Unite processing of all simple commands in command-line debugger.

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");
 
@@ skipping 50 matching lines @@
 }
 
 
 void processCommand(String cmdLine) {
   seqNum++;
   var args = cmdLine.split(' ');
   if (args.length == 0) {
     return;
   }
   var command = args[0];
-  if (command == "r") {
-    var cmd = { "id": seqNum, "command": "resume" };
-    sendCmd(cmd).then((result) => handleGenericResponse(result));
-    stackTrace = curFrame = null;
-  } else if (command == "s") {
-    var cmd = { "id": seqNum, "command": "stepOver" };
-    sendCmd(cmd).then((result) => handleGenericResponse(result));
-    stackTrace = curFrame = null;
-  } else if (command == "si") {
-    var cmd = { "id": seqNum, "command": "stepInto" };
-    sendCmd(cmd).then((result) => handleGenericResponse(result));
-    stackTrace = curFrame = null;
-  } else if (command == "so") {
-    var cmd = { "id": seqNum, "command": "stepOut" };
+  var simple_commands =
+      { 'r':'resume', 's':'stepOver', 'si':'stepInto', 'so':'stepOut'};
+  if (simple_commands[command] != null) {
+    var cmd = { "id": seqNum, "command": simple_commands[command]};
     sendCmd(cmd).then((result) => handleGenericResponse(result));
     stackTrace = curFrame = null;
   } else if (command == "bt") {
     var cmd = { "id": seqNum, "command": "getStackTrace" };
     sendCmd(cmd).then((result) => handleStackTraceResponse(result));
   } else if (command == "ll") {
     var cmd = { "id": seqNum, "command": "getLibraryURLs" };
     sendCmd(cmd).then((result) => handleGetLibraryResponse(result));
   } else if (command == "sbp" && args.length >= 2) {
     var url, line;
@@ skipping 222 matching lines @@
   };
   vmInStream.onError = (err) {
     print("Error in debug connection: $err");
     quitShell();
   };
   vmInStream.onClosed = () {
     print("VM debugger connection closed");
     quitShell();
   };
 }