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// 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.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;
};
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