refactor library prefix suggestion generation

pkg/analysis_server/lib/src/services/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_server/src/protocol.dart' as protocol show Element, ElementKind;
 import 'package:analysis_server/src/protocol.dart' hide Element, ElementKind;
@@ skipping 86 matching lines @@
         _addFieldSuggestions(node, classMbr);
       } else if (classMbr is MethodDeclaration) {
         _addMethodSuggestion(node, classMbr);
       }
     });
     visitNode(node);
   }
 
   @override
   visitCompilationUnit(CompilationUnit node) {
-    node.directives.forEach((Directive directive) {
-      if (directive is ImportDirective) {
-        _addLibraryPrefixSuggestion(directive);
-      }
-    });
     node.declarations.forEach((Declaration declaration) {
       if (declaration is ClassDeclaration) {
         _addClassSuggestion(declaration);
       } else if (declaration is EnumDeclaration) {
 //        _addSuggestion(d.name, CompletionSuggestionKind.ENUM);
       } else if (declaration is FunctionDeclaration) {
         _addFunctionSuggestion(declaration);
       } else if (declaration is TopLevelVariableDeclaration) {
         _addTopLevelVarSuggestions(declaration.variables);
       } else if (declaration is ClassTypeAlias) {
@@ skipping 128 matching lines @@
     if (suggestion != null) {
       suggestion.element = _createElement(
           protocol.ElementKind.FUNCTION,
           declaration.name,
           declaration.returnType,
           false,
           _isDeprecated(declaration.metadata));
     }
   }
 
-  void _addLibraryPrefixSuggestion(ImportDirective directive) {
-    CompletionSuggestion suggestion = _addSuggestion(
-        directive.prefix,
-        CompletionSuggestionKind.LIBRARY_PREFIX,
-        null,
-        null);
-    if (suggestion != null) {
-      suggestion.element = _createElement(
-          protocol.ElementKind.LIBRARY,
-          directive.prefix,
-          NO_RETURN_TYPE,
-          false,
-          false);
-    }
-  }
-
   void _addLocalVarSuggestion(SimpleIdentifier id, TypeName returnType) {
     CompletionSuggestion suggestion =
         _addSuggestion(id, CompletionSuggestionKind.LOCAL_VARIABLE, returnType, null);
     if (suggestion != null) {
       suggestion.element = _createElement(
           protocol.ElementKind.LOCAL_VARIABLE,
           id,
           returnType,
           false,
           false);
@@ skipping 158 matching lines @@
     if (name == null || name.length <= 0) {
       return DYNAMIC;
     }
     TypeArgumentList typeArgs = type.typeArguments;
     if (typeArgs != null) {
       //TODO (danrubel) include type arguments
     }
     return name;
   }
 }