kotlin.reflect.jvm.internal.impl.resolve.inlineClassesUtils.kt Maven / Gradle / Ivy

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/*
 * Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
 * that can be found in the license/LICENSE.txt file.
 */

package kotlin.reflect.jvm.internal.impl.resolve

import kotlin.reflect.jvm.internal.impl.descriptors.ClassDescriptor
import kotlin.reflect.jvm.internal.impl.descriptors.DeclarationDescriptor
import kotlin.reflect.jvm.internal.impl.descriptors.ValueParameterDescriptor
import kotlin.reflect.jvm.internal.impl.incremental.components.NoLookupLocation
import kotlin.reflect.jvm.internal.impl.types.KotlinType
import kotlin.reflect.jvm.internal.impl.types.TypeUtils
import kotlin.reflect.jvm.internal.impl.utils.addToStdlib.safeAs

fun ClassDescriptor.underlyingRepresentation(): ValueParameterDescriptor? {
    if (!isInline) return null
    return unsubstitutedPrimaryConstructor?.valueParameters?.singleOrNull()
}

fun DeclarationDescriptor.isInlineClass() = this is ClassDescriptor && this.isInline

fun KotlinType.unsubstitutedUnderlyingParameter(): ValueParameterDescriptor? {
    return constructor.declarationDescriptor.safeAs()?.underlyingRepresentation()
}

fun KotlinType.unsubstitutedUnderlyingType(): KotlinType? = unsubstitutedUnderlyingParameter()?.type

fun KotlinType.isInlineClassType(): Boolean = constructor.declarationDescriptor?.isInlineClass() ?: false

fun KotlinType.substitutedUnderlyingType(): KotlinType? {
    val parameter = unsubstitutedUnderlyingParameter() ?: return null
    return memberScope.getContributedVariables(parameter.name, NoLookupLocation.FOR_ALREADY_TRACKED).singleOrNull()?.type
}

fun KotlinType.isNullableUnderlyingType(): Boolean {
    if (!isInlineClassType()) return false
    val underlyingType = unsubstitutedUnderlyingType() ?: return false

    return TypeUtils.isNullableType(underlyingType)
}