1 | // Copyright 2013 The Closure Library Authors. All Rights Reserved. |
2 | // |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
4 | // you may not use this file except in compliance with the License. |
5 | // You may obtain a copy of the License at |
6 | // |
7 | // http://www.apache.org/licenses/LICENSE-2.0 |
8 | // |
9 | // Unless required by applicable law or agreed to in writing, software |
10 | // distributed under the License is distributed on an "AS-IS" BASIS, |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | // See the License for the specific language governing permissions and |
13 | // limitations under the License. |
14 | |
15 | /** |
16 | * @fileoverview Closure user agent detection. |
17 | * @see http://en.wikipedia.org/wiki/User_agent |
18 | * For more information on browser brand, platform, or device see the other |
19 | * sub-namespaces in goog.labs.userAgent (browser, platform, and device). |
20 | * |
21 | */ |
22 | |
23 | goog.provide('goog.labs.userAgent.engine'); |
24 | |
25 | goog.require('goog.array'); |
26 | goog.require('goog.labs.userAgent.util'); |
27 | goog.require('goog.string'); |
28 | |
29 | |
30 | /** |
31 | * @return {boolean} Whether the rendering engine is Presto. |
32 | */ |
33 | goog.labs.userAgent.engine.isPresto = function() { |
34 | return goog.labs.userAgent.util.matchUserAgent('Presto'); |
35 | }; |
36 | |
37 | |
38 | /** |
39 | * @return {boolean} Whether the rendering engine is Trident. |
40 | */ |
41 | goog.labs.userAgent.engine.isTrident = function() { |
42 | // IE only started including the Trident token in IE8. |
43 | return goog.labs.userAgent.util.matchUserAgent('Trident') || |
44 | goog.labs.userAgent.util.matchUserAgent('MSIE'); |
45 | }; |
46 | |
47 | |
48 | /** |
49 | * @return {boolean} Whether the rendering engine is WebKit. |
50 | */ |
51 | goog.labs.userAgent.engine.isWebKit = function() { |
52 | return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit'); |
53 | }; |
54 | |
55 | |
56 | /** |
57 | * @return {boolean} Whether the rendering engine is Gecko. |
58 | */ |
59 | goog.labs.userAgent.engine.isGecko = function() { |
60 | return goog.labs.userAgent.util.matchUserAgent('Gecko') && |
61 | !goog.labs.userAgent.engine.isWebKit() && |
62 | !goog.labs.userAgent.engine.isTrident(); |
63 | }; |
64 | |
65 | |
66 | /** |
67 | * @return {string} The rendering engine's version or empty string if version |
68 | * can't be determined. |
69 | */ |
70 | goog.labs.userAgent.engine.getVersion = function() { |
71 | var userAgentString = goog.labs.userAgent.util.getUserAgent(); |
72 | if (userAgentString) { |
73 | var tuples = goog.labs.userAgent.util.extractVersionTuples( |
74 | userAgentString); |
75 | |
76 | var engineTuple = tuples[1]; |
77 | if (engineTuple) { |
78 | // In Gecko, the version string is either in the browser info or the |
79 | // Firefox version. See Gecko user agent string reference: |
80 | // http://goo.gl/mULqa |
81 | if (engineTuple[0] == 'Gecko') { |
82 | return goog.labs.userAgent.engine.getVersionForKey_( |
83 | tuples, 'Firefox'); |
84 | } |
85 | |
86 | return engineTuple[1]; |
87 | } |
88 | |
89 | // IE has only one version identifier, and the Trident version is |
90 | // specified in the parenthetical. |
91 | var browserTuple = tuples[0]; |
92 | var info; |
93 | if (browserTuple && (info = browserTuple[2])) { |
94 | var match = /Trident\/([^\s;]+)/.exec(info); |
95 | if (match) { |
96 | return match[1]; |
97 | } |
98 | } |
99 | } |
100 | return ''; |
101 | }; |
102 | |
103 | |
104 | /** |
105 | * @param {string|number} version The version to check. |
106 | * @return {boolean} Whether the rendering engine version is higher or the same |
107 | * as the given version. |
108 | */ |
109 | goog.labs.userAgent.engine.isVersionOrHigher = function(version) { |
110 | return goog.string.compareVersions(goog.labs.userAgent.engine.getVersion(), |
111 | version) >= 0; |
112 | }; |
113 | |
114 | |
115 | /** |
116 | * @param {!Array.<!Array.<string>>} tuples Version tuples. |
117 | * @param {string} key The key to look for. |
118 | * @return {string} The version string of the given key, if present. |
119 | * Otherwise, the empty string. |
120 | * @private |
121 | */ |
122 | goog.labs.userAgent.engine.getVersionForKey_ = function(tuples, key) { |
123 | // TODO(nnaze): Move to util if useful elsewhere. |
124 | |
125 | var pair = goog.array.find(tuples, function(pair) { |
126 | return key == pair[0]; |
127 | }); |
128 | |
129 | return pair && pair[1] || ''; |
130 | }; |