module.inc 13.5 KB
Newer Older
1
2
3
<?php
// $Id$

4
5
6
7
8
/**
 * @file
 * API for loading and interacting with Drupal modules.
 */

9
/**
10
 * Load all the modules that have been enabled in the system table.
11
 */
12
function module_load_all() {
13
14
15
  foreach (module_list(TRUE, FALSE) as $module) {
    drupal_load('module', $module);
  }
16
17
}

18
19
20
21
/**
 * Call a function repeatedly with each module in turn as an argument.
 */
function module_iterate($function, $argument = '') {
Kjartan's avatar
Kjartan committed
22
23
24
  foreach (module_list() as $name) {
    $function($name, $argument);
  }
25
26
}

27
/**
28
29
 * Collect a list of all loaded modules. During the bootstrap, return only
 * vital modules. See bootstrap.inc
30
31
32
33
34
 *
 * @param $refresh
 *   Whether to force the module list to be regenerated (such as after the
 *   administrator has changed the system settings).
 * @param $bootstrap
35
36
 *   Whether to return the reduced set of modules loaded in "bootstrap mode"
 *   for cached pages. See bootstrap.inc.
37
38
39
 * @param $sort
 *   By default, modules are ordered by weight and filename, settings this option
 *   to TRUE, module list will be ordered by module name.
40
41
42
 * @param $fixed_list
 *   (Optional) Override the module list with the given modules. Stays until the
 *   next call with $refresh = TRUE.
43
44
45
46
 * @return
 *   An associative array whose keys and values are the names of all loaded
 *   modules.
 */
47
function module_list($refresh = FALSE, $bootstrap = TRUE, $sort = FALSE, $fixed_list = NULL) {
48
  static $list, $sorted_list;
49

50
  if ($refresh || $fixed_list) {
51
    unset($sorted_list);
Dries's avatar
Dries committed
52
    $list = array();
53
54
55
56
57
    if ($fixed_list) {
      foreach ($fixed_list as $name => $module) {
        drupal_get_filename('module', $name, $module['filename']);
        $list[$name] = $name;
      }
58
59
    }
    else {
60
      if ($bootstrap) {
61
        $result = db_query("SELECT name, filename, throttle FROM {system} WHERE type = 'module' AND status = 1 AND bootstrap = 1 ORDER BY weight ASC, filename ASC");
62
63
      }
      else {
64
        $result = db_query("SELECT name, filename, throttle FROM {system} WHERE type = 'module' AND status = 1 ORDER BY weight ASC, filename ASC");
65
66
67
68
69
70
71
72
73
74
75
      }
      while ($module = db_fetch_object($result)) {
        if (file_exists($module->filename)) {
          // 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) > 0);
          if (!$throttle) {
            drupal_get_filename('module', $module->name, $module->filename);
            $list[$module->name] = $module->name;
          }
Dries's avatar
   
Dries committed
76
        }
77
      }
78
79
    }
  }
80
81
82
83
84
85
86
  if ($sort) {
    if (!isset($sorted_list)) {
      $sorted_list = $list;
      ksort($sorted_list);
    }
    return $sorted_list;
  }
87
88
89
  return $list;
}

Steven Wittens's avatar
Steven Wittens committed
90
91
/**
 * Rebuild the database cache of module files.
92
 *
Steven Wittens's avatar
Steven Wittens committed
93
94
95
96
97
 * @return
 *   The array of filesystem objects used to rebuild the cache.
 */
function module_rebuild_cache() {
  // Get current list of modules
98
  $files = drupal_system_listing('\.module$', 'modules', 'name', 0);
Steven Wittens's avatar
Steven Wittens committed
99
100
101
102
103
104

  // Extract current files from database.
  system_get_files_database($files, 'module');

  ksort($files);

105
106
107
108
109
  // Set defaults for module info
  $defaults = array(
    'dependencies' => array(),
    'dependents' => array(),
    'description' => '',
110
111
    'version' => NULL,
    'php' => DRUPAL_MINIMUM_PHP,
112
113
  );

Steven Wittens's avatar
Steven Wittens committed
114
  foreach ($files as $filename => $file) {
115
116
117
    // Look for the info file.
    $file->info = drupal_parse_info_file(dirname($file->filename) .'/'. $file->name .'.info');

118
119
120
121
122
    // Skip modules that don't provide info.
    if (empty($file->info)) {
      unset($files[$filename]);
      continue;
    }
123
124
    // Merge in defaults and save.
    $files[$filename]->info = $file->info + $defaults;
Steven Wittens's avatar
Steven Wittens committed
125

126
127
128
129
    // Invoke hook_system_info_alter() to give installed modules a chance to
    // modify the data in the .info files if necessary.
    drupal_alter('system_info', $files[$filename]->info, $files[$filename]);

130
    // Log the critical hooks implemented by this module.
Steven Wittens's avatar
Steven Wittens committed
131
132
133
134
135
136
137
138
139
140
    $bootstrap = 0;
    foreach (bootstrap_hooks() as $hook) {
      if (module_hook($file->name, $hook)) {
        $bootstrap = 1;
        break;
      }
    }

    // Update the contents of the system table:
    if (isset($file->status) || (isset($file->old_filename) && $file->old_filename != $file->filename)) {
141
      db_query("UPDATE {system} SET info = '%s', name = '%s', filename = '%s', bootstrap = %d WHERE filename = '%s'", serialize($files[$filename]->info), $file->name, $file->filename, $bootstrap, $file->old_filename);
Steven Wittens's avatar
Steven Wittens committed
142
143
144
    }
    else {
      // This is a new module.
145
146
      $files[$filename]->status = 0;
      $files[$filename]->throttle = 0;
147
      db_query("INSERT INTO {system} (name, info, type, filename, status, throttle, bootstrap) VALUES ('%s', '%s', '%s', '%s', %d, %d, %d)", $file->name, serialize($files[$filename]->info), 'module', $file->filename, 0, 0, $bootstrap);
Steven Wittens's avatar
Steven Wittens committed
148
149
    }
  }
150
151
152
  $files = _module_build_dependents($files);
  return $files;
}
Steven Wittens's avatar
Steven Wittens committed
153

154
155
156
157
158
159
160
161
162
/**
 * Find dependents; modules that are required by other modules.
 * Adds an array of dependents to the $file->info array.
 *
 * @return
 *   The list of files array with dependents added where applicable.
 */
function _module_build_dependents($files) {
  foreach ($files as $filename => $file) {
163
    if (isset($file->info['dependencies']) && is_array($file->info['dependencies'])) {
164
165
166
167
168
169
170
171
172
173
      foreach ($file->info['dependencies'] as $dependency) {
        if (!empty($files[$dependency]) && is_array($files[$dependency]->info)) {
          if (!isset($files[$dependency]->info['dependents'])) {
            $files[$dependency]->info['dependents'] = array();
          }
          $files[$dependency]->info['dependents'][] = $filename;
        }
      }
    }
  }
Steven Wittens's avatar
Steven Wittens committed
174
175
176
  return $files;
}

177
178
179
180
181
182
183
184
/**
 * Determine whether a given module exists.
 *
 * @param $module
 *   The name of the module (without the .module extension).
 * @return
 *   TRUE if the module is both installed and enabled.
 */
185
function module_exists($module) {
186
  $list = module_list();
187
  return array_key_exists($module, $list);
188
189
}

Steven Wittens's avatar
Steven Wittens committed
190
191
192
193
194
195
196
/**
 * Load a module's installation hooks.
 */
function module_load_install($module) {
  // Make sure the installation API is available
  include_once './includes/install.inc';

197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
  module_load_include('install', $module);
}

/**
 * Load a module include file.
 *
 * @param $type
 *   The include file's type (file extension).
 * @param $module
 *   The module to which the include file belongs.
 * @param $name
 *   Optionally, specify the file name. If not set, the module's name is used.
 */
function module_load_include($type, $module, $name = NULL) {
  if (empty($name)) {
    $name = $module;
  }

  $file = './'. drupal_get_path('module', $module) ."/$name.$type";

  if (is_file($file)) {
    require_once $file;
  }
  else {
    return FALSE;
  }
}

/**
 * Load an include file for each of the modules that have been enabled in
 * the system table.
 */
function module_load_all_includes($type, $name = NULL) {
  $modules = module_list();
  foreach ($modules as $module) {
    module_load_include($type, $module, $name);
Steven Wittens's avatar
Steven Wittens committed
233
234
235
236
  }
}

/**
237
 * Enable a given list of modules.
Steven Wittens's avatar
Steven Wittens committed
238
 *
239
240
 * @param $module_list
 *   An array of module names.
Steven Wittens's avatar
Steven Wittens committed
241
 */
242
243
244
function module_enable($module_list) {
  $invoke_modules = array();
  foreach ($module_list as $module) {
245
    $existing = db_fetch_object(db_query("SELECT status FROM {system} WHERE type = '%s' AND name = '%s'", 'module', $module));
246
    if ($existing->status == 0) {
247
      module_load_install($module);
248
      db_query("UPDATE {system} SET status = %d, throttle = %d WHERE type = '%s' AND name = '%s'", 1, 0, 'module', $module);
249
250
251
      drupal_load('module', $module);
      $invoke_modules[] = $module;
    }
Steven Wittens's avatar
Steven Wittens committed
252
  }
253
254
255
256
257
258
259
260
261
262

  if (!empty($invoke_modules)) {
    // Refresh the module list to include the new enabled module.
    module_list(TRUE, FALSE);
    // Force to regenerate the stored list of hook implementations.
    module_implements('', FALSE, TRUE);
  }

  foreach ($invoke_modules as $module) {
    module_invoke($module, 'enable');
263
264
265
266
    // Check if node_access table needs rebuilding.
    if (!node_access_needs_rebuild() && module_hook($module, 'node_grants')) {
      node_access_needs_rebuild(TRUE);
    }
Steven Wittens's avatar
Steven Wittens committed
267
268
269
270
  }
}

/**
271
 * Disable a given set of modules.
Steven Wittens's avatar
Steven Wittens committed
272
 *
273
274
 * @param $module_list
 *   An array of module names.
Steven Wittens's avatar
Steven Wittens committed
275
 */
276
277
278
279
function module_disable($module_list) {
  $invoke_modules = array();
  foreach ($module_list as $module) {
    if (module_exists($module)) {
280
281
282
283
284
      // Check if node_access table needs rebuilding.
      if (!node_access_needs_rebuild() && module_hook($module, 'node_grants')) {
        node_access_needs_rebuild(TRUE);
      }

285
286
      module_load_install($module);
      module_invoke($module, 'disable');
287
      db_query("UPDATE {system} SET status = %d, throttle = %d WHERE type = '%s' AND name = '%s'", 0, 0, 'module', $module);
288
289
      $invoke_modules[] = $module;
    }
Steven Wittens's avatar
Steven Wittens committed
290
  }
291
292
293
294
295
296

  if (!empty($invoke_modules)) {
    // Refresh the module list to exclude the disabled modules.
    module_list(TRUE, FALSE);
    // Force to regenerate the stored list of hook implementations.
    module_implements('', FALSE, TRUE);
Steven Wittens's avatar
Steven Wittens committed
297
  }
298

299
  // If there remains no more node_access module, rebuilding will be
300
301
302
303
  // straightforward, we can do it right now.
  if (node_access_needs_rebuild() && count(module_implements('node_grants')) == 0) {
    node_access_rebuild();
  }
Steven Wittens's avatar
Steven Wittens committed
304
305
}

306
307
/**
 * @defgroup hooks Hooks
Dries's avatar
   
Dries committed
308
309
 * @{
 * Allow modules to interact with the Drupal core.
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
 *
 * 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);
340
341
}

Dries's avatar
   
Dries committed
342
343
344
345
346
/**
 * Determine which modules are implementing a hook.
 *
 * @param $hook
 *   The name of the hook (e.g. "help" or "menu").
347
348
349
 * @param $sort
 *   By default, modules are ordered by weight and filename, settings this option
 *   to TRUE, module list will be ordered by module name.
350
351
352
353
 * @param $refresh
 *   For internal use only: Whether to force the stored list of hook
 *   implementations to be regenerated (such as after enabling a new module,
 *   before processing hook_enable).
Dries's avatar
   
Dries committed
354
355
356
 * @return
 *   An array with the names of the modules which are implementing this hook.
 */
357
function module_implements($hook, $sort = FALSE, $refresh = FALSE) {
Dries's avatar
   
Dries committed
358
359
  static $implementations;

360
  if ($refresh) {
361
    $implementations = array();
362
363
364
    return;
  }

Dries's avatar
   
Dries committed
365
366
  if (!isset($implementations[$hook])) {
    $implementations[$hook] = array();
367
    $list = module_list(FALSE, TRUE, $sort);
Dries's avatar
   
Dries committed
368
369
370
371
372
373
374
    foreach ($list as $module) {
      if (module_hook($module, $hook)) {
        $implementations[$hook][] = $module;
      }
    }
  }

375
  // The explicit cast forces a copy to be made. This is needed because
376
377
378
379
380
381
  // $implementations[$hook] is only a reference to an element of
  // $implementations and if there are nested foreaches (due to nested node
  // API calls, for example), they would both manipulate the same array's
  // references, which causes some modules' hooks not to be called.
  // See also http://www.zend.com/zend/art/ref-count.php.
  return (array)$implementations[$hook];
Dries's avatar
   
Dries committed
382
383
}

384
385
386
387
388
389
390
391
392
393
394
395
/**
 * 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.
 */
396
397
function module_invoke() {
  $args = func_get_args();
398
399
400
  $module = $args[0];
  $hook = $args[1];
  unset($args[0], $args[1]);
401
  $function = $module .'_'. $hook;
402
403
  if (module_hook($module, $hook)) {
    return call_user_func_array($function, $args);
404
405
406
407
408
409
410
411
412
413
414
415
416
  }
}
/**
 * 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.
 */
417
418
function module_invoke_all() {
  $args = func_get_args();
419
420
  $hook = $args[0];
  unset($args[0]);
421
  $return = array();
422
423
424
  foreach (module_implements($hook) as $module) {
    $function = $module .'_'. $hook;
    $result = call_user_func_array($function, $args);
425
    if (isset($result) && is_array($result)) {
426
427
      $return = array_merge($return, $result);
    }
428
429
430
    else if (isset($result)) {
      $return[] = $result;
    }
431
432
433
434
435
436
  }

  return $return;
}

/**
Dries's avatar
   
Dries committed
437
 * @} End of "defgroup hooks".
438
439
 */

440
441
442
443
/**
 * Array of modules required by core.
 */
function drupal_required_modules() {
444
  return array('block', 'filter', 'node', 'system', 'user');
445
}