Checks for bad names

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

@@ -8,6 +8,21 @@ namespace Advanced_Software_Engineering.Verbs.Value {
         private IValue value;
         private string name;
 
+        //Common characters that people might try
+        private char[] illegalCharacters = "1234567890!?/+- \"'@#~;:><,.`¬|[]{}\\£$%^&*()".ToCharArray();
+
+        /// <summary>
+        /// Checks if the name provided is valid
+        /// </summary>
+        /// <param name="name">The name of the variable</param>
+        /// <returns>True if the name is valid, otherwise false</returns>
+        private bool CheckName(string name) {
+            foreach(char character in illegalCharacters) {
+                if (name.Contains(character.ToString())) return false;
+            }
+            return true;
+        }
+
         public DeclareVariable(Drawer drawer, string type, string assignment) {
             this.drawer = drawer;
 
@@ -23,6 +38,7 @@ namespace Advanced_Software_Engineering.Verbs.Value {
                 List<string> assignmentList = SettingsAndHelperFunctions.StripStringArray(assignment.Split("="[0]));
                 name = assignmentList[0];
                 if (drawer.CheckVariableExists(name)) throw new Exception("Declaration failed. " + name + " has been declared before");
+                if (!CheckName(name)) throw new Exception("Name not allowed");
                 value = ValueFactory.CreateValue(assignmentList[1], type);
             } else {
                 //boolean here