FIR IDE: introduce scopes for HL API

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

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.idea.frontend.api
 
 import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.diagnostics.Diagnostic
+import org.jetbrains.kotlin.idea.frontend.api.scopes.KtScopeProvider
 import org.jetbrains.kotlin.idea.frontend.api.symbols.*
 import org.jetbrains.kotlin.idea.frontend.api.types.KtType
 import org.jetbrains.kotlin.name.ClassId
@@ -18,6 +19,7 @@ abstract class KtAnalysisSession(project: Project) : ValidityOwner {
     override fun invalidationReason(): String = validityToken.invalidationReason()
 
     abstract val symbolProvider: KtSymbolProvider
+    abstract val scopeProvider: KtScopeProvider
 
     abstract fun getSmartCastedToTypes(expression: KtExpression): Collection<KtType>?
 

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/scopes/KtScope.kt

@@ -0,0 +1,41 @@
+/*
+ * 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.scopes
+
+import org.jetbrains.kotlin.idea.frontend.api.ValidityOwner
+import org.jetbrains.kotlin.idea.frontend.api.symbols.*
+import org.jetbrains.kotlin.name.Name
+
+interface KtScope : ValidityOwner {
+    fun getAllNames(): Set<Name>
+    fun getCallableNames(): Set<Name>
+    fun getClassLikeSymbolNames(): Set<Name>
+
+
+    fun getAllSymbols(): Sequence<KtSymbol>
+    fun getCallableSymbols(): Sequence<KtSymbol>
+    fun getClassClassLikeSymbols(): Sequence<KtClassLikeSymbol>
+
+    fun containsName(name: Name): Boolean
+}
+
+interface KtMemberScope : KtScope {
+    val owner: KtClassOrObjectSymbol
+}
+
+interface KtDeclaredMemberScope : KtScope {
+    val owner: KtClassOrObjectSymbol
+}
+
+interface KtPackageScope : KtScope, KtSubstitutedScope<KtPackageScope> {
+    val owner: KtPackageSymbol
+}
+
+interface KtUnsubstitutedScope<S : KtScope> : KtScope {
+    fun substitute(/*substitution*/): KtSubstitutedScope<S> = TODO()
+}
+
+interface KtSubstitutedScope<S> : KtScope

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/scopes/KtScopeProvider.kt

@@ -0,0 +1,16 @@
+/*
+ * 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.scopes
+
+import org.jetbrains.kotlin.idea.frontend.api.ValidityOwner
+import org.jetbrains.kotlin.idea.frontend.api.symbols.KtClassOrObjectSymbol
+import org.jetbrains.kotlin.idea.frontend.api.symbols.KtPackageSymbol
+
+abstract class KtScopeProvider : ValidityOwner {
+    abstract fun getMemberScope(classSymbol: KtClassOrObjectSymbol): KtMemberScope
+    abstract fun getDeclaredMemberScope(classSymbol: KtClassOrObjectSymbol): KtDeclaredMemberScope
+    abstract fun getPackageScope(packageSymbol: KtPackageSymbol): KtPackageScope
+}