Guard analysis server's getAnalysisResult, must be dart

pkg/analysis_server/lib/src/analysis_server.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 analysis.server;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:core';
 import 'dart:io' as io;
@@ skipping 644 matching lines @@
     }
     return null;
   }
 
   /**
    * Return the analysis result for the file with the given [path]. The file is
    * analyzed in one of the analysis drivers to which the file was added,
    * otherwise in the first driver, otherwise `null` is returned.
    */
   Future<nd.AnalysisResult> getAnalysisResult(String path) async {
+    if (!AnalysisEngine.isDartFileName(path)) {
+      return null;
+    }
+
     try {
       nd.AnalysisDriver driver = getAnalysisDriver(path);
       return await driver?.getResult(path);
     } catch (e) {
       // Ignore the exception.
       // We don't want to log the same exception again and again.
       return null;
     }
   }
 
@@ skipping 1620 matching lines @@
   /**
    * The [PerformanceTag] for time spent in server request handlers.
    */
   static PerformanceTag serverRequests = new PerformanceTag('serverRequests');
 
   /**
    * The [PerformanceTag] for time spent in split store microtasks.
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }