Allow print() to be used for debugging analysis server.

pkg/analysis_server/lib/src/get_handler.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 get.handler;
 
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analysis_server/src/socket_server.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 
 /**
  * Instances of the class [GetHandler] handle GET requests.
  */
 class GetHandler {
   /**
    * The path used to request the status of the analysis server as a whole.
    */
   static const String STATUS_PATH = '/status';
 
   /**
    * The socket server whose status is to be reported on.
    */
   SocketServer _server;
 
   /**
+   * Buffer containing strings printed by the analysis server.
+   */
+  List<String> _printBuffer;
+
+  /**
    * Initialize a newly created handler for GET requests.
    */
-  GetHandler(SocketServer this._server);
+  GetHandler(this._server, this._printBuffer);
 
   /**
    * Handle a GET request received by the HTTP server.
    */
   void handleGetRequest(HttpRequest request) {
     String path = request.uri.path;
     if (path == STATUS_PATH) {
       _returnServerStatus(request);
     } else {
       _returnUnknownRequest(request);
@@ skipping 70 matching lines @@
         response.write('</table>');
         List<CaughtException> exceptions = statistics.exceptions;
         if (!exceptions.isEmpty) {
           response.write('<h2>Exceptions</h2>');
           exceptions.forEach((CaughtException exception) {
             response.write('<p>${exception.exception}</p>');
           });
         }
       });
     }
+    response.write('<h1>Most recent strings printed by analysis server</h2>');
+    response.write('<pre>');
+    response.write(HTML_ESCAPE.convert(_printBuffer.join('\n')));
+    response.write('</pre>');
     response.write('</body>');
     response.write('</html>');
     response.close();
   }
 
   /**
    * Return an error in response to an unrecognized request received by the HTTP
    * server.
    */
   void _returnUnknownRequest(HttpRequest request) {
@@ skipping 20 matching lines @@
       response.write(value);
       if (header) {
         response.write('</th>');
       } else {
         response.write('</td>');
       }
     });
     response.write('</tr>');
   }
 }