Javascript base_url

base_url.js

// return current page url
function current_url()
{
    return window.location.href;
}

// return current page path
function current_path()
{
    return window.location.pathname;
}

// return current page protocol
function get_protocol()
{
    return window.location.protocol;
}

// return any page anchors
function get_hash()
{
    return window.location.hash;
}

// return current page host
function get_host()
{
    return window.location.host;
}

// return current page hostname
function get_hostname()
{
    return window.location.hostname;
}

// return current page port
function get_port()
{
    return window.location.port;
}

// return any GET variables
function get_query_string()
{
    return window.location.search;
}

// returns the current site URL
// TODO: Check for ip6
function base_url(ext)
{
    var ret_url = '',
        url = current_url(),
        base = url.substring(0, url.indexOf('/', 14));

    // Base URL for localhost or IP
    if(base.indexOf(get_protocol()+'//localhost') != -1 || is_ip4(base.replace(get_protocol()+'//', ''))) {
        var pathname = current_path();
        var index1 = url.indexOf(pathname);
        var index2 = url.indexOf("/", index1 + 1);
        var base_local_url = url.substr(0, index2);

        ret_url = base_local_url + "/";
    } else {
        // Root URL for domain name
        ret_url = base + "/";
    }

    if(ext !== undefined && ext !== '') {
        ret_url += ext;
    }

    return ret_url;
}

// check if url is IPv4
function is_ip4(s)
{
    var match = s.match(/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/);

    return match !== null &&
           match[1] <= 255 && match[2] <= 255 &&
           match[3] <= 255 && match[4] <= 255;
}