C:/drupal/includes/theme.inc

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<?php
// $Id: theme.inc,v 1.424 2008/05/26 17:12:54 dries Exp $

define('MARK_READ', 0);

define('MARK_NEW', 1);

define('MARK_UPDATED', 2);

function init_theme() {
  global $theme, $user, $custom_theme, $theme_key;

  // If $theme is already set, assume the others are set, too, and do nothing
  if (isset($theme)) {
    return;
  }

  drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
  $themes = list_themes();

  // Only select the user selected theme if it is available in the
  // list of enabled themes.
  $theme = !empty($user->theme) && !empty($themes[$user->theme]->status) ? $user->theme : variable_get('theme_default', 'garland');

  // Allow modules to override the present theme... only select custom theme
  // if it is available in the list of installed themes.
  $theme = $custom_theme && $themes[$custom_theme] ? $custom_theme : $theme;

  // Store the identifier for retrieving theme settings with.
  $theme_key = $theme;

  // Find all our ancestor themes and put them in an array.
  $base_theme = array();
  $ancestor = $theme;
  while ($ancestor && isset($themes[$ancestor]->base_theme)) {
    $base_theme[] = $new_base_theme = $themes[$themes[$ancestor]->base_theme];
    $ancestor = $themes[$ancestor]->base_theme;
  }
  _init_theme($themes[$theme], array_reverse($base_theme));
}

function _init_theme($theme, $base_theme = array(), $registry_callback = '_theme_load_registry') {
  global $theme_info, $base_theme_info, $theme_engine, $theme_path;
  $theme_info = $theme;
  $base_theme_info = $base_theme;

  $theme_path = dirname($theme->filename);

  // Prepare stylesheets from this theme as well as all ancestor themes.
  // We work it this way so that we can have child themes override parent
  // theme stylesheets easily.
  $final_stylesheets = array();

  // Grab stylesheets from base theme
  foreach ($base_theme as $base) {
    if (!empty($base->stylesheets)) {
      foreach ($base->stylesheets as $media => $stylesheets) {
        foreach ($stylesheets as $name => $stylesheet) {
          $final_stylesheets[$media][$name] = $stylesheet;
        }
      }
    }
  }

  // Add stylesheets used by this theme.
  if (!empty($theme->stylesheets)) {
    foreach ($theme->stylesheets as $media => $stylesheets) {
      foreach ($stylesheets as $name => $stylesheet) {
        $final_stylesheets[$media][$name] = $stylesheet;
      }
    }
  }

  // And now add the stylesheets properly
  foreach ($final_stylesheets as $media => $stylesheets) {
    foreach ($stylesheets as $stylesheet) {
      drupal_add_css($stylesheet, 'theme', $media);
    }
  }

  // Do basically the same as the above for scripts
  $final_scripts = array();

  // Grab scripts from base theme
  foreach ($base_theme as $base) {
    if (!empty($base->scripts)) {
      foreach ($base->scripts as $name => $script) {
        $final_scripts[$name] = $script;
      }
    }
  }

  // Add scripts used by this theme.
  if (!empty($theme->scripts)) {
    foreach ($theme->scripts as $name => $script) {
      $final_scripts[$name] = $script;
    }
  }

  // Add scripts used by this theme.
  foreach ($final_scripts as $script) {
    drupal_add_js($script, 'theme');
  }

  $theme_engine = NULL;

  // Initialize the theme.
  if (isset($theme->engine)) {
    // Include the engine.
    include_once './' . $theme->owner;

    $theme_engine = $theme->engine;
    if (function_exists($theme_engine . '_init')) {
      foreach ($base_theme as $base) {
        call_user_func($theme_engine . '_init', $base);
      }
      call_user_func($theme_engine . '_init', $theme);
    }
  }
  else {
    // include non-engine theme files
    foreach ($base_theme as $base) {
      // Include the theme file or the engine.
      if (!empty($base->owner)) {
        include_once './' . $base->owner;
      }
    }
    // and our theme gets one too.
    if (!empty($theme->owner)) {
      include_once './' . $theme->owner;
    }
  }

  if (drupal_function_exists($registry_callback)) {
    $registry_callback($theme, $base_theme, $theme_engine);
  }
}

function theme_get_registry($registry = NULL) {
  static $theme_registry = NULL;
  if (isset($registry)) {
    $theme_registry = $registry;
  }

  return $theme_registry;
}

function _theme_set_registry($registry) {
  // Pass through for setting of static variable.
  return theme_get_registry($registry);
}

function _theme_load_registry($theme, $base_theme = NULL, $theme_engine = NULL) {
  // Check the theme registry cache; if it exists, use it.
  $cache = cache_get("theme_registry:$theme->name", 'cache');
  if (isset($cache->data)) {
    $registry = $cache->data;
  }
  else {
    // If not, build one and cache it.
    $registry = _theme_build_registry($theme, $base_theme, $theme_engine);
    _theme_save_registry($theme, $registry);
  }
  _theme_set_registry($registry);
}

function _theme_save_registry($theme, $registry) {
  cache_set("theme_registry:$theme->name", $registry);
}

function drupal_rebuild_theme_registry() {
  cache_clear_all('theme_registry', 'cache', TRUE);
}

function _theme_process_registry(&$cache, $name, $type, $theme, $path) {
  $function = $name . '_theme';
  if (function_exists($function)) {
    $result = $function($cache, $type, $theme, $path);

    foreach ($result as $hook => $info) {
      $result[$hook]['type'] = $type;
      $result[$hook]['theme path'] = $path;
      // if function and file are left out, default to standard naming
      // conventions.
      if (!isset($info['template']) && !isset($info['function'])) {
        $result[$hook]['function'] = ($type == 'module' ? 'theme_' : $name . '_') . $hook;
      }
      // If a path is set in the info, use what was set. Otherwise use the
      // default path. This is mostly so system.module can declare theme
      // functions on behalf of core .include files.
      // All files are included to be safe. Conditionally included
      // files can prevent them from getting registered.
      if (isset($info['file']) && !isset($info['path'])) {
        $result[$hook]['file'] = $path . '/' . $info['file'];
        include_once($result[$hook]['file']);
      }
      elseif (isset($info['file']) && isset($info['path'])) {
        include_once($info['path'] . '/' . $info['file']);
      }

      if (isset($info['template']) && !isset($info['path'])) {
        $result[$hook]['template'] = $path . '/' . $info['template'];
      }
      // If 'arguments' have been defined previously, carry them forward.
      // This should happen if a theme overrides a Drupal defined theme
      // function, for example.
      if (!isset($info['arguments']) && isset($cache[$hook])) {
        $result[$hook]['arguments'] = $cache[$hook]['arguments'];
      }
      // Likewise with theme paths. These are used for template naming suggestions.
      // Theme implementations can occur in multiple paths. Suggestions should follow.
      if (!isset($info['theme paths']) && isset($cache[$hook])) {
        $result[$hook]['theme paths'] = $cache[$hook]['theme paths'];
      }
      // Check for sub-directories.
      $result[$hook]['theme paths'][] = isset($info['path']) ? $info['path'] : $path;

      // Check for default _preprocess_ functions. Ensure arrayness.
      if (!isset($info['preprocess functions']) || !is_array($info['preprocess functions'])) {
        $info['preprocess functions'] = array();
        $prefixes = array();
        if ($type == 'module') {
          // Default preprocessor prefix.
          $prefixes[] = 'template';
          // Add all modules so they can intervene with their own preprocessors. This allows them
          // to provide preprocess functions even if they are not the owner of the current hook.
          $prefixes += module_list();
        }
        elseif ($type == 'theme_engine') {
          // Theme engines get an extra set that come before the normally named preprocessors.
          $prefixes[] = $name . '_engine';
          // The theme engine also registers on behalf of the theme. The theme or engine name can be used.
          $prefixes[] = $name;
          $prefixes[] = $theme;
        }
        else {
          // This applies when the theme manually registers their own preprocessors.
          $prefixes[] = $name;
        }

        foreach ($prefixes as $prefix) {
          if (function_exists($prefix . '_preprocess')) {
            $info['preprocess functions'][] = $prefix . '_preprocess';
          }
          if (function_exists($prefix . '_preprocess_' . $hook)) {
            $info['preprocess functions'][] = $prefix . '_preprocess_' . $hook;
          }
        }
      }
      // Check for the override flag and prevent the cached preprocess functions from being used.
      // This allows themes or theme engines to remove preprocessors set earlier in the registry build.
      if (!empty($info['override preprocess functions'])) {
        // Flag not needed inside the registry.
        unset($result[$hook]['override preprocess functions']);
      }
      elseif (isset($cache[$hook]['preprocess functions']) && is_array($cache[$hook]['preprocess functions'])) {
        $info['preprocess functions'] = array_merge($cache[$hook]['preprocess functions'], $info['preprocess functions']);
      }
      $result[$hook]['preprocess functions'] = $info['preprocess functions'];
    }

    // Merge the newly created theme hooks into the existing cache.
    $cache = array_merge($cache, $result);
  }
}

function _theme_build_registry($theme, $base_theme, $theme_engine) {
  $cache = array();
  // First, process the theme hooks advertised by modules. This will
  // serve as the basic registry.
  foreach (module_implements('theme') as $module) {
    _theme_process_registry($cache, $module, 'module', $module, drupal_get_path('module', $module));
  }

  // Process each base theme.
  foreach ($base_theme as $base) {
    // If the theme uses a theme engine, process its hooks.
    $base_path = dirname($base->filename);
    if ($theme_engine) {
      _theme_process_registry($cache, $theme_engine, 'base_theme_engine', $base->name, $base_path);
    }
    _theme_process_registry($cache, $base->name, 'base_theme', $base->name, $base_path);
  }

  // And then the same thing, but for the theme.
  if ($theme_engine) {
    _theme_process_registry($cache, $theme_engine, 'theme_engine', $theme->name, dirname($theme->filename));
  }

  // Finally, hooks provided by the theme itself.
  _theme_process_registry($cache, $theme->name, 'theme', $theme->name, dirname($theme->filename));

  // Let modules alter the registry
  drupal_alter('theme_registry', $cache);
  return $cache;
}

function list_themes($refresh = FALSE) {
  static $list = array();

  if ($refresh) {
    $list = array();
  }

  if (empty($list)) {
    $list = array();
    $themes = array();
    // Extract from the database only when it is available.
    // Also check that the site is not in the middle of an install or update.
    if (db_is_active() && !defined('MAINTENANCE_MODE')) {
      $result = db_query("SELECT * FROM {system} WHERE type = '%s'", 'theme');
      while ($theme = db_fetch_object($result)) {
        if (file_exists($theme->filename)) {
          $theme->info = unserialize($theme->info);
          $themes[] = $theme;
        }
      }
    }
    else {
      // Scan the installation when the database should not be read.
      $themes = _system_theme_data();
    }

    foreach ($themes as $theme) {
      foreach ($theme->info['stylesheets'] as $media => $stylesheets) {
        foreach ($stylesheets as $stylesheet => $path) {
          if (file_exists($path)) {
            $theme->stylesheets[$media][$stylesheet] = $path;
          }
        }
      }
      foreach ($theme->info['scripts'] as $script => $path) {
        if (file_exists($path)) {
          $theme->scripts[$script] = $path;
        }
      }
      if (isset($theme->info['engine'])) {
        $theme->engine = $theme->info['engine'];
      }
      if (isset($theme->info['base theme'])) {
        $theme->base_theme = $theme->info['base theme'];
      }
      // Status is normally retrieved from the database. Add zero values when
      // read from the installation directory to prevent notices.
      if (!isset($theme->status)) {
        $theme->status = 0;
      }
      $list[$theme->name] = $theme;
    }
  }

  return $list;
}

function theme() {
  $args = func_get_args();
  $hook = array_shift($args);

  static $hooks = NULL;
  if (!isset($hooks)) {
    init_theme();
    $hooks = theme_get_registry();
  }

  if (is_array($hook)) {
    foreach ($hook as $candidate) {
      if (isset($hooks[$candidate])) {
        break;
      }
    }
    $hook = $candidate;
  }

  if (!isset($hooks[$hook])) {
    return;
  }

  $info = $hooks[$hook];
  global $theme_path;
  $temp = $theme_path;
  // point path_to_theme() to the currently used theme path:
  $theme_path = $info['theme path'];

  // Include a file if the theme function or preprocess function is held elsewhere.
  if (!empty($info['file'])) {
    $include_file = $info['file'];
    if (isset($info['path'])) {
      $include_file = $info['path'] . '/' . $include_file;
    }
    include_once($include_file);
  }
  if (isset($info['function'])) {
    // The theme call is a function.
    $output = call_user_func_array($info['function'], $args);
  }
  else {
    // The theme call is a template.
    $variables = array(
      'template_files' => array()
    );
    if (!empty($info['arguments'])) {
      $count = 0;
      foreach ($info['arguments'] as $name => $default) {
        $variables[$name] = isset($args[$count]) ? $args[$count] : $default;
        $count++;
      }
    }

    // default render function and extension.
    $render_function = 'theme_render_template';
    $extension = '.tpl.php';

    // Run through the theme engine variables, if necessary
    global $theme_engine;
    if (isset($theme_engine)) {
      // If theme or theme engine is implementing this, it may have
      // a different extension and a different renderer.
      if ($info['type'] != 'module') {
        if (function_exists($theme_engine . '_render_template')) {
          $render_function = $theme_engine . '_render_template';
        }
        $extension_function = $theme_engine . '_extension';
        if (function_exists($extension_function)) {
          $extension = $extension_function();
        }
      }
    }

    if (isset($info['preprocess functions']) && is_array($info['preprocess functions'])) {
      // This construct ensures that we can keep a reference through
      // call_user_func_array.
      $args = array(&$variables, $hook);
      foreach ($info['preprocess functions'] as $preprocess_function) {
        if (drupal_function_exists($preprocess_function)) {
          call_user_func_array($preprocess_function, $args);
        }
      }
    }

    // Get suggestions for alternate templates out of the variables
    // that were set. This lets us dynamically choose a template
    // from a list. The order is FILO, so this array is ordered from
    // least appropriate first to most appropriate last.
    $suggestions = array();

    if (isset($variables['template_files'])) {
      $suggestions = $variables['template_files'];
    }
    if (isset($variables['template_file'])) {
      $suggestions[] = $variables['template_file'];
    }

    if ($suggestions) {
      $template_file = drupal_discover_template($info['theme paths'], $suggestions, $extension);
    }

    if (empty($template_file)) {
      $template_file = $info['template'] . $extension;
      if (isset($info['path'])) {
        $template_file = $info['path'] . '/' . $template_file;
      }
    }
    $output = $render_function($template_file, $variables);
  }
  // restore path_to_theme()
  $theme_path = $temp;
  return $output;
}

function drupal_discover_template($paths, $suggestions, $extension = '.tpl.php') {
  global $theme_engine;

  // Loop through all paths and suggestions in FIFO order.
  $suggestions = array_reverse($suggestions);
  $paths = array_reverse($paths);
  foreach ($suggestions as $suggestion) {
    if (!empty($suggestion)) {
      foreach ($paths as $path) {
        if (file_exists($file = $path . '/' . $suggestion . $extension)) {
          return $file;
        }
      }
    }
  }
}

function path_to_theme() {
  global $theme_path;

  if (!isset($theme_path)) {
    init_theme();
  }

  return $theme_path;
}

function drupal_find_theme_functions($cache, $prefixes) {
  $templates = array();
  $functions = get_defined_functions();

  foreach ($cache as $hook => $info) {
    foreach ($prefixes as $prefix) {
      if (!empty($info['pattern'])) {
        $matches = preg_grep('/^' . $prefix . '_' . $info['pattern'] . '/', $functions['user']);
        if ($matches) {
          foreach ($matches as $match) {
            $new_hook = str_replace($prefix . '_', '', $match);
            $templates[$new_hook] = array(
              'function' => $match,
              'arguments' => $info['arguments'],
            );
          }
        }
      }
      if (function_exists($prefix . '_' . $hook)) {
        $templates[$hook] = array(
          'function' => $prefix . '_' . $hook,
        );
      }
    }
  }

  return $templates;
}

function drupal_find_theme_templates($cache, $extension, $path) {
  $templates = array();

  // Collect paths to all sub-themes grouped by base themes. These will be
  // used for filtering. This allows base themes to have sub-themes in its
  // folder hierarchy without affecting the base themes template discovery.
  $theme_paths = array();
  foreach (list_themes() as $theme_info) {
    if (!empty($theme_info->base_theme)) {
      $theme_paths[$theme_info->base_theme][$theme_info->name] = dirname($theme_info->filename);
    }
  }
  foreach ($theme_paths as $basetheme => $subthemes) {
    foreach ($subthemes as $subtheme => $subtheme_path) {
      if (isset($theme_paths[$subtheme])) {
        $theme_paths[$basetheme] = array_merge($theme_paths[$basetheme], $theme_paths[$subtheme]);
      }
    }
  }
  global $theme;
  $subtheme_paths = isset($theme_paths[$theme]) ? $theme_paths[$theme] : array();

  // Escape the periods in the extension.
  $regex = str_replace('.', '\.', $extension) . '$';
  // Because drupal_system_listing works the way it does, we check for real
  // templates separately from checking for patterns.
  $files = drupal_system_listing($regex, $path, 'name', 0);
  foreach ($files as $template => $file) {
    // Ignore sub-theme templates for the current theme.
    if (strpos($file->filename, str_replace($subtheme_paths, '', $file->filename)) !== 0) {
      continue;
    }
    // Chop off the remaining extensions if there are any. $template already
    // has the rightmost extension removed, but there might still be more,
    // such as with .tpl.php, which still has .tpl in $template at this point.
    if (($pos = strpos($template, '.')) !== FALSE) {
      $template = substr($template, 0, $pos);
    }
    // Transform - in filenames to _ to match function naming scheme
    // for the purposes of searching.
    $hook = strtr($template, '-', '_');
    if (isset($cache[$hook])) {
      $templates[$hook] = array(
        'template' => $template,
        'path' => dirname($file->filename),
      );
    }
  }

  $patterns = array_keys($files);

  foreach ($cache as $hook => $info) {
    if (!empty($info['pattern'])) {
      // Transform _ in pattern to - to match file naming scheme
      // for the purposes of searching.
      $pattern = strtr($info['pattern'], '_', '-');

      $matches = preg_grep('/^' . $pattern . '/', $patterns);
      if ($matches) {
        foreach ($matches as $match) {
          $file = substr($match, 0, strpos($match, '.'));
          // Put the underscores back in for the hook name and register this pattern.
          $templates[strtr($file, '-', '_')] = array(
            'template' => $file,
            'path' => dirname($files[$match]->filename),
            'arguments' => $info['arguments'],
          );
        }
      }
    }
  }
  return $templates;
}

function theme_get_settings($key = NULL) {
  $defaults = array(
    'mission'                       =>  '',
    'default_logo'                  =>  1,
    'logo_path'                     =>  '',
    'default_favicon'               =>  1,
    'favicon_path'                  =>  '',
    'primary_links'                 =>  1,
    'secondary_links'               =>  1,
    'toggle_logo'                   =>  1,
    'toggle_favicon'                =>  1,
    'toggle_name'                   =>  1,
    'toggle_search'                 =>  1,
    'toggle_slogan'                 =>  0,
    'toggle_mission'                =>  1,
    'toggle_node_user_picture'      =>  0,
    'toggle_comment_user_picture'   =>  0,
    'toggle_primary_links'          =>  1,
    'toggle_secondary_links'        =>  1,
  );

  if (module_exists('node')) {
    foreach (node_get_types() as $type => $name) {
      $defaults['toggle_node_info_' . $type] = 1;
    }
  }
  $settings = array_merge($defaults, variable_get('theme_settings', array()));

  if ($key) {
    $settings = array_merge($settings, variable_get(str_replace('/', '_', 'theme_' . $key . '_settings'), array()));
  }

  // Only offer search box if search.module is enabled.
  if (!module_exists('search') || !user_access('search content')) {
    $settings['toggle_search'] = 0;
  }

  return $settings;
}

function theme_get_setting($setting_name, $refresh = FALSE) {
  global $theme_key;
  static $settings;

  if (empty($settings) || $refresh) {
    $settings = theme_get_settings($theme_key);

    $themes = list_themes();
    $theme_object = $themes[$theme_key];

    if ($settings['mission'] == '') {
      $settings['mission'] = variable_get('site_mission', '');
    }

    if (!$settings['toggle_mission']) {
      $settings['mission'] = '';
    }

    if ($settings['toggle_logo']) {
      if ($settings['default_logo']) {
        $settings['logo'] = base_path() . dirname($theme_object->filename) . '/logo.png';
      }
      elseif ($settings['logo_path']) {
        $settings['logo'] = base_path() . $settings['logo_path'];
      }
    }

    if ($settings['toggle_favicon']) {
      if ($settings['default_favicon']) {
        if (file_exists($favicon = dirname($theme_object->filename) . '/favicon.ico')) {
          $settings['favicon'] = base_path() . $favicon;
        }
        else {
          $settings['favicon'] = base_path() . 'misc/favicon.ico';
        }
      }
      elseif ($settings['favicon_path']) {
        $settings['favicon'] = base_path() . $settings['favicon_path'];
      }
      else {
        $settings['toggle_favicon'] = FALSE;
      }
    }
  }

  return isset($settings[$setting_name]) ? $settings[$setting_name] : NULL;
}

function theme_render_template($file, $variables) {
  extract($variables, EXTR_SKIP);  // Extract the variables to a local namespace
  ob_start();                      // Start output buffering
  include "./$file";               // Include the file
  $contents = ob_get_contents();   // Get the contents of the buffer
  ob_end_clean();                  // End buffering and discard
  return $contents;                // Return the contents
}

function theme_placeholder($text) {
  return '<em>' . check_plain($text) . '</em>';
}

function theme_status_messages($display = NULL) {
  $output = '';
  foreach (drupal_get_messages($display) as $type => $messages) {
    $output .= "<div class=\"messages $type\">\n";
    if (count($messages) > 1) {
      $output .= " <ul>\n";
      foreach ($messages as $message) {
        $output .= '  <li>' . $message . "</li>\n";
      }
      $output .= " </ul>\n";
    }
    else {
      $output .= $messages[0];
    }
    $output .= "</div>\n";
  }
  return $output;
}

function theme_links($links, $attributes = array('class' => 'links')) {
  $output = '';

  if (count($links) > 0) {
    $output = '<ul' . drupal_attributes($attributes) . '>';

    $num_links = count($links);
    $i = 1;

    foreach ($links as $key => $link) {
      $class = $key;

      // Add first, last and active classes to the list of links to help out themers.
      if ($i == 1) {
        $class .= ' first';
      }
      if ($i == $num_links) {
        $class .= ' last';
      }
      if (isset($link['href']) && ($link['href'] == $_GET['q'] || ($link['href'] == '<front>' && drupal_is_front_page()))) {
        $class .= ' active';
      }
      $output .= '<li class="' . $class . '">';

      if (isset($link['href'])) {
        // Pass in $link as $options, they share the same keys.
        $output .= l($link['title'], $link['href'], $link);
      }
      else if (!empty($link['title'])) {
        // Some links are actually not links, but we wrap these in <span> for adding title and class attributes
        if (empty($link['html'])) {
          $link['title'] = check_plain($link['title']);
        }
        $span_attributes = '';
        if (isset($link['attributes'])) {
          $span_attributes = drupal_attributes($link['attributes']);
        }
        $output .= '<span' . $span_attributes . '>' . $link['title'] . '</span>';
      }

      $i++;
      $output .= "</li>\n";
    }

    $output .= '</ul>';
  }

  return $output;
}

function theme_image($path, $alt = '', $title = '', $attributes = NULL, $getsize = TRUE) {
  if (!$getsize || (is_file($path) && (list($width, $height, $type, $image_attributes) = @getimagesize($path)))) {
    $attributes = drupal_attributes($attributes);
    $url = (url($path) == $path) ? $path : (base_path() . $path);
    return '<img src="' . check_url($url) . '" alt="' . check_plain($alt) . '" title="' . check_plain($title) . '" ' . (isset($image_attributes) ? $image_attributes : '') . $attributes . ' />';
  }
}

function theme_breadcrumb($breadcrumb) {
  if (!empty($breadcrumb)) {
    return '<div class="breadcrumb">' . implode(' » ', $breadcrumb) . '</div>';
  }
}

function theme_help() {
  if ($help = menu_get_active_help()) {
    return '<div class="help">' . $help . '</div>';
  }
}

function theme_submenu($links) {
  return '<div class="submenu">' . implode(' | ', $links) . '</div>';
}

function theme_table($header, $rows, $attributes = array(), $caption = NULL, $colgroups = array()) {

  // Add sticky headers, if applicable.
  if (count($header)) {
    drupal_add_js('misc/tableheader.js');
    // Add 'sticky-enabled' class to the table to identify it for JS.
    // This is needed to target tables constructed by this function.
    $attributes['class'] = empty($attributes['class']) ? 'sticky-enabled' : ($attributes['class'] . ' sticky-enabled');
  }

  $output = '<table' . drupal_attributes($attributes) . ">\n";

  if (isset($caption)) {
    $output .= '<caption>' . $caption . "</caption>\n";
  }

  // Format the table columns:
  if (count($colgroups)) {
    foreach ($colgroups as $number => $colgroup) {
      $attributes = array();

      // Check if we're dealing with a simple or complex column
      if (isset($colgroup['data'])) {
        foreach ($colgroup as $key => $value) {
          if ($key == 'data') {
            $cols = $value;
          }
          else {
            $attributes[$key] = $value;
          }
        }
      }
      else {
        $cols = $colgroup;
      }

      // Build colgroup
      if (is_array($cols) && count($cols)) {
        $output .= ' <colgroup' . drupal_attributes($attributes) . '>';
        $i = 0;
        foreach ($cols as $col) {
          $output .= ' <col' . drupal_attributes($col) . ' />';
        }
        $output .= " </colgroup>\n";
      }
      else {
        $output .= ' <colgroup' . drupal_attributes($attributes) . " />\n";
      }
    }
  }

  // Format the table header:
  if (count($header)) {
    $ts = tablesort_init($header);
    // HTML requires that the thead tag has tr tags in it follwed by tbody
    // tags. Using ternary operator to check and see if we have any rows.
    $output .= (count($rows) ? ' <thead><tr>' : ' <tr>');
    foreach ($header as $cell) {
      $cell = tablesort_header($cell, $header, $ts);
      $output .= _theme_table_cell($cell, TRUE);
    }
    // Using ternary operator to close the tags based on whether or not there are rows
    $output .= (count($rows) ? " </tr></thead>\n" : "</tr>\n");
  }
  else {
    $ts = array();
  }

  // Format the table rows:
  if (count($rows)) {
    $output .= "<tbody>\n";
    $flip = array('even' => 'odd', 'odd' => 'even');
    $class = 'even';
    foreach ($rows as $number => $row) {
      $attributes = array();

      // Check if we're dealing with a simple or complex row
      if (isset($row['data'])) {
        foreach ($row as $key => $value) {
          if ($key == 'data') {
            $cells = $value;
          }
          else {
            $attributes[$key] = $value;
          }
        }
      }
      else {
        $cells = $row;
      }
      if (count($cells)) {
        // Add odd/even class
        $class = $flip[$class];
        if (isset($attributes['class'])) {
          $attributes['class'] .= ' ' . $class;
        }
        else {
          $attributes['class'] = $class;
        }

        // Build row
        $output .= ' <tr' . drupal_attributes($attributes) . '>';
        $i = 0;
        foreach ($cells as $cell) {
          $cell = tablesort_cell($cell, $header, $ts, $i++);
          $output .= _theme_table_cell($cell);
        }
        $output .= " </tr>\n";
      }
    }
    $output .= "</tbody>\n";
  }

  $output .= "</table>\n";
  return $output;
}

function theme_table_select_header_cell() {
  drupal_add_js('misc/tableselect.js');

  return array('class' => 'select-all');
}

function theme_tablesort_indicator($style) {
  if ($style == "asc") {
    return theme('image', 'misc/arrow-asc.png', t('sort icon'), t('sort ascending'));
  }
  else {
    return theme('image', 'misc/arrow-desc.png', t('sort icon'), t('sort descending'));
  }
}

function theme_box($title, $content, $region = 'main') {
  $output = '<h2 class="title">' . $title . '</h2><div>' . $content . '</div>';
  return $output;
}

function theme_mark($type = MARK_NEW) {
  global $user;
  if ($user->uid) {
    if ($type == MARK_NEW) {
      return ' <span class="marker">' . t('new') . '</span>';
    }
    else if ($type == MARK_UPDATED) {
      return ' <span class="marker">' . t('updated') . '</span>';
    }
  }
}

function theme_item_list($items = array(), $title = NULL, $type = 'ul', $attributes = NULL) {
  $output = '<div class="item-list">';
  if (isset($title)) {
    $output .= '<h3>' . $title . '</h3>';
  }

  if (!empty($items)) {
    $output .= "<$type" . drupal_attributes($attributes) . '>';
    $num_items = count($items);
    foreach ($items as $i => $item) {
      $attributes = array();
      $children = array();
      if (is_array($item)) {
        foreach ($item as $key => $value) {
          if ($key == 'data') {
            $data = $value;
          }
          elseif ($key == 'children') {
            $children = $value;
          }
          else {
            $attributes[$key] = $value;
          }
        }
      }
      else {
        $data = $item;
      }
      if (count($children) > 0) {
        $data .= theme_item_list($children, NULL, $type, $attributes); // Render nested list
      }
      if ($i == 0) {
        $attributes['class'] = empty($attributes['class']) ? 'first' : ($attributes['class'] . ' first');
      }
      if ($i == $num_items - 1) {
        $attributes['class'] = empty($attributes['class']) ? 'last' : ($attributes['class'] . ' last');
      }
      $output .= '<li' . drupal_attributes($attributes) . '>' . $data . "</li>\n";
    }
    $output .= "</$type>";
  }
  $output .= '</div>';
  return $output;
}

function theme_more_help_link($url) {
  return '<div class="more-help-link">' . t('<a href="@link">More help</a>', array('@link' => check_url($url))) . '</div>';
}

function theme_xml_icon($url) {
  if ($image = theme('image', 'misc/xml.png', t('XML feed'), t('XML feed'))) {
    return '<a href="' . check_url($url) . '" class="xml-icon">' . $image . '</a>';
  }
}

function theme_feed_icon($url, $title) {
  if ($image = theme('image', 'misc/feed.png', t('Syndicate content'), $title)) {
    return '<a href="' . check_url($url) . '" class="feed-icon">' . $image . '</a>';
  }
}

function theme_more_link($url, $title) {
  return '<div class="more-link">' . t('<a href="@link" title="@title">more</a>', array('@link' => check_url($url), '@title' => $title)) . '</div>';
}

function theme_closure($main = 0) {
  $footer = module_invoke_all('footer', $main);
  return implode("\n", $footer) . drupal_get_js('footer');
}

function theme_blocks($region) {
  $output = '';

  if ($list = block_list($region)) {
    foreach ($list as $key => $block) {
      // $key == <i>module</i>_<i>delta</i>
      $output .= theme('block', $block);
    }
  }

  // Add any content assigned to this region through drupal_set_content() calls.
  $output .= drupal_get_content($region);

  return $output;
}

function theme_username($object) {

  if ($object->uid && $object->name) {
    // Shorten the name when it is too long or it will break many tables.
    if (drupal_strlen($object->name) > 20) {
      $name = drupal_substr($object->name, 0, 15) . '...';
    }
    else {
      $name = $object->name;
    }

    if (user_access('access user profiles')) {
      $output = l($name, 'user/' . $object->uid, array('attributes' => array('title' => t('View user profile.'))));
    }
    else {
      $output = check_plain($name);
    }
  }
  else if ($object->name) {
    // Sometimes modules display content composed by people who are
    // not registered members of the site (e.g. mailing list or news
    // aggregator modules). This clause enables modules to display
    // the true author of the content.
    if (!empty($object->homepage)) {
      $output = l($object->name, $object->homepage, array('attributes' => array('rel' => 'nofollow')));
    }
    else {
      $output = check_plain($object->name);
    }

    $output .= ' (' . t('not verified') . ')';
  }
  else {
    $output = variable_get('anonymous', t('Anonymous'));
  }

  return $output;
}

function theme_progress_bar($percent, $message) {
  $output = '<div id="progress" class="progress">';
  $output .= '<div class="bar"><div class="filled" style="width: ' . $percent . '%"></div></div>';
  $output .= '<div class="percentage">' . $percent . '%</div>';
  $output .= '<div class="message">' . $message . '</div>';
  $output .= '</div>';

  return $output;
}

function theme_indentation($size = 1) {
  $output = '';
  for ($n = 0; $n < $size; $n++) {
    $output .= '<div class="indentation">&nbsp;</div>';
  }
  return $output;
}

function _theme_table_cell($cell, $header = FALSE) {
  $attributes = '';

  if (is_array($cell)) {
    $data = isset($cell['data']) ? $cell['data'] : '';
    $header |= isset($cell['header']);
    unset($cell['data']);
    unset($cell['header']);
    $attributes = drupal_attributes($cell);
  }
  else {
    $data = $cell;
  }

  if ($header) {
    $output = "<th$attributes>$data</th>";
  }
  else {
    $output = "<td$attributes>$data</td>";
  }

  return $output;
}

function template_preprocess(&$variables, $hook) {
  global $user;
  static $count = array();

  // Track run count for each hook to provide zebra striping.
  // See "template_preprocess_block()" which provides the same feature specific to blocks.
  $count[$hook] = isset($count[$hook]) && is_int($count[$hook]) ? $count[$hook] : 1;
  $variables['zebra'] = ($count[$hook] % 2) ? 'odd' : 'even';
  $variables['id'] = $count[$hook]++;

  // Tell all templates where they are located.
  $variables['directory'] = path_to_theme();

  // Set default variables that depend on the database.
  $variables['is_admin']            = FALSE;
  $variables['is_front']            = FALSE;
  $variables['logged_in']           = FALSE;
  if ($variables['db_is_active'] = db_is_active()  && !defined('MAINTENANCE_MODE')) {
    // Check for administrators.
    if (user_access('access administration pages')) {
      $variables['is_admin'] = TRUE;
    }
    // Flag front page status.
    $variables['is_front'] = drupal_is_front_page();
    // Tell all templates by which kind of user they're viewed.
    $variables['logged_in'] = ($user->uid > 0);
    // Provide user object to all templates
    $variables['user'] = $user;
  }
}

function template_preprocess_page(&$variables) {
  // Add favicon
  if (theme_get_setting('toggle_favicon')) {
    drupal_set_html_head('<link rel="shortcut icon" href="' . check_url(theme_get_setting('favicon')) . '" type="image/x-icon" />');
  }

  global $theme;
  // Populate all block regions.
  $regions = system_region_list($theme);
  // Load all region content assigned via blocks.
  foreach (array_keys($regions) as $region) {
    // Prevent left and right regions from rendering blocks when 'show_blocks' == FALSE.
    if (!(!$variables['show_blocks'] && ($region == 'left' || $region == 'right'))) {
      $blocks = theme('blocks', $region);
    }
    else {
      $blocks = '';
    }
    // Assign region to a region variable.
    isset($variables[$region]) ? $variables[$region] .= $blocks : $variables[$region] = $blocks;
  }

  // Set up layout variable.
  $variables['layout'] = 'none';
  if (!empty($variables['left'])) {
    $variables['layout'] = 'left';
  }
  if (!empty($variables['right'])) {
    $variables['layout'] = ($variables['layout'] == 'left') ? 'both' : 'right';
  }

  // Set mission when viewing the frontpage.
  if (drupal_is_front_page()) {
    $mission = filter_xss_admin(theme_get_setting('mission'));
  }

  // Construct page title
  if (drupal_get_title()) {
    $head_title = array(strip_tags(drupal_get_title()), variable_get('site_name', 'Drupal'));
  }
  else {
    $head_title = array(variable_get('site_name', 'Drupal'));
    if (variable_get('site_slogan', '')) {
      $head_title[] = variable_get('site_slogan', '');
    }
  }
  $variables['head_title']        = implode(' | ', $head_title);
  $variables['base_path']         = base_path();
  $variables['front_page']        = url();
  $variables['breadcrumb']        = theme('breadcrumb', drupal_get_breadcrumb());
  $variables['feed_icons']        = drupal_get_feeds();
  $variables['footer_message']    = filter_xss_admin(variable_get('site_footer', FALSE));
  $variables['head']              = drupal_get_html_head();
  $variables['help']              = theme('help');
  $variables['language']          = $GLOBALS['language'];
  $variables['language']->dir     = $GLOBALS['language']->direction ? 'rtl' : 'ltr';
  $variables['logo']              = theme_get_setting('logo');
  $variables['messages']          = $variables['show_messages'] ? theme('status_messages') : '';
  $variables['mission']           = isset($mission) ? $mission : '';
  $variables['primary_links']     = theme_get_setting('toggle_primary_links') ? menu_primary_links() : array();
  $variables['secondary_links']   = theme_get_setting('toggle_secondary_links') ? menu_secondary_links() : array();
  $variables['search_box']        = (theme_get_setting('toggle_search') ? drupal_get_form('search_theme_form') : '');
  $variables['site_name']         = (theme_get_setting('toggle_name') ? variable_get('site_name', 'Drupal') : '');
  $variables['site_slogan']       = (theme_get_setting('toggle_slogan') ? variable_get('site_slogan', '') : '');
  $variables['css']               = drupal_add_css();
  $variables['styles']            = drupal_get_css();
  $variables['scripts']           = drupal_get_js();
  $variables['tabs']              = theme('menu_local_tasks');
  $variables['title']             = drupal_get_title();
  // Closure should be filled last.
  $variables['closure']           = theme('closure');

  if ($node = menu_get_object()) {
    $variables['node'] = $node;
  }

  // Compile a list of classes that are going to be applied to the body element.
  // This allows advanced theming based on context (home page, node of certain type, etc.).
  $body_classes = array();
  // Add a class that tells us whether we're on the front page or not.
  $body_classes[] = $variables['is_front'] ? 'front' : 'not-front';
  // Add a class that tells us whether the page is viewed by an authenticated user or not.
  $body_classes[] = $variables['logged_in'] ? 'logged-in' : 'not-logged-in';
  // Add arg(0) to make it possible to theme the page depending on the current page
  // type (e.g. node, admin, user, etc.). To avoid illegal characters in the class,
  // we're removing everything disallowed. We are not using 'a-z' as that might leave
  // in certain international characters (e.g. German umlauts).
  $body_classes[] = preg_replace('![^abcdefghijklmnopqrstuvwxyz0-9-_]+!s', '', 'page-' . form_clean_id(drupal_strtolower(arg(0))));
  // If on an individual node page, add the node type.
  if (isset($variables['node']) && $variables['node']->type) {
    $body_classes[] = 'node-type-' . form_clean_id($variables['node']->type);
  }
  // Add information about the number of sidebars.
  if ($variables['layout'] == 'both') {
    $body_classes[] = 'two-sidebars';
  }
  elseif ($variables['layout'] == 'none') {
    $body_classes[] = 'no-sidebars';
  }
  else {
    $body_classes[] = 'one-sidebar sidebar-' . $variables['layout'];
  }
  // Implode with spaces.
  $variables['body_classes'] = implode(' ', $body_classes);

  // Build a list of suggested template files in order of specificity. One
  // suggestion is made for every element of the current path, though
  // numeric elements are not carried to subsequent suggestions. For example,
  // http://www.example.com/node/1/edit would result in the following
  // suggestions:
  //
  // page-node-edit.tpl.php
  // page-node-1.tpl.php
  // page-node.tpl.php
  // page.tpl.php
  $i = 0;
  $suggestion = 'page';
  $suggestions = array();
  while ($arg = arg($i++)) {
    $suggestions[] = $suggestion . '-' . $arg;
    if (!is_numeric($arg)) {
      $suggestion .= '-' . $arg;
    }
  }
  if (drupal_is_front_page()) {
    $suggestions[] = 'page-front';
  }

  if ($suggestions) {
    $variables['template_files'] = $suggestions;
  }
}

function template_preprocess_node(&$variables) {
  $node = $variables['node'];
  if (module_exists('taxonomy')) {
    $variables['taxonomy'] = taxonomy_link('taxonomy terms', $node);
  }
  else {
    $variables['taxonomy'] = array();
  }

  if ($variables['teaser'] && $node->teaser) {
    $variables['content'] = $node->teaser;
  }
  elseif (isset($node->body)) {
    $variables['content'] = $node->body;
  }
  else {
    $variables['content'] = '';
  }

  $variables['date']      = format_date($node->created);
  $variables['links']     = !empty($node->links) ? theme('links', $node->links, array('class' => 'links inline')) : '';
  $variables['name']      = theme('username', $node);
  $variables['node_url']  = url('node/' . $node->nid);
  $variables['terms']     = theme('links', $variables['taxonomy'], array('class' => 'links inline'));
  $variables['title']     = check_plain($node->title);

  // Flatten the node object's member fields.
  $variables = array_merge((array)$node, $variables);

  // Display info only on certain node types.
  if (theme_get_setting('toggle_node_info_' . $node->type)) {
    $variables['submitted'] = theme('node_submitted', $node);
    $variables['picture'] = theme_get_setting('toggle_node_user_picture') ? theme('user_picture', $node) : '';
  }
  else {
    $variables['submitted'] = '';
    $variables['picture'] = '';
  }
  // Clean up name so there are no underscores.
  $variables['template_files'][] = 'node-' . $node->type;
}

function template_preprocess_block(&$variables) {
  static $block_counter = array();
  // All blocks get an independent counter for each region.
  if (!isset($block_counter[$variables['block']->region])) {
    $block_counter[$variables['block']->region] = 1;
  }
  // Same with zebra striping.
  $variables['block_zebra'] = ($block_counter[$variables['block']->region] % 2) ? 'odd' : 'even';
  $variables['block_id'] = $block_counter[$variables['block']->region]++;

  $variables['template_files'][] = 'block-' . $variables['block']->region;
  $variables['template_files'][] = 'block-' . $variables['block']->module;
  $variables['template_files'][] = 'block-' . $variables['block']->module . '-' . $variables['block']->delta;
}

---