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/*
* SPDX-FileCopyrightText: 2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.scoping.imports;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.xtext.linking.impl.LinkingHelper;
import org.eclipse.xtext.naming.IQualifiedNameConverter;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.util.IResourceScopeCache;
import tools.refinery.language.model.problem.ImportStatement;
import tools.refinery.language.model.problem.Problem;
import tools.refinery.language.model.problem.ProblemPackage;
import tools.refinery.language.naming.NamingUtil;
import tools.refinery.language.resource.LoadOnDemandResourceDescriptionProvider;
import tools.refinery.language.resource.ProblemResourceDescriptionStrategy;
import java.util.*;
@Singleton
public class ImportCollector {
private static final String PREFIX = "tools.refinery.language.imports.";
private static final String DIRECT_IMPORTS_KEY = PREFIX + "DIRECT_IMPORTS";
private static final String ALL_IMPORTS_KEY = PREFIX + "ALL_IMPORTS";
@Inject
private IResourceScopeCache cache;
@Inject
private LinkingHelper linkingHelper;
@Inject
private IQualifiedNameConverter qualifiedNameConverter;
@Inject
private Provider<LoadOnDemandResourceDescriptionProvider> loadOnDemandProvider;
@Inject
private ImportAdapterProvider importAdapterProvider;
public ImportCollection getDirectImports(Resource resource) {
return cache.get(DIRECT_IMPORTS_KEY, resource, () -> this.computeDirectImports(resource));
}
protected ImportCollection computeDirectImports(Resource resource) {
if (resource.getContents().isEmpty() || !(resource.getContents().getFirst() instanceof Problem problem)) {
return ImportCollection.EMPTY;
}
var resourceSet = resource.getResourceSet();
if (resourceSet == null) {
return ImportCollection.EMPTY;
}
var adapter = importAdapterProvider.getOrInstall(resourceSet);
var collection = new ImportCollection();
collectAutomaticImports(collection, adapter);
collectExplicitImports(problem, collection, adapter);
collection.remove(resource.getURI());
return collection;
}
private void collectAutomaticImports(ImportCollection importCollection, ImportAdapter adapter) {
for (var library : adapter.getLibraries()) {
for (var qualifiedName : library.getAutomaticImports()) {
var uri = adapter.resolveQualifiedName(qualifiedName);
if (uri != null) {
importCollection.add(NamedImport.implicit(uri, qualifiedName));
}
}
}
}
private void collectExplicitImports(Problem problem, ImportCollection collection, ImportAdapter adapter) {
for (var statement : problem.getStatements()) {
if (statement instanceof ImportStatement importStatement) {
collectImportStatement(importStatement, collection, adapter);
}
}
}
private void collectImportStatement(ImportStatement importStatement, ImportCollection collection,
ImportAdapter adapter) {
var nodes = NodeModelUtils.findNodesForFeature(importStatement,
ProblemPackage.Literals.IMPORT_STATEMENT__IMPORTED_MODULE);
var aliasString = importStatement.getAlias();
var alias = Strings.isNullOrEmpty(aliasString) ? QualifiedName.EMPTY :
NamingUtil.stripRootPrefix(qualifiedNameConverter.toQualifiedName(aliasString));
var referredProblem = (EObject) importStatement.eGet(ProblemPackage.Literals.IMPORT_STATEMENT__IMPORTED_MODULE,
false);
URI referencedUri = null;
if (referredProblem != null && !referredProblem.eIsProxy()) {
var resource = referredProblem.eResource();
if (resource != null) {
referencedUri = resource.getURI();
}
}
for (var node : nodes) {
var qualifiedNameString = linkingHelper.getCrossRefNodeAsString(node, true);
if (Strings.isNullOrEmpty(qualifiedNameString)) {
continue;
}
var qualifiedName = NamingUtil.stripRootPrefix(
qualifiedNameConverter.toQualifiedName(qualifiedNameString));
var uri = referencedUri == null ? adapter.resolveQualifiedName(qualifiedName) : referencedUri;
if (uri != null) {
collection.add(NamedImport.explicit(uri, qualifiedName, List.of(alias)));
}
}
}
public ImportCollection getAllImports(Resource resource) {
return cache.get(ALL_IMPORTS_KEY, resource, () -> this.computeAllImports(resource));
}
protected ImportCollection computeAllImports(Resource resource) {
var collection = new ImportCollection();
collection.addAll(getDirectImports(resource).toList());
var loadOnDemand = loadOnDemandProvider.get();
loadOnDemand.setContext(resource);
var seen = new HashSet<URI>();
seen.add(resource.getURI());
var queue = new ArrayDeque<>(collection.toUriSet());
while (!queue.isEmpty()) {
var uri = queue.removeFirst();
seen.add(uri);
collection.add(new TransitiveImport(uri));
var resourceDescription = loadOnDemand.getResourceDescription(uri);
if (resourceDescription == null) {
continue;
}
var problemDescriptions = resourceDescription.getExportedObjectsByType(ProblemPackage.Literals.PROBLEM);
for (var eObjectDescription : problemDescriptions) {
for (var importedUri : getImports(eObjectDescription)) {
if (!seen.contains(importedUri)) {
queue.addLast(importedUri);
}
}
}
}
collection.remove(resource.getURI());
return collection;
}
protected List<URI> getImports(IEObjectDescription eObjectDescription) {
var importString = eObjectDescription.getUserData(ProblemResourceDescriptionStrategy.IMPORTS);
if (importString == null || importString.isEmpty()) {
return List.of();
}
return Splitter.on(ProblemResourceDescriptionStrategy.IMPORTS_SEPARATOR).splitToStream(importString)
.map(URI::createURI)
.toList();
}
}
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