FIR IDE: introduce symbol modality

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/KtClassLikeSymbol.kt

@@ -16,10 +16,10 @@ abstract class KtTypeAliasSymbol : KtClassLikeSymbol() {
     final override val symbolKind: KtSymbolKind get() = KtSymbolKind.TOP_LEVEL
 }
 
-abstract class KtClassOrObjectSymbol : KtClassLikeSymbol(), KtSymbolWithTypeParameters {
+abstract class KtClassOrObjectSymbol : KtClassLikeSymbol(), KtSymbolWithTypeParameters, KtSymbolWithModality<KtSymbolModality> {
     abstract val classKind: KtClassKind
 }
 
 enum class KtClassKind {
-    CLASS, ABSTRACT_CLASS, ENUM_CLASS, ENUM_ENTRY, ANNOTATION_CLASS, OBJECT, COMPANION_OBJECT, INTERFACE
+    CLASS, ENUM_CLASS, ENUM_ENTRY, ANNOTATION_CLASS, OBJECT, COMPANION_OBJECT, INTERFACE
 }

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/KtFunctionLikeSymbol.kt

@@ -15,7 +15,12 @@ abstract class KtAnonymousFunctionSymbol : KtFunctionLikeSymbol() {
     final override val symbolKind: KtSymbolKind get() = KtSymbolKind.LOCAL
 }
 
-abstract class KtFunctionSymbol : KtFunctionLikeSymbol(), KtNamedSymbol, KtPossibleExtensionSymbol, KtSymbolWithTypeParameters {
+abstract class KtFunctionSymbol : KtFunctionLikeSymbol(),
+    KtNamedSymbol,
+    KtPossibleExtensionSymbol,
+    KtSymbolWithTypeParameters,
+    KtSymbolWithModality<KtCommonSymbolModality> {
+
     abstract val isSuspend: Boolean
     abstract val isOperator: Boolean
     abstract val fqName: FqName?

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/KtSymbolProvider.kt

@@ -7,6 +7,8 @@ package org.jetbrains.kotlin.idea.frontend.api.symbols
 
 import org.jetbrains.kotlin.idea.frontend.api.ValidityOwner
 import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.*
 
 abstract class KtSymbolProvider : ValidityOwner {
@@ -38,4 +40,6 @@ abstract class KtSymbolProvider : ValidityOwner {
      * @return symbol with specified [classId] or `null` in case such symbol is not found
      */
     abstract fun getClassOrObjectSymbolByClassId(classId: ClassId): KtClassOrObjectSymbol?
+
+    abstract fun getTopLevelCallableSymbols(packageFqName: FqName, name: Name): Sequence<KtSymbol>
 }

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/KtVariableLikeSymbol.kt

@@ -19,12 +19,12 @@ abstract class KtVariableSymbol : KtVariableLikeSymbol() {
     abstract val isVal: Boolean
 }
 
-abstract class KtFieldSymbol : KtVariableSymbol() {
+abstract class KtFieldSymbol : KtVariableSymbol(), KtSymbolWithModality<KtCommonSymbolModality> {
     final override val symbolKind: KtSymbolKind get() = KtSymbolKind.MEMBER
 }
 
 // TODO getters & setters
-abstract class KtPropertySymbol : KtVariableSymbol(), KtPossibleExtensionSymbol {
+abstract class KtPropertySymbol : KtVariableSymbol(), KtPossibleExtensionSymbol, KtSymbolWithModality<KtCommonSymbolModality> {
     abstract val fqName: FqName
 }
 

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/symbols/markers.kt

@@ -32,3 +32,17 @@ interface KtPossibleExtensionSymbol {
 interface KtSymbolWithTypeParameters {
     val typeParameters: List<KtTypeParameterSymbol>
 }
+
+interface KtSymbolWithModality<M : KtSymbolModality> {
+    val modality: M
+}
+
+sealed class KtSymbolModality {
+    object SEALED : KtSymbolModality()
+}
+
+sealed class KtCommonSymbolModality : KtSymbolModality() {
+    object FINAL : KtCommonSymbolModality()
+    object ABSTRACT : KtCommonSymbolModality()
+    object OPEN : KtCommonSymbolModality()
+}