Add data modifier to a class quickfix #KT-18220 Fixed

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

@@ -0,0 +1,80 @@
+/*
+ * 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.quickfix
+
+import org.jetbrains.kotlin.descriptors.CallableDescriptor
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.diagnostics.Diagnostic
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
+import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
+import org.jetbrains.kotlin.idea.core.isVisible
+import org.jetbrains.kotlin.lexer.KtTokens
+import org.jetbrains.kotlin.psi.KtClass
+import org.jetbrains.kotlin.psi.KtDestructuringDeclarationEntry
+import org.jetbrains.kotlin.psi.KtExpression
+import org.jetbrains.kotlin.psi.KtModifierListOwner
+import org.jetbrains.kotlin.resolve.BindingContext
+import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
+import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
+
+class AddDataModifierFix(element: KtClass, private val fqName: String) : AddModifierFix(element, KtTokens.DATA_KEYWORD) {
+
+    override fun getText() = "Make '$fqName' data class"
+
+    override fun getFamilyName() = text
+
+    companion object : KotlinSingleIntentionActionFactory() {
+
+        override fun createAction(diagnostic: Diagnostic): KotlinQuickFixAction<KtModifierListOwner>? {
+            val element = diagnostic.psiElement as? KtExpression ?: return null
+            val context = element.analyze()
+
+            val callableDescriptor = if (element is KtDestructuringDeclarationEntry) {
+                context[BindingContext.DECLARATION_TO_DESCRIPTOR, element.parent.parent] as? CallableDescriptor
+            }
+            else {
+                element.getResolvedCall(context)?.resultingDescriptor
+            }
+
+            val constructor = callableDescriptor?.returnType?.arguments?.firstOrNull()?.type?.constructor
+                              ?: callableDescriptor?.returnType?.constructor
+
+            val classDescriptor = constructor?.declarationDescriptor as? ClassDescriptor ?: return null
+
+            val modality = classDescriptor.modality
+            if (modality != Modality.FINAL || classDescriptor.isInner) return null
+            val ctorParams = classDescriptor.constructors.firstOrNull { it.isPrimary }?.valueParameters ?: return null
+            if (ctorParams.isEmpty()) return null
+
+            if (!ctorParams.all {
+                if (it.varargElementType != null) return@all false
+                val property = context[BindingContext.VALUE_PARAMETER_AS_PROPERTY, it] ?: return@all false
+                // NB: we use element as receiver because element is a constructor call
+                // which is effectively used as receiver by destructuring declaration
+                property.isVisible(element, element, context, element.getResolutionFacade())
+            }) return null
+
+            val klass = DescriptorToSourceUtils.descriptorToDeclaration(classDescriptor) as? KtClass ?: return null
+            val fqName = DescriptorUtils.getFqName(classDescriptor).asString()
+            return AddDataModifierFix(klass, fqName)
+        }
+
+    }
+
+}

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

@@ -158,7 +158,7 @@ class QuickFixRegistrar : QuickFixContributor {
         FUNCTION_EXPECTED.registerFactory(InvokeImportFix)
 
         DELEGATE_SPECIAL_FUNCTION_MISSING.registerFactory(DelegateAccessorsImportFix)
-        COMPONENT_FUNCTION_MISSING.registerFactory(ComponentsImportFix)
+        COMPONENT_FUNCTION_MISSING.registerFactory(ComponentsImportFix, AddDataModifierFix)
 
         NO_GET_METHOD.registerFactory(ArrayAccessorImportFix)
         NO_SET_METHOD.registerFactory(ArrayAccessorImportFix)