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/*
* SPDX-FileCopyrightText: 2023 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.store.reasoning.internal;
import tools.refinery.store.query.dnf.Dnf;
import tools.refinery.store.query.dnf.DnfClause;
import tools.refinery.store.query.literal.AbstractCallLiteral;
import tools.refinery.store.query.literal.Literal;
import tools.refinery.store.query.term.Variable;
import tools.refinery.store.reasoning.literal.Concreteness;
import tools.refinery.store.reasoning.literal.ModalConstraint;
import tools.refinery.store.reasoning.literal.Modality;
import tools.refinery.store.reasoning.representation.PartialRelation;
import java.util.*;
class PartialClauseRewriter {
private final PartialQueryRewriter rewriter;
private final List<Literal> completedLiterals = new ArrayList<>();
private final Deque<Literal> workList = new ArrayDeque<>();
private final Set<Variable> positiveVariables = new LinkedHashSet<>();
private final Set<Variable> unmodifiablePositiveVariables = Collections.unmodifiableSet(positiveVariables);
public PartialClauseRewriter(PartialQueryRewriter rewriter) {
this.rewriter = rewriter;
}
public List<Literal> rewriteClause(DnfClause clause) {
workList.addAll(clause.literals());
while (!workList.isEmpty()) {
var literal = workList.removeFirst();
rewrite(literal);
}
return completedLiterals;
}
private void rewrite(Literal literal) {
if (!(literal instanceof AbstractCallLiteral callLiteral)) {
markAsDone(literal);
return;
}
var target = callLiteral.getTarget();
if (target instanceof Dnf dnf) {
rewriteRecursively(callLiteral, dnf);
} else if (target instanceof ModalConstraint modalConstraint) {
var modality = modalConstraint.modality();
var concreteness = modalConstraint.concreteness();
var constraint = modalConstraint.constraint();
if (constraint instanceof Dnf dnf) {
rewriteRecursively(callLiteral, modality, concreteness, dnf);
} else if (constraint instanceof PartialRelation partialRelation) {
rewrite(callLiteral, modality, concreteness, partialRelation);
} else {
throw new IllegalArgumentException("Cannot interpret modal constraint: " + modalConstraint);
}
} else {
markAsDone(literal);
}
}
private void markAsDone(Literal literal) {
completedLiterals.add(literal);
positiveVariables.addAll(literal.getOutputVariables());
}
private void rewriteRecursively(AbstractCallLiteral callLiteral, Modality modality, Concreteness concreteness,
Dnf dnf) {
var liftedDnf = rewriter.getLifter().lift(modality, concreteness, dnf);
rewriteRecursively(callLiteral, liftedDnf);
}
private void rewriteRecursively(AbstractCallLiteral callLiteral, Dnf dnf) {
var rewrittenDnf = rewriter.rewrite(dnf);
var rewrittenLiteral = callLiteral.withTarget(rewrittenDnf);
completedLiterals.add(rewrittenLiteral);
}
private void rewrite(AbstractCallLiteral callLiteral, Modality modality, Concreteness concreteness,
PartialRelation partialRelation) {
var relationRewriter = rewriter.getRelationRewriter(partialRelation);
var literals = relationRewriter.rewriteLiteral(
unmodifiablePositiveVariables, callLiteral, modality, concreteness);
int length = literals.size();
for (int i = length - 1; i >= 0; i--) {
workList.addFirst(literals.get(i));
}
}
}
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