rename and improve imported completion computer

pkg/analysis_services/lib/src/completion/top_level_computer.dart

Index: pkg/analysis_services/lib/src/completion/top_level_computer.dart
diff --git a/pkg/analysis_services/lib/src/completion/top_level_computer.dart b/pkg/analysis_services/lib/src/completion/top_level_computer.dart
deleted file mode 100644
index 536e473776bea44f0408ba9b16fc4e65c540f7a8..0000000000000000000000000000000000000000
--- a/pkg/analysis_services/lib/src/completion/top_level_computer.dart
+++ /dev/null
@@ -1,65 +0,0 @@
-// 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.computer.dart.toplevel;
-
-import 'dart:async';
-
-import 'package:analysis_services/completion/completion_computer.dart';
-import 'package:analysis_services/completion/completion_suggestion.dart';
-import 'package:analysis_services/search/search_engine.dart';
-import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart';
-
-/**
- * A computer for calculating class and top level variable
- * `completion.getSuggestions` request results
- */
-class TopLevelComputer extends CompletionComputer {
-
-  @override
-  bool computeFast(CompilationUnit unit,
-      List<CompletionSuggestion> suggestions) {
-    // TODO: implement computeFast
-    return false;
-  }
-
-  @override
-  Future<bool> computeFull(CompilationUnit unit,
-      List<CompletionSuggestion> suggestions) {
-    var future = searchEngine.searchTopLevelDeclarations('');
-    return future.then((List<SearchMatch> matches) {
-
-      // Compute the set of visible libraries to determine relevance
-      var visibleLibraries = new Set<LibraryElement>();
-      var unitLibrary = unit.element.library;
-      visibleLibraries.add(unitLibrary);
-      visibleLibraries.addAll(unitLibrary.importedLibraries);
-
-      // Compute the set of possible classes and top level variables
-      matches.forEach((SearchMatch match) {
-        if (match.kind == MatchKind.DECLARATION) {
-          Element element = match.element;
-          if (element.isPublic || element.library == unitLibrary) {
-            String completion = element.displayName;
-            var relevance = visibleLibraries.contains(element.library) ?
-                CompletionRelevance.DEFAULT :
-                CompletionRelevance.LOW;
-            suggestions.add(
-                new CompletionSuggestion(
-                    CompletionSuggestionKind.fromElementKind(element.kind),
-                    relevance,
-                    completion,
-                    completion.length,
-                    0,
-                    element.isDeprecated,
-                    false // isPotential
-            ));
-          }
-        }
-      });
-      return true;
-    });
-  }
-}