Rename: Forbid on backing field reference

#KT-14285 Fixed

ChangeLog.md

@@ -249,6 +249,7 @@ These artifacts include extensions for the types available in the latter JDKs, s
 - [`KT-6199`](https://youtrack.jetbrains.com/issue/KT-6199) Rename: Replace non-code class occurrences with new qualified name
 - [`KT-14182`](https://youtrack.jetbrains.com/issue/KT-14182) Move: Show error message on applying to enum entries
 - Extract Function: Support implicit abnormal exits via Nothing-typed expressions
+- [`KT-14285`](https://youtrack.jetbrains.com/issue/KT-14285) Rename: Forbid on backing field reference
 
 ##### New features
 

idea/src/META-INF/plugin.xml

@@ -451,6 +451,7 @@
     <renameHandler implementation="org.jetbrains.kotlin.idea.refactoring.rename.JavaMemberByKotlinReferenceInplaceRenameHandler"/>
     <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"/>
     <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/RenameBackingFieldReferenceHandler.kt

@@ -0,0 +1,48 @@
+/*
+ * 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.idea.refactoring.rename
+
+import com.intellij.openapi.actionSystem.DataContext
+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.psi.util.PsiTreeUtil
+import com.intellij.refactoring.rename.inplace.VariableInplaceRenameHandler
+import org.jetbrains.kotlin.descriptors.impl.SyntheticFieldDescriptor
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
+import org.jetbrains.kotlin.idea.codeInsight.CodeInsightUtils
+import org.jetbrains.kotlin.psi.KtSimpleNameExpression
+import org.jetbrains.kotlin.resolve.BindingContext
+
+class RenameBackingFieldReferenceHandler: VariableInplaceRenameHandler() {
+    override fun isAvailable(element: PsiElement?, editor: Editor, file: PsiFile): Boolean {
+        val refExpression = PsiTreeUtil.findElementOfClassAtOffset(
+                file, editor.caretModel.offset, KtSimpleNameExpression::class.java, false
+        ) ?: return false
+        if (refExpression.text != "field") return false
+        return refExpression.analyze()[BindingContext.REFERENCE_TARGET, refExpression] is SyntheticFieldDescriptor
+    }
+
+    override fun invoke(project: Project, editor: Editor, file: PsiFile, dataContext: DataContext?) {
+        CodeInsightUtils.showErrorHint(project, editor, "Rename is not applicable to backing field reference", "Rename", null)
+    }
+
+    override fun invoke(project: Project, elements: Array<out PsiElement>, dataContext: DataContext?) {
+        // Do nothing: this method is called not from editor
+    }
+}