@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;
}
@Override
public void visitPyReferenceExpression(final PyReferenceExpression node) {
if (node.getContainingFile() instanceof PyExpressionCodeFragment) {
return;
}
// Ignore global statements arguments
if (PyGlobalStatementNavigator.getByArgument(node) != null) {
return;
}
// Ignore qualifier inspections
if (node.getQualifier() != null) {
return;
}
// Ignore import subelements
if (PsiTreeUtil.getParentOfType(node, PyImportStatementBase.class) != null) {
return;
}
final String name = node.getReferencedName();
if (name == null) {
return;
}
final ScopeOwner owner = ScopeUtil.getDeclarationScopeOwner(node, name);
final Set<ScopeOwner> largeFunctions = getSession().getUserData(LARGE_FUNCTIONS_KEY);
assert largeFunctions != null;
if (owner == null || largeFunctions.contains(owner)) {
return;
}
// Ignore references declared in outer scopes
if (owner != ScopeUtil.getScopeOwner(node)) {
return;
}
final Scope scope = ControlFlowCache.getScope(owner);
// Ignore globals and if scope even doesn't contain such a declaration
if (scope.isGlobal(name) || (!scope.containsDeclaration(name))) {
return;
}
// Start DFA from the assignment statement in case of augmented assignments
final PsiElement anchor;
final PyAugAssignmentStatement augAssignment =
PsiTreeUtil.getParentOfType(node, PyAugAssignmentStatement.class);
if (augAssignment != null && name.equals(augAssignment.getTarget().getName())) {
anchor = augAssignment;
} else {
anchor = node;
}
final ScopeVariable variable;
try {
variable = scope.getDeclaredVariable(anchor, name);
} catch (DFALimitExceededException e) {
largeFunctions.add(owner);
registerLargeFunction(owner);
return;
}
if (variable == null) {
if (!isFirstUnboundRead(node, owner)) {
return;
}
final PsiPolyVariantReference ref = node.getReference(resolveWithoutImplicits());
if (ref == null) {
return;
}
final PsiElement resolved = ref.resolve();
final boolean isBuiltin = PyBuiltinCache.getInstance(node).hasInBuiltins(resolved);
if (owner instanceof PyClass) {
if (isBuiltin || ScopeUtil.getDeclarationScopeOwner(owner, name) != null) {
return;
}
}
if (PyUnreachableCodeInspection.hasAnyInterruptedControlFlowPaths(node)) {
return;
}
if (owner instanceof PyFile) {
if (isBuiltin) {
return;
}
if (resolved != null && !PyUtil.inSameFile(node, resolved)) {
return;
}
registerProblem(node, PyBundle.message("INSP.unbound.name.not.defined", name));
} else {
registerProblem(
node,
PyBundle.message("INSP.unbound.local.variable", node.getName()),
ProblemHighlightType.GENERIC_ERROR_OR_WARNING,
null,
new AddGlobalQuickFix());
}
}
}