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128 lines
4.2 KiB
JavaScript
128 lines
4.2 KiB
JavaScript
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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var LogController = {}; //create the logger object
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LogController.counter = 0; //current log message number
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LogController.listeners = [];
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LogController.logLevel = {
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FATAL: 50,
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ERROR: 40,
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WARNING: 30,
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INFO: 20,
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DEBUG: 10
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};
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/* set minimum logging level */
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LogController.logLevelAtLeast = function(minLevel) {
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if (typeof(minLevel) == 'string') {
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minLevel = LogController.logLevel[minLevel];
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}
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return function (msg) {
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var msgLevel = msg.level;
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if (typeof(msgLevel) == 'string') {
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msgLevel = LogController.logLevel[msgLevel];
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}
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return msgLevel >= minLevel;
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};
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};
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/* creates the log message with the given level and info */
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LogController.createLogMessage = function(level, info) {
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var msg = {};
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msg.num = LogController.counter;
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msg.level = level;
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msg.info = info;
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msg.timestamp = new Date();
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return msg;
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};
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/* helper method to return a sub-array */
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LogController.extend = function (args, skip) {
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var ret = [];
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for (var i = skip; i<args.length; i++) {
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ret.push(args[i]);
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}
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return ret;
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};
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/* logs message with given level. Currently used locally by log() and error() */
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LogController.logWithLevel = function(level, message/*, ...*/) {
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var msg = LogController.createLogMessage(
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level,
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LogController.extend(arguments, 1)
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);
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LogController.dispatchListeners(msg);
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LogController.counter += 1;
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};
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/* log with level INFO */
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LogController.log = function(message/*, ...*/) {
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LogController.logWithLevel('INFO', message);
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};
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/* log with level ERROR */
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LogController.error = function(message/*, ...*/) {
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LogController.logWithLevel('ERROR', message);
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};
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/* send log message to listeners */
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LogController.dispatchListeners = function(msg) {
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for (var k in LogController.listeners) {
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var pair = LogController.listeners[k];
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if (pair.ident != k || (pair[0] && !pair[0](msg))) {
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continue;
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}
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pair[1](msg);
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}
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};
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/* add a listener to this log given an identifier, a filter (can be null) and the listener object */
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LogController.addListener = function(ident, filter, listener) {
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if (typeof(filter) == 'string') {
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filter = LogController.logLevelAtLeast(filter);
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} else if (filter !== null && typeof(filter) !== 'function') {
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throw new Error("Filter must be a string, a function, or null");
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}
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var entry = [filter, listener];
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entry.ident = ident;
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LogController.listeners[ident] = entry;
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};
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/* remove a listener from this log */
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LogController.removeListener = function(ident) {
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delete LogController.listeners[ident];
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};
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