private GSCore execForeach(GSCoreCollection args)
{
if (args.Count < 4)
{
Debugger.Log(0, "", "Insufficient arguments for (FOREACH varName : list commands ) ");
return(null);
}
GSCore t1 = args.getSafe(0);
GSCore l1 = ExecuteElement(args.getSafe(2));
if (!(t1 is GSToken))
{
Debugger.Log(0, "", "Token shoudl be second argument in FOREACH ");
return(null);
}
if (!(l1 is GSList))
{
Debugger.Log(0, "", "List should be fourth argument in FOREACH ");
return(null);
}
GSToken tk = (GSToken)t1;
GSList lst = (GSList)l1;
GSCore r = null;
int ik = 0;
foreach (GSCore item in lst.Parts)
{
SetVariable(tk.Token, item);
for (int i = 3; i < args.Count; i++)
{
r = ExecuteElement(args.getSafe(i));
if (r is GSReturn)
{
break;
}
}
ik++;
if (r is GSReturn)
{
GSReturn ret = r as GSReturn;
if (ret.Type == GSReturn.TYPE_BREAK)
{
break;
}
if (ret.Type == GSReturn.TYPE_RETURN)
{
return(ret);
}
}
}
return(new GSInt64(ik));
}
/// <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);
}