/// <summary>
/// Grounds all the cached effects with the currently use operator substitution.
/// </summary>
/// <param name="groundingManager">Grounding manager.</param>
/// <param name="operatorSubstitution">Variables substitution.</param>
public void GroundEffectsByCurrentOperatorSubstitution(GroundingManager groundingManager, ISubstitution operatorSubstitution)
{
OriginalLiftedPredicates.Clear();
OriginalLiftedFunctions.Clear();
GroundedPositivePredicateEffects.Clear();
foreach (var predicate in PositivePredicateEffects)
{
var groundedPredicate = operatorSubstitution.IsEmpty() ? predicate : groundingManager.GroundAtom(predicate, operatorSubstitution);
GroundedPositivePredicateEffects.Add(groundedPredicate);
if (!OriginalLiftedPredicates.ContainsKey(groundedPredicate))
{
OriginalLiftedPredicates.Add(groundedPredicate, predicate);
}
}
GroundedNegativePredicateEffects.Clear();
foreach (var predicate in NegativePredicateEffects)
{
var groundedPredicate = operatorSubstitution.IsEmpty() ? predicate : groundingManager.GroundAtom(predicate, operatorSubstitution);
GroundedNegativePredicateEffects.Add(groundedPredicate);
if (!OriginalLiftedPredicates.ContainsKey(groundedPredicate))
{
OriginalLiftedPredicates.Add(groundedPredicate, predicate);
}
}
GroundedNumericFunctionAssignmentEffects.Clear();
foreach (var numericFunc in NumericFunctionAssignmentEffects)
{
var groundedFunction = operatorSubstitution.IsEmpty() ? numericFunc.FunctionAtom : groundingManager.GroundAtom(numericFunc.FunctionAtom, operatorSubstitution);
var groundedAssignment = operatorSubstitution.IsEmpty() ? numericFunc.GetBackwardsSubstitutedValue() : groundingManager.GroundNumericExpression(numericFunc.GetBackwardsSubstitutedValue(), operatorSubstitution);
GroundedNumericFunctionAssignmentEffects.Add(groundedFunction, groundedAssignment);
if (!OriginalLiftedFunctions.ContainsKey(groundedFunction))
{
OriginalLiftedFunctions.Add(groundedFunction, numericFunc.FunctionAtom);
}
}
GroundedObjectFunctionAssignmentEffects.Clear();
foreach (var objectFunc in ObjectFunctionAssignmentEffects)
{
var groundedFunction = operatorSubstitution.IsEmpty() ? objectFunc.FunctionAtom : groundingManager.GroundAtom(objectFunc.FunctionAtom, operatorSubstitution);
var groundedAssignment = operatorSubstitution.IsEmpty() ? objectFunc.Value : groundingManager.GroundTerm(objectFunc.Value, operatorSubstitution);
GroundedObjectFunctionAssignmentEffects.Add(groundedFunction, groundedAssignment);
if (!OriginalLiftedFunctions.ContainsKey(groundedFunction))
{
OriginalLiftedFunctions.Add(groundedFunction, objectFunc.FunctionAtom);
}
}
}
/// <summary>
/// Visits the expression.
/// </summary>
/// <param name="expression">Expression.</param>
public Tuple <bool, bool> Visit(EqualsLiteralCNF expression)
{
bool positiveCondition = false;
bool negativeCondition = true;
Action <ITerm, ITerm> checkObjectFunctionArgument = (argument, secondaryArgument) =>
{
ObjectFunctionTerm objectFunction = argument as ObjectFunctionTerm;
if (objectFunction != null)
{
ITerm assignValue;
if (Effects.GroundedObjectFunctionAssignmentEffects.TryGetValue(GroundingManager.GroundAtom(objectFunction.FunctionAtom, ExpressionSubstitution), out assignValue))
{
positiveCondition = true;
if (!(secondaryArgument is ObjectFunctionTerm) && !(assignValue is ObjectFunctionTerm))
{
bool valueDiffersValueAssign = !GroundingManager.GroundTerm(secondaryArgument, ExpressionSubstitution).Equals(GroundingManager.GroundTerm(assignValue, OperatorSubstitution));
if (valueDiffersValueAssign && !expression.IsNegated || !valueDiffersValueAssign && expression.IsNegated)
{
// surely assigning different value (or assigning exact value with negated equals) -> not relevant
negativeCondition = false;
}
}
}
}
};
checkObjectFunctionArgument(expression.LeftArgument, expression.RightArgument);
checkObjectFunctionArgument(expression.RightArgument, expression.LeftArgument);
return(Tuple.Create(positiveCondition, negativeCondition));
}
/// <summary>
/// Visits and handles the effect.
/// </summary>
/// <param name="effect">Effect.</param>
public void Visit(PredicateEffect effect)
{
if (!IsNegated)
{
ResultAtoms.Add(GroundingManager.GroundAtom(effect.PredicateAtom, Substitution));
}
}
/// <summary>
/// Visits the expression.
/// </summary>
/// <param name="expression">Expression.</param>
public Tuple <bool, bool> Visit(PredicateLiteralCNF expression)
{
bool hasPositive = Effects.GroundedPositivePredicateEffects.Contains(GroundingManager.GroundAtom(expression.PredicateAtom, ExpressionSubstitution));
bool hasNegative = Effects.GroundedNegativePredicateEffects.Contains(GroundingManager.GroundAtom(expression.PredicateAtom, ExpressionSubstitution));
bool positiveCondition = (expression.IsNegated) ? hasNegative : hasPositive;
bool negativeCondition = !((expression.IsNegated) ? hasPositive : hasNegative);
return(Tuple.Create(positiveCondition, negativeCondition));
}
/// <summary>
/// Visits and evaluates predicate expression.
/// </summary>
/// <param name="expression">Predicate expression.</param>
/// <returns>True if the specified expression evaluates as true, false otherwise.</returns>
public bool Visit(PredicateExpression expression)
{
// if the predicate is a rigid relation, then check whether it has the correct value
if (RigidRelations.IsPredicateRigidRelation(expression.PredicateAtom))
{
IAtom predicateAtom = GroundingManager.GroundAtom(expression.PredicateAtom, Substitution);
return(RigidRelations.Contains(predicateAtom));
}
return(true);
}
/// <summary>
/// Visits and performs a property count on predicate expression.
/// </summary>
/// <param name="expression">Predicate expression.</param>
/// <returns>Tuple (property satisfied count, property not satisfied count).</returns>
public Tuple <double, double> Visit(PredicateLiteralCNF expression)
{
var groundedAtom = GroundingManager.GroundAtom(expression.PredicateAtom, Substitution);
double value;
if (StateLabels.TryGetValue(groundedAtom, out value))
{
return((expression.IsNegated) ? Tuple.Create(0.0, value) : Tuple.Create(value, 0.0));
}
return(Tuple.Create(0.0, 0.0));
}
/// <summary>
/// Transforms the numeric expression.
/// </summary>
/// <param name="expression">Numeric expression.</param>
/// <returns>Transformed numeric expression.</returns>
public INumericExpression Visit(NumericFunction expression)
{
IAtom functionAtom = GroundingManager.GroundAtom(expression.FunctionAtom, ExpressionSubstitution);
if (!ReplacedFunctionAtomsInSubExpression.Contains(functionAtom))
{
INumericExpression substitutedValue;
if (NumericFunctionAssignments.TryGetValue(functionAtom, out substitutedValue))
{
ReplacedFunctionAtomsInSubExpression.Add(functionAtom);
ExpressionSubstitution.AddLocalSubstitution(OperatorSubstitution);
INumericExpression transformedValue = substitutedValue.Accept(this);
ExpressionSubstitution.RemoveLocalSubstitution(OperatorSubstitution);
ReplacedFunctionAtomsInSubExpression.Remove(functionAtom);
return(transformedValue);
}
}
return(expression.Clone());
}
/// <summary>
/// Visits the expression.
/// </summary>
/// <param name="expression">Expression.</param>
public Tuple <bool, bool> Visit(NumericCompareLiteralCNF expression)
{
HashSet <NumericFunction> numericFunctions = new HashSet <NumericFunction>();
NumericFunctionsCollector collector = new NumericFunctionsCollector();
numericFunctions.UnionWith(collector.Collect(expression.LeftArgument));
numericFunctions.UnionWith(collector.Collect(expression.RightArgument));
bool positiveCondition = false;
foreach (var numericFunction in numericFunctions)
{
positiveCondition |= Effects.GroundedNumericFunctionAssignmentEffects.ContainsKey(GroundingManager.GroundAtom(numericFunction.FunctionAtom, ExpressionSubstitution));
}
return(Tuple.Create(positiveCondition, true));
}
/// <summary>
/// Grounds the specified atom.
/// </summary>
/// <param name="atom">Atom.</param>
/// <returns>Grounded atom.</returns>
private IAtom GroundAtom(IAtom atom)
{
return(GroundingManager.GroundAtom(atom, ExpressionSubstitution));
}
