/*
FlangeLib - A JavaScript library
adamv.com
Logging Module.
Inspired by Bob Ippolito's description of his logging module:
http://bob.pythonmac.org/archives/2005/07/03/bookmarklet-based-debugging/
*/
function LogItem(index, level, message){
this.index = index;
this.level = level;
this.message = message;
this.timestamp = new Date();
}
LogItem.prototype = {
toString: function(format){
var s;
format = format || "[{index}] {level}: {message}";
s = format.template({
index: this.index+1,
level: this.level,
message: this.message,
timestamp: this.timestamp
});
return s;
}
};
function Logging_baseLog(level, objs, sep){
Logging._log.push(
new LogItem(
Logging._logCount,
level,
Array.prototype.join.apply(objs, [sep])));
Logging._logCount++;
// Trim down the log size
if (Logging.maxSize)
while(Logging.maxSize < Logging._log.length) Logging._log.shift();
Logging.notifyListeners();
}
var Logging = {
maxSize: null,
_log: new Array(),
_listeners: new Array(),
_logCount : 0,
baseLog: Logging_baseLog,
log: Logging_baseLog.partial("Info"),
logDebug: Logging_baseLog.partial("Debug"),
logError: Logging_baseLog.partial("Error"),
clear: function(){
Logging._log = new Array();
// Logging._logCount = 0; // clearing the log doesn't reset the count in a session
Logging.notifyListeners();
},
addListener: function(f){
Logging._listeners.push(f)
},
removeListener: function(f){
Logging._listeners.remove(f)
},
notifyListeners: function(){
foreach(Logging._listeners, function(listener){
try{listener()}catch(e){}
});
},
bookmarklet_popup: function(log_size){
log_size = log_size || 15;
var popup = window.open("", "log_", "height=400,width=500,statusbar=yes,resizable=yes,scrollbars=yes");
if (popup.alreadyOpen)
return;
popup.alreadyOpen = true;
popup.document.open();
popup.document.write([
"",
"Flangelib Log",
"",
"",
"",
"",
""].join(""));
function f(){
var items = Logging._log.slice(-log_size);
items.reverse();
var logText = ""+
collect(items, function(item){
return item.toString("- {level} {message}
");
}
).join("\n") + "
";
popup.document.getElementById('log').innerHTML = ws_to_html(link_to_html(logText));
}
f();
Logging.addListener(f);
popup.logListener = f;
popup.document.close();
popup.defaultStatus="Flangelib Log Window";
},
bookmarklet: function(log_size){
log_size = log_size || 10;
alert(Logging._log.slice(-log_size).join("\n"));
}
};