Create a public API for contributing fixes and make fixes pluggable

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.
 
 library edit.domain;
 
 import 'dart:async';
 
+import 'package:analysis_server/edit/fix/fix_core.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/collections.dart';
 import 'package:analysis_server/src/constants.dart';
+import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/protocol_server.dart' hide Element;
 import 'package:analysis_server/src/services/correction/assist.dart';
 import 'package:analysis_server/src/services/correction/fix.dart';
 import 'package:analysis_server/src/services/correction/sort_members.dart';
 import 'package:analysis_server/src/services/correction/status.dart';
 import 'package:analysis_server/src/services/refactoring/refactoring.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart' as engine;
@@ skipping 11 matching lines @@
  * Instances of the class [EditDomainHandler] implement a [RequestHandler]
  * that handles requests in the edit domain.
  */
 class EditDomainHandler implements RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
    */
   final AnalysisServer server;
 
   /**
+   * The server plugin that defines the extension points used by this handler.
+   */
+  final ServerPlugin plugin;
+
+  /**
    * The [SearchEngine] for this server.
    */
   SearchEngine searchEngine;
 
   _RefactoringManager refactoringManager;
 
   /**
    * Initialize a newly created handler to handle requests for the given [server].
    */
-  EditDomainHandler(this.server) {
+  EditDomainHandler(this.server, this.plugin) {
     searchEngine = server.searchEngine;
     _newRefactoringManager();
   }
 
   Response format(Request request) {
     EditFormatParams params = new EditFormatParams.fromRequest(request);
     String file = params.file;
 
     ContextSourcePair contextSource = server.getContextSourcePair(file);
 
@@ skipping 67 matching lines @@
     List<AnalysisErrorFixes> errorFixesList = <AnalysisErrorFixes>[];
     List<CompilationUnit> units = server.getResolvedCompilationUnits(file);
     for (CompilationUnit unit in units) {
       engine.AnalysisErrorInfo errorInfo = server.getErrors(file);
       if (errorInfo != null) {
         LineInfo lineInfo = errorInfo.lineInfo;
         int requestLine = lineInfo.getLocation(offset).lineNumber;
         for (engine.AnalysisError error in errorInfo.errors) {
           int errorLine = lineInfo.getLocation(error.offset).lineNumber;
           if (errorLine == requestLine) {
-            List<Fix> fixes = computeFixes(unit, error);
+            List<Fix> fixes = computeFixes(plugin, unit.element.context, error);
             if (fixes.isNotEmpty) {
               AnalysisError serverError =
                   newAnalysisError_fromEngine(lineInfo, error);
               AnalysisErrorFixes errorFixes =
                   new AnalysisErrorFixes(serverError);
               errorFixesList.add(errorFixes);
               fixes.forEach((fix) {
                 errorFixes.fixes.add(fix.change);
               });
             }
@@ skipping 474 matching lines @@
     }
     if (refactoring is RenameRefactoring) {
       RenameRefactoring renameRefactoring = refactoring;
       RenameOptions renameOptions = params.options;
       renameRefactoring.newName = renameOptions.newName;
       return renameRefactoring.checkNewName();
     }
     return new RefactoringStatus();
   }
 }