org.jetbrains.kotlin.fir.analysis.checkers.declaration.FirManyCompanionObjectsChecker.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.fir.analysis.checkers.declaration

import org.jetbrains.kotlin.descriptors.ClassKind
import org.jetbrains.kotlin.fir.FirSourceElement
import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
import org.jetbrains.kotlin.fir.analysis.diagnostics.DiagnosticReporter
import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
import org.jetbrains.kotlin.fir.declarations.FirDeclaration
import org.jetbrains.kotlin.fir.declarations.FirRegularClass
import org.jetbrains.kotlin.fir.declarations.isCompanion

object FirManyCompanionObjectsChecker : FirBasicDeclarationChecker() {
    override fun check(declaration: FirDeclaration, context: CheckerContext, reporter: DiagnosticReporter) {
        if (declaration !is FirRegularClass) {
            return
        }

        var hasCompanion = false

        for (it in declaration.declarations) {
            if (it is FirRegularClass && it.isCompanion) {
                if (hasCompanion) {
                    reporter.report(it.source)
                }
                hasCompanion = true
            }
        }
    }

    private fun DiagnosticReporter.report(source: FirSourceElement?) {
        source?.let { report(FirErrors.MANY_COMPANION_OBJECTS.on(it)) }
    }
}