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// 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 Edge.
*/
goog.labs.userAgent.engine.isEdge = function() {
return goog.labs.userAgent.util.matchUserAgent('Edge');
};
/**
* @return {boolean} Whether the rendering engine is WebKit.
*/
goog.labs.userAgent.engine.isWebKit = function() {
return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit') &&
!goog.labs.userAgent.engine.isEdge();
};
/**
* @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() &&
!goog.labs.userAgent.engine.isEdge();
};
/**
* @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 = goog.labs.userAgent.engine.getEngineTuple_(tuples);
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];
}
// MSIE has only one version identifier, and the Trident version is
// specified in the parenthetical. IE Edge is covered in the engine tuple
// detection.
var browserTuple = tuples[0];
var info;
if (browserTuple && (info = browserTuple[2])) {
var match = /Trident\/([^\s;]+)/.exec(info);
if (match) {
return match[1];
}
}
}
return '';
};
/**
* @param {!Array<!Array<string>>} tuples Extracted version tuples.
* @return {!Array<string>|undefined} The engine tuple or undefined if not
* found.
* @private
*/
goog.labs.userAgent.engine.getEngineTuple_ = function(tuples) {
if (!goog.labs.userAgent.engine.isEdge()) {
return tuples[1];
}
for (var i = 0; i < tuples.length; i++) {
var tuple = tuples[i];
if (tuple[0] == 'Edge') {
return tuple;
}
}
};
/**
* @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] || '';
};
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