| // Copyright 2013 The Closure Library Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS-IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| |
| /** |
| * @fileoverview Contains helper functions for performing locale-sensitive |
| * collation. |
| */ |
| |
| |
| goog.provide('goog.i18n.collation'); |
| |
| |
| /** |
| * Returns the comparator for a locale. If a locale is not explicitly specified, |
| * a comparator for the user's locale will be returned. Note that if the browser |
| * does not support locale-sensitive string comparisons, the comparator returned |
| * will be a simple codepoint comparator. |
| * |
| * @param {string=} opt_locale the locale that the comparator is used for. |
| * @return {function(string, string): number} The locale-specific comparator. |
| */ |
| goog.i18n.collation.createComparator = function(opt_locale) { |
| // See http://code.google.com/p/v8-i18n. |
| if (goog.i18n.collation.hasNativeComparator()) { |
| var intl = goog.global.Intl; |
| return new intl.Collator([opt_locale || goog.LOCALE]).compare; |
| } else { |
| return function(arg1, arg2) { |
| return arg1.localeCompare(arg2); |
| }; |
| } |
| }; |
| |
| |
| /** |
| * Returns true if a locale-sensitive comparator is available for a locale. If |
| * a locale is not explicitly specified, the user's locale is used instead. |
| * |
| * @param {string=} opt_locale The locale to be checked. |
| * @return {boolean} Whether there is a locale-sensitive comparator available |
| * for the locale. |
| */ |
| goog.i18n.collation.hasNativeComparator = function(opt_locale) { |
| var intl = goog.global.Intl; |
| return !!(intl && intl.Collator); |
| }; |