Rename: Support renaming class by short reference to companion object

#KT-16108 Fixed

idea/src/META-INF/plugin.xml

@@ -473,6 +473,7 @@
     <renameHandler implementation="org.jetbrains.kotlin.idea.refactoring.rename.RenameJvmNameHandler"/>
     <renameHandler implementation="org.jetbrains.kotlin.idea.refactoring.rename.KotlinDirectoryAsPackageRenameHandler"/>
     <renameHandler implementation="org.jetbrains.kotlin.idea.refactoring.rename.RenameBackingFieldReferenceHandler"/>
+    <renameHandler implementation="org.jetbrains.kotlin.idea.refactoring.rename.RenameClassByCompanionObjectShortReferenceHandler"/>
     <automaticRenamerFactory implementation="org.jetbrains.kotlin.idea.refactoring.rename.AutomaticVariableRenamerFactory"/>
     <automaticRenamerFactory implementation="org.jetbrains.kotlin.idea.refactoring.rename.AutomaticVariableRenamerFactoryForJavaClass"/>
     <automaticRenamerFactory implementation="org.jetbrains.kotlin.idea.refactoring.rename.AutomaticVariableInJavaRenamerFactory"/>

idea/src/org/jetbrains/kotlin/idea/refactoring/rename/AbstractReferenceSubstitutionRenameHandler.kt

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2010-2017 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.idea.refactoring.rename
+
+import com.intellij.openapi.actionSystem.CommonDataKeys
+import com.intellij.openapi.actionSystem.DataContext
+import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiFile
+import com.intellij.refactoring.rename.PsiElementRenameHandler
+import com.intellij.refactoring.rename.inplace.MemberInplaceRenameHandler
+import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.idea.codeInsight.DescriptorToSourceUtilsIde
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.psi.KtSimpleNameExpression
+import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
+
+abstract class AbstractReferenceSubstitutionRenameHandler<D : DeclarationDescriptor> : PsiElementRenameHandler() {
+    private val inplaceRenameHandler = MemberInplaceRenameHandler()
+
+    protected fun getReferenceExpression(dataContext: DataContext): KtSimpleNameExpression? {
+        val caret = CommonDataKeys.CARET.getData(dataContext) ?: return null
+        val ktFile = CommonDataKeys.PSI_FILE.getData(dataContext) as? KtFile ?: return null
+        return ktFile.findElementAt(caret.offset)?.getNonStrictParentOfType<KtSimpleNameExpression>() ?: return null
+    }
+
+    protected abstract fun getTargetDescriptor(dataContext: DataContext): D?
+
+    protected open fun getElementToRename(project: Project, descriptor: D): PsiElement? {
+        return DescriptorToSourceUtilsIde.getAnyDeclaration(project, descriptor)
+    }
+
+    override fun isAvailableOnDataContext(dataContext: DataContext): Boolean {
+        return CommonDataKeys.EDITOR.getData(dataContext) != null && getTargetDescriptor(dataContext) != null
+    }
+
+    override fun invoke(project: Project, editor: Editor?, file: PsiFile?, dataContext: DataContext) {
+        val descriptor = getTargetDescriptor(dataContext) ?: return
+        val wrappingContext = DataContext { id ->
+            if (CommonDataKeys.PSI_ELEMENT.`is`(id)) return@DataContext getElementToRename(project, descriptor)
+            dataContext.getData(id)
+        }
+        // Can't provide new name for inplace refactoring in unit test mode
+        if (!ApplicationManager.getApplication().isUnitTestMode && inplaceRenameHandler.isAvailableOnDataContext(wrappingContext)) {
+            inplaceRenameHandler.invoke(project, editor, file, wrappingContext)
+        }
+        else {
+            super.invoke(project, editor, file, wrappingContext)
+        }
+    }
+
+    override fun invoke(project: Project, elements: Array<out PsiElement>, dataContext: DataContext) {
+        // Can't be invoked outside of a text editor
+    }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/rename/RenameClassByCompanionObjectShortReferenceHandler.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010-2017 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.idea.refactoring.rename
+
+import com.intellij.openapi.actionSystem.DataContext
+import org.jetbrains.kotlin.descriptors.ClassifierDescriptor
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
+import org.jetbrains.kotlin.resolve.BindingContext
+import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
+
+class RenameClassByCompanionObjectShortReferenceHandler : AbstractReferenceSubstitutionRenameHandler<ClassifierDescriptor>() {
+    override fun getTargetDescriptor(dataContext: DataContext): ClassifierDescriptor? {
+        val refExpr = getReferenceExpression(dataContext) ?: return null
+        return refExpr.analyze(BodyResolveMode.PARTIAL)[BindingContext.SHORT_REFERENCE_TO_COMPANION_OBJECT, refExpr]
+    }
+}

idea/src/org/jetbrains/kotlin/idea/refactoring/rename/RenameJavaSyntheticPropertyHandler.kt

@@ -16,28 +16,25 @@
 
 package org.jetbrains.kotlin.idea.refactoring.rename
 
-import com.intellij.openapi.actionSystem.CommonDataKeys
 import com.intellij.openapi.actionSystem.DataContext
-import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
-import com.intellij.psi.*
+import com.intellij.psi.PsiElement
+import com.intellij.psi.PsiManager
+import com.intellij.psi.PsiMethod
+import com.intellij.psi.PsiNamedElement
 import com.intellij.psi.impl.light.LightElement
 import com.intellij.psi.search.SearchScope
-import com.intellij.refactoring.rename.PsiElementRenameHandler
 import com.intellij.refactoring.rename.RenamePsiElementProcessor
 import org.jetbrains.kotlin.idea.KotlinLanguage
 import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.util.IdeDescriptorRenderers
 import org.jetbrains.kotlin.load.java.JvmAbi
-import org.jetbrains.kotlin.psi.KtFile
-import org.jetbrains.kotlin.psi.KtSimpleNameExpression
-import org.jetbrains.kotlin.psi.psiUtil.getNonStrictParentOfType
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 import org.jetbrains.kotlin.resolve.source.getPsi
 import org.jetbrains.kotlin.synthetic.SyntheticJavaPropertyDescriptor
 
-class RenameJavaSyntheticPropertyHandler : PsiElementRenameHandler() {
+class RenameJavaSyntheticPropertyHandler : AbstractReferenceSubstitutionRenameHandler<SyntheticJavaPropertyDescriptor>() {
     class Processor : RenamePsiElementProcessor() {
         override fun prepareRenaming(element: PsiElement, newName: String, allRenames: MutableMap<PsiElement, String>, scope: SearchScope) {
             val propertyWrapper = element as? SyntheticPropertyWrapper ?: return
@@ -71,29 +68,12 @@ class RenameJavaSyntheticPropertyHandler : PsiElementRenameHandler() {
         }
     }
 
-    private fun getTargetDescriptor(dataContext: DataContext): SyntheticJavaPropertyDescriptor? {
-        val caret = CommonDataKeys.CARET.getData(dataContext) ?: return null
-        val ktFile = CommonDataKeys.PSI_FILE.getData(dataContext) as? KtFile ?: return null
-        val refExpr = ktFile.findElementAt(caret.offset)?.getNonStrictParentOfType<KtSimpleNameExpression>() ?: return null
+    override fun getTargetDescriptor(dataContext: DataContext): SyntheticJavaPropertyDescriptor? {
+        val refExpr = getReferenceExpression(dataContext) ?: return null
         return refExpr.analyze(BodyResolveMode.PARTIAL)[BindingContext.REFERENCE_TARGET, refExpr] as? SyntheticJavaPropertyDescriptor
     }
 
-    override fun isAvailableOnDataContext(dataContext: DataContext): Boolean {
-        return CommonDataKeys.EDITOR.getData(dataContext) != null && getTargetDescriptor(dataContext) != null
-    }
-
-    override fun invoke(project: Project, editor: Editor?, file: PsiFile?, dataContext: DataContext) {
-        val descriptor = getTargetDescriptor(dataContext) ?: return
-        val wrappingContext = DataContext { id ->
-            if (CommonDataKeys.PSI_ELEMENT.`is`(id)) {
-                return@DataContext SyntheticPropertyWrapper(PsiManager.getInstance(project), descriptor)
-            }
-            dataContext.getData(id)
-        }
-        super.invoke(project, editor, file, wrappingContext)
-    }
-
-    override fun invoke(project: Project, elements: Array<out PsiElement>, dataContext: DataContext) {
-        // Can't be invoked outside of a text editor
+    override fun getElementToRename(project: Project, descriptor: SyntheticJavaPropertyDescriptor): PsiElement? {
+        return SyntheticPropertyWrapper(PsiManager.getInstance(project), descriptor)
     }
 }

idea/testData/refactoring/rename/companionShortRef/after/test.kt

@@ -0,0 +1,9 @@
+class Bar {
+    companion object {
+        val VALUE = 42
+    }
+}
+
+fun main(args: Array<String>) {
+    println(Bar.VALUE)
+}

idea/testData/refactoring/rename/companionShortRef/before/test.kt

@@ -0,0 +1,9 @@
+class Foo {
+    companion object {
+        val VALUE = 42
+    }
+}
+
+fun main(args: Array<String>) {
+    println(/*rename*/Foo.VALUE)
+}

idea/testData/refactoring/rename/companionShortRef/companionShortRef.test

@@ -0,0 +1,5 @@
+{
+  "type": "SHORT_COMPANION_REFERENCE",
+  "mainFile": "test.kt",
+  "newName": "Bar"
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/rename/AbstractRenameTest.kt

@@ -21,7 +21,11 @@ import com.google.gson.JsonParser
 import com.intellij.codeInsight.TargetElementUtil
 import com.intellij.lang.properties.psi.PropertiesFile
 import com.intellij.lang.properties.psi.Property
+import com.intellij.openapi.actionSystem.CommonDataKeys
+import com.intellij.openapi.actionSystem.DataContext
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.editor.EditorFactory
+import com.intellij.openapi.editor.impl.CaretImpl
 import com.intellij.openapi.extensions.Extensions
 import com.intellij.openapi.fileEditor.FileDocumentManager
 import com.intellij.openapi.module.Module
@@ -37,6 +41,7 @@ import com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil
 import com.intellij.psi.search.GlobalSearchScope
 import com.intellij.refactoring.BaseRefactoringProcessor.ConflictsInTestsException
 import com.intellij.refactoring.MultiFileTestCase
+import com.intellij.refactoring.rename.PsiElementRenameHandler
 import com.intellij.refactoring.rename.RenameProcessor
 import com.intellij.refactoring.rename.RenamePsiElementProcessor
 import com.intellij.refactoring.rename.naming.AutomaticRenamerFactory
@@ -76,7 +81,8 @@ private enum class RenameType {
     MARKED_ELEMENT,
     FILE,
     BUNDLE_PROPERTY,
-    SYNTHETIC_PROPERTY
+    SYNTHETIC_PROPERTY,
+    SHORT_COMPANION_REFERENCE
 }
 
 abstract class AbstractRenameTest : KotlinMultiFileTestCase() {
@@ -123,6 +129,7 @@ abstract class AbstractRenameTest : KotlinMultiFileTestCase() {
                 RenameType.FILE -> renameFile(renameObject, context)
                 RenameType.BUNDLE_PROPERTY -> renameBundleProperty(renameObject, context)
                 RenameType.SYNTHETIC_PROPERTY -> renameSyntheticProperty(renameObject, context)
+                RenameType.SHORT_COMPANION_REFERENCE -> renameShortCompanionReference(renameObject, context)
             }
 
             if (hintDirective != null) {
@@ -364,6 +371,42 @@ abstract class AbstractRenameTest : KotlinMultiFileTestCase() {
         }
     }
 
+    private fun renameShortCompanionReference(renameParamsObject: JsonObject, context: TestContext) {
+        val mainFilePath = renameParamsObject.getString("mainFile")
+        val newName = renameParamsObject.getString("newName")
+
+        doTestCommittingDocuments { rootDir, rootAfter ->
+            configExtra(rootDir, renameParamsObject)
+
+            val psiFile = rootDir.findFileByRelativePath(mainFilePath)!!.toPsiFile(project)!!
+
+            val doc = PsiDocumentManager.getInstance(project).getDocument(psiFile)!!
+            val marker = doc.extractMarkerOffset(project, "/*rename*/")
+            assert(marker != -1)
+
+            val editor = EditorFactory.getInstance().createEditor(doc)
+            editor.caretModel.moveToOffset(marker)
+
+            try {
+                val handler = RenameClassByCompanionObjectShortReferenceHandler()
+                val dataContext = DataContext { dataId ->
+                    when (dataId) {
+                        CommonDataKeys.EDITOR.name -> editor
+                        CommonDataKeys.CARET.name -> editor.caretModel.currentCaret
+                        CommonDataKeys.PSI_FILE.name -> psiFile
+                        PsiElementRenameHandler.DEFAULT_NAME.name -> newName
+                        else -> null
+                    }
+                }
+                Assert.assertTrue(handler.isAvailableOnDataContext(dataContext))
+                handler.invoke(project, editor, psiFile, dataContext)
+            }
+            finally {
+                EditorFactory.getInstance().releaseEditor(editor)
+            }
+        }
+    }
+
     private fun runRenameProcessor(
             context: TestContext,
             newName: String,

idea/tests/org/jetbrains/kotlin/idea/refactoring/rename/RenameTestGenerated.java

@@ -192,6 +192,12 @@ public class RenameTestGenerated extends AbstractRenameTest {
         doTest(fileName);
     }
 
+    @TestMetadata("companionShortRef/companionShortRef.test")
+    public void testCompanionShortRef_CompanionShortRef() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/rename/companionShortRef/companionShortRef.test");
+        doTest(fileName);
+    }
+
     @TestMetadata("fileNotUnderSourceRootWithNamesakeUnderSourceRoot/fileNotUnderSourceRootWithNamesakeUnderSourceRoot.test")
     public void testFileNotUnderSourceRootWithNamesakeUnderSourceRoot_FileNotUnderSourceRootWithNamesakeUnderSourceRoot() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/rename/fileNotUnderSourceRootWithNamesakeUnderSourceRoot/fileNotUnderSourceRootWithNamesakeUnderSourceRoot.test");