translate.js

(function() {

	var translate = function(text)
	{
		var xlate = translateLookup(text);
		
		if (typeof xlate == "function")
		{
			xlate = xlate.apply(this, arguments);
		}
		else if (arguments.length > 1)
		{
			var aps = Array.prototype.slice;
			var args = aps.call( arguments, 1 );
  
			xlate = formatter(xlate, args);
		}
		
		return xlate;
	};
	
	// I want it available explicity as well as via the object
	translate.translate = translate;
	
	//from https://gist.github.com/776196 via http://davedash.com/2010/11/19/pythonic-string-formatting-in-javascript/ 
	var defaultFormatter = (function() {
		var re = /\{([^}]+)\}/g;
		return function(s, args) {
			return s.replace(re, function(_, match){ return args[match]; });
		};
	}());
	var formatter = defaultFormatter;
	translate.setFormatter = function(newFormatter)
	{
		formatter = newFormatter;
	};
	
	translate.format = function()
	{
		var aps = Array.prototype.slice;
		var s = arguments[0];
		var args = aps.call( arguments, 1 );
  
		return formatter(s, args);
	};

	var dynoTrans = null;
	translate.setDynamicTranslator = function(newDynoTrans)
	{
		dynoTrans = newDynoTrans;
	};

	var translation = null;
	translate.setTranslation = function(newTranslation)
	{
		translation = newTranslation;
	};
	
	function translateLookup(target)
	{
		if (translation == null || target == null)
		{
			return target;
		}
		
		if (target in translation === false)
		{
			if (dynoTrans != null)
			{
				return dynoTrans(target);
			}
			return target;
		}
		
		var result = translation[target];
		if (result == null)
		{
			return target;
		}
		
		return result;
	}
	
	window._ = translate;

})();