public override Argument VisitAdditiveExpression(CalcParser.AdditiveExpressionContext context)
{
Argument arg1 = Visit(context.expression(0));
Argument arg2 = Visit(context.expression(1));
if (arg1.IsNull || arg2.IsNull)
{
return(Argument.Null);
}
if (context.Plus() != null)
{
return(Sum(arg1, arg2));
}
if (context.Minus() != null)
{
return(Difference(arg1, arg2));
}
return(Argument.Null);
}
public override Query VisitAdditiveExpression(CalcParser.AdditiveExpressionContext context)
{
Query q1 = Visit(context.expression(0));
Query q2 = Visit(context.expression(1));
if (context.Plus() != null)
{
ResultType type = ResultType.Undefined;
if (q1.ExpectedResult == ResultType.Number)
{
if (q2.ExpectedResult == ResultType.Number)
{
type = ResultType.Number;
}
else if (q2.ExpectedResult == ResultType.Date)
{
type = ResultType.Date;
}
}
if (q1.ExpectedResult == ResultType.Date)
{
if (q2.ExpectedResult == ResultType.Number)
{
type = ResultType.Date;
}
}
return(new Query($"({q1}+{q2})", type));
}
if (context.Minus() != null)
{
ResultType type = ResultType.Undefined;
if (q1.ExpectedResult == ResultType.Number && q2.ExpectedResult == ResultType.Number)
{
type = ResultType.Number;
}
if (q1.ExpectedResult == ResultType.Date)
{
if (q2.ExpectedResult == ResultType.Date)
{
type = ResultType.Number;
}
else if (q2.ExpectedResult == ResultType.Number)
{
type = ResultType.Date;
}
}
string queryText = $"({q1}-{q2})";
if (q1.ExpectedResult == ResultType.Date && q2.ExpectedResult == ResultType.Date)
{
queryText = this._dbTranslator.CastToInt(queryText);
}
return(new Query(queryText, type));
}
throw new ExpressionException("Unknown additive operation: " + context.GetText());
}
