/// <summary>
/// Visits and performs a property count on forall expression.
/// </summary>
/// <param name="expression">Forall expression.</param>
/// <returns>Tuple (property satisfied count, property not satisfied count).</returns>
public Tuple <double, double> Visit(ForallExpression expression)
{
double positiveValue = 0;
double negativeValue = 0;
IEnumerable <ISubstitution> localSubstitutions = GroundingManager.GenerateAllLocalSubstitutions(expression.Parameters);
foreach (var localSubstitution in localSubstitutions)
{
Substitution.AddLocalSubstitution(localSubstitution);
var childPropertyCounts = expression.Child.Accept(this);
Substitution.RemoveLocalSubstitution(localSubstitution);
if (EvaluationStrategy == ForwardCostEvaluationStrategy.ADDITIVE_VALUE)
{
positiveValue += childPropertyCounts.Item1;
negativeValue += childPropertyCounts.Item2;
}
else
{
positiveValue = Math.Max(positiveValue, childPropertyCounts.Item1);
negativeValue = Math.Max(negativeValue, childPropertyCounts.Item2);
}
}
return(Tuple.Create(positiveValue, negativeValue));
}
/// <summary>
/// Checks the equality of objects.
/// </summary>
/// <param name="obj">Object to be checked.</param>
/// <returns>True if the objects are equal, false otherwise.</returns>
public override bool Equals(object obj)
{
ForallExpression other = obj as ForallExpression;
if (other == null)
{
return(false);
}
return(Parameters.Equals(other.Parameters) && Child.Equals(other.Child));
}
/// <summary>
/// Visits and transforms the expression.
/// </summary>
/// <param name="expression">Source expression.</param>
/// <returns>Transformed expression.</returns>
public override IExpression Visit(ForallExpression expression)
{
List <IExpression> arguments = TransformQuantifiedSubExpression(expression.Parameters, expression.Child);
if (IsNegating)
{
return(new OrExpression(arguments));
}
return(new AndExpression(arguments));
}
/// <summary>
/// Visits the expression.
/// </summary>
/// <param name="expression">Expression.</param>
public void Visit(ForallExpression expression)
{
expression.Child.Accept(this);
foreach (var parameter in expression.Parameters)
{
if (CollectedParameters.Contains(parameter.ParameterNameId))
{
CollectedParameters.Remove(parameter.ParameterNameId);
}
}
}
/// <summary>
/// Visits and evaluates forall expression.
/// </summary>
/// <param name="expression">Forall expression.</param>
/// <returns>True if the specified expression evaluates as true, false otherwise.</returns>
public bool Visit(ForallExpression expression)
{
IEnumerable <ISubstitution> localSubstitutions = GroundingManager.GenerateAllLocalSubstitutions(expression.Parameters);
foreach (var localSubstitution in localSubstitutions)
{
Substitution.AddLocalSubstitution(localSubstitution);
bool subExpressionResult = expression.Child.Accept(this);
Substitution.RemoveLocalSubstitution(localSubstitution);
if (!subExpressionResult)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Visits and performs a property count on forall expression.
/// </summary>
/// <param name="expression">Forall expression.</param>
/// <returns>Tuple (property satisfied count, property not satisfied count).</returns>
public Tuple <int, int> Visit(ForallExpression expression)
{
int fulfilled = 0;
int notFulfilled = 0;
IEnumerable <ISubstitution> localSubstitutions = GroundingManager.GenerateAllLocalSubstitutions(expression.Parameters);
foreach (var localSubstitution in localSubstitutions)
{
Substitution.AddLocalSubstitution(localSubstitution);
var childPropertyCounts = expression.Child.Accept(this);
Substitution.RemoveLocalSubstitution(localSubstitution);
fulfilled += childPropertyCounts.Item1;
notFulfilled += childPropertyCounts.Item2;
}
return(Tuple.Create(fulfilled, notFulfilled));
}
/// <summary>
/// Visits and transforms the expression.
/// </summary>
/// <param name="expression">Source expression.</param>
/// <returns>Transformed expression.</returns>
public override IExpression Visit(ForallExpression expression)
{
return(new ForallExpression(expression.Parameters, expression.Child.Accept(this)));
}
