81 lines
2.4 KiB
JavaScript
81 lines
2.4 KiB
JavaScript
/**
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* Contains fallback visibility object factory
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*
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* Copyright (C) 2010, 2011, 2013, 2014 Free Software Foundation, Inc.
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*
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* This file is part of GNU ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Initializes fallback visibility object factory
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*
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* Unlike the standard visibility object, fallback does not create various
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* layers. This is for the simple fact that setting a value on one of the layers
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* is not visible to layers beneath it (its prototypes). Fallback is necessary
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* if proxy support or emulation (via ES5 getters/setters) is unavailable.
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*/
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module.exports = exports = function FallbackVisibilityObjectFactory()
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{
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// permit omitting 'new' keyword
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if ( !( this instanceof exports ) )
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{
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// module.exports for Closure Compiler
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return new module.exports();
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}
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};
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/**
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* "Inherit" from VisibilityObjectFactory
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*/
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exports.prototype = require( './VisibilityObjectFactory' )();
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/**
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* Do not create private visibility layer
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*
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* We're likely falling back because we cannot properly support the private
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* visibility layer. Therefore, it will be omitted.
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*
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* @param {Object} atop_of will be returned, unmodified
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* @param {Object} properties ignored
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*
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* @return {Object} provided object with no additional layer
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*/
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exports.prototype._createPrivateLayer = function( atop_of, properties )
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{
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return atop_of;
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};
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/**
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* Does not create property proxy
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*
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* The fallback implementation is used because proxies are not supported and
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* cannot be emulated with getters/setters.
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*
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* @param {Object} base will be returned, unmodified
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* @param {Object} dest ignored
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* @param {Object} props ignored
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*
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* @return {Object} given base
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*/
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exports.prototype.createPropProxy = function( base, dest, props )
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{
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return base;
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};
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