@NotNull
private static List<PsiElement> calculateResolveModule(@NotNull ResolveModuleParams params) {
final QualifiedName qualifiedName = params.getName();
final int relativeLevel = params.getLevel();
final PsiFile sourceFile = params.getFile();
final boolean importIsAbsolute = params.isAbsolute();
final String marker = qualifiedName + "#" + Integer.toString(relativeLevel);
final Set<String> beingImported = ourBeingImported.get();
if (beingImported.contains(marker)) {
return Collections.emptyList(); // break endless loop in import
}
try {
beingImported.add(marker);
final QualifiedNameResolver visitor =
new QualifiedNameResolverImpl(qualifiedName).fromElement(sourceFile);
if (relativeLevel > 0) {
// "from ...module import"
visitor.withRelative(relativeLevel).withoutRoots();
} else {
// "from module import"
if (!importIsAbsolute) {
visitor.withRelative(0);
}
}
return visitor.resultsAsList();
} finally {
beingImported.remove(marker);
}
}
@Nullable
public static PsiElement resolveModuleInRoots(
@NotNull QualifiedName moduleQualifiedName, @Nullable PsiElement foothold) {
if (foothold == null) return null;
QualifiedNameResolver visitor =
new QualifiedNameResolverImpl(moduleQualifiedName).fromElement(foothold);
return visitor.firstResult();
}