ivanzotov/constructor

var ru = {
    'а':'a', 'б':'b', 'в':'v', 'г':'g', 'д':'d', 'е':'e', 'ё':'yo', 'ж':'zh',
    'з':'z', 'и':'i', 'й':'y', 'к':'k', 'л':'l', 'м':'m', 'н':'n', 'о':'o',
    'п':'p', 'р':'r', 'с':'s', 'т':'t', 'у':'u', 'ф':'f', 'х':'h', 'ц':'ts',
    'ч':'ch', 'ш':'sh', 'щ':'sch', 'ъ':'', 'ы':'y', 'ь':'', 'э':'e', 'ю':'yu',
    'я':'ya',
    'А':'A', 'Б':'B', 'В':'V', 'Г':'G', 'Д':'D', 'Е':'E', 'Ё':'Yo', 'Ж':'Zh',
    'З':'Z', 'И':'I', 'Й':'J', 'К':'K', 'Л':'L', 'М':'M', 'Н':'N', 'О':'O',
    'П':'P', 'Р':'R', 'С':'S', 'Т':'T', 'У':'U', 'Ф':'F', 'Х':'H', 'Ц':'Ts',
    'Ч':'Ch', 'Ш':'Sh', 'Щ':'Sch', 'Ъ':'', 'Ы':'Y', 'Ь':'', 'Э':'E', 'Ю':'Yu',
    'Я':'Ya'
}

var ALL_DOWNCODE_MAPS=new Array()

ALL_DOWNCODE_MAPS[0] = ru

var Downcoder = new Object();
Downcoder.Initialize = function()
{
    if (Downcoder.map) // already made
        return ;
    Downcoder.map ={}
    Downcoder.chars = '' ;
    for(var i in ALL_DOWNCODE_MAPS)
    {
        var lookup = ALL_DOWNCODE_MAPS[i]
        for (var c in lookup)
        {
            Downcoder.map[c] = lookup[c] ;
            Downcoder.chars += c ;
        }
     }
    Downcoder.regex = new RegExp('[' + Downcoder.chars + ']|[^' + Downcoder.chars + ']+','g') ;
}

downcode= function( slug )
{
    Downcoder.Initialize() ;
    var downcoded =""
    var pieces = slug.match(Downcoder.regex);
    if(pieces)
    {
        for (var i = 0 ; i < pieces.length ; i++)
        {
            if (pieces[i].length == 1)
            {
                var mapped = Downcoder.map[pieces[i]] ;
                if (mapped != null)
                {
                    downcoded+=mapped;
                    continue ;
                }
            }
            downcoded+=pieces[i];
        }
    }
    else
    {
        downcoded = slug;
    }
    return downcoded;
}

function URLify(s, num_chars) {
    // changes, e.g., "Petty theft" to "petty_theft"
    // remove all these words from the string before urlifying
    s = downcode(s);
    s = s.replace(/[^-\w\s]/g, '-');  // remove unneeded chars
    s = s.replace(/^\s+|\s+$/g, ''); // trim leading/trailing spaces
    s = s.replace(/[-\s]+/g, '-');   // convert spaces to hyphens
    s = s.replace(/^-+|-+$/g, '');   // trim leading/trailing hyphens
    s = s.toLowerCase();             // convert to lowercase
    return s.substring(0, num_chars);// trim to first num_chars chars
}