Updated Interface

Advanced Software Engineering/Advanced Software Engineering/Verbs/Value/IValue.cs

@@ -16,5 +16,7 @@ namespace Advanced_Software_Engineering.Verbs.Value {
         Color ToColor();
 
         Type GetOriginalType();
+
+        bool isInitialised();
     }
 }

Advanced Software Engineering/Advanced Software Engineering/Verbs/Value/ValueTypes/BoolValue.cs

@@ -5,15 +5,22 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
 
     internal class BoolValue : IValue {
 
+        bool initialised = false;
+
         bool value;
         Type type = typeof(bool);
 
         public BoolValue(bool value) {
             this.value = value;
+            initialised = true;
+        }
+
+        public BoolValue() {
         }
 
         public string GetDescription() {
-            return "boolean of value " + value.ToString();
+            if (initialised) return "boolean of value " + value.ToString();
+            else return "an unset boolean value";
         }
 
         public Type GetOriginalType() {
@@ -21,19 +28,24 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
         }
 
         public bool ToBool() {
-            return value;
+            if (initialised) return value;
+            else throw new Exception("not initilised");
         }
 
         public Color ToColor() {
-            return value ? Color.White : Color.Black;
+            return ToBool() ? Color.White : Color.Black;
         }
 
         public double ToDouble() {
-            return value ? 1d : 0d;
+            return ToBool() ? 1d : 0d;
         }
 
         public int ToInt() {
-            return value ? 1 : 0;
+            return ToBool() ? 1 : 0;
+        }
+
+        public bool isInitialised() {
+            return initialised;
         }
     }
 }

Advanced Software Engineering/Advanced Software Engineering/Verbs/Value/ValueTypes/ColorValue.cs

@@ -5,15 +5,22 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
 
     internal class ColorValue : IValue {
 
+        bool initialised = false;
+
         Color value;
         Type type = typeof(Color);
 
         public ColorValue(Color value) {
             this.value = value;
+            initialised = true;
+        }
+
+        public ColorValue() {
         }
 
         public string GetDescription() {
-            return "A color with description " + value.ToString();
+            if (initialised) return "A color with description " + value.ToString();
+            else return "An uninitialised color";
         }
 
         public Type GetOriginalType() {
@@ -21,19 +28,24 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
         }
 
         public bool ToBool() {
-            return value.GetBrightness() > 0.5;
+            return ToColor().GetBrightness() > 0.5;
         }
 
         public Color ToColor() {
-            return value;
+            if (initialised) return value;
+            else throw new Exception("Color value not set");
         }
 
         public double ToDouble() {
-            return value.GetBrightness();
+            return ToColor().GetBrightness();
         }
 
         public int ToInt() {
-            return value.ToArgb();
+            return ToColor().ToArgb();
+        }
+
+        public bool isInitialised() {
+            return initialised;
         }
     }
 }

Advanced Software Engineering/Advanced Software Engineering/Verbs/Value/ValueTypes/DoubleValue.cs

@@ -5,6 +5,8 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
 
     internal class DoubleValue : IValue {
 
+        bool initialised = false;
+
         bool colorValueCacheAvailable = false;
         Color colorValueCache;
 
@@ -44,5 +46,9 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
         public int ToInt() {
             return (int)Math.Round(value);
         }
+
+        public bool isInitialised() {
+            return initialised;
+        }
     }
 }

Advanced Software Engineering/Advanced Software Engineering/Verbs/Value/ValueTypes/IntValue.cs

@@ -5,6 +5,8 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
 
     internal class IntValue : IValue {
 
+        bool initialised = false;
+
         int value;
 
         bool doubleValueCacheAvaiable = false;
@@ -60,5 +62,9 @@ namespace Advanced_Software_Engineering.Verbs.Value.ValueTypes {
         public int ToInt() {
             return value;
         }
+
+        public bool isInitialised() {
+            return initialised;
+        }
     }
 }

Advanced Software Engineering/Advanced Software Engineering/Verbs/VerbFactory.cs

@@ -203,9 +203,12 @@ namespace Advanced_Software_Engineering {
                     } else throw new Exception(command + " has an incorrect number of parameters");
 
                 case "int":
+                case "double":
+                case "bool":
+                case "color":
                     if (parameterLength == 1) {
-                        return new Verb
-                    } else throw new Exception("ints need to be initialised");
+                        return new InitialiseVariable(drawer, command, parameters[0]);
+                    } else throw new Exception(command + "s need to be initialised");
 
                 default:
                     throw new Exception("Unknown command");