(function ($) {

Drupal.extlink = Drupal.extlink || {};

Drupal.extlink.attach = function (context, settings) {
  // Strip the host name down, removing ports, subdomains, or www.
  var pattern = /^(([^\/:]+?\.)*)([^\.:]{4,})((\.[a-z]{1,4})*)(:[0-9]{1,5})?$/;
  var host = window.location.host.replace(pattern, '$3$4');
  var subdomain = window.location.host.replace(pattern, '$1');

  // Determine what subdomains are considered internal.
  var subdomains;
  if (settings.extlink.extSubdomains) {
    subdomains = "([^/]*\\.)?";
  }
  else if (subdomain == 'www.' || subdomain == '') {
    subdomains = "(www\\.)?";
  }
  else {
    subdomains = subdomain.replace(".", "\\.");
  }

  // Build regular expressions that define an internal link.
  var internal_link = new RegExp("^https?://" + subdomains + host, "i");

  // Extra internal link matching.
  var extInclude = false;
  if (settings.extlink.extInclude) {
    extInclude = new RegExp(settings.extlink.extInclude.replace(/\\/, '\\'));
  }

  // Extra external link matching.
  var extExclude = false;
  if (settings.extlink.extExclude) {
    extExclude = new RegExp(settings.extlink.extExclude.replace(/\\/, '\\'));
  }

  // Find all links which are NOT internal and begin with http (as opposed
  // to ftp://, javascript:, etc. other kinds of links.
  // In jQuery 1.1 and higher, we'd use a filter method here, but it is not
  // available in jQuery 1.0 (Drupal 5 default).
  var external_links = new Array();
  var mailto_links = new Array();
  var potential_links = $("a:not(." + settings.extlink.extClass + ", ." + settings.extlink.mailtoClass + "), area:not(." + settings.extlink.extClass + ", ." + settings.extlink.mailtoClass + ")", context);
  var length = potential_links.length;
  var i, link;
  for (i = 0; i < length; i++) {
    // The link in this case is a native Link object, which means the host has
    // already been appended by the browser, even for local links.
    link = potential_links[i];
    try {
      var url = link.href.toLowerCase();
      if (url.indexOf('http') == 0 && (!url.match(internal_link) || (extInclude && url.match(extInclude))) && !(extExclude && url.match(extExclude))) {
        external_links.push(link);
      }
      // Do not include area tags with begin with mailto: (this prohibits
      // icons from being added to image-maps).
      else if (this.tagName != 'AREA' && url.indexOf('mailto:') == 0) {
        mailto_links.push(link);
      }
    }
    // IE7 throws errors often when dealing with irregular links, such as:
    // <a href="node/10"></a> Empty tags.
    // <a href="http://user:pass@example.com">example</a> User:pass syntax.
    catch (error) {
      return false;
    }
  }
  if (settings.extlink.extClass) {
    Drupal.extlink.applyClassAndSpan(external_links, settings.extlink.extClass);
  }

  if (settings.extlink.mailtoClass) {
    Drupal.extlink.applyClassAndSpan(mailto_links, settings.extlink.mailtoClass);
  }

  if (settings.extlink.extTarget) {
    // Apply the target attribute to all links.
    $(external_links).attr('target', settings.extlink.extTarget);
  }

  if (settings.extlink.extAlert) {
    // Add pop-up click-through dialog.
    $(external_links).click(function(e) {
      return confirm(settings.extlink.extAlertText);
    });
  }

  // Work around for Internet Explorer box model problems.
  if (($.support && !($.support.boxModel === undefined) && !$.support.boxModel) || ($.browser.msie && parseInt($.browser.version) <= 7)) {
    $('span.ext, span.mailto').css('display', 'inline-block');
  }
};

/**
 * Apply a class and a trailing <span> to all links not containing images.
 *
 * @param links
 *   An array of DOM elements representing the links.
 * @param class_name
 *   The class to apply to the links.
 */
Drupal.extlink.applyClassAndSpan = function (links, class_name) {
  var $links_to_process;
  if (parseFloat($().jquery) < 1.2) {
    $links_to_process = $(links).not('[img]');
  }
  else {
    var links_with_images = $(links).find('img').parents('a');
    $links_to_process = $(links).not(links_with_images);
  }
  $links_to_process.addClass(class_name);
  var i;
  var length = $links_to_process.length;
  for (i = 0; i < length; i++) {
    var $link = $($links_to_process[i]);
    if ($link.css('display') == 'inline') {
      $link.after('<span class=' + class_name + '></span>');
    }
  }
};

Drupal.behaviors.extlink = Drupal.behaviors.extlink || {};
Drupal.behaviors.extlink.attach = function (context, settings) {
  // Backwards compatibility, for the benefit of modules overriding extlink
  // functionality by defining an "extlinkAttach" global function.
  if (typeof extlinkAttach === 'function') {
    extlinkAttach(context);
  }
  else {
    Drupal.extlink.attach(context, settings);
  }
};

})(jQuery);
;