org.jetbrains.kotlin.types.checker.utils.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2015 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.types.checker
import org.jetbrains.kotlin.resolve.calls.inference.wrapWithCapturingSubstitution
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.TypeConstructorSubstitution
import org.jetbrains.kotlin.types.TypeUtils
import org.jetbrains.kotlin.types.Variance
import org.jetbrains.kotlin.types.typesApproximation.approximateCapturedTypes
import java.util.*
private class SubtypePathNode(val type: KotlinType, val previous: SubtypePathNode?)
fun findCorrespondingSupertype(
subtype: KotlinType, supertype: KotlinType,
typeCheckingProcedureCallbacks: TypeCheckingProcedureCallbacks
): KotlinType? {
val queue = ArrayDeque()
queue.add(SubtypePathNode(subtype, null))
val supertypeConstructor = supertype.constructor
while (!queue.isEmpty()) {
val lastPathNode = queue.poll()
val currentSubtype = lastPathNode.type
val constructor = currentSubtype.constructor
if (typeCheckingProcedureCallbacks.assertEqualTypeConstructors(constructor, supertypeConstructor)) {
var substituted = currentSubtype
var isAnyMarkedNullable = currentSubtype.isMarkedNullable
var currentPathNode = lastPathNode.previous
while (currentPathNode != null) {
val currentType = currentPathNode.type
if (currentType.arguments.any { it.projectionKind != Variance.INVARIANT }) {
substituted = TypeConstructorSubstitution.create(currentType)
.wrapWithCapturingSubstitution().buildSubstitutor()
.safeSubstitute(substituted, Variance.INVARIANT)
.approximate()
}
else {
substituted = TypeConstructorSubstitution.create(currentType)
.buildSubstitutor()
.safeSubstitute(substituted, Variance.INVARIANT)
}
isAnyMarkedNullable = isAnyMarkedNullable || currentType.isMarkedNullable
currentPathNode = currentPathNode.previous
}
return TypeUtils.makeNullableAsSpecified(substituted, isAnyMarkedNullable)
}
for (immediateSupertype in constructor.supertypes) {
queue.add(SubtypePathNode(immediateSupertype, lastPathNode))
}
}
return null
}
private fun KotlinType.approximate() = approximateCapturedTypes(this).upper