@NotNull
public KotlinType getArrayElementType(@NotNull KotlinType arrayType) {
if (isArray(arrayType)) {
if (arrayType.getArguments().size() != 1) {
throw new IllegalStateException();
}
return arrayType.getArguments().get(0).getType();
}
KotlinType primitiveType =
kotlinArrayTypeToPrimitiveKotlinType.get(TypeUtils.makeNotNullable(arrayType));
if (primitiveType == null) {
throw new IllegalStateException("not array: " + arrayType);
}
return primitiveType;
}
@Nullable
public static KotlinType getReceiverType(@NotNull KotlinType type) {
assert isFunctionOrExtensionFunctionType(type) : type;
if (isExtensionFunctionType(type)) {
// TODO: this is incorrect when a class extends from an extension function and swaps type
// arguments
return type.getArguments().get(0).getType();
}
return null;
}
public static boolean dependsOnTypeConstructors(
@NotNull KotlinType type, @NotNull Collection<TypeConstructor> typeParameterConstructors) {
if (typeParameterConstructors.contains(type.getConstructor())) return true;
for (TypeProjection typeProjection : type.getArguments()) {
if (!typeProjection.isStarProjection()
&& dependsOnTypeConstructors(typeProjection.getType(), typeParameterConstructors)) {
return true;
}
}
return false;
}
@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;
}
public static boolean contains(
@Nullable KotlinType type, @NotNull Function1<KotlinType, Boolean> isSpecialType) {
if (type == null) return false;
if (isSpecialType.invoke(type)) return true;
Flexibility flexibility = type.getCapability(Flexibility.class);
if (flexibility != null
&& (contains(flexibility.getLowerBound(), isSpecialType)
|| contains(flexibility.getUpperBound(), isSpecialType))) {
return true;
}
for (TypeProjection projection : type.getArguments()) {
if (!projection.isStarProjection() && contains(projection.getType(), isSpecialType))
return true;
}
return false;
}
@NotNull
public static KotlinType getReturnTypeFromFunctionType(@NotNull KotlinType type) {
assert isFunctionOrExtensionFunctionType(type);
List<TypeProjection> arguments = type.getArguments();
return arguments.get(arguments.size() - 1).getType();
}
@Override
@NotNull
public List<TypeProjection> getArguments() {
return delegate.getArguments();
}
public static boolean canHaveSubtypes(KotlinTypeChecker typeChecker, @NotNull KotlinType type) {
if (type.isMarkedNullable()) {
return true;
}
if (!type.getConstructor().isFinal()) {
return true;
}
List<TypeParameterDescriptor> parameters = type.getConstructor().getParameters();
List<TypeProjection> arguments = type.getArguments();
for (int i = 0, parametersSize = parameters.size(); i < parametersSize; i++) {
TypeParameterDescriptor parameterDescriptor = parameters.get(i);
TypeProjection typeProjection = arguments.get(i);
if (typeProjection.isStarProjection()) return true;
Variance projectionKind = typeProjection.getProjectionKind();
KotlinType argument = typeProjection.getType();
switch (parameterDescriptor.getVariance()) {
case INVARIANT:
switch (projectionKind) {
case INVARIANT:
if (lowerThanBound(typeChecker, argument, parameterDescriptor)
|| canHaveSubtypes(typeChecker, argument)) {
return true;
}
break;
case IN_VARIANCE:
if (lowerThanBound(typeChecker, argument, parameterDescriptor)) {
return true;
}
break;
case OUT_VARIANCE:
if (canHaveSubtypes(typeChecker, argument)) {
return true;
}
break;
}
break;
case IN_VARIANCE:
if (projectionKind != Variance.OUT_VARIANCE) {
if (lowerThanBound(typeChecker, argument, parameterDescriptor)) {
return true;
}
} else {
if (canHaveSubtypes(typeChecker, argument)) {
return true;
}
}
break;
case OUT_VARIANCE:
if (projectionKind != Variance.IN_VARIANCE) {
if (canHaveSubtypes(typeChecker, argument)) {
return true;
}
} else {
if (lowerThanBound(typeChecker, argument, parameterDescriptor)) {
return true;
}
}
break;
}
}
return false;
}