1 | // https://gist.github.com/2956493 |
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2 | |
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3 | /** |
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4 | July 30th 2012 |
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5 | Damien "Mistic"Sorel |
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6 | add increment() and decrement() methods |
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7 | */ |
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8 | |
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9 | var MultiGetSet = function(opt){ |
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10 | |
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11 | var getType = function(o) { |
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12 | return ({}).toString.call(o).match(/\s([a-zA-Z]+)/)[1].toLowerCase() |
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13 | }; |
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14 | |
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15 | if(!opt.public || !opt.private) |
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16 | return opt.public; |
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17 | |
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18 | if(opt.handler && opt.handler.init) |
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19 | opt.handler.init(opt); |
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20 | |
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21 | if(!opt.handler || !opt.handler.setter){ |
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22 | opt.public.set = function(paramName, newValue){ |
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23 | opt.private[paramName] = newValue; |
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24 | }; |
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25 | }else{ |
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26 | opt.public.set = function(paramName, newValue){ |
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27 | return opt.handler.setter({ |
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28 | public: opt.public, |
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29 | private: opt.private, |
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30 | paramName: paramName, |
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31 | newValue: newValue, |
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32 | caller: arguments.callee.caller |
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33 | }); |
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34 | }; |
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35 | } |
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36 | |
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37 | if(!opt.handler || !opt.handler.getter){ |
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38 | opt.public.get = function(paramName){ |
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39 | return opt.private[paramName]; |
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40 | }; |
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41 | }else{ |
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42 | opt.public.get = function(paramName){ |
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43 | return opt.handler.getter({ |
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44 | public: opt.public, |
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45 | private: opt.private, |
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46 | paramName: paramName, |
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47 | caller: arguments.callee.caller |
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48 | }); |
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49 | }; |
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50 | } |
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51 | |
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52 | if(!opt.handler || !opt.handler.adder){ |
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53 | opt.public.add = function(paramName, newValue){ |
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54 | if(getType(opt.private[paramName])==="array") |
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55 | opt.private[paramName].push(newValue); |
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56 | }; |
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57 | }else{ |
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58 | opt.public.add = function(paramName, newValue){ |
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59 | if(getType(opt.private[paramName])==="array") |
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60 | return opt.handler.adder({ |
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61 | public: opt.public, |
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62 | private: opt.private, |
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63 | paramName: paramName, |
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64 | newValue: newValue, |
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65 | caller: arguments.callee.caller |
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66 | }); |
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67 | }; |
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68 | } |
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69 | |
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70 | opt.public.increment = function(paramName, add) { |
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71 | if (add == null) add = 1; |
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72 | opt.public.set(paramName, opt.public.get(paramName)+add); |
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73 | }; |
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74 | |
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75 | opt.public.decrement = function(paramName, rem) { |
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76 | if (rem == null) rem = 1; |
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77 | opt.public.increment(paramName, -rem); |
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78 | }; |
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79 | |
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80 | return opt.public; |
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81 | }; |
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82 | |
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83 | var Observable = { |
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84 | |
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85 | |
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86 | clone: function(o){ |
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87 | if(o == null || typeof(o) != 'object') |
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88 | return o; |
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89 | |
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90 | var temp = o.constructor(); // changed |
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91 | |
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92 | for(var key in o) |
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93 | temp[key] = Observable.clone(o[key]); |
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94 | return temp; |
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95 | }, |
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96 | |
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97 | init: function(opt){ |
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98 | opt.public.listeners = {}; |
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99 | |
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100 | opt.public.listen = function(paramName, callback){ |
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101 | if(Object.prototype.toString.call(paramName) === '[object Array]') |
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102 | for(var p in paramName){ |
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103 | opt.public.listenOne(paramName[p], callback); |
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104 | } |
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105 | else |
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106 | opt.public.listenOne(paramName, callback); |
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107 | }; |
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108 | |
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109 | opt.public.listenOne = function(paramName, callback){ |
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110 | if(!opt.public.listeners[paramName]) |
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111 | opt.public.listeners[paramName] = []; |
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112 | opt.public.listeners[paramName].push(callback); |
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113 | }; |
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114 | }, |
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115 | |
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116 | setter: function(opt){ |
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117 | if(opt.private[opt.paramName] == opt.newValue) |
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118 | return; |
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119 | |
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120 | opt.oldValue = Observable.clone(opt.private[opt.paramName]); |
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121 | |
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122 | opt.private[opt.paramName] = opt.newValue; |
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123 | |
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124 | for(var listener in opt.public.listeners[opt.paramName]){ |
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125 | if(opt.caller != opt.public.listeners[opt.paramName][listener]) |
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126 | opt.public.listeners[opt.paramName][listener](opt); |
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127 | } |
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128 | }, |
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129 | |
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130 | adder: function(opt){ |
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131 | if(opt.private[opt.paramName] == opt.newValue || !opt.private[opt.paramName].push) |
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132 | return; |
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133 | |
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134 | opt.oldValue = Observable.clone(opt.private[opt.paramName]); |
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135 | |
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136 | opt.private[opt.paramName].push(opt.newValue); |
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137 | opt.newValue = opt.private[opt.paramName]; |
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138 | |
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139 | for(var listener in opt.public.listeners[opt.paramName]){ |
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140 | if(opt.caller != opt.public.listeners[opt.paramName][listener]) |
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141 | opt.public.listeners[opt.paramName][listener](opt); |
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142 | } |
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143 | } |
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144 | }; |
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