org.jetbrains.kotlin.fir.expressions.ExhaustivenessStatus.kt Maven / Gradle / Ivy
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/*
* Copyright 2010-2021 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.expressions
import org.jetbrains.kotlin.diagnostics.WhenMissingCase
sealed class ExhaustivenessStatus {
/**
* This value is used if the subject has type other than `Nothing`, in which case it's literally exhaustive only if type's possible
* cases are properly covered.
*/
object ProperlyExhaustive : ExhaustivenessStatus()
/**
* This value is used if the subject has type `Nothing`, in which case even an empty `when` is considered exhaustive. Also, in this
* case, a synthetic else branch is created.
*/
object ExhaustiveAsNothing : ExhaustivenessStatus()
class NotExhaustive(val reasons: List) : ExhaustivenessStatus() {
companion object {
val NO_ELSE_BRANCH: NotExhaustive = NotExhaustive(listOf(WhenMissingCase.Unknown))
}
}
}
val FirWhenExpression.isExhaustive: Boolean
get() = exhaustivenessStatus == ExhaustivenessStatus.ProperlyExhaustive || exhaustivenessStatus == ExhaustivenessStatus.ExhaustiveAsNothing
val FirWhenExpression.isProperlyExhaustive: Boolean
get() = exhaustivenessStatus == ExhaustivenessStatus.ProperlyExhaustive