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/*
* SPDX-FileCopyrightText: 2021-2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.ide.contentassist;
import com.google.inject.Inject;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.CrossReference;
import org.eclipse.xtext.EcoreUtil2;
import org.eclipse.xtext.GrammarUtil;
import org.eclipse.xtext.ide.editor.contentassist.ContentAssistContext;
import org.eclipse.xtext.ide.editor.contentassist.IdeCrossrefProposalProvider;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.scoping.IScope;
import org.eclipse.xtext.xtext.CurrentTypeFinder;
import org.jetbrains.annotations.Nullable;
import tools.refinery.language.model.problem.*;
import tools.refinery.language.naming.NamingUtil;
import tools.refinery.language.naming.ProblemQualifiedNameConverter;
import tools.refinery.language.resource.ProblemResourceDescriptionStrategy;
import tools.refinery.language.scoping.imports.ImportCollector;
import tools.refinery.language.utils.BuiltinSymbols;
import tools.refinery.language.utils.ProblemDesugarer;
import tools.refinery.language.utils.ProblemUtil;
import tools.refinery.language.validation.ReferenceCounter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Objects;
public class ProblemCrossrefProposalProvider extends IdeCrossrefProposalProvider {
@Inject
private CurrentTypeFinder currentTypeFinder;
@Inject
private ReferenceCounter referenceCounter;
@Inject
private ProblemDesugarer desugarer;
@Inject
private ImportCollector importCollector;
@Override
protected Iterable<IEObjectDescription> queryScope(IScope scope, CrossReference crossReference,
ContentAssistContext context) {
var eObjectDescriptionsByName = new HashMap<ProblemResourceDescriptionStrategy.ShadowingKey,
List<IEObjectDescription>>();
for (var candidate : super.queryScope(scope, crossReference, context)) {
if (isExistingObject(candidate, crossReference, context)) {
var shadowingKey = ProblemResourceDescriptionStrategy.getShadowingKey(candidate);
var candidateList = eObjectDescriptionsByName.computeIfAbsent(shadowingKey,
ignored -> new ArrayList<>());
candidateList.add(candidate);
}
}
var eObjectDescriptions = new ArrayList<IEObjectDescription>();
for (var candidates : eObjectDescriptionsByName.values()) {
if (candidates.size() == 1) {
var candidate = candidates.getFirst();
if (shouldBeVisible(candidate, crossReference, context)) {
eObjectDescriptions.add(candidate);
}
}
}
return eObjectDescriptions;
}
protected boolean isExistingObject(IEObjectDescription candidate, CrossReference crossRef,
ContentAssistContext context) {
var rootModel = context.getRootModel();
var eObjectOrProxy = candidate.getEObjectOrProxy();
if (!Objects.equals(rootModel.eResource(), eObjectOrProxy.eResource())) {
return true;
}
var currentValue = getCurrentValue(crossRef, context);
if (currentValue == null) {
return true;
}
var eObject = EcoreUtil.resolve(eObjectOrProxy, rootModel);
if (!Objects.equals(currentValue, eObject)) {
return true;
}
if (!ProblemUtil.isImplicit(eObject)) {
return true;
}
if (rootModel instanceof Problem problem) {
return referenceCounter.countReferences(problem, eObject) >= 2;
}
return true;
}
protected boolean shouldBeVisible(IEObjectDescription candidate, CrossReference crossReference,
ContentAssistContext context) {
if (NamingUtil.isFullyQualified(candidate.getName()) &&
!context.getPrefix().startsWith(ProblemQualifiedNameConverter.DELIMITER)) {
// Do not propose names with a root prefix unless explicitly asked for.
return false;
}
var errorPredicate = candidate.getUserData(ProblemResourceDescriptionStrategy.ERROR_PREDICATE);
if (ProblemResourceDescriptionStrategy.ERROR_PREDICATE_TRUE.equals(errorPredicate)) {
return false;
}
var eReference = getEReference(crossReference);
if (eReference == null) {
return true;
}
if (eReference == ProblemPackage.Literals.IMPORT_STATEMENT__IMPORTED_MODULE) {
return importedModuleShouldBeVisible(candidate, context);
}
var candidateEObjectOrProxy = candidate.getEObjectOrProxy();
if (eReference.equals(ProblemPackage.Literals.REFERENCE_DECLARATION__OPPOSITE) &&
candidateEObjectOrProxy instanceof ReferenceDeclaration candidateReferenceDeclaration) {
return oppositeShouldBeVisible(candidateReferenceDeclaration, context);
}
var builtinSymbolsOption = desugarer.getBuiltinSymbols(context.getRootModel());
if (builtinSymbolsOption.isEmpty()) {
return true;
}
var builtinSymbols = builtinSymbolsOption.get();
return builtinSymbolAwareShouldBeVisible(candidate, context, eReference, builtinSymbols,
candidateEObjectOrProxy);
}
private boolean importedModuleShouldBeVisible(IEObjectDescription candidate, ContentAssistContext context) {
var moduleKind = candidate.getUserData(ProblemResourceDescriptionStrategy.MODULE_KIND);
if (!ModuleKind.MODULE.getName().equals(moduleKind)) {
return false;
}
var resource = context.getResource();
var candidateResourceUri = candidate.getEObjectURI().trimFragment();
if (candidateResourceUri.equals(resource.getURI())) {
return false;
}
var imports = importCollector.getDirectImports(resource);
return !imports.toUriSet().contains(candidateResourceUri);
}
private static boolean oppositeShouldBeVisible(ReferenceDeclaration candidateReferenceDeclaration,
ContentAssistContext context) {
var referenceDeclaration = EcoreUtil2.getContainerOfType(context.getCurrentModel(),
ReferenceDeclaration.class);
if (referenceDeclaration == null) {
return true;
}
var classDeclaration = EcoreUtil2.getContainerOfType(referenceDeclaration, ClassDeclaration.class);
if (classDeclaration == null) {
return true;
}
var oppositeType = candidateReferenceDeclaration.getReferenceType();
if (oppositeType == null) {
return true;
}
var resolvedOppositeType = EcoreUtil.resolve(oppositeType, candidateReferenceDeclaration);
return classDeclaration.equals(resolvedOppositeType);
}
private boolean builtinSymbolAwareShouldBeVisible(
IEObjectDescription candidate, ContentAssistContext context, EReference eReference,
BuiltinSymbols builtinSymbols, EObject candidateEObjectOrProxy) {
if (eReference.equals(ProblemPackage.Literals.REFERENCE_DECLARATION__REFERENCE_TYPE) &&
context.getCurrentModel() instanceof ReferenceDeclaration referenceDeclaration &&
(referenceDeclaration.getKind() == ReferenceKind.CONTAINMENT ||
referenceDeclaration.getKind() == ReferenceKind.CONTAINER)) {
// Containment or container references must have a class type.
// We don't support {@code node} as a container or contained type.
return ProblemPackage.Literals.CLASS_DECLARATION.isSuperTypeOf(candidate.getEClass()) &&
!builtinSymbols.node().equals(candidateEObjectOrProxy);
}
if (eReference.equals(ProblemPackage.Literals.REFERENCE_DECLARATION__REFERENCE_TYPE) ||
eReference.equals(ProblemPackage.Literals.PARAMETER__PARAMETER_TYPE) ||
eReference.equals(ProblemPackage.Literals.TYPE_SCOPE__TARGET_TYPE)) {
if (builtinSymbols.exists().equals(candidateEObjectOrProxy)) {
return false;
}
var arity = candidate.getUserData(ProblemResourceDescriptionStrategy.ARITY);
return arity == null || arity.equals("1");
}
if (eReference.equals(ProblemPackage.Literals.CLASS_DECLARATION__SUPER_TYPES)) {
return supertypeShouldBeVisible(candidate, context, builtinSymbols, candidateEObjectOrProxy);
}
return true;
}
private boolean supertypeShouldBeVisible(IEObjectDescription candidate, ContentAssistContext context,
BuiltinSymbols builtinSymbols, EObject candidateEObjectOrProxy) {
if (!ProblemPackage.Literals.CLASS_DECLARATION.isSuperTypeOf(candidate.getEClass()) ||
builtinSymbols.node().equals(candidateEObjectOrProxy) ||
builtinSymbols.contained().equals(candidateEObjectOrProxy)) {
return false;
}
if (context.getCurrentModel() instanceof ClassDeclaration classDeclaration &&
candidateEObjectOrProxy instanceof ClassDeclaration candidateClassDeclaration) {
return !classDeclaration.equals(candidateClassDeclaration) &&
!classDeclaration.getSuperTypes().contains(candidateClassDeclaration);
}
return true;
}
@Nullable
private EReference getEReference(CrossReference crossReference) {
var type = currentTypeFinder.findCurrentTypeAfter(crossReference);
if (!(type instanceof EClass eClass)) {
return null;
}
return GrammarUtil.getReference(crossReference, eClass);
}
protected EObject getCurrentValue(CrossReference crossRef, ContentAssistContext context) {
var value = getCurrentValue(crossRef, context.getCurrentModel());
if (value != null) {
return value;
}
var currentNodeSemanticObject = NodeModelUtils.findActualSemanticObjectFor(context.getCurrentNode());
return getCurrentValue(crossRef, currentNodeSemanticObject);
}
protected EObject getCurrentValue(CrossReference crossRef, EObject context) {
if (context == null) {
return null;
}
var eReference = GrammarUtil.getReference(crossRef, context.eClass());
if (eReference == null || eReference.isMany()) {
return null;
}
return (EObject) context.eGet(eReference);
}
}
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