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// $Id$
* 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.
*/
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/**
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* @name 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.
*/
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define('MARK_UPDATED', 2);
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/**
* @} End of "Content markers".
*/
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/**
* Determines if a theme is available to use.
*
* @param $theme
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* Either the name of a theme or a full theme object.
*
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* @return
* Boolean TRUE if the theme is enabled or is the site administration theme;
* FALSE otherwise.
*/
function drupal_theme_access($theme) {
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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) {
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$admin_theme = variable_get('admin_theme');
return !empty($theme->status) || ($admin_theme && $theme->name == $admin_theme);
}
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function drupal_theme_initialize() {
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global $theme, $user, $theme_key;
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// If $theme is already set, assume the others are set, too, and do nothing
if (isset($theme)) {
return;
}
drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
// Only select the user selected theme if it is available in the
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// list of themes that can be accessed.
$theme = !empty($user->theme) && drupal_theme_access($user->theme) ? $user->theme : variable_get('theme_default', 'bartik');
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// Allow modules to override the theme. Validation has already been performed
// inside menu_get_custom_theme(), so we do not need to check it again here.
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$custom_theme = menu_get_custom_theme();
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$theme = !empty($custom_theme) ? $custom_theme : $theme;
// Store the identifier for retrieving theme settings with.
$theme_key = $theme;
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// Find all our ancestor themes and put them in an array.
$base_theme = array();
$ancestor = $theme;
while ($ancestor && isset($themes[$ancestor]->base_theme)) {
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$ancestor = $themes[$ancestor]->base_theme;
$base_theme[] = $themes[$ancestor];
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}
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_drupal_theme_initialize($themes[$theme], array_reverse($base_theme));
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// Themes can have alter functions, so reset the drupal_alter() cache.
drupal_static_reset('drupal_alter');
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}
/**
* Initialize 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 $registry_callback
* The callback to invoke to set the theme registry.
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*/
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function _drupal_theme_initialize($theme, $base_theme = array(), $registry_callback = '_theme_load_registry') {
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global $theme_info, $base_theme_info, $theme_engine, $theme_path;
$theme_info = $theme;
$base_theme_info = $base_theme;
$theme_path = dirname($theme->filename);
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// 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] = $stylesheet;
}
}
}
}
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// Add stylesheets used by this theme.
if (!empty($theme->stylesheets)) {
foreach ($theme->stylesheets as $media => $stylesheets) {
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foreach ($stylesheets as $name => $stylesheet) {
$final_stylesheets[$media][$name] = $stylesheet;
}
}
}
// And now add the stylesheets properly
foreach ($final_stylesheets as $media => $stylesheets) {
foreach ($stylesheets as $stylesheet) {
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drupal_add_css($stylesheet, array('weight' => CSS_THEME, 'media' => $media, 'preprocess' => TRUE));
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}
}
// 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] = $script;
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}
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// Add scripts used by this theme.
if (!empty($theme->scripts)) {
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foreach ($theme->scripts as $name => $script) {
$final_scripts[$name] = $script;
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}
}
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// Add scripts used by this theme.
foreach ($final_scripts as $script) {
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drupal_add_js($script, array('weight' => JS_THEME, 'preprocess' => TRUE));
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}
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$theme_engine = NULL;
// Initialize the theme.
if (isset($theme->engine)) {
// Include the engine.
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include_once DRUPAL_ROOT . '/' . $theme->owner;
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$theme_engine = $theme->engine;
if (function_exists($theme_engine . '_init')) {
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foreach ($base_theme as $base) {
call_user_func($theme_engine . '_init', $base);
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}
call_user_func($theme_engine . '_init', $theme);
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}
}
else {
// include non-engine theme files
foreach ($base_theme as $base) {
// Include the theme file or the engine.
if (!empty($base->owner)) {
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include_once DRUPAL_ROOT . '/' . $base->owner;
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}
}
// and our theme gets one too.
if (!empty($theme->owner)) {
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include_once DRUPAL_ROOT . '/' . $theme->owner;
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if (isset($registry_callback)) {
_theme_registry_callback($registry_callback, array($theme, $base_theme, $theme_engine));
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}
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/**
* Get the theme registry.
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*
* @return
* The theme registry array if it has been stored in memory, NULL otherwise.
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*/
function theme_get_registry() {
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static $theme_registry = NULL;
if (!isset($theme_registry)) {
list($callback, $arguments) = _theme_registry_callback();
$theme_registry = call_user_func_array($callback, $arguments);
}
return $theme_registry;
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}
/**
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* Set the callback that will be used by theme_get_registry() to fetch the registry.
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*
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* @param $callback
* The name of the callback function.
* @param $arguments
* The arguments to pass to the function.
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*/
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function _theme_registry_callback($callback = NULL, array $arguments = array()) {
static $stored;
if (isset($callback)) {
$stored = array($callback, $arguments);
}
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return $stored;
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}
/**
* Get the theme_registry cache from the database; if it doesn't exist, build it.
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*
* @param $theme
* The loaded $theme object as returned by list_themes().
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* @param $base_theme
* An array of loaded $theme objects representing the ancestor themes in
* oldest first order.
* @param theme_engine
* The name of the theme engine.
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*/
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function _theme_load_registry($theme, $base_theme = NULL, $theme_engine = NULL) {
// Check the theme registry cache; if it exists, use it.
$cache = cache_get("theme_registry:$theme->name", 'cache');
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if (isset($cache->data)) {
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$registry = $cache->data;
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}
else {
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// If not, build one and cache it.
$registry = _theme_build_registry($theme, $base_theme, $theme_engine);
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// Only persist this registry if all modules are loaded. This assures a
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// complete set of theme hooks.
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if (module_load_all(NULL)) {
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_theme_save_registry($theme, $registry);
}
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}
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return $registry;
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}
/**
* Write the theme_registry cache into the database.
*/
function _theme_save_registry($theme, $registry) {
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cache_set("theme_registry:$theme->name", $registry);
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}
/**
* Force the system to rebuild the theme registry; this 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() {
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cache_clear_all('theme_registry', 'cache', TRUE);
}
/**
* Process a single implementation of hook_theme().
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*
* @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.
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* - '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 $name is. For example, modules/system or
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* themes/bartik.
*
* @see theme()
* @see _theme_process_registry()
* @see hook_theme()
* @see list_themes()
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*/
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function _theme_process_registry(&$cache, $name, $type, $theme, $path) {
$result = array();
$function = $name . '_theme';
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// Processor functions work in two distinct phases with the process
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// functions always being executed after the preprocess functions.
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$variable_process_phases = array(
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'preprocess functions' => 'preprocess',
'process functions' => 'process',
);
if (function_exists($function)) {
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$result = $function($cache, $type, $theme, $path);
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foreach ($result as $hook => $info) {
$result[$hook]['type'] = $type;
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$result[$hook]['theme path'] = $path;
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// if function and file are left out, default to standard naming
// conventions.
if (!isset($info['template']) && !isset($info['function'])) {
$result[$hook]['function'] = ($type == 'module' ? 'theme_' : $name . '_') . $hook;
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}
// If a path is set in the info, use what was set. Otherwise use the
// default path. This is mostly so system.module can declare theme
// functions on behalf of core .include files.
// All files are included to be safe. Conditionally included
// files can prevent them from getting registered.
if (isset($cache[$hook]['includes'])) {
$result[$hook]['includes'] = $cache[$hook]['includes'];
}
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;
}
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// If these keys are left unspecified within overridden entries returned
// by hook_theme(), carry them forward from the prior entry. This is so
// that themes don't need to specify this information, since the module
// that registered the theme hook already has.
foreach (array('variables', 'render element', 'pattern', 'base hook') as $key) {
if (!array_key_exists($key, $info) && isset($cache[$hook][$key])) {
$result[$hook][$key] = $cache[$hook][$key];
}
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}
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// The following apply only to theming hooks implemented as templates.
if (isset($info['template'])) {
// Prepend the current theming path when none is set.
if (!isset($info['path'])) {
$result[$hook]['template'] = $path . '/' . $info['template'];
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}
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}
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// Allow variable processors for all theming hooks, whether the hook is
// implemented as a template or as a function.
foreach ($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;
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}
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else {
// This applies when the theme manually registers their own variable
// processors.
$prefixes[] = $name;
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}
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foreach ($prefixes as $prefix) {
// Only use non-hook-specific variable processors for theming hooks
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// implemented as templates. See theme().
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if (isset($info['template']) && function_exists($prefix . '_' . $phase)) {
$info[$phase_key][] = $prefix . '_' . $phase;
}
if (function_exists($prefix . '_' . $phase . '_' . $hook)) {
$info[$phase_key][] = $prefix . '_' . $phase . '_' . $hook;
}
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}
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}
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// Check for the override flag and prevent the cached variable
// processors from being used. This allows themes or theme engines to
// remove variable processors set earlier in the registry build.
if (!empty($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];
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}
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}
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// Merge the newly created theme hooks into the existing cache.
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$cache = array_merge($cache, $result);
}
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// Let themes have variable processors even if they didn't register a template.
if ($type == 'theme' || $type == 'base_theme') {
foreach ($cache as $hook => $info) {
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// Check only if not registered by the theme or engine.
if (empty($result[$hook])) {
foreach ($variable_process_phases as $phase_key => $phase) {
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if (!isset($info[$phase_key])) {
$cache[$hook][$phase_key] = array();
}
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// Only use non-hook-specific variable processors for theming hooks
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// implemented as templates. See theme().
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if (isset($info['template']) && function_exists($name . '_' . $phase)) {
$cache[$hook][$phase_key][] = $name . '_' . $phase;
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}
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if (function_exists($name . '_' . $phase . '_' . $hook)) {
$cache[$hook][$phase_key][] = $name . '_' . $phase . '_' . $hook;
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$cache[$hook]['theme path'] = $path;
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}
// Ensure uniqueness.
$cache[$hook][$phase_key] = array_unique($cache[$hook][$phase_key]);
}
}
}
}
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}
/**
* Rebuild the theme registry cache.
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*
* @param $theme
* The loaded $theme object as returned by list_themes().
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* @param $base_theme
* An array of loaded $theme objects representing the ancestor themes in
* oldest first order.
* @param theme_engine
* The name of the theme engine.
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*/
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function _theme_build_registry($theme, $base_theme, $theme_engine) {
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$cache = array();
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// First, process the theme hooks advertised by modules. This will
// serve as the basic registry.
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foreach (module_implements('theme') as $module) {
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_theme_process_registry($cache, $module, 'module', $module, drupal_get_path('module', $module));
}
// Process each base theme.
foreach ($base_theme as $base) {
// If the base theme uses a theme engine, process its hooks.
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$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, $base_path);
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}
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// And then the same thing, but for the theme.
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if ($theme_engine) {
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_theme_process_registry($cache, $theme_engine, 'theme_engine', $theme->name, dirname($theme->filename));
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}
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// Finally, hooks provided by the theme itself.
_theme_process_registry($cache, $theme->name, 'theme', $theme->name, dirname($theme->filename));
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// Let modules alter the registry.
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drupal_alter('theme_registry', $cache);
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// Optimize the registry to not have empty arrays for functions.
foreach ($cache as $hook => $info) {
foreach (array('preprocess functions', 'process functions') as $phase) {
if (empty($info[$phase])) {
unset($cache[$hook][$phase]);
}
}
}
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return $cache;
}
* Return a list of all currently available themes.
* Retrieved from the database, if available and the site is not in maintenance
* mode; otherwise compiled freshly from the filesystem.
*
* Whether to reload the list of themes from the database. Defaults to FALSE.
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*
* An associative array of the currently available themes. The keys are the
* names of the themes and the values are objects having the following
* properties:
* - 'filename': The name of the .info file.
* - 'name': The name of the theme.
* - 'status': 1 for enabled, 0 for disabled themes.
* - 'info': The contents of the .info file.
* - 'stylesheets': A two dimensional array, using the first key for the
* 'media' attribute (e.g. 'all'), the second for the name of the file
* (e.g. style.css). The value is a complete filepath
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* (e.g. themes/bartik/style.css).
* - 'scripts': An associative array of JavaScripts, using the filename as key
* and the complete filepath as value.
* - 'engine': The name of the theme engine.
* - 'base theme': The name of the base theme.
function list_themes($refresh = FALSE) {
$list = &drupal_static(__FUNCTION__, array());
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system_list_reset();
$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.
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if (!defined('MAINTENANCE_MODE')) {
try {
foreach (system_list('theme') as $theme) {
if (file_exists($theme->filename)) {
$themes[] = $theme;
}
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}
}
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catch (Exception $e) {
// If the database is not available, rebuild the theme data.
$themes = _system_rebuild_theme_data();
}
}
else {
// Scan the installation when the database should not be read.
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$themes = _system_rebuild_theme_data();
}
foreach ($themes as $theme) {
foreach ($theme->info['stylesheets'] as $media => $stylesheets) {
foreach ($stylesheets as $stylesheet => $path) {
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$theme->stylesheets[$media][$stylesheet] = $path;
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}
}
foreach ($theme->info['scripts'] as $script => $path) {
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$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;
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* Generates themed output.
*
* All requests for themed output must go through this function. It examines
* the request and routes it to the appropriate theme function or template, by
* checking the theme registry.
*
* The first argument to this function is the name of the theme hook. For
* instance, to theme a table, the theme hook name is 'table'. By default, this
* theme hook could be implemented by a function called 'theme_table' or a
* template file called 'table.tpl.php', but hook_theme() can override the
* default function or template name.
*
* 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, $hook): Creates a default set of variables
* for all theme hooks.
* - template_preprocess_HOOK(&$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, $hook): Allows the theme engine to
* set necessary variables for all theme hooks.
* - ENGINE_engine_preprocess_HOOK(&$variables): Allows the theme engine to set
* necessary variables for the particular theme hook.
* - THEME_preprocess(&$variables, $hook): Allows the theme to set necessary
* variables for all theme hooks.
* - THEME_preprocess_HOOK(&$variables): Allows the theme to set necessary
* variables specific to the particular theme hook.
* - template_process(&$variables, $hook): Creates a default set of variables
* for all theme hooks.
* - template_process_HOOK(&$variables): This is the first processor specific
* to the theme hook; it should be implemented by the module that registers
* it.
* - 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, $hook): Allows the theme engine to set
* necessary variables for all theme hooks.
* - ENGINE_engine_process_HOOK(&$variables): Allows the theme engine to set
* necessary variables for the particular theme hook.
* - ENGINE_process(&$variables, $hook): Allows the theme engine to process the
* variables.
* - ENGINE_process_HOOK(&$variables): Allows the theme engine to process the
* variables specific to the theme hook.
* - THEME_process(&$variables, $hook): Allows the theme to process the
* variables.
* - THEME_process_HOOK(&$variables): Allows the theme to process the
* variables specific to the theme hook.
*
* If the implementation is a function, only the theme-hook-specific preprocess
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* and process functions (the ones ending in _HOOK) are called from the
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* 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.
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*
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* There are two special variables that these preprocess and process functions
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* 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.
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*
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* @param $hook
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* 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
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* called, but there is no implementation of that theme hook, then the 'links'
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* 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
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* may also be an array, in which case the first theme hook that has an
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* implementation is used. This allows for the code that calls theme() to
* explicitly specify the fallback order in a situation where using the '__'
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* convention is not desired or is insufficient.
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* @param $variables
* An associative array of variables to merge with defaults from the theme
* registry, pass to preprocess and process functions for modification, and
* finally, pass to the function or template implementing the theme hook.
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* Alternatively, this can be a renderable array, in which case, its
* properties are mapped to variables expected by the theme hook
* implementations.
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*
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* An HTML string representing the themed output.
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function theme($hook, $variables = array()) {
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static $hooks = NULL;
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// If called before all modules are loaded, we do not necessarily have a full
// theme registry to work with, and therefore cannot process the theme
// request properly. See also _theme_load_registry().
if (!module_load_all(NULL) && !defined('MAINTENANCE_MODE')) {
throw new Exception(t('theme() may not be called until all modules are loaded.'));
}
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if (!isset($hooks)) {
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drupal_theme_initialize();
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$hooks = theme_get_registry();
}
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// If an array of hook candidates were passed, use the first one that has an
// implementation.
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if (is_array($hook)) {
foreach ($hook as $candidate) {
if (isset($hooks[$candidate])) {
break;
}
}
$hook = $candidate;
}
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// If there's no implementation, check for more generic fallbacks. If there's
// still no implementation, log an error and return an empty string.
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if (!isset($hooks[$hook])) {
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// Iteratively strip everything after the last '__' delimiter, until an
// implementation is found.
while ($pos = strrpos($hook, '__')) {
$hook = substr($hook, 0, $pos);
if (isset($hooks[$hook])) {
break;
}
}
if (!isset($hooks[$hook])) {
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// Only log a message when not trying theme suggestions ($hook being an
// array).
if (!isset($candidate)) {
watchdog('theme', 'Theme key "@key" not found.', array('@key' => $hook), WATCHDOG_WARNING);
}
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return '';
}
}
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$info = $hooks[$hook];
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global $theme_path;
$temp = $theme_path;
// point path_to_theme() to the currently used theme path:
$theme_path = $info['theme path'];
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// Include a file if the theme function or variable processor is held elsewhere.
if (!empty($info['includes'])) {
foreach ($info['includes'] as $include_file) {
include_once DRUPAL_ROOT . '/' . $include_file;
}
}
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// If a renderable array is passed as $variables, then set $variables to
// the arguments expected by the theme function.
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if (isset($variables['#theme']) || isset($variables['#theme_wrappers'])) {
$element = $variables;
$variables = array();
if (isset($info['variables'])) {
foreach (array_keys($info['variables']) as $name) {
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if (isset($element["#$name"])) {
$variables[$name] = $element["#$name"];
}
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}
}
else {
$variables[$info['render element']] = $element;
}
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}
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// Merge in argument defaults.
if (!empty($info['variables'])) {
$variables += $info['variables'];
}
elseif (!empty($info['render element'])) {
$variables += array($info['render element'] => array());
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}
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// Invoke the variable processors, if any. The processors may specify
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// 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];
if (isset($base_hook_info['preprocess functions']) || isset($base_hook_info['process functions'])) {
$variables['theme_hook_suggestion'] = $hook;
$hook = $base_hook;
$info = $base_hook_info;
}
}
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if (isset($info['preprocess functions']) || isset($info['process functions'])) {
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$variables['theme_hook_suggestions'] = array();
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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, $hook_clone);
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}
}
}
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}
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// If the preprocess/process functions specified hook suggestions, and the
// suggestion exists in the theme registry, use it instead of the hook that
// theme() was called with. This allows the preprocess/process step to
// route to a more specific theme hook. For example, a function may call
// theme('node', ...), but a preprocess function can add 'node__article' as
// a suggestion, enabling a theme to have an alternate template file for
// article nodes. Suggestions are checked in the following order:
// - The 'theme_hook_suggestion' variable is checked first. It overrides
// all others.
// - The 'theme_hook_suggestions' variable is checked in FILO order, so the
// last suggestion added to the array takes precedence over suggestions
// added earlier.
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$suggestions = array();
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if (!empty($variables['theme_hook_suggestions'])) {
$suggestions = $variables['theme_hook_suggestions'];
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}
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if (!empty($variables['theme_hook_suggestion'])) {
$suggestions[] = $variables['theme_hook_suggestion'];
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}
foreach (array_reverse($suggestions) as $suggestion) {
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if (isset($hooks[$suggestion])) {
$info = $hooks[$suggestion];
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break;
}
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}
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}
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// Generate the output using either a function or a template.
if (isset($info['function'])) {
if (function_exists($info['function'])) {
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$output = $info['function']($variables);
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else {
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// Default render function and extension.
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$render_function = 'theme_render_template';
$extension = '.tpl.php';
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// The theme engine may use a different extension and a different renderer.
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global $theme_engine;
if (isset($theme_engine)) {
if ($info['type'] != 'module') {
if (function_exists($theme_engine . '_render_template')) {
$render_function = $theme_engine . '_render_template';
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}
$extension_function = $theme_engine . '_extension';
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if (function_exists($extension_function)) {
$extension = $extension_function();
}
}
}
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// In some cases, a template implementation may not have had
// template_preprocess() run (for example, if the default implementation is
// a function, but a template overrides that default implementation). In
// these cases, a template should still be able to expect to have access to
// the variables provided by template_preprocess(), so we add them here if
// they don't already exist. We don't want to run template_preprocess()
// twice (it would be inefficient and mess up zebra striping), so we use the
// 'directory' variable to determine if it has already run, which while not
// completely intuitive, is reasonably safe, and allows us to save on the
// overhead of adding some new variable to track that.
if (!isset($variables['directory'])) {
$default_template_variables = array();
template_preprocess($default_template_variables, $hook);
$variables += $default_template_variables;
}
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// Render the output using the template file.
$template_file = $info['template'] . $extension;
if (isset($info['path'])) {
$template_file = $info['path'] . '/' . $template_file;
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}
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$output = $render_function($template_file, $variables);
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// restore path_to_theme()
$theme_path = $temp;
return $output;
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}
* Return 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.
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global $theme_path;
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if (!isset($theme_path)) {
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drupal_theme_initialize();
}
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return $theme_path;
}
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/**
* Allow themes and/or theme engines to easily discover overridden theme functions.
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*
* @param $cache
* The existing cache of theme hooks to test against.
* @param $prefixes
* An array of prefixes to test, in reverse order of importance.
*
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* @return $implementations
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* The functions found, suitable for returning from hook_theme;
*/
function drupal_find_theme_functions($cache, $prefixes) {
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$implementations = array();
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$functions = get_defined_functions();
foreach ($cache as $hook => $info) {
foreach ($prefixes as $prefix) {
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// Find theme functions that implement possible "suggestion" variants of
// registered theme hooks and add those as new registered theme hooks.
// The 'pattern' key defines a common prefix that all suggestions must
// start with. The default is the name of the hook followed by '__'. An
// 'base hook' key is added to each entry made for a found suggestion,
// so that common functionality can be implemented for all suggestions of
// the same base hook. To keep things simple, deep heirarchy of
// suggestions is not supported: each suggestion's 'base hook' key
// refers to a base hook, not to another suggestion, and all suggestions
// are found using the base hook's pattern, not a pattern from an
// intermediary suggestion.
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$pattern = isset($info['pattern']) ? $info['pattern'] : ($hook . '__');
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if (!isset($info['base hook']) && !empty($pattern)) {
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$matches = preg_grep('/^' . $prefix . '_' . $pattern . '/', $functions['user']);
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if ($matches) {
foreach ($matches as $match) {
$new_hook = str_replace($prefix . '_', '', $match);
$arg_name = isset($info['variables']) ? 'variables' : 'render element';
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$implementations[$new_hook] = array(
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'function' => $match,
$arg_name => $info[$arg_name],
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'base hook' => $hook,
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);
}
}
}
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// Find theme functions that implement registered theme hooks and include
// that in what is returned so that the registry knows that the theme has
// this implementation.
if (function_exists($prefix . '_' . $hook)) {
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$implementations[$hook] = array(
'function' => $prefix . '_' . $hook,
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);
}
}
}
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return $implementations;