// Program
public override object VisitProg([NotNull] GrammarParser.ProgContext context)
{
// 1. Visit and resolve left side (must return an AttributeValue)
AttrValAndFeatureSelPair leftSideResult = (AttrValAndFeatureSelPair)Visit(context.lefthandexpr());
AttributeValue leftSideAttributeValueBLO = leftSideResult.AttributeValue;
// 2. Visit and resolve right side (value - single or multiple)
object rightSideValue = Visit(context.righthandexpr());
// 3. Validate and assign resulting value in right side to AttributeValue on the left side
bool isDifferent = (leftSideAttributeValueBLO.Value != rightSideValue.ToString());
if (rightSideValue.GetType() == typeof(int) && leftSideAttributeValueBLO.AttributeDataType == Core.BLOs.AttributeDataTypes.Integer)
{
leftSideAttributeValueBLO.Value = rightSideValue.ToString();
}
else if (rightSideValue.GetType() == typeof(bool))
{
leftSideAttributeValueBLO.Value = rightSideValue.ToString();
}
else
{
throw new Exception("Right side must evaluate to an int or bool");
}
// 4. Return the AttributeValue and it's parent FeatureSelection if any changes were done to it
object returnValue = (isDifferent) ? leftSideResult.ParentFeatureSelection : null;
return(returnValue);
}
/// <summary>
/// Exit a parse tree produced by <see cref="GrammarParser.prog"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitProg([NotNull] GrammarParser.ProgContext context)
{
}
