org.jetbrains.kotlin.resolve.checkers.SealedInheritorInSamePackageChecker.kt Maven / Gradle / Ivy

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/*
 * 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.resolve.checkers

import org.jetbrains.kotlin.config.LanguageFeature
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.containingPackage
import org.jetbrains.kotlin.descriptors.isSealed
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.psi.KtClassOrObject
import org.jetbrains.kotlin.psi.KtDeclaration
import org.jetbrains.kotlin.resolve.bindingContextUtil.getAbbreviatedTypeOrType

object SealedInheritorInSamePackageChecker : DeclarationChecker {
    override fun check(declaration: KtDeclaration, descriptor: DeclarationDescriptor, context: DeclarationCheckerContext) {
        if (!context.languageVersionSettings.supportsFeature(LanguageFeature.AllowSealedInheritorsInDifferentFilesOfSamePackage)) return
        if (descriptor !is ClassDescriptor || declaration !is KtClassOrObject) return
        val classPackage = descriptor.containingPackage() ?: return // local class, SEALED_SUPERTYPE already reported
        for (superTypeListEntry in declaration.superTypeListEntries) {
            val typeReference = superTypeListEntry.typeReference ?: continue
            val superType = typeReference.getAbbreviatedTypeOrType(context.trace.bindingContext)?.unwrap() ?: continue
            val superClass = superType.constructor.declarationDescriptor ?: continue
            if (!superClass.isSealed()) continue
            val superClassPackage = superClass.containingPackage() ?: continue
            if (classPackage != superClassPackage) {
                context.trace.report(Errors.SEALED_INHERITOR_IN_DIFFERENT_PACKAGE.on(typeReference, classPackage, superClassPackage))
            }
        }
    }
}