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(function ($) {

/**
 * Attach the machine-readable name form element behavior.
 */
Drupal.behaviors.machineName = {
  /**
   * Attaches the behavior.
   *
   * @param settings.machineName
   *   A list of elements to process, keyed by the HTML ID of the form element
   *   containing the human-readable value. Each element is an object defining
   *   the following properties:
   *   - target: The HTML ID of the machine name form element.
   *   - suffix: The HTML ID of a container to show the machine name preview in
   *     (usually a field suffix after the human-readable name form element).
   *   - label: The label to show for the machine name preview.
   *   - replace_pattern: A regular expression (without modifiers) matching
   *     disallowed characters in the machine name; e.g., '[^a-z0-9]+'.
   *   - replace: A character to replace disallowed characters with; e.g., '_'
   *     or '-'.
   *   - standalone: Whether the preview should stay in its own element rather
   *     than the suffix of the source element.
   *   - field_prefix: The #field_prefix of the form element.
   *   - field_suffix: The #field_suffix of the form element.
   */
  attach: function (context, settings) {
    var self = this;
    $.each(settings.machineName, function (source_id, options) {
      var $source = $(source_id, context).addClass('machine-name-source');
      var $target = $(options.target, context).addClass('machine-name-target');
      var $suffix = $(options.suffix, context);
      var $wrapper = $target.closest('.form-item');
      // All elements have to exist.
      if (!$source.length || !$target.length || !$suffix.length || !$wrapper.length) {
        return;
      }
      // Skip processing upon a form validation error on the machine name.
      if ($target.hasClass('error')) {
        return;
      }
      // Figure out the maximum length for the machine name.
      options.maxlength = $target.attr('maxlength');
      // Hide the form item container of the machine name form element.
      $wrapper.hide();
      // Determine the initial machine name value. Unless the machine name form
      // element is disabled or not empty, the initial default value is based on
      // the human-readable form element value.
      if ($target.is(':disabled') || $target.val() != '') {
        var machine = $target.val();
      }
      else {
        var machine = self.transliterate($source.val(), options);
      }
      // Append the machine name preview to the source field.
      var $preview = $('<span class="machine-name-value">' + options.field_prefix + Drupal.checkPlain(machine) + options.field_suffix + '</span>');
      $suffix.empty();
      if (options.label) {
        $suffix.append(' ').append('<span class="machine-name-label">' + options.label + ':</span>');
      }
      $suffix.append(' ').append($preview);

      // If the machine name cannot be edited, stop further processing.
      if ($target.is(':disabled')) {
        return;
      }

      // If it is editable, append an edit link.
      var $link = $('<span class="admin-link"><a href="#">' + Drupal.t('Edit') + '</a></span>')
        .click(function () {
          $wrapper.show();
          $target.focus();
          $suffix.hide();
          $source.unbind('.machineName');
          return false;
        });
      $suffix.append(' ').append($link);

      // Preview the machine name in realtime when the human-readable name
      // changes, but only if there is no machine name yet; i.e., only upon
      // initial creation, not when editing.
      if ($target.val() == '') {
        $source.bind('keyup.machineName change.machineName input.machineName', function () {
          machine = self.transliterate($(this).val(), options);
          // Set the machine name to the transliterated value.
          if (machine != '') {
            if (machine != options.replace) {
              $target.val(machine);
              $preview.html(options.field_prefix + Drupal.checkPlain(machine) + options.field_suffix);
            }
            $suffix.show();
          }
          else {
            $suffix.hide();
            $target.val(machine);
            $preview.empty();
          }
        });
        // Initialize machine name preview.
        $source.keyup();
      }
    });
  },

  /**
   * Transliterate a human-readable name to a machine name.
   *
   * @param source
   *   A string to transliterate.
   * @param settings
   *   The machine name settings for the corresponding field, containing:
   *   - replace_pattern: A regular expression (without modifiers) matching
   *     disallowed characters in the machine name; e.g., '[^a-z0-9]+'.
   *   - replace: A character to replace disallowed characters with; e.g., '_'
   *     or '-'.
   *   - maxlength: The maximum length of the machine name.
   *
   * @return
   *   The transliterated source string.
   */
  transliterate: function (source, settings) {
    var rx = new RegExp(settings.replace_pattern, 'g');
    return source.toLowerCase().replace(rx, settings.replace).substr(0, settings.maxlength);
  }
};

})(jQuery);