linkifier.js

// ==UserScript==
// @name    Linkifier
// @version     1.06
// @date        2008-10-10
// @author      Mike Samokhvalov <[email protected]>
// @download    http://www.puzzleclub.ru/files/linkifier.js
// ==/UserScript==

// By motive of Greasemonkey user script "Linkifier":
// http://userscripts.org/scripts/show/1024

(function(){
	///////////////////////////////////////////////////////////////////
	// SETTINGS
	var anchorAttribute = 'ujs_linkifier';
	// Anchor style. Examples:
	// 'text-decoration: overline !important;'
	// 'border-width: 1px 0 !important; border-style: dotted !important;'  
	// 'border-width: 1px 0 !important; border-style: dashed !important;'
	var anchorStyle = '';

	// END OF SETTINGS
	///////////////////////////////////////////////////////////////////

	///////////////////////////////////////////////////////////////////
	// DO NOT EDIT

	// Modified regular expression from http://regexlib.com/  
	var uriRe = /\b(?:(?:(?:file|gopher|news|nntp|telnet|http|ftp|https|ftps|sftp|irc):\/\/(?:[^:@\s\.\,\/\\]+(?::[^:@\s\.\,\/\\]+)?@)?)|(?:www\.|ftp\.|irc\.))(?:(?:[\w\.-]+\.[a-zA-Z]{2,6})|(?:[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(?:\:\d+)?(?:\/(?:[\w\-\.\?\!\,\'\/\\\+&%\$#\=~:;\[\]\(\)]+[\w\-\/\\\+&%\$#\=~]+)?)?/gi;
  
	var linkify = function(obj) {
		if(!obj) return;
	      
		if(obj.tagName.match(/^(a|head|meta|title|applet|object|param|embed|script|style|frameset|frame|iframe|textarea|input|button|select|option|img|map)$/i))
			return;

		if(obj.tagName == 'PRE' || obj.tagName == 'CODE') {
			obj.innerHTML = obj.innerHTML.replace(/(?:\r\n|\n|\r)/g, function(s){ return '\r\n'; });
		}

		var cn = obj.childNodes;
		for(var i = cn.length - 1; i >= 0; i--) {
			if(cn[i].nodeType == 1) {
				linkify(cn[i]);
			} else if(cn[i].nodeType == 3 && cn[i].nodeValue.match(uriRe)) {
				var v = cn[i].nodeValue.replace(/&/g, '&amp;');
				v = v.replace(/</g, '&lt;');
				v = v.replace(/>/g, '&gt;');
				v = v.replace(uriRe, function(s){          
						var url = s;
						if(url.indexOf('www.') == 0)
							url = 'http://' + url;
						else if(url.indexOf('ftp.') == 0)
							url = 'ftp://' + url;
						else if(url.indexOf('irc.') == 0)
							url = 'irc://' + url;
						return '<a href="' + url + '" ' + anchorAttribute + '="1">' + s + '</a>';
					});

				var s = document.createElement('span');
				document.documentElement.appendChild(s);
				cn[i].parentNode.replaceChild(s, cn[i]);          
				s.outerHTML = v;
			}
		}
	};
  
	var addStyle = function(css) {
		if(!document || !document.documentElement) return;
      
		var s = document.createElement('style');
		s.setAttribute('type', 'text/css');
		s.setAttribute('style', 'display:none !important;');			
		s.appendChild(document.createTextNode(css));
		document.documentElement.appendChild(s); 
	};
  
	if(anchorStyle)
        	addStyle('a[' + anchorAttribute + '] {' + anchorStyle + '}');
        
	linkify(document.body);
})();