org.jetbrains.kotlin.types.TypeAliasExpansion.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2019 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.descriptors.TypeAliasDescriptor
import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
class TypeAliasExpansion private constructor(
val parent: TypeAliasExpansion?,
val descriptor: TypeAliasDescriptor,
val arguments: List,
val mapping: Map
) {
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
): 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())
}
}