public PyType getType(@NotNull TypeEvalContext context, @NotNull TypeEvalContext.Key key) {
if (!TypeEvalStack.mayEvaluate(this)) {
return null;
}
try {
final boolean qualified = isQualified();
if (!qualified) {
String name = getReferencedName();
if (PyNames.NONE.equals(name)) {
return PyNoneType.INSTANCE;
}
}
PyType type = getTypeFromProviders(context);
if (type != null) {
return type;
}
if (qualified) {
PyType maybe_type = PyUtil.getSpecialAttributeType(this, context);
if (maybe_type != null) return maybe_type;
Ref<PyType> typeOfProperty = getTypeOfProperty(context);
if (typeOfProperty != null) {
return typeOfProperty.get();
}
}
final PsiPolyVariantReference reference =
getReference(PyResolveContext.noImplicits().withTypeEvalContext(context));
final List<PsiElement> targets = PyUtil.multiResolveTopPriority(reference);
if (targets.isEmpty()) {
return getQualifiedReferenceTypeByControlFlow(context);
}
final List<PyType> members = new ArrayList<PyType>();
for (PsiElement target : targets) {
if (target == this || target == null) {
continue;
}
if (!target.isValid()) {
LOG.error(
"Reference "
+ this
+ " resolved to invalid element "
+ target
+ " (text="
+ target.getText()
+ ")");
continue;
}
members.add(getTypeFromTarget(target, context, this));
}
return PyUnionType.union(members);
} finally {
TypeEvalStack.evaluated(this);
}
}
@Nullable
public static PyType getTypeFromTarget(
@NotNull final PsiElement target,
final TypeEvalContext context,
PyReferenceExpression anchor) {
if (!(target
instanceof PyTargetExpression)) { // PyTargetExpression will ask about its type itself
final PyType pyType = getReferenceTypeFromProviders(target, context, anchor);
if (pyType != null) {
return pyType;
}
}
if (target instanceof PyTargetExpression) {
final String name = ((PyTargetExpression) target).getName();
if (PyNames.NONE.equals(name)) {
return PyNoneType.INSTANCE;
}
if (PyNames.TRUE.equals(name) || PyNames.FALSE.equals(name)) {
return PyBuiltinCache.getInstance(target).getBoolType();
}
}
if (target instanceof PyFile) {
return new PyModuleType((PyFile) target);
}
if (target instanceof PyImportedModule) {
return new PyImportedModuleType((PyImportedModule) target);
}
if ((target instanceof PyTargetExpression || target instanceof PyNamedParameter)
&& anchor != null
&& context.allowDataFlow(anchor)) {
final ScopeOwner scopeOwner = PsiTreeUtil.getStubOrPsiParentOfType(anchor, ScopeOwner.class);
if (scopeOwner != null
&& scopeOwner == PsiTreeUtil.getStubOrPsiParentOfType(target, ScopeOwner.class)) {
final String name = ((PyElement) target).getName();
if (name != null) {
final PyType type = getTypeByControlFlow(name, context, anchor, scopeOwner);
if (type != null) {
return type;
}
}
}
}
if (target instanceof PyFunction) {
final PyDecoratorList decoratorList = ((PyFunction) target).getDecoratorList();
if (decoratorList != null) {
final PyDecorator propertyDecorator = decoratorList.findDecorator(PyNames.PROPERTY);
if (propertyDecorator != null) {
return PyBuiltinCache.getInstance(target).getObjectType(PyNames.PROPERTY);
}
for (PyDecorator decorator : decoratorList.getDecorators()) {
final QualifiedName qName = decorator.getQualifiedName();
if (qName != null
&& (qName.endsWith(PyNames.SETTER)
|| qName.endsWith(PyNames.DELETER)
|| qName.endsWith(PyNames.GETTER))) {
return PyBuiltinCache.getInstance(target).getObjectType(PyNames.PROPERTY);
}
}
}
}
if (target instanceof PyTypedElement) {
return context.getType((PyTypedElement) target);
}
if (target instanceof PsiDirectory) {
final PsiDirectory dir = (PsiDirectory) target;
PsiFile file = dir.findFile(PyNames.INIT_DOT_PY);
if (file != null) {
return getTypeFromTarget(file, context, anchor);
}
if (PyUtil.isPackage(dir, anchor)) {
final PsiFile containingFile = anchor.getContainingFile();
if (containingFile instanceof PyFile) {
final QualifiedName qualifiedName = QualifiedNameFinder.findShortestImportableQName(dir);
if (qualifiedName != null) {
final PyImportedModule module =
new PyImportedModule(null, (PyFile) containingFile, qualifiedName);
return new PyImportedModuleType(module);
}
}
}
}
return null;
}