public override object EvalConstLiteral()
{
// Eval left, quit if cant
var lhs = Lhs.EvalConstLiteral();
if (lhs == null)
{
return(null);
}
foreach (var t in Terms)
{
// Eval right, quit if cant
var rhs = t.Rhs.EvalConstLiteral();
if (rhs == null)
{
return(null);
}
// We don't like strings
if (lhs.GetType() == typeof(string) ||
rhs.GetType() == typeof(string))
{
return(null);
}
// Double?
if (lhs.GetType() == typeof(DoubleLiteral) &&
rhs.GetType() == typeof(DoubleLiteral))
{
lhs = Eval(((DoubleLiteral)lhs).Value, ((DoubleLiteral)rhs).Value, t.Op);
}
// Long?
if (lhs.GetType() == typeof(long) &&
rhs.GetType() == typeof(long))
{
lhs = Eval((long)lhs, (long)rhs, t.Op);
}
// Bool
if (lhs.GetType() == typeof(bool) &&
rhs.GetType() == typeof(bool))
{
lhs = Eval((bool)lhs, (bool)rhs, t.Op);
}
if (lhs == null)
{
return(null);
}
}
return(lhs);
}
public override object EvalConstLiteral()
{
// Eval right, quit if cant
var rhs = Rhs.EvalConstLiteral();
if (rhs == null)
{
return(null);
}
// Double?
if (rhs.GetType() == typeof(DoubleLiteral))
{
return(Eval(((DoubleLiteral)rhs).Value, Op));
}
// Long?
if (rhs.GetType() == typeof(long))
{
return(Eval((long)rhs, Op));
}
return(null);
}