/*
* 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 org.jetbrains.kotlin.descriptors.TypeAliasDescriptor
import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
import org.jetbrains.kotlin.types.TypeConstructor
import org.jetbrains.kotlin.types.TypeProjection
class TypeAliasExpansion private constructor(
val parent: TypeAliasExpansion?,
val descriptor: TypeAliasDescriptor,
val arguments: List<TypeProjection>,
val mapping: Map<TypeParameterDescriptor, TypeProjection>
) {
fun getReplacement(constructor: TypeConstructor): TypeProjection? {
val descriptor = constructor.declarationDescriptor
return if (descriptor is TypeParameterDescriptor)
mapping[descriptor]
else
null
}
fun isRecursion(descriptor: TypeAliasDescriptor): Boolean =
this.descriptor == descriptor || (parent?.isRecursion(descriptor) ?: false)
companion object {
fun create(
parent: TypeAliasExpansion?,
typeAliasDescriptor: TypeAliasDescriptor,
arguments: List<TypeProjection>
): TypeAliasExpansion {
val typeParameters = typeAliasDescriptor.typeConstructor.parameters.map { it.original }
val mappedArguments = typeParameters.zip(arguments).toMap()
return TypeAliasExpansion(parent, typeAliasDescriptor, arguments, mappedArguments)
}
fun createWithFormalArguments(typeAliasDescriptor: TypeAliasDescriptor) =
create(null, typeAliasDescriptor, emptyList())
}
}