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/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.resolve
import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.DiagnosticFactory3
import org.jetbrains.kotlin.diagnostics.Errors.*
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.types.TypeUtils
import org.jetbrains.kotlin.types.isError
// Checker for all seven EXPOSED_* errors
// All functions return true if everything is OK, or false in case of any errors
class ExposedVisibilityChecker(private val trace: BindingTrace? = null) {
private fun reportExposure(
diagnostic: DiagnosticFactory3,
element: E,
elementVisibility: EffectiveVisibility,
restrictingDescriptor: DescriptorWithRelation
) {
trace?.report(diagnostic.on(element, elementVisibility, restrictingDescriptor, restrictingDescriptor.effectiveVisibility()))
}
// NB: does not check any members
fun checkClassHeader(klass: KtClassOrObject, classDescriptor: ClassDescriptor): Boolean {
var result = checkSupertypes(klass, classDescriptor)
result = result and checkParameterBounds(klass, classDescriptor)
val constructor = klass.primaryConstructor ?: return result
val constructorDescriptor = classDescriptor.unsubstitutedPrimaryConstructor ?: return result
return result and checkFunction(constructor, constructorDescriptor)
}
fun checkDeclarationWithVisibility(
modifierListOwner: KtModifierListOwner,
descriptor: DeclarationDescriptorWithVisibility,
visibility: DescriptorVisibility
): Boolean {
return when {
modifierListOwner is KtFunction &&
descriptor is FunctionDescriptor -> checkFunction(modifierListOwner, descriptor, visibility)
modifierListOwner is KtProperty &&
descriptor is PropertyDescriptor -> checkProperty(modifierListOwner, descriptor, visibility)
else -> true
}
}
fun checkTypeAlias(typeAlias: KtTypeAlias, typeAliasDescriptor: TypeAliasDescriptor) {
val expandedType = typeAliasDescriptor.expandedType
if (expandedType.isError) return
val typeAliasVisibility = typeAliasDescriptor.effectiveVisibility()
val restricting = expandedType.leastPermissiveDescriptor(typeAliasVisibility)
if (restricting != null) {
reportExposure(EXPOSED_TYPEALIAS_EXPANDED_TYPE, typeAlias.nameIdentifier ?: typeAlias, typeAliasVisibility, restricting)
}
}
fun checkFunction(
function: KtFunction,
functionDescriptor: FunctionDescriptor,
// for checking situation with modified basic visibility
visibility: DescriptorVisibility = functionDescriptor.visibility
): Boolean {
val functionVisibility = functionDescriptor.effectiveVisibility(visibility)
var result = true
if (function !is KtConstructor<*>) {
val restricting = functionDescriptor.returnType?.leastPermissiveDescriptor(functionVisibility)
if (restricting != null) {
reportExposure(EXPOSED_FUNCTION_RETURN_TYPE, function.nameIdentifier ?: function, functionVisibility, restricting)
result = false
}
}
functionDescriptor.valueParameters.forEachIndexed { i, parameterDescriptor ->
if (i < function.valueParameters.size) {
val valueParameter = function.valueParameters[i]
val restricting = parameterDescriptor.type.leastPermissiveDescriptor(functionVisibility)
if (restricting != null) {
reportExposure(EXPOSED_PARAMETER_TYPE, valueParameter, functionVisibility, restricting)
result = false
} else if (functionDescriptor is ClassConstructorDescriptor && valueParameter.hasValOrVar()) {
val propertyDescriptor = trace?.get(BindingContext.VALUE_PARAMETER_AS_PROPERTY, parameterDescriptor)
val propertyOrClassVisibility = (propertyDescriptor ?: functionDescriptor.constructedClass).effectiveVisibility()
val restrictingByProperty = parameterDescriptor.type.leastPermissiveDescriptor(propertyOrClassVisibility)
if (restrictingByProperty != null) {
reportExposure(
EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR, valueParameter, propertyOrClassVisibility, restrictingByProperty
)
result = false
}
}
}
}
return result and checkMemberReceiver(function.receiverTypeReference, functionDescriptor)
}
fun checkProperty(
property: KtProperty,
propertyDescriptor: PropertyDescriptor,
// for checking situation with modified basic visibility
visibility: DescriptorVisibility = propertyDescriptor.visibility
): Boolean {
val propertyVisibility = propertyDescriptor.effectiveVisibility(visibility)
val restricting = propertyDescriptor.type.leastPermissiveDescriptor(propertyVisibility)
var result = true
if (restricting != null) {
reportExposure(EXPOSED_PROPERTY_TYPE, property.nameIdentifier ?: property, propertyVisibility, restricting)
result = false
}
return result and checkMemberReceiver(property.receiverTypeReference, propertyDescriptor)
}
private fun checkMemberReceiver(typeReference: KtTypeReference?, memberDescriptor: CallableMemberDescriptor): Boolean {
if (typeReference == null) return true
val receiverParameterDescriptor = memberDescriptor.extensionReceiverParameter ?: return true
val memberVisibility = memberDescriptor.effectiveVisibility()
val restricting = receiverParameterDescriptor.type.leastPermissiveDescriptor(memberVisibility)
if (restricting != null) {
reportExposure(EXPOSED_RECEIVER_TYPE, typeReference, memberVisibility, restricting)
return false
}
return true
}
private fun checkSupertypes(klass: KtClassOrObject, classDescriptor: ClassDescriptor): Boolean {
val classVisibility = classDescriptor.effectiveVisibility()
val isInterface = classDescriptor.kind == ClassKind.INTERFACE
val delegationList = klass.superTypeListEntries
var result = true
classDescriptor.typeConstructor.supertypes.forEachIndexed { i, superType ->
if (i >= delegationList.size) return result
val superDescriptor = TypeUtils.getClassDescriptor(superType) ?: return@forEachIndexed
val superIsInterface = superDescriptor.kind == ClassKind.INTERFACE
if (superIsInterface != isInterface) {
return@forEachIndexed
}
val restricting = superType.leastPermissiveDescriptor(classVisibility)
if (restricting != null) {
reportExposure(
if (isInterface) EXPOSED_SUPER_INTERFACE else EXPOSED_SUPER_CLASS, delegationList[i], classVisibility, restricting
)
result = false
}
}
return result
}
private fun checkParameterBounds(klass: KtClassOrObject, classDescriptor: ClassDescriptor): Boolean {
val classVisibility = classDescriptor.effectiveVisibility()
val typeParameterList = klass.typeParameters
var result = true
classDescriptor.declaredTypeParameters.forEachIndexed { i, typeParameterDescriptor ->
if (i >= typeParameterList.size) return result
for (upperBound in typeParameterDescriptor.upperBounds) {
val restricting = upperBound.leastPermissiveDescriptor(classVisibility)
if (restricting != null) {
reportExposure(EXPOSED_TYPE_PARAMETER_BOUND, typeParameterList[i], classVisibility, restricting)
result = false
break
}
}
}
return result
}
}
