mirror of https://gitee.com/bigwinds/arangodb
49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
/*jslint indent: 2, nomen: true, maxlen: 120, sloppy: true, vars: true */
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/*global module, require, exports */
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// Excerpt from Backbone Helpers
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// -------
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// Backbone.js 1.0.0
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//
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// (c) 2010-2013 Jeremy Ashkenas, DocumentCloud Inc.
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// Backbone may be freely distributed under the MIT license.
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// For all details and documentation:
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// http://backbonejs.org
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var _ = require("underscore");
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// Helper function to correctly set up the prototype chain, for subclasses.
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// Similar to `goog.inherits`, but uses a hash of prototype properties and
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// class properties to be extended.
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exports.extend = function(protoProps, staticProps) {
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var parent = this;
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var child;
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// The constructor function for the new subclass is either defined by you
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// (the "constructor" property in your `extend` definition), or defaulted
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// by us to simply call the parent's constructor.
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if (protoProps && _.has(protoProps, 'constructor')) {
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child = protoProps.constructor;
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} else {
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child = function(){ return parent.apply(this, arguments); };
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}
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// Add static properties to the constructor function, if supplied.
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_.extend(child, parent, staticProps);
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// Set the prototype chain to inherit from `parent`, without calling
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// `parent`'s constructor function.
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var Surrogate = function(){ this.constructor = child; };
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Surrogate.prototype = parent.prototype;
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child.prototype = new Surrogate;
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// Add prototype properties (instance properties) to the subclass,
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// if supplied.
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if (protoProps) _.extend(child.prototype, protoProps);
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// Set a convenience property in case the parent's prototype is needed
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// later.
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child.__super__ = parent.prototype;
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return child;
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};
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