More DB staff and house keeping and better emoji

EventBot/Misc/EmoteHelper.cs

@@ -0,0 +1,79 @@
+using Discord;
+using System;
+
+namespace EventBot.Services
+{
+
+    public static class EmoteHelper
+    {
+        //private IEnumerable<string> emoji;
+
+        private static readonly int[] EmojiRanges =
+        {
+            0x1F600,0x1F64F, // Emoticons
+            0x1F300,0x1F5FF, // Misc Symbols and Pictographs
+            0x1F680,0x1F6FF, // Transport and Map
+            0x1F1E6,0x1F1FF, // Regional country flags
+            0x2600,0x26FF, // Misc symbols
+            0x2700,0x27BF, // Dingbats
+            0xE0020,0xE007F, // Tags
+            0xFE00,0xFE0F, // Variation Selectors
+            0x1F900,0x1F9FF, // Supplemental Symbols and Pictographs
+            0x1F018,0x1F270, // Various asian characters
+            0x238C,0x2454, // Misc items
+            0x20D0,0x20FF // Combining Diacritical Marks for Symbols
+        };
+
+        public static bool TryParse(string input, out IEmote emote)
+        {
+            if(Emote.TryParse(input, out Emote parsedEmote))
+            {
+                emote = parsedEmote;
+                return true;
+            }
+            if(isEmoji(input))
+            {
+                emote = new Emoji(input);
+                return true;
+            }
+            emote = null;
+            return false;
+        }
+
+        public static IEmote Parse(string input)
+        {
+            if (!TryParse(input, out IEmote parsed))
+                throw new ArgumentException("Failed to parse emote.");
+            return parsed;
+        }
+
+        public static bool isEmoji(string input)
+        {
+            if (input.Length % 2 == 1) {
+                return false;
+            }
+            for (var i = 0; i < input.Length; i += 2)
+            {
+                if (!char.IsSurrogatePair(input[i], input[i + 1]))
+                {
+                    return false;
+                }
+                var utf32 = char.ConvertToUtf32(input[i], input[i + 1]);
+                if (utf32 != 0x200D && !isEmojiChar(utf32))
+                {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+
+        public static bool isEmojiChar(int u32)
+        {;
+            for (int i = 0; i < EmojiRanges.Length; i+= 2)
+                if (u32 >= EmojiRanges[i] && u32 <= EmojiRanges[i + 1])
+                    return true;
+            return false;
+        }
+    }
+}