1 | 'use strict';
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2 |
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3 | var has = Object.prototype.hasOwnProperty
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4 | , prefix = '~';
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5 |
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6 |
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7 |
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8 |
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9 |
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10 |
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11 |
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12 |
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13 | function Events() {}
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14 |
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15 |
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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 | if (Object.create) {
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23 | Events.prototype = Object.create(null);
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24 |
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25 |
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26 |
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27 |
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28 |
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29 | if (!new Events().__proto__) prefix = false;
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30 | }
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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 | function EE(fn, context, once) {
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42 | this.fn = fn;
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43 | this.context = context;
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44 | this.once = once || false;
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45 | }
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46 |
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47 |
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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 | function EventEmitter() {
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55 | this._events = new Events();
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56 | this._eventsCount = 0;
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57 | }
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58 |
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59 |
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60 |
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61 |
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62 |
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63 |
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64 |
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65 |
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66 | EventEmitter.prototype.eventNames = function eventNames() {
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67 | var names = []
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68 | , events
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69 | , name;
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70 |
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71 | if (this._eventsCount === 0) return names;
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72 |
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73 | for (name in (events = this._events)) {
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74 | if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
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75 | }
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76 |
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77 | if (Object.getOwnPropertySymbols) {
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78 | return names.concat(Object.getOwnPropertySymbols(events));
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79 | }
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80 |
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81 | return names;
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82 | };
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83 |
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84 |
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85 |
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86 |
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87 |
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88 |
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89 |
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90 |
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91 |
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92 | EventEmitter.prototype.listeners = function listeners(event, exists) {
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93 | var evt = prefix ? prefix + event : event
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94 | , available = this._events[evt];
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95 |
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96 | if (exists) return !!available;
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97 | if (!available) return [];
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98 | if (available.fn) return [available.fn];
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99 |
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100 | for (var i = 0, l = available.length, ee = new Array(l); i < l; i++) {
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101 | ee[i] = available[i].fn;
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102 | }
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103 |
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104 | return ee;
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105 | };
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106 |
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107 |
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108 |
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109 |
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110 |
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111 |
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112 |
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113 |
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114 | EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
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115 | var evt = prefix ? prefix + event : event;
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116 |
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117 | if (!this._events[evt]) return false;
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118 |
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119 | var listeners = this._events[evt]
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120 | , len = arguments.length
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121 | , args
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122 | , i;
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123 |
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124 | if (listeners.fn) {
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125 | if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);
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126 |
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127 | switch (len) {
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128 | case 1: return listeners.fn.call(listeners.context), true;
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129 | case 2: return listeners.fn.call(listeners.context, a1), true;
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130 | case 3: return listeners.fn.call(listeners.context, a1, a2), true;
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131 | case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
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132 | case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
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133 | case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
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134 | }
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135 |
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136 | for (i = 1, args = new Array(len -1); i < len; i++) {
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137 | args[i - 1] = arguments[i];
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138 | }
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139 |
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140 | listeners.fn.apply(listeners.context, args);
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141 | } else {
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142 | var length = listeners.length
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143 | , j;
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144 |
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145 | for (i = 0; i < length; i++) {
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146 | if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);
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147 |
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148 | switch (len) {
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149 | case 1: listeners[i].fn.call(listeners[i].context); break;
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150 | case 2: listeners[i].fn.call(listeners[i].context, a1); break;
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151 | case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
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152 | case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
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153 | default:
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154 | if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
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155 | args[j - 1] = arguments[j];
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156 | }
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157 |
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158 | listeners[i].fn.apply(listeners[i].context, args);
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159 | }
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160 | }
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161 | }
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162 |
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163 | return true;
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164 | };
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165 |
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166 |
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167 |
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168 |
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169 |
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170 |
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171 |
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172 |
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173 |
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174 |
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175 | EventEmitter.prototype.on = function on(event, fn, context) {
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176 | var listener = new EE(fn, context || this)
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177 | , evt = prefix ? prefix + event : event;
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178 |
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179 | if (!this._events[evt]) this._events[evt] = listener, this._eventsCount++;
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180 | else if (!this._events[evt].fn) this._events[evt].push(listener);
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181 | else this._events[evt] = [this._events[evt], listener];
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182 |
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183 | return this;
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184 | };
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185 |
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186 |
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187 |
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188 |
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189 |
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190 |
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191 |
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192 |
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193 |
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194 |
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195 | EventEmitter.prototype.once = function once(event, fn, context) {
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196 | var listener = new EE(fn, context || this, true)
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197 | , evt = prefix ? prefix + event : event;
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198 |
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199 | if (!this._events[evt]) this._events[evt] = listener, this._eventsCount++;
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200 | else if (!this._events[evt].fn) this._events[evt].push(listener);
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201 | else this._events[evt] = [this._events[evt], listener];
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202 |
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203 | return this;
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204 | };
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205 |
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206 |
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207 |
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208 |
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209 |
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210 |
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211 |
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212 |
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213 |
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214 |
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215 |
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216 | EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
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217 | var evt = prefix ? prefix + event : event;
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218 |
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219 | if (!this._events[evt]) return this;
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220 | if (!fn) {
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221 | if (--this._eventsCount === 0) this._events = new Events();
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222 | else delete this._events[evt];
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223 | return this;
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224 | }
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225 |
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226 | var listeners = this._events[evt];
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227 |
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228 | if (listeners.fn) {
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229 | if (
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230 | listeners.fn === fn
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231 | && (!once || listeners.once)
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232 | && (!context || listeners.context === context)
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233 | ) {
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234 | if (--this._eventsCount === 0) this._events = new Events();
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235 | else delete this._events[evt];
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236 | }
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237 | } else {
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238 | for (var i = 0, events = [], length = listeners.length; i < length; i++) {
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239 | if (
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240 | listeners[i].fn !== fn
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241 | || (once && !listeners[i].once)
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242 | || (context && listeners[i].context !== context)
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243 | ) {
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244 | events.push(listeners[i]);
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245 | }
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246 | }
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247 |
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248 |
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249 |
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250 |
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251 | if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
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252 | else if (--this._eventsCount === 0) this._events = new Events();
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253 | else delete this._events[evt];
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254 | }
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255 |
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256 | return this;
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257 | };
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258 |
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259 |
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260 |
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261 |
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262 |
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263 |
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264 |
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265 |
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266 | EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
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267 | var evt;
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268 |
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269 | if (event) {
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270 | evt = prefix ? prefix + event : event;
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271 | if (this._events[evt]) {
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272 | if (--this._eventsCount === 0) this._events = new Events();
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273 | else delete this._events[evt];
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274 | }
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275 | } else {
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276 | this._events = new Events();
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277 | this._eventsCount = 0;
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278 | }
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279 |
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280 | return this;
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281 | };
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282 |
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283 |
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284 |
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285 |
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286 | EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
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287 | EventEmitter.prototype.addListener = EventEmitter.prototype.on;
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288 |
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289 |
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290 |
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291 |
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292 | EventEmitter.prototype.setMaxListeners = function setMaxListeners() {
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293 | return this;
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294 | };
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295 |
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296 |
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297 |
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298 |
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299 | EventEmitter.prefixed = prefix;
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300 |
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301 |
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302 |
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303 |
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304 | EventEmitter.EventEmitter = EventEmitter;
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305 |
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306 |
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307 |
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308 |
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309 | if ('undefined' !== typeof module) {
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310 | module.exports = EventEmitter;
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311 | }
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