public override SqlObject VisitOrder_by_clause(AntlrSqlParser.Order_by_clauseContext context)
{
Contract.Requires(context != null);
List <SqlOrderByItem> orderByItems = new List <SqlOrderByItem>();
foreach (AntlrSqlParser.Order_by_itemContext orderByItemContext in context.order_by_items().order_by_item())
{
SqlScalarExpression expression = (SqlScalarExpression)this.Visit(orderByItemContext.scalar_expression());
bool isDescending = false;
if (orderByItemContext.sort_order() != null)
{
if (orderByItemContext.sort_order().K_ASC() != null)
{
isDescending = false;
}
else if (orderByItemContext.sort_order().K_DESC() != null)
{
isDescending = true;
}
else
{
throw new ArgumentOutOfRangeException($"Unknown sort order : {orderByItemContext.sort_order()}.");
}
}
SqlOrderByItem orderByItem = SqlOrderByItem.Create(expression, isDescending);
orderByItems.Add(orderByItem);
}
return(SqlOrderbyClause.Create(orderByItems));
}
/// <summary>
/// Visit a parse tree produced by <see cref="AntlrSqlParser.order_by_clause"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitOrder_by_clause([NotNull] AntlrSqlParser.Order_by_clauseContext context)
{
return(VisitChildren(context));
}
