CanvasBlocker/lib/logging.js

/* eslint no-console: off */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
(function(){
	"use strict";
	
	var scope;
	if ((typeof exports) !== "undefined"){
		scope = exports;
	}
	else {
		if (!window.scope.logging){
			window.scope.logging = {};
		}
		scope = window.scope.logging;
	}

	const settings = require("./settings");
	
	var prefix = "";
	
	function leftPad(str, char, pad){
		str = "" + str;
		return char.repeat(pad - str.length) + str;
	}
	
	var queue = [];
	function performLog(level, args, date){
		if (!date){
			date = new Date();
		}
		if (settings.isStillDefault || queue.length){
			queue.push({level, args, date});
		}
		else {
			if (settings.logLevel >= level){
				var pre = "";
				if (prefix){
					pre = prefix + ": ";
				}
				pre += "[" +
					date.getFullYear() + "-" +
					leftPad(date.getMonth() + 1, "0", 2) + "-" +
					leftPad(date.getDate(), "0", 2) + " " +
					leftPad(date.getHours(), "0", 2) + ":" +
					leftPad(date.getMinutes(), "0", 2) + ":" +
					leftPad(date.getSeconds(), "0", 2) + "." +
					leftPad(date.getMilliseconds(), "0", 3) +
					"]";
				if (typeof args[0] === "string"){
					args[0] = pre + " " + args[0];
				}
				else {
					args.unshift(pre);
				}
				console.log.apply(console, args);
			}
		}
	}
	
	function error  (...args){performLog(1, args);}
	function warning(...args){performLog(25, args);}
	function message(...args){performLog(50, args);}
	function notice (...args){performLog(75, args);}
	function verbose(...args){performLog(100, args);}
	function metaLog(...args){performLog(999, args);}
	
	scope.setPrefix = function(newPrefix){
		if (!prefix){
			prefix = newPrefix;
		}
		else {
			warning("logging prefix already set (%s) cannot be set to %s", prefix, newPrefix);
		}
	};
	scope.clearQueue = function(){
		if (queue.length){
			metaLog("clear logging queue");
			var tmp = queue;
			queue = [];
			tmp.forEach(function(item){
				performLog(item.level, item.args, item.date);
			});
			metaLog("logging queue cleared");
		}
	};
	settings.loaded.then(scope.clearQueue);
	scope.error = error;
	scope.warning = warning;
	scope.message = message;
	scope.notice = notice;
	scope.verbose = verbose;

	require.emit("./logging");

	metaLog("logging available");
}());