qmljs: correctly handle required and readonly properties

* correct indentation after required property QTCREATORBUG-24144
* handle required <name> statement
* allow default readoly required reordering
* more permissive than the actual parser (which then will show errors
for invalid sequences)
* backport form QmlDom

Fixes: QTCREATORBUG-24144
Change-Id: I19166ca65d108d533a1ed3748c09e35bcfdbc56d
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/libs/qmljs/qmljscodeformatter.cpp

@@ -163,6 +163,8 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
             case Import:
             case Signal:
             case Property:
+            case Required:
+            case Readonly:
             case Identifier:    enter(expression_or_objectdefinition); break;
 
             // error recovery
@@ -175,8 +177,10 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
         case objectdefinition_open:
             switch (kind) {
             case RightBrace:    leave(true); break;
-            case Default:       enter(default_property_start); break;
+            case Default:
+            case Readonly:      enter(property_modifiers); break;
             case Property:      enter(property_start); break;
+            case Required:      enter(required_property); break;
             case Function:      enter(function_start); break;
             case Signal:        enter(signal_start); break;
             case Enum:          enter(enum_start); break;
@@ -187,12 +191,14 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
             case Identifier:    enter(binding_or_objectdefinition); break;
             } break;
 
-        case default_property_start:
-            if (kind != Property)
-                leave(true);
-            else
-                turnInto(property_start);
-            break;
+        case property_modifiers:
+            switch (kind) {
+            case Property:      turnInto(property_start); break;
+            case Default:
+            case Readonly:      break;
+            case Required:      turnInto(required_property); break;
+            default:            leave(true); break;
+            } break;
 
         case property_start:
             switch (kind) {
@@ -203,6 +209,15 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
             default:            leave(true); continue;
             } break;
 
+        case required_property:
+            switch (kind) {
+            case Property:      turnInto(property_start); break;
+            case Default:
+            case Readonly:      turnInto(property_modifiers); break;
+            case Identifier:    leave(true); break;
+            default:            leave(true); continue;
+            } break;
+
         case property_name:
             turnInto(property_maybe_initializer);
             break;
@@ -788,6 +803,8 @@ bool CodeFormatter::tryStatement()
     case As:
     case List:
     case Property:
+    case Required:
+    case Readonly:
     case Function:
     case Number:
     case String:
@@ -938,6 +955,10 @@ CodeFormatter::TokenKind CodeFormatter::extendedTokenKind(const QmlJS::Token &to
             return Signal;
         if (text == QLatin1String("property"))
             return Property;
+        if (text == QLatin1String("readonly"))
+            return Readonly;
+        if (text == QLatin1String("required"))
+            return Required;
         if (text == QLatin1String("on"))
             return On;
         if (text == QLatin1String("list"))

src/libs/qmljs/qmljscodeformatter.h

@@ -104,7 +104,8 @@ public: // must be public to make Q_GADGET introspection work
         import_as,
 
         property_start, // after 'property'
-        default_property_start, // after 'default'
+        property_modifiers, // after 'default' or readonly
+        required_property, // after required
         property_list_open, // after 'list' as a type
         property_name, // after the type
         property_maybe_initializer, // after the identifier
@@ -237,6 +238,8 @@ protected:
         As,
         List,
         Property,
+        Required,
+        Readonly,
 
         Question,
         PlusPlus,

src/libs/qmljs/qmljsreformatter.cpp

@@ -669,6 +669,14 @@ protected:
         return false;
     }
 
+    bool visit(UiRequired *ast) override
+    {
+        out(ast->requiredToken);
+        out(" ");
+        out(ast->name.toString());
+        return true;
+    }
+
     bool visit(UiObjectBinding *ast) override
     {
         if (ast->hasOnToken) {

tests/auto/qml/reformatter/qmlreadonly.qml

@@ -2,4 +2,13 @@ import QtQuick 2.0
 
 Item {
     readonly property int horse: 40
+    required property Item theItem
+    required data
+
+    function foo() {
+        theItem.foo("The issue is exacerbated if the object literal is wrapped onto the next line like so:",
+                    {
+                        "foo": theFoo
+                    })
+    }
 }