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author | Dries Buytaert <dries@buytaert.net> | 2004-07-14 20:42:20 +0000 |
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committer | Dries Buytaert <dries@buytaert.net> | 2004-07-14 20:42:20 +0000 |
commit | f63c3be30c90a34a03c4771609cb78a34ecef6bc (patch) | |
tree | 5bd2618c439d5924b7024b7fefa142fae66c9926 /includes | |
parent | 63a327db97c72b14c17609250f736b762668a533 (diff) | |
download | brdo-f63c3be30c90a34a03c4771609cb78a34ecef6bc.tar.gz brdo-f63c3be30c90a34a03c4771609cb78a34ecef6bc.tar.bz2 |
- Code and documentation improvements by JonBob.
Diffstat (limited to 'includes')
-rw-r--r-- | includes/module.inc | 174 |
1 files changed, 128 insertions, 46 deletions
diff --git a/includes/module.inc b/includes/module.inc index cad963e28..496aa01f6 100644 --- a/includes/module.inc +++ b/includes/module.inc @@ -1,48 +1,48 @@ <?php // $Id$ -// initialize modules: +/** + * Initialize all modules. + * + * To change the required set of modules, change this function as well as + * system_listing() and module_list(). + */ function module_init() { - // Note: changing this also requires changing system_listing() @ modules/system.module. - require_once "modules/admin.module"; - require_once "modules/filter.module"; - require_once "modules/system.module"; - require_once "modules/user.module"; - require_once "modules/watchdog.module"; + require_once 'modules/admin.module'; + require_once 'modules/filter.module'; + require_once 'modules/system.module'; + require_once 'modules/user.module'; + require_once 'modules/watchdog.module'; module_list(); - module_invoke_all("init"); + module_invoke_all('init'); } -// apply function $function to every known module: -function module_iterate($function, $argument = "") { +/** + * Call a function repeatedly with each module in turn as an argument. + */ +function module_iterate($function, $argument = '') { foreach (module_list() as $name) { $function($name, $argument); } } -// invoke hook $hook of module $name with optional arguments: -function module_invoke($name, $hook, $a1 = NULL, $a2 = NULL, $a3 = NULL, $a4 = NULL) { - $function = $name ."_". $hook; - if (function_exists($function)) { - return $function($a1, $a2, $a3, $a4); - } -} - -// invoke $hook for all appropriate modules: -function module_invoke_all($hook, $a1 = NULL, $a2 = NULL, $a3 = NULL, $a4 = NULL) { - $return = array(); - foreach (module_list() as $name) { - $result = module_invoke($name, $hook, $a1, $a2, $a3, $a4); - if (isset($result)) { - $return = array_merge($return, $result); - } - } - - return $return; -} - -// return array of module names (includes lazy module loading if not in bootstrap mode) -function module_list($refresh = 0, $bootstrap = 0) { +/** + * Collect a list of all installed and enabled modules. + * + * If any modules are enabled but have not yet been loaded, this function performs + * the include_once() to load them. + * + * @param $refresh + * Whether to force the module list to be regenerated (such as after the + * administrator has changed the system settings). + * @param $bootstrap + * Whether to return the reduced set of modules loaded in "bootstrap mode" for + * cached pages. See bootstrap.inc. + * @return + * An associative array whose keys and values are the names of all loaded + * modules. + */ +function module_list($refresh = FALSE, $bootstrap = FALSE) { static $list; if ($refresh) { @@ -50,7 +50,7 @@ function module_list($refresh = 0, $bootstrap = 0) { } if (!$list) { - $list = array("admin" => "admin", "filter" => "filter", "system" => "system", "user" => "user", "watchdog" => "watchdog"); + $list = array('admin' => 'admin', 'filter' => 'filter', 'system' => 'system', 'user' => 'user', 'watchdog' => 'watchdog'); if ($bootstrap) { $result = db_query("SELECT name, filename, throttle, bootstrap FROM {system} WHERE type = 'module' AND status = 1 AND bootstrap = 1"); } @@ -59,12 +59,10 @@ function module_list($refresh = 0, $bootstrap = 0) { } while ($module = db_fetch_object($result)) { if (file_exists($module->filename)) { - /* - ** Determine the current throttle status and see if module should be - ** loaded based on server load. We have to directly access the - ** throttle variables as the throttle.module may not be loaded yet. - */ - $throttle = ($module->throttle && variable_get("throttle_level", 0) > 4); + // Determine the current throttle status and see if the module should be + // loaded based on server load. We have to directly access the throttle + // variables, since throttle.module may not be loaded yet. + $throttle = ($module->throttle && variable_get('throttle_level', 0) > 4); if (!$throttle) { $list[$module->name] = $module->name; include_once $module->filename; @@ -76,15 +74,99 @@ function module_list($refresh = 0, $bootstrap = 0) { return $list; } -// return 1 if module $name exists, 0 otherwise: -function module_exist($name) { +/** + * Determine whether a given module exists. + * + * @param $module + * The name of the module (without the .module extension). + * @return + * TRUE if the module is both installed and enabled. + */ +function module_exist($module) { $list = module_list(); - return isset($list[$name]) ? 1 : 0; + return array_key_exists($module, $list); } -// return 1 if module $name implements hook $hook, 0 otherwise: -function module_hook($name, $hook) { - return function_exists($name ."_". $hook); +/** + * @defgroup hooks Hooks + * + * Drupal's module system is based on the concept of "hooks". A hook is a PHP + * function that is named foo_bar(), where "foo" is the name of the module (whose + * filename is thus foo.module) and "bar" is the name of the hook. Each hook has + * a defined set of parameters and a specified result type. + * + * To extend Drupal, a module need simply implement a hook. When Drupal wishes to + * allow intervention from modules, it determines which modules implement a hook + * and call that hook in all enabled modules that implement it. + * + * The available hooks to implement are explained here in the Hooks section of + * the developer documentation. The string "hook" is used as a placeholder for + * the module name is the hook definitions. For example, if the module file is + * called example.module, then hook_help() as implemented by that module would be + * defined as example_help(). + * + * @{ + */ + +/** + * Determine whether a module implements a hook. + * + * @param $module + * The name of the module (without the .module extension). + * @param $hook + * The name of the hook (e.g. "help" or "menu"). + * @return + * TRUE if the module is both installed and enabled, and the hook is + * implemented in that module. + */ +function module_hook($module, $hook) { + return function_exists($module .'_'. $hook); } +/** + * Invoke a hook in a particular module. + * + * @param $module + * The name of the module (without the .module extension). + * @param $hook + * The name of the hook to invoke. + * @param ... + * Arguments to pass to the hook implementation. + * @return + * The return value of the hook implementation. + */ +function module_invoke($module, $hook, $a1 = NULL, $a2 = NULL, $a3 = NULL, $a4 = NULL) { + $function = $module .'_'. $hook; + if (function_exists($function)) { + return $function($a1, $a2, $a3, $a4); + } +} + +/** + * Invoke a hook in all enabled modules that implement it. + * + * @param $hook + * The name of the hook to invoke. + * @param ... + * Arguments to pass to the hook. + * @return + * An array of return values of the hook implementations. If modules return + * arrays from their implementations, those are merged into one array. + */ +function module_invoke_all($hook, $a1 = NULL, $a2 = NULL, $a3 = NULL, $a4 = NULL) { + $return = array(); + foreach (module_list() as $module) { + $result = module_invoke($module, $hook, $a1, $a2, $a3, $a4); + if (isset($result)) { + $return = array_merge($return, $result); + } + } + + return $return; +} + +/** + * @} end of defgroup hooks + */ + ?> |