void CheckInt(Exp e)
{
if (e.ExpType != typeof(int))
{
if (e is VarExp && e.ExpType == typeof(void)) //Param Variable. Type unknown. Assume first occurence
{
e.ExpType = typeof(int);
CurrentFuncDef.Add(((VarExp)e).Name, typeof(int));
}
else if (e is DoVarExp && e.ExpType == typeof(void)) //Do Variable. Type unknown. Assume first occurence
{
e.ExpType = typeof(int);
DoVars.Add(((DoVarExp)e).Pos, typeof(int));
}
else if (e is CallExp && e.ExpType == typeof(void)) //Recursive function call. Assume first occurence
{
e.ExpType = typeof(int);
}
else if (!(e is CarExp)) //CarExp will be coerceto int
{
Console.WriteLine("Int expected");
success = false;
}
}
}
void CheckList(ref Exp e)
{
if (e.ExpType == typeof(int))
{
e = new ToListExp(e);
e.ExpType = typeof(CList);
}
if (e.ExpType != typeof(CList))
{
if (e is VarExp && e.ExpType == typeof(void))
{
e.ExpType = typeof(CList);
CurrentFuncDef.Add(((VarExp)e).Name, typeof(CList));
}
else if (e is DoVarExp && e.ExpType == typeof(void))
{
e.ExpType = typeof(CList);
DoVars.Add(((DoVarExp)e).Pos, typeof(CList));
}
else if (e is CallExp && e.ExpType == typeof(void)) //Recursive function call. Assume first occurence
{
e.ExpType = typeof(int);
}
else if (!(e is IntExp)) //IntExp will be coerceto List
{
Console.WriteLine("List expected");
success = false;
}
}
}
public void DoVarDef(DoVarDef e)
{
e.Init.Visit(this);
if (e.Init.ExpType != typeof(void)) //If type of init is known put it in.
{
if (DoVars[e.Pos] == null)
{
DoVars.Add(e.Pos, e.Init.ExpType); //Else DoVarExp will add typeof(void)
}
}
e.Iter.Visit(this);
if (e.Init.ExpType == typeof(void) && e.Init is VarExp) //If e.Init is VarExp which currently has no type.
{
e.Init.ExpType = (Type)DoVars[e.Pos]; //Assign it since now we know the type required.
CurrentFuncDef.Add(((VarExp)e.Init).Name, e.Init.ExpType);
}
if (e.Init.ExpType != e.Iter.ExpType)
{
Console.WriteLine("Do Expression: Init and Iterations have different type");
success = false;
}
}