96 lines
2.7 KiB
JavaScript
96 lines
2.7 KiB
JavaScript
// Copyright 2007 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 Detection of JScript version.
|
|
*
|
|
* @author arv@google.com (Erik Arvidsson)
|
|
*/
|
|
|
|
|
|
goog.provide('goog.userAgent.jscript');
|
|
|
|
goog.require('goog.string');
|
|
|
|
|
|
/**
|
|
* @define {boolean} True if it is known at compile time that the runtime
|
|
* environment will not be using JScript.
|
|
*/
|
|
goog.define('goog.userAgent.jscript.ASSUME_NO_JSCRIPT', false);
|
|
|
|
|
|
/**
|
|
* Initializer for goog.userAgent.jscript. Detects if the user agent is using
|
|
* Microsoft JScript and which version of it.
|
|
*
|
|
* This is a named function so that it can be stripped via the jscompiler
|
|
* option for stripping types.
|
|
* @private
|
|
*/
|
|
goog.userAgent.jscript.init_ = function() {
|
|
var hasScriptEngine = 'ScriptEngine' in goog.global;
|
|
|
|
/**
|
|
* @type {boolean}
|
|
* @private
|
|
*/
|
|
goog.userAgent.jscript.DETECTED_HAS_JSCRIPT_ =
|
|
hasScriptEngine && goog.global['ScriptEngine']() == 'JScript';
|
|
|
|
/**
|
|
* @type {string}
|
|
* @private
|
|
*/
|
|
goog.userAgent.jscript.DETECTED_VERSION_ =
|
|
goog.userAgent.jscript.DETECTED_HAS_JSCRIPT_ ?
|
|
(goog.global['ScriptEngineMajorVersion']() + '.' +
|
|
goog.global['ScriptEngineMinorVersion']() + '.' +
|
|
goog.global['ScriptEngineBuildVersion']()) :
|
|
'0';
|
|
};
|
|
|
|
if (!goog.userAgent.jscript.ASSUME_NO_JSCRIPT) {
|
|
goog.userAgent.jscript.init_();
|
|
}
|
|
|
|
|
|
/**
|
|
* Whether we detect that the user agent is using Microsoft JScript.
|
|
* @type {boolean}
|
|
*/
|
|
goog.userAgent.jscript.HAS_JSCRIPT = goog.userAgent.jscript.ASSUME_NO_JSCRIPT ?
|
|
false : goog.userAgent.jscript.DETECTED_HAS_JSCRIPT_;
|
|
|
|
|
|
/**
|
|
* The installed version of JScript.
|
|
* @type {string}
|
|
*/
|
|
goog.userAgent.jscript.VERSION = goog.userAgent.jscript.ASSUME_NO_JSCRIPT ?
|
|
'0' : goog.userAgent.jscript.DETECTED_VERSION_;
|
|
|
|
|
|
/**
|
|
* Whether the installed version of JScript is as new or newer than a given
|
|
* version.
|
|
* @param {string} version The version to check.
|
|
* @return {boolean} Whether the installed version of JScript is as new or
|
|
* newer than the given version.
|
|
*/
|
|
goog.userAgent.jscript.isVersion = function(version) {
|
|
return goog.string.compareVersions(goog.userAgent.jscript.VERSION,
|
|
version) >= 0;
|
|
};
|