extract LocalLibraryContributor from imported reference contributor

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'
@@ skipping 222 matching lines @@
               });
             } else {
               // Exclude elements from prefixed imports
               // because they are provided by PrefixedElementContributor
               // Suggested by LibraryPrefixContributor
               // _addLibraryPrefixSuggestion(importElem);
               // excludedLibs.add(importElem.importedLibrary);
             }
           }
         } else if (directive is PartDirective) {
-          CompilationUnitElement partElem = directive.element;
-          if (partElem != null && partElem.source != source) {
-            partElem.accept(new _NonLocalElementCacheVisitor(this));
-          }
+          // Suggested by LocalLibraryContributor
+          // CompilationUnitElement partElem = directive.element;
+          // if (partElem != null && partElem.source != source) {
+          //   partElem.accept(new _NonLocalElementCacheVisitor(this));
+          // }
         }
       });
       if (libSource != source) {
-        libUnit.element.accept(new _NonLocalElementCacheVisitor(this));
+        // Suggested by LocalLibraryContributor
+        // libUnit.element.accept(new _NonLocalElementCacheVisitor(this));
       }
     }
   }
 
   /**
    * Add suggestions for all top level elements in the context
    * excluding those elemnents for which suggestions have already been added.
    */
   void _addNonImportedElementSuggestions(
       List<SearchMatch> matches, Set<LibraryElement> excludedLibs) {
@@ skipping 85 matching lines @@
     if (libSource == source) {
       return new Future.value(unit);
     }
     // If [source] is a part, then compute the library unit
     if (libSource != null) {
       return context.computeResolvedCompilationUnitAsync(libSource, libSource);
     }
     return new Future.value(null);
   }
 }
-
-/**
- * A visitor for building suggestions based upon the elements defined by
- * a source file contained in the same library but not the same as
- * the source in which the completions are being requested.
- */
-class _NonLocalElementCacheVisitor extends GeneralizingElementVisitor {
-  final DartCompletionCache cache;
-
-  _NonLocalElementCacheVisitor(this.cache);
-
-  @override
-  void visitClassElement(ClassElement element) {
-    cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
-  }
-
-  @override
-  void visitCompilationUnitElement(CompilationUnitElement element) {
-    element.visitChildren(this);
-  }
-
-  @override
-  void visitElement(Element element) {
-    // ignored
-  }
-
-  @override
-  void visitFunctionElement(FunctionElement element) {
-    cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
-  }
-
-  @override
-  void visitFunctionTypeAliasElement(FunctionTypeAliasElement element) {
-    cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
-  }
-
-  @override
-  void visitTopLevelVariableElement(TopLevelVariableElement element) {
-    cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
-  }
-}