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/*
* SPDX-FileCopyrightText: 2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.language.scoping;
import com.google.common.collect.Iterables;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.naming.QualifiedName;
import org.eclipse.xtext.resource.IEObjectDescription;
import org.eclipse.xtext.resource.ISelectable;
import org.eclipse.xtext.resource.impl.AliasedEObjectDescription;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
class NormalizedSelectable implements ISelectable {
private final ISelectable delegateSelectable;
private final QualifiedName originalPrefix;
private final QualifiedName normalizedPrefix;
public NormalizedSelectable(ISelectable delegateSelectable, QualifiedName originalPrefix,
QualifiedName normalizedPrefix) {
if (originalPrefix.equals(QualifiedName.EMPTY)) {
throw new IllegalArgumentException("Cannot normalize empty qualified name prefix");
}
this.delegateSelectable = delegateSelectable;
this.originalPrefix = originalPrefix;
this.normalizedPrefix = normalizedPrefix;
}
@Override
public boolean isEmpty() {
return delegateSelectable.isEmpty();
}
@Override
public Iterable<IEObjectDescription> getExportedObjects() {
var delegateIterable = delegateSelectable.getExportedObjects();
return getAliasedElements(delegateIterable);
}
@Override
public Iterable<IEObjectDescription> getExportedObjects(EClass type, QualifiedName name, boolean ignoreCase) {
boolean startsWith = ignoreCase ? name.startsWithIgnoreCase(normalizedPrefix) :
name.startsWith(normalizedPrefix);
if (startsWith && name.getSegmentCount() > normalizedPrefix.getSegmentCount()) {
var originalName = originalPrefix.append(name.skipFirst(normalizedPrefix.getSegmentCount()));
return Iterables.transform(
delegateSelectable.getExportedObjects(type, originalName, ignoreCase),
description -> {
var normalizedName = normalizedPrefix.append(
description.getName().skipFirst(originalPrefix.getSegmentCount()));
return new AliasedEObjectDescription(normalizedName, description);
});
}
return List.of();
}
@Override
public Iterable<IEObjectDescription> getExportedObjectsByType(EClass type) {
var delegateIterable = delegateSelectable.getExportedObjectsByType(type);
return getAliasedElements(delegateIterable);
}
@Override
public Iterable<IEObjectDescription> getExportedObjectsByObject(EObject object) {
var delegateIterable = delegateSelectable.getExportedObjectsByObject(object);
return getAliasedElements(delegateIterable);
}
private Iterable<IEObjectDescription> getAliasedElements(Iterable<IEObjectDescription> delegateIterable) {
return () -> new Iterator<>() {
private final Iterator<IEObjectDescription> delegateIterator = delegateIterable.iterator();
private IEObjectDescription next = computeNext();
@Override
public boolean hasNext() {
return next != null;
}
@Override
public IEObjectDescription next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
var current = next;
next = computeNext();
return current;
}
private IEObjectDescription computeNext() {
while (delegateIterator.hasNext()) {
var description = delegateIterator.next();
var qualifiedName = description.getName();
if (qualifiedName.startsWith(originalPrefix) &&
qualifiedName.getSegmentCount() > originalPrefix.getSegmentCount()) {
var alias = normalizedPrefix.append(qualifiedName.skipFirst(originalPrefix.getSegmentCount()));
return new AliasedEObjectDescription(alias, description);
}
}
return null;
}
};
}
}
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