Evaluate expression in context of an object

tools/ddbg.dart

 // Copyright (c) 2012, 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.
 
 // Simple interactive debugger shell that connects to the Dart VM's debugger
 // connection port.
 
 import "dart:io";
 import "dart:json" as json;
 import "dart:utf";
@@ skipping 20 matching lines @@
   print("""
   q   Quit debugger shell
   bt  Show backtrace
   r   Resume execution
   s   Single step
   so  Step over
   si  Step into
   sbp [<file>] <line> Set breakpoint
   rbp <id> Remove breakpoint with given id
   po <id> Print object info for given id
+  eval <id> <expr> Evaluate expr on object id
   pl <id> <idx> [<len>] Print list element/slice
   pc <id> Print class info for given id
   ll  List loaded libraries
   plib <id> Print library info for given library id
   slib <id> <true|false> Set library id debuggable
   pg <id> Print all global variables visible within given library id
   ls <lib_id> List loaded scripts in library
   gs <lib_id> <script_url> Get source text of script in library
   tok <lib_id> <script_url> Get line and token table of script in library
   epi <none|all|unhandled>  Set exception pause info
@@ skipping 68 matching lines @@
                 "command": "removeBreakpoint",
                 "params": { "isolateId" : isolate_id,
                             "breakpointId": int.parse(args[1]) } };
     sendCmd(cmd).then((result) => handleGenericResponse(result));
   } else if (command == "ls" && args.length == 2) {
     var cmd = { "id": seqNum,
                 "command": "getScriptURLs",
                 "params": { "isolateId" : isolate_id,
                             "libraryId": int.parse(args[1]) } };
     sendCmd(cmd).then((result) => handleGetScriptsResponse(result));
+  } else if (command == "eval" && args.length > 2) {
+    var expr = args.getRange(2, args.length).join(" ");
+    var cmd = { "id": seqNum,
+                "command": "evaluateExpr",
+                "params": { "isolateId": isolate_id,
+                            "objectId": int.parse(args[1]),
+                            "expression": expr } };
+    sendCmd(cmd).then((result) => handleEvalResponse(result));
   } else if (command == "po" && args.length == 2) {
     var cmd = { "id": seqNum,
                 "command": "getObjectProperties",
                 "params": { "isolateId" : isolate_id,
                             "objectId": int.parse(args[1]) } };
     sendCmd(cmd).then((result) => handleGetObjPropsResponse(result));
   } else if (command == "pl" && args.length >= 3) {
      var cmd;
      if (args.length == 3) {
        cmd = { "id": seqNum,
@@ skipping 222 matching lines @@
 void handleGetScriptsResponse(response) {
   Map result = response["result"];
   List urls = result["urls"];
   print("Loaded scripts:");
   for (int i = 0; i < urls.length; i++) {
     print("  $i ${urls[i]}");
   }
 }
 
 
+void handleEvalResponse(response) {
+  Map result = response["result"];
+  print(remoteObject(result));
+}
+
+
 void handleSetBpResponse(response) {
   Map result = response["result"];
   var id = result["breakpointId"];
   assert(id != null);
   print("Set BP $id");
 }
 
 
 void handleGenericResponse(response) {
   if (response["error"] != null) {
@@ skipping 223 matching lines @@
       process.stdin.close();
       process.exitCode.then((int exitCode) {
         print('${arguments.join(" ")} exited with $exitCode');
       });
       debuggerMain();
     });
   } else {
     debuggerMain();
   }
 }