public override object VisitSelect_expression([NotNull] KoraliumParser.Select_expressionContext context)
{
if (context.STAR() != null)
{
return(new SelectStarExpression());
}
if (context.NULL() != null)
{
return(new SelectNullExpression());
}
var scalarExpressionNode = context.scalar_expression();
var scalarExpression = Visit(scalarExpressionNode) as ScalarExpression;
if (scalarExpression == null)
{
throw new SqlParserException("Could not parse scalar expression");
}
string alias = null;
var aliasNode = context.column_alias();
if (aliasNode != null)
{
alias = aliasNode.GetText();
}
return(new SelectScalarExpression()
{
Alias = alias,
Expression = scalarExpression
});
}
/// <summary>
/// Exit a parse tree produced by <see cref="KoraliumParser.select_expression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitSelect_expression([NotNull] KoraliumParser.Select_expressionContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="KoraliumParser.select_expression"/>.
/// <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 VisitSelect_expression([NotNull] KoraliumParser.Select_expressionContext context)
{
return(VisitChildren(context));
}
