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/*
* SPDX-FileCopyrightText: 2021-2023 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.EObject;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.xtext.CrossReference;
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.naming.QualifiedName;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.scoping.IScope;
import tools.refinery.language.model.problem.Problem;
import tools.refinery.language.resource.ProblemResourceDescriptionStrategy;
import tools.refinery.language.resource.ReferenceCounter;
import tools.refinery.language.utils.ProblemUtil;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Objects;
public class ProblemCrossrefProposalProvider extends IdeCrossrefProposalProvider {
@Inject
private ReferenceCounter referenceCounter;
@Override
protected Iterable<IEObjectDescription> queryScope(IScope scope, CrossReference crossReference,
ContentAssistContext context) {
var eObjectDescriptionsByName = new HashMap<QualifiedName, List<IEObjectDescription>>();
for (var candidate : super.queryScope(scope, crossReference, context)) {
if (isExistingObject(candidate, crossReference, context)) {
// {@code getQualifiedName()} will refer to the full name for objects that are loaded from the global
// scope, but {@code getName()} returns the qualified name that we set in
// {@code ProblemResourceDescriptionStrategy}.
var qualifiedName = candidate.getName();
var candidateList = eObjectDescriptionsByName.computeIfAbsent(qualifiedName,
ignored -> new ArrayList<>());
candidateList.add(candidate);
}
}
var eObjectDescriptions = new ArrayList<IEObjectDescription>();
for (var candidates : eObjectDescriptionsByName.values()) {
if (candidates.size() == 1) {
var candidate = candidates.get(0);
if (shouldBeVisible(candidate)) {
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) {
var errorPredicate = candidate.getUserData(ProblemResourceDescriptionStrategy.ERROR_PREDICATE);
return !ProblemResourceDescriptionStrategy.ERROR_PREDICATE_TRUE.equals(errorPredicate);
}
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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