static public object Eval(object form)
{
Cons pair = form as Cons;
if (pair != null)
{
object op = pair.Car;
object operands = pair.Cdr;
object sym = op as Symbol;
if (sym != null)
{
return(CL.Apply(CL.SymbolFunction(sym), Evlis(operands)));
}
else
{
throw new NotImplementedException("Operator not a symbol");
}
}
else
{
Symbol identifier = form as Symbol;
if (identifier != null)
{
return(CL.SymbolValue(form));
}
else
{
string literal = form as String;
if (literal != null)
{
return(literal);
}
else
{
throw new NotImplementedException("No lambda functions yet");
}
}
}
}
