@NotNull
public QualifiedResolveResult followAssignmentsChain(PyResolveContext resolveContext) {
PyReferenceExpression seeker = this;
QualifiedResolveResult ret = null;
List<PyExpression> qualifiers = new ArrayList<PyExpression>();
PyExpression qualifier = seeker.getQualifier();
if (qualifier != null) {
qualifiers.add(qualifier);
}
Set<PsiElement> visited = new HashSet<PsiElement>();
visited.add(this);
SEARCH:
while (ret == null) {
ResolveResult[] targets = seeker.getReference(resolveContext).multiResolve(false);
for (ResolveResult target : targets) {
PsiElement elt = target.getElement();
if (elt instanceof PyTargetExpression) {
PsiElement assigned_from = null;
final PyTargetExpression expr = (PyTargetExpression) elt;
final TypeEvalContext context = resolveContext.getTypeEvalContext();
if (context.maySwitchToAST(expr) || expr.getStub() == null) {
assigned_from = expr.findAssignedValue();
}
// TODO: Maybe findAssignedValueByStub() should become a part of the PyTargetExpression
// interface
else if (elt instanceof PyTargetExpressionImpl) {
assigned_from = ((PyTargetExpressionImpl) elt).findAssignedValueByStub(context);
}
if (assigned_from instanceof PyReferenceExpression) {
if (visited.contains(assigned_from)) {
break;
}
visited.add(assigned_from);
seeker = (PyReferenceExpression) assigned_from;
if (seeker.getQualifier() != null) {
qualifiers.add(seeker.getQualifier());
}
continue SEARCH;
} else if (assigned_from != null)
ret = new QualifiedResolveResultImpl(assigned_from, qualifiers, false);
} else if (ret == null && elt instanceof PyElement && target.isValidResult()) {
// remember this result, but a further reference may be the next resolve result
ret =
new QualifiedResolveResultImpl(
elt, qualifiers, target instanceof ImplicitResolveResult);
}
}
// all resolve results checked, reassignment not detected, nothing more to do
break;
}
if (ret == null) ret = EMPTY_RESULT;
return ret;
}
@Nullable
public static String extractDeprecationMessage(List<PyStatement> statements) {
for (PyStatement statement : statements) {
if (statement instanceof PyExpressionStatement) {
PyExpressionStatement expressionStatement = (PyExpressionStatement) statement;
if (expressionStatement.getExpression() instanceof PyCallExpression) {
PyCallExpression callExpression = (PyCallExpression) expressionStatement.getExpression();
if (callExpression.isCalleeText(PyNames.WARN)) {
PyReferenceExpression warningClass =
callExpression.getArgument(1, PyReferenceExpression.class);
if (warningClass != null
&& (PyNames.DEPRECATION_WARNING.equals(warningClass.getReferencedName())
|| PyNames.PENDING_DEPRECATION_WARNING.equals(
warningClass.getReferencedName()))) {
return PyPsiUtils.strValue(callExpression.getArguments()[0]);
}
}
}
}
}
return null;
}
@NotNull
private static List<PsiElement> tryResolving(
@NotNull PyExpression expression, @NotNull TypeEvalContext context) {
final List<PsiElement> elements = Lists.newArrayList();
if (expression instanceof PyReferenceExpression) {
final PyReferenceExpression referenceExpr = (PyReferenceExpression) expression;
final PyResolveContext resolveContext =
PyResolveContext.noImplicits().withTypeEvalContext(context);
final PsiPolyVariantReference reference = referenceExpr.getReference(resolveContext);
final List<PsiElement> resolved = PyUtil.multiResolveTopPriority(reference);
for (PsiElement element : resolved) {
if (element instanceof PyFunction) {
final PyFunction function = (PyFunction) element;
if (PyUtil.isInit(function)) {
final PyClass cls = function.getContainingClass();
if (cls != null) {
elements.add(cls);
continue;
}
}
} else if (element instanceof PyTargetExpression) {
final PyTargetExpression targetExpr = (PyTargetExpression) element;
// XXX: Requires switching from stub to AST
final PyExpression assignedValue = targetExpr.findAssignedValue();
if (assignedValue != null) {
elements.add(assignedValue);
continue;
}
}
if (element != null) {
elements.add(element);
}
}
}
return !elements.isEmpty() ? elements : Collections.singletonList(expression);
}
@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;
}
private static PsiElement resolveWithoutImplicits(final PyReferenceExpression element) {
final QualifiedResolveResult resolveResult =
element.followAssignmentsChain(PyResolveContext.noImplicits());
return resolveResult.isImplicit() ? null : resolveResult.getElement();
}