1 |
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2 |
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3 |
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4 |
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5 | Function.prototype.bind = Function.prototype.bind || function (thisp) {
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6 | var fn = this;
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7 | return function () {
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8 | return fn.apply(thisp, arguments);
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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 |
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14 | (function(global){
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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 | var NativePromise = global['Promise'];
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21 | var nativePromiseSupported =
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22 | NativePromise &&
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23 |
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24 |
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25 | 'resolve' in NativePromise &&
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26 | 'reject' in NativePromise &&
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27 | 'all' in NativePromise &&
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28 | 'race' in NativePromise &&
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29 |
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30 |
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31 | (function(){
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32 | var resolve;
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33 | new NativePromise(function(r){ resolve = r; });
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34 | return typeof resolve === 'function';
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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 | if (typeof exports !== 'undefined' && exports)
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43 | {
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44 |
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45 | exports.Promise = nativePromiseSupported ? NativePromise : Promise;
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46 | exports.Polyfill = Promise;
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47 | }
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48 | else
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49 | {
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50 |
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51 | if (typeof define == 'function' && define.amd)
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52 | {
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53 | define(function(){
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54 | return nativePromiseSupported ? NativePromise : Promise;
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55 | });
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56 | }
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57 | else
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58 | {
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59 |
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60 | if (!nativePromiseSupported)
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61 | global['Promise'] = Promise;
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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 |
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67 |
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68 |
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69 |
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70 | var PENDING = 'pending';
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71 | var SEALED = 'sealed';
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72 | var FULFILLED = 'fulfilled';
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73 | var REJECTED = 'rejected';
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74 | var NOOP = function(){};
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75 |
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76 | function isArray(value) {
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77 | return Object.prototype.toString.call(value) === '[object Array]';
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78 | }
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79 |
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80 |
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81 | var asyncSetTimer = typeof setImmediate !== 'undefined' ? setImmediate : setTimeout;
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82 | var asyncQueue = [];
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83 | var asyncTimer;
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84 |
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85 | function asyncFlush(){
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86 |
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87 | for (var i = 0; i < asyncQueue.length; i++)
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88 | asyncQueue[i][0](asyncQueue[i][1]);
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89 |
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90 |
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91 | asyncQueue = [];
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92 | asyncTimer = false;
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93 | }
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94 |
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95 | function asyncCall(callback, arg){
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96 | asyncQueue.push([callback, arg]);
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97 |
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98 | if (!asyncTimer)
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99 | {
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100 | asyncTimer = true;
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101 | asyncSetTimer(asyncFlush, 0);
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102 | }
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103 | }
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104 |
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105 |
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106 | function invokeResolver(resolver, promise) {
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107 | function resolvePromise(value) {
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108 | resolve(promise, value);
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109 | }
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110 |
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111 | function rejectPromise(reason) {
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112 | reject(promise, reason);
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113 | }
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114 |
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115 | try {
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116 | resolver(resolvePromise, rejectPromise);
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117 | } catch(e) {
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118 | rejectPromise(e);
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119 | }
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120 | }
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121 |
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122 | function invokeCallback(subscriber){
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123 | var owner = subscriber.owner;
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124 | var settled = owner.state_;
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125 | var value = owner.data_;
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126 | var callback = subscriber[settled];
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127 | var promise = subscriber.then;
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128 |
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129 | if (typeof callback === 'function')
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130 | {
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131 | settled = FULFILLED;
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132 | try {
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133 | value = callback(value);
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134 | } catch(e) {
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135 | reject(promise, e);
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136 | }
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137 | }
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138 |
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139 | if (!handleThenable(promise, value))
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140 | {
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141 | if (settled === FULFILLED)
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142 | resolve(promise, value);
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143 |
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144 | if (settled === REJECTED)
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145 | reject(promise, value);
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146 | }
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147 | }
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148 |
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149 | function handleThenable(promise, value) {
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150 | var resolved;
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151 |
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152 | try {
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153 | if (promise === value)
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154 | throw new TypeError('A promises callback cannot return that same promise.');
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155 |
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156 | if (value && (typeof value === 'function' || typeof value === 'object'))
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157 | {
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158 | var then = value.then;
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159 |
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160 | if (typeof then === 'function')
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161 | {
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162 | then.call(value, function(val){
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163 | if (!resolved)
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164 | {
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165 | resolved = true;
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166 |
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167 | if (value !== val)
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168 | resolve(promise, val);
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169 | else
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170 | fulfill(promise, val);
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171 | }
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172 | }, function(reason){
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173 | if (!resolved)
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174 | {
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175 | resolved = true;
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176 |
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177 | reject(promise, reason);
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178 | }
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179 | });
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180 |
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181 | return true;
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182 | }
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183 | }
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184 | } catch (e) {
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185 | if (!resolved)
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186 | reject(promise, e);
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187 |
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188 | return true;
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189 | }
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190 |
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191 | return false;
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192 | }
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193 |
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194 | function resolve(promise, value){
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195 | if (promise === value || !handleThenable(promise, value))
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196 | fulfill(promise, value);
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197 | }
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198 |
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199 | function fulfill(promise, value){
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200 | if (promise.state_ === PENDING)
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201 | {
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202 | promise.state_ = SEALED;
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203 | promise.data_ = value;
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204 |
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205 | asyncCall(publishFulfillment, promise);
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206 | }
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207 | }
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208 |
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209 | function reject(promise, reason){
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210 | if (promise.state_ === PENDING)
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211 | {
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212 | promise.state_ = SEALED;
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213 | promise.data_ = reason;
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214 |
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215 | asyncCall(publishRejection, promise);
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216 | }
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217 | }
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218 |
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219 | function publish(promise) {
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220 | var callbacks = promise.then_;
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221 | promise.then_ = undefined;
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222 |
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223 | for (var i = 0; i < callbacks.length; i++) {
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224 | invokeCallback(callbacks[i]);
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225 | }
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226 | }
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227 |
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228 | function publishFulfillment(promise){
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229 | promise.state_ = FULFILLED;
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230 | publish(promise);
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231 | }
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232 |
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233 | function publishRejection(promise){
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234 | promise.state_ = REJECTED;
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235 | publish(promise);
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236 | }
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237 |
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238 |
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239 |
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240 |
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241 | function Promise(resolver){
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242 | if (typeof resolver !== 'function')
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243 | throw new TypeError('Promise constructor takes a function argument');
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244 |
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245 | if (this instanceof Promise === false)
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246 | throw new TypeError('Failed to construct \'Promise\': Please use the \'new\' operator, this object constructor cannot be called as a function.');
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247 |
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248 | this.then_ = [];
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249 |
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250 | invokeResolver(resolver, this);
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251 | }
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252 |
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253 | Promise.prototype = {
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254 | constructor: Promise,
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255 |
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256 | state_: PENDING,
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257 | then_: null,
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258 | data_: undefined,
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259 |
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260 | then: function(onFulfillment, onRejection){
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261 | var subscriber = {
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262 | owner: this,
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263 | then: new this.constructor(NOOP),
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264 | fulfilled: onFulfillment,
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265 | rejected: onRejection
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266 | };
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267 |
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268 | if (this.state_ === FULFILLED || this.state_ === REJECTED)
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269 | {
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270 |
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271 | asyncCall(invokeCallback, subscriber);
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272 | }
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273 | else
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274 | {
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275 |
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276 | this.then_.push(subscriber);
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277 | }
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278 |
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279 | return subscriber.then;
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280 | },
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281 |
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282 | 'catch': function(onRejection) {
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283 | return this.then(null, onRejection);
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284 | }
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285 | };
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286 |
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287 | Promise.all = function(promises){
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288 | var Class = this;
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289 |
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290 | if (!isArray(promises))
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291 | throw new TypeError('You must pass an array to Promise.all().');
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292 |
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293 | return new Class(function(resolve, reject){
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294 | var results = [];
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295 | var remaining = 0;
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296 |
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297 | function resolver(index){
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298 | remaining++;
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299 | return function(value){
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300 | results[index] = value;
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301 | if (!--remaining)
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302 | resolve(results);
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303 | };
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304 | }
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305 |
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306 | for (var i = 0, promise; i < promises.length; i++)
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307 | {
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308 | promise = promises[i];
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309 |
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310 | if (promise && typeof promise.then === 'function')
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311 | promise.then(resolver(i), reject);
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312 | else
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313 | results[i] = promise;
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314 | }
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315 |
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316 | if (!remaining)
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317 | resolve(results);
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318 | });
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319 | };
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320 |
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321 | Promise.race = function(promises){
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322 | var Class = this;
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323 |
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324 | if (!isArray(promises))
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325 | throw new TypeError('You must pass an array to Promise.race().');
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326 |
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327 | return new Class(function(resolve, reject) {
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328 | for (var i = 0, promise; i < promises.length; i++)
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329 | {
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330 | promise = promises[i];
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331 |
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332 | if (promise && typeof promise.then === 'function')
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333 | promise.then(resolve, reject);
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334 | else
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335 | resolve(promise);
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336 | }
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337 | });
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338 | };
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339 |
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340 | Promise.resolve = function(value){
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341 | var Class = this;
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342 |
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343 | if (value && typeof value === 'object' && value.constructor === Class)
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344 | return value;
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345 |
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346 | return new Class(function(resolve){
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347 | resolve(value);
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348 | });
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349 | };
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350 |
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351 | Promise.reject = function(reason){
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352 | var Class = this;
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353 |
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354 | return new Class(function(resolve, reject){
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355 | reject(reason);
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356 | });
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357 | };
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358 |
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359 | })(typeof window != 'undefined' ? window : typeof global != 'undefined' ? global : typeof self != 'undefined' ? self : this);
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