QmlJS: improve support for enum declarations

Add indentation and little highlighting for enums.
It just highlights the 'enum' keyword and the name of the enum, not its
values.

Task-number: QTCREATORBUG-19226
Change-Id: I36e46a27b0e32c4aecc8e91875c3d22df1814d93
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/libs/qmljs/qmljscodeformatter.cpp

@@ -177,6 +177,7 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
             case Property:      enter(property_start); break;
             case Function:      enter(function_start); break;
             case Signal:        enter(signal_start); break;
+            case Enum:          enter(enum_start); break;
             case On:
             case As:
             case List:
@@ -215,6 +216,11 @@ void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
             default:            leave(true); continue;
             } break;
 
+        case enum_start:
+            switch (kind) {
+            case LeftBrace: enter(objectliteral_open); break;
+            } break;
+
         case signal_start:
             switch (kind) {
             case Colon:         enter(binding_assignment); break; // oops, was a binding
@@ -931,6 +937,8 @@ CodeFormatter::TokenKind CodeFormatter::extendedTokenKind(const QmlJS::Token &to
             return On;
         if (text == QLatin1String("list"))
             return List;
+        if (text == QLatin1String("enum"))
+            return Enum;
     } else if (kind == Keyword) {
         const char char1 = text.at(0).toLatin1();
         const char char2 = text.at(1).toLatin1();

src/libs/qmljs/qmljscodeformatter.h

@@ -109,6 +109,8 @@ public: // must be public to make Q_GADGET introspection work
         property_name, // after the type
         property_maybe_initializer, // after the identifier
 
+        enum_start, // after 'enum'
+
         signal_start, // after 'signal'
         signal_maybe_arglist, // after identifier
         signal_arglist_open, // after '('
@@ -197,6 +199,7 @@ protected:
         Comma,
         Dot,
         Delimiter,
+        RegExp,
 
         EndOfExistingTokenKinds,
 
@@ -209,6 +212,7 @@ protected:
         Delete,
         Do,
         Else,
+        Enum,
         Finally,
         For,
         Function,