source: trip-planner-front/node_modules/loglevel/lib/loglevel.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1/*
2* loglevel - https://github.com/pimterry/loglevel
3*
4* Copyright (c) 2013 Tim Perry
5* Licensed under the MIT license.
6*/
7(function (root, definition) {
8 "use strict";
9 if (typeof define === 'function' && define.amd) {
10 define(definition);
11 } else if (typeof module === 'object' && module.exports) {
12 module.exports = definition();
13 } else {
14 root.log = definition();
15 }
16}(this, function () {
17 "use strict";
18
19 // Slightly dubious tricks to cut down minimized file size
20 var noop = function() {};
21 var undefinedType = "undefined";
22 var isIE = (typeof window !== undefinedType) && (typeof window.navigator !== undefinedType) && (
23 /Trident\/|MSIE /.test(window.navigator.userAgent)
24 );
25
26 var logMethods = [
27 "trace",
28 "debug",
29 "info",
30 "warn",
31 "error"
32 ];
33
34 // Cross-browser bind equivalent that works at least back to IE6
35 function bindMethod(obj, methodName) {
36 var method = obj[methodName];
37 if (typeof method.bind === 'function') {
38 return method.bind(obj);
39 } else {
40 try {
41 return Function.prototype.bind.call(method, obj);
42 } catch (e) {
43 // Missing bind shim or IE8 + Modernizr, fallback to wrapping
44 return function() {
45 return Function.prototype.apply.apply(method, [obj, arguments]);
46 };
47 }
48 }
49 }
50
51 // Trace() doesn't print the message in IE, so for that case we need to wrap it
52 function traceForIE() {
53 if (console.log) {
54 if (console.log.apply) {
55 console.log.apply(console, arguments);
56 } else {
57 // In old IE, native console methods themselves don't have apply().
58 Function.prototype.apply.apply(console.log, [console, arguments]);
59 }
60 }
61 if (console.trace) console.trace();
62 }
63
64 // Build the best logging method possible for this env
65 // Wherever possible we want to bind, not wrap, to preserve stack traces
66 function realMethod(methodName) {
67 if (methodName === 'debug') {
68 methodName = 'log';
69 }
70
71 if (typeof console === undefinedType) {
72 return false; // No method possible, for now - fixed later by enableLoggingWhenConsoleArrives
73 } else if (methodName === 'trace' && isIE) {
74 return traceForIE;
75 } else if (console[methodName] !== undefined) {
76 return bindMethod(console, methodName);
77 } else if (console.log !== undefined) {
78 return bindMethod(console, 'log');
79 } else {
80 return noop;
81 }
82 }
83
84 // These private functions always need `this` to be set properly
85
86 function replaceLoggingMethods(level, loggerName) {
87 /*jshint validthis:true */
88 for (var i = 0; i < logMethods.length; i++) {
89 var methodName = logMethods[i];
90 this[methodName] = (i < level) ?
91 noop :
92 this.methodFactory(methodName, level, loggerName);
93 }
94
95 // Define log.log as an alias for log.debug
96 this.log = this.debug;
97 }
98
99 // In old IE versions, the console isn't present until you first open it.
100 // We build realMethod() replacements here that regenerate logging methods
101 function enableLoggingWhenConsoleArrives(methodName, level, loggerName) {
102 return function () {
103 if (typeof console !== undefinedType) {
104 replaceLoggingMethods.call(this, level, loggerName);
105 this[methodName].apply(this, arguments);
106 }
107 };
108 }
109
110 // By default, we use closely bound real methods wherever possible, and
111 // otherwise we wait for a console to appear, and then try again.
112 function defaultMethodFactory(methodName, level, loggerName) {
113 /*jshint validthis:true */
114 return realMethod(methodName) ||
115 enableLoggingWhenConsoleArrives.apply(this, arguments);
116 }
117
118 function Logger(name, defaultLevel, factory) {
119 var self = this;
120 var currentLevel;
121
122 var storageKey = "loglevel";
123 if (typeof name === "string") {
124 storageKey += ":" + name;
125 } else if (typeof name === "symbol") {
126 storageKey = undefined;
127 }
128
129 function persistLevelIfPossible(levelNum) {
130 var levelName = (logMethods[levelNum] || 'silent').toUpperCase();
131
132 if (typeof window === undefinedType || !storageKey) return;
133
134 // Use localStorage if available
135 try {
136 window.localStorage[storageKey] = levelName;
137 return;
138 } catch (ignore) {}
139
140 // Use session cookie as fallback
141 try {
142 window.document.cookie =
143 encodeURIComponent(storageKey) + "=" + levelName + ";";
144 } catch (ignore) {}
145 }
146
147 function getPersistedLevel() {
148 var storedLevel;
149
150 if (typeof window === undefinedType || !storageKey) return;
151
152 try {
153 storedLevel = window.localStorage[storageKey];
154 } catch (ignore) {}
155
156 // Fallback to cookies if local storage gives us nothing
157 if (typeof storedLevel === undefinedType) {
158 try {
159 var cookie = window.document.cookie;
160 var location = cookie.indexOf(
161 encodeURIComponent(storageKey) + "=");
162 if (location !== -1) {
163 storedLevel = /^([^;]+)/.exec(cookie.slice(location))[1];
164 }
165 } catch (ignore) {}
166 }
167
168 // If the stored level is not valid, treat it as if nothing was stored.
169 if (self.levels[storedLevel] === undefined) {
170 storedLevel = undefined;
171 }
172
173 return storedLevel;
174 }
175
176 /*
177 *
178 * Public logger API - see https://github.com/pimterry/loglevel for details
179 *
180 */
181
182 self.name = name;
183
184 self.levels = { "TRACE": 0, "DEBUG": 1, "INFO": 2, "WARN": 3,
185 "ERROR": 4, "SILENT": 5};
186
187 self.methodFactory = factory || defaultMethodFactory;
188
189 self.getLevel = function () {
190 return currentLevel;
191 };
192
193 self.setLevel = function (level, persist) {
194 if (typeof level === "string" && self.levels[level.toUpperCase()] !== undefined) {
195 level = self.levels[level.toUpperCase()];
196 }
197 if (typeof level === "number" && level >= 0 && level <= self.levels.SILENT) {
198 currentLevel = level;
199 if (persist !== false) { // defaults to true
200 persistLevelIfPossible(level);
201 }
202 replaceLoggingMethods.call(self, level, name);
203 if (typeof console === undefinedType && level < self.levels.SILENT) {
204 return "No console available for logging";
205 }
206 } else {
207 throw "log.setLevel() called with invalid level: " + level;
208 }
209 };
210
211 self.setDefaultLevel = function (level) {
212 if (!getPersistedLevel()) {
213 self.setLevel(level, false);
214 }
215 };
216
217 self.enableAll = function(persist) {
218 self.setLevel(self.levels.TRACE, persist);
219 };
220
221 self.disableAll = function(persist) {
222 self.setLevel(self.levels.SILENT, persist);
223 };
224
225 // Initialize with the right level
226 var initialLevel = getPersistedLevel();
227 if (initialLevel == null) {
228 initialLevel = defaultLevel == null ? "WARN" : defaultLevel;
229 }
230 self.setLevel(initialLevel, false);
231 }
232
233 /*
234 *
235 * Top-level API
236 *
237 */
238
239 var defaultLogger = new Logger();
240
241 var _loggersByName = {};
242 defaultLogger.getLogger = function getLogger(name) {
243 if ((typeof name !== "symbol" && typeof name !== "string") || name === "") {
244 throw new TypeError("You must supply a name when creating a logger.");
245 }
246
247 var logger = _loggersByName[name];
248 if (!logger) {
249 logger = _loggersByName[name] = new Logger(
250 name, defaultLogger.getLevel(), defaultLogger.methodFactory);
251 }
252 return logger;
253 };
254
255 // Grab the current global log variable in case of overwrite
256 var _log = (typeof window !== undefinedType) ? window.log : undefined;
257 defaultLogger.noConflict = function() {
258 if (typeof window !== undefinedType &&
259 window.log === defaultLogger) {
260 window.log = _log;
261 }
262
263 return defaultLogger;
264 };
265
266 defaultLogger.getLoggers = function getLoggers() {
267 return _loggersByName;
268 };
269
270 // ES6 default export, for compatibility
271 defaultLogger['default'] = defaultLogger;
272
273 return defaultLogger;
274}));
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