User:Gerbrant/edit/multiReplace.js

From Wikipedia, the free encyclopedia

Note: After saving, you have to bypass your browser's cache to see the changes. In Internet Explorer and Firefox, hold down the Ctrl key and click the Refresh or Reload button. Opera users have to clear their caches through Tools→Preferences, see the instructions for Opera. Konqueror and Safari users can just click the Reload button. 

try
{
	"A".replace(/A|(B)/, function(a, b)
	{
		if(b != undefined) throw false;
		return a;
	});
}
catch(e)
{
	(function(m)
	{
		alert(m);
		throw new Error(m);
	})("The script Gerbrant.edit.multiReplace cannot be used because your browser's implementation of String.prototype.replace is buggy. More specifically, it doesn't handle non-participating capturing groups correctly.");
}
 
module("Gerbrant.edit.multiReplace", function()
{
 
patterns = [];
handlers = [];
indices = [];
var j = 1;
 
this.add = function(p, h)
{
	var n = p.match(/\((?!\?)/g);
	if(n) n = n.length + j;
	else n = j;
	patterns.push(p.replace(/\\(\d+)/, function(a, b)
	{
		return "\\" + (+b + n - 1);
	}));
	handlers.push(h);
	indices.push([j, ++n]);
	j = n;
}
 
//equivalent aan a.slice(b, e), maar dat werkt niet voor arguments
function sliceArg(a, b, e)
{
	n = [];
	while(b < e) n.push(a[b++]);
	return n;
}
 
this.handler = function(a)
{
	var i, idx;
	for(i in indices)
	{
		idx = indices[i];
		if(arguments[idx[0]] != undefined)
			try
			{
				return handlers[i].apply(a, sliceArg(arguments, idx[0], idx[1]));
			}
			catch(e)
			{
				alert(e.message + "\n\n" + handlers[i]);
				return a;
			}
	}
	throw "Failed sanity check.";
}
 
this.getRE = function()
{
	return new RegExp("(" + patterns.join(")|(") + ")", "g")
};
 
this.replace = function(t)
{
	return t.replace(this.getRE(), this.handler);
};
 
});