[Analysis API] introduce base KtTypeScope -> KtScope converter

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/KtAnalysisSession.kt

@@ -58,7 +58,8 @@ public abstract class KtAnalysisSession(final override val token: KtLifetimeToke
     KtInheritorsProviderMixIn,
     KtTypeCreatorMixIn,
     KtAnalysisScopeProviderMixIn,
-    KtSignatureSubsitutorMixIn {
+    KtSignatureSubsitutorMixIn,
+    KtScopeSubstitutionMixIn {
 
     public abstract val useSiteModule: KtModule
 
@@ -147,6 +148,9 @@ public abstract class KtAnalysisSession(final override val token: KtLifetimeToke
     internal val substitutionProvider: KtSignatureSubsitutor get() = substitutionProviderImpl
     protected abstract val substitutionProviderImpl: KtSignatureSubsitutor
 
+    internal val scopeSubstitution: KtScopeSubstitution get() = scopeSubstitutionImpl
+    protected abstract val scopeSubstitutionImpl: KtScopeSubstitution
+
     @PublishedApi
     internal val typesCreator: KtTypeCreator
         get() = typesCreatorImpl

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/components/KtScopeSubstitution.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.analysis.api.components
+
+import org.jetbrains.kotlin.analysis.api.lifetime.withValidityAssertion
+import org.jetbrains.kotlin.analysis.api.scopes.KtScope
+import org.jetbrains.kotlin.analysis.api.scopes.KtTypeScope
+
+public abstract class KtScopeSubstitution : KtAnalysisSessionComponent() {
+    public abstract fun getDeclarationScope(scope: KtTypeScope): KtScope
+}
+
+public interface KtScopeSubstitutionMixIn : KtAnalysisSessionMixIn {
+    public fun KtTypeScope.getDeclarationScope(): KtScope =
+        withValidityAssertion { analysisSession.scopeSubstitution.getDeclarationScope(this) }
+}