mod/resource/filter.php

   1 <?php // $Id$
   2     //This function provides automatic linking to
   3     //resources when its name (title) is found inside every Moodle text
   4     //Williams, Stronk7, Martin D
   5
   6     function resource_filter($courseid, $text) {
   7
   8         global $CFG;
   9
  10         // Trivial-cache - keyed on $cachedcourseid
  11         static $nothingtodo;
  12         static $resourcelist;
  13         static $cachedcourseid;
  14
  15         // if we don't have a courseid, we can't run the query, so
  16         if (empty($courseid)) {
  17             return $text;
  18         }
  19
  20         // Initialise/invalidate our trivial cache if dealing with a different course
  21         if (!isset($cachedcourseid) || $cachedcourseid !== (int)$courseid) {
  22             $resourcelist = array();
  23             $nothingtodo = false;
  24         }
  25         $cachedcourseid = (int)$courseid;
  26
  27         if ($nothingtodo === true) {
  28             return $text;
  29         }
  30
  31     /// Create a list of all the resources to search for.  It may be cached already.
  32
  33         if (empty($resourcelist)) {
  34
  35         /// The resources are sorted from long to short so longer ones can be linked first.
  36
  37             if (!$resources = get_records('resource', 'course', $courseid, 'CHAR_LENGTH(name) DESC', 'id,name')) {
  38                 $nothingtodo = true;
  39                 return $text;
  40             }
  41
  42             $resourcelist = array();
  43
  44             foreach ($resources as $resource) {
  45                 $currentname = trim($resource->name);
  46                 $strippedname = strip_tags($currentname);
  47                 /// Avoid empty or unlinkable resource names
  48                 if (!empty($strippedname)) {
  49                     $resourcelist[] = new filterobject($currentname,
  50                             '<a class="resource autolink" title="'.$strippedname.'" href="'.
  51                              $CFG->wwwroot.'/mod/resource/view.php?r='.$resource->id.'" '.$CFG->frametarget.'>',
  52                              '</a>', false, true);
  53                 }
  54             }
  55
  56         }
  57         return  filter_phrases($text, $resourcelist);  // Look for all these links in the text
  58     }
  59
  60 ?>