Logging for JavaScript

Lgz.js

var Lgz = function(lgStr) {
	var fn, msg, console = window.console || null;
	var splitPos = lgStr.indexOf(':'), len = lgStr.length;
	
	
	var fnMap = {
		'i' : 'info',
		'e' : 'error',
		'w' : 'warn',
		'l' : 'log'
	};
	
	var rLsplit = /^([^:]*)(?=:)/;
	var rRsplit = /(?=:).*$/;
	
	if ( len == 0 ) return;
	
	// 'message'
	if ( splitPos < 0 )	console.log(lgStr);
	// ':message'
	else if ( splitPos == 0 && len != (splitPos+1)) console.log(lgStr.slice(1));
	// 'info:'
	else if ( len == (splitPos+1) ) return;
	// 'log:message'
	else {
	
		fn = lgStr.match(rLsplit)[0];
		
		if ( fn.length == 1) {
			fn = fnMap[fn];
			if ( fn == undefined ) fn = 'log';
		}
		
		msg = lgStr.match(rRsplit)[0].split(':')[1];
		
		console[fn](msg);
	}	
}