/*

Anti-Spam Email Links 1.7
=========================
by Andrew Gregory
http://www.scss.com.au/family/andrew/webdesign/emaillinks/

This work is licensed under the Creative Commons Attribution License. To view a
copy of this license, visit http://creativecommons.org/licenses/by/1.0/ or send
a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305,
USA.

IMPORTANT NOTE:
Variables and functions with names starting with an underscore (_) are
'internal' and not to be used.

*/

// search for (with subject "subject") in the element text and use the text
// inside the double quotes as the email subject
function emaillinks_subject(text, link) {
	var subject = emaillinks_config.subj.exec(text);
	if (subject) {
		link.setAttribute('href', link.getAttribute('href') + '?subject=' + subject[1]);
	}
}

// Process the element
function _emaillinks_process(ele) {
	var i, r, title, newText;
	var cfg = emaillinks_config;
	var node = ele.childNodes[0];
	// get recipient name and obfuscated email address
	var txtLink = node.nodeType == 3;
	var imgLink = node.nodeType == 1 && node.tagName.toLowerCase() == 'img';
	var text = null;
	if (txtLink) text = node.nodeValue;
	if (imgLink) text = node.getAttribute('alt');
	if (!text) return;
	var name = (cfg.name) ? cfg.name.exec(text) : null;
	var addr = (cfg.addr) ? cfg.addr.exec(text) : null;
	if (addr) {
		title = ele.getAttribute('title');
		// un-obfuscate email address
		addr = addr[1];
		if (cfg.unobs) {
			for (i = 0; i < cfg.unobs.length; i++) {
				r = cfg.unobs[i];
				addr = addr.replace(r.re, r.txt);
			}
		}
		// set link text
		newText = (name) ? name[1] : (!title) ? addr : title;
		if (txtLink) node.nodeValue = newText;
		if (imgLink) node.setAttribute('alt', newText);
		// set link address
		ele.setAttribute('href', 'mailto:' + addr);
		// last minute processing
		if (cfg.process) {
			for (i = 0; i < cfg.process.length; i++) {
				cfg.process[i](text, ele);
			}
		}
	}
}

// Process selected elements with the configured class name
function _emaillinks_processAll() {
	var className = (emaillinks_config.className) ? emaillinks_config.className : 'email';
	var i, ele, eles = document.getElementsByTagName('a');
	for (i = 0; i < eles.length; i++) {
		ele = eles[i];
		if (ele.className && ele.className == className && !ele.getAttribute('href')) {
			_emaillinks_process(ele);
		}
	}
}

// default configuration
var emaillinks_config = {
	className:'emailAddress',
	addr:/<([^>]*)>/,
	name:/"([^"]*)"/,
	subj:/with subject "([^"]*)"/,
	process:[emaillinks_subject],
	unobs:[
		{re:/\s+at\s+/ig , txt:'@'},
		{re:/\s+dot\s+/ig, txt:'.'},
		{re:/\s+-at-\s+/ig , txt:'@'},
		{re:/\s+-dot-\s+/ig, txt:'.'},
		{re:/\s+\(at\)\s+/ig , txt:'@'},
		{re:/\s+\(dot\)\s+/ig, txt:'.'},
		{re:/[\.]?invalid$/i, txt:''},
		{re:/\s+/g, txt:''}
	]
};

// process emails when the document finishes loading
YAHOO.util.Event.addListener(window,'load',_emaillinks_processAll);