mod/glossary/filter.php

   1 <?php // $Id$
   2
   3 function glossary_filter($courseid, $text) {
   4     global $CFG;
   5
   6     // Trivial-cache - keyed on $cachedcourseid
   7     static $nothingtodo;
   8     static $conceptlist;
   9     static $cachedcourseid;
  10
  11     if (empty($courseid)) {
  12         $courseid = SITEID;
  13     }
  14
  15     // Initialise/invalidate our trivial cache if dealing with a different course
  16     if (!isset($cachedcourseid) || $cachedcourseid !== (int)$courseid) {
  17         $conceptlist = array();
  18         $nothingtodo = false;
  19     }
  20     $cachedcourseid = (int)$courseid;
  21
  22     if ($nothingtodo === true) {
  23         return $text;
  24     }
  25
  26 /// Create a list of all the concepts to search for.  It may be cached already.
  27
  28     if (empty($conceptlist)) {
  29
  30     /// Find all the glossaries we need to examine
  31         if (!$glossaries = get_records_sql_menu ('SELECT g.id, g.name
  32                                                     FROM '.$CFG->prefix.'glossary g,
  33                                                          '.$CFG->prefix.'course_modules cm,
  34                                                          '.$CFG->prefix.'modules m
  35                                                     WHERE m.name = \'glossary\' AND
  36                                                           cm.module = m.id AND
  37                                                           cm.visible = 1 AND
  38                                                           g.id = cm.instance AND
  39                                                           g.usedynalink != 0 AND
  40                                                           (g.course = \''.$courseid.'\' OR g.globalglossary = 1)
  41                                                     ORDER BY g.globalglossary, g.id')) {
  42             $nothingtodo = true;
  43             return $text;
  44         }
  45
  46     /// Make a list of glossary IDs for searching
  47         $glossarylist = '';
  48         foreach ($glossaries as $glossaryid => $glossaryname) {
  49             $glossarylist .= $glossaryid.',';
  50         }
  51         $glossarylist = substr($glossarylist,0,-1);
  52
  53
  54     /// Pull out all the raw data from the database for entries, categories and aliases
  55         $entries = get_records_select('glossary_entries',
  56                                       'glossaryid IN ('.$glossarylist.') AND usedynalink != 0 AND approved != 0 ', '',
  57                                       'id,glossaryid, concept, casesensitive, 0 AS category, fullmatch');
  58
  59         $categories = get_records_select('glossary_categories',
  60                                          'glossaryid IN ('.$glossarylist.') AND usedynalink != 0', '',
  61                                          'id,glossaryid,name AS concept, 1 AS casesensitive, 1 AS category, 1 AS fullmatch');
  62
  63         $aliases = get_records_sql('SELECT ga.id, ge.glossaryid, ga.alias as concept, ge.concept as originalconcept,
  64                                            casesensitive, 0 AS category, fullmatch
  65                                       FROM '.$CFG->prefix.'glossary_alias ga,
  66                                            '.$CFG->prefix.'glossary_entries ge
  67                                      WHERE ga.entryid = ge.id
  68                                        AND ge.glossaryid IN ('.$glossarylist.')
  69                                        AND ge.usedynalink != 0
  70                                        AND ge.approved != 0');
  71
  72
  73     /// Combine them into one big list
  74         $concepts = array();
  75         if ($entries and $categories) {
  76             $concepts = array_merge($entries, $categories);
  77         } else if ($categories) {
  78             $concepts = $categories;
  79         } else if ($entries) {
  80             $concepts = $entries;
  81         }
  82
  83         if ($aliases) {
  84             $concepts = array_merge($concepts, $aliases);
  85         }
  86
  87         if (!empty($concepts)) {
  88             foreach ($concepts as $key => $concept) {
  89             /// Trim empty or unlinkable concepts
  90                 $currentconcept = trim(strip_tags($concept->concept));
  91                 if (empty($currentconcept)) {
  92                     unset($concepts[$key]);
  93                     continue;
  94                 } else {
  95                     $concepts[$key]->concept = $currentconcept;
  96                 }
  97
  98             /// Rule out any small integers.  See bug 1446
  99                 $currentint = intval($currentconcept);
 100                 if ($currentint && (strval($currentint) == $currentconcept) && $currentint < 1000) {
 101                     unset($concepts[$key]);
 102                 }
 103             }
 104         }
 105
 106         if (empty($concepts)) {
 107             $nothingtodo = true;
 108             return $text;
 109         }
 110
 111         usort($concepts, 'glossary_sort_entries_by_length');
 112
 113         $strcategory = get_string('category', 'glossary');
 114
 115
 116     /// Loop through all the concepts, setting up our data structure for the filter
 117
 118         $conceptlist = array();    /// We will store all the concepts here
 119
 120         foreach ($concepts as $concept) {
 121
 122             $glossaryname = $glossaries[$concept->glossaryid];
 123
 124             if ($concept->category) {       // Link to a category
 125                 $title = strip_tags($glossaryname.': '.$strcategory.' '.$concept->concept);
 126                 $href_tag_begin = '<a class="glossary autolink glossaryid'.$concept->glossaryid.'" title="'.$title.'" '.
 127                                   'href="'.$CFG->wwwroot.'/mod/glossary/view.php?g='.$concept->glossaryid.
 128                                   '&amp;mode=cat&amp;hook='.$concept->id.'">';
 129             } else {
 130                 if (!empty($concept->originalconcept)) {  // We are dealing with an alias (so show original)
 131                     $encodedconcept = urlencode($concept->originalconcept);
 132                     $title = str_replace('"', "'", strip_tags($glossaryname.': '.$concept->originalconcept));
 133                 } else {
 134                     $encodedconcept = urlencode($concept->concept);
 135                     $title = str_replace('"', "'", strip_tags($glossaryname.': '.$concept->concept));
 136                 }
 137                 $href_tag_begin = '<a class="glossary autolink glossaryid'.$concept->glossaryid.'" title="'.$title.'" '.
 138                                   'href="'.$CFG->wwwroot.'/mod/glossary/showentry.php?courseid='.$courseid.
 139                                   '&amp;concept='.$encodedconcept.'" '.
 140                                   'onclick="return openpopup(\'/mod/glossary/showentry.php?courseid='.$courseid.
 141                                   '\&amp;concept='.$encodedconcept.'\', \'entry\', '.
 142                                   '\'menubar=0,location=0,scrollbars,resizable,width=600,height=450\', 0);">';
 143             }
 144
 145
 146             $conceptlist[] = new filterobject($concept->concept, $href_tag_begin, '</a>',
 147                                               $concept->casesensitive, $concept->fullmatch);
 148         }
 149
 150         $conceptlist = filter_remove_duplicates($conceptlist);
 151     }
 152
 153     return filter_phrases($text, $conceptlist);   // Actually search for concepts!
 154 }
 155
 156
 157 function glossary_sort_entries_by_length ($entry0, $entry1) {
 158     $len0 = strlen($entry0->concept);
 159     $len1 = strlen($entry1->concept);
 160
 161     if ($len0 < $len1) {
 162         return 1;
 163     } else if ($len0 > $len1) {
 164         return -1;
 165     } else {
 166         return 0;
 167     }
 168 }
 169
 170
 171 ?>