Made UpdateVariable work

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

@@ -7,12 +7,47 @@ namespace Advanced_Software_Engineering.Verbs.Value {
         protected string name;
         protected IValue value;
 
-        public UpdateVariable(Drawer drawer, string name, IValue value) {
+
+        private void Init(Drawer drawer, string name, IValue value) {
             this.name = name;
             this.value = value;
             this.drawer = drawer;
         }
 
+        public UpdateVariable(Drawer drawer, string name, IValue value) {
+            Init(drawer, name, value);
+        }
+
+        public UpdateVariable(Drawer drawer, string name, string value) {
+            // incoming values look something like this "= 10"
+            // or "= 10 + i"
+
+            //seperate assignment characters from everything else
+            foreach (string op in new string[] { "=", "+", "-", "*", "/" }) {
+                value = value.Replace(op, " " + op + " ");
+            }
+
+            value = HelperFunctions.Strip(value);
+            if (value[0] == "="[0]) {
+                value = value.Substring(1);
+            }
+            // now will definitly look like this:
+            // 10 + i or i
+
+            string[] assignmentStrings = HelperFunctions.StripStringArray(value.Split(" "[0])).ToArray();
+
+            // assignmentStrings will look something like this:
+            // ["i"] or ["10", "+", "i"]
+            if (assignmentStrings.Length == 1) Init(drawer, name, ValueFactory.CreateValue(drawer, assignmentStrings[0]));
+            else if (assignmentStrings.Length == 3) {
+                // assignmentStrings looks like this => ["10", "+", "i"]
+                IValue value1 = ValueFactory.CreateValue(drawer, assignmentStrings[0]);
+                string op = assignmentStrings[1];
+                IValue value2 = ValueFactory.CreateValue(drawer, assignmentStrings[2]);
+                Init(drawer, name, new ExpressionValue(value1, value2, op));
+            }
+        }
+
         public void ExecuteVerb() {
             if (!drawer.CheckVariableExists(name)) throw new Exception("Cannot update variable because it is not declared");
             drawer.SetVariable(name, value);

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

@@ -31,7 +31,7 @@ namespace Advanced_Software_Engineering {
             //check for names in directory
             if (drawer.CheckVariableExists(command)) {
                 if (commandParameters.Length == 1) {
-                    return new UpdateVariable(drawer, command, ValueFactory.CreateValue(drawer, commandParameters[0]));
+                    return new UpdateVariable(drawer, command, commandParameters[0]);
                 } else throw new Exception(command + "needs something to be assigned to it");
             }