@NotNull
private JetType modifyTypeAccordingToSuperMethods(
@NotNull JetType autoType,
@NotNull List<TypeAndVariance> typesFromSuper,
@NotNull TypeUsage howThisTypeIsUsed) {
if (ErrorUtils.isErrorType(autoType)) {
return autoType;
}
boolean resultNullable = typeMustBeNullable(autoType, typesFromSuper, howThisTypeIsUsed);
ClassifierDescriptor resultClassifier = modifyTypeClassifier(autoType, typesFromSuper);
List<TypeProjection> resultArguments =
getTypeArgsOfType(autoType, resultClassifier, typesFromSuper);
JetScope resultScope;
if (resultClassifier instanceof ClassDescriptor) {
resultScope = ((ClassDescriptor) resultClassifier).getMemberScope(resultArguments);
} else {
resultScope = autoType.getMemberScope();
}
JetTypeImpl type =
new JetTypeImpl(
autoType.getAnnotations(),
resultClassifier.getTypeConstructor(),
resultNullable,
resultArguments,
resultScope);
PropagationHeuristics.checkArrayInReturnType(this, type, typesFromSuper);
return type;
}
@Nullable
private JetType lookupNamespaceOrClassObject(
@NotNull JetSimpleNameExpression expression, @NotNull ResolutionContext context) {
Name referencedName = expression.getReferencedNameAsName();
final ClassifierDescriptor classifier = context.scope.getClassifier(referencedName);
if (classifier != null) {
JetType classObjectType = classifier.getClassObjectType();
if (classObjectType != null) {
context.trace.record(REFERENCE_TARGET, expression, classifier);
JetType result =
getExtendedClassObjectType(classObjectType, referencedName, classifier, context);
if (result == null) {
context.trace.report(NO_CLASS_OBJECT.on(expression, classifier));
}
return DataFlowUtils.checkType(result, expression, context);
}
}
JetType[] result = new JetType[1];
TemporaryBindingTrace temporaryTrace =
TemporaryBindingTrace.create(
context.trace, "trace for namespace/class object lookup of name", referencedName);
if (furtherNameLookup(expression, result, context.replaceBindingTrace(temporaryTrace))) {
temporaryTrace.commit();
return DataFlowUtils.checkType(result[0], expression, context);
}
// To report NO_CLASS_OBJECT when no namespace found
if (classifier != null) {
if (classifier instanceof TypeParameterDescriptor) {
if (context.expressionPosition == ExpressionPosition.FREE) {
context.trace.report(
TYPE_PARAMETER_IS_NOT_AN_EXPRESSION.on(
expression, (TypeParameterDescriptor) classifier));
} else {
context.trace.report(
TYPE_PARAMETER_ON_LHS_OF_DOT.on(expression, (TypeParameterDescriptor) classifier));
}
} else if (context.expressionPosition == ExpressionPosition.FREE) {
context.trace.report(NO_CLASS_OBJECT.on(expression, classifier));
}
context.trace.record(REFERENCE_TARGET, expression, classifier);
JetScope scopeForStaticMembersResolution =
classifier instanceof ClassDescriptor
? getStaticNestedClassesScope((ClassDescriptor) classifier)
: new JetScopeImpl() {
@NotNull
@Override
public DeclarationDescriptor getContainingDeclaration() {
return classifier;
}
@Override
public String toString() {
return "Scope for the type parameter on the left hand side of dot";
}
};
return new NamespaceType(referencedName, scopeForStaticMembersResolution);
}
temporaryTrace.commit();
return result[0];
}
@NotNull
private static Multimap<FqName, Pair<FunctionDescriptor, PsiMethod>>
getSuperclassToFunctionsMultimap(
@NotNull PsiMethodWrapper method,
@NotNull BindingContext bindingContext,
@NotNull ClassDescriptor containingClass) {
Multimap<FqName, Pair<FunctionDescriptor, PsiMethod>> result = HashMultimap.create();
Name functionName = Name.identifier(method.getName());
int parameterCount = method.getParameters().size();
for (JetType supertype : TypeUtils.getAllSupertypes(containingClass.getDefaultType())) {
ClassifierDescriptor klass = supertype.getConstructor().getDeclarationDescriptor();
assert klass != null;
FqName fqName = DescriptorUtils.getFQName(klass).toSafe();
for (FunctionDescriptor fun :
klass.getDefaultType().getMemberScope().getFunctions(functionName)) {
if (fun.getKind().isReal() && fun.getValueParameters().size() == parameterCount) {
PsiElement declaration = BindingContextUtils.descriptorToDeclaration(bindingContext, fun);
if (declaration instanceof PsiMethod) {
result.put(fqName, Pair.create(fun, (PsiMethod) declaration));
} // else declaration is null or JetNamedFunction: both cases are processed later
}
}
}
return result;
}
private String renderDefaultType(JetType type, boolean shortNamesOnly) {
StringBuilder sb = new StringBuilder();
ClassifierDescriptor cd = type.getConstructor().getDeclarationDescriptor();
Object typeNameObject;
if (cd == null || cd instanceof TypeParameterDescriptor) {
typeNameObject = type.getConstructor();
} else {
if (shortNamesOnly) {
// for nested classes qualified name should be used
typeNameObject = cd.getName();
DeclarationDescriptor parent = cd.getContainingDeclaration();
while (parent instanceof ClassDescriptor) {
typeNameObject = parent.getName() + "." + typeNameObject;
parent = parent.getContainingDeclaration();
}
} else {
typeNameObject = DescriptorUtils.getFQName(cd);
}
}
sb.append(typeNameObject);
if (!type.getArguments().isEmpty()) {
sb.append("<");
appendTypeProjections(sb, type.getArguments(), shortNamesOnly);
sb.append(">");
}
if (type.isNullable()) {
sb.append("?");
}
return sb.toString();
}
// Returns list with type arguments info from supertypes
// Example:
// - Foo<A, B> is a subtype of Bar<A, List<B>>, Baz<Boolean, A>
// - input: klass = Foo, typesFromSuper = [Bar<String, List<Int>>, Baz<Boolean, CharSequence>]
// - output[0] = [String, CharSequence], output[1] = []
private static List<List<TypeProjectionAndVariance>> calculateTypeArgumentsFromSuper(
@NotNull ClassDescriptor klass, @NotNull Collection<TypeAndVariance> typesFromSuper) {
// For each superclass of klass and its parameters, hold their mapping to klass' parameters
// #0 of Bar -> A
// #1 of Bar -> List<B>
// #0 of Baz -> Boolean
// #1 of Baz -> A
// #0 of Foo -> A (mapped to itself)
// #1 of Foo -> B (mapped to itself)
Multimap<TypeConstructor, TypeProjection> substitution =
SubstitutionUtils.buildDeepSubstitutionMultimap(
TypeUtils.makeUnsubstitutedType(klass, JetScope.EMPTY));
// for each parameter of klass, hold arguments in corresponding supertypes
List<List<TypeProjectionAndVariance>> parameterToArgumentsFromSuper = Lists.newArrayList();
for (TypeParameterDescriptor ignored : klass.getTypeConstructor().getParameters()) {
parameterToArgumentsFromSuper.add(new ArrayList<TypeProjectionAndVariance>());
}
// Enumerate all types from super and all its parameters
for (TypeAndVariance typeFromSuper : typesFromSuper) {
for (TypeParameterDescriptor parameter :
typeFromSuper.type.getConstructor().getParameters()) {
TypeProjection argument = typeFromSuper.type.getArguments().get(parameter.getIndex());
// for given example, this block is executed four times:
// 1. typeFromSuper = Bar<String, List<Int>>, parameter = "#0 of Bar", argument =
// String
// 2. typeFromSuper = Bar<String, List<Int>>, parameter = "#1 of Bar", argument =
// List<Int>
// 3. typeFromSuper = Baz<Boolean, CharSequence>, parameter = "#0 of Baz", argument =
// Boolean
// 4. typeFromSuper = Baz<Boolean, CharSequence>, parameter = "#1 of Baz", argument =
// CharSequence
// if it is mapped to klass' parameter, then store it into map
for (TypeProjection projection : substitution.get(parameter.getTypeConstructor())) {
// 1. projection = A
// 2. projection = List<B>
// 3. projection = Boolean
// 4. projection = A
ClassifierDescriptor classifier =
projection.getType().getConstructor().getDeclarationDescriptor();
// this condition is true for 1 and 4, false for 2 and 3
if (classifier instanceof TypeParameterDescriptor
&& classifier.getContainingDeclaration() == klass) {
int parameterIndex = ((TypeParameterDescriptor) classifier).getIndex();
Variance effectiveVariance =
parameter.getVariance().superpose(typeFromSuper.varianceOfPosition);
parameterToArgumentsFromSuper
.get(parameterIndex)
.add(new TypeProjectionAndVariance(argument, effectiveVariance));
}
}
}
}
return parameterToArgumentsFromSuper;
}
@Nullable
public static Name getNameIfStandardType(@NotNull JetType type) {
ClassifierDescriptor descriptor = type.getConstructor().getDeclarationDescriptor();
if (descriptor != null
&& descriptor.getContainingDeclaration()
== KotlinBuiltIns.getInstance().getBuiltInsPackageFragment()) {
return descriptor.getName();
}
return null;
}
@NotNull
private String renderTypeName(@NotNull TypeConstructor typeConstructor) {
ClassifierDescriptor cd = typeConstructor.getDeclarationDescriptor();
if (cd instanceof TypeParameterDescriptor) {
return renderName(cd.getName());
} else if (cd instanceof ClassDescriptor) {
return renderClassName((ClassDescriptor) cd);
} else {
assert cd == null : "Unexpected classifier: " + cd.getClass();
return typeConstructor.toString();
}
}
@Nullable
private JetType lookupNamespaceOrClassObject(
@NotNull JetSimpleNameExpression expression, @NotNull ResolutionContext context) {
Name referencedName = expression.getReferencedNameAsName();
ClassifierDescriptor classifier = context.scope.getClassifier(referencedName);
if (classifier != null) {
JetType classObjectType = classifier.getClassObjectType();
if (classObjectType != null) {
context.trace.record(REFERENCE_TARGET, expression, classifier);
JetType result;
if (context.expressionPosition == ExpressionPosition.LHS_OF_DOT
&& classifier instanceof ClassDescriptor) {
JetScope scope =
new ChainedScope(
classifier,
classObjectType.getMemberScope(),
getStaticNestedClassesScope((ClassDescriptor) classifier));
result = new NamespaceType(referencedName, scope);
} else if (context.expressionPosition == ExpressionPosition.LHS_OF_DOT
|| classifier.isClassObjectAValue()) {
result = classObjectType;
} else {
context.trace.report(NO_CLASS_OBJECT.on(expression, classifier));
result = null;
}
return DataFlowUtils.checkType(result, expression, context);
}
}
JetType[] result = new JetType[1];
TemporaryBindingTrace temporaryTrace =
TemporaryBindingTrace.create(
context.trace, "trace for namespace/class object lookup of name", referencedName);
if (furtherNameLookup(expression, result, context.replaceBindingTrace(temporaryTrace))) {
temporaryTrace.commit();
return DataFlowUtils.checkType(result[0], expression, context);
}
// To report NO_CLASS_OBJECT when no namespace found
if (classifier != null) {
if (context.expressionPosition == ExpressionPosition.FREE) {
context.trace.report(NO_CLASS_OBJECT.on(expression, classifier));
}
context.trace.record(REFERENCE_TARGET, expression, classifier);
JetScope scopeForStaticMembersResolution =
classifier instanceof ClassDescriptor
? getStaticNestedClassesScope((ClassDescriptor) classifier)
: JetScope.EMPTY;
return new NamespaceType(referencedName, scopeForStaticMembersResolution);
}
temporaryTrace.commit();
return result[0];
}
@Nullable
public static JetType getPrimitiveRangeElementType(JetType rangeType) {
ClassifierDescriptor declarationDescriptor =
rangeType.getConstructor().getDeclarationDescriptor();
assert declarationDescriptor != null;
if (declarationDescriptor
!= KotlinBuiltIns.getInstance()
.getBuiltInsScope()
.getClassifier(declarationDescriptor.getName())) {
// Must be a standard library class
return null;
}
return RANGE_TO_ELEMENT_TYPE.get(declarationDescriptor.getName().getName());
}
@Nullable
private JetType getExtendedClassObjectType(
@NotNull JetType classObjectType,
@NotNull Name referencedName,
@NotNull ClassifierDescriptor classifier,
@NotNull ResolutionContext context) {
if (context.expressionPosition == ExpressionPosition.LHS_OF_DOT
&& classifier instanceof ClassDescriptor) {
List<JetScope> scopes = new ArrayList<JetScope>(3);
scopes.add(classObjectType.getMemberScope());
scopes.add(getStaticNestedClassesScope((ClassDescriptor) classifier));
NamespaceDescriptor namespace = context.scope.getNamespace(referencedName);
if (namespace != null) {
scopes.add(namespace.getMemberScope());
}
JetScope scope = new ChainedScope(classifier, scopes.toArray(new JetScope[scopes.size()]));
return new NamespaceType(referencedName, scope);
} else if (context.expressionPosition == ExpressionPosition.LHS_OF_DOT
|| classifier.isClassObjectAValue()) {
return classObjectType;
} else {
return null;
}
}
@NotNull
private List<TypeProjection> getTypeArgsOfType(
@NotNull JetType autoType,
@NotNull ClassifierDescriptor classifier,
@NotNull List<TypeAndVariance> typesFromSuper) {
List<TypeProjection> autoArguments = autoType.getArguments();
if (!(classifier instanceof ClassDescriptor)) {
assert autoArguments.isEmpty()
: "Unexpected type arguments when type constructor is not ClassDescriptor, type = "
+ autoType;
return autoArguments;
}
List<List<TypeProjectionAndVariance>> typeArgumentsFromSuper =
calculateTypeArgumentsFromSuper((ClassDescriptor) classifier, typesFromSuper);
// Modify type arguments using info from typesFromSuper
List<TypeProjection> resultArguments = Lists.newArrayList();
for (TypeParameterDescriptor parameter : classifier.getTypeConstructor().getParameters()) {
TypeProjection argument = autoArguments.get(parameter.getIndex());
JetType argumentType = argument.getType();
List<TypeProjectionAndVariance> projectionsFromSuper =
typeArgumentsFromSuper.get(parameter.getIndex());
List<TypeAndVariance> argTypesFromSuper = getTypes(projectionsFromSuper);
JetType type =
modifyTypeAccordingToSuperMethods(argumentType, argTypesFromSuper, TYPE_ARGUMENT);
Variance projectionKind =
calculateArgumentProjectionKindFromSuper(argument, projectionsFromSuper);
resultArguments.add(new TypeProjection(projectionKind, type));
}
return resultArguments;
}
/**
* Remember that we are trying to cast something of type {@code supertype} to {@code subtype}.
*
* <p>Since at runtime we can only check the class (type constructor), the rest of the subtype
* should be known statically, from supertype. This method reconstructs all static information
* that can be obtained from supertype.
*
* <p>Example 1: supertype = Collection<String> subtype = List<...> result = List<String>, all
* arguments are inferred
*
* <p>Example 2: supertype = Any subtype = List<...> result = List<*>, some arguments were not
* inferred, replaced with '*'
*/
public static TypeReconstructionResult findStaticallyKnownSubtype(
@NotNull JetType supertype, @NotNull TypeConstructor subtypeConstructor) {
assert !supertype.isNullable() : "This method only makes sense for non-nullable types";
// Assume we are casting an expression of type Collection<Foo> to List<Bar>
// First, let's make List<T>, where T is a type variable
ClassifierDescriptor descriptor = subtypeConstructor.getDeclarationDescriptor();
assert descriptor != null : "Can't create default type for " + subtypeConstructor;
JetType subtypeWithVariables = descriptor.getDefaultType();
// Now, let's find a supertype of List<T> that is a Collection of something,
// in this case it will be Collection<T>
JetType supertypeWithVariables =
TypeCheckingProcedure.findCorrespondingSupertype(subtypeWithVariables, supertype);
final List<TypeParameterDescriptor> variables =
subtypeWithVariables.getConstructor().getParameters();
Map<TypeConstructor, TypeProjection> substitution;
if (supertypeWithVariables != null) {
// Now, let's try to unify Collection<T> and Collection<Foo> solution is a map from T to Foo
TypeUnifier.UnificationResult solution =
TypeUnifier.unify(
new TypeProjectionImpl(supertype),
new TypeProjectionImpl(supertypeWithVariables),
new Predicate<TypeConstructor>() {
@Override
public boolean apply(TypeConstructor typeConstructor) {
ClassifierDescriptor descriptor = typeConstructor.getDeclarationDescriptor();
return descriptor instanceof TypeParameterDescriptor
&& variables.contains(descriptor);
}
});
substitution = Maps.newHashMap(solution.getSubstitution());
} else {
// If there's no corresponding supertype, no variables are determined
// This may be OK, e.g. in case 'Any as List<*>'
substitution = Maps.newHashMapWithExpectedSize(variables.size());
}
// If some of the parameters are not determined by unification, it means that these parameters
// are lost,
// let's put stars instead, so that we can only cast to something like List<*>, e.g. (a: Any) as
// List<*>
boolean allArgumentsInferred = true;
for (TypeParameterDescriptor variable : variables) {
TypeProjection value = substitution.get(variable.getTypeConstructor());
if (value == null) {
substitution.put(
variable.getTypeConstructor(), SubstitutionUtils.makeStarProjection(variable));
allArgumentsInferred = false;
}
}
// At this point we have values for all type parameters of List
// Let's make a type by substituting them: List<T> -> List<Foo>
JetType substituted =
TypeSubstitutor.create(substitution).substitute(subtypeWithVariables, Variance.INVARIANT);
return new TypeReconstructionResult(substituted, allArgumentsInferred);
}