@NotNull
public static <D extends CallableDescriptor, F extends D>
List<ResolutionTask<D, F>> computePrioritizedTasks(
@NotNull BasicResolutionContext context,
@NotNull Name name,
@NotNull JetReferenceExpression functionReference,
@NotNull List<CallableDescriptorCollector<? extends D>> callableDescriptorCollectors) {
ReceiverDescriptor explicitReceiver = context.call.getExplicitReceiver();
final JetScope scope;
if (explicitReceiver.exists() && explicitReceiver.getType() instanceof NamespaceType) {
// Receiver is a namespace
scope = explicitReceiver.getType().getMemberScope();
explicitReceiver = NO_RECEIVER;
} else {
scope = context.scope;
}
final Predicate<ResolutionCandidate<D>> visibleStrategy =
new Predicate<ResolutionCandidate<D>>() {
@Override
public boolean apply(@Nullable ResolutionCandidate<D> call) {
if (call == null) return false;
D candidateDescriptor = call.getDescriptor();
if (ErrorUtils.isError(candidateDescriptor)) return true;
return Visibilities.isVisible(candidateDescriptor, scope.getContainingDeclaration());
}
};
ResolutionTaskHolder<D, F> result =
new ResolutionTaskHolder<D, F>(functionReference, context, visibleStrategy);
for (CallableDescriptorCollector<? extends D> callableDescriptorCollector :
callableDescriptorCollectors) {
doComputeTasks(scope, explicitReceiver, name, result, context, callableDescriptorCollector);
}
return result.getTasks();
}
@Override
public void getImplicitReceiversHierarchy(@NotNull List<ReceiverDescriptor> result) {
checkMayRead();
super.getImplicitReceiversHierarchy(result);
// Imported scopes come with their receivers
// Example: class member resolution scope imports a scope of it's class object
// members of the class object must be able to find it as an implicit receiver
for (JetScope scope : getImports()) {
ReceiverDescriptor definedReceiver = scope.getImplicitReceiver();
if (definedReceiver.exists()) {
result.add(0, definedReceiver);
}
}
}
private static <D extends CallableDescriptor> boolean setImpliedThis(
@NotNull JetScope scope, ResolutionCandidate<D> candidate) {
ReceiverDescriptor expectedThisObject = candidate.getDescriptor().getExpectedThisObject();
if (!expectedThisObject.exists()) return true;
List<ReceiverDescriptor> receivers = Lists.newArrayList();
scope.getImplicitReceiversHierarchy(receivers);
for (ReceiverDescriptor receiver : receivers) {
if (JetTypeChecker.INSTANCE.isSubtypeOf(receiver.getType(), expectedThisObject.getType())) {
// TODO : Autocasts & nullability
candidate.setThisObject(expectedThisObject);
return true;
}
}
return false;
}
/*
* Checks if receiver declaration could be resolved to call expected receiver.
*/
public static boolean checkIsExtensionCallable(
@NotNull ReceiverDescriptor expectedReceiver, @NotNull CallableDescriptor receiverArgument) {
JetType type = expectedReceiver.getType();
if (checkReceiverResolution(expectedReceiver, type, receiverArgument)) return true;
if (type.isNullable()) {
JetType notNullableType = TypeUtils.makeNotNullable(type);
if (checkReceiverResolution(expectedReceiver, notNullableType, receiverArgument)) return true;
}
return false;
}
@Override
public Void visitFunctionDescriptor(FunctionDescriptor descriptor, StringBuilder builder) {
renderVisibility(descriptor.getVisibility(), builder);
renderModality(descriptor.getModality(), builder);
builder.append(renderKeyword("fun")).append(" ");
if (renderTypeParameters(descriptor.getTypeParameters(), builder)) {
builder.append(" ");
}
ReceiverDescriptor receiver = descriptor.getReceiverParameter();
if (receiver.exists()) {
builder.append(escape(renderType(receiver.getType()))).append(".");
}
renderName(descriptor, builder);
renderValueParameters(descriptor, builder);
builder.append(" : ").append(escape(renderType(descriptor.getReturnType())));
renderWhereSuffix(descriptor, builder);
return null;
}
public static <D extends CallableDescriptor>
Collection<ResolutionCandidate<D>> convertWithImpliedThis(
JetScope scope,
Collection<ReceiverDescriptor> receiverParameters,
Collection<? extends D> descriptors) {
Collection<ResolutionCandidate<D>> result = Lists.newArrayList();
for (ReceiverDescriptor receiverParameter : receiverParameters) {
for (D descriptor : descriptors) {
ResolutionCandidate<D> candidate = ResolutionCandidate.create(descriptor);
candidate.setReceiverArgument(receiverParameter);
candidate.setExplicitReceiverKind(
receiverParameter.exists()
? ExplicitReceiverKind.RECEIVER_ARGUMENT
: ExplicitReceiverKind.NO_EXPLICIT_RECEIVER);
if (setImpliedThis(scope, candidate)) {
result.add(candidate);
}
}
}
if (receiverParameters.size() == 1 && !receiverParameters.iterator().next().exists()) {
for (D descriptor : descriptors) {
if (descriptor.getExpectedThisObject().exists()
&& !descriptor.getReceiverParameter().exists()) {
DeclarationDescriptor containingDeclaration = descriptor.getContainingDeclaration();
if (descriptor instanceof ConstructorDescriptor) {
assert containingDeclaration != null;
containingDeclaration = containingDeclaration.getContainingDeclaration();
}
if (containingDeclaration != null && isClassObject(containingDeclaration)) {
ResolutionCandidate<D> candidate = ResolutionCandidate.create(descriptor);
candidate.setThisObject(new ClassReceiver((ClassDescriptor) containingDeclaration));
candidate.setExplicitReceiverKind(ExplicitReceiverKind.NO_EXPLICIT_RECEIVER);
result.add(candidate);
}
}
}
}
return result;
}
private String renderPropertyPrefixAndComputeTypeString(
@NotNull StringBuilder builder,
@Nullable Boolean isVar,
@NotNull List<TypeParameterDescriptor> typeParameters,
@NotNull ReceiverDescriptor receiver,
@Nullable JetType outType) {
String typeString = lt() + "no type>";
if (outType != null) {
if (isVar != null) {
builder.append(renderKeyword(isVar ? "var" : "val")).append(" ");
}
typeString = renderType(outType);
}
renderTypeParameters(typeParameters, builder);
if (receiver.exists()) {
builder.append(escape(renderType(receiver.getType()))).append(".");
}
return typeString;
}
private static boolean checkReceiverResolution(
@NotNull ReceiverDescriptor expectedReceiver,
@NotNull JetType receiverType,
@NotNull CallableDescriptor receiverArgument) {
ConstraintSystem constraintSystem =
new ConstraintSystemImpl(ConstraintResolutionListener.DO_NOTHING);
for (TypeParameterDescriptor typeParameterDescriptor : receiverArgument.getTypeParameters()) {
constraintSystem.registerTypeVariable(typeParameterDescriptor, Variance.INVARIANT);
}
ReceiverDescriptor receiverParameter = receiverArgument.getReceiverParameter();
if (expectedReceiver.exists() && receiverParameter.exists()) {
constraintSystem.addSubtypingConstraint(
ConstraintType.RECEIVER.assertSubtyping(receiverType, receiverParameter.getType()));
} else if (expectedReceiver.exists() || receiverParameter.exists()) {
// Only one of receivers exist
return false;
}
ConstraintSystemSolution solution = constraintSystem.solve();
return solution.getStatus().isSuccessful();
}
@Override
public JetType visitFunctionLiteralExpression(
JetFunctionLiteralExpression expression, ExpressionTypingContext context) {
JetFunctionLiteral functionLiteral = expression.getFunctionLiteral();
JetBlockExpression bodyExpression = functionLiteral.getBodyExpression();
if (bodyExpression == null) return null;
JetType expectedType = context.expectedType;
boolean functionTypeExpected =
expectedType != TypeUtils.NO_EXPECTED_TYPE
&& JetStandardClasses.isFunctionType(expectedType);
NamedFunctionDescriptorImpl functionDescriptor =
createFunctionDescriptor(expression, context, functionTypeExpected);
List<JetType> parameterTypes = Lists.newArrayList();
List<ValueParameterDescriptor> valueParameters = functionDescriptor.getValueParameters();
for (ValueParameterDescriptor valueParameter : valueParameters) {
parameterTypes.add(valueParameter.getOutType());
}
ReceiverDescriptor receiverParameter = functionDescriptor.getReceiverParameter();
JetType receiver = receiverParameter != NO_RECEIVER ? receiverParameter.getType() : null;
JetType returnType = TypeUtils.NO_EXPECTED_TYPE;
JetScope functionInnerScope =
FunctionDescriptorUtil.getFunctionInnerScope(
context.scope, functionDescriptor, context.trace);
JetTypeReference returnTypeRef = functionLiteral.getReturnTypeRef();
if (returnTypeRef != null) {
returnType = context.getTypeResolver().resolveType(context.scope, returnTypeRef);
context
.getServices()
.checkFunctionReturnType(
expression,
context
.replaceScope(functionInnerScope)
.replaceExpectedType(returnType)
.replaceExpectedReturnType(returnType)
.replaceDataFlowInfo(context.dataFlowInfo));
} else {
if (functionTypeExpected) {
returnType = JetStandardClasses.getReturnTypeFromFunctionType(expectedType);
}
returnType =
context
.getServices()
.getBlockReturnedType(
functionInnerScope,
bodyExpression,
CoercionStrategy.COERCION_TO_UNIT,
context.replaceExpectedType(returnType).replaceExpectedReturnType(returnType));
}
JetType safeReturnType =
returnType == null ? ErrorUtils.createErrorType("<return type>") : returnType;
functionDescriptor.setReturnType(safeReturnType);
boolean hasDeclaredValueParameters = functionLiteral.getValueParameterList() != null;
if (!hasDeclaredValueParameters && functionTypeExpected) {
JetType expectedReturnType = JetStandardClasses.getReturnTypeFromFunctionType(expectedType);
if (JetStandardClasses.isUnit(expectedReturnType)) {
functionDescriptor.setReturnType(JetStandardClasses.getUnitType());
return DataFlowUtils.checkType(
JetStandardClasses.getFunctionType(
Collections.<AnnotationDescriptor>emptyList(),
receiver,
parameterTypes,
JetStandardClasses.getUnitType()),
expression,
context);
}
}
return DataFlowUtils.checkType(
JetStandardClasses.getFunctionType(
Collections.<AnnotationDescriptor>emptyList(),
receiver,
parameterTypes,
safeReturnType),
expression,
context);
}
private static <D extends CallableDescriptor, F extends D> void doComputeTasks(
@NotNull JetScope scope,
@NotNull ReceiverDescriptor receiver,
@NotNull Name name,
@NotNull ResolutionTaskHolder<D, F> result,
@NotNull BasicResolutionContext context,
@NotNull CallableDescriptorCollector<? extends D> callableDescriptorCollector) {
ProgressIndicatorProvider.checkCanceled();
AutoCastServiceImpl autoCastService =
new AutoCastServiceImpl(context.dataFlowInfo, context.trace.getBindingContext());
List<ReceiverDescriptor> implicitReceivers = Lists.newArrayList();
scope.getImplicitReceiversHierarchy(implicitReceivers);
boolean hasExplicitThisObject = context.call.getThisObject().exists();
if (hasExplicitThisObject) {
implicitReceivers.add(context.call.getThisObject());
}
if (receiver.exists()) {
List<ReceiverDescriptor> variantsForExplicitReceiver =
autoCastService.getVariantsForReceiver(receiver);
Collection<ResolutionCandidate<D>> extensionFunctions =
convertWithImpliedThis(
scope,
variantsForExplicitReceiver,
callableDescriptorCollector.getNonMembersByName(scope, name));
List<ResolutionCandidate<D>> nonlocals = Lists.newArrayList();
List<ResolutionCandidate<D>> locals = Lists.newArrayList();
//noinspection unchecked,RedundantTypeArguments
TaskPrioritizer.<D>splitLexicallyLocalDescriptors(
extensionFunctions, scope.getContainingDeclaration(), locals, nonlocals);
Collection<ResolutionCandidate<D>> members = Lists.newArrayList();
for (ReceiverDescriptor variant : variantsForExplicitReceiver) {
Collection<? extends D> membersForThisVariant =
callableDescriptorCollector.getMembersByName(variant.getType(), name);
convertWithReceivers(
membersForThisVariant,
Collections.singletonList(variant),
Collections.singletonList(NO_RECEIVER),
members,
hasExplicitThisObject);
}
result.addLocalExtensions(locals);
result.addMembers(members);
for (ReceiverDescriptor implicitReceiver : implicitReceivers) {
Collection<? extends D> memberExtensions =
callableDescriptorCollector.getNonMembersByName(
implicitReceiver.getType().getMemberScope(), name);
List<ReceiverDescriptor> variantsForImplicitReceiver =
autoCastService.getVariantsForReceiver(implicitReceiver);
result.addNonLocalExtensions(
convertWithReceivers(
memberExtensions,
variantsForImplicitReceiver,
variantsForExplicitReceiver,
hasExplicitThisObject));
}
result.addNonLocalExtensions(nonlocals);
} else {
Collection<ResolutionCandidate<D>> functions =
convertWithImpliedThis(
scope,
Collections.singletonList(receiver),
callableDescriptorCollector.getNonExtensionsByName(scope, name));
List<ResolutionCandidate<D>> nonlocals = Lists.newArrayList();
List<ResolutionCandidate<D>> locals = Lists.newArrayList();
//noinspection unchecked,RedundantTypeArguments
TaskPrioritizer.<D>splitLexicallyLocalDescriptors(
functions, scope.getContainingDeclaration(), locals, nonlocals);
result.addLocalExtensions(locals);
result.addNonLocalExtensions(nonlocals);
for (ReceiverDescriptor implicitReceiver : implicitReceivers) {
doComputeTasks(scope, implicitReceiver, name, result, context, callableDescriptorCollector);
}
}
}