Add quick fix to replace all 'class object's in project

idea/idea-analysis/src/org/jetbrains/kotlin/idea/JetBundle.properties

@@ -181,6 +181,8 @@ change.to.function.invocation=Change to function invocation
 migrate.sure=Replace sure() calls by !! in project
 migrate.class.object.to.default=Replace 'class' keyword with 'default' modifier
 migrate.class.object.to.default.family=Replace 'class' Keyword with 'default' Modifier
+migrate.class.object.to.default.in.whole.project=Replace 'class' keyword with 'default' modifier in whole project
+migrate.class.object.to.default.in.whole.project.family=Replace 'class' Keyword with 'default' Modifier in Whole Project
 remove.val.var.from.parameter=Remove ''{0}'' from parameter
 add.override.to.equals.hashCode.toString=Add 'override' to equals, hashCode, toString in project
 add.when.else.branch.action.family.name=Add Else Branch

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

@@ -20,9 +20,9 @@ import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.diagnostics.Diagnostic
 import org.jetbrains.kotlin.idea.JetBundle
+import org.jetbrains.kotlin.idea.project.PluginJetFilesProvider
 import org.jetbrains.kotlin.lexer.JetTokens
-import org.jetbrains.kotlin.psi.JetFile
-import org.jetbrains.kotlin.psi.JetObjectDeclaration
+import org.jetbrains.kotlin.psi.*
 
 public class ClassObjectToDefaultObjectFix(private val elem: JetObjectDeclaration) : JetIntentionAction<JetObjectDeclaration>(elem) {
     override fun getText(): String = JetBundle.message("migrate.class.object.to.default")
@@ -30,12 +30,44 @@ public class ClassObjectToDefaultObjectFix(private val elem: JetObjectDeclaratio
     override fun getFamilyName(): String = JetBundle.message("migrate.class.object.to.default.family")
 
     override fun invoke(project: Project, editor: Editor, file: JetFile) {
-        elem.getClassKeyword()?.delete()
-        elem.addModifier(JetTokens.DEFAULT_KEYWORD)
+        classKeywordToDefaultModifier(elem)
     }
 
     default object Factory : JetSingleIntentionActionFactory() {
         override fun createAction(diagnostic: Diagnostic) =
                 (diagnostic.getPsiElement() as? JetObjectDeclaration)?.let { ClassObjectToDefaultObjectFix(it) }
+
+        fun classKeywordToDefaultModifier(objectDeclaration: JetObjectDeclaration) {
+            objectDeclaration.getClassKeyword()?.delete()
+            if (!objectDeclaration.hasModifier(JetTokens.DEFAULT_KEYWORD)) {
+                objectDeclaration.addModifier(JetTokens.DEFAULT_KEYWORD)
+            }
+        }
+    }
+}
+
+public class ClassObjectToDefaultObjectInWholeProjectFix(private val elem: JetObjectDeclaration) : JetIntentionAction<JetObjectDeclaration>(elem) {
+    override fun getText(): String = JetBundle.message("migrate.class.object.to.default.in.whole.project")
+
+    override fun getFamilyName(): String = JetBundle.message("migrate.class.object.to.default.in.whole.project.family")
+
+    override fun invoke(project: Project, editor: Editor, file: JetFile) {
+        val files = PluginJetFilesProvider.allFilesInProject(file.getProject())
+
+        files.forEach { it.accept(ClassObjectToDefaultObjectVisitor) }
+    }
+
+    private object ClassObjectToDefaultObjectVisitor : JetTreeVisitorVoid() {
+        override fun visitObjectDeclaration(objectDeclaration: JetObjectDeclaration) {
+            objectDeclaration.acceptChildren(this)
+            if (objectDeclaration.getClassKeyword() != null) {
+                ClassObjectToDefaultObjectFix.classKeywordToDefaultModifier(objectDeclaration)
+            }
+        }
+    }
+
+    default object Factory : JetSingleIntentionActionFactory() {
+        override fun createAction(diagnostic: Diagnostic) =
+                (diagnostic.getPsiElement() as? JetObjectDeclaration)?.let { ClassObjectToDefaultObjectInWholeProjectFix(it) }
     }
 }

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

@@ -96,7 +96,8 @@ public class QuickFixRegistrar {
 
         JetSingleIntentionActionFactory removeRedundantModifierFactory = RemoveModifierFix.createRemoveModifierFactory(true);
         QuickFixes.factories.put(REDUNDANT_MODIFIER, removeRedundantModifierFactory);
-        QuickFixes.factories.put(ABSTRACT_MODIFIER_IN_TRAIT, RemoveModifierFix.createRemoveModifierFromListOwnerFactory(ABSTRACT_KEYWORD, true));
+        QuickFixes.factories.put(ABSTRACT_MODIFIER_IN_TRAIT, RemoveModifierFix.createRemoveModifierFromListOwnerFactory(ABSTRACT_KEYWORD,
+                                                                                                                        true));
         QuickFixes.factories.put(OPEN_MODIFIER_IN_TRAIT, RemoveModifierFix.createRemoveModifierFromListOwnerFactory(OPEN_KEYWORD, true));
         QuickFixes.factories.put(TRAIT_CAN_NOT_BE_FINAL, removeFinalModifierFactory);
         QuickFixes.factories.put(REDUNDANT_PROJECTION, RemoveModifierFix.createRemoveProjectionFactory(true));
@@ -296,5 +297,6 @@ public class QuickFixRegistrar {
         QuickFixes.factories.put(UNRESOLVED_REFERENCE, CreateClassFromCallWithConstructorCalleeActionFactory.INSTANCE$);
 
         QuickFixes.factories.put(DEPRECATED_CLASS_OBJECT_SYNTAX, ClassObjectToDefaultObjectFix.Factory);
+        QuickFixes.factories.put(DEPRECATED_CLASS_OBJECT_SYNTAX, ClassObjectToDefaultObjectInWholeProjectFix.Factory);
     }
 }

idea/testData/quickfix/migration/classObjectToDefaultMultiple.after.data.Sample.kt

@@ -0,0 +1,29 @@
+class D {
+    default public object Named {
+
+    }
+}
+
+trait H {
+    default object {
+
+    }
+}
+
+class E {
+    default object {
+        class D {
+            default object {
+                class D {
+                    default object
+                }
+            }
+        }
+    }
+}
+
+class K {
+    default object Default
+
+    class Object
+}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.after.kt

@@ -0,0 +1,19 @@
+// "Replace 'class' keyword with 'default' modifier in whole project" "true"
+
+class A {
+    public default object {
+
+    }
+}
+
+class B {
+    default object {
+
+    }
+}
+
+class C {
+    default object Named {
+
+    }
+}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.before.Main.kt

@@ -0,0 +1,19 @@
+// "Replace 'class' keyword with 'default' modifier in whole project" "true"
+
+class A {
+    public class<caret> object {
+
+    }
+}
+
+class B {
+    class object {
+
+    }
+}
+
+class C {
+    class object Named {
+
+    }
+}

idea/testData/quickfix/migration/classObjectToDefaultMultiple.before.data.Sample.kt

@@ -0,0 +1,29 @@
+class D {
+    default public class object Named {
+
+    }
+}
+
+trait H {
+    default class object {
+
+    }
+}
+
+class E {
+    class object {
+        class D {
+            class object {
+                class D {
+                    class object
+                }
+            }
+        }
+    }
+}
+
+class K {
+    default object Default
+
+    class Object
+}

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixMultiFileTestGenerated.java

@@ -35,6 +35,7 @@ import java.util.regex.Pattern;
         QuickFixMultiFileTestGenerated.AutoImports.class,
         QuickFixMultiFileTestGenerated.ChangeSignature.class,
         QuickFixMultiFileTestGenerated.CreateFromUsage.class,
+        QuickFixMultiFileTestGenerated.Migration.class,
         QuickFixMultiFileTestGenerated.Modifiers.class,
         QuickFixMultiFileTestGenerated.Nullables.class,
         QuickFixMultiFileTestGenerated.Override.class,
@@ -853,6 +854,21 @@ public class QuickFixMultiFileTestGenerated extends AbstractQuickFixMultiFileTes
         }
     }
 
+    @TestMetadata("idea/testData/quickfix/migration")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class Migration extends AbstractQuickFixMultiFileTest {
+        public void testAllFilesPresentInMigration() throws Exception {
+            JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/quickfix/migration"), Pattern.compile("^(\\w+)\\.before\\.Main\\.kt$"), true);
+        }
+
+        @TestMetadata("classObjectToDefaultMultiple.before.Main.kt")
+        public void testClassObjectToDefaultMultiple() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/migration/classObjectToDefaultMultiple.before.Main.kt");
+            doTestWithExtraFile(fileName);
+        }
+    }
+
     @TestMetadata("idea/testData/quickfix/modifiers")
     @TestDataPath("$PROJECT_ROOT")
     @InnerTestClasses({