/// <summary>
/// Processes forall effects.
/// </summary>
/// <param name="expression">Conditions expression in CNF.</param>
/// <returns>Tuple of two values, where the first is true when the positive relevance condition (inclusion) is satisfied, while the second is
/// true when the negative condition (exclusion) is not violated. False otherwise.</returns>
private Tuple <bool, bool> ProcessForallEffects(ConditionsCNF expression)
{
bool positiveCondition = false;
bool negativeCondition = true;
foreach (var forallEffect in Effects.ForallEffects)
{
EffectsRelevanceConditionsEvaluator evaluator = new EffectsRelevanceConditionsEvaluator(forallEffect.Effects, GroundingManager);
IEnumerable <ISubstitution> localSubstitutions = GroundingManager.GenerateAllLocalSubstitutions(forallEffect.Parameters);
foreach (var localSubstitution in localSubstitutions)
{
OperatorSubstitution.AddLocalSubstitution(localSubstitution);
var result = evaluator.EvaluateWithExtendedResult(expression, OperatorSubstitution, null);
positiveCondition |= result.Item1;
negativeCondition &= result.Item2;
OperatorSubstitution.RemoveLocalSubstitution(localSubstitution);
if (!negativeCondition)
{
return(result);
}
}
}
return(Tuple.Create(positiveCondition, true));
}
/// <summary>
/// Processes forall effects.
/// </summary>
/// <param name="expression">Conditions expression in CNF.</param>
private ConditionsCNF ProcessForallEffects(ConditionsCNF expression)
{
if (Effects.ForallEffects.Count == 0)
{
return(expression);
}
foreach (var forallEffect in Effects.ForallEffects)
{
EffectsBackwardsConditionsApplier innerApplier = new EffectsBackwardsConditionsApplier(null, forallEffect.Effects, EvaluationManager);
IEnumerable <ISubstitution> localSubstitutions = GroundingManager.GenerateAllLocalSubstitutions(forallEffect.Parameters);
foreach (var localSubstitution in localSubstitutions)
{
OperatorSubstitution.AddLocalSubstitution(localSubstitution);
expression = (ConditionsCNF)innerApplier.ApplyBackwards(expression, OperatorSubstitution);
OperatorSubstitution.RemoveLocalSubstitution(localSubstitution);
}
}
return(expression);
}
