/*
  @author: remy sharp / http://remysharp.com
  @url: http://remysharp.com/2008/04/01/wiki-to-html-using-javascript/
  @license: Creative Commons License - ShareAlike http://creativecommons.org/licenses/by-sa/3.0/
  @version: 1.0
  
  Can extend String or be used stand alone - just change the flag at the top of the script.
*/

(function () {
    
var extendString = true;

if (extendString) {
    String.prototype.wiki2html = wiki2html;
    String.prototype.iswiki = iswiki;
} else {
    window.wiki2html = wiki2html;
    window.iswiki = iswiki;
}

// utility function to check whether it's worth running through the wiki2html
function iswiki(s) {
    if (extendString) {
        s = this;
    }

    return !!(s.match(/^[\s{2} `#\*='{2}]/m));
}

// the regex beast...
function wiki2html(s) {
    if (extendString) {
        s = this;
    }
    
    // lists need to be done using a function to allow for recusive calls
    function list(str) {
        return str.replace(/(?:(?:(?:^|\n)[\*#].*)+)/g, function (m) {  // (?=[\*#])
            var type = m.match(/(^|\n)#/) ? 'OL' : 'UL';
            // strip first layer of list
            m = m.replace(/(^|\n)[\*#][ ]{0,1}/g, "$1");
            m = list(m);
            return '<' + type + '><li>' + m.replace(/^\n/, '').split(/\n/).join('</li><li>') + '</li></' + type + '>';
        });
    }
    
    return list(s
        
        /* BLOCK ELEMENTS */
        .replace(/(?:^|\n+)([^# =\*<].+)(?:\n+|$)/gm, function (m, l) {
            if (l.match(/^\^+$/)) return l;
            return "\n<p>" + l + "</p>\n";
        })

        .replace(/(?:^|\n)[ ]{2}(.*)+/g, function (m, l) { // blockquotes
            if (l.match(/^\s+$/)) return m;
            return '<blockquote>' + l + '</pre>';
        })
        
        .replace(/((?:^|\n)[ ]+.*)+/g, function (m) { // code
            if (m.match(/^\s+$/)) return m;
            return '<pre>' + m.replace(/(^|\n)[ ]+/g, "$1") + '</pre>';
        })

        .replace(/(?:^|\n)([=]+)(.*)\1/g, function (m, l, t) { // headings
            return '<h' + l.length + '>' + t + '</h' + l.length + '>';
        })
    
        /* INLINE ELEMENTS */
        .replace(/'''(.*?)'''/g, function (m, l) { // bold
            return '<strong>' + l + '</strong>';
        })
    
        .replace(/''(.*?)''/g, function (m, l) { // italic
            return '<em>' + l + '</em>';
        })
    
        .replace(/[^\[](http[^\[\s]*)/g, function (m, l) { // normal link
            return '<a href="' + l + '">' + l + '</a>';
        })
    
        .replace(/[\[](http.*)[!\]]/g, function (m, l) { // external link
            var p = l.replace(/[\[\]]/g, '').split(/ /);
            var link = p.shift();
            return '<a href="' + link + '">' + (p.length ? p.join(' ') : link) + '</a>';
        })
    
        .replace(/\[\[(.*?)\]\]/g, function (m, l) { // internal link or image
            var p = l.split(/\|/);
            var link = p.shift();

            if (link.match(/^Image:(.*)/)) {
                // no support for images - since it looks up the source from the wiki db :-(
                return m;
            } else {
                return '<a href="' + link + '">' + (p.length ? p.join('|') : link) + '</a>';
            }
        })
    ); 
}
    
})();