01: <?php
02: 
03: defined ('VARIABLE') or die;
04: 
05: /*
06: ** Create a list of required hooks according to current one's dependencies
07: ** $id  : id of current hook in global $gl_hooks array
08: ** $chain : list of already required hooks to avoid circular references
09: ** $result : output array containing hooks to be included
10: */
11: function hookRequire ($id, $chain, &$result)
12: {
13:  global $gl_hooks;
14: 
15:  // Browse hooks required by current one
16:  $hook = &$gl_hooks[$id];
17: 
18:  foreach ($hook['ref'] as $ref => $needed)
19:  {
20:   // Check for circular references
21:   if (isset ($chain[$ref]))
22:    showError (tra ('error.internal_hook_circular', array ('source' => $id, 'target' => $ref)));
23: 
24:   // Check for required hook availability and dependencies
25:   if (isset ($gl_hooks[$ref]))
26:    hookRequire ($ref, $chain + array ($ref => 0), $result);
27:   else if ($needed)
28:    showError (tra ('error.internal_hook_needed', array ('source' => $id, 'target' => $ref)));
29:  }
30: 
31:  // Check if hook has already been registered
32:  foreach ($result as $i => $item)
33:  {
34:   if ($item['id'] == $id)
35:    return;
36:  }
37: 
38:  // Insert hook regarding its weights and already included dependencies
39:  if (is_file ($hook['path']))
40:  {
41:   $min = -1;
42: 
43:   foreach ($hook['ref'] as $ref => $null)
44:    foreach ($result as $i => $item)
45:     if ($item['id'] == $ref)
46:      $min = max ($min, $i);
47: 
48:   for ($index = count ($result); $index > $min + 1 && $result[$index - 1]['weight'] > $hook['weight']; )
49:    --$index;
50: 
51:   array_splice ($result, $index, 0, array (array
52:   (
53:    'access' => $hook['access'],
54:    'id'  => $id,
55:    'module' => $hook['module'],
56:    'path'  => $hook['path'],
57:    'weight' => $hook['weight']
58:   )));
59:  }
60:  else
61:   showError (tra ('error.internal_hook_file', array ('file' => $hook['file'], 'module' => tra ($hook['module'], array (), false))));
62: }
63: 
64: ?>