1 | (function (global, undefined) {
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2 | "use strict";
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3 |
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4 | if (global.setImmediate) {
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5 | return;
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6 | }
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7 |
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8 | var nextHandle = 1;
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9 | var tasksByHandle = {};
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10 | var currentlyRunningATask = false;
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11 | var doc = global.document;
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12 | var registerImmediate;
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13 |
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14 | function setImmediate(callback) {
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15 |
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16 | if (typeof callback !== "function") {
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17 | callback = new Function("" + callback);
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18 | }
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19 |
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20 | var args = new Array(arguments.length - 1);
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21 | for (var i = 0; i < args.length; i++) {
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22 | args[i] = arguments[i + 1];
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23 | }
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24 |
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25 | var task = { callback: callback, args: args };
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26 | tasksByHandle[nextHandle] = task;
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27 | registerImmediate(nextHandle);
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28 | return nextHandle++;
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29 | }
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30 |
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31 | function clearImmediate(handle) {
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32 | delete tasksByHandle[handle];
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33 | }
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34 |
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35 | function run(task) {
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36 | var callback = task.callback;
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37 | var args = task.args;
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38 | switch (args.length) {
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39 | case 0:
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40 | callback();
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41 | break;
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42 | case 1:
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43 | callback(args[0]);
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44 | break;
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45 | case 2:
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46 | callback(args[0], args[1]);
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47 | break;
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48 | case 3:
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49 | callback(args[0], args[1], args[2]);
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50 | break;
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51 | default:
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52 | callback.apply(undefined, args);
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53 | break;
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54 | }
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55 | }
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56 |
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57 | function runIfPresent(handle) {
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58 |
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59 |
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60 | if (currentlyRunningATask) {
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61 |
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62 |
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63 | setTimeout(runIfPresent, 0, handle);
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64 | } else {
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65 | var task = tasksByHandle[handle];
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66 | if (task) {
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67 | currentlyRunningATask = true;
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68 | try {
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69 | run(task);
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70 | } finally {
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71 | clearImmediate(handle);
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72 | currentlyRunningATask = false;
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73 | }
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74 | }
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75 | }
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76 | }
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77 |
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78 | function installNextTickImplementation() {
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79 | registerImmediate = function(handle) {
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80 | process.nextTick(function () { runIfPresent(handle); });
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81 | };
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82 | }
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83 |
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84 | function canUsePostMessage() {
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85 |
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86 |
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87 | if (global.postMessage && !global.importScripts) {
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88 | var postMessageIsAsynchronous = true;
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89 | var oldOnMessage = global.onmessage;
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90 | global.onmessage = function() {
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91 | postMessageIsAsynchronous = false;
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92 | };
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93 | global.postMessage("", "*");
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94 | global.onmessage = oldOnMessage;
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95 | return postMessageIsAsynchronous;
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96 | }
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97 | }
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98 |
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99 | function installPostMessageImplementation() {
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100 |
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101 |
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102 |
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103 |
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104 | var messagePrefix = "setImmediate$" + Math.random() + "$";
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105 | var onGlobalMessage = function(event) {
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106 | if (event.source === global &&
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107 | typeof event.data === "string" &&
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108 | event.data.indexOf(messagePrefix) === 0) {
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109 | runIfPresent(+event.data.slice(messagePrefix.length));
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110 | }
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111 | };
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112 |
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113 | if (global.addEventListener) {
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114 | global.addEventListener("message", onGlobalMessage, false);
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115 | } else {
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116 | global.attachEvent("onmessage", onGlobalMessage);
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117 | }
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118 |
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119 | registerImmediate = function(handle) {
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120 | global.postMessage(messagePrefix + handle, "*");
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121 | };
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122 | }
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123 |
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124 | function installMessageChannelImplementation() {
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125 | var channel = new MessageChannel();
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126 | channel.port1.onmessage = function(event) {
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127 | var handle = event.data;
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128 | runIfPresent(handle);
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129 | };
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130 |
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131 | registerImmediate = function(handle) {
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132 | channel.port2.postMessage(handle);
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133 | };
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134 | }
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135 |
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136 | function installReadyStateChangeImplementation() {
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137 | var html = doc.documentElement;
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138 | registerImmediate = function(handle) {
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139 |
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140 |
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141 | var script = doc.createElement("script");
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142 | script.onreadystatechange = function () {
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143 | runIfPresent(handle);
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144 | script.onreadystatechange = null;
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145 | html.removeChild(script);
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146 | script = null;
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147 | };
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148 | html.appendChild(script);
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149 | };
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150 | }
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151 |
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152 | function installSetTimeoutImplementation() {
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153 | registerImmediate = function(handle) {
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154 | setTimeout(runIfPresent, 0, handle);
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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 | var attachTo = Object.getPrototypeOf && Object.getPrototypeOf(global);
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160 | attachTo = attachTo && attachTo.setTimeout ? attachTo : global;
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161 |
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162 |
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163 | if ({}.toString.call(global.process) === "[object process]") {
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164 |
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165 | installNextTickImplementation();
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166 |
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167 | } else if (canUsePostMessage()) {
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168 |
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169 | installPostMessageImplementation();
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170 |
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171 | } else if (global.MessageChannel) {
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172 |
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173 | installMessageChannelImplementation();
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174 |
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175 | } else if (doc && "onreadystatechange" in doc.createElement("script")) {
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176 |
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177 | installReadyStateChangeImplementation();
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178 |
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179 | } else {
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180 |
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181 | installSetTimeoutImplementation();
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182 | }
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183 |
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184 | attachTo.setImmediate = setImmediate;
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185 | attachTo.clearImmediate = clearImmediate;
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186 | }(typeof self === "undefined" ? typeof global === "undefined" ? this : global : self));
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