/**
* @return true if this is an FQ name of a fictitious class representing the function type, e.g.
* kotlin.Function1 (but NOT kotlin.reflect.KFunction1)
*/
public static boolean isNumberedFunctionClassFqName(@NotNull FqNameUnsafe fqName) {
List<Name> segments = fqName.pathSegments();
if (segments.size() != 2) return false;
if (!BUILT_INS_PACKAGE_NAME.equals(first(segments))) return false;
String shortName = last(segments).asString();
return BuiltInFictitiousFunctionClassFactory.parseClassName(
shortName, BUILT_INS_PACKAGE_FQ_NAME)
!= null;
}
@NotNull
public static List<TypeProjection> getParameterTypeProjectionsFromFunctionType(
@NotNull KotlinType type) {
assert isFunctionOrExtensionFunctionType(type);
List<TypeProjection> arguments = type.getArguments();
int first = isExtensionFunctionType(type) ? 1 : 0;
int last = arguments.size() - 2;
// TODO: fix bugs associated with this here and in neighboring methods, see KT-9820
assert first <= last + 1 : "Not an exact function type: " + type;
List<TypeProjection> parameterTypes = new ArrayList<TypeProjection>(last - first + 1);
for (int i = first; i <= last; i++) {
parameterTypes.add(arguments.get(i));
}
return parameterTypes;
}
@NotNull
public static List<TypeProjection> getFunctionTypeArgumentProjections(
@Nullable KotlinType receiverType,
@NotNull List<KotlinType> parameterTypes,
@NotNull KotlinType returnType) {
List<TypeProjection> arguments =
new ArrayList<TypeProjection>(parameterTypes.size() + (receiverType != null ? 1 : 0) + 1);
if (receiverType != null) {
arguments.add(defaultProjection(receiverType));
}
for (KotlinType parameterType : parameterTypes) {
arguments.add(defaultProjection(parameterType));
}
arguments.add(defaultProjection(returnType));
return arguments;
}
@NotNull
public static List<ValueParameterDescriptor> getValueParameters(
@NotNull FunctionDescriptor functionDescriptor, @NotNull KotlinType type) {
assert isFunctionOrExtensionFunctionType(type);
List<TypeProjection> parameterTypes = getParameterTypeProjectionsFromFunctionType(type);
List<ValueParameterDescriptor> valueParameters =
new ArrayList<ValueParameterDescriptor>(parameterTypes.size());
for (int i = 0; i < parameterTypes.size(); i++) {
TypeProjection parameterType = parameterTypes.get(i);
ValueParameterDescriptorImpl valueParameterDescriptor =
new ValueParameterDescriptorImpl(
functionDescriptor,
null,
i,
Annotations.Companion.getEMPTY(),
Name.identifier("p" + (i + 1)),
parameterType.getType(),
/* declaresDefaultValue = */ false,
/* isCrossinline = */ false,
/* isNoinline = */ false,
null,
SourceElement.NO_SOURCE);
valueParameters.add(valueParameterDescriptor);
}
return valueParameters;
}
@NotNull
public KotlinType getFunctionType(
@NotNull Annotations annotations,
@Nullable KotlinType receiverType,
@NotNull List<KotlinType> parameterTypes,
@NotNull KotlinType returnType) {
List<TypeProjection> arguments =
getFunctionTypeArgumentProjections(receiverType, parameterTypes, returnType);
int size = parameterTypes.size();
ClassDescriptor classDescriptor =
receiverType == null ? getFunction(size) : getExtensionFunction(size);
Annotations typeAnnotations =
receiverType == null ? annotations : addExtensionFunctionTypeAnnotation(annotations);
return KotlinTypeImpl.create(typeAnnotations, classDescriptor, false, arguments);
}
@NotNull
public static KotlinType getReturnTypeFromFunctionType(@NotNull KotlinType type) {
assert isFunctionOrExtensionFunctionType(type);
List<TypeProjection> arguments = type.getArguments();
return arguments.get(arguments.size() - 1).getType();
}