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6 | module.exports = Emitter;
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7 |
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9 |
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12 |
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13 |
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14 | function Emitter(obj) {
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15 | if (obj) return mixin(obj);
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16 | };
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17 |
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18 |
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19 |
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20 |
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21 |
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22 |
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23 |
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24 |
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25 |
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26 | function mixin(obj) {
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27 | for (var key in Emitter.prototype) {
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28 | obj[key] = Emitter.prototype[key];
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29 | }
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30 | return obj;
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31 | }
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32 |
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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 |
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38 |
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39 |
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40 |
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41 |
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42 | Emitter.prototype.on =
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43 | Emitter.prototype.addEventListener = function(event, fn){
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44 | this._callbacks = this._callbacks || {};
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45 | (this._callbacks[event] = this._callbacks[event] || [])
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46 | .push(fn);
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47 | return this;
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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 |
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53 |
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54 |
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55 |
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56 |
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57 |
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58 |
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59 |
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60 | Emitter.prototype.once = function(event, fn){
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61 | var self = this;
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62 | this._callbacks = this._callbacks || {};
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63 |
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64 | function on() {
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65 | self.off(event, on);
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66 | fn.apply(this, arguments);
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67 | }
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68 |
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69 | on.fn = fn;
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70 | this.on(event, on);
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71 | return this;
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72 | };
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73 |
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75 |
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76 |
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77 |
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78 |
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79 |
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80 |
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81 |
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82 |
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83 |
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84 | Emitter.prototype.off =
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85 | Emitter.prototype.removeListener =
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86 | Emitter.prototype.removeAllListeners =
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87 | Emitter.prototype.removeEventListener = function(event, fn){
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88 | this._callbacks = this._callbacks || {};
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89 |
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90 |
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91 | if (0 == arguments.length) {
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92 | this._callbacks = {};
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93 | return this;
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94 | }
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95 |
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96 |
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97 | var callbacks = this._callbacks[event];
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98 | if (!callbacks) return this;
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99 |
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100 |
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101 | if (1 == arguments.length) {
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102 | delete this._callbacks[event];
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103 | return this;
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104 | }
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105 |
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106 |
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107 | var cb;
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108 | for (var i = 0; i < callbacks.length; i++) {
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109 | cb = callbacks[i];
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110 | if (cb === fn || cb.fn === fn) {
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111 | callbacks.splice(i, 1);
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112 | break;
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113 | }
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114 | }
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115 | return this;
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116 | };
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117 |
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118 |
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119 |
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120 |
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121 |
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122 |
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123 |
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124 |
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125 |
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126 | Emitter.prototype.emit = function(event){
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127 | this._callbacks = this._callbacks || {};
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128 | var args = [].slice.call(arguments, 1)
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129 | , callbacks = this._callbacks[event];
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130 |
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131 | if (callbacks) {
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132 | callbacks = callbacks.slice(0);
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133 | for (var i = 0, len = callbacks.length; i < len; ++i) {
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134 | callbacks[i].apply(this, args);
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135 | }
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136 | }
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137 |
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138 | return this;
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139 | };
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140 |
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141 |
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142 |
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143 |
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144 |
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145 |
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146 |
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147 |
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148 |
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149 | Emitter.prototype.listeners = function(event){
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150 | this._callbacks = this._callbacks || {};
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151 | return this._callbacks[event] || [];
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152 | };
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153 |
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154 |
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155 |
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156 |
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157 |
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158 |
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159 |
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160 |
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161 |
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162 | Emitter.prototype.hasListeners = function(event){
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163 | return !! this.listeners(event).length;
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164 | };
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