/// <summary>
/// Executing element. For most of the elements in the program it is element itself,
/// but for the list it is result of executing operation that is mentioned in the head
/// of the list.
/// </summary>
/// <param name="E"></param>
/// <returns></returns>
public GSCore ExecuteElement(GSCore E)
{
if (E is GSList)
{
GSList L = (GSList)E;
if (L.Count == 0)
{
return(GSVoid.Void);
}
else if (L.Count == 1)
{
return(ExecuteElement(L[0]));
}
else
{
GSCore result = null;
GSCore target = ExecuteElement(L.Parts[0]);
string message = (L.Parts[1] is GSToken ? (L.Parts[1] as GSToken).Token : L.Parts[1].getStringValue());
if (target != null)
{
result = target.ExecuteMessage(message, L.Parts.getEvaluatedSublist(this, 2));
}
if (result == null)
{
return(new GSString());
}
return(result);
}
}
else if (E is GSToken)
{
GSToken t = E as GSToken;
if (t.Token.StartsWith("#"))
{
return(new GSString(t.Token));
}
return(EvaluateProperty(((GSToken)E).Token));
}
else
{
return(E);
}
}
private GSCore execMessage(GSCoreCollection args)
{
GSCore result = GSVoid.Void;
// first is token, name of variable, object
// second is token, message name
// third etc are arguments
if (args.Count >= 2 && args.getSafe(0) is GSToken && args.getSafe(1) is GSToken)
{
// evaluate the remaining portion of list
GSCoreCollection subArgs = getNativeValues(args.getSublist(2));
// first and second tokens
GSToken t1 = args.getSafe(0) as GSToken;
GSToken t2 = args.getSafe(1) as GSToken;
// evaluate reference to object
GSCore obj = ExecuteElement(t1);
// execute message in the object
result = obj.ExecuteMessage(t2.Token, subArgs);
}
return(result);
}
public override GSCore ExecuteMessage(string token, GSCoreCollection args)
{
GSCore result = null;
if (token.Equals("print"))
{
result = execPrint(args, false);
}
else if (token.Equals("println"))
{
result = execPrint(args, true);
}
else if (token.Equals("if"))
{
result = execIf(args);
}
else if (token.Equals("while"))
{
result = execWhile(args);
}
else if (token.Equals("foreach"))
{
result = execForeach(args);
}
else if (token.Equals("x"))
{
result = execMessage(args);
}
else if (token.Equals("do"))
{
result = execDo(args);
}
else if (token.Equals("return"))
{
result = new GSReturn(args.getSafe(0));
}
else if (token.Equals("break"))
{
result = new GSReturn(GSReturn.TYPE_BREAK);
}
else if (token.Equals("continue"))
{
result = new GSReturn(GSReturn.TYPE_CONTINUE);
}
else if (token.Equals("set") && args.Count > 1)
{
result = execSet(args[0], args[1]);
}
else if (token.Equals("random"))
{
result = execRandom(args);
}
else
{
if (token.IndexOf('.') >= 0)
{
string[] tp = token.Split('.');
GSCore obj = this;
for (int a = 0; a < tp.Length - 1; a++)
{
if (obj == null)
{
break;
}
obj = obj.GetPropertyValue(tp[a]);
}
if (obj != null)
{
return(obj.ExecuteMessage(tp[tp.Length - 1], args));
}
}
Debugger.Log(0, "", "UNKNOWN MESSAGE: " + token + " ");
}
return(result);
}
