public override object VisitOrder_by_element([NotNull] KoraliumParser.Order_by_elementContext context)
{
var scalarExpressionNode = context.scalar;
if (scalarExpressionNode != null)
{
var scalarExpression = Visit(scalarExpressionNode) as ScalarExpression;
if (scalarExpression == null)
{
throw new SqlParserException("Could not find a scalar expression in order by element");
}
bool ascending = true;
if (context.order != null)
{
switch (context.order.Text.ToLower())
{
case "asc":
ascending = true;
break;
case "desc":
ascending = false;
break;
}
}
return(new OrderExpression()
{
Ascending = ascending,
Expression = scalarExpression
});
}
if (context.query != null)
{
return(Visit(context.query));
}
return(base.VisitOrder_by_element(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="KoraliumParser.order_by_element"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitOrder_by_element([NotNull] KoraliumParser.Order_by_elementContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="KoraliumParser.order_by_element"/>.
/// <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_element([NotNull] KoraliumParser.Order_by_elementContext context)
{
return(VisitChildren(context));
}
