respect show/hide combinators when generating suggestions

pkg/analysis_services/lib/src/completion/local_computer.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.computer.dart.local;
 
 import 'dart:async';
 
 import 'package:analysis_services/completion/completion_computer.dart';
 import 'package:analysis_services/completion/completion_suggestion.dart';
 import 'package:analyzer/src/generated/ast.dart';
 
 /**
  * A computer for calculating `completion.getSuggestions` request results
  * for the local library in which the completion is requested.
  */
 class LocalComputer extends CompletionComputer {
 
   @override
-  bool computeFast(CompilationUnit unit,
+  bool computeFast(CompilationUnit unit, AstNode node,
       List<CompletionSuggestion> suggestions) {
 
     // Find the specific child [AstNode] that contains the completion offset
     // and collect suggestions starting with that node
-    AstNode node = new NodeLocator.con1(offset).searchWithin(unit);
     if (node != null) {
       node.accept(new _LocalVisitor(offset, suggestions));
     }
 
     // If the unit is not a part and does not reference any parts
     // then work is complete
     return !unit.directives.any(
         (Directive directive) =>
             directive is PartOfDirective || directive is PartDirective);
   }
 
   @override
-  Future<bool> computeFull(CompilationUnit unit,
+  Future<bool> computeFull(CompilationUnit unit, AstNode node,
       List<CompletionSuggestion> suggestions) {
     // TODO: implement computeFull
     // include results from part files that are included in the library
     return new Future.value(false);
   }
 }
 
 /**
  * A visitor for collecting suggestions from the most specific child [AstNode]
  * that contains the completion offset to the [CompilationUnit].
@@ skipping 124 matching lines @@
         addSuggestion(param.identifier, CompletionSuggestionKind.PARAMETER);
       }
     });
     visitNode(node);
   }
 
   visitNode(AstNode node) {
     node.parent.accept(this);
   }
 }