org.jetbrains.kotlin.fir.resolve.transformers.ReturnTypeCalculator.kt Maven / Gradle / Ivy

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/*
 * 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.fir.resolve.transformers

import org.jetbrains.kotlin.fir.declarations.FirTypedDeclaration
import org.jetbrains.kotlin.fir.diagnostics.DiagnosticKind
import org.jetbrains.kotlin.fir.diagnostics.ConeSimpleDiagnostic
import org.jetbrains.kotlin.fir.render
import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
import org.jetbrains.kotlin.fir.types.builder.buildErrorTypeRef

interface ReturnTypeCalculator {
    fun tryCalculateReturnType(declaration: FirTypedDeclaration): FirResolvedTypeRef
}

class ReturnTypeCalculatorForFullBodyResolve : ReturnTypeCalculator {
    override fun tryCalculateReturnType(declaration: FirTypedDeclaration): FirResolvedTypeRef {
        val returnTypeRef = declaration.returnTypeRef
        if (returnTypeRef is FirResolvedTypeRef) return returnTypeRef

        return buildErrorTypeRef {
            diagnostic = ConeSimpleDiagnostic(
                "Cannot calculate return type during full-body resolution (local class/object?): ${declaration.render()}",
                DiagnosticKind.InferenceError
            )
        }
    }
}