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