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/*
* loglevel - https://github.com/pimterry/loglevel
*
* Copyright (c) 2013 Tim Perry
* Licensed under the MIT license.
*/
(function (root, definition) {
"use strict";
if (typeof define === 'function' && define.amd) {
define(definition);
} else if (typeof module === 'object' && module.exports) {
module.exports = definition();
} else {
root.log = definition();
}
}(this, function () {
"use strict";
// Slightly dubious tricks to cut down minimized file size
var noop = function() {};
var undefinedType = "undefined";
var isIE = (typeof window !== undefinedType) && (typeof window.navigator !== undefinedType) && (
/Trident\/|MSIE /.test(window.navigator.userAgent)
);
var logMethods = [
"trace",
"debug",
"info",
"warn",
"error"
];
var _loggersByName = {};
var defaultLogger = null;
// Cross-browser bind equivalent that works at least back to IE6
function bindMethod(obj, methodName) {
var method = obj[methodName];
if (typeof method.bind === 'function') {
return method.bind(obj);
} else {
try {
return Function.prototype.bind.call(method, obj);
} catch (e) {
// Missing bind shim or IE8 + Modernizr, fallback to wrapping
return function() {
return Function.prototype.apply.apply(method, [obj, arguments]);
};
}
}
}
// Trace() doesn't print the message in IE, so for that case we need to wrap it
function traceForIE() {
if (console.log) {
if (console.log.apply) {
console.log.apply(console, arguments);
} else {
// In old IE, native console methods themselves don't have apply().
Function.prototype.apply.apply(console.log, [console, arguments]);
}
}
if (console.trace) console.trace();
}
// Build the best logging method possible for this env
// Wherever possible we want to bind, not wrap, to preserve stack traces
function realMethod(methodName) {
if (methodName === 'debug') {
methodName = 'log';
}
if (typeof console === undefinedType) {
return false; // No method possible, for now - fixed later by enableLoggingWhenConsoleArrives
} else if (methodName === 'trace' && isIE) {
return traceForIE;
} else if (console[methodName] !== undefined) {
return bindMethod(console, methodName);
} else if (console.log !== undefined) {
return bindMethod(console, 'log');
} else {
return noop;
}
}
// These private functions always need `this` to be set properly
function replaceLoggingMethods() {
/*jshint validthis:true */
var level = this.getLevel();
// Replace the actual methods.
for (var i = 0; i < logMethods.length; i++) {
var methodName = logMethods[i];
this[methodName] = (i < level) ?
noop :
this.methodFactory(methodName, level, this.name);
}
// Define log.log as an alias for log.debug
this.log = this.debug;
// Return any important warnings.
if (typeof console === undefinedType && level < this.levels.SILENT) {
return "No console available for logging";
}
}
// In old IE versions, the console isn't present until you first open it.
// We build realMethod() replacements here that regenerate logging methods
function enableLoggingWhenConsoleArrives(methodName) {
return function () {
if (typeof console !== undefinedType) {
replaceLoggingMethods.call(this);
this[methodName].apply(this, arguments);
}
};
}
// By default, we use closely bound real methods wherever possible, and
// otherwise we wait for a console to appear, and then try again.
function defaultMethodFactory(methodName, _level, _loggerName) {
/*jshint validthis:true */
return realMethod(methodName) ||
enableLoggingWhenConsoleArrives.apply(this, arguments);
}
function Logger(name, factory) {
// Private instance variables.
var self = this;
/**
* The level inherited from a parent logger (or a global default). We
* cache this here rather than delegating to the parent so that it stays
* in sync with the actual logging methods that we have installed (the
* parent could change levels but we might not have rebuilt the loggers
* in this child yet).
* @type {number}
*/
var inheritedLevel;
/**
* The default level for this logger, if any. If set, this overrides
* `inheritedLevel`.
* @type {number|null}
*/
var defaultLevel;
/**
* A user-specific level for this logger. If set, this overrides
* `defaultLevel`.
* @type {number|null}
*/
var userLevel;
var storageKey = "loglevel";
if (typeof name === "string") {
storageKey += ":" + name;
} else if (typeof name === "symbol") {
storageKey = undefined;
}
function persistLevelIfPossible(levelNum) {
var levelName = (logMethods[levelNum] || 'silent').toUpperCase();
if (typeof window === undefinedType || !storageKey) return;
// Use localStorage if available
try {
window.localStorage[storageKey] = levelName;
return;
} catch (ignore) {}
// Use session cookie as fallback
try {
window.document.cookie =
encodeURIComponent(storageKey) + "=" + levelName + ";";
} catch (ignore) {}
}
function getPersistedLevel() {
var storedLevel;
if (typeof window === undefinedType || !storageKey) return;
try {
storedLevel = window.localStorage[storageKey];
} catch (ignore) {}
// Fallback to cookies if local storage gives us nothing
if (typeof storedLevel === undefinedType) {
try {
var cookie = window.document.cookie;
var cookieName = encodeURIComponent(storageKey);
var location = cookie.indexOf(cookieName + "=");
if (location !== -1) {
storedLevel = /^([^;]+)/.exec(
cookie.slice(location + cookieName.length + 1)
)[1];
}
} catch (ignore) {}
}
// If the stored level is not valid, treat it as if nothing was stored.
if (self.levels[storedLevel] === undefined) {
storedLevel = undefined;
}
return storedLevel;
}
function clearPersistedLevel() {
if (typeof window === undefinedType || !storageKey) return;
// Use localStorage if available
try {
window.localStorage.removeItem(storageKey);
} catch (ignore) {}
// Use session cookie as fallback
try {
window.document.cookie =
encodeURIComponent(storageKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 UTC";
} catch (ignore) {}
}
function normalizeLevel(input) {
var level = input;
if (typeof level === "string" && self.levels[level.toUpperCase()] !== undefined) {
level = self.levels[level.toUpperCase()];
}
if (typeof level === "number" && level >= 0 && level <= self.levels.SILENT) {
return level;
} else {
throw new TypeError("log.setLevel() called with invalid level: " + input);
}
}
/*
*
* Public logger API - see https://github.com/pimterry/loglevel for details
*
*/
self.name = name;
self.levels = { "TRACE": 0, "DEBUG": 1, "INFO": 2, "WARN": 3,
"ERROR": 4, "SILENT": 5};
self.methodFactory = factory || defaultMethodFactory;
self.getLevel = function () {
if (userLevel != null) {
return userLevel;
} else if (defaultLevel != null) {
return defaultLevel;
} else {
return inheritedLevel;
}
};
self.setLevel = function (level, persist) {
userLevel = normalizeLevel(level);
if (persist !== false) { // defaults to true
persistLevelIfPossible(userLevel);
}
// NOTE: in v2, this should call rebuild(), which updates children.
return replaceLoggingMethods.call(self);
};
self.setDefaultLevel = function (level) {
defaultLevel = normalizeLevel(level);
if (!getPersistedLevel()) {
self.setLevel(level, false);
}
};
self.resetLevel = function () {
userLevel = null;
clearPersistedLevel();
replaceLoggingMethods.call(self);
};
self.enableAll = function(persist) {
self.setLevel(self.levels.TRACE, persist);
};
self.disableAll = function(persist) {
self.setLevel(self.levels.SILENT, persist);
};
self.rebuild = function () {
if (defaultLogger !== self) {
inheritedLevel = normalizeLevel(defaultLogger.getLevel());
}
replaceLoggingMethods.call(self);
if (defaultLogger === self) {
for (var childName in _loggersByName) {
_loggersByName[childName].rebuild();
}
}
};
// Initialize all the internal levels.
inheritedLevel = normalizeLevel(
defaultLogger ? defaultLogger.getLevel() : "WARN"
);
var initialLevel = getPersistedLevel();
if (initialLevel != null) {
userLevel = normalizeLevel(initialLevel);
}
replaceLoggingMethods.call(self);
}
/*
*
* Top-level API
*
*/
defaultLogger = new Logger();
defaultLogger.getLogger = function getLogger(name) {
if ((typeof name !== "symbol" && typeof name !== "string") || name === "") {
throw new TypeError("You must supply a name when creating a logger.");
}
var logger = _loggersByName[name];
if (!logger) {
logger = _loggersByName[name] = new Logger(
name,
defaultLogger.methodFactory
);
}
return logger;
};
// Grab the current global log variable in case of overwrite
var _log = (typeof window !== undefinedType) ? window.log : undefined;
defaultLogger.noConflict = function() {
if (typeof window !== undefinedType &&
window.log === defaultLogger) {
window.log = _log;
}
return defaultLogger;
};
defaultLogger.getLoggers = function getLoggers() {
return _loggersByName;
};
// ES6 default export, for compatibility
defaultLogger['default'] = defaultLogger;
return defaultLogger;
}));