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org.jetbrains.kotlin.descriptors.EffectiveVisibility.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.descriptors
import org.jetbrains.kotlin.descriptors.EffectiveVisibility.Permissiveness
import org.jetbrains.kotlin.types.AbstractTypeChecker
import org.jetbrains.kotlin.types.AbstractTypeCheckerContext
import org.jetbrains.kotlin.types.model.TypeConstructorMarker
sealed class EffectiveVisibility(val name: String, val publicApi: Boolean = false, val privateApi: Boolean = false) {
override fun toString() = name
// Public
// /--/ | \-------------\
// Protected(Base) | \
// | Protected(Other) Internal = PackagePrivate
// Protected(Derived) | / \
// | | / InternalProtected(Base)
// ProtectedBound / \
// \ / /InternalProtected(Derived)
// \InternalProtectedBound/
// |
// Private = Local
object Private : EffectiveVisibility("private", privateApi = true) {
override fun relation(other: EffectiveVisibility): Permissiveness =
if (this == other || Local == other) Permissiveness.SAME else Permissiveness.LESS
override fun toVisibility(): Visibility = Visibilities.Private
}
// Effectively same as Private
object Local : EffectiveVisibility("local") {
override fun relation(other: EffectiveVisibility): Permissiveness =
if (this == other || Private == other) Permissiveness.SAME else Permissiveness.LESS
override fun toVisibility(): Visibility = Visibilities.Local
}
object Public : EffectiveVisibility("public", publicApi = true) {
override fun relation(other: EffectiveVisibility): Permissiveness =
if (this == other) Permissiveness.SAME else Permissiveness.MORE
override fun toVisibility(): Visibility = Visibilities.Public
}
abstract class InternalOrPackage protected constructor(internal: Boolean) : EffectiveVisibility(
if (internal) "internal" else "public/*package*/"
) {
override fun relation(other: EffectiveVisibility): Permissiveness = when (other) {
Public -> Permissiveness.LESS
Private, Local, InternalProtectedBound, is InternalProtected -> Permissiveness.MORE
is InternalOrPackage -> Permissiveness.SAME
ProtectedBound, is Protected -> Permissiveness.UNKNOWN
}
override fun lowerBound(other: EffectiveVisibility) = when (other) {
Public -> this
Private, Local, InternalProtectedBound, is InternalOrPackage, is InternalProtected -> other
is Protected -> InternalProtected(other.containerTypeConstructor, other.typeContext)
ProtectedBound -> InternalProtectedBound
}
}
object Internal : InternalOrPackage(true) {
override fun toVisibility(): Visibility = Visibilities.Internal
}
object PackagePrivate : InternalOrPackage(false) {
override fun toVisibility(): Visibility = Visibilities.Private
}
class Protected(
val containerTypeConstructor: TypeConstructorMarker?,
val typeContext: AbstractTypeCheckerContext
) : EffectiveVisibility("protected", publicApi = true) {
override fun equals(other: Any?) = (other is Protected && containerTypeConstructor == other.containerTypeConstructor)
override fun hashCode() = containerTypeConstructor?.hashCode() ?: 0
override fun toString() = "${super.toString()} (in ${containerTypeConstructor ?: '?'})"
override fun relation(other: EffectiveVisibility): Permissiveness = when (other) {
Public -> Permissiveness.LESS
Private, Local, ProtectedBound, InternalProtectedBound -> Permissiveness.MORE
is Protected -> containerRelation(containerTypeConstructor, other.containerTypeConstructor, typeContext)
is InternalProtected -> when (containerRelation(containerTypeConstructor, other.containerTypeConstructor, typeContext)) {
// Protected never can be less permissive than internal & protected
Permissiveness.SAME, Permissiveness.MORE -> Permissiveness.MORE
Permissiveness.UNKNOWN, Permissiveness.LESS -> Permissiveness.UNKNOWN
}
is InternalOrPackage -> Permissiveness.UNKNOWN
}
override fun lowerBound(other: EffectiveVisibility) = when (other) {
Public -> this
Private, Local, ProtectedBound, InternalProtectedBound -> other
is Protected -> when (relation(other)) {
Permissiveness.SAME, Permissiveness.MORE -> this
Permissiveness.LESS -> other
Permissiveness.UNKNOWN -> ProtectedBound
}
is InternalProtected -> when (relation(other)) {
Permissiveness.LESS -> other
else -> InternalProtectedBound
}
is InternalOrPackage -> InternalProtected(containerTypeConstructor, typeContext)
}
override fun toVisibility(): Visibility = Visibilities.Protected
}
// Lower bound for all protected visibilities
object ProtectedBound : EffectiveVisibility("protected (in different classes)", publicApi = true) {
override fun relation(other: EffectiveVisibility): Permissiveness = when (other) {
Public, is Protected -> Permissiveness.LESS
Private, Local, InternalProtectedBound -> Permissiveness.MORE
ProtectedBound -> Permissiveness.SAME
is InternalOrPackage, is InternalProtected -> Permissiveness.UNKNOWN
}
override fun lowerBound(other: EffectiveVisibility) = when (other) {
Public, is Protected -> this
Private, Local, ProtectedBound, InternalProtectedBound -> other
is InternalOrPackage, is InternalProtected -> InternalProtectedBound
}
override fun toVisibility(): Visibility = Visibilities.Protected
}
// Lower bound for internal and protected(C)
class InternalProtected(
val containerTypeConstructor: TypeConstructorMarker?,
val typeContext: AbstractTypeCheckerContext,
) : EffectiveVisibility("internal & protected") {
override fun equals(other: Any?) = (other is InternalProtected && containerTypeConstructor == other.containerTypeConstructor)
override fun hashCode() = containerTypeConstructor?.hashCode() ?: 0
override fun toString() = "${super.toString()} (in ${containerTypeConstructor ?: '?'})"
override fun relation(other: EffectiveVisibility): Permissiveness = when (other) {
Public, is InternalOrPackage -> Permissiveness.LESS
Private, Local, InternalProtectedBound -> Permissiveness.MORE
is InternalProtected -> containerRelation(containerTypeConstructor, other.containerTypeConstructor, typeContext)
is Protected -> when (containerRelation(containerTypeConstructor, other.containerTypeConstructor, typeContext)) {
// Internal & protected never can be more permissive than just protected
Permissiveness.SAME, Permissiveness.LESS -> Permissiveness.LESS
Permissiveness.UNKNOWN, Permissiveness.MORE -> Permissiveness.UNKNOWN
}
ProtectedBound -> Permissiveness.UNKNOWN
}
override fun lowerBound(other: EffectiveVisibility) = when (other) {
Public, is InternalOrPackage -> this
Private, Local, InternalProtectedBound -> other
is Protected, is InternalProtected -> when (relation(other)) {
Permissiveness.SAME, Permissiveness.MORE -> this
Permissiveness.LESS -> other
Permissiveness.UNKNOWN -> InternalProtectedBound
}
ProtectedBound -> InternalProtectedBound
}
override fun toVisibility(): Visibility = Visibilities.Private
}
// Lower bound for internal and protected lower bound
object InternalProtectedBound : EffectiveVisibility("internal & protected (in different classes)") {
override fun relation(other: EffectiveVisibility): Permissiveness = when (other) {
Public, is Protected, is InternalProtected, ProtectedBound, is InternalOrPackage -> Permissiveness.LESS
Private, Local -> Permissiveness.MORE
InternalProtectedBound -> Permissiveness.SAME
}
override fun toVisibility(): Visibility = Visibilities.Private
}
enum class Permissiveness {
LESS,
SAME,
MORE,
UNKNOWN
}
abstract fun relation(other: EffectiveVisibility): Permissiveness
abstract fun toVisibility(): Visibility
open fun lowerBound(other: EffectiveVisibility) = when (relation(other)) {
Permissiveness.SAME, Permissiveness.LESS -> this
Permissiveness.MORE -> other
Permissiveness.UNKNOWN -> Private
}
}
enum class RelationToType(val description: String) {
CONSTRUCTOR(""),
CONTAINER(" containing declaration"),
ARGUMENT(" argument"),
ARGUMENT_CONTAINER(" argument containing declaration");
fun containerRelation() = when (this) {
CONSTRUCTOR, CONTAINER -> CONTAINER
ARGUMENT, ARGUMENT_CONTAINER -> ARGUMENT_CONTAINER
}
override fun toString() = description
}
internal fun containerRelation(
first: TypeConstructorMarker?,
second: TypeConstructorMarker?,
typeContext: AbstractTypeCheckerContext
): Permissiveness {
return when {
first == null || second == null -> Permissiveness.UNKNOWN
first == second -> Permissiveness.SAME
AbstractTypeChecker.isSubtypeOfClass(typeContext, first, second) -> Permissiveness.LESS
AbstractTypeChecker.isSubtypeOfClass(typeContext, second, first) -> Permissiveness.MORE
else -> Permissiveness.UNKNOWN
}
}
