corpus_parole: comparison cms/drupal/includes/theme.inc

equal deleted inserted replaced

-:07239de796bb
+:e756a8c72c3d
+<?php
+/**
+* @file
+* The theme system, which controls the output of Drupal.
+*
+* The theme system allows for nearly all output of the Drupal system to be
+* customized by user themes.
+*/
+/**
+* @defgroup content_flags Content markers
+* @{
+* Markers used by theme_mark() and node_mark() to designate content.
+* @see theme_mark(), node_mark()
+*/
+/**
+* Mark content as read.
+*/
+define('MARK_READ', 0);
+/**
+* Mark content as being new.
+*/
+define('MARK_NEW', 1);
+/**
+* Mark content as being updated.
+*/
+define('MARK_UPDATED', 2);
+/**
+* @} End of "Content markers".
+*/
+/**
+* Determines if a theme is available to use.
+*
+* @param $theme
+*   Either the name of a theme or a full theme object.
+*
+* @return
+*   Boolean TRUE if the theme is enabled or is the site administration theme;
+*   FALSE otherwise.
+*/
+function drupal_theme_access($theme) {
+if (is_object($theme)) {
+return _drupal_theme_access($theme);
+}
+else {
+$themes = list_themes();
+return isset($themes[$theme]) && _drupal_theme_access($themes[$theme]);
+}
+}
+/**
+* Helper function for determining access to a theme.
+*
+* @see drupal_theme_access()
+*/
+function _drupal_theme_access($theme) {
+$admin_theme = variable_get('admin_theme');
+return !empty($theme->status) || ($admin_theme && $theme->name == $admin_theme);
+}
+/**
+* Initializes the theme system by loading the theme.
+*/
+function drupal_theme_initialize() {
+global $theme, $user, $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);
+$themes = list_themes();
+// Only select the user selected theme if it is available in the
+// list of themes that can be accessed.
+$theme = !empty($user->theme) && drupal_theme_access($user->theme) ? $user->theme : variable_get('theme_default', 'bartik');
+// Allow modules to override the theme. Validation has already been performed
+// inside menu_get_custom_theme(), so we do not need to check it again here.
+$custom_theme = menu_get_custom_theme();
+$theme = !empty($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)) {
+$ancestor = $themes[$ancestor]->base_theme;
+$base_theme[] = $themes[$ancestor];
+}
+_drupal_theme_initialize($themes[$theme], array_reverse($base_theme));
+// Themes can have alter functions, so reset the drupal_alter() cache.
+drupal_static_reset('drupal_alter');
+// Provide the page with information about the theme that's used, so that a
+// later Ajax request can be rendered using the same theme.
+// @see ajax_base_page_theme()
+$setting['ajaxPageState'] = array(
+'theme' => $theme_key,
+'theme_token' => drupal_get_token($theme_key),
+);
+drupal_add_js($setting, 'setting');
+}
+/**
+* Initializes the theme system given already loaded information.
+*
+* This function is useful to initialize a theme when no database is present.
+*
+* @param $theme
+*   An object with the following information:
+*     filename
+*       The .info file for this theme. The 'path' to
+*       the theme will be in this file's directory. (Required)
+*     owner
+*       The path to the .theme file or the .engine file to load for
+*       the theme. (Required)
+*     stylesheet
+*       The primary stylesheet for the theme. (Optional)
+*     engine
+*       The name of theme engine to use. (Optional)
+* @param $base_theme
+*    An optional array of objects that represent the 'base theme' if the
+*    theme is meant to be derivative of another theme. It requires
+*    the same information as the $theme object. It should be in
+*    'oldest first' order, meaning the top level of the chain will
+*    be first.
+* @param $registry_callback
+*   The callback to invoke to set the theme registry.
+*/
+function _drupal_theme_initialize($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, array('group' => CSS_THEME, 'every_page' => TRUE, 'media' => $media));
+}
+}
+// Do basically the same as the above for scripts
+$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, array('group' => JS_THEME, 'every_page' => TRUE));
+}
+$theme_engine = NULL;
+// Initialize the theme.
+if (isset($theme->engine)) {
+// Include the engine.
+include_once DRUPAL_ROOT . '/' . $theme->owner;
+$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 DRUPAL_ROOT . '/' . $base->owner;
+}
+}
+// and our theme gets one too.
+if (!empty($theme->owner)) {
+include_once DRUPAL_ROOT . '/' . $theme->owner;
+}
+}
+if (isset($registry_callback)) {
+_theme_registry_callback($registry_callback, array($theme, $base_theme, $theme_engine));
+}
+}
+/**
+* Gets the theme registry.
+*
+* @param $complete
+*   Optional boolean to indicate whether to return the complete theme registry
+*   array or an instance of the ThemeRegistry class. If TRUE, the complete
+*   theme registry array will be returned. This is useful if you want to
+*   foreach over the whole registry, use array_* functions or inspect it in a
+*   debugger. If FALSE, an instance of the ThemeRegistry class will be
+*   returned, this provides an ArrayObject which allows it to be accessed
+*   with array syntax and  isset(), and should be more lightweight
+*   than the full registry. Defaults to TRUE.
+*
+* @return
+*   The complete theme registry array, or an instance of the ThemeRegistry
+*   class.
+*/
+function theme_get_registry($complete = TRUE) {
+// Use the advanced drupal_static() pattern, since this is called very often.
+static $drupal_static_fast;
+if (!isset($drupal_static_fast)) {
+$drupal_static_fast['registry'] = &drupal_static('theme_get_registry');
+}
+$theme_registry = &$drupal_static_fast['registry'];
+// Initialize the theme, if this is called early in the bootstrap, or after
+// static variables have been reset.
+if (!is_array($theme_registry)) {
+drupal_theme_initialize();
+$theme_registry = array();
+}
+$key = (int) $complete;
+if (!isset($theme_registry[$key])) {
+list($callback, $arguments) = _theme_registry_callback();
+if (!$complete) {
+$arguments[] = FALSE;
+}
+$theme_registry[$key] = call_user_func_array($callback, $arguments);
+}
+return $theme_registry[$key];
+}
+/**
+* Sets the callback that will be used by theme_get_registry().
+*
+* @param $callback
+*   The name of the callback function.
+* @param $arguments
+*   The arguments to pass to the function.
+*/
+function _theme_registry_callback($callback = NULL, array $arguments = array()) {
+static $stored;
+if (isset($callback)) {
+$stored = array($callback, $arguments);
+}
+return $stored;
+}
+/**
+* Gets the theme_registry cache; if it doesn't exist, builds it.
+*
+* @param $theme
+*   The loaded $theme object as returned by list_themes().
+* @param $base_theme
+*   An array of loaded $theme objects representing the ancestor themes in
+*   oldest first order.
+* @param $theme_engine
+*   The name of the theme engine.
+* @param $complete
+*   Whether to load the complete theme registry or an instance of the
+*   ThemeRegistry class.
+*
+* @return
+*   The theme registry array, or an instance of the ThemeRegistry class.
+*/
+function _theme_load_registry($theme, $base_theme = NULL, $theme_engine = NULL, $complete = TRUE) {
+if ($complete) {
+// Check the theme registry cache; if it exists, use it.
+$cached = cache_get("theme_registry:$theme->name");
+if (isset($cached->data)) {
+$registry = $cached->data;
+}
+else {
+// If not, build one and cache it.
+$registry = _theme_build_registry($theme, $base_theme, $theme_engine);
+// Only persist this registry if all modules are loaded. This assures a
+// complete set of theme hooks.
+if (module_load_all(NULL)) {
+_theme_save_registry($theme, $registry);
+}
+}
+return $registry;
+}
+else {
+return new ThemeRegistry('theme_registry:runtime:' . $theme->name, 'cache');
+}
+}
+/**
+* Writes the theme_registry cache into the database.
+*/
+function _theme_save_registry($theme, $registry) {
+cache_set("theme_registry:$theme->name", $registry);
+}
+/**
+* Forces the system to rebuild the theme registry.
+*
+* This function should be called when modules are added to the system, or when
+* a dynamic system needs to add more theme hooks.
+*/
+function drupal_theme_rebuild() {
+drupal_static_reset('theme_get_registry');
+cache_clear_all('theme_registry', 'cache', TRUE);
+}
+/**
+* Builds the run-time theme registry.
+*
+* Extends DrupalCacheArray to allow the theme registry to be accessed as a
+* complete registry, while internally caching only the parts of the registry
+* that are actually in use on the site. On cache misses the complete
+* theme registry is loaded and used to update the run-time cache.
+*/
+class ThemeRegistry Extends DrupalCacheArray {
+/**
+* Whether the partial registry can be persisted to the cache.
+*
+* This is only allowed if all modules and the request method is GET. theme()
+* should be very rarely called on POST requests and this avoids polluting
+* the runtime cache.
+*/
+protected $persistable;
+/**
+* The complete theme registry array.
+*/
+protected $completeRegistry;
+function __construct($cid, $bin) {
+$this->cid = $cid;
+$this->bin = $bin;
+$this->persistable = module_load_all(NULL) && $_SERVER['REQUEST_METHOD'] == 'GET';
+$data = array();
+if ($this->persistable && $cached = cache_get($this->cid, $this->bin)) {
+$data = $cached->data;
+}
+else {
+// If there is no runtime cache stored, fetch the full theme registry,
+// but then initialize each value to NULL. This allows offsetExists()
+// to function correctly on non-registered theme hooks without triggering
+// a call to resolveCacheMiss().
+$data = $this->initializeRegistry();
+if ($this->persistable) {
+$this->set($data);
+}
+}
+$this->storage = $data;
+}
+/**
+* Initializes the full theme registry.
+*
+* @return
+*   An array with the keys of the full theme registry, but the values
+*   initialized to NULL.
+*/
+function initializeRegistry() {
+$this->completeRegistry = theme_get_registry();
+return array_fill_keys(array_keys($this->completeRegistry), NULL);
+}
+public function offsetExists($offset) {
+// Since the theme registry allows for theme hooks to be requested that
+// are not registered, just check the existence of the key in the registry.
+// Use array_key_exists() here since a NULL value indicates that the theme
+// hook exists but has not yet been requested.
+return array_key_exists($offset, $this->storage);
+}
+public function offsetGet($offset) {
+// If the offset is set but empty, it is a registered theme hook that has
+// not yet been requested. Offsets that do not exist at all were not
+// registered in hook_theme().
+if (isset($this->storage[$offset])) {
+return $this->storage[$offset];
+}
+elseif (array_key_exists($offset, $this->storage)) {
+return $this->resolveCacheMiss($offset);
+}
+}
+public function resolveCacheMiss($offset) {
+if (!isset($this->completeRegistry)) {
+$this->completeRegistry = theme_get_registry();
+}
+$this->storage[$offset] = $this->completeRegistry[$offset];
+if ($this->persistable) {
+$this->persist($offset);
+}
+return $this->storage[$offset];
+}
+public function set($data, $lock = TRUE) {
+$lock_name = $this->cid . ':' . $this->bin;
+if (!$lock || lock_acquire($lock_name)) {
+if ($cached = cache_get($this->cid, $this->bin)) {
+// Use array merge instead of union so that filled in values in $data
+// overwrite empty values in the current cache.
+$data = array_merge($cached->data, $data);
+}
+else {
+$registry = $this->initializeRegistry();
+$data = array_merge($registry, $data);
+}
+cache_set($this->cid, $data, $this->bin);
+if ($lock) {
+lock_release($lock_name);
+}
+}
+}
+}
+/**
+* Process a single implementation of hook_theme().
+*
+* @param $cache
+*   The theme registry that will eventually be cached; It is an associative
+*   array keyed by theme hooks, whose values are associative arrays describing
+*   the hook:
+*   - 'type': The passed-in $type.
+*   - 'theme path': The passed-in $path.
+*   - 'function': The name of the function generating output for this theme
+*     hook. Either defined explicitly in hook_theme() or, if neither 'function'
+*     nor 'template' is defined, then the default theme function name is used.
+*     The default theme function name is the theme hook prefixed by either
+*     'theme_' for modules or '$name_' for everything else. If 'function' is
+*     defined, 'template' is not used.
+*   - 'template': The filename of the template generating output for this
+*     theme hook. The template is in the directory defined by the 'path' key of
+*     hook_theme() or defaults to $path.
+*   - 'variables': The variables for this theme hook as defined in
+*     hook_theme(). If there is more than one implementation and 'variables' is
+*     not specified in a later one, then the previous definition is kept.
+*   - 'render element': The renderable element for this theme hook as defined
+*     in hook_theme(). If there is more than one implementation and
+*     'render element' is not specified in a later one, then the previous
+*     definition is kept.
+*   - 'preprocess functions': See theme() for detailed documentation.
+*   - 'process functions': See theme() for detailed documentation.
+* @param $name
+*   The name of the module, theme engine, base theme engine, theme or base
+*   theme implementing hook_theme().
+* @param $type
+*   One of 'module', 'theme_engine', 'base_theme_engine', 'theme', or
+*   'base_theme'. Unlike regular hooks that can only be implemented by modules,
+*   each of these can implement hook_theme(). _theme_process_registry() is
+*   called in aforementioned order and new entries override older ones. For
+*   example, if a theme hook is both defined by a module and a theme, then the
+*   definition in the theme will be used.
+* @param $theme
+*   The loaded $theme object as returned from list_themes().
+* @param $path
+*   The directory where $name is. For example, modules/system or
+*   themes/bartik.
+*
+* @see theme()
+* @see _theme_build_registry()
+* @see hook_theme()
+* @see list_themes()
+*/
+function _theme_process_registry(&$cache, $name, $type, $theme, $path) {
+$result = array();
+// Processor functions work in two distinct phases with the process
+// functions always being executed after the preprocess functions.
+$variable_process_phases = array(
+'preprocess functions' => 'preprocess',
+'process functions'    => 'process',
+);
+$hook_defaults = array(
+'variables' => TRUE,
+'render element' => TRUE,
+'pattern' => TRUE,
+'base hook' => TRUE,
+);
+// Invoke the hook_theme() implementation, process what is returned, and
+// merge it into $cache.
+$function = $name . '_theme';
+if (function_exists($function)) {
+$result = $function($cache, $type, $theme, $path);
+foreach ($result as $hook => $info) {
+// When a theme or engine overrides a module's theme function
+// $result[$hook] will only contain key/value pairs for information being
+// overridden.  Pull the rest of the information from what was defined by
+// an earlier hook.
+// Fill in the type and path of the module, theme, or engine that
+// implements this theme function.
+$result[$hook]['type'] = $type;
+$result[$hook]['theme path'] = $path;
+// If function and file are omitted, default to standard naming
+// conventions.
+if (!isset($info['template']) && !isset($info['function'])) {
+$result[$hook]['function'] = ($type == 'module' ? 'theme_' : $name . '_') . $hook;
+}
+if (isset($cache[$hook]['includes'])) {
+$result[$hook]['includes'] = $cache[$hook]['includes'];
+}
+// If the theme implementation defines a file, then also use the path
+// that it defined. Otherwise use the default path. This allows
+// system.module to declare theme functions on behalf of core .include
+// files.
+if (isset($info['file'])) {
+$include_file = isset($info['path']) ? $info['path'] : $path;
+$include_file .= '/' . $info['file'];
+include_once DRUPAL_ROOT . '/' . $include_file;
+$result[$hook]['includes'][] = $include_file;
+}
+// If the default keys are not set, use the default values registered
+// by the module.
+if (isset($cache[$hook])) {
+$result[$hook] += array_intersect_key($cache[$hook], $hook_defaults);
+}
+// The following apply only to theming hooks implemented as templates.
+if (isset($info['template'])) {
+// Prepend the current theming path when none is set.
+if (!isset($info['path'])) {
+$result[$hook]['template'] = $path . '/' . $info['template'];
+}
+}
+// Allow variable processors for all theming hooks, whether the hook is
+// implemented as a template or as a function.
+foreach ($variable_process_phases as $phase_key => $phase) {
+// Check for existing variable processors. Ensure arrayness.
+if (!isset($info[$phase_key]) || !is_array($info[$phase_key])) {
+$info[$phase_key] = array();
+$prefixes = array();
+if ($type == 'module') {
+// Default variable processor prefix.
+$prefixes[] = 'template';
+// Add all modules so they can intervene with their own variable
+// processors. This allows them to provide variable processors even
+// if they are not the owner of the current hook.
+$prefixes += module_list();
+}
+elseif ($type == 'theme_engine' || $type == 'base_theme_engine') {
+// Theme engines get an extra set that come before the normally
+// named variable processors.
+$prefixes[] = $name . '_engine';
+// The theme engine registers on behalf of the theme using the
+// theme's name.
+$prefixes[] = $theme;
+}
+else {
+// This applies when the theme manually registers their own variable
+// processors.
+$prefixes[] = $name;
+}
+foreach ($prefixes as $prefix) {
+// Only use non-hook-specific variable processors for theming hooks
+// implemented as templates. See theme().
+if (isset($info['template']) && function_exists($prefix . '_' . $phase)) {
+$info[$phase_key][] = $prefix . '_' . $phase;
+}
+if (function_exists($prefix . '_' . $phase . '_' . $hook)) {
+$info[$phase_key][] = $prefix . '_' . $phase . '_' . $hook;
+}
+}
+}
+// Check for the override flag and prevent the cached variable
+// processors from being used. This allows themes or theme engines to
+// remove variable processors set earlier in the registry build.
+if (!empty($info['override ' . $phase_key])) {
+// Flag not needed inside the registry.
+unset($result[$hook]['override ' . $phase_key]);
+}
+elseif (isset($cache[$hook][$phase_key]) && is_array($cache[$hook][$phase_key])) {
+$info[$phase_key] = array_merge($cache[$hook][$phase_key], $info[$phase_key]);
+}
+$result[$hook][$phase_key] = $info[$phase_key];
+}
+}
+// Merge the newly created theme hooks into the existing cache.
+$cache = $result + $cache;
+}
+// Let themes have variable processors even if they didn't register a
+// template.
+if ($type == 'theme' || $type == 'base_theme') {
+foreach ($cache as $hook => $info) {
+// Check only if not registered by the theme or engine.
+if (empty($result[$hook])) {
+foreach ($variable_process_phases as $phase_key => $phase) {
+if (!isset($info[$phase_key])) {
+$cache[$hook][$phase_key] = array();
+}
+// Only use non-hook-specific variable processors for theming hooks
+// implemented as templates. See theme().
+if (isset($info['template']) && function_exists($name . '_' . $phase)) {
+$cache[$hook][$phase_key][] = $name . '_' . $phase;
+}
+if (function_exists($name . '_' . $phase . '_' . $hook)) {
+$cache[$hook][$phase_key][] = $name . '_' . $phase . '_' . $hook;
+$cache[$hook]['theme path'] = $path;
+}
+// Ensure uniqueness.
+$cache[$hook][$phase_key] = array_unique($cache[$hook][$phase_key]);
+}
+}
+}
+}
+}
+/**
+* Builds the theme registry cache.
+*
+* @param $theme
+*   The loaded $theme object as returned by list_themes().
+* @param $base_theme
+*   An array of loaded $theme objects representing the ancestor themes in
+*   oldest first order.
+* @param $theme_engine
+*   The name of the theme engine.
+*/
+function _theme_build_registry($theme, $base_theme, $theme_engine) {
+$cache = array();
+// First, process the theme hooks advertised by modules. This will
+// serve as the basic registry. Since the list of enabled modules is the same
+// regardless of the theme used, this is cached in its own entry to save
+// building it for every theme.
+if ($cached = cache_get('theme_registry:build:modules')) {
+$cache = $cached->data;
+}
+else {
+foreach (module_implements('theme') as $module) {
+_theme_process_registry($cache, $module, 'module', $module, drupal_get_path('module', $module));
+}
+// Only cache this registry if all modules are loaded.
+if (module_load_all(NULL)) {
+cache_set('theme_registry:build:modules', $cache);
+}
+}
+// Process each base theme.
+foreach ($base_theme as $base) {
+// If the base theme uses a theme engine, process its hooks.
+$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', $cache);
+// Optimize the registry to not have empty arrays for functions.
+foreach ($cache as $hook => $info) {
+foreach (array('preprocess functions', 'process functions') as $phase) {
+if (empty($info[$phase])) {
+unset($cache[$hook][$phase]);
+}
+}
+}
+return $cache;
+}
+/**
+* Returns a list of all currently available themes.
+*
+* Retrieved from the database, if available and the site is not in maintenance
+* mode; otherwise compiled freshly from the filesystem.
+*
+* @param $refresh
+*   Whether to reload the list of themes from the database. Defaults to FALSE.
+*
+* @return
+*   An associative array of the currently available themes. The keys are the
+*   themes' machine names and the values are objects having the following
+*   properties:
+*   - filename: The filepath and name of the .info file.
+*   - name: The machine name of the theme.
+*   - status: 1 for enabled, 0 for disabled themes.
+*   - info: The contents of the .info file.
+*   - stylesheets: A two dimensional array, using the first key for the
+*     media attribute (e.g. 'all'), the second for the name of the file
+*     (e.g. style.css). The value is a complete filepath (e.g.
+*     themes/bartik/style.css). Not set if no stylesheets are defined in the
+*     .info file.
+*   - scripts: An associative array of JavaScripts, using the filename as key
+*     and the complete filepath as value. Not set if no scripts are defined in
+*     the .info file.
+*   - prefix: The base theme engine prefix.
+*   - engine: The machine name of the theme engine.
+*   - base_theme: If this is a sub-theme, the machine name of the base theme
+*     defined in the .info file. Otherwise, the element is not set.
+*   - base_themes: If this is a sub-theme, an associative array of the
+*     base-theme ancestors of this theme, starting with this theme's base
+*     theme, then the base theme's own base theme, etc. Each entry has an
+*     array key equal to the theme's machine name, and a value equal to the
+*     human-readable theme name; if a theme with matching machine name does
+*     not exist in the system, the value will instead be NULL (and since the
+*     system would not know whether that theme itself has a base theme, that
+*     will end the array of base themes). This is not set if the theme is not
+*     a sub-theme.
+*   - sub_themes: An associative array of themes on the system that are
+*     either direct sub-themes (that is, they declare this theme to be
+*     their base theme), direct sub-themes of sub-themes, etc. The keys are
+*     the themes' machine names, and the values are the themes' human-readable
+*     names. This element is not set if there are no themes on the system that
+*     declare this theme as their base theme.
+*/
+function list_themes($refresh = FALSE) {
+$list = &drupal_static(__FUNCTION__, array());
+if ($refresh) {
+$list = array();
+system_list_reset();
+}
+if (empty($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 (!defined('MAINTENANCE_MODE')) {
+try {
+$themes = system_list('theme');
+}
+catch (Exception $e) {
+// If the database is not available, rebuild the theme data.
+$themes = _system_rebuild_theme_data();
+}
+}
+else {
+// Scan the installation when the database should not be read.
+$themes = _system_rebuild_theme_data();
+}
+foreach ($themes as $theme) {
+foreach ($theme->info['stylesheets'] as $media => $stylesheets) {
+foreach ($stylesheets as $stylesheet => $path) {
+$theme->stylesheets[$media][$stylesheet] = $path;
+}
+}
+foreach ($theme->info['scripts'] as $script => $path) {
+$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;
+}
+/**
+* Find all the base themes for the specified theme.
+*
+* Themes can inherit templates and function implementations from earlier themes.
+*
+* @param $themes
+*   An array of available themes.
+* @param $key
+*   The name of the theme whose base we are looking for.
+* @param $used_keys
+*   A recursion parameter preventing endless loops.
+* @return
+*   Returns an array of all of the theme's ancestors; the first element's value
+*   will be NULL if an error occurred.
+*/
+function drupal_find_base_themes($themes, $key, $used_keys = array()) {
+$base_key = $themes[$key]->info['base theme'];
+// Does the base theme exist?
+if (!isset($themes[$base_key])) {
+return array($base_key => NULL);
+}
+$current_base_theme = array($base_key => $themes[$base_key]->info['name']);
+// Is the base theme itself a child of another theme?
+if (isset($themes[$base_key]->info['base theme'])) {
+// Do we already know the base themes of this theme?
+if (isset($themes[$base_key]->base_themes)) {
+return $themes[$base_key]->base_themes + $current_base_theme;
+}
+// Prevent loops.
+if (!empty($used_keys[$base_key])) {
+return array($base_key => NULL);
+}
+$used_keys[$base_key] = TRUE;
+return drupal_find_base_themes($themes, $base_key, $used_keys) + $current_base_theme;
+}
+// If we get here, then this is our parent theme.
+return $current_base_theme;
+}
+/**
+* Generates themed output.
+*
+* All requests for themed output must go through this function (however,
+* calling the theme() function directly is strongly discouraged - see next
+* paragraph). It examines the request and routes it to the appropriate
+* @link themeable theme function or template @endlink, by checking the theme
+* registry.
+*
+* Avoid calling this function directly. It is preferable to replace direct
+* calls to the theme() function with calls to drupal_render() by passing a
+* render array with a #theme key to drupal_render(), which in turn calls
+* theme().
+*
+* @section sec_theme_hooks Theme Hooks
+* Most commonly, the first argument to this function is the name of the theme
+* hook. For instance, to theme a taxonomy term, the theme hook name is
+* 'taxonomy_term'. Modules register theme hooks within a hook_theme()
+* implementation and provide a default implementation via a function named
+* theme_HOOK() (e.g., theme_taxonomy_term()) or via a template file named
+* according to the value of the 'template' key registered with the theme hook
+* (see hook_theme() for details). Default templates are implemented with the
+* PHPTemplate rendering engine and are named the same as the theme hook, with
+* underscores changed to hyphens, so for the 'taxonomy_term' theme hook, the
+* default template is 'taxonomy-term.tpl.php'.
+*
+* @subsection sub_overriding_theme_hooks Overriding Theme Hooks
+* Themes may also register new theme hooks within a hook_theme()
+* implementation, but it is more common for themes to override default
+* implementations provided by modules than to register entirely new theme
+* hooks. Themes can override a default implementation by implementing a
+* function named THEME_HOOK() (for example, the 'bartik' theme overrides the
+* default implementation of the 'menu_tree' theme hook by implementing a
+* bartik_menu_tree() function), or by adding a template file within its folder
+* structure that follows the template naming structure used by the theme's
+* rendering engine (for example, since the Bartik theme uses the PHPTemplate
+* rendering engine, it overrides the default implementation of the 'page' theme
+* hook by containing a 'page.tpl.php' file within its folder structure).
+*
+* @subsection sub_preprocess_templates Preprocessing for Template Files
+* If the implementation is a template file, several functions are called
+* before the template file is invoked, to modify the $variables array. These
+* fall into the "preprocessing" phase and the "processing" phase, and are
+* executed (if they exist), in the following order (note that in the following
+* list, HOOK indicates the theme hook name, MODULE indicates a module name,
+* THEME indicates a theme name, and ENGINE indicates a theme engine name):
+* - template_preprocess(&$variables, $hook): Creates a default set of
+*   variables for all theme hooks with template implementations.
+* - template_preprocess_HOOK(&$variables): Should be implemented by the module
+*   that registers the theme hook, to set up default variables.
+* - MODULE_preprocess(&$variables, $hook): hook_preprocess() is invoked on all
+*   implementing modules.
+* - MODULE_preprocess_HOOK(&$variables): hook_preprocess_HOOK() is invoked on
+*   all implementing modules, so that modules that didn't define the theme
+*   hook can alter the variables.
+* - ENGINE_engine_preprocess(&$variables, $hook): Allows the theme engine to
+*   set necessary variables for all theme hooks with template implementations.
+* - ENGINE_engine_preprocess_HOOK(&$variables): Allows the theme engine to set
+*   necessary variables for the particular theme hook.
+* - THEME_preprocess(&$variables, $hook): Allows the theme to set necessary
+*   variables for all theme hooks with template implementations.
+* - THEME_preprocess_HOOK(&$variables): Allows the theme to set necessary
+*   variables specific to the particular theme hook.
+* - template_process(&$variables, $hook): Creates an additional set of default
+*   variables for all theme hooks with template implementations. The variables
+*   created in this function are derived from ones created by
+*   template_preprocess(), but potentially altered by the other preprocess
+*   functions listed above. For example, any preprocess function can add to or
+*   modify the $variables['attributes_array'] variable, and after all of them
+*   have finished executing, template_process() flattens it into a
+*   $variables['attributes'] string for convenient use by templates.
+* - template_process_HOOK(&$variables): Should be implemented by the module
+*   that registers the theme hook, if it needs to perform additional variable
+*   processing after all preprocess functions have finished.
+* - MODULE_process(&$variables, $hook): hook_process() is invoked on all
+*   implementing modules.
+* - MODULE_process_HOOK(&$variables): hook_process_HOOK() is invoked on
+*   on all implementing modules, so that modules that didn't define the theme
+*   hook can alter the variables.
+* - ENGINE_engine_process(&$variables, $hook): Allows the theme engine to
+*   process variables for all theme hooks with template implementations.
+* - ENGINE_engine_process_HOOK(&$variables): Allows the theme engine to process
+*   the variables specific to the theme hook.
+* - THEME_process(&$variables, $hook):  Allows the theme to process the
+*   variables for all theme hooks with template implementations.
+* - THEME_process_HOOK(&$variables):  Allows the theme to process the
+*   variables specific to the theme hook.
+*
+* @subsection sub_preprocess_theme_funcs Preprocessing for Theme Functions
+* If the implementation is a function, only the theme-hook-specific preprocess
+* and process functions (the ones ending in _HOOK) are called from the
+* list above. This is because theme hooks with function implementations
+* need to be fast, and calling the non-theme-hook-specific preprocess and
+* process functions for them would incur a noticeable performance penalty.
+*
+* @subsection sub_alternate_suggestions Suggesting Alternate Hooks
+* There are two special variables that these preprocess and process functions
+* can set: 'theme_hook_suggestion' and 'theme_hook_suggestions'. These will be
+* merged together to form a list of 'suggested' alternate theme hooks to use,
+* in reverse order of priority. theme_hook_suggestion will always be a higher
+* priority than items in theme_hook_suggestions. theme() will use the
+* highest priority implementation that exists. If none exists, theme() will
+* use the implementation for the theme hook it was called with. These
+* suggestions are similar to and are used for similar reasons as calling
+* theme() with an array as the $hook parameter (see below). The difference
+* is whether the suggestions are determined by the code that calls theme() or
+* by a preprocess or process function.
+*
+* @param $hook
+*   The name of the theme hook to call. If the name contains a
+*   double-underscore ('__') and there isn't an implementation for the full
+*   name, the part before the '__' is checked. This allows a fallback to a
+*   more generic implementation. For example, if theme('links__node', ...) is
+*   called, but there is no implementation of that theme hook, then the
+*   'links' implementation is used. This process is iterative, so if
+*   theme('links__contextual__node', ...) is called, theme() checks for the
+*   following implementations, and uses the first one that exists:
+*   - links__contextual__node
+*   - links__contextual
+*   - links
+*   This allows themes to create specific theme implementations for named
+*   objects and contexts of otherwise generic theme hooks. The $hook parameter
+*   may also be an array, in which case the first theme hook that has an
+*   implementation is used. This allows for the code that calls theme() to
+*   explicitly specify the fallback order in a situation where using the '__'
+*   convention is not desired or is insufficient.
+* @param $variables
+*   An associative array of variables to merge with defaults from the theme
+*   registry, pass to preprocess and process functions for modification, and
+*   finally, pass to the function or template implementing the theme hook.
+*   Alternatively, this can be a renderable array, in which case, its
+*   properties are mapped to variables expected by the theme hook
+*   implementations.
+*
+* @return
+*   An HTML string representing the themed output.
+*
+* @see drupal_render()
+* @see themeable
+* @see hook_theme()
+* @see template_preprocess()
+* @see template_process()
+*/
+function theme($hook, $variables = array()) {
+// If called before all modules are loaded, we do not necessarily have a full
+// theme registry to work with, and therefore cannot process the theme
+// request properly. See also _theme_load_registry().
+if (!module_load_all(NULL) && !defined('MAINTENANCE_MODE')) {
+throw new Exception(t('theme() may not be called until all modules are loaded.'));
+}
+$hooks = theme_get_registry(FALSE);
+// If an array of hook candidates were passed, use the first one that has an
+// implementation.
+if (is_array($hook)) {
+foreach ($hook as $candidate) {
+if (isset($hooks[$candidate])) {
+break;
+}
+}
+$hook = $candidate;
+}
+$theme_hook_original = $hook;
+// If there's no implementation, check for more generic fallbacks. If there's
+// still no implementation, log an error and return an empty string.
+if (!isset($hooks[$hook])) {
+// Iteratively strip everything after the last '__' delimiter, until an
+// implementation is found.
+while ($pos = strrpos($hook, '__')) {
+$hook = substr($hook, 0, $pos);
+if (isset($hooks[$hook])) {
+break;
+}
+}
+if (!isset($hooks[$hook])) {
+// Only log a message when not trying theme suggestions ($hook being an
+// array).
+if (!isset($candidate)) {
+watchdog('theme', 'Theme hook %hook not found.', array('%hook' => $hook), WATCHDOG_WARNING);
+}
+return '';
+}
+}
+$info = $hooks[$hook];
+global $theme_path;
+$temp = $theme_path;
+// point path_to_theme() to the currently used theme path:
+$theme_path = $info['theme path'];
+// Include a file if the theme function or variable processor is held
+// elsewhere.
+if (!empty($info['includes'])) {
+foreach ($info['includes'] as $include_file) {
+include_once DRUPAL_ROOT . '/' . $include_file;
+}
+}
+// If a renderable array is passed as $variables, then set $variables to
+// the arguments expected by the theme function.
+if (isset($variables['#theme']) || isset($variables['#theme_wrappers'])) {
+$element = $variables;
+$variables = array();
+if (isset($info['variables'])) {
+foreach (array_keys($info['variables']) as $name) {
+if (isset($element["#$name"])) {
+$variables[$name] = $element["#$name"];
+}
+}
+}
+else {
+$variables[$info['render element']] = $element;
+}
+}
+// Merge in argument defaults.
+if (!empty($info['variables'])) {
+$variables += $info['variables'];
+}
+elseif (!empty($info['render element'])) {
+$variables += array($info['render element'] => array());
+}
+$variables['theme_hook_original'] = $theme_hook_original;
+// Invoke the variable processors, if any. The processors may specify
+// alternate suggestions for which hook's template/function to use. If the
+// hook is a suggestion of a base hook, invoke the variable processors of
+// the base hook, but retain the suggestion as a high priority suggestion to
+// be used unless overridden by a variable processor function.
+if (isset($info['base hook'])) {
+$base_hook = $info['base hook'];
+$base_hook_info = $hooks[$base_hook];
+// Include files required by the base hook, since its variable processors
+// might reside there.
+if (!empty($base_hook_info['includes'])) {
+foreach ($base_hook_info['includes'] as $include_file) {
+include_once DRUPAL_ROOT . '/' . $include_file;
+}
+}
+if (isset($base_hook_info['preprocess functions']) || isset($base_hook_info['process functions'])) {
+$variables['theme_hook_suggestion'] = $hook;
+$hook = $base_hook;
+$info = $base_hook_info;
+}
+}
+if (isset($info['preprocess functions']) || isset($info['process functions'])) {
+$variables['theme_hook_suggestions'] = array();
+foreach (array('preprocess functions', 'process functions') as $phase) {
+if (!empty($info[$phase])) {
+foreach ($info[$phase] as $processor_function) {
+if (function_exists($processor_function)) {
+// We don't want a poorly behaved process function changing $hook.
+$hook_clone = $hook;
+$processor_function($variables, $hook_clone);
+}
+}
+}
+}
+// If the preprocess/process functions specified hook suggestions, and the
+// suggestion exists in the theme registry, use it instead of the hook that
+// theme() was called with. This allows the preprocess/process step to
+// route to a more specific theme hook. For example, a function may call
+// theme('node', ...), but a preprocess function can add 'node__article' as
+// a suggestion, enabling a theme to have an alternate template file for
+// article nodes. Suggestions are checked in the following order:
+// - The 'theme_hook_suggestion' variable is checked first. It overrides
+//   all others.
+// - The 'theme_hook_suggestions' variable is checked in FILO order, so the
+//   last suggestion added to the array takes precedence over suggestions
+//   added earlier.
+$suggestions = array();
+if (!empty($variables['theme_hook_suggestions'])) {
+$suggestions = $variables['theme_hook_suggestions'];
+}
+if (!empty($variables['theme_hook_suggestion'])) {
+$suggestions[] = $variables['theme_hook_suggestion'];
+}
+foreach (array_reverse($suggestions) as $suggestion) {
+if (isset($hooks[$suggestion])) {
+$info = $hooks[$suggestion];
+break;
+}
+}
+}
+// Generate the output using either a function or a template.
+$output = '';
+if (isset($info['function'])) {
+if (function_exists($info['function'])) {
+$output = $info['function']($variables);
+}
+}
+else {
+// Default render function and extension.
+$render_function = 'theme_render_template';
+$extension = '.tpl.php';
+// The theme engine may use a different extension and a different renderer.
+global $theme_engine;
+if (isset($theme_engine)) {
+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 = $extension_function();
+}
+}
+}
+// In some cases, a template implementation may not have had
+// template_preprocess() run (for example, if the default implementation is
+// a function, but a template overrides that default implementation). In
+// these cases, a template should still be able to expect to have access to
+// the variables provided by template_preprocess(), so we add them here if
+// they don't already exist. We don't want to run template_preprocess()
+// twice (it would be inefficient and mess up zebra striping), so we use the
+// 'directory' variable to determine if it has already run, which while not
+// completely intuitive, is reasonably safe, and allows us to save on the
+// overhead of adding some new variable to track that.
+if (!isset($variables['directory'])) {
+$default_template_variables = array();
+template_preprocess($default_template_variables, $hook);
+$variables += $default_template_variables;
+}
+// Render the output using the template file.
+$template_file = $info['template'] . $extension;
+if (isset($info['path'])) {
+$template_file = $info['path'] . '/' . $template_file;
+}
+if (variable_get('theme_debug', FALSE)) {
+$output = _theme_render_template_debug($render_function, $template_file, $variables, $extension);
+}
+else {
+$output = $render_function($template_file, $variables);
+}
+}
+// restore path_to_theme()
+$theme_path = $temp;
+return $output;
+}
+/**
+* Returns the path to the current themed element.
+*
+* It can point to the active theme or the module handling a themed
+* implementation. For example, when invoked within the scope of a theming call
+* it will depend on where the theming function is handled. If implemented from
+* a module, it will point to the module. If implemented from the active theme,
+* it will point to the active theme. When called outside the scope of a
+* theming call, it will always point to the active theme.
+*/
+function path_to_theme() {
+global $theme_path;
+if (!isset($theme_path)) {
+drupal_theme_initialize();
+}
+return $theme_path;
+}
+/**
+* Allows themes and/or theme engines to discover overridden theme functions.
+*
+* @param $cache
+*   The existing cache of theme hooks to test against.
+* @param $prefixes
+*   An array of prefixes to test, in reverse order of importance.
+*
+* @return $implementations
+*   The functions found, suitable for returning from hook_theme;
+*/
+function drupal_find_theme_functions($cache, $prefixes) {
+$implementations = array();
+$functions = get_defined_functions();
+$theme_functions = preg_grep('/^(' . implode(')|(', $prefixes) . ')_/', $functions['user']);
+foreach ($cache as $hook => $info) {
+foreach ($prefixes as $prefix) {
+// Find theme functions that implement possible "suggestion" variants of
+// registered theme hooks and add those as new registered theme hooks.
+// The 'pattern' key defines a common prefix that all suggestions must
+// start with. The default is the name of the hook followed by '__'. An
+// 'base hook' key is added to each entry made for a found suggestion,
+// so that common functionality can be implemented for all suggestions of
+// the same base hook. To keep things simple, deep hierarchy of
+// suggestions is not supported: each suggestion's 'base hook' key
+// refers to a base hook, not to another suggestion, and all suggestions
+// are found using the base hook's pattern, not a pattern from an
+// intermediary suggestion.
+$pattern = isset($info['pattern']) ? $info['pattern'] : ($hook . '__');
+if (!isset($info['base hook']) && !empty($pattern)) {
+$matches = preg_grep('/^' . $prefix . '_' . $pattern . '/', $theme_functions);
+if ($matches) {
+foreach ($matches as $match) {
+$new_hook = substr($match, strlen($prefix) + 1);
+$arg_name = isset($info['variables']) ? 'variables' : 'render element';
+$implementations[$new_hook] = array(
+'function' => $match,
+$arg_name => $info[$arg_name],
+'base hook' => $hook,
+);
+}
+}
+}
+// Find theme functions that implement registered theme hooks and include
+// that in what is returned so that the registry knows that the theme has
+// this implementation.
+if (function_exists($prefix . '_' . $hook)) {
+$implementations[$hook] = array(
+'function' => $prefix . '_' . $hook,
+);
+}
+}
+}
+return $implementations;
+}
+/**
+* Allows themes and/or theme engines to easily discover overridden templates.
+*
+* @param $cache
+*   The existing cache of theme hooks to test against.
+* @param $extension
+*   The extension that these templates will have.
+* @param $path
+*   The path to search.
+*/
+function drupal_find_theme_templates($cache, $extension, $path) {
+$implementations = 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('.', '\.', $extension) . '$/';
+// Get a listing of all template files in the path to search.
+$files = drupal_system_listing($regex, $path, 'name', 0);
+// Find templates that implement registered theme hooks and include that in
+// what is returned so that the registry knows that the theme has this
+// implementation.
+foreach ($files as $template => $file) {
+// Ignore sub-theme templates for the current theme.
+if (strpos($file->uri, str_replace($subtheme_paths, '', $file->uri)) !== 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[$hook])) {
+$implementations[$hook] = array(
+'template' => $template,
+'path' => dirname($file->uri),
+);
+}
+}
+// Find templates that implement possible "suggestion" variants of registered
+// theme hooks and add those as new registered theme hooks. See
+// drupal_find_theme_functions() for more information about suggestions and
+// the use of 'pattern' and 'base hook'.
+$patterns = array_keys($files);
+foreach ($cache as $hook => $info) {
+$pattern = isset($info['pattern']) ? $info['pattern'] : ($hook . '__');
+if (!isset($info['base hook']) && !empty($pattern)) {
+// Transform _ in pattern to - to match file naming scheme
+// for the purposes of searching.
+$pattern = strtr($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.
+$arg_name = isset($info['variables']) ? 'variables' : 'render element';
+$implementations[strtr($file, '-', '_')] = array(
+'template' => $file,
+'path' => dirname($files[$match]->uri),
+$arg_name => $info[$arg_name],
+'base hook' => $hook,
+);
+}
+}
+}
+}
+return $implementations;
+}
+/**
+* Retrieves a setting for the current theme or for a given theme.
+*
+* The final setting is obtained from the last value found in the following
+* sources:
+* - the default global settings specified in this function
+* - the default theme-specific settings defined in any base theme's .info file
+* - the default theme-specific settings defined in the theme's .info file
+* - the saved values from the global theme settings form
+* - the saved values from the theme's settings form
+* To only retrieve the default global theme setting, an empty string should be
+* given for $theme.
+*
+* @param $setting_name
+*   The name of the setting to be retrieved.
+* @param $theme
+*   The name of a given theme; defaults to the current theme.
+*
+* @return
+*   The value of the requested setting, NULL if the setting does not exist.
+*/
+function theme_get_setting($setting_name, $theme = NULL) {
+$cache = &drupal_static(__FUNCTION__, array());
+// If no key is given, use the current theme if we can determine it.
+if (!isset($theme)) {
+$theme = !empty($GLOBALS['theme_key']) ? $GLOBALS['theme_key'] : '';
+}
+if (empty($cache[$theme])) {
+// Set the default values for each global setting.
+// To add new global settings, add their default values below, and then
+// add form elements to system_theme_settings() in system.admin.inc.
+$cache[$theme] = array(
+'default_logo'                     =>  1,
+'logo_path'                        =>  '',
+'default_favicon'                  =>  1,
+'favicon_path'                     =>  '',
+// Use the IANA-registered MIME type for ICO files as default.
+'favicon_mimetype'                 =>  'image/vnd.microsoft.icon',
+);
+// Turn on all default features.
+$features = _system_default_theme_features();
+foreach ($features as $feature) {
+$cache[$theme]['toggle_' . $feature] = 1;
+}
+// Get the values for the theme-specific settings from the .info files of
+// the theme and all its base themes.
+if ($theme) {
+$themes = list_themes();
+$theme_object = $themes[$theme];
+// Create a list which includes the current theme and all its base themes.
+if (isset($theme_object->base_themes)) {
+$theme_keys = array_keys($theme_object->base_themes);
+$theme_keys[] = $theme;
+}
+else {
+$theme_keys = array($theme);
+}
+foreach ($theme_keys as $theme_key) {
+if (!empty($themes[$theme_key]->info['settings'])) {
+$cache[$theme] = array_merge($cache[$theme], $themes[$theme_key]->info['settings']);
+}
+}
+}
+// Get the saved global settings from the database.
+$cache[$theme] = array_merge($cache[$theme], variable_get('theme_settings', array()));
+if ($theme) {
+// Get the saved theme-specific settings from the database.
+$cache[$theme] = array_merge($cache[$theme], variable_get('theme_' . $theme . '_settings', array()));
+// If the theme does not support a particular feature, override the global
+// setting and set the value to NULL.
+if (!empty($theme_object->info['features'])) {
+foreach ($features as $feature) {
+if (!in_array($feature, $theme_object->info['features'])) {
+$cache[$theme]['toggle_' . $feature] = NULL;
+}
+}
+}
+// Generate the path to the logo image.
+if ($cache[$theme]['toggle_logo']) {
+if ($cache[$theme]['default_logo']) {
+$cache[$theme]['logo'] = file_create_url(dirname($theme_object->filename) . '/logo.png');
+}
+elseif ($cache[$theme]['logo_path']) {
+$cache[$theme]['logo'] = file_create_url($cache[$theme]['logo_path']);
+}
+}
+// Generate the path to the favicon.
+if ($cache[$theme]['toggle_favicon']) {
+if ($cache[$theme]['default_favicon']) {
+if (file_exists($favicon = dirname($theme_object->filename) . '/favicon.ico')) {
+$cache[$theme]['favicon'] = file_create_url($favicon);
+}
+else {
+$cache[$theme]['favicon'] = file_create_url('misc/favicon.ico');
+}
+}
+elseif ($cache[$theme]['favicon_path']) {
+$cache[$theme]['favicon'] = file_create_url($cache[$theme]['favicon_path']);
+}
+else {
+$cache[$theme]['toggle_favicon'] = FALSE;
+}
+}
+}
+}
+return isset($cache[$theme][$setting_name]) ? $cache[$theme][$setting_name] : NULL;
+}
+/**
+* Renders a system default template, which is essentially a PHP template.
+*
+* @param $template_file
+*   The filename of the template to render.
+* @param $variables
+*   A keyed array of variables that will appear in the output.
+*
+* @return
+*   The output generated by the template.
+*/
+function theme_render_template($template_file, $variables) {
+// Extract the variables to a local namespace
+extract($variables, EXTR_SKIP);
+// Start output buffering
+ob_start();
+// Include the template file
+include DRUPAL_ROOT . '/' . $template_file;
+// End buffering and return its contents
+return ob_get_clean();
+}
+/**
+* Renders a template for any engine.
+*
+* Includes the possibility to get debug output by setting the
+* theme_debug variable to TRUE.
+*
+* @param string $template_function
+*   The function to call for rendering the template.
+* @param string $template_file
+*   The filename of the template to render.
+* @param array $variables
+*   A keyed array of variables that will appear in the output.
+* @param string $extension
+*   The extension used by the theme engine for template files.
+*
+* @return string
+*   The output generated by the template including debug information.
+*/
+function _theme_render_template_debug($template_function, $template_file, $variables, $extension) {
+$output = array(
+'debug_prefix' => '',
+'debug_info' => '',
+'rendered_markup' => call_user_func($template_function, $template_file, $variables),
+'debug_suffix' => '',
+);
+$output['debug_prefix'] .= "\n\n<!-- THEME DEBUG -->";
+$output['debug_prefix'] .= "\n<!-- CALL: theme('" . check_plain($variables['theme_hook_original']) . "') -->";
+// If there are theme suggestions, reverse the array so more specific
+// suggestions are shown first.
+if (!empty($variables['theme_hook_suggestions'])) {
+$variables['theme_hook_suggestions'] = array_reverse($variables['theme_hook_suggestions']);
+}
+// Add debug output for directly called suggestions like
+// '#theme' => 'comment__node__article'.
+if (strpos($variables['theme_hook_original'], '__') !== FALSE) {
+$derived_suggestions[] = $hook = $variables['theme_hook_original'];
+while ($pos = strrpos($hook, '__')) {
+$hook = substr($hook, 0, $pos);
+$derived_suggestions[] = $hook;
+}
+// Get the value of the base hook (last derived suggestion) and append it
+// to the end of all theme suggestions.
+$base_hook = array_pop($derived_suggestions);
+$variables['theme_hook_suggestions'] = array_merge($derived_suggestions, $variables['theme_hook_suggestions']);
+$variables['theme_hook_suggestions'][] = $base_hook;
+}
+if (!empty($variables['theme_hook_suggestions'])) {
+$current_template = basename($template_file);
+$suggestions = $variables['theme_hook_suggestions'];
+// Only add the original theme hook if it wasn't a directly called
+// suggestion.
+if (strpos($variables['theme_hook_original'], '__') === FALSE) {
+$suggestions[] = $variables['theme_hook_original'];
+}
+foreach ($suggestions as &$suggestion) {
+$template = strtr($suggestion, '_', '-') . $extension;
+$prefix = ($template == $current_template) ? 'x' : '*';
+$suggestion = $prefix . ' ' . $template;
+}
+$output['debug_info'] .= "\n<!-- FILE NAME SUGGESTIONS:\n   " . check_plain(implode("\n   ", $suggestions)) . "\n-->";
+}
+$output['debug_info'] .= "\n<!-- BEGIN OUTPUT from '" . check_plain($template_file) . "' -->\n";
+$output['debug_suffix'] .= "\n<!-- END OUTPUT from '" . check_plain($template_file) . "' -->\n\n";
+return implode('', $output);
+}
+/**
+* Enables a given list of themes.
+*
+* @param $theme_list
+*   An array of theme names.
+*/
+function theme_enable($theme_list) {
+drupal_clear_css_cache();
+foreach ($theme_list as $key) {
+db_update('system')
+->fields(array('status' => 1))
+->condition('type', 'theme')
+->condition('name', $key)
+->execute();
+}
+list_themes(TRUE);
+menu_rebuild();
+drupal_theme_rebuild();
+// Invoke hook_themes_enabled() after the themes have been enabled.
+module_invoke_all('themes_enabled', $theme_list);
+}
+/**
+* Disables a given list of themes.
+*
+* @param $theme_list
+*   An array of theme names.
+*/
+function theme_disable($theme_list) {
+// Don't disable the default theme.
+if ($pos = array_search(variable_get('theme_default', 'bartik'), $theme_list) !== FALSE) {
+unset($theme_list[$pos]);
+if (empty($theme_list)) {
+return;
+}
+}
+drupal_clear_css_cache();
+foreach ($theme_list as $key) {
+db_update('system')
+->fields(array('status' => 0))
+->condition('type', 'theme')
+->condition('name', $key)
+->execute();
+}
+list_themes(TRUE);
+menu_rebuild();
+drupal_theme_rebuild();
+// Invoke hook_themes_disabled after the themes have been disabled.
+module_invoke_all('themes_disabled', $theme_list);
+}
+/**
+* @addtogroup themeable
+* @{
+*/
+/**
+* Returns HTML for status and/or error messages, grouped by type.
+*
+* An invisible heading identifies the messages for assistive technology.
+* Sighted users see a colored box. See http://www.w3.org/TR/WCAG-TECHS/H69.html
+* for info.
+*
+* @param $variables
+*   An associative array containing:
+*   - display: (optional) Set to 'status' or 'error' to display only messages
+*     of that type.
+*/
+function theme_status_messages($variables) {
+$display = $variables['display'];
+$output = '';
+$status_heading = array(
+'status' => t('Status message'),
+'error' => t('Error message'),
+'warning' => t('Warning message'),
+);
+foreach (drupal_get_messages($display) as $type => $messages) {
+$output .= "<div class=\"messages $type\">\n";
+if (!empty($status_heading[$type])) {
+$output .= '<h2 class="element-invisible">' . $status_heading[$type] . "</h2>\n";
+}
+if (count($messages) > 1) {
+$output .= " <ul>\n";
+foreach ($messages as $message) {
+$output .= '  <li>' . $message . "</li>\n";
+}
+$output .= " </ul>\n";
+}
+else {
+$output .= reset($messages);
+}
+$output .= "</div>\n";
+}
+return $output;
+}
+/**
+* Returns HTML for a link.
+*
+* All Drupal code that outputs a link should call the l() function. That
+* function performs some initial preprocessing, and then, if necessary, calls
+* theme('link') for rendering the anchor tag.
+*
+* To optimize performance for sites that don't need custom theming of links,
+* the l() function includes an inline copy of this function, and uses that
+* copy if none of the enabled modules or the active theme implement any
+* preprocess or process functions or override this theme implementation.
+*
+* @param array $variables
+*   An associative array containing the keys:
+*   - text: The text of the link.
+*   - path: The internal path or external URL being linked to. It is used as
+*     the $path parameter of the url() function.
+*   - options: (optional) An array that defaults to empty, but can contain:
+*     - attributes: Can contain optional attributes:
+*       - class: must be declared in an array. Example: 'class' =>
+*         array('class_name1','class_name2').
+*       - title: must be a string. Example: 'title' => 'Example title'
+*       - Others are more flexible as long as they work with
+*         drupal_attributes($variables['options']['attributes]).
+*     - html: Boolean flag that tells whether text contains HTML or plain
+*       text. If set to TRUE, the text value will not be sanitized so the
+calling function must ensure that it already contains safe HTML.
+*   The elements $variables['options']['attributes'] and
+*   $variables['options']['html'] are used in this function similarly to the
+*   way that $options['attributes'] and $options['html'] are used in l().
+*   The link itself is built by the url() function, which takes
+*   $variables['path'] and $variables['options'] as arguments.
+*
+* @see l()
+* @see url()
+*/
+function theme_link($variables) {
+return '<a href="' . check_plain(url($variables['path'], $variables['options'])) . '"' . drupal_attributes($variables['options']['attributes']) . '>' . ($variables['options']['html'] ? $variables['text'] : check_plain($variables['text'])) . '</a>';
+}
+/**
+* Returns HTML for a set of links.
+*
+* @param $variables
+*   An associative array containing:
+*   - links: An associative array of links to be themed. The key for each link
+*     is used as its CSS class. Each link should be itself an array, with the
+*     following elements:
+*     - title: The link text.
+*     - href: The link URL. If omitted, the 'title' is shown as a plain text
+*       item in the links list.
+*     - html: (optional) Whether or not 'title' is HTML. If set, the title
+*       will not be passed through check_plain().
+*     - attributes: (optional) Attributes for the anchor, or for the <span>
+*       tag used in its place if no 'href' is supplied. If element 'class' is
+*       included, it must be an array of one or more class names.
+*     If the 'href' element is supplied, the entire link array is passed to
+*     l() as its $options parameter.
+*   - attributes: A keyed array of attributes for the UL containing the
+*     list of links.
+*   - heading: (optional) A heading to precede the links. May be an
+*     associative array or a string. If it's an array, it can have the
+*     following elements:
+*     - text: The heading text.
+*     - level: The heading level (e.g. 'h2', 'h3').
+*     - class: (optional) An array of the CSS classes for the heading.
+*     When using a string it will be used as the text of the heading and the
+*     level will default to 'h2'. Headings should be used on navigation menus
+*     and any list of links that consistently appears on multiple pages. To
+*     make the heading invisible use the 'element-invisible' CSS class. Do not
+*     use 'display:none', which removes it from screen-readers and assistive
+*     technology. Headings allow screen-reader and keyboard only users to
+*     navigate to or skip the links. See
+*     http://juicystudio.com/article/screen-readers-display-none.php and
+*     http://www.w3.org/TR/WCAG-TECHS/H42.html for more information.
+*/
+function theme_links($variables) {
+$links = $variables['links'];
+$attributes = $variables['attributes'];
+$heading = $variables['heading'];
+global $language_url;
+$output = '';
+if (count($links) > 0) {
+// Treat the heading first if it is present to prepend it to the
+// list of links.
+if (!empty($heading)) {
+if (is_string($heading)) {
+// Prepare the array that will be used when the passed heading
+// is a string.
+$heading = array(
+'text' => $heading,
+// Set the default level of the heading.
+'level' => 'h2',
+);
+}
+$output .= '<' . $heading['level'];
+if (!empty($heading['class'])) {
+$output .= drupal_attributes(array('class' => $heading['class']));
+}
+$output .= '>' . check_plain($heading['text']) . '</' . $heading['level'] . '>';
+}
+$output .= '<ul' . drupal_attributes($attributes) . '>';
+$num_links = count($links);
+$i = 1;
+foreach ($links as $key => $link) {
+$class = array($key);
+// Add first, last and active classes to the list of links to help out
+// themers.
+if ($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()))
+&& (empty($link['language']) || $link['language']->language == $language_url->language)) {
+$class[] = 'active';
+}
+$output .= '<li' . drupal_attributes(array('class' => $class)) . '>';
+if (isset($link['href'])) {
+// Pass in $link as $options, they share the same keys.
+$output .= l($link['title'], $link['href'], $link);
+}
+elseif (!empty($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;
+}
+/**
+* Returns HTML for an image.
+*
+* @param $variables
+*   An associative array containing:
+*   - path: Either the path of the image file (relative to base_path()) or a
+*     full URL.
+*   - width: The width of the image (if known).
+*   - height: The height of the image (if known).
+*   - alt: The alternative text for text-based browsers. HTML 4 and XHTML 1.0
+*     always require an alt attribute. The HTML 5 draft allows the alt
+*     attribute to be omitted in some cases. Therefore, this variable defaults
+*     to an empty string, but can be set to NULL for the attribute to be
+*     omitted. Usually, neither omission nor an empty string satisfies
+*     accessibility requirements, so it is strongly encouraged for code
+*     calling theme('image') to pass a meaningful value for this variable.
+*     - http://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
+*     - http://www.w3.org/TR/xhtml1/dtds.html
+*     - http://dev.w3.org/html5/spec/Overview.html#alt
+*   - title: The title text is displayed when the image is hovered in some
+*     popular browsers.
+*   - attributes: Associative array of attributes to be placed in the img tag.
+*/
+function theme_image($variables) {
+$attributes = $variables['attributes'];
+$attributes['src'] = file_create_url($variables['path']);
+foreach (array('width', 'height', 'alt', 'title') as $key) {
+if (isset($variables[$key])) {
+$attributes[$key] = $variables[$key];
+}
+}
+return '<img' . drupal_attributes($attributes) . ' />';
+}
+/**
+* Returns HTML for a breadcrumb trail.
+*
+* @param $variables
+*   An associative array containing:
+*   - breadcrumb: An array containing the breadcrumb links.
+*/
+function theme_breadcrumb($variables) {
+$breadcrumb = $variables['breadcrumb'];
+if (!empty($breadcrumb)) {
+// Provide a navigational heading to give context for breadcrumb links to
+// screen-reader users. Make the heading invisible with .element-invisible.
+$output = '<h2 class="element-invisible">' . t('You are here') . '</h2>';
+$output .= '<div class="breadcrumb">' . implode(' » ', $breadcrumb) . '</div>';
+return $output;
+}
+}
+/**
+* Returns HTML for a table.
+*
+* @param $variables
+*   An associative array containing:
+*   - header: An array containing the table headers. Each element of the array
+*     can be either a localized string or an associative array with the
+*     following keys:
+*     - "data": The localized title of the table column.
+*     - "field": The database field represented in the table column (required
+*       if user is to be able to sort on this column).
+*     - "sort": A default sort order for this column ("asc" or "desc"). Only
+*       one column should be given a default sort order because table sorting
+*       only applies to one column at a time.
+*     - Any HTML attributes, such as "colspan", to apply to the column header
+*       cell.
+*   - rows: An array of table rows. Every row is an array of cells, or an
+*     associative array with the following keys:
+*     - "data": an array of cells
+*     - Any HTML attributes, such as "class", to apply to the table row.
+*     - "no_striping": a boolean indicating that the row should receive no
+*       'even / odd' styling. Defaults to FALSE.
+*     Each cell can be either a string or an associative array with the
+*     following keys:
+*     - "data": The string to display in the table cell.
+*     - "header": Indicates this cell is a header.
+*     - Any HTML attributes, such as "colspan", to apply to the table cell.
+*     Here's an example for $rows:
+*     @code
+*     $rows = array(
+*       // Simple row
+*       array(
+*         'Cell 1', 'Cell 2', 'Cell 3'
+*       ),
+*       // Row with attributes on the row and some of its cells.
+*       array(
+*         'data' => array('Cell 1', array('data' => 'Cell 2', 'colspan' => 2)), 'class' => array('funky')
+*       )
+*     );
+*     @endcode
+*   - attributes: An array of HTML attributes to apply to the table tag.
+*   - caption: A localized string to use for the <caption> tag.
+*   - colgroups: An array of column groups. Each element of the array can be
+*     either:
+*     - An array of columns, each of which is an associative array of HTML
+*       attributes applied to the COL element.
+*     - An array of attributes applied to the COLGROUP element, which must
+*       include a "data" attribute. To add attributes to COL elements, set the
+*       "data" attribute with an array of columns, each of which is an
+*       associative array of HTML attributes.
+*     Here's an example for $colgroup:
+*     @code
+*     $colgroup = array(
+*       // COLGROUP with one COL element.
+*       array(
+*         array(
+*           'class' => array('funky'), // Attribute for the COL element.
+*         ),
+*       ),
+*       // Colgroup with attributes and inner COL elements.
+*       array(
+*         'data' => array(
+*           array(
+*             'class' => array('funky'), // Attribute for the COL element.
+*           ),
+*         ),
+*         'class' => array('jazzy'), // Attribute for the COLGROUP element.
+*       ),
+*     );
+*     @endcode
+*     These optional tags are used to group and set properties on columns
+*     within a table. For example, one may easily group three columns and
+*     apply same background style to all.
+*   - sticky: Use a "sticky" table header.
+*   - empty: The message to display in an extra row if table does not have any
+*     rows.
+*/
+function theme_table($variables) {
+$header = $variables['header'];
+$rows = $variables['rows'];
+$attributes = $variables['attributes'];
+$caption = $variables['caption'];
+$colgroups = $variables['colgroups'];
+$sticky = $variables['sticky'];
+$empty = $variables['empty'];
+// Add sticky headers, if applicable.
+if (count($header) && $sticky) {
+drupal_add_js('misc/tableheader.js');
+// Add 'sticky-enabled' class to the table to identify it for JS.
+// This is needed to target tables constructed by this function.
+$attributes['class'][] = '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";
+}
+}
+}
+// Add the 'empty' row message if available.
+if (!count($rows) && $empty) {
+$header_count = 0;
+foreach ($header as $header_cell) {
+if (is_array($header_cell)) {
+$header_count += isset($header_cell['colspan']) ? $header_cell['colspan'] : 1;
+}
+else {
+$header_count++;
+}
+}
+$rows[] = array(array('data' => $empty, 'colspan' => $header_count, 'class' => array('empty', 'message')));
+}
+// Format the table header:
+if (count($header)) {
+$ts = tablesort_init($header);
+// HTML requires that the thead tag has tr tags in it followed 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 => $row) {
+// Check if we're dealing with a simple or complex row
+if (isset($row['data'])) {
+$cells = $row['data'];
+$no_striping = isset($row['no_striping']) ? $row['no_striping'] : FALSE;
+// Set the attributes array and exclude 'data' and 'no_striping'.
+$attributes = $row;
+unset($attributes['data']);
+unset($attributes['no_striping']);
+}
+else {
+$cells = $row;
+$attributes = array();
+$no_striping = FALSE;
+}
+if (count($cells)) {
+// Add odd/even class
+if (!$no_striping) {
+$class = $flip[$class];
+$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;
+}
+/**
+* Returns HTML for a sort icon.
+*
+* @param $variables
+*   An associative array containing:
+*   - style: Set to either 'asc' or 'desc', this determines which icon to
+*     show.
+*/
+function theme_tablesort_indicator($variables) {
+if ($variables['style'] == "asc") {
+return theme('image', array('path' => 'misc/arrow-asc.png', 'width' => 13, 'height' => 13, 'alt' => t('sort ascending'), 'title' => t('sort ascending')));
+}
+else {
+return theme('image', array('path' => 'misc/arrow-desc.png', 'width' => 13, 'height' => 13, 'alt' => t('sort descending'), 'title' => t('sort descending')));
+}
+}
+/**
+* Returns HTML for a marker for new or updated content.
+*
+* @param $variables
+*   An associative array containing:
+*   - type: Number representing the marker type to display. See MARK_NEW,
+*     MARK_UPDATED, MARK_READ.
+*/
+function theme_mark($variables) {
+$type = $variables['type'];
+global $user;
+if ($user->uid) {
+if ($type == MARK_NEW) {
+return ' <span class="marker">' . t('new') . '</span>';
+}
+elseif ($type == MARK_UPDATED) {
+return ' <span class="marker">' . t('updated') . '</span>';
+}
+}
+}
+/**
+* Returns HTML for a list or nested list of items.
+*
+* @param $variables
+*   An associative array containing:
+*   - items: An array of items to be displayed in the list. If an item is a
+*     string, then it is used as is. If an item is an array, then the "data"
+*     element of the array is used as the contents of the list item. If an item
+*     is an array with a "children" element, those children are displayed in a
+*     nested list. All other elements are treated as attributes of the list
+*     item element.
+*   - title: The title of the list.
+*   - type: The type of list to return (e.g. "ul", "ol").
+*   - attributes: The attributes applied to the list element.
+*/
+function theme_item_list($variables) {
+$items = $variables['items'];
+$title = $variables['title'];
+$type = $variables['type'];
+$attributes = $variables['attributes'];
+// Only output the list container and title, if there are any list items.
+// Check to see whether the block title exists before adding a header.
+// Empty headers are not semantic and present accessibility challenges.
+$output = '<div class="item-list">';
+if (isset($title) && $title !== '') {
+$output .= '<h3>' . $title . '</h3>';
+}
+if (!empty($items)) {
+$output .= "<$type" . drupal_attributes($attributes) . '>';
+$num_items = count($items);
+$i = 0;
+foreach ($items as $item) {
+$attributes = array();
+$children = array();
+$data = '';
+$i++;
+if (is_array($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) {
+// Render nested list.
+$data .= theme_item_list(array('items' => $children, 'title' => NULL, 'type' => $type, 'attributes' => $attributes));
+}
+if ($i == 1) {
+$attributes['class'][] = 'first';
+}
+if ($i == $num_items) {
+$attributes['class'][] = 'last';
+}
+$output .= '<li' . drupal_attributes($attributes) . '>' . $data . "</li>\n";
+}
+$output .= "</$type>";
+}
+$output .= '</div>';
+return $output;
+}
+/**
+* Returns HTML for a "more help" link.
+*
+* @param $variables
+*   An associative array containing:
+*   - url: The URL for the link.
+*/
+function theme_more_help_link($variables) {
+return '<div class="more-help-link">' . l(t('More help'), $variables['url']) . '</div>';
+}
+/**
+* Returns HTML for a feed icon.
+*
+* @param $variables
+*   An associative array containing:
+*   - url: An internal system path or a fully qualified external URL of the
+*     feed.
+*   - title: A descriptive title of the feed.
+*/
+function theme_feed_icon($variables) {
+$text = t('Subscribe to !feed-title', array('!feed-title' => $variables['title']));
+if ($image = theme('image', array('path' => 'misc/feed.png', 'width' => 16, 'height' => 16, 'alt' => $text))) {
+return l($image, $variables['url'], array('html' => TRUE, 'attributes' => array('class' => array('feed-icon'), 'title' => $text)));
+}
+}
+/**
+* Returns HTML for a generic HTML tag with attributes.
+*
+* @param $variables
+*   An associative array containing:
+*   - element: An associative array describing the tag:
+*     - #tag: The tag name to output. Typical tags added to the HTML HEAD:
+*       - meta: To provide meta information, such as a page refresh.
+*       - link: To refer to stylesheets and other contextual information.
+*       - script: To load JavaScript.
+*     - #attributes: (optional) An array of HTML attributes to apply to the
+*       tag.
+*     - #value: (optional) A string containing tag content, such as inline
+*       CSS.
+*     - #value_prefix: (optional) A string to prepend to #value, e.g. a CDATA
+*       wrapper prefix.
+*     - #value_suffix: (optional) A string to append to #value, e.g. a CDATA
+*       wrapper suffix.
+*/
+function theme_html_tag($variables) {
+$element = $variables['element'];
+$attributes = isset($element['#attributes']) ? drupal_attributes($element['#attributes']) : '';
+if (!isset($element['#value'])) {
+return '<' . $element['#tag'] . $attributes . " />\n";
+}
+else {
+$output = '<' . $element['#tag'] . $attributes . '>';
+if (isset($element['#value_prefix'])) {
+$output .= $element['#value_prefix'];
+}
+$output .= $element['#value'];
+if (isset($element['#value_suffix'])) {
+$output .= $element['#value_suffix'];
+}
+$output .= '</' . $element['#tag'] . ">\n";
+return $output;
+}
+}
+/**
+* Returns HTML for a "more" link, like those used in blocks.
+*
+* @param $variables
+*   An associative array containing:
+*   - url: The URL of the main page.
+*   - title: A descriptive verb for the link, like 'Read more'.
+*/
+function theme_more_link($variables) {
+return '<div class="more-link">' . l(t('More'), $variables['url'], array('attributes' => array('title' => $variables['title']))) . '</div>';
+}
+/**
+* Returns HTML for a username, potentially linked to the user's page.
+*
+* @param $variables
+*   An associative array containing:
+*   - account: The user object to format.
+*   - name: The user's name, sanitized.
+*   - extra: Additional text to append to the user's name, sanitized.
+*   - link_path: The path or URL of the user's profile page, home page, or
+*     other desired page to link to for more information about the user.
+*   - link_options: An array of options to pass to the l() function's $options
+*     parameter if linking the user's name to the user's page.
+*   - attributes_array: An array of attributes to pass to the
+*     drupal_attributes() function if not linking to the user's page.
+*
+* @see template_preprocess_username()
+* @see template_process_username()
+*/
+function theme_username($variables) {
+if (isset($variables['link_path'])) {
+// We have a link path, so we should generate a link using l().
+// Additional classes may be added as array elements like
+// $variables['link_options']['attributes']['class'][] = 'myclass';
+$output = l($variables['name'] . $variables['extra'], $variables['link_path'], $variables['link_options']);
+}
+else {
+// Modules may have added important attributes so they must be included
+// in the output. Additional classes may be added as array elements like
+// $variables['attributes_array']['class'][] = 'myclass';
+$output = '<span' . drupal_attributes($variables['attributes_array']) . '>' . $variables['name'] . $variables['extra'] . '</span>';
+}
+return $output;
+}
+/**
+* Returns HTML for a progress bar.
+*
+* Note that the core Batch API uses this only for non-JavaScript batch jobs.
+*
+* @param $variables
+*   An associative array containing:
+*   - percent: The percentage of the progress.
+*   - message: A string containing information to be displayed.
+*/
+function theme_progress_bar($variables) {
+$output = '<div id="progress" class="progress">';
+$output .= '<div class="bar"><div class="filled" style="width: ' . $variables['percent'] . '%"></div></div>';
+$output .= '<div class="percentage">' . $variables['percent'] . '%</div>';
+$output .= '<div class="message">' . $variables['message'] . '</div>';
+$output .= '</div>';
+return $output;
+}
+/**
+* Returns HTML for an indentation div; used for drag and drop tables.
+*
+* @param $variables
+*   An associative array containing:
+*   - size: Optional. The number of indentations to create.
+*/
+function theme_indentation($variables) {
+$output = '';
+for ($n = 0; $n < $variables['size']; $n++) {
+$output .= '<div class="indentation">&nbsp;</div>';
+}
+return $output;
+}
+/**
+* @} End of "addtogroup themeable".
+*/
+/**
+* Returns HTML output for a single table cell for theme_table().
+*
+* @param $cell
+*   Array of cell information, or string to display in cell.
+* @param bool $header
+*   TRUE if this cell is a table header cell, FALSE if it is an ordinary
+*   table cell. If $cell is an array with element 'header' set to TRUE, that
+*   will override the $header parameter.
+*
+* @return
+*   HTML for the cell.
+*/
+function _theme_table_cell($cell, $header = FALSE) {
+$attributes = '';
+if (is_array($cell)) {
+$data = isset($cell['data']) ? $cell['data'] : '';
+// Cell's data property can be a string or a renderable array.
+if (is_array($data)) {
+$data = drupal_render($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 $output;
+}
+/**
+* Adds a default set of helper variables for variable processors and templates.
+*
+* This function is called for theme hooks implemented as templates only, not
+* for theme hooks implemented as functions. This preprocess function is the
+* first in the sequence of preprocessing and processing functions that is
+* called when preparing variables for a template. See theme() for more details
+* about the full sequence.
+*
+* @see theme()
+* @see template_process()
+*/
+function template_preprocess(&$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.
+$variables['directory'] = path_to_theme();
+// Initialize html class attribute for the current hook.
+$variables['classes_array'] = array(drupal_html_class($hook));
+// Merge in variables that don't depend on hook and don't change during a
+// single page request.
+// Use the advanced drupal_static() pattern, since this is called very often.
+static $drupal_static_fast;
+if (!isset($drupal_static_fast)) {
+$drupal_static_fast['default_variables'] = &drupal_static(__FUNCTION__);
+}
+$default_variables = &$drupal_static_fast['default_variables'];
+// Global $user object shouldn't change during a page request once rendering
+// has started, but if there's an edge case where it does, re-fetch the
+// variables appropriate for the new user.
+if (!isset($default_variables) || ($user !== $default_variables['user'])) {
+$default_variables = _template_preprocess_default_variables();
+}
+$variables += $default_variables;
+}
+/**
+* Returns hook-independent variables to template_preprocess().
+*/
+function _template_preprocess_default_variables() {
+global $user;
+// Variables that don't depend on a database connection.
+$variables = array(
+'attributes_array' => array(),
+'title_attributes_array' => array(),
+'content_attributes_array' => array(),
+'title_prefix' => array(),
+'title_suffix' => array(),
+'user' => $user,
+'db_is_active' => !defined('MAINTENANCE_MODE'),
+'is_admin' => FALSE,
+'logged_in' => FALSE,
+);
+// The user object has no uid property when the database does not exist during
+// install. The user_access() check deals with issues when in maintenance mode
+// as uid is set but the user.module has not been included.
+if (isset($user->uid) && function_exists('user_access')) {
+$variables['is_admin'] = user_access('access administration pages');
+$variables['logged_in'] = ($user->uid > 0);
+}
+// drupal_is_front_page() might throw an exception.
+try {
+$variables['is_front'] = drupal_is_front_page();
+}
+catch (Exception $e) {
+// If the database is not yet available, set default values for these
+// variables.
+$variables['is_front'] = FALSE;
+$variables['db_is_active'] = FALSE;
+}
+return $variables;
+}
+/**
+* Adds helper variables derived from variables defined during preprocessing.
+*
+* When preparing variables for a theme hook implementation, all 'preprocess'
+* functions run first, then all 'process' functions (see theme() for details
+* about the full sequence).
+*
+* This function serializes array variables manipulated during the preprocessing
+* phase into strings for convenient use by templates. As with
+* template_preprocess(), this function does not get called for theme hooks
+* implemented as functions.
+*
+* @see theme()
+* @see template_preprocess()
+*/
+function template_process(&$variables, $hook) {
+// Flatten out classes.
+$variables['classes'] = implode(' ', $variables['classes_array']);
+// Flatten out attributes, title_attributes, and content_attributes.
+// Because this function can be called very often, and often with empty
+// attributes, optimize performance by only calling drupal_attributes() if
+// necessary.
+$variables['attributes'] = $variables['attributes_array'] ? drupal_attributes($variables['attributes_array']) : '';
+$variables['title_attributes'] = $variables['title_attributes_array'] ? drupal_attributes($variables['title_attributes_array']) : '';
+$variables['content_attributes'] = $variables['content_attributes_array'] ? drupal_attributes($variables['content_attributes_array']) : '';
+}
+/**
+* Preprocess variables for html.tpl.php
+*
+* @see system_elements()
+* @see html.tpl.php
+*/
+function template_preprocess_html(&$variables) {
+// Compile a list of classes that are going to be applied to the body element.
+// This allows advanced theming based on context (home page, node of certain type, etc.).
+// Add a class that tells us whether we're on the front page or not.
+$variables['classes_array'][] = $variables['is_front'] ? 'front' : 'not-front';
+// Add a class that tells us whether the page is viewed by an authenticated user or not.
+$variables['classes_array'][] = $variables['logged_in'] ? 'logged-in' : 'not-logged-in';
+// Add information about the number of sidebars.
+if (!empty($variables['page']['sidebar_first']) && !empty($variables['page']['sidebar_second'])) {
+$variables['classes_array'][] = 'two-sidebars';
+}
+elseif (!empty($variables['page']['sidebar_first'])) {
+$variables['classes_array'][] = 'one-sidebar sidebar-first';
+}
+elseif (!empty($variables['page']['sidebar_second'])) {
+$variables['classes_array'][] = 'one-sidebar sidebar-second';
+}
+else {
+$variables['classes_array'][] = 'no-sidebars';
+}
+// Populate the body classes.
+if ($suggestions = theme_get_suggestions(arg(), 'page', '-')) {
+foreach ($suggestions as $suggestion) {
+if ($suggestion != 'page-front') {
+// Add current suggestion to page classes to make it possible to theme
+// the page depending on the current page type (e.g. node, admin, user,
+// etc.) as well as more specific data like node-12 or node-edit.
+$variables['classes_array'][] = drupal_html_class($suggestion);
+}
+}
+}
+// If on an individual node page, add the node type to body classes.
+if ($node = menu_get_object()) {
+$variables['classes_array'][] = drupal_html_class('node-type-' . $node->type);
+}
+// RDFa allows annotation of XHTML pages with RDF data, while GRDDL provides
+// mechanisms for extraction of this RDF content via XSLT transformation
+// using an associated GRDDL profile.
+$variables['rdf_namespaces']    = drupal_get_rdf_namespaces();
+$variables['grddl_profile']     = 'http://www.w3.org/1999/xhtml/vocab';
+$variables['language']          = $GLOBALS['language'];
+$variables['language']->dir     = $GLOBALS['language']->direction ? 'rtl' : 'ltr';
+// Add favicon.
+if (theme_get_setting('toggle_favicon')) {
+$favicon = theme_get_setting('favicon');
+$type = theme_get_setting('favicon_mimetype');
+drupal_add_html_head_link(array('rel' => 'shortcut icon', 'href' => drupal_strip_dangerous_protocols($favicon), 'type' => $type));
+}
+// Construct page title.
+if (drupal_get_title()) {
+$head_title = array(
+'title' => strip_tags(drupal_get_title()),
+'name' => check_plain(variable_get('site_name', 'Drupal')),
+);
+}
+else {
+$head_title = array('name' => check_plain(variable_get('site_name', 'Drupal')));
+if (variable_get('site_slogan', '')) {
+$head_title['slogan'] = filter_xss_admin(variable_get('site_slogan', ''));
+}
+}
+$variables['head_title_array'] = $head_title;
+$variables['head_title'] = implode(' | ', $head_title);
+// Populate the page template suggestions.
+if ($suggestions = theme_get_suggestions(arg(), 'html')) {
+$variables['theme_hook_suggestions'] = $suggestions;
+}
+}
+/**
+* Preprocess variables for page.tpl.php
+*
+* Most themes utilize their own copy of page.tpl.php. The default is located
+* inside "modules/system/page.tpl.php". Look in there for the full list of
+* variables.
+*
+* Uses the arg() function to generate a series of page template suggestions
+* based on the current path.
+*
+* Any changes to variables in this preprocessor should also be changed inside
+* template_preprocess_maintenance_page() to keep all of them consistent.
+*
+* @see drupal_render_page()
+* @see template_process_page()
+* @see page.tpl.php
+*/
+function template_preprocess_page(&$variables) {
+// Move some variables to the top level for themer convenience and template cleanliness.
+$variables['show_messages'] = $variables['page']['#show_messages'];
+foreach (system_region_list($GLOBALS['theme'], REGIONS_ALL, FALSE) as $region_key) {
+if (!isset($variables['page'][$region_key])) {
+$variables['page'][$region_key] = array();
+}
+if ($region_content = drupal_get_region_content($region_key)) {
+$variables['page'][$region_key][]['#markup'] = $region_content;
+}
+}
+// Set up layout variable.
+$variables['layout'] = 'none';
+if (!empty($variables['page']['sidebar_first'])) {
+$variables['layout'] = 'first';
+}
+if (!empty($variables['page']['sidebar_second'])) {
+$variables['layout'] = ($variables['layout'] == 'first') ? 'both' : 'second';
+}
+$variables['base_path']         = base_path();
+$variables['front_page']        = url();
+$variables['feed_icons']        = drupal_get_feeds();
+$variables['language']          = $GLOBALS['language'];
+$variables['language']->dir     = $GLOBALS['language']->direction ? 'rtl' : 'ltr';
+$variables['logo']              = theme_get_setting('logo');
+$variables['main_menu']         = theme_get_setting('toggle_main_menu') ? menu_main_menu() : array();
+$variables['secondary_menu']    = theme_get_setting('toggle_secondary_menu') ? menu_secondary_menu() : array();
+$variables['action_links']      = menu_local_actions();
+$variables['site_name']         = (theme_get_setting('toggle_name') ? filter_xss_admin(variable_get('site_name', 'Drupal')) : '');
+$variables['site_slogan']       = (theme_get_setting('toggle_slogan') ? filter_xss_admin(variable_get('site_slogan', '')) : '');
+$variables['tabs']              = menu_local_tabs();
+if ($node = menu_get_object()) {
+$variables['node'] = $node;
+}
+// Populate the page template suggestions.
+if ($suggestions = theme_get_suggestions(arg(), 'page')) {
+$variables['theme_hook_suggestions'] = $suggestions;
+}
+}
+/**
+* Process variables for page.tpl.php
+*
+* Perform final addition of variables before passing them into the template.
+* To customize these variables, simply set them in an earlier step.
+*
+* @see template_preprocess_page()
+* @see page.tpl.php
+*/
+function template_process_page(&$variables) {
+if (!isset($variables['breadcrumb'])) {
+// Build the breadcrumb last, so as to increase the chance of being able to
+// re-use the cache of an already rendered menu containing the active link
+// for the current page.
+// @see menu_tree_page_data()
+$variables['breadcrumb'] = theme('breadcrumb', array('breadcrumb' => drupal_get_breadcrumb()));
+}
+if (!isset($variables['title'])) {
+$variables['title'] = drupal_get_title();
+}
+// Generate messages last in order to capture as many as possible for the
+// current page.
+if (!isset($variables['messages'])) {
+$variables['messages'] = $variables['show_messages'] ? theme('status_messages') : '';
+}
+}
+/**
+* Process variables for html.tpl.php
+*
+* Perform final addition and modification of variables before passing into
+* the template. To customize these variables, call drupal_render() on elements
+* in $variables['page'] during THEME_preprocess_page().
+*
+* @see template_preprocess_html()
+* @see html.tpl.php
+*/
+function template_process_html(&$variables) {
+// Render page_top and page_bottom into top level variables.
+$variables['page_top'] = drupal_render($variables['page']['page_top']);
+$variables['page_bottom'] = drupal_render($variables['page']['page_bottom']);
+// Place the rendered HTML for the page body into a top level variable.
+$variables['page']              = $variables['page']['#children'];
+$variables['page_bottom'] .= drupal_get_js('footer');
+$variables['head']    = drupal_get_html_head();
+$variables['css']     = drupal_add_css();
+$variables['styles']  = drupal_get_css();
+$variables['scripts'] = drupal_get_js();
+}
+/**
+* Generate an array of suggestions from path arguments.
+*
+* This is typically called for adding to the 'theme_hook_suggestions' or
+* 'classes_array' variables from within preprocess functions, when wanting to
+* base the additional suggestions on the path of the current page.
+*
+* @param $args
+*   An array of path arguments, such as from function arg().
+* @param $base
+*   A string identifying the base 'thing' from which more specific suggestions
+*   are derived. For example, 'page' or 'html'.
+* @param $delimiter
+*   The string used to delimit increasingly specific information. The default
+*   of '__' is appropriate for theme hook suggestions. '-' is appropriate for
+*   extra classes.
+*
+* @return
+*   An array of suggestions, suitable for adding to
+*   $variables['theme_hook_suggestions'] within a preprocess function or to
+*   $variables['classes_array'] if the suggestions represent extra CSS classes.
+*/
+function theme_get_suggestions($args, $base, $delimiter = '__') {
+// Build a list of suggested theme hooks or body classes 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, for $base='page', http://www.example.com/node/1/edit would result
+// in the following suggestions and body classes:
+//
+// page__node              page-node
+// page__node__%           page-node-%
+// page__node__1           page-node-1
+// page__node__edit        page-node-edit
+$suggestions = array();
+$prefix = $base;
+foreach ($args as $arg) {
+// Remove slashes or null per SA-CORE-2009-003 and change - (hyphen) to _
+// (underscore).
+//
+// When we discover templates in @see drupal_find_theme_templates,
+// hyphens (-) are converted to underscores (_) before the theme hook
+// is registered. We do this because the hyphens used for delimiters
+// in hook suggestions cannot be used in the function names of the
+// associated preprocess functions. Any page templates designed to be used
+// on paths that contain a hyphen are also registered with these hyphens
+// converted to underscores so here we must convert any hyphens in path
+// arguments to underscores here before fetching theme hook suggestions
+// to ensure the templates are appropriately recognized.
+$arg = str_replace(array("/", "\\", "\0", '-'), array('', '', '', '_'), $arg);
+// The percent acts as a wildcard for numeric arguments since
+// asterisks are not valid filename characters on many filesystems.
+if (is_numeric($arg)) {
+$suggestions[] = $prefix . $delimiter . '%';
+}
+$suggestions[] = $prefix . $delimiter . $arg;
+if (!is_numeric($arg)) {
+$prefix .= $delimiter . $arg;
+}
+}
+if (drupal_is_front_page()) {
+// Front templates should be based on root only, not prefixed arguments.
+$suggestions[] = $base . $delimiter . 'front';
+}
+return $suggestions;
+}
+/**
+* Process variables for maintenance-page.tpl.php.
+*
+* The variables array generated here is a mirror of
+* template_preprocess_page(). This preprocessor will run its course when
+* theme_maintenance_page() is invoked. An alternate template file of
+* maintenance-page--offline.tpl.php can be used when the database is offline to
+* hide errors and completely replace the content.
+*
+* The $variables array contains the following arguments:
+* - $content
+*
+* @see maintenance-page.tpl.php
+*/
+function template_preprocess_maintenance_page(&$variables) {
+// Add favicon
+if (theme_get_setting('toggle_favicon')) {
+$favicon = theme_get_setting('favicon');
+$type = theme_get_setting('favicon_mimetype');
+drupal_add_html_head_link(array('rel' => 'shortcut icon', 'href' => drupal_strip_dangerous_protocols($favicon), 'type' => $type));
+}
+global $theme;
+// Retrieve the theme data to list all available regions.
+$theme_data = list_themes();
+$regions = $theme_data[$theme]->info['regions'];
+// Get all region content set with drupal_add_region_content().
+foreach (array_keys($regions) as $region) {
+// Assign region to a region variable.
+$region_content = drupal_get_region_content($region);
+isset($variables[$region]) ? $variables[$region] .= $region_content : $variables[$region] = $region_content;
+}
+// Setup layout variable.
+$variables['layout'] = 'none';
+if (!empty($variables['sidebar_first'])) {
+$variables['layout'] = 'first';
+}
+if (!empty($variables['sidebar_second'])) {
+$variables['layout'] = ($variables['layout'] == 'first') ? 'both' : 'second';
+}
+// Construct page title
+if (drupal_get_title()) {
+$head_title = array(
+'title' => strip_tags(drupal_get_title()),
+'name' => variable_get('site_name', 'Drupal'),
+);
+}
+else {
+$head_title = array('name' => variable_get('site_name', 'Drupal'));
+if (variable_get('site_slogan', '')) {
+$head_title['slogan'] = variable_get('site_slogan', '');
+}
+}
+// set the default language if necessary
+$language = isset($GLOBALS['language']) ? $GLOBALS['language'] : language_default();
+$variables['head_title_array']  = $head_title;
+$variables['head_title']        = implode(' | ', $head_title);
+$variables['base_path']         = base_path();
+$variables['front_page']        = url();
+$variables['breadcrumb']        = '';
+$variables['feed_icons']        = '';
+$variables['help']              = '';
+$variables['language']          = $language;
+$variables['language']->dir     = $language->direction ? 'rtl' : 'ltr';
+$variables['logo']              = theme_get_setting('logo');
+$variables['messages']          = $variables['show_messages'] ? theme('status_messages') : '';
+$variables['main_menu']         = array();
+$variables['secondary_menu']    = array();
+$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['tabs']              = '';
+$variables['title']             = drupal_get_title();
+// Compile a list of classes that are going to be applied to the body element.
+$variables['classes_array'][] = 'in-maintenance';
+if (isset($variables['db_is_active']) && !$variables['db_is_active']) {
+$variables['classes_array'][] = 'db-offline';
+}
+if ($variables['layout'] == 'both') {
+$variables['classes_array'][] = 'two-sidebars';
+}
+elseif ($variables['layout'] == 'none') {
+$variables['classes_array'][] = 'no-sidebars';
+}
+else {
+$variables['classes_array'][] = 'one-sidebar sidebar-' . $variables['layout'];
+}
+// Dead databases will show error messages so supplying this template will
+// allow themers to override the page and the content completely.
+if (isset($variables['db_is_active']) && !$variables['db_is_active']) {
+$variables['theme_hook_suggestion'] = 'maintenance_page__offline';
+}
+}
+/**
+* Theme process function for theme_maintenance_field().
+*
+* The variables array generated here is a mirror of template_process_html().
+* This processor will run its course when theme_maintenance_page() is invoked.
+*
+* @see maintenance-page.tpl.php
+* @see template_process_html()
+*/
+function template_process_maintenance_page(&$variables) {
+$variables['head']    = drupal_get_html_head();
+$variables['css']     = drupal_add_css();
+$variables['styles']  = drupal_get_css();
+$variables['scripts'] = drupal_get_js();
+}
+/**
+* Preprocess variables for region.tpl.php
+*
+* Prepares the values passed to the theme_region function to be passed into a
+* pluggable template engine. Uses the region name to generate a template file
+* suggestions. If none are found, the default region.tpl.php is used.
+*
+* @see drupal_region_class()
+* @see region.tpl.php
+*/
+function template_preprocess_region(&$variables) {
+// Create the $content variable that templates expect.
+$variables['content'] = $variables['elements']['#children'];
+$variables['region'] = $variables['elements']['#region'];
+$variables['classes_array'][] = drupal_region_class($variables['region']);
+$variables['theme_hook_suggestions'][] = 'region__' . $variables['region'];
+}
+/**
+* Preprocesses variables for theme_username().
+*
+* Modules that make any changes to variables like 'name' or 'extra' must insure
+* that the final string is safe to include directly in the output by using
+* check_plain() or filter_xss().
+*
+* @see template_process_username()
+*/
+function template_preprocess_username(&$variables) {
+$account = $variables['account'];
+$variables['extra'] = '';
+if (empty($account->uid)) {
+$variables['uid'] = 0;
+if (theme_get_setting('toggle_comment_user_verification')) {
+$variables['extra'] = ' (' . t('not verified') . ')';
+}
+}
+else {
+$variables['uid'] = (int) $account->uid;
+}
+// Set the name to a formatted name that is safe for printing and
+// that won't break tables by being too long. Keep an unshortened,
+// unsanitized version, in case other preprocess functions want to implement
+// their own shortening logic or add markup. If they do so, they must ensure
+// that $variables['name'] is safe for printing.
+$name = $variables['name_raw'] = format_username($account);
+if (drupal_strlen($name) > 20) {
+$name = drupal_substr($name, 0, 15) . '...';
+}
+$variables['name'] = check_plain($name);
+$variables['profile_access'] = user_access('access user profiles');
+$variables['link_attributes'] = array();
+// Populate link path and attributes if appropriate.
+if ($variables['uid'] && $variables['profile_access']) {
+// We are linking to a local user.
+$variables['link_attributes'] = array('title' => t('View user profile.'));
+$variables['link_path'] = 'user/' . $variables['uid'];
+}
+elseif (!empty($account->homepage)) {
+// Like the 'class' attribute, the 'rel' attribute can hold a
+// space-separated set of values, so initialize it as an array to make it
+// easier for other preprocess functions to append to it.
+$variables['link_attributes'] = array('rel' => array('nofollow'));
+$variables['link_path'] = $account->homepage;
+$variables['homepage'] = $account->homepage;
+}
+// We do not want the l() function to check_plain() a second time.
+$variables['link_options']['html'] = TRUE;
+// Set a default class.
+$variables['attributes_array'] = array('class' => array('username'));
+}
+/**
+* Processes variables for theme_username().
+*
+* @see template_preprocess_username()
+*/
+function template_process_username(&$variables) {
+// Finalize the link_options array for passing to the l() function.
+// This is done in the process phase so that attributes may be added by
+// modules or the theme during the preprocess phase.
+if (isset($variables['link_path'])) {
+// $variables['attributes_array'] contains attributes that should be applied
+// regardless of whether a link is being rendered or not.
+// $variables['link_attributes'] contains attributes that should only be
+// applied if a link is being rendered. Preprocess functions are encouraged
+// to use the former unless they want to add attributes on the link only.
+// If a link is being rendered, these need to be merged. Some attributes are
+// themselves arrays, so the merging needs to be recursive.
+$variables['link_options']['attributes'] = array_merge_recursive($variables['link_attributes'], $variables['attributes_array']);
+}
+}