Game - add 'read' verb for Coin

sample/src/Coin.cs

@@ -6,8 +6,39 @@ namespace Adventure.Sample
 {
     internal sealed class Coin : Item
     {
+        private bool taken;
+
         public override string ShortDescription => "a coin";
 
         public override string LongDescription => "It is a small gold coin with an inscription on the edge.";
+
+        protected override bool TakeCore(MessageBus bus)
+        {
+            this.taken = true;
+            return base.TakeCore(bus);
+        }
+
+        protected override bool DoCore(MessageBus bus, Word verb, Word noun)
+        {
+            if (verb.Primary == Verb.Read)
+            {
+                this.Read(bus);
+                return true;
+            }
+
+            return base.DoCore(bus, verb, noun);
+        }
+
+        private void Read(MessageBus bus)
+        {
+            if (this.taken)
+            {
+                bus.Send(new OutputMessage("The inscription reads: \"MCMXCIX\""));
+            }
+            else
+            {
+                bus.Send(new OutputMessage("The writing is too small. You'd have to pick it up to see it better."));
+            }
+        }
     }
 }

sample/src/Game.cs

@@ -37,6 +37,7 @@ private static Words InitializeWords()
             w.Add(Verb.Look);
             w.Add(Verb.Move);
             w.Add(Verb.Quit, "exit");
+            w.Add(Verb.Read);
             w.Add(Verb.Take, "get");
             w.Add(Verb.Inventory, "inv");
 

sample/src/Verb.cs

@@ -12,5 +12,6 @@ internal static class Verb
         public const string Move = "move";
         public const string Take = "take";
         public const string Quit = "quit";
+        public const string Read = "read";
     }
 }

sample/test/walkthrough.in

@@ -14,7 +14,9 @@ look
 look coin
 get table
 inv
+read coin
 GET COIN
+read coin
 inv
 exit
 -- END --

sample/test/walkthrough.out

@@ -19,7 +19,9 @@ There is a coin here.
 > It is too heavy.
 > You are carrying:
 (nothing)
+> The writing is too small. You'd have to pick it up to see it better.
 > You GET the COIN.
+> The inscription reads: "MCMXCIX"
 > You are carrying:
 a coin
 >