Initial implementation of copy/paste support

pkg/analysis_server/lib/src/edit/edit_domain.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.
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/plugin/edit/assist/assist_dart.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
 import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/collections.dart';
+import 'package:analysis_server/src/computer/import_elements_computer.dart';
 import 'package:analysis_server/src/domain_abstract.dart';
 import 'package:analysis_server/src/plugin/plugin_manager.dart';
 import 'package:analysis_server/src/plugin/result_converter.dart';
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
 import 'package:analysis_server/src/services/completion/postfix/postfix_completion.dart';
 import 'package:analysis_server/src/services/completion/statement/statement_completion.dart';
 import 'package:analysis_server/src/services/correction/assist_internal.dart';
 import 'package:analysis_server/src/services/correction/fix_internal.dart';
 import 'package:analysis_server/src/services/correction/organize_directives.dart';
 import 'package:analysis_server/src/services/correction/sort_members.dart';
@@ skipping 319 matching lines @@
       } else if (requestName == EDIT_REQUEST_GET_ASSISTS) {
         getAssists(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_GET_AVAILABLE_REFACTORINGS) {
         return _getAvailableRefactorings(request);
       } else if (requestName == EDIT_REQUEST_GET_FIXES) {
         getFixes(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_GET_REFACTORING) {
         return _getRefactoring(request);
+      } else if (requestName == EDIT_REQUEST_IMPORT_ELEMENTS) {
+        importElements(request);
+        return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_ORGANIZE_DIRECTIVES) {
         organizeDirectives(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_SORT_MEMBERS) {
         sortMembers(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_GET_STATEMENT_COMPLETION) {
         getStatementCompletion(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_IS_POSTFIX_COMPLETION_APPLICABLE) {
         isPostfixCompletionApplicable(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName == EDIT_REQUEST_GET_POSTFIX_COMPLETION) {
         getPostfixCompletion(request);
         return Response.DELAYED_RESPONSE;
       } else if (requestName ==
           EDIT_REQUEST_LIST_POSTFIX_COMPLETION_TEMPLATES) {
         listPostfixCompletionTemplates(request);
         return Response.DELAYED_RESPONSE;
       }
     } on RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
 
+  /**
+   * Implement the `edit.importElements` request.
+   */
+  Future<Null> importElements(Request request) async {
+    EditImportElementsParams params =
+        new EditImportElementsParams.fromRequest(request);
+    //
+    // Prepare the resolved unit.
+    //
+    AnalysisResult result = await server.getAnalysisResult(params.file);
+    if (result == null) {
+      server.sendResponse(new Response.importElementsInvalidFile(request));
+    }
+    //
+    // Compute the edits required to import the required elements.
+    //
+    List<SourceEdit> edits =
+        new ImportElementsComputer(result, params.file, params.elements)
+            .compute();
+    //
+    // Send the response.
+    //
+    server.sendResponse(
+        new EditImportElementsResult(edits).toResponse(request.id));
+  }
+
   Future isPostfixCompletionApplicable(Request request) async {
     var params = new EditGetPostfixCompletionParams.fromRequest(request);
     bool value = false;
 
     AnalysisResult result = await server.getAnalysisResult(params.file);
     if (result != null) {
       CompilationUnit unit = result.unit;
       CompilationUnitElement unitElement =
           resolutionMap.elementDeclaredByCompilationUnit(unit);
       if (unitElement.context != null) {
@@ skipping 634 matching lines @@
     }
     return new RefactoringStatus();
   }
 }
 
 /**
  * [_RefactoringManager] throws instances of this class internally to stop
  * processing in a manager that was reset.
  */
 class _ResetError {}