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

pkg/analysis_server/lib/http_server.dart

Index: pkg/analysis_server/lib/http_server.dart
diff --git a/pkg/analysis_server/lib/http_server.dart b/pkg/analysis_server/lib/http_server.dart
index 1fbd0afcc4ed25f1b8488efd2636c720a4ad78b7..a56cd507166cc326f04c8a603b29fa8dee89ca56 100644
--- a/pkg/analysis_server/lib/http_server.dart
+++ b/pkg/analysis_server/lib/http_server.dart
@@ -18,6 +18,11 @@ import 'package:analysis_server/src/socket_server.dart';
  */
 class HttpAnalysisServer {
   /**
+   * Number of lines of print output to capture.
+   */
+  static const int PRINT_BUFFER_LENGTH = 1000;

[danrubel, 2014/10/28 21:01:02]

MAX_PRINT_BUFFER_MAX_LENGTH ?

[Paul Berry, 2014/10/28 23:29:13]

Done.

+
+  /**
    * An object that can handle either a WebSocket connection or a connection
    * to the client over stdio.
    */
@@ -39,6 +44,11 @@ class HttpAnalysisServer {
   Future<HttpServer> _server;
 
   /**
+   * Last PRINT_BUFFER_LENGTH lines printed.
+   */
+  List<String> _printBuffer = <String>[];
+
+  /**
    * Attach a listener to a newly created HTTP server.
    */
   void _handleServer(HttpServer httServer) {
@@ -61,7 +71,7 @@ class HttpAnalysisServer {
    */
   void _handleGetRequest(HttpRequest request) {
     if (getHandler == null) {
-      getHandler = new GetHandler(socketServer);
+      getHandler = new GetHandler(socketServer, _printBuffer);
     }
     getHandler.handleGetRequest(request);
   }
@@ -99,4 +109,14 @@ class HttpAnalysisServer {
       server.close();
     });
   }
+
+  /**
+   * Record that the given line was printed out by the analysis server.
+   */
+  void recordPrint(String line) {
+    _printBuffer.add(line);
+    if (_printBuffer.length > PRINT_BUFFER_LENGTH) {
+      _printBuffer.removeRange(0, _printBuffer.length - PRINT_BUFFER_LENGTH);
+    }
+  }
 }