org.jetbrains.kotlin.types.expandedTypeUtils.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.types
import org.jetbrains.kotlin.types.model.KotlinTypeMarker
import org.jetbrains.kotlin.types.model.SimpleTypeMarker
import org.jetbrains.kotlin.types.model.TypeConstructorMarker
fun TypeSystemCommonBackendContext.computeExpandedTypeForInlineClass(inlineClassType: KotlinTypeMarker): KotlinTypeMarker? =
computeExpandedTypeInner(inlineClassType, hashSetOf())
private fun TypeSystemCommonBackendContext.computeExpandedTypeInner(
kotlinType: KotlinTypeMarker, visitedClassifiers: HashSet
): KotlinTypeMarker? {
val classifier = kotlinType.typeConstructor()
if (!visitedClassifiers.add(classifier)) return null
val typeParameter = classifier.getTypeParameterClassifier()
return when {
typeParameter != null ->
computeExpandedTypeInner(typeParameter.getRepresentativeUpperBound(), visitedClassifiers)
?.let { expandedUpperBound ->
if (expandedUpperBound.isNullableType() || !kotlinType.isMarkedNullable())
expandedUpperBound
else
expandedUpperBound.makeNullable()
}
classifier.isInlineClass() -> {
// kotlinType is the boxed inline class type
val underlyingType = kotlinType.getSubstitutedUnderlyingType() ?: return null
val expandedUnderlyingType = computeExpandedTypeInner(underlyingType, visitedClassifiers) ?: return null
when {
!kotlinType.isNullableType() -> expandedUnderlyingType
// Here inline class type is nullable. Apply nullability to the expandedUnderlyingType.
// Nullable types become inline class boxes
expandedUnderlyingType.isNullableType() -> kotlinType
// Primitives become inline class boxes
expandedUnderlyingType is SimpleTypeMarker && expandedUnderlyingType.isPrimitiveType() -> kotlinType
// Non-null reference types become nullable reference types
else -> expandedUnderlyingType.makeNullable()
}
}
else -> kotlinType
}
}