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easejs/lib/VisibilityObjectFactoryFact...

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/**
* Contains factory for visibility object factory
*
* Copyright (C) 2011, 2013 Free Software Foundation, Inc.
*
* This file is part of GNU ease.js.
*
* ease.js is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* XXX: Figure out how to resolve Closure Compiler's warning about shared
* type information
*/
// XXX: Tightly coupled
var util = require( './util' ),
VisibilityObjectFactory = require( './VisibilityObjectFactory' ),
FallbackVisibilityObjectFactory =
require( './FallbackVisibilityObjectFactory' )
;
/**
* Responsible for instantiating the VisibilityObjectFactory appropriate for the
* runtime environment
*
* This prototype determines what class should be instantiated. If we are within
* an ECMAScript 5 environment, we can take full advantage of the standard
* visibility object implementation. Otherwise, we are unable to emulate proxies
* and must fall back on a less sophisticated implementation that sacrifices
* visibility support.
*/
exports.fromEnvironment = function()
{
// if falling back, return fallback, otherwise standard
return ( util.definePropertyFallback() )
? FallbackVisibilityObjectFactory()
: VisibilityObjectFactory()
;
};