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package org.eclipse.viatra.solver.language.resource;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.viatra.solver.language.ProblemUtil;
import org.eclipse.viatra.solver.language.model.problem.Argument;
import org.eclipse.viatra.solver.language.model.problem.Assertion;
import org.eclipse.viatra.solver.language.model.problem.Atom;
import org.eclipse.viatra.solver.language.model.problem.ClassDeclaration;
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.Node;
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.xtext.linking.impl.LinkingHelper;
import org.eclipse.xtext.naming.IQualifiedNameConverter;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.nodemodel.INode;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.resource.DerivedStateAwareResource;
import org.eclipse.xtext.resource.IDerivedStateComputer;
import org.eclipse.xtext.scoping.IGlobalScopeProvider;
import org.eclipse.xtext.scoping.IScope;
import com.google.common.base.Predicates;
import com.google.inject.Inject;
import com.google.inject.Singleton;
@Singleton
public class ProblemDerivedStateComputer implements IDerivedStateComputer {
public static final String NEW_NODE = "new";
private static final Pattern ID_REGEX = Pattern.compile("[_a-zA-Z][_0-9a-zA-Z]*|'(\\\\.|[^\\'])*'");
@Inject
private LinkingHelper linkingHelper;
@Inject
private IQualifiedNameConverter qualifiedNameConverter;
@Inject
private IGlobalScopeProvider scopeProvider;
@Override
public void installDerivedState(DerivedStateAwareResource resource, boolean preLinkingPhase) {
for (EObject object : resource.getContents()) {
if (object instanceof Problem) {
installDerivedProblemState((Problem) object, preLinkingPhase);
}
}
}
protected void installDerivedProblemState(Problem problem, boolean preLinkingPhase) {
installNewNodes(problem);
if (!preLinkingPhase) {
installDerivedNodes(problem);
}
for (Statement statement : problem.getStatements()) {
if (statement instanceof PredicateDefinition) {
PredicateDefinition definition = (PredicateDefinition) statement;
installDerivedPredicateDefinitionState(definition);
}
}
}
protected void installNewNodes(Problem problem) {
for (Statement statement : problem.getStatements()) {
if (statement instanceof ClassDeclaration) {
ClassDeclaration declaration = (ClassDeclaration) statement;
if (!declaration.isAbstract()) {
Node newNode = createNode(NEW_NODE);
declaration.setNewNode(newNode);
}
}
}
}
protected void installDerivedNodes(Problem problem) {
IScope nodeScope = scopeProvider.getScope(problem.eResource(), ProblemPackage.Literals.ASSERTION__ARGUMENTS,
Predicates.alwaysTrue());
Set<String> nodeNames = new HashSet<>();
for (Statement statement : problem.getStatements()) {
if (statement instanceof Assertion) {
Assertion assertion = (Assertion) statement;
List<INode> nodes = NodeModelUtils.findNodesForFeature(assertion,
ProblemPackage.Literals.ASSERTION__ARGUMENTS);
for (INode node : nodes) {
String nodeName = linkingHelper.getCrossRefNodeAsString(node, true);
if (validId(nodeName)) {
QualifiedName qualifiedName = qualifiedNameConverter.toQualifiedName(nodeName);
if (!nodeNames.contains(nodeName) && nodeScope.getSingleElement(qualifiedName) == null) {
nodeNames.add(nodeName);
}
}
}
}
}
List<Node> grapNodes = problem.getNodes();
for (String nodeName : nodeNames) {
Node graphNode = createNode(nodeName);
grapNodes.add(graphNode);
}
}
protected Node createNode(String name) {
Node node = ProblemFactory.eINSTANCE.createNode();
node.setName(name);
return node;
}
protected void installDerivedPredicateDefinitionState(PredicateDefinition definition) {
Set<String> parameterNames = new HashSet<>();
for (Parameter parameter : definition.getParameters()) {
String name = parameter.getName();
if (name != null) {
parameterNames.add(name);
}
}
for (Conjunction body : definition.getBodies()) {
installDeriveConjunctionState(body, parameterNames);
}
}
protected void installDeriveConjunctionState(Conjunction conjunction, Set<String> knownVariables) {
Set<String> newVariables = new HashSet<>();
for (Literal literal : conjunction.getLiterals()) {
if (literal instanceof Atom) {
Atom atom = (Atom) literal;
createSigletonVariablesAndCollectVariables(atom, knownVariables, newVariables);
}
}
createVariables(conjunction, newVariables);
newVariables.addAll(knownVariables);
for (Literal literal : conjunction.getLiterals()) {
if (literal instanceof NegativeLiteral) {
NegativeLiteral negativeLiteral = (NegativeLiteral) literal;
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) {
List<INode> nodes = NodeModelUtils.findNodesForFeature(atom, ProblemPackage.Literals.ATOM__ARGUMENTS);
int nodesSize = nodes.size();
List<Argument> arguments = atom.getArguments();
int argumentsSize = arguments.size();
for (int i = 0; i < nodesSize; i++) {
INode node = nodes.get(i);
String variableName = linkingHelper.getCrossRefNodeAsString(node, true);
if (ProblemUtil.isSingletonVariableName(variableName)) {
if (i < argumentsSize) {
createSingletonVariable(arguments.get(i), variableName);
}
continue;
}
if (!knownVariables.contains(variableName)) {
newVariables.add(variableName);
}
}
}
protected void createVariables(ExistentialQuantifier quantifier, Set<String> newVariables) {
for (String variableName : newVariables) {
createVariable(quantifier, variableName);
}
}
protected void createVariable(ExistentialQuantifier quantifier, String variableName) {
if (validId(variableName)) {
ImplicitVariable variable = createNamedVariable(variableName);
quantifier.getImplicitVariables().add(variable);
}
}
protected void createSingletonVariable(Argument argument, String variableName) {
if (validId(variableName)) {
ImplicitVariable variable = createNamedVariable(variableName);
argument.setSingletonVariable(variable);
}
}
protected ImplicitVariable createNamedVariable(String variableName) {
ImplicitVariable variable = ProblemFactory.eINSTANCE.createImplicitVariable();
variable.setName(variableName);
return variable;
}
@Override
public void discardDerivedState(DerivedStateAwareResource resource) {
for (EObject object : resource.getContents()) {
if (object instanceof Problem) {
discardDerivedProblemState((Problem) object);
}
}
}
protected void discardDerivedProblemState(Problem problem) {
problem.getNodes().clear();
for (Statement statement : problem.getStatements()) {
if (statement instanceof ClassDeclaration) {
ClassDeclaration classDeclaration = (ClassDeclaration) statement;
classDeclaration.setNewNode(null);
} else if (statement instanceof PredicateDefinition) {
PredicateDefinition definition = (PredicateDefinition) statement;
for (Conjunction body : definition.getBodies()) {
body.getImplicitVariables().clear();
for (Literal literal : body.getLiterals()) {
if (literal instanceof NegativeLiteral) {
NegativeLiteral negativeLiteral = (NegativeLiteral) literal;
negativeLiteral.getImplicitVariables().clear();
}
}
}
}
}
}
protected static boolean validId(String name) {
return name != null && ID_REGEX.matcher(name).matches();
}
}
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