85 lines
1.9 KiB
JavaScript
85 lines
1.9 KiB
JavaScript
/**
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* Contains interface module
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*
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* Copyright (C) 2010 Mike Gerwitz
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*
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* This file is part of ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser 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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* @author Mike Gerwitz
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* @package core
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*/
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var util = require( './util' );
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/**
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* Creates an interface
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*
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* @return {Interface} extended interface
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*/
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exports.extend = function()
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{
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return extend.apply( this, arguments );
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}
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/**
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* Default interface implementation
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*
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* @return {undefined}
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*/
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function Interface() {}
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function extend()
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{
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var args = Array.prototype.slice.call( arguments ),
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props = prop_check( args.pop() ) || {},
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base = args.pop() || Interface,
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prototype = new base();
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var new_interface = {};
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// freeze the interface (preventing additions), if supported
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util.freeze( new_interface );
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return new_interface;
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}
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/**
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* Checks to ensure that only methods are being declared
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*
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* @param {Object} props interface definition
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*
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* @return {Object} the same properties that were passed to the function
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*/
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function prop_check( props )
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{
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for ( prop in props )
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{
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if ( !( props[ prop ] instanceof Function ) )
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{
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throw new Error(
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"Only methods are permitted within Interface definitons"
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);
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}
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}
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return props;
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}
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