Feature: added ability to check IWordMorpher can morph word; some opt…

…imization and refactoring.

Meerkat/Library/AdjectiveMorpher.cs

@@ -31,5 +31,24 @@ public override void Cache(string key)
 
 			cached.Add(key, adj);
 		}
+
+
+		public bool CanMorph(string word)
+		{
+			if (IsCached(word))
+				return true;
+			else
+			{
+				try
+				{
+					Cache(word);
+					return true;
+				}
+				catch (UnknownWordException)
+				{
+					return false;
+				}
+			}
+		}
 	}
 }

Meerkat/Library/Caching.cs

@@ -18,5 +18,11 @@ public T GetCached(string key)
 
 			return cached[key];
 		}
+
+
+		public bool IsCached(string key)
+		{
+			return cached.ContainsKey(key);
+		}
 	}
 }

Meerkat/Library/Interfaces/IWordMorpher.cs

@@ -6,5 +6,6 @@ namespace Meerkat.Library.Interfaces
 	public interface IWordMorpher
 	{
 		string Morph(string word, string command, string modifier);
+		bool CanMorph(string word);
 	}
 }

Meerkat/Library/NounMorpher.cs

@@ -48,5 +48,24 @@ public override void Cache(string key)
 
 			cached.Add(key, noun);
 		}
+
+
+		public bool CanMorph(string word)
+		{
+			if (IsCached(word))
+				return true;
+			else
+			{
+				try
+				{
+					Cache(word);
+					return true;
+				}
+				catch (UnknownWordException)
+				{
+					return false;
+				}
+			}
+		}
 	}
 }

Meerkat/Library/TemplateEngine.cs

@@ -77,34 +77,25 @@ public string ProcessSingle(string template)
 
 			if (Variables.ContainsKey(parsedVar))
 			{
-				string processedWord = "";
-				Exception exception = null;
+				var processedWord = string.Empty;
+				string word = Variables[parsedVar];
 
 				foreach (var morpher in wordMorphers)
 				{
-					try
+					if (morpher.CanMorph(word))
 					{
-						processedWord = morpher.Morph(
-							Variables[parsedVar],
-							command,
-							modifier);
-
-						exception = null;
+						processedWord = morpher.Morph(word, command, modifier);
 						break;
 					}
-					catch (UnknownWordException e)
-					{
-						exception = e;
-					}
 				}
 
-				if (exception == null)
+				if (processedWord != string.Empty)
 				{
 					processedWord = HandleUppercase(template, processedWord);
 					return processedWord;
 				}
 				else
-					throw exception;
+					throw new UnknownWordException(word);
 			}
 			else 
 			{