Add KtPsiFactory#createFileWithLightClassSupport

Allows to create light classes for KtFile built from text

compiler/frontend/src/org/jetbrains/kotlin/psi/KtPsiFactory.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 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.
@@ -188,6 +188,12 @@ class KtPsiFactory(private val project: Project) {
         return file
     }
 
+    fun createFileWithLightClassSupport(fileName: String, text: String, contextToAnalyzeIn: PsiElement): KtFile {
+        val file = createPhysicalFile(fileName, text)
+        file.analysisContext = contextToAnalyzeIn
+        return file
+    }
+
     fun createPhysicalFile(fileName: String, text: String): KtFile {
         return PsiFileFactory.getInstance(project).createFileFromText(fileName, KotlinFileType.INSTANCE, text, LocalTimeCounter.currentTime(), true) as KtFile
     }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 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.
@@ -360,6 +360,9 @@ class KtFileClassProviderImpl(val lightClassGenerationSupport: LightClassGenerat
         val fileClassFqName = file.javaFileFacadeFqName
 
         val facadeClasses = when {
+            file.analysisContext != null && PackagePartClassUtils.fileHasTopLevelCallables(file) ->
+                listOf(KtLightClassForFacade.createForSyntheticFile(PsiManager.getInstance(file.project), fileClassFqName, file))
+
             jvmClassInfo.withJvmMultifileClass ->
                 lightClassGenerationSupport.getFacadeClasses(fileClassFqName, moduleInfo.contentScope())
 

idea/src/org/jetbrains/kotlin/idea/refactoring/changeSignature/KotlinChangeSignature.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 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.
@@ -147,8 +147,7 @@ class KotlinChangeSignature(project: Project,
             append("class Dummy {\n").append(ktSignature).append("{}\n}")
             toString()
         }
-        val dummyFile = LightVirtualFile("dummy.kt", KotlinFileType.INSTANCE, dummyFileText).toPsiFile(project) as KtFile
+        val dummyFile = KtPsiFactory(project).createFileWithLightClassSupport("dummy.kt", dummyFileText, originalMethod)
-        dummyFile.analysisContext = originalMethod
         val dummyDeclaration = (dummyFile.declarations.first() as KtClass).getBody()!!.declarations.first()
 
         // Convert to PsiMethod which can be used in Change Signature dialog

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

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2010-2016 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.psi.PsiClass
+import com.intellij.psi.PsiClassType
+import com.intellij.psi.PsiType
+import com.intellij.testFramework.LightProjectDescriptor
+import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.idea.test.KotlinWithJdkAndRuntimeLightProjectDescriptor
+import org.jetbrains.kotlin.idea.test.PluginTestCaseBase
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.psi.KtPsiFactory
+
+// see KtFileLightClassTest
+class LightClassFromTextTest : KotlinLightCodeInsightFixtureTestCase() {
+    override fun getProjectDescriptor(): LightProjectDescriptor = KotlinWithJdkAndRuntimeLightProjectDescriptor.INSTANCE
+
+    fun testSimple() {
+        myFixture.configureByText("Dummy.kt", "") as KtFile
+        val classes = classesFromText("class C {}\nobject O {}")
+        assertEquals(2, classes.size)
+        assertEquals("C", classes[0].qualifiedName)
+        assertEquals("O", classes[1].qualifiedName)
+    }
+
+    fun testFileClass() {
+        myFixture.configureByText("A.kt", "fun f() {}") as KtFile
+        val classes = classesFromText("fun g() {}", fileName = "A.kt")
+
+        assertEquals(1, classes.size)
+        val facadeClass = classes.single()
+        assertEquals("AKt", facadeClass.qualifiedName)
+
+        val gMethods = facadeClass.findMethodsByName("g", false)
+        assertEquals(1, gMethods.size)
+        assertEquals(PsiType.VOID, gMethods.single().returnType)
+
+        val fMethods = facadeClass.findMethodsByName("f", false)
+        assertEquals(0, fMethods.size)
+    }
+
+    fun testMultifileClass() {
+        myFixture.configureByFiles("multifile1.kt", "multifile2.kt")
+
+        val facadeClass = classesFromText("""
+        @file:kotlin.jvm.JvmMultifileClass
+        @file:kotlin.jvm.JvmName("Foo")
+
+        fun jar() {
+        }
+
+        fun boo() {
+        }
+         """).single()
+
+        assertEquals(1, facadeClass.findMethodsByName("jar", false).size)
+        assertEquals(1, facadeClass.findMethodsByName("boo", false).size)
+        assertEquals(0, facadeClass.findMethodsByName("bar", false).size)
+        assertEquals(0, facadeClass.findMethodsByName("foo", false).size)
+    }
+
+    fun testReferenceToOuterContext() {
+        val contextFile = myFixture.configureByText("Example.kt", "package foo\n class Example") as KtFile
+
+        val syntheticClass = classesFromText("""
+        package bar
+
+        import foo.Example
+
+        class Usage {
+            fun f(): Example = Example()
+        }
+         """).single()
+
+        val exampleClass = contextFile.classes.single()
+        assertEquals("Example", exampleClass.name)
+
+        val f = syntheticClass.findMethodsByName("f", false).single()
+        assertEquals(exampleClass, (f.returnType as PsiClassType).resolve())
+    }
+
+    private fun classesFromText(text: String, fileName: String = "A.kt"): Array<out PsiClass> {
+        val file = KtPsiFactory(project).createFileWithLightClassSupport(fileName, text, myFixture.file)
+        val classes = file.classes
+        return classes
+    }
+
+    override fun getTestDataPath(): String? {
+        return PluginTestCaseBase.getTestDataPathBase() + "/asJava/fileLightClass/"
+    }
+}