| // 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 Closure user agent detection. |
| * @see http://en.wikipedia.org/wiki/User_agent |
| * For more information on browser brand, platform, or device see the other |
| * sub-namespaces in goog.labs.userAgent (browser, platform, and device). |
| * |
| */ |
| |
| goog.provide('goog.labs.userAgent.engine'); |
| |
| goog.require('goog.array'); |
| goog.require('goog.labs.userAgent.util'); |
| goog.require('goog.string'); |
| |
| |
| /** |
| * @return {boolean} Whether the rendering engine is Presto. |
| */ |
| goog.labs.userAgent.engine.isPresto = function() { |
| return goog.labs.userAgent.util.matchUserAgent('Presto'); |
| }; |
| |
| |
| /** |
| * @return {boolean} Whether the rendering engine is Trident. |
| */ |
| goog.labs.userAgent.engine.isTrident = function() { |
| // IE only started including the Trident token in IE8. |
| return goog.labs.userAgent.util.matchUserAgent('Trident') || |
| goog.labs.userAgent.util.matchUserAgent('MSIE'); |
| }; |
| |
| |
| /** |
| * @return {boolean} Whether the rendering engine is WebKit. |
| */ |
| goog.labs.userAgent.engine.isWebKit = function() { |
| return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit'); |
| }; |
| |
| |
| /** |
| * @return {boolean} Whether the rendering engine is Gecko. |
| */ |
| goog.labs.userAgent.engine.isGecko = function() { |
| return goog.labs.userAgent.util.matchUserAgent('Gecko') && |
| !goog.labs.userAgent.engine.isWebKit() && |
| !goog.labs.userAgent.engine.isTrident(); |
| }; |
| |
| |
| /** |
| * @return {string} The rendering engine's version or empty string if version |
| * can't be determined. |
| */ |
| goog.labs.userAgent.engine.getVersion = function() { |
| var userAgentString = goog.labs.userAgent.util.getUserAgent(); |
| if (userAgentString) { |
| var tuples = goog.labs.userAgent.util.extractVersionTuples( |
| userAgentString); |
| |
| var engineTuple = tuples[1]; |
| if (engineTuple) { |
| // In Gecko, the version string is either in the browser info or the |
| // Firefox version. See Gecko user agent string reference: |
| // http://goo.gl/mULqa |
| if (engineTuple[0] == 'Gecko') { |
| return goog.labs.userAgent.engine.getVersionForKey_( |
| tuples, 'Firefox'); |
| } |
| |
| return engineTuple[1]; |
| } |
| |
| // IE has only one version identifier, and the Trident version is |
| // specified in the parenthetical. |
| var browserTuple = tuples[0]; |
| var info; |
| if (browserTuple && (info = browserTuple[2])) { |
| var match = /Trident\/([^\s;]+)/.exec(info); |
| if (match) { |
| return match[1]; |
| } |
| } |
| } |
| return ''; |
| }; |
| |
| |
| /** |
| * @param {string|number} version The version to check. |
| * @return {boolean} Whether the rendering engine version is higher or the same |
| * as the given version. |
| */ |
| goog.labs.userAgent.engine.isVersionOrHigher = function(version) { |
| return goog.string.compareVersions(goog.labs.userAgent.engine.getVersion(), |
| version) >= 0; |
| }; |
| |
| |
| /** |
| * @param {!Array<!Array<string>>} tuples Version tuples. |
| * @param {string} key The key to look for. |
| * @return {string} The version string of the given key, if present. |
| * Otherwise, the empty string. |
| * @private |
| */ |
| goog.labs.userAgent.engine.getVersionForKey_ = function(tuples, key) { |
| // TODO(nnaze): Move to util if useful elsewhere. |
| |
| var pair = goog.array.find(tuples, function(pair) { |
| return key == pair[0]; |
| }); |
| |
| return pair && pair[1] || ''; |
| }; |