implement KtFile.getClasses() in plugin (required to have coverage work, among other things)

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/IDELightClassGenerationSupport.kt

@@ -309,7 +309,7 @@ class IDELightClassGenerationSupport(private val project: Project) : LightClassG
         return getClassRelativeName(parent).child(name)
     }
 
-    private fun createLightClassForDecompiledKotlinFile(file: KtFile): KtLightClassForDecompiledDeclaration? {
+    fun createLightClassForDecompiledKotlinFile(file: KtFile): KtLightClassForDecompiledDeclaration? {
         val virtualFile = file.virtualFile ?: return null
 
         val classOrObject = file.declarations.filterIsInstance<KtClassOrObject>().singleOrNull()
@@ -351,3 +351,21 @@ class IDELightClassGenerationSupport(private val project: Project) : LightClassG
         private val LOG = Logger.getInstance(IDELightClassGenerationSupport::class.java)
     }
 }
+
+class KtFileClassProviderImpl(val lightClassGenerationSupport: LightClassGenerationSupport) : KtFileClassProvider {
+    override fun getFileClasses(file: KtFile): Array<PsiClass> {
+        if (file.isCompiled) {
+            return arrayOf()
+        }
+
+        val result = arrayListOf<PsiClass>()
+        file.declarations.filterIsInstance<KtClassOrObject>().map { lightClassGenerationSupport.getPsiClass(it) }.filterNotNullTo(result)
+
+        val moduleInfo = file.getModuleInfo()
+        val fileClassFqName = file.javaFileFacadeFqName
+        lightClassGenerationSupport.getFacadeClasses(fileClassFqName, moduleInfo.contentScope()).filterTo(result) {
+            it is KtLightClassForFacade && file in it.files
+        }
+        return result.toTypedArray()
+    }
+}

idea/src/META-INF/plugin.xml

@@ -224,6 +224,9 @@
     <projectService serviceInterface="org.jetbrains.kotlin.asJava.LightClassGenerationSupport"
                     serviceImplementation="org.jetbrains.kotlin.idea.caches.resolve.IDELightClassGenerationSupport"/>
 
+    <projectService serviceInterface="org.jetbrains.kotlin.psi.KtFileClassProvider"
+                    serviceImplementation="org.jetbrains.kotlin.idea.caches.resolve.KtFileClassProviderImpl"/>
+
     <projectService serviceInterface="org.jetbrains.kotlin.resolve.CodeAnalyzerInitializer"
                     serviceImplementation="org.jetbrains.kotlin.resolve.DummyCodeAnalyzerInitializer"/>
 

idea/tests/org/jetbrains/kotlin/asJava/KtFileLightClassTest.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.asJava
+
+import com.intellij.testFramework.LightProjectDescriptor
+import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.idea.test.KotlinLightProjectDescriptor
+import org.jetbrains.kotlin.psi.KtFile
+
+class KtFileLightClassTest : KotlinLightCodeInsightFixtureTestCase() {
+    override fun getProjectDescriptor(): LightProjectDescriptor = KotlinLightProjectDescriptor.INSTANCE
+
+    fun testSimple() {
+        val file = myFixture.configureByText("A.kt", "class C {}\nobject O {}") as KtFile
+        val classes = file.classes
+        assertEquals(2, classes.size)
+        assertEquals("C", classes[0].qualifiedName)
+        assertEquals("O", classes[1].qualifiedName)
+    }
+
+    fun testFileClass() {
+        val file = myFixture.configureByText("A.kt", "fun f() {}") as KtFile
+        val classes = file.classes
+        assertEquals(1, classes.size)
+        assertEquals("AKt", classes[0].qualifiedName)
+    }
+}