| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| <link rel="import" href="/base/base.html"> |
| <script> |
| 'use strict'; |
| |
| /** |
| * @fileoverview Helper code for working with tracing categories. |
| * |
| */ |
| tr.exportTo('tr.b', function() { |
| |
| // Cached values for getCategoryParts. |
| var categoryPartsFor = {}; |
| |
| /** |
| * Categories are stored in comma-separated form, e.g: 'a,b' meaning |
| * that the event is part of the a and b category. |
| * |
| * This function returns the category split by string, caching the |
| * array for performance. |
| * |
| * Do not mutate the returned array!!!! |
| */ |
| function getCategoryParts(category) { |
| var parts = categoryPartsFor[category]; |
| if (parts !== undefined) |
| return parts; |
| parts = category.split(','); |
| categoryPartsFor[category] = parts; |
| return parts; |
| } |
| |
| return { |
| getCategoryParts: getCategoryParts |
| }; |
| }); |
| </script> |
