Handle modifiers (abstract) on class nodes.

lib/compiler/implementation/scanner/class_element_parser.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class ClassElementParser extends PartialParser {
   ClassElementParser(Listener listener) : super(listener);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }
 
 class PartialClassElement extends ClassElement {
   final Token beginToken;
   final Token endToken;
-  Node cachedNode;
+  ClassNode cachedNode;
 
   PartialClassElement(SourceString name,
                       Token this.beginToken,
                       Token this.endToken,
                       Element enclosing,
                       int id)
       : super(name, enclosing, id, STATE_NOT_STARTED);
 
   void set supertypeLoadState(int state) {
     assert(state == supertypeLoadState + 1);
@@ skipping 24 matching lines @@
           // need compiler.
           compiler.patchParser.parsePatchClassNode(patch);
         }
       });
     });
     return cachedNode;
   }
 
   Token position() => beginToken;
 
+  // TODO(johnniwinther): Ensure that modifiers are always available.
+  Modifiers get modifiers =>
+      cachedNode != null ? cachedNode.modifiers : Modifiers.EMPTY;
+
   bool isInterface() => beginToken.stringValue === "interface";
-
-  PartialClassElement cloneTo(Element enclosing, DiagnosticListener listener) {
-    parseNode(listener);
-    // TODO(lrn): Is copying id acceptable?
-    // TODO(ahe): No.
-    PartialClassElement result =
-        new PartialClassElement(name, beginToken, endToken, enclosing, id);
-
-    assert(this.supertypeLoadState == STATE_NOT_STARTED);
-    assert(this.resolutionState == STATE_NOT_STARTED);
-    assert(this.type === null);
-    assert(this.supertype === null);
-    assert(this.defaultClass === null);
-    assert(this.interfaces === null);
-    assert(this.allSupertypes === null);
-    assert(this.backendMembers.isEmpty());
-
-    // Native is only used in DOM/HTML library for which we don't
-    // support patching.
-    assert(this.nativeName === null);
-
-    Link<Element> elementList = this.localMembers;
-    while (!elementList.isEmpty()) {
-      result.addMember(elementList.head.cloneTo(result, listener), listener);
-      elementList = elementList.tail;
-    }
-
-    result.cachedNode = cachedNode;
-    return result;
-  }
 }
 
 class MemberListener extends NodeListener {
   final ClassElement enclosingElement;
 
   MemberListener(DiagnosticListener listener,
                  Element enclosingElement)
       : this.enclosingElement = enclosingElement,
         super(listener, enclosingElement.getCompilationUnit());
 
@@ skipping 91 matching lines @@
   }
 
   void addMember(Element memberElement) {
     for (Link link = metadata; !link.isEmpty(); link = link.tail) {
       memberElement.addMetadata(link.head);
     }
     metadata = const EmptyLink<MetadataAnnotation>();
     enclosingElement.addMember(memberElement, listener);
   }
 }