code completion for dynamic type elements

pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart

 // Copyright (c) 2014, 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.
 
 library services.completion.dart.cache;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element,
@@ skipping 48 matching lines @@
    * or `null` if nothing has been cached.
    */
   HashSet<String> _importedCompletions;
 
   /**
    * A map of simple identifier to imported class element
    * or `null` if nothing has been cached.
    */
   Map<String, ClassElement> importedClassMap;
 
+  /**
+   * The [ClassElement] for Object.
+   */
+  ClassElement _objectClassElement;
+
   DartCompletionCache(AnalysisContext context, Source source)
       : super(context, source);
 
   /**
    * Return a hash of the import directives for the cached import info
    * or `null` if nothing has been cached.
    */
   String get importKey => _importKey;
 
   /**
@@ skipping 46 matching lines @@
     Source coreUri = context.sourceFactory.forUri('dart:core');
     LibraryElement coreLib = context.getLibraryElement(coreUri);
     Namespace coreNamespace =
         new NamespaceBuilder().createPublicNamespaceForLibrary(coreLib);
     coreNamespace.definedNames.forEach((String name, Element elem) {
       if (elem is ClassElement) {
         importedClassMap[name] = elem;
       }
       addSuggestion(elem, CompletionRelevance.DEFAULT);
     });
+    _objectClassElement = importedClassMap['Object'];
 
     /*
      * Don't wait for search of lower relevance results to complete.
      * Set key indicating results are ready, and lower relevance results
      * will be added to the cache when the search completes.
      */
     _importKey = _computeImportKey(unit);
 
     // Add non-imported elements as low relevance
     Future<List<SearchMatch>> future =
         searchEngine.searchTopLevelDeclarations('');
     return future.then((List<SearchMatch> matches) {
       matches.forEach((SearchMatch match) {
         if (match.kind == MatchKind.DECLARATION) {
           Element element = match.element;
           if (element.isPublic &&
               !excludedLibs.contains(element.library) &&
               !_importedCompletions.contains(element.displayName)) {
             addSuggestion(element, CompletionRelevance.LOW);
           }
         }
       });
       return true;
     });
   }
 
   /**
+   * Return the [ClassElement] for Object.
+   */
+  ClassElement get objectClassElement {
+    if (_objectClassElement == null) {
+      Source coreUri = context.sourceFactory.forUri('dart:core');
+      LibraryElement coreLib = context.getLibraryElement(coreUri);
+      Namespace coreNamespace =
+          new NamespaceBuilder().createPublicNamespaceForLibrary(coreLib);
+      _objectClassElement = coreNamespace.definedNames['Object'];
+    }
+    return _objectClassElement;
+  }
+
+  /**
    * Return `true` if the import information is cached for the given
    * compilation unit.
    */
   bool isImportInfoCached(CompilationUnit unit) =>
       _importKey != null && _importKey == _computeImportKey(unit);
 
   void _addLibraryPrefixSuggestion(ImportElement importElem) {
     CompletionSuggestion suggestion = null;
     String completion = importElem.prefix.displayName;
     if (completion != null && completion.length > 0) {
@@ skipping 46 matching lines @@
   String _computeImportKey(CompilationUnit unit) {
     StringBuffer sb = new StringBuffer();
     unit.directives.forEach((Directive directive) {
       if (directive is ImportDirective) {
         sb.write(directive.toSource());
       }
     });
     return sb.toString();
   }
 }