id, message.Channel.Id, text, mentionedUsers.Select(x => x.Id));
 		}
 
 		/// <summary> Deletes the provided message. </summary>

src/Discord.Net/Helpers/Mention.cs

@@ -8,6 +8,7 @@ namespace Discord
 	{
 		private static readonly Regex _userRegex = new Regex(@"<@([0-9]+?)>", RegexOptions.Compiled);
 		private static readonly Regex _channelRegex = new Regex(@"<#([0-9]+?)>", RegexOptions.Compiled);
+		private static readonly Regex _roleRegex = new Regex(@"@everyone", RegexOptions.Compiled);
 
 		/// <summary> Returns the string used to create a user mention. </summary>
 		public static string User(User user)
@@ -19,45 +20,45 @@ namespace Discord
 		public static string Everyone()
 			=> $"@everyone";
 
-		internal static string ConvertToNames(DiscordClient client, Server server, string text)
+		internal static string CleanUserMentions(DiscordClient client, Server server, string text, List<User> users = null)
 		{
-			text = _userRegex.Replace(text, new MatchEvaluator(e =>
+			return _userRegex.Replace(text, new MatchEvaluator(e =>
 			{
 				string id = e.Value.Substring(2, e.Value.Length - 3);
 				var user = client.Users[id, server?.Id];
 				if (user != null)
+				{
+					if (users != null)
+						users.Add(user);
 					return '@' + user.Name;
+				}
 				else //User not found
 					return '@' + e.Value;
 			}));
-			if (server != null)
+		}
+		internal static string CleanChannelMentions(DiscordClient client, Server server, string text, List<Channel> channels = null)
+		{
+			return _channelRegex.Replace(text, new MatchEvaluator(e =>
 			{
-				text = _channelRegex.Replace(text, new MatchEvaluator(e =>
+				string id = e.Value.Substring(2, e.Value.Length - 3);
+				var channel = client.Channels[id];
+				if (channel != null && channel.Server.Id == server.Id)
 				{
-					string id = e.Value.Substring(2, e.Value.Length - 3);
-					var channel = client.Channels[id];
-					if (channel != null && channel.Server.Id == server.Id)
-						return '#' + channel.Name;
-					else //Channel not found
+					if (channels != null)
+						channels.Add(channel);
+					return '#' + channel.Name;
+				}
+				else //Channel not found
 					return '#' + e.Value;
-				}));
-			}
-			return text;
+			}));
 		}
-
-		internal static IEnumerable<string> GetUserIds(string text)
+		internal static string CleanRoleMentions(DiscordClient client, Server server, string text, List<Role> roles = null)
 		{
-			return _userRegex.Matches(text)
-				.OfType<Match>()
-				.Select(x => x.Groups[1].Value)
-				.Where(x => x != null);
-		}
-		internal static IEnumerable<string> GetChannelIds(string text)
-		{
-			return _channelRegex.Matches(text)
-				.OfType<Match>()
-				.Select(x => x.Groups[1].Value)
-				.Where(x => x != null);
+			return _roleRegex.Replace(text, new MatchEvaluator(e =>
+			{
+				roles.Add(server.EveryoneRole);
+				return e.Value;
+			}));
 		}
 	}
 }

src/Discord.Net/Models/Message.cs

@@ -90,9 +90,7 @@ namespace Discord
 				Height = height;
 			}
 		}
-
-		private string _cleanText;
-		
+				
 		/// <summary> Returns the local unique identifier for this message. </summary>
 		public string Nonce { get; internal set; }
 
@@ -110,8 +108,7 @@ namespace Discord
 		/// <summary> Returns the raw content of this message as it was received from the server.. </summary>
 		public string RawText { get; private set; }
 		/// <summary> Returns the content of this message with any special references such as mentions converted. </summary>
-		/// <remarks> This value is lazy loaded and only processed on first request. Each subsequent request will pull from cache. </remarks>
-		public string Text => _cleanText != null ? _cleanText : (_cleanText = Mention.ConvertToNames(_client, Server, RawText));
+		public string Text { get; private set; } 
 		/// <summary> Returns the timestamp for when this message was sent. </summary>
 		public DateTime Timestamp { get; private set; }
 		/// <summary> Returns the timestamp for when this message was last edited. </summary>
@@ -131,6 +128,10 @@ namespace Discord
 		[JsonIgnore]
 		public IEnumerable<Channel> MentionedChannels { get; internal set; }
 
+		/// <summary> Returns a collection of all roles mentioned in this message. </summary>
+		[JsonIgnore]
+		public IEnumerable<Role> MentionedRoles { get; internal set; }
+
 		/// <summary> Returns the server containing the channel this message was sent to. </summary>
 		[JsonIgnore]
 		public Server Server => _channel.Value.Server;
@@ -220,18 +221,23 @@ namespace Discord
 			}
 			if (model.Content != null)
 			{
-				RawText = model.Content;
-				_cleanText = null;
-				
-				if (!Channel.IsPrivate)
+				var server = Server;
+				string text = model.Content;
+				RawText = text;
+
+				//var mentionedUsers = new List<User>();
+				var mentionedChannels = new List<Channel>();
+				var mentionedRoles = new List<Role>();
+				text = Mention.CleanUserMentions(_client, server, text/*, mentionedUsers*/);
+				if (server != null)
 				{
-					MentionedChannels = Mention.GetChannelIds(model.Content)
-						.Select(x => _client.Channels[x])
-						.Where(x => x.Server == Channel.Server)
-						.ToArray();
+					text = Mention.CleanChannelMentions(_client, server, text, mentionedChannels);
+					text = Mention.CleanRoleMentions(_client, server, text, mentionedRoles);
 				}
-				else
-					MentionedChannels = new Channel[0];
+
+				//MentionedUsers = mentionedUsers;
+				MentionedChannels = mentionedChannels;
+				MentionedRoles = mentionedRoles;
 			}
 		}