Guard against files that are not being analyzed (issue 29493)

pkg/analysis_server/lib/src/domain_completion.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 domain.completion;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 65 matching lines @@
       CompletionGetSuggestionsParams params) async {
     //
     // Allow plugins to start computing fixes.
     //
     Map<PluginInfo, Future<plugin.Response>> pluginFutures;
     plugin.CompletionGetSuggestionsParams requestParams;
     if (server.options.enableNewAnalysisDriver) {
       String file = params.file;
       int offset = params.offset;
       AnalysisDriver driver = server.getAnalysisDriver(file);
-      requestParams = new plugin.CompletionGetSuggestionsParams(file, offset);
-      pluginFutures = server.pluginManager
-          .broadcastRequest(requestParams, contextRoot: driver.contextRoot);
+      if (driver != null) {
+        requestParams = new plugin.CompletionGetSuggestionsParams(file, offset);
+        pluginFutures = server.pluginManager
+            .broadcastRequest(requestParams, contextRoot: driver.contextRoot);
+      }
     }
     //
     // Compute completions generated by server.
     //
     Iterable<CompletionContributor> newContributors =
         server.serverPlugin.completionContributors;
     List<CompletionSuggestion> suggestions = <CompletionSuggestion>[];
 
     const COMPUTE_SUGGESTIONS_TAG = 'computeSuggestions';
     performance.logStartTime(COMPUTE_SUGGESTIONS_TAG);
@@ skipping 48 matching lines @@
       }
       return null;
     }, onError: (exception, stackTrace) {
       server.sendServerErrorNotification(
           'Failed to handle completion domain request: ${request.toJson()}',
           exception,
           stackTrace);
     });
   }
 
+  void ifMatchesRequestClear(CompletionRequest completionRequest) {
+    if (_currentRequest == completionRequest) {
+      _currentRequest = null;
+    }
+  }
+
   /**
    * Process a `completion.getSuggestions` request.
    */
   Future<Null> processRequest(Request request) async {
     performance = new CompletionPerformance();
 
     // extract and validate params
     CompletionGetSuggestionsParams params =
         new CompletionGetSuggestionsParams.fromRequest(request);
 
@@ skipping 79 matching lines @@
       performance.notificationCount = 1;
       performance.logFirstNotificationComplete('notification 1 complete');
       performance.suggestionCountFirst = result.suggestions.length;
       performance.suggestionCountLast = result.suggestions.length;
       performance.complete();
     }).whenComplete(() {
       ifMatchesRequestClear(completionRequest);
     });
   }
 
-  void setNewRequest(CompletionRequest completionRequest) {
-    _abortCurrentRequest();
-    _currentRequest = completionRequest;
-  }
-
-  void ifMatchesRequestClear(CompletionRequest completionRequest) {
-    if (_currentRequest == completionRequest) {
-      _currentRequest = null;
-    }
-  }
-
   /**
    * If tracking code completion performance over time, then
    * record addition information about the request in the performance record.
    */
   void recordRequest(CompletionPerformance performance, AnalysisContext context,
       Source source, int offset) {
     performance.source = source;
     if (performanceListMaxLength == 0 || context == null || source == null) {
       return;
     }
@@ skipping 11 matching lines @@
   /**
    * Send completion notification results.
    */
   void sendCompletionNotification(String completionId, int replacementOffset,
       int replacementLength, Iterable<CompletionSuggestion> results) {
     server.sendNotification(new CompletionResultsParams(
             completionId, replacementOffset, replacementLength, results, true)
         .toNotification());
   }
 
+  void setNewRequest(CompletionRequest completionRequest) {
+    _abortCurrentRequest();
+    _currentRequest = completionRequest;
+  }
+
   /**
    * Abort the current completion request, if any.
    */
   void _abortCurrentRequest() {
     if (_currentRequest != null) {
       _currentRequest.abort();
       _currentRequest = null;
     }
   }
 }
@@ skipping 18 matching lines @@
   final int replacementOffset;
 
   /**
    * The suggested completions.
    */
   final List<CompletionSuggestion> suggestions;
 
   CompletionResult(
       this.replacementOffset, this.replacementLength, this.suggestions);
 }