FIR IDE: separate KtExpressionTypeProvider into components

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/KtAnalysisSession.kt

@@ -36,7 +36,6 @@ import org.jetbrains.kotlin.psi.*
  */
 abstract class KtAnalysisSession(final override val token: ValidityToken) : ValidityTokenOwner {
     protected abstract val smartCastProvider: KtSmartCastProvider
-    protected abstract val typeProvider: KtTypeProvider
     protected abstract val diagnosticProvider: KtDiagnosticProvider
     protected abstract val scopeProvider: KtScopeProvider
     protected abstract val containingDeclarationProvider: KtSymbolContainingDeclarationProvider
@@ -45,7 +44,11 @@ abstract class KtAnalysisSession(final override val token: ValidityToken) : Vali
     protected abstract val completionCandidateChecker: KtCompletionCandidateChecker
     protected abstract val symbolDeclarationOverridesProvider: KtSymbolDeclarationOverridesProvider
     @Suppress("LeakingThis")
+
     protected open val typeRenderer: KtTypeRenderer = KtDefaultTypeRenderer(this, token)
+    protected abstract val expressionTypeProvider: KtExpressionTypeProvider
+    protected abstract val typeProvider: KtTypeProvider
+    protected abstract val subtypingComponent: KtSubtypingComponent
     protected abstract val expressionHandlingComponent: KtExpressionHandlingComponent
 
     /// TODO: get rid of
@@ -59,18 +62,20 @@ abstract class KtAnalysisSession(final override val token: ValidityToken) : Vali
 
     fun KtExpression.getImplicitReceiverSmartCasts(): Collection<ImplicitReceiverSmartCast> = smartCastProvider.getImplicitReceiverSmartCasts(this)
 
-    fun KtExpression.getKtType(): KtType = typeProvider.getKtExpressionType(this)
+    fun KtExpression.getKtType(): KtType = expressionTypeProvider.getKtExpressionType(this)
 
-    fun KtDeclaration.getReturnKtType(): KtType = typeProvider.getReturnTypeForKtDeclaration(this)
+    fun KtDeclaration.getReturnKtType(): KtType = expressionTypeProvider.getReturnTypeForKtDeclaration(this)
 
-    infix fun KtType.isEqualTo(other: KtType): Boolean = typeProvider.isEqualTo(this, other)
+    infix fun KtType.isEqualTo(other: KtType): Boolean = subtypingComponent.isEqualTo(this, other)
 
-    infix fun KtType.isSubTypeOf(superType: KtType): Boolean = typeProvider.isSubTypeOf(this, superType)
+    infix fun KtType.isSubTypeOf(superType: KtType): Boolean = subtypingComponent.isSubTypeOf(this, superType)
 
-    fun PsiElement.getExpectedType(): KtType? = typeProvider.getExpectedType(this)
+    fun PsiElement.getExpectedType(): KtType? = expressionTypeProvider.getExpectedType(this)
 
     fun KtType.isBuiltInFunctionalType(): Boolean = typeProvider.isBuiltinFunctionalType(this)
 
+    val builtinTypes: KtBuiltinTypes get() = typeProvider.builtinTypes
+
     fun KtElement.getDiagnostics(): Collection<Diagnostic> = diagnosticProvider.getDiagnosticsForElement(this)
 
     fun KtFile.collectDiagnosticsForFile(): Collection<Diagnostic> = diagnosticProvider.collectDiagnosticsForFile(this)

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/components/KtExpressionTypeProvider.kt

@@ -0,0 +1,19 @@
+/*
+ * 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.idea.frontend.api.components
+
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.idea.frontend.api.ValidityTokenOwner
+import org.jetbrains.kotlin.idea.frontend.api.types.KtType
+import org.jetbrains.kotlin.psi.KtDeclaration
+import org.jetbrains.kotlin.psi.KtExpression
+
+abstract class KtExpressionTypeProvider : KtAnalysisSessionComponent() {
+    abstract fun getReturnTypeForKtDeclaration(declaration: KtDeclaration): KtType
+    abstract fun getKtExpressionType(expression: KtExpression): KtType
+
+    abstract fun getExpectedType(expression: PsiElement): KtType?
+}

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/components/KtSubtypingComponent.kt

@@ -0,0 +1,13 @@
+/*
+ * 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.idea.frontend.api.components
+
+import org.jetbrains.kotlin.idea.frontend.api.types.KtType
+
+abstract class KtSubtypingComponent : KtAnalysisSessionComponent() {
+    abstract fun isEqualTo(first: KtType, second: KtType): Boolean
+    abstract fun isSubTypeOf(subType: KtType, superType: KtType): Boolean
+}

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/components/KtTypeProvider.kt

@@ -5,27 +5,17 @@
 
 package org.jetbrains.kotlin.idea.frontend.api.components
 
-import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.idea.frontend.api.ValidityTokenOwner
 import org.jetbrains.kotlin.idea.frontend.api.types.KtType
-import org.jetbrains.kotlin.psi.KtDeclaration
-import org.jetbrains.kotlin.psi.KtExpression
 
 abstract class KtTypeProvider : KtAnalysisSessionComponent() {
-    abstract fun getReturnTypeForKtDeclaration(declaration: KtDeclaration): KtType
+    //TODO get rid of it
-    abstract fun getKtExpressionType(expression: KtExpression): KtType
-
-    abstract fun isEqualTo(first: KtType, second: KtType): Boolean
-    abstract fun isSubTypeOf(subType: KtType, superType: KtType): Boolean
-
-    //TODO get rid of
     abstract fun isBuiltinFunctionalType(type: KtType): Boolean
 
-    abstract fun getExpectedType(expression: PsiElement): KtType?
-
     abstract val builtinTypes: KtBuiltinTypes
 }
 
+
 @Suppress("PropertyName")
 abstract class KtBuiltinTypes : ValidityTokenOwner {
     abstract val INT: KtType

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/KtFirAnalysisSession.kt

@@ -34,7 +34,7 @@ private constructor(
     }
 
     override val smartCastProvider: KtSmartCastProvider = KtFirSmartcastProvider(this, token)
-    override val typeProvider: KtTypeProvider = KtFirTypeProvider(this, token)
+    override val expressionTypeProvider: KtExpressionTypeProvider = KtFirExpressionTypeProvider(this, token)
     override val diagnosticProvider: KtDiagnosticProvider = KtFirDiagnosticProvider(this, token)
     override val containingDeclarationProvider = KtFirSymbolContainingDeclarationProvider(this, token)
     override val callResolver: KtCallResolver = KtFirCallResolver(this, token)
@@ -46,6 +46,8 @@ private constructor(
         KtFirSymbolDeclarationOverridesProvider(this, token)
 
     override val expressionHandlingComponent: KtExpressionHandlingComponent = KtFirExpressionHandlingComponent(this, token)
+    override val typeProvider: KtTypeProvider = KtFirTypeProvider(this, token)
+    override val subtypingComponent: KtSubtypingComponent = KtFirSubtypingComponent(this, token)
 
     override fun createContextDependentCopy(): KtAnalysisSession {
         check(!isContextSession) { "Cannot create context-dependent copy of KtAnalysis session from a context dependent one" }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/components/KtFirAnalysisSessionComponent.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.idea.frontend.api.fir.components
 
 import org.jetbrains.kotlin.fir.types.ConeKotlinType
+import org.jetbrains.kotlin.fir.types.ConeTypeCheckerContext
 import org.jetbrains.kotlin.idea.frontend.api.fir.KtFirAnalysisSession
 
 internal interface KtFirAnalysisSessionComponent {
@@ -14,4 +15,10 @@ internal interface KtFirAnalysisSessionComponent {
     val firSymbolBuilder get() = analysisSession.firSymbolBuilder
     val firResolveState get() = analysisSession.firResolveState
     fun ConeKotlinType.asKtType() = analysisSession.firSymbolBuilder.buildKtType(this)
+
+    fun createTypeCheckerContext() = ConeTypeCheckerContext(
+        isErrorTypeEqualsToAnything = true,
+        isStubTypeEqualsToAnything = true,
+        analysisSession.firResolveState.rootModuleSession //TODO use correct session here
+    )
 }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/components/KtFirExpressionTypeProvider.kt

@@ -0,0 +1,107 @@
+/*
+ * 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.idea.frontend.api.fir.components
+
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
+import org.jetbrains.kotlin.fir.expressions.FirExpression
+import org.jetbrains.kotlin.fir.expressions.FirFunctionCall
+import org.jetbrains.kotlin.fir.expressions.argumentMapping
+import org.jetbrains.kotlin.fir.psi
+import org.jetbrains.kotlin.fir.resolve.inference.isBuiltinFunctionalType
+import org.jetbrains.kotlin.fir.types.ConeTypeCheckerContext
+import org.jetbrains.kotlin.fir.types.coneType
+import org.jetbrains.kotlin.idea.fir.low.level.api.api.getOrBuildFirOfType
+import org.jetbrains.kotlin.idea.fir.low.level.api.api.getOrBuildFirSafe
+import org.jetbrains.kotlin.idea.frontend.api.ValidityToken
+import org.jetbrains.kotlin.idea.frontend.api.assertIsValid
+import org.jetbrains.kotlin.idea.frontend.api.components.KtBuiltinTypes
+import org.jetbrains.kotlin.idea.frontend.api.components.KtExpressionTypeProvider
+import org.jetbrains.kotlin.idea.frontend.api.fir.KtFirAnalysisSession
+import org.jetbrains.kotlin.idea.frontend.api.fir.types.KtFirType
+import org.jetbrains.kotlin.idea.frontend.api.types.KtType
+import org.jetbrains.kotlin.idea.frontend.api.withValidityAssertion
+import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.types.AbstractTypeChecker
+import org.jetbrains.kotlin.types.AbstractTypeCheckerContext
+
+internal class KtFirExpressionTypeProvider(
+    override val analysisSession: KtFirAnalysisSession,
+    override val token: ValidityToken,
+) : KtExpressionTypeProvider(), KtFirAnalysisSessionComponent {
+    override fun getReturnTypeForKtDeclaration(declaration: KtDeclaration): KtType = withValidityAssertion {
+        val firDeclaration = declaration.getOrBuildFirOfType<FirCallableDeclaration<*>>(firResolveState)
+        firDeclaration.returnTypeRef.coneType.asKtType()
+    }
+
+    override fun getKtExpressionType(expression: KtExpression): KtType = withValidityAssertion {
+        expression.getOrBuildFirOfType<FirExpression>(firResolveState).typeRef.coneType.asKtType()
+    }
+
+    override fun getExpectedType(expression: PsiElement): KtType? =
+        getExpectedTypeByReturnExpression(expression)
+            ?: getExpressionTypeByIfOrBooleanCondition(expression)
+            ?: getExpectedTypeOfFunctionParameter(expression)
+
+    private fun getExpectedTypeOfFunctionParameter(expression: PsiElement): KtType? {
+        val (ktCallExpression, ktArgument) = expression.getFunctionCallAsWithThisAsParameter() ?: return null
+        val firCall = ktCallExpression.getOrBuildFirSafe<FirFunctionCall>(firResolveState) ?: return null
+        val arguments = firCall.argumentMapping ?: return null
+        val firParameterForExpression = arguments.entries.firstOrNull { (arg, _) -> arg.psi == ktArgument }?.value ?: return null
+        return firParameterForExpression.returnTypeRef.coneType.asKtType()
+    }
+
+    private fun PsiElement.getFunctionCallAsWithThisAsParameter(): KtCallWithArgument? {
+        val valueArgument = unwrapQualified<KtValueArgument> { valueArg, expr -> valueArg.getArgumentExpression() == expr } ?: return null
+        val argumentsList = valueArgument.parent as? KtValueArgumentList ?: return null
+        val callExpression = argumentsList.parent as? KtCallExpression ?: return null
+        val argumentExpression = valueArgument.getArgumentExpression() ?: return null
+        return KtCallWithArgument(callExpression, argumentExpression)
+    }
+
+    private fun getExpectedTypeByReturnExpression(expression: PsiElement): KtType? {
+        val returnParent = expression.getReturnExpressionWithThisType() ?: return null
+        val targetSymbol = with(analysisSession) { returnParent.getReturnTargetSymbol() } ?: return null
+        return targetSymbol.type
+    }
+
+    private fun PsiElement.getReturnExpressionWithThisType(): KtReturnExpression? =
+        unwrapQualified { returnExpr, target -> returnExpr.returnedExpression == target }
+
+    private fun getExpressionTypeByIfOrBooleanCondition(expression: PsiElement): KtType? = when {
+        expression.isWhileLoopCondition() || expression.isIfCondition() -> with(analysisSession) { builtinTypes.BOOLEAN }
+        else -> null
+    }
+
+    private fun PsiElement.isWhileLoopCondition() =
+        unwrapQualified<KtWhileExpressionBase> { whileExpr, cond -> whileExpr.condition == cond } != null
+
+    private fun PsiElement.isIfCondition() =
+        unwrapQualified<KtIfExpression> { ifExpr, cond -> ifExpr.condition == cond } != null
+}
+
+private data class KtCallWithArgument(val call: KtCallExpression, val argument: KtExpression)
+
+private inline fun <reified R : Any> PsiElement.unwrapQualified(check: (R, PsiElement) -> Boolean): R? {
+    val parent = nonContainerParent
+    return when {
+        parent is R && check(parent, this) -> parent
+        parent is KtQualifiedExpression && parent.selectorExpression == this -> {
+            val grandParent = parent.nonContainerParent
+            when {
+                grandParent is R && check(grandParent, parent) -> grandParent
+                else -> null
+            }
+        }
+        else -> null
+    }
+}
+
+private val PsiElement.nonContainerParent: PsiElement?
+    get() = when (val parent = parent) {
+        is KtContainerNode -> parent.parent
+        else -> parent
+    }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/components/KtFirSubtyppingComponent.kt

@@ -0,0 +1,43 @@
+/*
+ * 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.idea.frontend.api.fir.components
+
+import org.jetbrains.kotlin.idea.frontend.api.ValidityToken
+import org.jetbrains.kotlin.idea.frontend.api.assertIsValid
+import org.jetbrains.kotlin.idea.frontend.api.components.KtSubtypingComponent
+import org.jetbrains.kotlin.idea.frontend.api.fir.KtFirAnalysisSession
+import org.jetbrains.kotlin.idea.frontend.api.fir.types.KtFirType
+import org.jetbrains.kotlin.idea.frontend.api.types.KtType
+import org.jetbrains.kotlin.idea.frontend.api.withValidityAssertion
+import org.jetbrains.kotlin.types.AbstractTypeChecker
+import org.jetbrains.kotlin.types.AbstractTypeCheckerContext
+
+internal class KtFirSubtypingComponent(
+    override val analysisSession: KtFirAnalysisSession,
+    override val token: ValidityToken,
+) : KtSubtypingComponent(), KtFirAnalysisSessionComponent {
+    override fun isEqualTo(first: KtType, second: KtType): Boolean = withValidityAssertion {
+        second.assertIsValid()
+        check(first is KtFirType)
+        check(second is KtFirType)
+        return AbstractTypeChecker.equalTypes(
+            createTypeCheckerContext() as AbstractTypeCheckerContext,
+            first.coneType,
+            second.coneType
+        )
+    }
+
+    override fun isSubTypeOf(subType: KtType, superType: KtType): Boolean = withValidityAssertion {
+        superType.assertIsValid()
+        check(subType is KtFirType)
+        check(superType is KtFirType)
+        return AbstractTypeChecker.isSubtypeOf(
+            createTypeCheckerContext() as AbstractTypeCheckerContext,
+            subType.coneType,
+            superType.coneType
+        )
+    }
+}

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/components/KtFirTypeProvider.kt

@@ -5,110 +5,19 @@
 
 package org.jetbrains.kotlin.idea.frontend.api.fir.components
 
-import com.intellij.psi.PsiElement
-import com.jetbrains.rd.util.firstOrNull
-import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
-import org.jetbrains.kotlin.fir.expressions.FirCall
-import org.jetbrains.kotlin.fir.expressions.FirExpression
-import org.jetbrains.kotlin.fir.expressions.FirFunctionCall
-import org.jetbrains.kotlin.fir.expressions.argumentMapping
-import org.jetbrains.kotlin.fir.psi
 import org.jetbrains.kotlin.fir.resolve.inference.isBuiltinFunctionalType
-import org.jetbrains.kotlin.fir.types.ConeTypeCheckerContext
-import org.jetbrains.kotlin.fir.types.coneType
-import org.jetbrains.kotlin.idea.fir.low.level.api.api.getOrBuildFir
-import org.jetbrains.kotlin.idea.fir.low.level.api.api.getOrBuildFirOfType
-import org.jetbrains.kotlin.idea.fir.low.level.api.api.getOrBuildFirSafe
 import org.jetbrains.kotlin.idea.frontend.api.ValidityToken
-import org.jetbrains.kotlin.idea.frontend.api.assertIsValid
 import org.jetbrains.kotlin.idea.frontend.api.components.KtBuiltinTypes
 import org.jetbrains.kotlin.idea.frontend.api.components.KtTypeProvider
 import org.jetbrains.kotlin.idea.frontend.api.fir.KtFirAnalysisSession
 import org.jetbrains.kotlin.idea.frontend.api.fir.types.KtFirType
 import org.jetbrains.kotlin.idea.frontend.api.types.KtType
 import org.jetbrains.kotlin.idea.frontend.api.withValidityAssertion
-import org.jetbrains.kotlin.psi.*
-import org.jetbrains.kotlin.types.AbstractTypeChecker
-import org.jetbrains.kotlin.types.AbstractTypeCheckerContext
-import org.jetbrains.kotlin.utils.addToStdlib.firstNotNullResult
-import kotlin.reflect.KClass
 
 internal class KtFirTypeProvider(
     override val analysisSession: KtFirAnalysisSession,
     override val token: ValidityToken,
 ) : KtTypeProvider(), KtFirAnalysisSessionComponent {
-    override fun getReturnTypeForKtDeclaration(declaration: KtDeclaration): KtType = withValidityAssertion {
-        val firDeclaration = declaration.getOrBuildFirOfType<FirCallableDeclaration<*>>(firResolveState)
-        firDeclaration.returnTypeRef.coneType.asKtType()
-    }
-
-    override fun getKtExpressionType(expression: KtExpression): KtType = withValidityAssertion {
-        expression.getOrBuildFirOfType<FirExpression>(firResolveState).typeRef.coneType.asKtType()
-    }
-
-    override fun getExpectedType(expression: PsiElement): KtType? =
-        getExpectedTypeByReturnExpression(expression)
-            ?: getExpressionTypeByIfOrBooleanCondition(expression)
-            ?: getExpectedTypeOfFunctionParameter(expression)
-
-    private fun getExpectedTypeOfFunctionParameter(expression: PsiElement): KtType? {
-        val (ktCallExpression, ktArgument) = expression.getFunctionCallAsWithThisAsParameter() ?: return null
-        val firCall = ktCallExpression.getOrBuildFirSafe<FirFunctionCall>(firResolveState) ?: return null
-        val arguments = firCall.argumentMapping ?: return null
-        val firParameterForExpression = arguments.entries.firstOrNull { (arg, _) -> arg.psi == ktArgument }?.value ?: return null
-        return firParameterForExpression.returnTypeRef.coneType.asKtType()
-    }
-
-    private fun PsiElement.getFunctionCallAsWithThisAsParameter(): KtCallWithArgument? {
-        val valueArgument = unwrapQualified<KtValueArgument> { valueArg, expr -> valueArg.getArgumentExpression() == expr } ?: return null
-        val argumentsList = valueArgument.parent as? KtValueArgumentList ?: return null
-        val callExpression = argumentsList.parent as? KtCallExpression ?: return null
-        val argumentExpression = valueArgument.getArgumentExpression() ?: return null
-        return KtCallWithArgument(callExpression, argumentExpression)
-    }
-
-    private fun getExpectedTypeByReturnExpression(expression: PsiElement): KtType? {
-        val returnParent = expression.getReturnExpressionWithThisType() ?: return null
-        val targetSymbol = with(analysisSession) { returnParent.getReturnTargetSymbol() } ?: return null
-        return targetSymbol.type
-    }
-
-    private fun PsiElement.getReturnExpressionWithThisType(): KtReturnExpression? =
-        unwrapQualified { returnExpr, target -> returnExpr.returnedExpression == target }
-
-    private fun getExpressionTypeByIfOrBooleanCondition(expression: PsiElement): KtType? = when {
-        expression.isWhileLoopCondition() || expression.isIfCondition() -> builtinTypes.BOOLEAN
-        else -> null
-    }
-
-    private fun PsiElement.isWhileLoopCondition() =
-        unwrapQualified<KtWhileExpressionBase> { whileExpr, cond -> whileExpr.condition == cond } != null
-
-    private fun PsiElement.isIfCondition() =
-        unwrapQualified<KtIfExpression> { ifExpr, cond -> ifExpr.condition == cond } != null
-
-    override fun isEqualTo(first: KtType, second: KtType): Boolean = withValidityAssertion {
-        second.assertIsValid()
-        check(first is KtFirType)
-        check(second is KtFirType)
-        return AbstractTypeChecker.equalTypes(
-            this.createTypeCheckerContext() as AbstractTypeCheckerContext,
-            first.coneType,
-            second.coneType
-        )
-    }
-
-    override fun isSubTypeOf(subType: KtType, superType: KtType): Boolean = withValidityAssertion {
-        superType.assertIsValid()
-        check(subType is KtFirType)
-        check(superType is KtFirType)
-        return AbstractTypeChecker.isSubtypeOf(
-            this.createTypeCheckerContext() as AbstractTypeCheckerContext,
-            subType.coneType,
-            superType.coneType
-        )
-    }
-
     override fun isBuiltinFunctionalType(type: KtType): Boolean = withValidityAssertion {
         check(type is KtFirType)
         type.coneType.isBuiltinFunctionalType(analysisSession.firResolveState.rootModuleSession) //TODO use correct session here
@@ -116,33 +25,4 @@ internal class KtFirTypeProvider(
 
     override val builtinTypes: KtBuiltinTypes =
         KtFirBuiltInTypes(analysisSession.firResolveState.rootModuleSession.builtinTypes, analysisSession.firSymbolBuilder, token)
-
-    private fun createTypeCheckerContext() = ConeTypeCheckerContext(
-        isErrorTypeEqualsToAnything = true,
-        isStubTypeEqualsToAnything = true,
-        analysisSession.firResolveState.rootModuleSession //TODO use correct session here
-    )
 }
-
-private data class KtCallWithArgument(val call: KtCallExpression, val argument: KtExpression)
-
-private inline fun <reified R : Any> PsiElement.unwrapQualified(check: (R, PsiElement) -> Boolean): R? {
-    val parent = nonContainerParent
-    return when {
-        parent is R && check(parent, this) -> parent
-        parent is KtQualifiedExpression && parent.selectorExpression == this -> {
-            val grandParent = parent.nonContainerParent
-            when {
-                grandParent is R && check(grandParent, parent) -> grandParent
-                else -> null
-            }
-        }
-        else -> null
-    }
-}
-
-private val PsiElement.nonContainerParent: PsiElement?
-    get() = when (val parent = parent) {
-        is KtContainerNode -> parent.parent
-        else -> parent
-    }