protected boolean isValidIntroduceContext(PsiElement element) {
PyDecorator decorator = PsiTreeUtil.getParentOfType(element, PyDecorator.class);
if (decorator != null && PsiTreeUtil.isAncestor(decorator.getCallee(), element, false)) {
return false;
}
return PsiTreeUtil.getParentOfType(element, PyParameterList.class) == null;
}
@Nullable
private static PsiElement resolveDecorator(@NotNull PyDecorator decorator) {
final PyExpression callee = decorator.getCallee();
if (callee == null) {
return null;
}
final PsiReference reference = callee.getReference();
if (reference == null) {
return null;
}
return reference.resolve();
}
/**
* Map decorators of element to {@link
* com.jetbrains.python.psi.PyKnownDecoratorUtil.KnownDecorator}.
*
* @param element decoratable element to check
* @param context type evaluation context. If it doesn't allow switch to AST, decorators will be
* compared by the text of the last component of theirs qualified names.
* @return list of known decorators in declaration order with duplicates (with any)
*/
@NotNull
public static List<KnownDecorator> getKnownDecorators(
@NotNull PyDecoratable element, @NotNull TypeEvalContext context) {
final PyDecoratorList decoratorList = element.getDecoratorList();
if (decoratorList == null) {
return Collections.emptyList();
}
final List<KnownDecorator> result = new ArrayList<>();
final boolean allowResolve = context.maySwitchToAST((PsiElement) element);
for (PyDecorator decorator : decoratorList.getDecorators()) {
final QualifiedName qualifiedName = decorator.getQualifiedName();
if (qualifiedName == null) {
continue;
}
final KnownDecorator knownDecorator = ourByShortName.get(qualifiedName.getLastComponent());
if (knownDecorator != null) {
if (allowResolve) {
PyQualifiedNameOwner resolved =
as(resolveDecorator(decorator), PyQualifiedNameOwner.class);
if (resolved instanceof PyFunction && PyNames.INIT.equals(resolved.getName())) {
resolved = ((PyFunction) resolved).getContainingClass();
}
if (resolved != null && resolved.getQualifiedName() != null) {
final QualifiedName resolvedName =
QualifiedName.fromDottedString(resolved.getQualifiedName());
if (resolvedName.equals(knownDecorator.getQualifiedName())) {
result.add(knownDecorator);
}
}
} else {
result.add(knownDecorator);
}
}
}
return result;
}
/**
* When a function is decorated many decorators, finds the deepest builtin decorator:
*
* <pre>
* @foo
* @classmethod <b># <-- that's it</b>
* @bar
* def moo(cls):
* pass
* </pre>
*
* @return name of the built-in decorator, or null (even if there are non-built-in decorators).
*/
@Nullable
private String getClassOrStaticMethodDecorator() {
PyDecoratorList decolist = getDecoratorList();
if (decolist != null) {
PyDecorator[] decos = decolist.getDecorators();
if (decos.length > 0) {
for (int i = decos.length - 1; i >= 0; i -= 1) {
PyDecorator deco = decos[i];
String deconame = deco.getName();
if (PyNames.CLASSMETHOD.equals(deconame) || PyNames.STATICMETHOD.equals(deconame)) {
return deconame;
}
for (PyKnownDecoratorProvider provider :
PyUtil.KnownDecoratorProviderHolder.KNOWN_DECORATOR_PROVIDERS) {
String name = provider.toKnownDecorator(deconame);
if (name != null) {
return name;
}
}
}
}
}
return null;
}
@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;
}