FE 1.0: introduce deprecation EXPOSED_FROM_PRIVATE_IN_FILE

#KT-20094 Fixed

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/Errors.java

@@ -140,6 +140,7 @@ public interface Errors {
     DiagnosticFactory3<KtSuperTypeListEntry, EffectiveVisibility, DescriptorWithRelation, EffectiveVisibility> EXPOSED_SUPER_CLASS = DiagnosticFactory3.create(ERROR);
     DiagnosticFactory3<KtSuperTypeListEntry, EffectiveVisibility, DescriptorWithRelation, EffectiveVisibility> EXPOSED_SUPER_INTERFACE = DiagnosticFactory3.create(ERROR);
     DiagnosticFactory3<PsiElement, EffectiveVisibility, DescriptorWithRelation, EffectiveVisibility> EXPOSED_TYPEALIAS_EXPANDED_TYPE = DiagnosticFactory3.create(ERROR);
+    DiagnosticFactory2<PsiElement, DescriptorWithRelation, EffectiveVisibility> EXPOSED_FROM_PRIVATE_IN_FILE = DiagnosticFactory2.create(WARNING);
 
     DiagnosticFactory2<KtExpression, KotlinType, Collection<ClassDescriptor>> INACCESSIBLE_TYPE = DiagnosticFactory2.create(WARNING);
 

compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering/DefaultErrorMessages.java

@@ -81,6 +81,7 @@ public class DefaultErrorMessages {
         MAP.put(EXPOSED_SUPER_CLASS, "''{0}'' subclass exposes its ''{2}'' supertype{1}", TO_STRING, TO_STRING, TO_STRING);
         MAP.put(EXPOSED_SUPER_INTERFACE, "''{0}'' sub-interface exposes its ''{2}'' supertype{1}", TO_STRING, TO_STRING, TO_STRING);
         MAP.put(EXPOSED_TYPEALIAS_EXPANDED_TYPE, "''{0}'' typealias exposes ''{2}'' in expanded type{1}", TO_STRING, TO_STRING, TO_STRING);
+        MAP.put(EXPOSED_FROM_PRIVATE_IN_FILE, "Deprecation: private-in-file class should not expose ''{1}'' type{0}", TO_STRING, TO_STRING);
 
         MAP.put(EXTENSION_SHADOWED_BY_MEMBER, "Extension is shadowed by a member: {0}", COMPACT_WITH_MODIFIERS);
         MAP.put(EXTENSION_FUNCTION_SHADOWED_BY_INNER_CLASS_CONSTRUCTOR,

compiler/frontend/src/org/jetbrains/kotlin/resolve/ExposedVisibilityChecker.kt

@@ -35,7 +35,14 @@ class ExposedVisibilityChecker(private val trace: BindingTrace? = null) {
         elementVisibility: EffectiveVisibility,
         restrictingDescriptor: DescriptorWithRelation
     ) {
-        trace?.report(diagnostic.on(element, elementVisibility, restrictingDescriptor, restrictingDescriptor.effectiveVisibility()))
+        val trace = trace ?: return
+        val restrictingVisibility = restrictingDescriptor.effectiveVisibility()
+        if (elementVisibility == EffectiveVisibility.PrivateInFile) {
+            // Deprecation: condition ^ should be changed to false after 1.6
+            trace.report(EXPOSED_FROM_PRIVATE_IN_FILE.on(element, restrictingDescriptor, restrictingVisibility))
+        } else {
+            trace.report(diagnostic.on(element, elementVisibility, restrictingDescriptor, restrictingVisibility))
+        }
     }
 
     // NB: does not check any members

compiler/testData/diagnostics/tests/exposed/privateInFile.kt

@@ -11,17 +11,17 @@ class Public {
 private class PrivateInFileClass {
     private open class NestedPrivate
 
-    fun <!EXPOSED_FUNCTION_RETURN_TYPE!>test1<!>() = NestedPrivate()
-    fun test2(<!EXPOSED_PARAMETER_TYPE!>p: NestedPrivate<!>) {}
-    fun <!EXPOSED_RECEIVER_TYPE!>NestedPrivate<!>.test3() {}
-    val <!EXPOSED_PROPERTY_TYPE!>test4<!> = NestedPrivate()
-    class Test5 : <!EXPOSED_SUPER_CLASS!>NestedPrivate()<!>
+    fun <!EXPOSED_FROM_PRIVATE_IN_FILE!>test1<!>() = NestedPrivate()
+    fun test2(<!EXPOSED_FROM_PRIVATE_IN_FILE!>p: NestedPrivate<!>) {}
+    fun <!EXPOSED_FROM_PRIVATE_IN_FILE!>NestedPrivate<!>.test3() {}
+    val <!EXPOSED_FROM_PRIVATE_IN_FILE!>test4<!> = NestedPrivate()
+    class Test5 : <!EXPOSED_FROM_PRIVATE_IN_FILE!>NestedPrivate()<!>
 }
 
 private interface PrivateInFile {
     private class Private
 
-    fun <!EXPOSED_FUNCTION_RETURN_TYPE!>expose<!>() = Private()
+    fun <!EXPOSED_FROM_PRIVATE_IN_FILE!>expose<!>() = Private()
 }
 
 // Exposes 'PrivateInFile$Private' via 'expose'

compiler/testData/diagnostics/tests/imports/PrivateClassReferencedError.kt

@@ -11,4 +11,4 @@ package a
 
 import pack1.SomeClass.*
 
-private class X : <!EXPOSED_SUPER_CLASS!><!FINAL_SUPERTYPE, INVISIBLE_MEMBER, INVISIBLE_REFERENCE!>N<!>()<!>
+private class X : <!EXPOSED_FROM_PRIVATE_IN_FILE!><!FINAL_SUPERTYPE, INVISIBLE_MEMBER, INVISIBLE_REFERENCE!>N<!>()<!>

idea/src/org/jetbrains/kotlin/idea/quickfix/QuickFixRegistrar.kt

@@ -199,7 +199,7 @@ class QuickFixRegistrar : QuickFixContributor {
 
         for (exposed in listOf(
             EXPOSED_FUNCTION_RETURN_TYPE, EXPOSED_PARAMETER_TYPE, EXPOSED_PROPERTY_TYPE, EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR,
-            EXPOSED_RECEIVER_TYPE, EXPOSED_SUPER_CLASS, EXPOSED_SUPER_INTERFACE, EXPOSED_TYPE_PARAMETER_BOUND
+            EXPOSED_RECEIVER_TYPE, EXPOSED_SUPER_CLASS, EXPOSED_SUPER_INTERFACE, EXPOSED_TYPE_PARAMETER_BOUND, EXPOSED_FROM_PRIVATE_IN_FILE
         )) {
             exposed.registerFactory(ChangeVisibilityOnExposureFactory)
         }