1 |
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2 | (function (root, definition) {
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3 | "use strict";
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4 | if (typeof define === 'function' && define.amd) {
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5 | define(definition);
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6 | } else if (typeof module === 'object' && module.exports) {
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7 | module.exports = definition();
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8 | } else {
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9 | root.log = definition();
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10 | }
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11 | }(this, function () {
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12 | "use strict";
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13 |
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14 |
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15 | var noop = function() {};
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16 | var undefinedType = "undefined";
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17 |
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18 | var logMethods = [
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19 | "trace",
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20 | "debug",
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21 | "info",
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22 | "warn",
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23 | "error"
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24 | ];
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25 |
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26 |
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27 | function bindMethod(obj, methodName) {
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28 | var method = obj[methodName];
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29 | if (typeof method.bind === 'function') {
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30 | return method.bind(obj);
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31 | } else {
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32 | try {
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33 | return Function.prototype.bind.call(method, obj);
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34 | } catch (e) {
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35 |
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36 | return function() {
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37 | return Function.prototype.apply.apply(method, [obj, arguments]);
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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 |
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43 |
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44 |
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45 | function realMethod(methodName) {
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46 | if (methodName === 'debug') {
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47 | methodName = 'log';
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48 | }
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49 |
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50 | if (typeof console === undefinedType) {
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51 | return false;
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52 | } else if (console[methodName] !== undefined) {
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53 | return bindMethod(console, methodName);
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54 | } else if (console.log !== undefined) {
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55 | return bindMethod(console, 'log');
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56 | } else {
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57 | return noop;
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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 | function replaceLoggingMethods(level, loggerName) {
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64 |
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65 | for (var i = 0; i < logMethods.length; i++) {
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66 | var methodName = logMethods[i];
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67 | this[methodName] = (i < level) ?
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68 | noop :
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69 | this.methodFactory(methodName, level, loggerName);
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70 | }
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71 |
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72 |
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73 | this.log = this.debug;
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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 enableLoggingWhenConsoleArrives(methodName, level, loggerName) {
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79 | return function () {
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80 | if (typeof console !== undefinedType) {
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81 | replaceLoggingMethods.call(this, level, loggerName);
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82 | this[methodName].apply(this, arguments);
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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 | function defaultMethodFactory(methodName, level, loggerName) {
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90 |
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91 | return realMethod(methodName) ||
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92 | enableLoggingWhenConsoleArrives.apply(this, arguments);
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93 | }
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94 |
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95 | function Logger(name, defaultLevel, factory) {
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96 | var self = this;
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97 | var currentLevel;
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98 | var storageKey = "loglevel";
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99 | if (name) {
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100 | storageKey += ":" + name;
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101 | }
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102 |
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103 | function persistLevelIfPossible(levelNum) {
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104 | var levelName = (logMethods[levelNum] || 'silent').toUpperCase();
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105 |
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106 | if (typeof window === undefinedType) return;
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107 |
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108 |
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109 | try {
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110 | window.localStorage[storageKey] = levelName;
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111 | return;
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112 | } catch (ignore) {}
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113 |
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114 |
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115 | try {
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116 | window.document.cookie =
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117 | encodeURIComponent(storageKey) + "=" + levelName + ";";
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118 | } catch (ignore) {}
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119 | }
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120 |
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121 | function getPersistedLevel() {
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122 | var storedLevel;
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123 |
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124 | if (typeof window === undefinedType) return;
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125 |
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126 | try {
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127 | storedLevel = window.localStorage[storageKey];
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128 | } catch (ignore) {}
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129 |
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130 |
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131 | if (typeof storedLevel === undefinedType) {
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132 | try {
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133 | var cookie = window.document.cookie;
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134 | var location = cookie.indexOf(
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135 | encodeURIComponent(storageKey) + "=");
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136 | if (location !== -1) {
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137 | storedLevel = /^([^;]+)/.exec(cookie.slice(location))[1];
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138 | }
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139 | } catch (ignore) {}
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140 | }
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141 |
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142 |
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143 | if (self.levels[storedLevel] === undefined) {
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144 | storedLevel = undefined;
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145 | }
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146 |
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147 | return storedLevel;
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148 | }
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149 |
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150 | |
151 |
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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 | self.name = name;
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157 |
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158 | self.levels = { "TRACE": 0, "DEBUG": 1, "INFO": 2, "WARN": 3,
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159 | "ERROR": 4, "SILENT": 5};
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160 |
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161 | self.methodFactory = factory || defaultMethodFactory;
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162 |
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163 | self.getLevel = function () {
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164 | return currentLevel;
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165 | };
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166 |
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167 | self.setLevel = function (level, persist) {
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168 | if (typeof level === "string" && self.levels[level.toUpperCase()] !== undefined) {
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169 | level = self.levels[level.toUpperCase()];
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170 | }
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171 | if (typeof level === "number" && level >= 0 && level <= self.levels.SILENT) {
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172 | currentLevel = level;
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173 | if (persist !== false) {
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174 | persistLevelIfPossible(level);
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175 | }
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176 | replaceLoggingMethods.call(self, level, name);
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177 | if (typeof console === undefinedType && level < self.levels.SILENT) {
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178 | return "No console available for logging";
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179 | }
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180 | } else {
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181 | throw "log.setLevel() called with invalid level: " + level;
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182 | }
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183 | };
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184 |
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185 | self.setDefaultLevel = function (level) {
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186 | if (!getPersistedLevel()) {
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187 | self.setLevel(level, false);
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188 | }
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189 | };
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190 |
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191 | self.enableAll = function(persist) {
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192 | self.setLevel(self.levels.TRACE, persist);
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193 | };
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194 |
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195 | self.disableAll = function(persist) {
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196 | self.setLevel(self.levels.SILENT, persist);
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197 | };
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198 |
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199 |
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200 | var initialLevel = getPersistedLevel();
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201 | if (initialLevel == null) {
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202 | initialLevel = defaultLevel == null ? "WARN" : defaultLevel;
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203 | }
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204 | self.setLevel(initialLevel, false);
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205 | }
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206 |
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207 | |
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 | var defaultLogger = new Logger();
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214 |
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215 | var _loggersByName = {};
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216 | defaultLogger.getLogger = function getLogger(name) {
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217 | if (typeof name !== "string" || name === "") {
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218 | throw new TypeError("You must supply a name when creating a logger.");
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219 | }
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220 |
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221 | var logger = _loggersByName[name];
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222 | if (!logger) {
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223 | logger = _loggersByName[name] = new Logger(
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224 | name, defaultLogger.getLevel(), defaultLogger.methodFactory);
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225 | }
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226 | return logger;
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227 | };
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228 |
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229 |
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230 | var _log = (typeof window !== undefinedType) ? window.log : undefined;
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231 | defaultLogger.noConflict = function() {
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232 | if (typeof window !== undefinedType &&
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233 | window.log === defaultLogger) {
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234 | window.log = _log;
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235 | }
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236 |
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237 | return defaultLogger;
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238 | };
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239 |
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240 | defaultLogger.getLoggers = function getLoggers() {
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241 | return _loggersByName;
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242 | };
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243 |
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244 | return defaultLogger;
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245 | }));
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