private SqlOrderByEntryNode ParseOrderTerm(ITokenizer t)
{
// ( <QualifiedIdentifier> | <Number> ) ("ASC" | "DESC")?
var identifier = ParseQualifiedIdentifier(t);
if (identifier == null)
{
if (t.Peek().IsType(SqlTokenType.Number))
{
var number = t.GetNext();
identifier = new SqlNumberNode(number);
}
}
if (identifier == null)
{
throw ParsingException.CouldNotParseRule(nameof(ParseOrderTerm), t.Peek());
}
var entry = new SqlOrderByEntryNode
{
Location = identifier.Location,
Source = identifier
};
var next = t.Peek();
if (next.IsKeyword("ASC") || next.IsKeyword("DESC"))
{
t.GetNext();
entry.Direction = next.Value;
}
return(entry);
}
public ISqlNode VisitOrderByEntry(SqlOrderByEntryNode n)
{
Visit(n.Source);
if (!string.IsNullOrEmpty(n.Direction))
{
Append(" ", n.Direction);
}
return(n);
}
public virtual ISqlNode VisitOrderByEntry(SqlOrderByEntryNode n)
{
var source = Visit(n.Source);
return(n.Update(source, n.Direction));
}
public override ISqlNode VisitOrderByEntry(SqlOrderByEntryNode n)
{
return(base.VisitOrderByEntry(n));
}
