Examples with BindingResult at.ac.tuwien.kr.alpha.core.grounder.instantiation.BindingResult used on opensource projects

Example 6 with BindingResult

use of at.ac.tuwien.kr.alpha.core.grounder.instantiation.BindingResult in project Alpha by alpha-asp.

the class NaiveGrounderTest method testDeadEnd.

/**
 * Tests the method {@link NaiveGrounder#getGroundInstantiations(InternalRule, RuleGroundingOrder, Substitution, Assignment)} on a
 * predefined program:
 * <code>
 *  p1(1). q1(1). <br/>
 * 	x :- p1(X), p2(X), q1(Y), q2(Y). <br/>
 * 	p2(X) :- something(X). <br/>
 * 	q2(X) :- something(X). <br/>
 * </code>
 * Given one grounding order {@code groundingOrder} for the first rule in this program which starts with
 * the literal whose predicate name is {@code predicateNameOfStartingLiteral} and a substitution substituting
 * the variable in this literal by 1 it is attempted to ground the rule.
 * It is then asserted that ground instantiations are produced if and only if {@code expectNoGoods} is true.
 *
 * @param predicateNameOfStartingLiteral the predicate name of the starting literal, either "p1" or "q1".
 * @param groundingOrder                 a grounding order for the first rule in the predefined program that starts with the literal
 *                                       whose predicate name is {@code predicateNameOfStartingLiteral}.
 * @param expectNoGoods                  {@code true} iff ground instantiations are expected to be produced under the conditions
 *                                       described above.
 */
private void testDeadEnd(String predicateNameOfStartingLiteral, RuleGroundingOrderImpl groundingOrder, boolean expectNoGoods) {
    String aspStr = "p1(1). q1(1). " + "x :- p1(X), p2(X), q1(Y), q2(Y). " + "p2(X) :- something(X). " + "q2(X) :- something(X). ";
    CompiledProgram program = InternalProgram.fromNormalProgram(NORMALIZE_TRANSFORM.apply(PROGRAM_PARSER.parse(aspStr)));
    AtomStore atomStore = new AtomStoreImpl();
    NaiveGrounder grounder = (NaiveGrounder) GrounderFactory.getInstance("naive", program, atomStore, p -> true, GrounderHeuristicsConfiguration.permissive(), true);
    CompiledRule nonGroundRule = grounder.getNonGroundRule(0);
    String strLiteral = "p1".equals(predicateNameOfStartingLiteral) ? "p1(X)" : "p1(Y)";
    final Literal startingLiteral = PROGRAM_PART_PARSER.parseLiteral(strLiteral);
    ((RuleGroundingInfoImpl) nonGroundRule.getGroundingInfo()).groundingOrders.put(startingLiteral, groundingOrder);
    grounder.bootstrap();
    TrailAssignment currentAssignment = new TrailAssignment(atomStore);
    final Substitution subst1 = BasicSubstitution.specializeSubstitution(startingLiteral, new Instance(Terms.newConstant(1)), BasicSubstitution.EMPTY_SUBSTITUTION);
    final BindingResult bindingResult = grounder.getGroundInstantiations(nonGroundRule, groundingOrder, subst1, currentAssignment);
    assertEquals(expectNoGoods, bindingResult.size() > 0);
}

Example 7 with BindingResult

use of at.ac.tuwien.kr.alpha.core.grounder.instantiation.BindingResult in project Alpha by alpha-asp.

the class NaiveGrounderTest method testIfGrounderGroundsRule.

/**
 * Tests if {@link NaiveGrounder#getGroundInstantiations(InternalRule, RuleGroundingOrder, Substitution, Assignment)}
 * produces ground instantiations for the rule with ID {@code ruleID} in {@code program} when {@code startingLiteral}
 * unified with the numeric instance {@code startingInstance} is used as starting literal and {@code b(1)} is assigned
 * {@code bTruth}.
 * It is asserted that ground instantiations are produced if and only if {@code expectNoGoods} is true.
 */
private void testIfGrounderGroundsRule(ASPCore2Program program, int ruleID, Literal startingLiteral, int startingInstance, ThriceTruth bTruth, boolean expectNoGoods) {
    CompiledProgram internalPrg = InternalProgram.fromNormalProgram(NORMALIZE_TRANSFORM.apply(program));
    AtomStore atomStore = new AtomStoreImpl();
    TrailAssignment currentAssignment = new TrailAssignment(atomStore);
    NaiveGrounder grounder = (NaiveGrounder) GrounderFactory.getInstance("naive", internalPrg, atomStore, p -> true, GrounderHeuristicsConfiguration.permissive(), true);
    int b = atomStore.putIfAbsent(atom("b", 1));
    currentAssignment.growForMaxAtomId();
    currentAssignment.assign(b, bTruth);
    grounder.bootstrap();
    final CompiledRule nonGroundRule = grounder.getNonGroundRule(ruleID);
    final Substitution substStartingLiteral = BasicSubstitution.specializeSubstitution(startingLiteral, new Instance(Terms.newConstant(startingInstance)), BasicSubstitution.EMPTY_SUBSTITUTION);
    final BindingResult bindingResult = grounder.getGroundInstantiations(nonGroundRule, nonGroundRule.getGroundingInfo().orderStartingFrom(startingLiteral), substStartingLiteral, currentAssignment);
    assertEquals(expectNoGoods, bindingResult.size() > 0);
}