diff options
Diffstat (limited to 'contexts/data/lib/closure-library/closure/goog/locale/timezonedetection.js')
-rw-r--r-- | contexts/data/lib/closure-library/closure/goog/locale/timezonedetection.js | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/contexts/data/lib/closure-library/closure/goog/locale/timezonedetection.js b/contexts/data/lib/closure-library/closure/goog/locale/timezonedetection.js deleted file mode 100644 index 6723fd0..0000000 --- a/contexts/data/lib/closure-library/closure/goog/locale/timezonedetection.js +++ /dev/null @@ -1,117 +0,0 @@ -// Copyright 2008 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 Functions for detecting user's time zone. - * This work is based on Charlie Luo and Hong Yan's time zone detection work - * for CBG. - */ -goog.provide('goog.locale.timeZoneDetection'); - -goog.require('goog.locale'); -goog.require('goog.locale.TimeZoneFingerprint'); - - -/** - * Array of time instances for checking the time zone offset. - * @type {Array.<number>} - * @private - */ -goog.locale.timeZoneDetection.TZ_POKE_POINTS_ = [ - 1109635200, 1128902400, 1130657000, 1143333000, 1143806400, 1145000000, - 1146380000, 1152489600, 1159800000, 1159500000, 1162095000, 1162075000, - 1162105500]; - - -/** - * Calculates time zone fingerprint by poking time zone offsets for 13 - * preselected time points. - * See {@link goog.locale.timeZoneDetection.TZ_POKE_POINTS_} - * @param {Date} date Date for calculating the fingerprint. - * @return {number} Fingerprint of user's time zone setting. - */ -goog.locale.timeZoneDetection.getFingerprint = function(date) { - var hash = 0; - var stdOffset; - var isComplex = false; - for (var i = 0; - i < goog.locale.timeZoneDetection.TZ_POKE_POINTS_.length; i++) { - date.setTime(goog.locale.timeZoneDetection.TZ_POKE_POINTS_[i] * 1000); - var offset = date.getTimezoneOffset() / 30 + 48; - if (i == 0) { - stdOffset = offset; - } else if (stdOffset != offset) { - isComplex = true; - } - hash = (hash << 2) ^ offset; - } - return isComplex ? hash : /** @type {number} */ (stdOffset); -}; - - -/** - * Detects browser's time zone setting. If user's country is known, a better - * time zone choice could be guessed. - * @param {string=} opt_country Two-letter ISO 3166 country code. - * @param {Date=} opt_date Date for calculating the fingerprint. Defaults to the - * current date. - * @return {string} Time zone ID of best guess. - */ -goog.locale.timeZoneDetection.detectTimeZone = function(opt_country, opt_date) { - var date = opt_date || new Date(); - var fingerprint = goog.locale.timeZoneDetection.getFingerprint(date); - var timeZoneList = goog.locale.TimeZoneFingerprint[fingerprint]; - // Timezones in goog.locale.TimeZoneDetection.TimeZoneMap are in the format - // US-America/Los_Angeles. Country code needs to be stripped before a - // timezone is returned. - if (timeZoneList) { - if (opt_country) { - for (var i = 0; i < timeZoneList.length; ++i) { - if (timeZoneList[i].indexOf(opt_country) == 0) { - return timeZoneList[i].substring(3); - } - } - } - return timeZoneList[0].substring(3); - } - return ''; -}; - - -/** - * Returns an array of time zones that are consistent with user's platform - * setting. If user's country is given, only the time zone for that country is - * returned. - * @param {string=} opt_country 2 letter ISO 3166 country code. Helps in making - * a better guess for user's time zone. - * @param {Date=} opt_date Date for retrieving timezone list. Defaults to the - * current date. - * @return {Array.<string>} Array of time zone IDs. - */ -goog.locale.timeZoneDetection.getTimeZoneList = function(opt_country, - opt_date) { - var date = opt_date || new Date(); - var fingerprint = goog.locale.timeZoneDetection.getFingerprint(date); - var timeZoneList = goog.locale.TimeZoneFingerprint[fingerprint]; - if (!timeZoneList) { - return []; - } - var chosenList = []; - for (var i = 0; i < timeZoneList.length; i++) { - if (!opt_country || timeZoneList[i].indexOf(opt_country) == 0) { - chosenList.push(timeZoneList[i].substring(3)); - } - } - return chosenList; -}; |