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: ?>