public override Query VisitSgnExpression(CalcParser.SgnExpressionContext context)
{
Query q = Visit(context.expression());
ResultType type = ResultType.Undefined;
if (q.ExpectedResult == ResultType.Number)
{
type = ResultType.Number;
}
return(new Query($"SGN({q})", type));
}
public override Argument VisitSgnExpression(CalcParser.SgnExpressionContext context)
{
Argument arg = Visit(context.expression());
if (arg.IsNull)
{
return(Argument.Null);
}
if (arg.IsDouble)
{
return(new Argument(Math.Sign(arg.ToDouble())));
}
throw ArgumentCastException.Create("double", arg);
}