Add Support for emoji flags in the emoji converter

src/Core/Converters/EmojiConverter.cs

@@ -1,17 +1,12 @@
 using System.Collections;
+using System.Net.NetworkInformation;
 using System.Text;
 
 namespace Geekbot.Core.Converters
 {
     public class EmojiConverter : IEmojiConverter
     {
-        public string NumberToEmoji(int number)
+        private readonly string[] NumberEmojiMap =
-        {
-            if (number == 10)
-            {
-                return "🔟";
-            }
-            var emojiMap = new[]
         {
             ":zero:",
             ":one:",
@@ -24,18 +19,24 @@ namespace Geekbot.Core.Converters
             ":eight:",
             ":nine:"
         };
+
+        public string NumberToEmoji(int number)
+        {
+            if (number == 10)
+            {
+                return "🔟";
+            }
+
             var numbers = number.ToString().ToCharArray();
             var returnString = new StringBuilder();
             foreach (var n in numbers)
             {
-                returnString.Append(emojiMap[int.Parse(n.ToString())]);
+                returnString.Append(NumberEmojiMap[int.Parse(n.ToString())]);
             }
             return returnString.ToString();
         }
 
-        public string TextToEmoji(string text)
+        private readonly Hashtable TextEmojiMap = new Hashtable
-        {
-            var emojiMap = new Hashtable
         {
             ['A'] = ":regional_indicator_a: ",
             ['B'] = ":b: ",
@@ -80,11 +81,56 @@ namespace Geekbot.Core.Converters
             ['9'] = ":nine: ",
             [' '] = " "
         };
+        
+        public string TextToEmoji(string text)
+        {
             var letters = text.ToUpper().ToCharArray();
             var returnString = new StringBuilder();
             foreach (var n in letters)
             {
-                var emoji = emojiMap[n] ?? n;
+                var emoji = TextEmojiMap[n] ?? n;
+                returnString.Append(emoji);
+            }
+            return returnString.ToString();
+        }
+
+        private readonly Hashtable RegionalIndicatorMap = new Hashtable()
+        {
+            ['A'] = new Rune(0x1F1E6),
+            ['B'] = new Rune(0x1F1E7),
+            ['C'] = new Rune(0x1F1E8),
+            ['D'] = new Rune(0x1F1E9),
+            ['E'] = new Rune(0x1F1EA),
+            ['F'] = new Rune(0x1F1EB),
+            ['G'] = new Rune(0x1F1EC),
+            ['H'] = new Rune(0x1F1ED),
+            ['I'] = new Rune(0x1F1EE),
+            ['J'] = new Rune(0x1F1EF),
+            ['K'] = new Rune(0x1F1F0),
+            ['L'] = new Rune(0x1F1F1),
+            ['M'] = new Rune(0x1F1F2),
+            ['N'] = new Rune(0x1F1F3),
+            ['O'] = new Rune(0x1F1F4),
+            ['P'] = new Rune(0x1F1F5),
+            ['Q'] = new Rune(0x1F1F6),
+            ['R'] = new Rune(0x1F1F7),
+            ['S'] = new Rune(0x1F1F8),
+            ['T'] = new Rune(0x1F1F9),
+            ['U'] = new Rune(0x1F1FA),
+            ['V'] = new Rune(0x1F1FB),
+            ['W'] = new Rune(0x1F1FC),
+            ['X'] = new Rune(0x1F1FD),
+            ['Y'] = new Rune(0x1F1FE),
+            ['Z'] = new Rune(0x1F1FF)
+        };
+        
+        public string CountryCodeToEmoji(string countryCode)
+        {
+            var letters = countryCode.ToUpper().ToCharArray();
+            var returnString = new StringBuilder();
+            foreach (var n in letters)
+            {
+                var emoji = RegionalIndicatorMap[n];
                 returnString.Append(emoji);
             }
             return returnString.ToString();

src/Core/Converters/IEmojiConverter.cs

@@ -4,5 +4,6 @@
     {
         string NumberToEmoji(int number);
         string TextToEmoji(string text);
+        string CountryCodeToEmoji(string countryCode);
     }
 }