1 | /*! |
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2 | * Class definition |
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3 | * |
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4 | * Copyright (c) 2008 John Resig (http://ejohn.org/blog/simple-javascript-inheritance/) |
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5 | * Inspired by base2 and Prototype |
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6 | */ |
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7 | |
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8 | "use strict"; |
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9 | |
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10 | (function () { |
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11 | |
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12 | var initializing = false, |
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13 | |
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14 | fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/; |
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15 | |
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16 | // The base Class implementation (does nothing) |
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17 | this.Class = function(){}; |
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18 | |
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19 | // Create a new Class that inherits from this class |
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20 | Class.extend = function (prop) |
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21 | { |
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22 | var _super = this.prototype; |
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23 | |
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24 | // Instantiate a base class (but only create the instance, don't run the init constructor) |
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25 | initializing = true; |
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26 | |
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27 | var prototype = new this(); |
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28 | |
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29 | initializing = false; |
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30 | |
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31 | // Copy the properties over onto the new prototype |
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32 | for (var name in prop) |
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33 | { |
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34 | |
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35 | // Check if we're overwriting an existing function |
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36 | prototype[name] = (typeof prop[name] === "function" && typeof _super[name] === "function" && fnTest.test(prop[name]) ? |
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37 | |
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38 | (function(name, fn) |
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39 | { |
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40 | return function() |
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41 | { |
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42 | var tmp = this._super; |
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43 | |
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44 | // Add a new ._super() method that is the same method |
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45 | // but on the super-class |
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46 | this._super = _super[name]; |
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47 | |
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48 | // The method only need to be bound temporarily, so we |
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49 | // remove it when we're done executing |
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50 | var ret = fn.apply(this, arguments); |
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51 | this._super = tmp; |
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52 | |
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53 | return ret; |
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54 | }; |
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55 | }(name, prop[name])) : prop[name]); |
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56 | } |
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57 | |
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58 | // The dummy class constructor |
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59 | function Class() |
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60 | { |
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61 | // All construction is actually done in the init method |
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62 | if (!initializing && this.init) |
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63 | { |
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64 | this.init.apply(this, arguments); |
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65 | } |
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66 | } |
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67 | |
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68 | // Populate our constructed prototype object |
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69 | Class.prototype = prototype; |
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70 | |
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71 | // Enforce the constructor to be what we expect |
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72 | Class.constructor = Class; |
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73 | |
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74 | // And make this class extendable |
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75 | Class.extend = arguments.callee; |
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76 | |
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77 | return Class; |
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78 | }; |
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79 | |
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80 | }()); |
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