private List<ValueParameterDescriptor> createValueParameterDescriptors(
ExpressionTypingContext context,
JetFunctionLiteral functionLiteral,
FunctionDescriptorImpl functionDescriptor,
boolean functionTypeExpected) {
List<ValueParameterDescriptor> valueParameterDescriptors = Lists.newArrayList();
List<JetParameter> declaredValueParameters = functionLiteral.getValueParameters();
List<ValueParameterDescriptor> expectedValueParameters =
(functionTypeExpected)
? JetStandardClasses.getValueParameters(functionDescriptor, context.expectedType)
: null;
boolean hasDeclaredValueParameters = functionLiteral.getValueParameterList() != null;
if (functionTypeExpected
&& !hasDeclaredValueParameters
&& expectedValueParameters.size() == 1) {
ValueParameterDescriptor valueParameterDescriptor = expectedValueParameters.get(0);
ValueParameterDescriptor it =
new ValueParameterDescriptorImpl(
functionDescriptor,
0,
Collections.<AnnotationDescriptor>emptyList(),
"it",
false,
valueParameterDescriptor.getOutType(),
valueParameterDescriptor.hasDefaultValue(),
valueParameterDescriptor.getVarargElementType());
valueParameterDescriptors.add(it);
context.trace.record(AUTO_CREATED_IT, it);
} else {
for (int i = 0; i < declaredValueParameters.size(); i++) {
JetParameter declaredParameter = declaredValueParameters.get(i);
JetTypeReference typeReference = declaredParameter.getTypeReference();
JetType type;
if (typeReference != null) {
type = context.getTypeResolver().resolveType(context.scope, typeReference);
} else {
if (expectedValueParameters != null && i < expectedValueParameters.size()) {
type = expectedValueParameters.get(i).getOutType();
} else {
context.trace.report(CANNOT_INFER_PARAMETER_TYPE.on(declaredParameter));
type = ErrorUtils.createErrorType("Cannot be inferred");
}
}
ValueParameterDescriptor valueParameterDescriptor =
context
.getDescriptorResolver()
.resolveValueParameterDescriptor(functionDescriptor, declaredParameter, i, type);
valueParameterDescriptors.add(valueParameterDescriptor);
}
}
return valueParameterDescriptors;
}
private NamedFunctionDescriptorImpl createFunctionDescriptor(
JetFunctionLiteralExpression expression,
ExpressionTypingContext context,
boolean functionTypeExpected) {
JetFunctionLiteral functionLiteral = expression.getFunctionLiteral();
JetTypeReference receiverTypeRef = functionLiteral.getReceiverTypeRef();
NamedFunctionDescriptorImpl functionDescriptor =
new NamedFunctionDescriptorImpl(
context.scope.getContainingDeclaration(),
Collections.<AnnotationDescriptor>emptyList(),
"<anonymous>",
CallableMemberDescriptor.Kind.DECLARATION);
List<ValueParameterDescriptor> valueParameterDescriptors =
createValueParameterDescriptors(
context, functionLiteral, functionDescriptor, functionTypeExpected);
JetType effectiveReceiverType;
if (receiverTypeRef == null) {
if (functionTypeExpected) {
effectiveReceiverType = JetStandardClasses.getReceiverType(context.expectedType);
} else {
effectiveReceiverType = null;
}
} else {
effectiveReceiverType = context.getTypeResolver().resolveType(context.scope, receiverTypeRef);
}
functionDescriptor.initialize(
effectiveReceiverType,
NO_RECEIVER,
Collections.<TypeParameterDescriptor>emptyList(),
valueParameterDescriptors,
null,
Modality.FINAL,
Visibility.LOCAL);
context.trace.record(BindingContext.FUNCTION, expression, functionDescriptor);
return functionDescriptor;
}
@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);
}