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package org.eclipse.viatra.solver.language.resource;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.eclipse.viatra.solver.language.model.problem.Argument;
import org.eclipse.viatra.solver.language.model.problem.Atom;
import org.eclipse.viatra.solver.language.model.problem.Conjunction;
import org.eclipse.viatra.solver.language.model.problem.ExistentialQuantifier;
import org.eclipse.viatra.solver.language.model.problem.ImplicitVariable;
import org.eclipse.viatra.solver.language.model.problem.Literal;
import org.eclipse.viatra.solver.language.model.problem.NegativeLiteral;
import org.eclipse.viatra.solver.language.model.problem.Parameter;
import org.eclipse.viatra.solver.language.model.problem.PredicateDefinition;
import org.eclipse.viatra.solver.language.model.problem.Problem;
import org.eclipse.viatra.solver.language.model.problem.ProblemFactory;
import org.eclipse.viatra.solver.language.model.problem.ProblemPackage;
import org.eclipse.viatra.solver.language.model.problem.Statement;
import org.eclipse.viatra.solver.language.model.problem.VariableOrNodeArgument;
import org.eclipse.viatra.solver.language.naming.NamingUtil;
import org.eclipse.xtext.linking.impl.LinkingHelper;
import org.eclipse.xtext.naming.IQualifiedNameConverter;
import org.eclipse.xtext.nodemodel.INode;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.scoping.IScope;
import org.eclipse.xtext.scoping.IScopeProvider;
import org.eclipse.xtext.scoping.impl.AbstractDeclarativeScopeProvider;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;
@Singleton
public class DerivedVariableComputer {
@Inject
private LinkingHelper linkingHelper;
@Inject
private IQualifiedNameConverter qualifiedNameConverter;
@Inject
@Named(AbstractDeclarativeScopeProvider.NAMED_DELEGATE)
private IScopeProvider scopeProvider;
public void installDerivedVariables(Problem problem, Set<String> nodeNames) {
for (Statement statement : problem.getStatements()) {
if (statement instanceof PredicateDefinition definition) {
installDerivedPredicateDefinitionState(definition, nodeNames);
}
}
}
protected void installDerivedPredicateDefinitionState(PredicateDefinition definition, Set<String> nodeNames) {
Set<String> knownVariables = new HashSet<>();
knownVariables.addAll(nodeNames);
for (Parameter parameter : definition.getParameters()) {
String name = parameter.getName();
if (name != null) {
knownVariables.add(name);
}
}
for (Conjunction body : definition.getBodies()) {
installDeriveConjunctionState(body, knownVariables);
}
}
protected void installDeriveConjunctionState(Conjunction conjunction, Set<String> knownVariables) {
Set<String> newVariables = new HashSet<>();
for (Literal literal : conjunction.getLiterals()) {
if (literal instanceof Atom atom) {
createSigletonVariablesAndCollectVariables(atom, knownVariables, newVariables);
}
}
createVariables(conjunction, newVariables);
newVariables.addAll(knownVariables);
for (Literal literal : conjunction.getLiterals()) {
if (literal instanceof NegativeLiteral negativeLiteral) {
installDeriveNegativeLiteralState(negativeLiteral, newVariables);
}
}
}
protected void installDeriveNegativeLiteralState(NegativeLiteral negativeLiteral, Set<String> knownVariables) {
Set<String> newVariables = new HashSet<>();
createSigletonVariablesAndCollectVariables(negativeLiteral.getAtom(), knownVariables, newVariables);
createVariables(negativeLiteral, newVariables);
}
protected void createSigletonVariablesAndCollectVariables(Atom atom, Set<String> knownVariables,
Set<String> newVariables) {
for (Argument argument : atom.getArguments()) {
if (argument instanceof VariableOrNodeArgument variableOrNodeArgument) {
IScope scope = scopeProvider.getScope(variableOrNodeArgument,
ProblemPackage.Literals.VARIABLE_OR_NODE_ARGUMENT__VARIABLE_OR_NODE);
List<INode> nodes = NodeModelUtils.findNodesForFeature(variableOrNodeArgument,
ProblemPackage.Literals.VARIABLE_OR_NODE_ARGUMENT__VARIABLE_OR_NODE);
for (INode node : nodes) {
var variableName = linkingHelper.getCrossRefNodeAsString(node, true);
var created = tryCreateVariableForArgument(variableOrNodeArgument, variableName, scope,
knownVariables, newVariables);
if (created) {
break;
}
}
}
}
}
protected boolean tryCreateVariableForArgument(VariableOrNodeArgument variableOrNodeArgument, String variableName,
IScope scope, Set<String> knownVariables, Set<String> newVariables) {
if (!NamingUtil.isValidId(variableName)) {
return false;
}
var qualifiedName = qualifiedNameConverter.toQualifiedName(variableName);
if (scope.getSingleElement(qualifiedName) != null) {
return false;
}
if (NamingUtil.isSingletonVariableName(variableName)) {
createSingletonVariable(variableOrNodeArgument, variableName);
return true;
}
if (!knownVariables.contains(variableName)) {
newVariables.add(variableName);
return true;
}
return false;
}
protected void createVariables(ExistentialQuantifier quantifier, Set<String> newVariables) {
for (String variableName : newVariables) {
createVariable(quantifier, variableName);
}
}
protected void createVariable(ExistentialQuantifier quantifier, String variableName) {
if (NamingUtil.isValidId(variableName)) {
ImplicitVariable variable = createNamedVariable(variableName);
quantifier.getImplicitVariables().add(variable);
}
}
protected void createSingletonVariable(VariableOrNodeArgument argument, String variableName) {
if (NamingUtil.isValidId(variableName)) {
ImplicitVariable variable = createNamedVariable(variableName);
argument.setSingletonVariable(variable);
}
}
protected ImplicitVariable createNamedVariable(String variableName) {
var variable = ProblemFactory.eINSTANCE.createImplicitVariable();
variable.setName(variableName);
return variable;
}
public void discardDerivedVariables(Problem problem) {
for (Statement statement : problem.getStatements()) {
if (statement instanceof PredicateDefinition predicateDefinition) {
discardPredicateDefinitionState(predicateDefinition);
}
}
}
protected void discardPredicateDefinitionState(PredicateDefinition definition) {
for (Conjunction body : definition.getBodies()) {
body.getImplicitVariables().clear();
for (Literal literal : body.getLiterals()) {
if (literal instanceof Atom atom) {
discardDerivedAtomState(atom);
}
if (literal instanceof NegativeLiteral negativeLiteral) {
negativeLiteral.getImplicitVariables().clear();
discardDerivedAtomState(negativeLiteral.getAtom());
}
}
}
}
protected void discardDerivedAtomState(Atom atom) {
if (atom == null) {
return;
}
for (Argument argument : atom.getArguments()) {
if (argument instanceof VariableOrNodeArgument variableOrNodeArgument) {
variableOrNodeArgument.setSingletonVariable(null);
}
}
}
}
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