public override bool Accepts(DataExp exp)
{
return(exp.dt.IsValid(literal, context) &&
(
exp.except == null ||
!Residual.Calc(exp.except, this, builder).IsNullable));
}
public Expression OnData(DataExp exp)
{
if (token.Accepts(exp))
{
return(Expression.Empty);
}
else
{
return(Expression.NotAllowed);
}
}
public override Expression OnData(DataExp exp)
{
return(Expression.NotAllowed);
}
public virtual Expression OnData(DataExp exp)
{
return(exp);
}
public void OnData(DataExp exp)
{
}
public virtual bool Accepts(DataExp exp)
{
return(false);
}
