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// Copyright 2016 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 Methods to verify IE versions.
* TODO(johnlenz): delete this remove this file on the experiment is complete.
*/
goog.provide('goog.labs.useragent.verifier');
/** @const */
goog.labs.useragent.verifier.NOT_IE = 0;
/**
* Detect the the current IE version using runtime behavior, returns 0
* if a version of IE is not detected.
* @return {number}
*/
goog.labs.useragent.verifier.detectIeVersionByBehavior = function() {
if (document.all) {
if (!document.compatMode) {
return 5;
}
if (!window.XMLHttpRequest) {
return 6;
}
if (!document.querySelector) {
return 7;
}
if (!document.addEventListener) {
return 8;
}
if (!window.atob) {
return 9;
}
return 10;
}
if (!(window.ActiveXObject) && 'ActiveXObject' in window) {
return 11;
}
return goog.labs.useragent.verifier.NOT_IE;
};
/**
* Detect the the current IE version using MSIE version presented in the
* user agent string (This will not detected IE 11 which does not present a
* MSIE version), or zero if IE is not detected.
* @return {number}
*/
goog.labs.useragent.verifier.detectIeVersionByNavigator = function() {
var ua = navigator.userAgent.toLowerCase();
if (ua.indexOf('msie') != -1) {
var value = parseInt(ua.split('msie')[1], 10);
if (typeof value == 'number' && !isNaN(value)) {
return value;
}
}
return goog.labs.useragent.verifier.NOT_IE;
};
/**
* Correct the actual IE version based on the Trident version in the user agent
* string. This adjusts for IE's "compatiblity modes".
* @return {number}
*/
goog.labs.useragent.verifier.getCorrectedIEVersionByNavigator = function() {
var ua = navigator.userAgent;
if (/Trident/.test(ua) || /MSIE/.test(ua)) {
return goog.labs.useragent.verifier.getIEVersion_(ua);
} else {
return goog.labs.useragent.verifier.NOT_IE;
}
};
/**
* Get corrected IE version, see goog.labs.userAgent.browser.getIEVersion_
*
* @param {string} userAgent the User-Agent.
* @return {number}
* @private
*/
goog.labs.useragent.verifier.getIEVersion_ = function(userAgent) {
// IE11 may identify itself as MSIE 9.0 or MSIE 10.0 due to an IE 11 upgrade
// bug. Example UA:
// Mozilla/5.0 (MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)
// like Gecko.
var rv = /rv: *([\d\.]*)/.exec(userAgent);
if (rv && rv[1]) {
return Number(rv[1]);
}
var msie = /MSIE +([\d\.]+)/.exec(userAgent);
if (msie && msie[1]) {
// IE in compatibility mode usually identifies itself as MSIE 7.0; in this
// case, use the Trident version to determine the version of IE. For more
// details, see the links above.
var tridentVersion = /Trident\/(\d.\d)/.exec(userAgent);
if (msie[1] == '7.0') {
if (tridentVersion && tridentVersion[1]) {
switch (tridentVersion[1]) {
case '4.0':
return 8;
case '5.0':
return 9;
case '6.0':
return 10;
case '7.0':
return 11;
}
} else {
return 7;
}
} else {
return Number(msie[1]);
}
}
return goog.labs.useragent.verifier.NOT_IE;
};
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