| // Copyright (c) 2015, 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. |
| |
| import 'dart:math' as math; |
| |
| import 'package:dart_messages/shared_messages.dart' as shared_messages; |
| |
| math.Random random = new math.Random(); |
| |
| const idLength = 6; |
| final $A = "A".codeUnitAt(0); |
| final $Z = "Z".codeUnitAt(0); |
| |
| String computeId() { |
| List<int> charCodes = []; |
| for (int i = 0; i < idLength; i++) { |
| charCodes.add($A + random.nextInt($Z - $A)); |
| } |
| return new String.fromCharCodes(charCodes); |
| } |
| |
| /// Computes a random message ID that hasn't been used before. |
| void main() { |
| var usedIds = |
| shared_messages.MESSAGES.values.map((entry) => entry.id).toSet(); |
| |
| print("${usedIds.length} existing ids"); |
| |
| var newId; |
| do { |
| newId = computeId(); |
| } while (usedIds.contains(newId)); |
| print("Available id: $newId"); |
| } |