/*
    --------------------------------------------------------------------------
    $Id: spamspan.js 5 2007-09-29 15:56:26Z moltar $
    --------------------------------------------------------------------------
    Version: 1.03
    Release date: 13/05/2006
    Last update: 07/01/2007

    (c) 2006 SpamSpan (www.spamspan.com)

    This program is distributed under the terms of the GNU General Public
    Licence version 2, available at http://www.gnu.org/licenses/gpl.txt
    --------------------------------------------------------------------------
*/

var spamSpanMainClass       = 'spamspan';
var spamSpanUserClass       = 'u';
var spamSpanDomainClass     = 'd';
var spamSpanAnchorTextClass = 't';
var spamSpanParams          = new Array('subject', 'body');

/*
    --------------------------------------------------------------------------
    Do not edit past this point unless you know what you are doing.
    --------------------------------------------------------------------------
*/

// load SpamSpan
addEvent(window, 'load', spamSpan);

function spamSpan() {
    var allSpamSpans = getElementsByClass(spamSpanMainClass, document, 'span');
    for (var i = 0; i < allSpamSpans.length; i++) {
        // get data
        var user = getSpanValue(spamSpanUserClass, allSpamSpans[i]);
        var domain = getSpanValue(spamSpanDomainClass, allSpamSpans[i]);
        var anchorText = getSpanValue(spamSpanAnchorTextClass, allSpamSpans[i]);
        // prepare parameter data
        var paramValues = new Array();
        for (var j = 0; j < spamSpanParams.length; j++) {
            var paramSpanValue = getSpanValue(spamSpanParams[j], allSpamSpans[i]);
            if (paramSpanValue) {
                paramValues.push(spamSpanParams[j] + '=' +
                    encodeURIComponent(paramSpanValue));
            }
        }
        // create new anchor tag
        var at = String.fromCharCode(32*2);
        var email = cleanSpan(user) + at + cleanSpan(domain);
        var anchorTagText = document.createTextNode(anchorText ? anchorText : email);
        var mto = String.fromCharCode(109,97,105,108,116,111,58);
        var hrefAttr = mto + email;
            hrefAttr += paramValues.length ? '?' + paramValues.join('&') : '';
        var anchorTag = document.createElement('a');
            anchorTag.className = spamSpanMainClass;
            anchorTag.setAttribute('href', hrefAttr);
            anchorTag.appendChild(anchorTagText);
        // replace the span with anchor
        allSpamSpans[i].parentNode.replaceChild(anchorTag, allSpamSpans[i]);
    }
}

function getElementsByClass(searchClass, scope, tag) {
    var classElements = new Array();
    if (scope == null) node = document;
    if (tag == null) tag = '*';
    var els = scope.getElementsByTagName(tag);
    var elsLen = els.length;
    var pattern = new RegExp("(^|\s)"+searchClass+"(\s|$)");
    for (var i = 0, j = 0; i < elsLen; i++) {
        if ( pattern.test(els[i].className) ) {
            classElements[j] = els[i];
            j++;
        }
    }
    return classElements;
}

function getSpanValue(searchClass, scope) {
    var span = getElementsByClass(searchClass, scope, 'span');
    if (span[0]) {
        return span[0].firstChild.nodeValue;
    } else {
        return false;
    }
}

function cleanSpan(string) {
    // string = string.replace(//g, '');
    // replace variations of [dot] with .
    string = string.replace(/[\[\(\{]?[dD][oO0][tT][\}\)\]]?/g, '.');
    // replace spaces with nothing
    string = string.replace(/\s+/g, '');
    return string;
}

// http://www.quirksmode.org/blog/archives/2005/10/_and_the_winner_1.html
function addEvent(obj, type, fn) {
    if (obj.addEventListener)
        obj.addEventListener(type, fn, false);
    else if (obj.attachEvent)
    {
        obj['e' + type + fn] = fn;
        obj[type + fn] = function() { obj['e' + type + fn](window.event); }
        obj.attachEvent('on' + type, obj[type + fn]);
    }
}