org.jetbrains.kotlin.fir.analysis.checkers.declaration.FirInfixFunctionDeclarationChecker.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.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.FirClass
import org.jetbrains.kotlin.fir.declarations.FirMemberDeclaration
import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
import org.jetbrains.kotlin.fir.declarations.isInfix

object FirInfixFunctionDeclarationChecker : FirMemberDeclarationChecker() {
    override fun check(declaration: FirMemberDeclaration, context: CheckerContext, reporter: DiagnosticReporter) {
        if (declaration is FirSimpleFunction && declaration.isInfix) {
            if (declaration.valueParameters.size != 1 || !hasExtensionOrDispatchReceiver(declaration, context)) {
                reporter.report(declaration.source)
            }
            return
        }
        if (declaration.isInfix) {
            reporter.report(declaration.source)
        }
    }

    private fun hasExtensionOrDispatchReceiver(
        function: FirSimpleFunction,
        context: CheckerContext
    ): Boolean {
        if (function.receiverTypeRef != null) return true
        return context.containingDeclarations.lastOrNull() is FirClass<*>
    }

    private fun DiagnosticReporter.report(source: FirSourceElement?) {
        source?.let { report(FirErrors.INAPPLICABLE_INFIX_MODIFIER.on(it, "Inapplicable infix modifier")) }
    }
}