fixed undefined $sco
[moodle.git] / mod / scorm / datamodels / sequencinglib.php
1 <?php
2 require ($CFG->dirroot.'/mod/scorm/datamodels/scormlib.php');
4 function scorm_seq_evaluate($scoid,$usertracks) {
5     return true;
6 }
8 function scorm_seq_overall ($scoid,$userid,$request,$attempt) {
9     $seq = scorm_seq_navigation($scoid,$userid,$request,$attempt);
10     if ($seq->navigation) {
11         if ($seq->termination != null) {
12             $seq = scorm_seq_termination($scoid,$userid,$seq);
13         }
14         if ($seq->sequencing != null) {
15             $seq = scorm_seq_sequencing($scoid,$userid,$seq);
16             if($seq->sequencing == 'exit'){//return the control to the LTS
17                 return 'true';
18             }
19         }
20         if ($seq->delivery != null) {
21             $seq = scorm_sequencing_delivery($scoid,$userid,$seq);
22             $seq = scorm_content_delivery_environment ($seq,$userid);
23         }
24     }
25     if ($seq->exception != null) {
26         $seq = scorm_sequencing_exception($seq);
27     }
28     return 'true';
29 }
32 function scorm_seq_navigation ($scoid,$userid,$request,$attempt=0) {
33     global $DB;
35     /// Sequencing structure
36     $seq = new stdClass();
37     $seq->currentactivity = scorm_get_sco($scoid);
38     $seq->traversaldir = null;
39     $seq->nextactivity = null;
40     $seq->deliveryvalid = null;
41     $seq->attempt = $attempt;
43     $seq->identifiedactivity = null;
44     $seq->delivery = null;
45     $seq->deliverable = false;
46     $seq->active = scorm_seq_is('active',$scoid,$userid);
47     $seq->suspended = scorm_seq_is('suspended',$scoid,$userid);
48     $seq->navigation = null;
49     $seq->termination = null;
50     $seq->sequencing = null;
51     $seq->target = null;
52     $seq->endsession = null;
53     $seq->exception = null;
54     $seq->reachable = true;
55     $seq->prevact = true;
57     switch ($request) {
58         case 'start_':
59             if (empty($seq->currentactivity)) {
60                 $seq->navigation = true;
61                 $seq->sequencing = 'start';
62             } else {
63                 $seq->exception = 'NB.2.1-1'; /// Sequencing session already begun
64             }
65         break;
66         case 'resumeall_':
67             if (empty($seq->currentactivity)) {
68                 if ($track = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'suspendedactivity'))) {//I think it's suspend instead of suspendedactivity
69                     $seq->navigation = true;
70                     $seq->sequencing = 'resumeall';
71                 } else {
72                     $seq->exception = 'NB.2.1-3'; /// No suspended activity found
73                 }
74             } else {
75                 $seq->exception = 'NB.2.1-1'; /// Sequencing session already begun
76             }
77         break;
78         case 'continue_':
79         case 'previous_':
80             if (!empty($seq->currentactivity)) {
81                 $sco = $seq->currentactivity;
82                 if ($sco->parent != '/') {
83                     if ($parentsco = scorm_get_parent($sco)) {
85                          if (isset($parentsco->flow) && ($parentsco->flow == true)) {//I think it's parentsco
86                             // Current activity is active !
87                             if (scorm_seq_is('active',$sco->id,$userid)) {
88                                 if ($request == 'continue_') {
89                                     $seq->navigation = true;
90                                     $seq->termination = 'exit';
91                                     $seq->sequencing = 'continue';
92                                 } else {
93                                     if (!isset($parentsco->forwardonly) || ($parentsco->forwardonly == false)) {
94                                         $seq->navigation = true;
95                                         $seq->termination = 'exit';
96                                         $seq->sequencing = 'previous';
97                                     } else {
98                                         $seq->exception = 'NB.2.1-5'; /// Violates control mode
99                                     }
100                                 }
101                             }
102                         }
104                     }
105                 }
106             } else {
107                 $seq->exception = 'NB.2.1-2'; /// Current activity not defined
108             }
109         break;
110         case 'forward_':
111         case 'backward_':
112             $seq->exception = 'NB.2.1-7' ; /// None to be done, behavior not defined
113         break;
114         case 'exit_':
115         case 'abandon_':
116             if (!empty($seq->currentactivity)) {
117                 // Current activity is active !
118                 $seq->navigation = true;
119                 $seq->termination = substr($request,0,-1);
120                 $seq->sequencing = 'exit';
121             } else {
122                 $seq->exception = 'NB.2.1-2'; /// Current activity not defined
123             }
124         case 'exitall_':
125         case 'abandonall_':
126         case 'suspendall_':
127             if (!empty($seq->currentactivity)) {
128                 $seq->navigation = true;
129                 $seq->termination = substr($request,0,-1);
130                 $seq->sequencing = 'exit';
131             } else {
132                 $seq->exception = 'NB.2.1-2'; /// Current activity not defined
133             }
134         break;
135         default: /// {target=<STRING>}choice
136             if ($targetsco = $DB->get_record('scorm_scoes', array('scorm'=>$sco->scorm,'identifier'=>$request))) {
137                 if ($targetsco->parent != '/') {
138                     $seq->target = $request;
139                 } else {
140                     if ($parentsco = scorm_get_parent($targetsco)) {
141                         if (!isset($parentsco->choice) || ($parent->choice == true)) {
142                             $seq->target = $request;
143                         }
144                     }
145                 }
146                 if ($seq->target != null) {
147                     if (empty($seq->currentactivity)) {
148                         $seq->navigation = true;
149                         $seq->sequencing = 'choice';
150                     } else {
151                         if (!$sco = scorm_get_sco($scoid)) {
152                             return $seq;
153                         }
154                         if ($sco->parent != $target->parent) {
155                             $ancestors = scorm_get_ancestors($sco);
156                             $commonpos = scorm_find_common_ancestor($ancestors,$targetsco);
157                             if ($commonpos !== false) {
158                                 if ($activitypath = array_slice($ancestors,0,$commonpos)) {
159                                     foreach ($activitypath as $activity) {
160                                         if (scorm_seq_is('active',$activity->id,$userid) && (isset($activity->choiceexit) && ($activity->choiceexit == false))) {
161                                             $seq->navigation = false;
162                                             $seq->termination = null;
163                                             $seq->sequencing = null;
164                                             $seq->target = null;
165                                             $seq->exception = 'NB.2.1-8'; /// Violates control mode
166                                             return $seq;
167                                         }
168                                     }
169                                 } else {
170                                     $seq->navigation = false;
171                                     $seq->termination = null;
172                                     $seq->sequencing = null;
173                                     $seq->target = null;
174                                     $seq->exception = 'NB.2.1-9';
175                                 }
176                             }
177                         }
178                         // Current activity is active !
179                         $seq->navigation = true;
180                         $seq->sequencing = 'choice';
181                     }
182                 } else {
183                     $seq->exception = 'NB.2.1-10';  /// Violates control mode
184                 }
185             } else {
186                 $seq->exception = 'NB.2.1-11';  /// Target activity does not exists
187             }
188         break;
189     }
190     return $seq;
193 function scorm_seq_termination ($seq,$userid) {
194     if (empty($seq->currentactivity)) {
195         $seq->termination = false;
196         $seq->exception = 'TB.2.3-1';
197         return $seq;
198     }
200     $sco = $seq->currentactivity;
202     if ((($seq->termination == 'exit') || ($seq->termination == 'abandon')) && !$seq->active) {
203         $seq->termination = false;
204         $seq->exception = 'TB.2.3-2';
205         return $seq;
206     }
207     switch ($seq->termination) {
208         case 'exit':
209             scorm_seq_end_attempt($sco,$userid,$seq);
210             $seq = scorm_seq_exit_action_rules($seq,$userid);
211             do {
212                 $exit = false;// I think this is false. Originally this was true
213                 $seq = scorm_seq_post_cond_rules($seq,$userid);
214                 if ($seq->termination == 'exitparent') {
215                     if ($sco->parent != '/') {
216                         $sco = scorm_get_parent($sco);
217                         $seq->currentactivity = $sco;
218                         $seq->active = scorm_seq_is('active',$sco->id,$userid);
219                         scorm_seq_end_attempt($sco,$userid,$seq);
220                         $exit = true;//I think it's true. Originally this was false
221                     } else {
222                         $seq->termination = false;
223                         $seq->exception = 'TB.2.3-4';
224                         return $seq;
225                     }
226                 }
227             } while (($exit == false) && ($seq->termination == 'exit'));
228             if ($seq->termination == 'exit') {
229                 $seq->termination = true;
230                 return $seq;
231             }
232         case 'exitall':
233             if ($seq->active) {
234                 scorm_seq_end_attempt($sco,$userid,$seq);
235             }
236             /// Terminate Descendent Attempts Process
239             if ($ancestors = scorm_get_ancestors($sco)) {
240                 foreach ($ancestors as $ancestor) {
241                     scorm_seq_end_attempt($ancestor,$userid,$seq);
242                     $seq->currentactivity = $ancestor;
243                 }
244             }
246             $seq->active = scorm_seq_is('active',$seq->currentactivity->id,$userid);
247             $seq->termination = true;
248             $seq->sequencing = exit;
249         break;
250         case 'suspendall':
251             if (($seq->active) || ($seq->suspended)) {
252                 scorm_seq_set('suspended',$sco->id,$userid);
253             } else {
254                 if ($sco->parent != '/') {
255                     $parentsco = scorm_get_parent($sco);
256                     scorm_seq_set('suspended',$parentsco->id,$userid);
257                 } else {
258                     $seq->termination = false;
259                     $seq->exception = 'TB.2.3-3';
260                     // return $seq;
261                 }
262             }
263             if ($ancestors = scorm_get_ancestors($sco)) {
264                 foreach ($ancestors as $ancestor) {
265                     scorm_seq_set('active',$ancestor->id,$userid,false);
266                     scorm_seq_set('suspended',$ancestor->id,$userid);
267                     $seq->currentactivity = $ancestor;
268                 }
269                 $seq->termination = true;
270                 $seq->sequencing = 'exit';
271             } else {
272                 $seq->termination = false;
273                 $seq->exception = 'TB.2.3-5';
274             }
275         break;
276         case 'abandon':
277             scorm_seq_set('active',$sco->id,$userid,false);
278             $seq->active = null;
279             $seq->termination = true;
280         break;
281         case 'abandonall':
282             if ($ancestors = scorm_get_ancestors($sco)) {
283                 foreach ($ancestors as $ancestor) {
284                     scorm_seq_set('active',$ancestor->id,$userid,false);
285                     $seq->currentactivity = $ancestor;
286                 }
287                 $seq->termination = true;
288                 $seq->sequencing = 'exit';
289             } else {
290                 $seq->termination = false;
291                 $seq->exception = 'TB.2.3-6';
292             }
293         break;
294         default:
295             $seq->termination = false;
296             $seq->exception = 'TB.2.3-7';
297         break;
298     }
299     return $seq;
302 function scorm_seq_end_attempt($sco,$userid,$seq) {
303     global $DB;
305     if (scorm_is_leaf($sco)) {
306         if (!isset($sco->tracked) || ($sco->tracked == 1)) {
307             if (!scorm_seq_is('suspended',$sco->id,$userid)) {
308                 if (!isset($sco->completionsetbycontent) || ($sco->completionsetbycontent == 0)) {
309                     if (!scorm_seq_is('attemptprogressstatus',$sco->id,$userid,$seq->attempt)) {
310                   // if (!scorm_seq_is('attemptprogressstatus',$sco->id,$userid)) {
311                         scorm_seq_set('attemptprogressstatus',$sco->id,$userid);
312                         scorm_seq_set('attemptcompletionstatus',$sco->id,$userid);
313                     }
314                 }
315                 if (!isset($sco->objectivesetbycontent) || ($sco->objectivesetbycontent == 0)) {
316                     if ($objectives = $DB->get_records('scorm_seq_objective', array('scoid'=>$sco->id))) {
317                         foreach ($objectives as $objective) {
318                             if ($objective->primaryobj) {
319                                 //if (!scorm_seq_objective_progress_status($sco,$userid,$objective)) {
320                                 if (!scorm_seq_is('objectiveprogressstatus',$sco->id,$userid)) {
321                                     scorm_seq_set('objectiveprogressstatus',$sco->id,$userid);
322                                     scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid);
323                                 }
324                             }
325                         }
326                     }
327                 }
328             }
329         }
330     } else {
331         if ($children = scorm_get_children($sco)) {
332             $suspended = false;
333             foreach ($children as $child) {
334                 if (scorm_seq_is('suspended',$child,$userid)) {
335                     $suspended = true;
336                     break;
337                 }
338             }
339             if ($suspended) {
340                 scorm_seq_set('suspended',$sco,$userid);
341             } else {
342                 scorm_seq_set('suspended',$sco,$userid,false);
343             }
344         }
345     }
346     scorm_seq_set('active',$sco,$userid,0,false);
347     scorm_seq_overall_rollup($sco,$userid);
350 function scorm_seq_is($what, $scoid, $userid, $attempt=0) {
351     global $DB;
353     /// Check if passed activity $what is active
354     $active = false;
355     if ($track = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'attempt'=>$attempt,'element'=>$what))) {
356         $active = true;
357     }
358     return $active;
361 function scorm_seq_set($what, $scoid, $userid, $attempt=0, $value='true') {
362     global $DB;
364     $sco = scorm_get_sco($scoid);
366     /// set passed activity to active or not
367     if ($value == false) {
368         $DB->delete_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'attempt'=>$attempt,'element'=>$what));
369     } else {
370         scorm_insert_track($userid, $sco->scorm, $sco->id, 0, $what, $value);
371     }
373     // update grades in gradebook
374     $scorm = $DB->get_record('scorm', array('id'=>$sco->scorm));
375     scorm_update_grades($scorm, $userid, true);
378 function scorm_seq_exit_action_rules($seq,$userid) {
379     $sco = $seq->currentactivity;
380     $ancestors = scorm_get_ancestors($sco);
381     $exittarget = null;
382     foreach (array_reverse($ancestors) as $ancestor) {
383         if (scorm_seq_rules_check($ancestor,'exit') != null) {
384             $exittarget = $ancestor;
385             break;
386         }
387     }
388     if ($exittarget != null) {
389         $commons = array_slice($ancestors,0,scorm_find_common_ancestor($ancestors,$exittarget));
391         /// Terminate Descendent Attempts Process
392         if ($commons) {
393             foreach ($commons as $ancestor) {
395                 scorm_seq_end_attempt($ancestor,$userid,$seq->attempt);
396                 $seq->currentactivity = $ancestor;
397             }
398         }
399     }
400     return $seq;
403 function scorm_seq_post_cond_rules($seq,$userid) {
404     $sco = $seq->currentactivity;
405     if (!$seq->suspended) {
406         if ($action = scorm_seq_rules_check($sco,'post') != null) {
407             switch($action) {
408                 case 'retry':
409                 case 'continue':
410                 case 'previous':
411                     $seq->sequencing = $action;
412                 break;
413                 case 'exitparent':
414                 case 'exitall':
415                     $seq->termination = $action;
416                 break;
417                 case 'retryall':
418                     $seq->termination = 'exitall';
419                     $seq->sequencing = 'retry';
420                 break;
421             }
422         }
423     }
424     return $seq;
427 function scorm_seq_rules_check ($sco, $action){
428     global $DB;
430     $act = null;
431     if($rules = $DB->get_records('scorm_seq_ruleconds', array('scoid'=>$sco->id,'action'=>$action))) {
432         foreach ($rules as $rule){
433             if($act = scorm_seq_rule_check($sco,$rule)){
434                 return $act;
435             }
436         }
437     }
438     return $act;
442 function scorm_seq_rule_check ($sco, $rule){
443     global $DB;
445     $bag = Array();
446     $cond = '';
447     $ruleconds = $DB->get_records('scorm_seq_rulecond', array('scoid'=>$sco->id,'ruleconditionsid'=>$rule->id));
448     foreach ($ruleconds as $rulecond){
449          if ($rulecond->operator = 'not') {
450              if ($rulecond->cond != 'unknown' ){
451                 $rulecond->cond = 'not'.$rulecond;
452              }
453          }
454          $bag [$rule->id] = $rulecond->cond;
456     }
457     if (empty($bag)){
458         $cond = 'unknown';
459         return $cond;
460     }
462     $size= sizeof($bag);
463     $i=0;
465     if ($rule->conditioncombination = 'all'){
466         foreach ($bag as $con){
467                 $cond = $cond.' and '.$con;
469         }
470     }
471     else{
472         foreach ($bag as $con){
473             $cond = $cond.' or '.$con;
474         }
475     }
476     return $cond;
480 function scorm_seq_overall_rollup($sco,$userid){//Carlos
482      if ($ancestors = scorm_get_ancestors($sco)) {
483             foreach ($ancestors as $ancestor) {
484                 if(!scorm_is_leaf($ancestor)){
485                     scorm_seq_measure_rollup($sco,$userid);
486                 }
487                 scorm_seq_objective_rollup($sco,$userid);
488                 scorm_seq_activity_progress_rollup($sco,$userid);
490             }
492      }
495 /* For this next function I have defined measure weight and measure status as records with the attempt = 0 on the scorm_scoes_track table. According to the page 89 of the SeqNav.pdf those datas give us some information about the progress of the objective*/
497 function scorm_seq_measure_rollup($sco,$userid){
498     global $DB;
500     $totalmeasure = 0; //Check if there is something similar in the database
501     $valid = false;//Same as in the last line
502     $countedmeasures = 0;//Same too
503     $targetobjective = null;
504     $readable = true;//to check if status and measure weight are readable
505     $objectives = $DB->get_records('scorm_seq_objective', array('scoid'=>$sco->id));
507     foreach ($objectives as $objective){
509         if ($objective->primaryobj == true){//Objective contributes to rollup I'm using primaryobj field, but not
510             $targetobjective = $objective;
511             break;
512         }
514     }
516     if ($targetobjective != null){
517         $children = scorm_get_children($sco);
518         foreach ($children as $child){
519             $child = scorm_get_sco ($child);
520             if (!isset($child->tracked) || ($child->tracked == 1)){
522                 $rolledupobjective = null;// we set the rolled up activity to undefined
523                 $objectives = $DB->get_records('scorm_seq_objective', array('scoid'=>$child->id));
524                 foreach ($objectives as $objective){
525                     if ($objective->primaryobj == true){//Objective contributes to rollup I'm using primaryobj field, but not
526                         $rolledupobjective = $objective;
527                         break;
528                     }
529                 }
530                 if ($rolledupobjective != null){
531                     $child = scorm_get_sco($child->id);
533                     $countedmeasures = $countedmeasures + ($child->measureweight);
534                     if (!scorm_seq_is('objectivemeasurestatus',$sco->id,$userid)) {
535                         $normalizedmeasure = $DB->get_record('scorm_scoes_track', array('scoid'=>$child->id,'userid'=>$userid,'element'=>'objectivenormalizedmeasure'));
536                         $totalmeasure = $totalmeasure + (($normalizedmeasure->value) * ($child->measureweight));
537                         $valid = true;
538                     }
542                 }
543             }
544         }
547         if(!$valid){
549             scorm_seq_set('objectivemeasurestatus',$sco->id,$userid,false);
551         }
552         else{
553             if($countedmeasures>0){
554                 scorm_seq_set('objectivemeasurestatus',$sco->id,$userid);
555                 $val=$totalmeasure/$countedmeasures;
556                 scorm_seq_set('objectivenormalizedmeasure',$sco->id,$userid,$val);
558             }
559             else{
560                 scorm_seq_set('objectivemeasurestatus',$sco->id,$userid,false);
562             }
563         }
565     }
569 function scorm_seq_objective_rollup($sco,$userid){
570     global $DB;
572     scorm_seq_objective_rollup_measure($sco,$userid);
573     scorm_seq_objective_rollup_rules($sco,$userid);
574     scorm_seq_objective_rollup_default($sco,$userid);
576 /*
577     if($targetobjective->satisfiedbymeasure){
578         scorm_seq_objective_rollup_measure($sco,$userid);
579     }
580     else{
581         if ((scorm_seq_rollup_rule_check($sco,$userid,'incomplete'))|| (scorm_seq_rollup_rule_check($sco,$userid,'completed'))){
582             scorm_seq_objective_rollup_rules($sco,$userid);
583         }
584         else{
586             $rolluprules = $DB->get_record('scorm_seq_rolluprule', array('scoid'=>$sco->id,'userid'=>$userid));
587             foreach($rolluprules as $rolluprule){
588                 $rollupruleconds = $DB->get_records('scorm_seq_rolluprulecond', array('rollupruleid'=>$rolluprule->id));
589                 foreach($rollupruleconds as $rolluprulecond){
591                     switch ($rolluprulecond->cond!='satisfied' && $rolluprulecond->cond!='completed' && $rolluprulecond->cond!='attempted'){
593                            scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid, false);
595                         break;
596                     }
597                 }
600         }
601     }
602 */
605 function scorm_seq_objective_rollup_measure($sco,$userid){
606     global $DB;
608     $targetobjective = null;
611     $objectives = $DB->get_records('scorm_seq_objective', array('scoid'=>$sco->id));
612     foreach ($objectives as $objective){
613         if ($objective->primaryobj == true){
614             $targetobjective = $objective;
615             break;
616         }
617     }
618     if ($targetobjective != null){
620         if($targetobjective->satisfiedbymeasure){
623             if (!scorm_seq_is('objectiveprogressstatus',$sco->id,$userid)) {
625                 scorm_seq_set('objectiveprogressstatus',$sco->id,$userid,false);
627             }
629             else{
630                 if (scorm_seq_is('active',$sco->id,$userid)) {
631                     $isactive = true;
632                 }
633                 else{
634                     $isactive = false;
635                 }
637                 $normalizedmeasure = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'objectivenormalizedmeasure'));
639                 $sco = scorm_get_sco ($sco->id);
641                 if (!$isactive || ($isactive && (!isset($sco->measuresatisfactionifactive) || $sco->measuresatisfactionifactive == true))){
642                     if($normalizedmeasure->value >= $targetobjective->minnormalizedmeasure){
643                         scorm_seq_set('objectiveprogressstatus',$sco->id,$userid);
644                         scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid);
645                     }
646                     else{
647                         scorm_seq_set('objectiveprogressstatus',$sco->id,$userid);
648                         scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid,false);
649                     }
650                 }
651                 else{
653                     scorm_seq_set('objectiveprogressstatus',$sco->id,$userid,false);
655                 }
656             }
657         }
658     }
662 function scorm_seq_objective_rollup_default($sco,$userid){
663     global $DB;
665     if (!(scorm_seq_rollup_rule_check($sco,$userid,'incomplete')) && !(scorm_seq_rollup_rule_check($sco,$userid,'completed'))){
667             $rolluprules = $DB->get_record('scorm_seq_rolluprule', array('scoid'=>$sco->id,'userid'=>$userid));
668             foreach($rolluprules as $rolluprule){
669                 $rollupruleconds = $DB->get_records('scorm_seq_rolluprulecond', array('rollupruleid'=>$rolluprule->id));
670                 foreach($rollupruleconds as $rolluprulecond){
672                     if ($rolluprulecond->cond!='satisfied' && $rolluprulecond->cond!='completed' && $rolluprulecond->cond!='attempted'){
674                            scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid, false);
676                         break;
677                     }
678                 }
681             }
682     }
687 function scorm_seq_objective_rollup_rules($sco,$userid){
688     global $DB;
690     $targetobjective = null;
692     $objectives = $DB->get_records('scorm_seq_objective', array('scoid'=>$sco->id));
693     foreach ($objectives as $objective){
694         if ($objective->primaryobj == true){//Objective contributes to rollup I'm using primaryobj field, but not
695             $targetobjective = $objective;
696             break;
697         }
698     }
699     if ($targetobjective != null){
703         if(scorm_seq_rollup_rule_check($sco,$userid,'notsatisfied')){//with not satisfied rollup for the activity
706             scorm_seq_set('objectiveprogressstatus',$sco->id,$userid);
707             scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid,false);
708         }
709         if(scorm_seq_rollup_rule_check($sco,$userid,'satisfied')){//with satisfied rollup for the activity
710             scorm_seq_set('objectiveprogressstatus',$sco->id,$userid);
711             scorm_seq_set('objectivesatisfiedstatus',$sco->id,$userid);
712         }
714     }
718 function scorm_seq_activity_progress_rollup ($sco, $userid){
720     if(scorm_seq_rollup_rule_check($sco,$userid,'incomplete')){
721         //incomplete rollup action
722         scorm_seq_set('attemptcompletionstatus',$sco->id,$userid,false,$seq->attempt);
723         scorm_seq_set('attemptprogressstatus',$sco->id,$userid,true,$seq->attempt);
725     }
726     if(scorm_seq_rollup_rule_check($sco,$userid,'completed')){
727         //incomplete rollup action
728         scorm_seq_set('attemptcompletionstatus',$sco->id,true,$userid);
729         scorm_seq_set('attemptprogressstatus',$sco->id,true,$userid);
730     }
734 function scorm_seq_rollup_rule_check ($sco,$userid,$action){
735     global $DB;
737      if($rolluprules = $DB->get_record('scorm_seq_rolluprule', array('scoid'=>$sco->id,'userid'=>$userid,'action'=>$action))) {
739         $childrenbag = Array ();
740         $children = scorm_get_children ($sco);
742         foreach($rolluprules as $rolluprule){
744             foreach ($children as $child){
746                 /*$tracked = $DB->get_records('scorm_scoes_track', array('scoid'=>$child->id,'userid'=>$userid));
747                 if($tracked && $tracked->attemp != 0){*/
748                  $child = scorm_get_sco ($child);
749             if (!isset($child->tracked) || ($child->tracked == 1)){
751                     if(scorm_seq_check_child ($child,$action,$userid)){
753                         $rollupruleconds = $DB->get_records('scorm_seq_rolluprulecond', array('rollupruleid'=>$rolluprule->id));
754                         $evaluate = scorm_seq_evaluate_rollupcond($child,$rolluprule->conditioncombination,$rollupruleconds,$userid);
755                         if ($evaluate=='unknown'){
756                             array_push($childrenbag,'unknown');
757                         }
758                         else{
759                             if($evaluate == true){
760                                 array_push($childrenbag,true);
761                             }
762                             else{
763                                 array_push($childrenbag,false);
764                             }
765                         }
766                     }
767                 }
769             }
770             $change = false;
772             switch ($rolluprule->childactivityset){
774                 case 'all':
775                     if((array_search(false,$childrenbag)===false)&&(array_search('unknown',$childrenbag)===false)){//I think I can use this condition instead equivalent to OR
776                         $change = true;
777                     }
778                 break;
780                 case 'any':
781                     if(array_search(true,$childrenbag)!==false){//I think I can use this condition instead equivalent to OR
782                         $change = true;
783                     }
784                 break;
786                 case 'none':
787                     if((array_search(true,$childrenbag)===false)&&(array_search('unknown',$childrenbag)===false)){//I think I can use this condition instead equivalent to OR
788                         $change = true;
789                     }
790                 break;
792                 case 'atleastcount':
793                     foreach ($childrenbag as $itm){//I think I can use this condition instead equivalent to OR
794                         $cont = 0;
795                         if($itm === true){
796                             $cont++;
797                         }
798                         if($cont >= $rolluprule->minimumcount){
799                             $change = true;
800                         }
801                     }
802                 break;
804                 case 'atleastcount':
805                     foreach ($childrenbag as $itm){//I think I can use this condition instead equivalent to OR
806                         $cont = 0;
807                         if($itm === true){
808                             $cont++;
809                         }
810                         if($cont >= $rolluprule->minimumcount){
811                             $change = true;
812                         }
813                     }
814                 break;
816                 case 'atleastpercent':
817                     foreach ($childrenbag as $itm){//I think I can use this condition instead equivalent to OR
818                         $cont = 0;
819                         if($itm === true){
820                             $cont++;
821                         }
822                         if(($cont/sizeof($childrenbag)) >= $rolluprule->minimumcount){
823                             $change = true;
824                         }
825                     }
826                 break;
827             }
828             if ($change==true){
829                 return true;
830             }
831         }
832      }
833      return false;
837 function scorm_seq_evaluate_rollupcond($sco,$conditioncombination,$rollupruleconds,$userid){
838     $bag = Array();
839     $con = "";
840     $val = false;
841     $unk = false;
842     foreach($rollupruleconds as $rolluprulecond){
844         $condit = scorm_evaluate_cond($rolluprulecond,$sco,$userid);
846         if($rule->operator=='not'){// If operator is not, negate the condition
847             if ($rule->cond != 'unknown'){
848                 if ($condit){
849                     $condit = false;
850                 }
851                 else{
852                     $condit = true;
853                 }
854             }
855             else{
856                 $condit = 'unknown';
857             }
858             array_push($childrenbag,$condit);
859         }
861     }
862     if (empty($bag)){
863         return 'unknown';
864     }
865     else{
866         $i = 0;
867         foreach ($bag as $b){
869              if ($rolluprule->conditioncombination == 'all'){
871                  $val = true;
872                  if($b == 'unknown'){
873                      $unk = true;
874                  }
875                  if($b === false){
876                      return false;
877                  }
878              }
880              else{
882                 $val = false;
884                 if($b == 'unknown'){
885                      $unk = true;
886                 }
887                 if($b === true){
888                     return true;
889                 }
890              }
893         }
894     }
895     if ($unk){
896         return 'unknown';
897     }
898     return $val;
902 function scorm_evaluate_condition ($rolluprulecond,$sco,$userid){
903     global $DB;
905             $res = false;
907             switch ($rolluprulecond->cond){
909                 case 'satisfied':
910                      if($r=$DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'objectivesatisfiedstatus'))) {
911                         if($r->value == true){
912                             if ($r=$DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'objectiveprogressstatus'))) {
913                                 if($r->value == true){
914                                    $res= true;
915                                 }
916                             }
917                         }
918                     }
919                 break;
921                 case 'objectiveStatusKnown':
922                     if ($r=$DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'objectiveprogressstatus'))) {
923                         if($r->value == true){
924                             $res= true;
925                         }
926                     }
927                 break;
929                 case 'objectiveMeasureKnown':
930                     if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'objectivemeasurestatus'))) {
931                         if($r->value == true){
932                             $res = true;
933                         }
935                     }
937                 break;
939                 case 'completed':
940                     if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'attemptcompletionstatus'))) {
941                         if($r->value){
942                             if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'attemptprogressstatus'))) {
943                                if($r->value){
944                                   $res = true;
945                                }
947                             }
948                         }
950                     }
951                 break;
953                 case 'attempted':
954                     if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'activityprogressstatus'))) {
955                         if($r->value){
956                             if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'activityattemptcount'))) {
957                                 if($r->value > 0){
958                                     $res = true;
959                                 }
961                             }
962                         }
964                     }
965                 break;
968                 case 'attemptLimitExceeded':
969                     if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'activityprogressstatus'))) {
970                         if($r->value){
971                             if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'limitconditionattemptlimitcontrol'))) {
972                                 if($r->value){
973                                    if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'activityattemptcount')) && $r2 = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'limitconditionattemptlimit')) ){
974                                        if($r->value >= $r2->value){
975                                            $res = true;
976                                        }
978                                    }
980                                 }
982                             }
984                         }
986                     }
988                 break;
990                 case 'activityProgressKnown':
992                     if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'activityprogressstatus'))) {
993                         if($r->value){
994                             if ($r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'attemptprogressstatus'))) {
995                                 if($r->value){
996                                     $res = true;
997                                 }
999                             }
1001                         }
1003                     }
1005                 break;
1006             }
1007             return $res;
1011 function scorm_seq_check_child ($sco, $action, $userid){
1012     global $DB;
1014     $included = false;
1015     $sco=scorm_get_sco($sco->id);
1016     $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$sco->id,'userid'=>$userid,'element'=>'activityattemptcount'));
1017     if ($action == 'satisfied' || $action == 'notsatisfied'){
1018       if (!$sco->rollupobjectivesatisfied){
1019         $included = true;
1020         if (($action == 'satisfied' && $sco->requiredforsatisfied == 'ifnotsuspended') || ($action == 'notsatisfied' && $sco->requiredfornotsatisfied == 'ifnotsuspended')){
1022             if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || ((($r->value)>0)&& !scorm_seq_is('suspended',$sco->id,$userid))){
1023                 $included = false;
1024             }
1026         }
1027         else{
1028             if (($action == 'satisfied' && $sco->requiredforsatisfied == 'ifattempted') || ($action == 'notsatisfied' && $sco->requiredfornotsatisfied == 'ifattempted')){
1029                 if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || (($r->value) == 0)){
1030                     $included = false;
1031                 }
1032             }
1033             else{
1034                 if (($action == 'satisfied' && $sco->requiredforsatisfied == 'ifnotskipped') || ($action == 'notsatisfied' && $sco->requiredfornotsatisfied == 'ifnotskipped')){
1035                     $rulch = scorm_seq_rules_check($sco, 'skip');
1036                     if ($rulch != null){
1037                         $included = false;
1038                     }
1039                 }
1040             }
1041         }
1042       }
1043     }
1044     if ($action == 'completed' || $action == 'incomplete'){
1045         if (!$sco->rollupprogresscompletion){
1046             $included = true;
1048             if (($action == 'completed' && $sco->requiredforcompleted == 'ifnotsuspended') || ($action == 'incomplete' && $sco->requiredforincomplete == 'ifnotsuspended')){
1050                 if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || ( (($r->value)>0)&& !scorm_seq_is('suspended',$sco->id,$userid))){
1051                     $included = false;
1052                 }
1054             }
1055             else{
1057                 if (($action == 'completed' && $sco->requiredforcompleted == 'ifattempted') || ($action == 'incomplete' && $sco->requiredforincomplete == 'ifattempted')){
1058                     if (!scorm_seq_is('activityprogressstatus',$sco->id,$userid) || (($r->value)==0)){
1059                         $included = false;
1060                     }
1062                 }
1063                 else{
1064                     if (($action == 'completed' && $sco->requiredforsatisfied == 'ifnotskipped') || ($action == 'incomplete' && $sco->requiredfornotsatisfied == 'ifnotskipped')){
1065                         $rulch = scorm_seq_rules_check($sco, 'skip');
1066                         if ($rulch != null){
1067                             $included = false;
1068                         }
1069                     }
1070                 }
1073             }
1075         }
1076     }
1077     return $included;
1081 function scorm_seq_sequencing ($scoid,$userid,$seq) {
1083     switch ($seq->sequencing) {
1085         case 'start':
1086             $seq = scorm_seq_start_sequencing($scoid,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1087             $seq->sequencing = true;
1090             break;
1092         case 'resumeall':
1093             $seq = scorm_seq_resume_sequencing($scoid,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1094             $seq->sequencing = true;
1098             break;
1100         case 'exit':
1101              $seq = scorm_seq_exit_sequencing($scoid,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1102             $seq->sequencing = true;
1106             break;
1108         case 'retry':
1109             $seq = scorm_seq_retry_sequencing($scoid,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1110             $seq->sequencing = true;
1113             break;
1115         case 'previous':
1116             $seq = scorm_seq_previous_sequencing($scoid,$userid,$seq);// We'll see the parameters we have to send, this should update delivery and end
1117             $seq->sequencing = true;
1120             break;
1122         case 'choice':
1123             $seq = scorm_seq_choice_sequencing($scoid,$userid,$seq);// We'll see the parameters we have to send, this should update delivery and end
1124              $seq->sequencing = true;
1127             break;
1129     }
1131     if ($seq->exception != null){
1132         $seq->sequencing = false;
1133         return $seq;
1134     }
1136     $seq->sequencing= true;
1137     return $seq;
1141 function scorm_seq_start_sequencing($scoid,$userid,$seq){
1142     global $DB;
1144     if (!empty($seq->currentactivity)) {
1145         $seq->delivery = null;
1146         $seq->exception = 'SB.2.5-1';
1147         return $seq;
1148     }
1149     $sco = $DB->get_record('scorm_scoes', array('scoid'=>$scoid,'userid'=>$userid));
1150     if (($sco->parent == '/') && scorm_is_leaf($sco)) {//if the activity is the root and is leaf
1151         $seq->delivery = $sco;
1152     }
1153     else{
1154         $ancestors = scorm_get_ancestors($sco);
1155         $ancestorsroot = array_reverse($ancestors);
1156         $res = scorm_seq_flow($ancestorsroot[0],'forward',$seq,true,$userid);
1157         if($res){
1158             return $res;
1159         }
1160         else{
1161             //return end and exception
1162         }
1163     }
1166 function scorm_seq_resume_all_sequencing($scoid,$userid,$seq){
1167     global $DB;
1169     if (!empty($seq->currentactivity)){
1170         $seq->delivery = null;
1171         $seq->exception = 'SB.2.6-1';
1172         return $seq;
1173     }
1174     $track = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'suspendedactivity'));
1175     if (!$track) {
1176         $seq->delivery = null;
1177         $seq->exception = 'SB.2.6-2';
1178         return $seq;
1179     }
1180     $seq->delivery = $DB->get_record('scorm_scoes', array('scoid'=>$scoid,'userid'=>$userid));//we assign the sco to the delivery
1184 function scorm_seq_continue_sequencing($scoid,$userid,$seq){
1185     if (empty($seq->currentactivity)) {
1186         $seq->delivery = null;
1187         $seq->exception = 'SB.2.7-1';
1188         return $seq;
1189     }
1190     $currentact= $seq->currentactivity;
1191     if ($currentact->parent != '/') {//if the activity is the root and is leaf
1192         $parent = scorm_get_parent ($currentact);
1194          if (!isset($parent->flow) || ($parent->flow == false)) {
1195             $seq->delivery = null;
1196             $seq->exception = 'SB.2.7-2';
1197             return $seq;
1198         }
1200         $res = scorm_seq_flow($currentact,'forward',$seq,false,$userid);
1201         if($res){
1202             return $res;
1203         }
1204         else{
1205             //return end and exception
1206         }
1208     }
1211 function scorm_seq_previous_sequencing($scoid,$userid,$seq){
1212     if (empty($seq->currentactivity)) {
1213         $seq->delivery = null;
1214         $seq->exception = 'SB.2.8-1';
1215         return $seq;
1216     }
1218     $currentact= $seq->currentactivity;
1219     if ($currentact->parent != '/') {//if the activity is the root and is leaf
1220         $parent = scorm_get_parent ($activity); // TODO: undefined!!
1221         if (!isset($parent->flow) || ($parent->flow == false)) {
1222             $seq->delivery = null;
1223             $seq->exception = 'SB.2.8-2';
1224             return $seq;
1225         }
1227         $res = scorm_seq_flow($currentact,'backward',$seq,false,$userid);
1228         if($res){
1229             return $res;
1230         }
1231         else{
1232             //return end and exception
1233         }
1235     }
1239 function scorm_seq_exit_sequencing($scoid,$userid,$seq){
1240     if (empty($seq->currentactivity)) {
1241         $seq->delivery = null;
1242         $seq->exception = 'SB.2.11-1';
1243         return $seq;
1244     }
1246      if ($seq->active){
1247          $seq->endsession = false;
1248          $seq->exception = 'SB.2.11-2';
1249          return $seq;
1250      }
1251      $currentact= $seq->currentactivity;
1252      if ($currentact->parent == '/'){
1253          $seq->endsession = true;
1254          return $seq;
1255      }
1257     $seq->endsession = false;
1258     return $seq;
1262 function scorm_seq_retry_sequencing($scoid,$userid,$seq){
1263     if (empty($seq->currentactivity)) {
1264         $seq->delivery = null;
1265         $seq->exception = 'SB.2.10-1';
1266         return $seq;
1267     }
1268     if ($seq->active || $seq->suspended){
1269         $seq->delivery = null;
1270         $seq->exception = 'SB.2.10-2';
1271         return $seq;
1272     }
1274     if (!scorm_is_leaf($seq->currentactivity)){
1275         $res = scorm_seq_flow($seq->currentactivity,'forward',$seq,true,$userid);
1276         if($res != null){
1277             return $res;
1278             //return deliver
1279         }
1280         else{
1281             $seq->delivery = null;
1282             $seq->exception = 'SB.2.10-3';
1283             return $seq;
1284         }
1285     }
1286     else{
1287         $seq->delivery = $seq->currentactivity;
1288         return $seq;
1289     }
1293 function scorm_seq_flow ($candidate,$direction,$seq,$childrenflag,$userid){
1294     //$PREVDIRECTION NOT DEFINED YET
1296     $activity=$candidate;
1297     $deliverable=false;
1298     $previdirection = null;
1299     $seq = scorm_seq_flow_tree_traversal ($activity,$direction,$childrenflag,$prevdirection,$seq,$userid); // TODO: undefined
1300     if($seq->identifiedactivity == null){//if identifies
1301         $seq->identifiedactivity = $candidate;
1302         $seq->deliverable = false;
1303         return $seq;
1304     }
1305     else{
1306         $activity = $seq->identifiedactivity;
1307         $seq = scorm_seq_flow_activity_traversal($activity,$userid,$direction,$childrenflag,$prevdirection,$seq,$userid);//
1308         return $seq;
1310     }
1313 function scorm_seq_flow_activity_traversal ($activity, $userid, $direction, $childrenflag, $prevdirection, $seq,$userid){//returns the next activity on the tree, traversal direction, control returned to the LTS, (may) exception
1314     $activity = scorm_get_sco ($activity);
1315     $parent = scorm_get_parent ($activity);
1316    if (!isset($parent->flow) || ($parent->flow == false)) {
1317         $seq->deliverable = false;
1318         $seq->exception = 'SB.2.2-1';
1319         $seq->nextactivity = $activity;
1320         return $seq;
1321     }
1323     $rulch = scorm_seq_rules_check($sco, 'skipped'); // TODO: undefined
1324     if ($rulch != null){
1325         $seq = scorm_seq_flow_tree_traversal ($activity, $direction, false, $prevdirection, $seq,$userid);//endsession and exception
1326         if ($seq->identifiedactivity == null){
1327             $seq->deliverable = false;
1328             $seq->nextactivity = $activity;
1329             return $seq;
1330         }
1331         else{
1333             if ($prevdirection = 'backward' && $seq->traversaldir == 'backward'){
1334                 $seq = scorm_seq_flow_tree_traversal ($activity,$direction,false,null,$seq,$userid);
1335                 $seq = scorm_seq_flow_activity($seq->identifiedactivity, $userid, $direction, $childrenflag, $prevdirection, $seq,$userid);
1336             }
1337             else{
1338                 $seq = scorm_seq_flow_tree_traversal ($activity,$direction,false,null,$seq,$userid);
1339                 $seq = scorm_seq_flow_activity($seq->identifiedactivity, $userid, $direction, $childrenflag, $prevdirection, $seq,$userid);
1340             }
1341             return $seq;
1342         }
1343     }
1345     $ch=scorm_check_activity ($activity,$userid);
1347     if ($ch){
1349         $seq->deliverable = false;
1350         $seq->exception = 'SB.2.2-2';
1351         $seq->nextactivity = $activity;
1352         return $seq;
1354     }
1356     if (!scorm_is_leaf($activity)){
1358         $seq = scorm_seq_flow_tree_traversal ($activity,$direction,true,null,$seq,$userid);
1360         if ($seq->identifiedactivity == null){
1361             $seq->deliverable = false;
1362             $seq->nextactivity = $activity;
1363             return $seq;
1364         }
1366         else{
1367             if($direction == 'backward' && $seq->traversaldir == 'forward'){
1368                 $seq = scorm_seq_flow_activity($seq->identifiedactivity, $userid, 'forward', $childrenflag, 'backward', $seq,$userid);
1369             }
1370             else{
1371                 scorm_seq_flow_activity($seq->identifiedactivity, $userid, $direction, $childrenflag, null, $seq,$userid);
1372             }
1373             return $seq;
1374         }
1376     }
1378     $seq->deliverable = true;
1379     $seq->nextactivity = $activity;
1380     return $seq;
1383 function scorm_seq_flow_tree_traversal ($activity,$direction,$childrenflag,$prevdirection,$seq,$userid){
1385     $revdirection = false;
1386     $parent = scorm_get_parent ($activity);
1387     $children = scorm_get_available_children ($parent);
1388     $siz = sizeof ($children);
1390     if (($prevdirection != null && $prevdirection == 'backward') && ($children[$siz-1]->id == $activity->id)){
1391         $direction = 'backward';
1392         $children[0] = $activity;
1393         $revdirection = true;
1394     }
1396     if($direction = 'forward'){
1397         $ancestors = scorm_get_ancestors($activity);
1398         $ancestorsroot = array_reverse($ancestors);
1399         $preorder = scorm_get_preorder ($ancestorsroot);
1400         $siz= sizeof ($preorder);
1401         if (($activity->id == $preorder[$siz-1]->id) || (($activity->parent == '/') && !($childrenflag))){
1402             scorm_seq_terminate_descent($ancestorsroot,$userid);
1403             $seq->endsession = true;
1404             $seq->nextactivity = null;
1405             return $seq;
1406         }
1407         if (scorm_is_leaf ($activity) || !$childrenflag){
1408             if ($children[$siz-1]->id == $activity->id){
1410                 $seq = scorm_seq_flow_tree_traversal ($parent, $direction, false, null, $seq,$userid);
1411                 // I think it's not necessary to do a return in here
1412             }
1413             else{
1414                 $parent = scorm_get_parent($activity);
1415                 $children = scorm_get_available_children($parent);
1416                 $seq->traversaldir = $direction;
1417                 $sib = scorm_get_siblings($activity);
1418                 $pos = array_search($sib, $activity);
1419                 if ($pos !== false) {
1420                     if ($pos != sizeof ($sib)){
1421                         $seq->nextactivity = $sib [$pos+1];
1422                         return $seq;
1423                     }
1424                     else{
1425                         $ch = scorm_get_children($sib[0]);
1426                         $seq->nextactivity = $ch[0];
1427                         return $seq;
1428                     }
1429                 }
1430             }
1431         }
1432         else{
1433             if (!empty ($children)){
1434                 $seq->traversaldir = $direction;
1435                 $seq->nextactivity = $children[0];
1436                 return $seq;
1437             }
1438             else{
1439                 $seq->traversaldir = null;
1440                 $seq->nextactivity = $children[0];
1441                 $seq->exception = 'SB.2.1-2';
1442                 return $seq;
1443             }
1444         }
1446     }
1447     if($direction = 'backward'){
1449          if ($activity->parent == '/'){
1450             $seq->traversaldir = null;
1451             $seq->nextactivity = null;
1452             $seq->exception = 'SB.2.1-3';
1453             return $seq;
1454          }
1455          if (scorm_is_leaf ($activity) || !$childrenflag){
1456              if (!$revdirection){
1457                  if (isset($parent->forwardonly) && ($parent->forwardonly == true)) {
1458                      $seq->traversaldir = null;
1459                      $seq->nextactivity = null;
1460                      $seq->exception = 'SB.2.1-4';
1461                      return $seq;
1462                  }
1463              }
1464              if ($children[0]->id == $activity->id){
1465                 $seq = scorm_seq_flow_tree_traversal ($parent, 'backward', false, null, $seq);
1466                 return $seq;
1467              }
1468              else{
1469                 $ancestors = scorm_get_ancestors($activity);
1470                 $ancestorsroot = array_reverse ($ancestors);
1471                 $preorder = scorm_get_preorder ($ancestorsroot);
1472                 $pos = array_search($preorder, $children[$siz]);
1473                 $preord = array_slice($preorder, 0, $pos-1);
1474                 $revpreorder = array_reverse($preord);
1475                 $position = array_search($revpreorder, $activity);
1476                 $seq->nextactivity = $revpreorder[$pos+1];
1477                 $seq->traversaldir = $direction;
1478                 return $seq;
1479              }
1480          }
1481          else{
1482              if (!empty($children)){
1483                  $activity = scorm_get_sco($activity->id);
1484                  if (isset($parent->flow) && ($parent->flow == true)) {
1485                      $children = scorm_get_children ($activity);
1486                      $seq->traversaldir = 'forward';
1487                      $seq->nextactivity = $children[0];
1488                      return $seq;
1490                  }
1491                  else{
1492                      $children = scorm_get_children ($activity);
1493                      $seq->traversaldir = 'backward';
1494                      $seq->nextactivity = $children[sizeof($children)-1];
1495                      return $seq;
1496                  }
1498              }
1499              else{
1501                      $seq->traversaldir = null;
1502                      $seq->nextactivity = null;
1503                      $seq->exception = 'SB.2.1-2';
1504                      return $seq;
1505              }
1506          }
1508     }
1512 function scorm_check_activity ($activity,$userid){
1513     $act = scorm_seq_rules_check($activity,'disabled');
1514     if ($act != null){
1515         return true;
1516     }
1517     if(scorm_limit_cond_check ($activity,$userid)){
1518         return true;
1519     }
1520     return false;
1525 function scorm_limit_cond_check ($activity,$userid){
1526     global $DB;
1528     if (isset($activity->tracked) && ($activity->tracked == 0)){
1530         return false;
1531     }
1533     if (scorm_seq_is('active',$activity->id,$userid) || scorm_seq_is('suspended',$activity->id,$userid)){
1534         return false;
1535     }
1537     if (!isset($activity->limitcontrol) || ($activity->limitcontrol == 1)){
1538         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityattemptcount'));
1539         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitattempt)){
1540             return true;
1541         }
1542     }
1544      if (!isset($activity->limitabsdurcontrol) || ($activity->limitabsdurcontrol == 1)){
1545         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityabsoluteduration'));
1546         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitabsduration)){
1547             return true;
1548         }
1549     }
1551     if (!isset($activity->limitexpdurcontrol) || ($activity->limitexpdurcontrol == 1)){
1552         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityexperiencedduration'));
1553         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitexpduration)){
1554             return true;
1555         }
1556     }
1558      if (!isset($activity->limitattabsdurcontrol) || ($activity->limitattabsdurcontrol == 1)){
1559         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptabsoluteduration'));
1560         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitattabsduration)){
1561             return true;
1562         }
1563     }
1565     if (!isset($activity->limitattexpdurcontrol) || ($activity->limitattexpdurcontrol == 1)){
1566         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptexperiencedduration'));
1567         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitattexpduration)){
1568             return true;
1569         }
1570     }
1572     if (!isset($activity->limitbegincontrol) || ($activity->limitbegincontrol == 1)){
1573         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'begintime'));
1574         if (time()>=$activity->limitbegintime){
1575             return true;
1576         }
1577     }
1579     if (!isset($activity->limitbegincontrol) || ($activity->limitbegincontrol == 1)){
1580         if (time()<$activity->limitbegintime){
1581             return true;
1582         }
1583     }
1585     if (!isset($activity->limitendcontrol) || ($activity->limitendcontrol == 1)){
1587         if (time()>$activity->limitendtime){
1588             return true;
1589         }
1590     }
1591     return false;
1597 function scorm_seq_choice_sequencing($sco,$userid,$seq){
1599     $avchildren = Array ();
1600     $comancestor = null;
1601     $traverse = null;
1603     if ($sco == null){
1604         $seq->delivery = null;
1605         $seq->exception = 'SB.2.9-1';
1606         return $seq;
1607     }
1609     $ancestors = scorm_get_ancestors($sco);
1610     $arrpath = array_reverse($ancestors);
1611     array_push ($arrpath,$sco);//path from the root to the target
1613     foreach ($arrpath as $activity){
1615         if ($activity->parent != '/') {
1616             $avchildren = scorm_get_available_children (scorm_get_parent($activity));
1617             $position = array_search($avchildren, $activity);
1618             if ($position !== false){
1619                 $seq->delivery = null;
1620                 $seq->exception = 'SB.2.9-2';
1621                 return $seq;
1622             }
1623         }
1625         if (scorm_seq_rules_check($activity,'hidefromchoice' != null)){
1627             $seq->delivery = null;
1628             $seq->exception = 'SB.2.9-3';
1629             return $seq;
1631         }
1633     }
1635     if ($sco->parent != '/') {
1636         $parent = scorm_sco_get_parent ($sco);
1637         if ( isset($parent->choice) && ($parent->choice == false)){
1638             $seq->delivery = null;
1639             $seq->exception = 'SB.2.9-4';
1640             return $seq;
1641         }
1642     }
1644     if ($seq->currentactivity != null){
1645         $commonpos = scorm_find_common_ancestor($ancestors,$seq->currentactivity);
1646         $comancestor = $arrpath [$commonpos];
1647     }
1648     else{
1649         $comancestor = $arrpath [0];
1650     }
1652     if($seq->currentactivity === $sco) {
1653         break;
1654     }
1656     $sib = scorm_get_siblings($seq->currentactivity);
1657     $pos = array_search($sib, $sco);
1659     if ($pos !== false){
1661         $siblings = array_slice($sib, 0, $pos-1);
1663         if (empty($siblings)){
1665             $seq->delivery = null;
1666             $seq->exception = 'SB.2.9-5';
1667             return $seq;
1669         }
1671         $children = scorm_get_children (scorm_get_parent ($sco));
1672         $pos1 = array_search($children, $sco);
1673         $pos2 = array_search($seq->currentactivity, $sco);
1674         if ($pos1>$pos2){
1675             $traverse = 'forward';
1676         }
1677         else{
1678             $traverse = 'backward';
1679         }
1681         foreach ($siblings as $sibling){
1682             $seq = scorm_seq_choice_activity_traversal($sibling,$userid,$seq,$traverse);
1683             if(!$seq->reachable){
1684                 $seq->delivery = null;
1685                 return $seq;
1686             }
1687         }
1688         break;
1690     }
1692     if($seq->currentactivity == null || $seq->currentactivity == $comancestor){
1693         $commonpos = scorm_find_common_ancestor($ancestors,$seq->currentactivity);
1694         $comtarget = array_slice($ancestors, 1,$commonpos-1);//path from the common ancestor to the target activity
1695         $comtarget = array_reverse($comtarget);
1697         if (empty($comtarget)){
1698             $seq->delivery = null;
1699             $seq->exception = 'SB.2.9-5';
1700             return $seq;
1701         }
1702         foreach ($comtarget as $act){
1703             $seq = scorm_seq_choice_activity_traversal($act,$userid,$seq,'forward');
1704             if(!$seq->reachable){
1705                 $seq->delivery = null;
1706                 return $seq;
1707             }
1708             $act = scorm_get_sco ($acti->id);
1709             if(scorm_seq_is('active',$act->id,$userid) && ($act->id != $comancestor->id && $act->preventactivation)){//adlseq:can i write it like another property for the $seq object?
1710                 $seq->delivery = null;
1711                 $seq->exception = 'SB.2.9-6';
1712                 return $seq;
1713             }
1714         }
1715         break;
1717     }
1719     if ($comancestor->id == $sco->id){
1721         $ancestorscurrent = scorm_get_ancestors($seq->currentactivity);
1722         $possco = array_search ($ancestorscurrent, $sco);
1723         $curtarget = array_slice($ancestorscurrent,0,$possco);//path from the current activity to the target
1725         if (empty($curtarget)){
1726             $seq->delivery = null;
1727             $seq->exception = 'SB.2.9-5';
1728             return $seq;
1729         }
1730         $i=0;
1731         foreach ($curtarget as $activ){
1732             $i++;
1733             if ($i != sizeof($curtarget)){
1734                 if ( isset($activ->choiceexit) && ($activ->choiceexit == false)){
1735                     $seq->delivery = null;
1736                     $seq->exception = 'SB.2.9-7';
1737                     return $seq;
1738                 }
1739             }
1740         }
1741         break;
1742     }
1744     if (array_search ($ancestors, $comancestor)!== false){
1745         $ancestorscurrent = scorm_get_ancestors($seq->currentactivity);
1746         $commonpos = scorm_find_common_ancestor($ancestors,$sco);
1747         $curcommon = array_slice($ancestorscurrent,0,$commonpos-1);
1748         if(empty($curcommon)){
1749             $seq->delivery = null;
1750             $seq->exception = 'SB.2.9-5';
1751             return $seq;
1752         }
1754         $constrained = null;
1755         foreach ($curcommon as $acti){
1756             $acti = scorm_get_sco($acti->id);
1757             if ( isset($acti->choiceexit) && ($acti->choiceexit == false)){
1758                     $seq->delivery = null;
1759                     $seq->exception = 'SB.2.9-7';
1760                     return $seq;
1761             }
1762             if ($constrained == null){
1763                 if($acti->constrainchoice == true){
1764                     $constrained = $acti;
1765                 }
1766             }
1767         }
1768         if ($constrained != null){
1769             $fwdir = scorm_get_preorder($constrained);
1771             if(array_search ($fwdir, $sco)!== false){
1772                 $traverse = 'forward';
1773             }
1774             else{
1775                 $traverse = 'backward';
1776             }
1777             $seq = scorm_seq_choice_flow ($constrained, $traverse, $seq);
1778             $actconsider = $seq->identifiedactivity;
1779             $avdescendents = Array();
1780             $avdescendents= scorm_get_available_descendents ($actconsider);
1781             if (array_search ($avdescendents, $sco) !== false && $sco->id != $actconsider->id && $constrained->id != $sco->id ){
1782                 $seq->delivery = null;
1783                 $seq->exception = 'SB.2.9-8';
1784                 return $seq;
1785             }
1787 //CONTINUE 11.5.5
1788         }
1790         $commonpos = scorm_find_common_ancestor($ancestors,$seq->currentactivity);
1791         $comtarget = array_slice($ancestors, 1,$commonpos-1);//path from the common ancestor to the target activity
1792         $comtarget = array_reverse($comtarget);
1794         if (empty($comtarget)){
1795             $seq->delivery = null;
1796             $seq->exception = 'SB.2.9-5';
1797             return $seq;
1798         }
1800         $fwdir = scorm_get_preorder($seq->currentactivity);
1802         if(array_search ($fwdir, $sco)!== false){
1804             foreach ($comtarget as $act){
1805                 $seq = scorm_seq_choice_activity_traversal($act,$userid,$seq,'forward');
1806                 if(!$seq->reachable){
1807                     $seq->delivery = null;
1808                     return $seq;
1809                 }
1810                 $act = scorm_get_sco($act->id);
1811                 if(scorm_seq_is('active',$act->id,$userid) && ($act->id != $comancestor->id && ($act->preventactivation == true))){
1812                     $seq->delivery = null;
1813                     $seq->exception = 'SB.2.9-6';
1814                     return $seq;
1815                 }
1816             }
1818         }
1819         else{
1820             foreach ($comtarget as $act){
1821                 $act = scorm_get_sco($act->id);
1822                 if(scorm_seq_is('active',$act->id,$userid) && ($act->id != $comancestor->id && ($act->preventactivation==true))){
1823                     $seq->delivery = null;
1824                     $seq->exception = 'SB.2.9-6';
1825                     return $seq;
1826                 }
1827             }
1828         }
1829         break;
1830     }
1832     if(scorm_is_leaf ($sco)){
1833         $seq->delivery = $sco;
1834         $seq->exception = 'SB.2.9-6';
1835         return $seq;
1836     }
1838     $seq = scorm_seq_flow ($sco,'forward',$seq,true,$userid);
1839     if ($seq->deliverable == false){
1840         scorm_terminate_descendent_attempts($comancestor,$userid,$seq);
1841         scorm_seq_end_attempt($comancestor,$userid,$seq->attempt);
1842         $seq->currentactivity = $sco;
1843         $seq->delivery = null;
1844         $seq->exception = 'SB.2.9-9';
1845         return $seq;
1847     }
1848     else{
1849         return $seq;
1850     }
1854 function scorm_seq_choice_flow ($constrained, $traverse, $seq){
1855     $seq = scorm_seq_choice_flow_tree ($constrained, $traverse, $seq);
1856     if ($seq->identifiedactivity == null){
1857         $seq->identifiedactivity = $constrained;
1858         return $seq;
1859     }
1860     else{
1861         return $seq;
1862     }
1865 function scorm_seq_choice_flow_tree ($constrained, $traverse, $seq){
1866     $islast = false;
1867     $parent = scorm_get_parent ($constrained);
1868     if ($traverse== 'forward'){
1869         $preord = scorm_get_preorder ($constrained);
1870         if (sizeof($preorder) == 0 || (sizeof($preorder) == 0 && $preorder[0]->id = $constrained->id)){ // TODO: undefined
1871             $islast = true;//the function is the last activity available
1872         }
1873         if ($constrained->parent == '/' || $islast){
1874             $seq->nextactivity = null;
1875             return $seq;
1876         }
1877         $avchildren = scorm_get_available_children ($parent);//available children
1878         if ($avchildren [sizeof($avchildren)-1]->id == $constrained->id){
1879             $seq = scorm_seq_choice_flow_tree ($parent, 'forward', $seq);
1880             return $seq;
1881         }
1882         else{
1883             $i=0;
1884             while($i < sizeof($avchildren)){
1885                 if ($avchildren [$i]->id == $constrained->id){
1886                     $seq->nextactivity = $avchildren [$i+1];
1887                     return $seq;
1888                 }
1889                 else{
1890                     $i++;
1891                 }
1892             }
1893         }
1895     }
1897     if ($traverse== 'backward'){
1898         if($constrained->parent == '/' ){
1899             $seq->nextactivity = null;
1900             return $seq;
1901         }
1903         $avchildren = scorm_get_available_children ($parent);//available children
1904         if ($avchildren [0]->id == $constrained->id){
1905             $seq = scorm_seq_choice_flow_tree ($parent, 'backward', $seq);
1906             return $seq;
1907         }
1908         else{
1909             $i=sizeof($avchildren)-1;
1910             while($i >=0){
1911                 if ($avchildren [$i]->id == $constrained->id){
1912                     $seq->nextactivity = $avchildren [$i-1];
1913                     return $seq;
1914                 }
1915                 else{
1916                     $i--;
1917                 }
1918             }
1919         }
1920     }
1922 function scorm_seq_choice_activity_traversal($activity,$userid,$seq,$direction){
1924     if($direction == 'forward'){
1926         $act = scorm_seq_rules_check($activity,'stopforwardtraversal');
1928         if($act != null){
1929             $seq->reachable = false;
1930             $seq->exception = 'SB.2.4-1';
1931             return $seq;
1932         }
1933         $seq->reachable = false;
1934         return $seq;
1935     }
1937     if($direction == 'backward'){
1938         $parentsco = scorm_get_parent($activity);
1939         if($parentsco!= null){
1940              if (isset($parentsco->forwardonly) && ($parentsco->forwardonly == true)){
1941                  $seq->reachable = false;
1942                  $seq->exception = 'SB.2.4-2';
1943                  return $seq;
1944              }
1945              else{
1946                 $seq->reachable = false;
1947                 $seq->exception = 'SB.2.4-3';
1948                 return $seq;
1949              }
1950         }
1951     }
1952     $seq->reachable = true;
1953     return $seq;
1957 //Delivery Request Process
1959 function scorm_sequencing_delivery($scoid,$userid,$seq){
1961     if(!scorm_is_leaf ($seq->delivery)){
1962         $seq->deliveryvalid = false;
1963         $seq->exception = 'DB.1.1-1';
1964         return $seq;
1965     }
1966     $ancestors = scorm_get_ancestors($seq->delivery);
1967     $arrpath = array_reverse($ancestors);
1968     array_push ($arrpath,$seq->delivery);//path from the root to the target
1970     if (empty($arrpath)){
1971         $seq->deliveryvalid = false;
1972         $seq->exception = 'DB.1.1-2';
1973         return $seq;
1974     }
1976     foreach ($arrpath as $activity){
1977         if(scorm_check_activity ($activity,$userid)){
1978             $seq->deliveryvalid = false;
1979             $seq->exception = 'DB.1.1-3';
1980             return $seq;
1981         }
1982     }
1984     $seq->deliveryvalid = true;
1985     return $seq;
1989 function scorm_content_delivery_environment ($seq,$userid){
1990     global $DB;
1992     $act = $seq->currentactivity;
1993     if(scorm_seq_is('active',$act->id,$userid)){
1994         $seq->exception = 'DB.2-1';
1995         return $seq;
1996     }
1997     $track = $DB->get_record('scorm_scoes_track', array('scoid'=>$act->id,'userid'=>$userid,'element'=>'suspendedactivity'));
1998     if ($track != null){
1999         $seq = scorm_clear_suspended_activity($seq->delivery, $seq);
2001     }
2002     $seq = scorm_terminate_descendent_attempts ($seq->delivery,$userid,$seq);
2003     $ancestors = scorm_get_ancestors($seq->delivery);
2004     $arrpath = array_reverse($ancestors);
2005     array_push ($arrpath,$seq->delivery);
2006     foreach ($arrpath as $activity){
2007         if(!scorm_seq_is('active',$activity->id,$userid)){
2008             if(!isset($activity->tracked) || ($activity->tracked == 1)){
2009                 if(!scorm_seq_is('suspended',$activity->id,$userid)){
2010                     $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityattemptcount'));
2011                     $r->value = ($r->value)+1;
2012                     $DB->update_record ('scorm_scoes_track',$r);
2013                     if ($r->value == 1){
2014                         scorm_seq_set('activityprogressstatus', $activity->id, $userid, 'true');
2015                     }
2016                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectiveprogressstatus', 'false');
2017                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectivesatisfiedstatus', 'false');
2018                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectivemeasurestatus', 'false');
2019                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectivenormalizedmeasure', 0.0);
2021                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptprogressstatus', 'false');
2022                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptcompletionstatus', 'false');
2023                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptabsoluteduration', 0.0);
2024                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptexperiencedduration', 0.0);
2025                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptcompletionamount', 0.0);
2026                 }
2027             }
2028             scorm_seq_set('active', $activity->id, $userid, 'true');
2029         }
2030     }
2031     $seq->delivery = $seq->currentactivity;
2032     scorm_seq_set('suspendedactivity', $activity->id, $userid, 'false');
2034     //ONCE THE DELIVERY BEGINS (How should I check that?)
2036     if(isset($activity->tracked) || ($activity->tracked == 0)){
2037         //How should I track the info and what should I do to not record the information for the activity during delivery?
2038         $atabsdur = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptabsoluteduration'));
2039         $atexpdur = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptexperiencedduration'));
2040     }
2041     return $seq;
2045 function scorm_clear_suspended_activity($act,$seq){
2046     global $DB;
2047     $currentact= $seq->currentactivity;
2048     $track = $DB->get_record('scorm_scoes_track', array('scoid'=>$currentact->id,'userid'=>$userid,'element'=>'suspendedactivity')); // TODO: undefined
2049     if ($track != null){
2050         $ancestors = scorm_get_ancestors($act);
2051         $commonpos = scorm_find_common_ancestor($ancestors,$currentact);
2052         if ($commonpos !== false) {
2053             if ($activitypath = array_slice($ancestors,0,$commonpos)) {
2054                 if (!empty ($activitypath)){
2056                     foreach ($activitypath as $activity) {
2057                         if (scorm_is_leaf($activity)){
2058                             scorm_seq_set('suspended',$activity->id,$userid,false);
2059                         }
2060                         else{
2061                             $children = scorm_get_children($activity);
2062                             $bool= false;
2063                             foreach ($children as $child){
2064                                 if(scorm_seq_is('suspended',$child->id,$userid)){
2065                                     $bool= true;
2066                                 }
2067                             }
2068                              if(!$bool){
2069                                 scorm_seq_set('suspended',$activity->id,$userid,false);
2070                              }
2071                         }
2072                     }
2073                 }
2074             }
2075         }
2076         scorm_seq_set('suspendedactivity',$act->id,$userid,false);
2078     }
2081 function scorm_select_children_process($scoid,$userid){
2082     global $DB;
2084     $sco = scorm_get_sco($scoid);
2085     if (!scorm_is_leaf($sco)){
2086         if(!scorm_seq_is('suspended',$scoid,$userid) && !scorm_seq_is('active',$scoid,$userid)){
2087             $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'selectiontiming'));
2089              switch($r->value) {
2091                 case 'oneachnewattempt':
2092                 case 'never':
2093                 break;
2095                 case 'once':
2096                     if(!scorm_seq_is('activityprogressstatus',$scoid,$userid)){
2097                         if(scorm_seq_is('selectioncountsstatus',$scoid,$userid)){
2098                             $childlist = '';
2099                             $res = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'selectioncount'));
2100                             $i = ($res->value)-1;
2101                             $children = scorm_get_children ($sco);
2103                             while ($i>=0){
2104                                 $pos = array_rand($children);
2105                                 array_push($childlist,$children [$pos]);
2106                                 array_splice($children,$pos,1);
2107                                 $i--;
2108                             }
2109                             sort ($childlist);
2110                             $clist = serialize ($childlist);
2111                             scorm_seq_set('availablechildren', $scoid, $userid, false);
2112                             scorm_seq_set('availablechildren', $scoid, $userid, $clist);
2115                         }
2116                     }
2117                 break;
2119             }
2121         }
2122     }
2125 function scorm_randomize_children_process($scoid,$userid){
2126     global $DB;
2128     $sco = scorm_get_sco($scoid);
2129     if (!scorm_is_leaf($sco)){
2130         if(!scorm_seq_is('suspended',$scoid,$userid) && !scorm_seq_is('active',$scoid,$userid)){
2131             $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'randomizationtiming'));
2133              switch($r->value) {
2136                 case 'never':
2137                 break;
2139                 case 'oneachnewattempt':
2140                 case 'once':
2141                     if(!scorm_seq_is('activityprogressstatus',$scoid,$userid)){
2142                         if(scorm_seq_is('randomizechildren',$scoid,$userid)){
2143                             $childlist = array();
2144                             $res = scorm_get_available_children($sco);
2145                             $i = sizeof($res)-1;
2146                             $children = $res->value;
2148                             while ($i>=0){
2149                                 $pos = array_rand($children);
2150                                 array_push($childlist,$children [$pos]);
2151                                 array_splice($children,$pos,1);
2152                                 $i--;
2153                             }
2155                             $clist = serialize ($childlist);
2156                             scorm_seq_set('availablechildren', $scoid, $userid, false);
2157                             scorm_seq_set('availablechildren', $scoid, $userid, $clist);
2160                         }
2161                     }
2162                 break;
2166             }
2168         }
2169     }
2172 function scorm_terminate_descendent_attempts ($activity,$userid,$seq){
2173     $ancestors = scorm_get_ancestors($seq->currentactivity);
2174     $commonpos = scorm_find_common_ancestor($ancestors,$activity);
2175         if ($commonpos !== false) {
2176             if ($activitypath = array_slice($ancestors,1,$commonpos-2)) {
2177                 if (!empty ($activitypath)){
2179                     foreach ($activitypath as $sco) {
2180                         scorm_seq_end_attempt($sco,$userid,$seq->attempt);
2182                     }
2183                 }
2184             }
2185         }
2188 function scorm_sequencing_exception($seq){
2189     global $OUTPUT;
2190     if($seq->exception != null){
2191         switch($seq->exception){
2193             case 'NB.2.1-1':
2194                 echo $OUTPUT->notification("Sequencing session has already begun");
2195             break;
2196             case 'NB.2.1-2':
2197                 echo $OUTPUT->notification("Sequencing session has not begun");
2198             break;
2199             case 'NB.2.1-3':
2200                 echo $OUTPUT->notification("Suspended activity is not defined");
2201             break;
2202             case 'NB.2.1-4':
2203                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2204             break;
2205             case 'NB.2.1-5':
2206                 echo $OUTPUT->notification("Flow or Forward only Sequencing Control Model Violation");
2207             break;
2208             case 'NB.2.1-6':
2209                 echo $OUTPUT->notification("No activity is previous to the root");
2210             break;
2211             case 'NB.2.1-7':
2212                 echo $OUTPUT->notification("Unsupported Navigation Request");
2213             break;
2214             case 'NB.2.1-8':
2215                 echo $OUTPUT->notification("Choice Exit Sequencing Control Model Violation");
2216             break;
2217             case 'NB.2.1-9':
2218                 echo $OUTPUT->notification("No activities to consider");
2219             break;
2220             case 'NB.2.1-10':
2221                 echo $OUTPUT->notification("Choice Sequencing Control Model Violation");
2222             break;
2223             case 'NB.2.1-11':
2224                 echo $OUTPUT->notification("Target Activity does not exist");
2225             break;
2226             case 'NB.2.1-12':
2227                 echo $OUTPUT->notification("Current Activity already terminated");
2228             break;
2229             case 'NB.2.1-13':
2230                 echo $OUTPUT->notification("Undefined Navigation Request");
2231             break;
2233             case 'TB.2.3-1':
2234                 echo $OUTPUT->notification("Current Activity already terminated");
2235             break;
2236             case 'TB.2.3-2':
2237                 echo $OUTPUT->notification("Current Activity already terminated");
2238             break;
2239             case 'TB.2.3-4':
2240                 echo $OUTPUT->notification("Current Activity already terminated");
2241             break;
2242             case 'TB.2.3-5':
2243                 echo $OUTPUT->notification("Nothing to suspend; No active activities");
2244             break;
2245             case 'TB.2.3-6':
2246                 echo $OUTPUT->notification("Nothing to abandon; No active activities");
2247             break;
2249             case 'SB.2.1-1':
2250                 echo $OUTPUT->notification("Last activity in the tree");
2251             break;
2252             case 'SB.2.1-2':
2253                 echo $OUTPUT->notification("Cluster has no available children");
2254             break;
2255             case 'SB.2.1-3':
2256                 echo $OUTPUT->notification("No activity is previous to the root");
2257             break;
2258             case 'SB.2.1-4':
2259                 echo $OUTPUT->notification("Forward Only Sequencing Control Model Violation");
2260             break;
2262             case 'SB.2.2-1':
2263                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2264             break;
2265             case 'SB.2.2-2':
2266                 echo $OUTPUT->notification("Activity unavailable");
2267             break;
2269             case 'SB.2.3-1':
2270                 echo $OUTPUT->notification("Forward Traversal Blocked");
2271             break;
2272             case 'SB.2.3-2':
2273                 echo $OUTPUT->notification("Forward Only Sequencing Control Model Violation");
2274             break;
2275             case 'SB.2.3-3':
2276                 echo $OUTPUT->notification("No activity is previous to the root");
2277             break;
2279             case 'SB.2.5-1':
2280                 echo $OUTPUT->notification("Sequencing session has already begun");
2281             break;
2283             case 'SB.2.6-1':
2284                 echo $OUTPUT->notification("Sequencing session has already begun");
2285             break;
2286             case 'SB.2.6-2':
2287                 echo $OUTPUT->notification("No Suspended activity is defined");
2288             break;
2290             case 'SB.2.7-1':
2291                 echo $OUTPUT->notification("Sequencing session has not begun");
2292             break;
2293             case 'SB.2.7-2':
2294                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2295             break;
2297             case 'SB.2.8-1':
2298                 echo $OUTPUT->notification("Sequencing session has not begun");
2299             break;
2300             case 'SB.2.8-2':
2301                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2302             break;
2304             case 'SB.2.9-1':
2305                 echo $OUTPUT->notification("No target for Choice");
2306             break;
2307             case 'SB.2.9-2':
2308                 echo $OUTPUT->notification("Target Activity does not exist or is unavailable");
2309             break;
2310             case 'SB.2.9-3':
2311                 echo $OUTPUT->notification("Target Activity hidden from choice");
2312             break;
2313             case 'SB.2.9-4':
2314                 echo $OUTPUT->notification("Choice Sequencing Control Model Violation");
2315             break;
2316             case 'SB.2.9-5':
2317                 echo $OUTPUT->notification("No activities to consider");
2318             break;
2319             case 'SB.2.9-6':
2320                 echo $OUTPUT->notification("Unable to activate target; target is not a child of the Current Activity");
2321             break;
2322             case 'SB.2.9-7':
2323                 echo $OUTPUT->notification("Choice Exit Sequencing Control Model Violation");
2324             break;
2325             case 'SB.2.9-8':
2326                 echo $OUTPUT->notification("Unable to choose target activity - constrained choice");
2327             break;
2328             case 'SB.2.9-9':
2329                 echo $OUTPUT->notification("Choice Request Prevented by Flow-only Activity");
2330             break;
2332             case 'SB.2.10-1':
2333                 echo $OUTPUT->notification("Sequencing session has not begun");
2334             break;
2335             case 'SB.2.10-2':
2336                 echo $OUTPUT->notification("Current Activity is active or suspended");
2337             break;
2338             case 'SB.2.10-3':
2339                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2340             break;
2342             case 'SB.2.11-1':
2343                 echo $OUTPUT->notification("Sequencing session has not begun");
2344             break;
2345             case 'SB.2.11-2':
2346                 echo $OUTPUT->notification("Current Activity has not been terminated");
2347             break;
2349             case 'SB.2.12-2':
2350                 echo $OUTPUT->notification("Undefined Sequencing Request");
2351             break;
2353             case 'DB.1.1-1':
2354                 echo $OUTPUT->notification("Cannot deliver a non-leaf activity");
2355             break;
2356             case 'DB.1.1-2':
2357                 echo $OUTPUT->notification("Nothing to deliver");
2358             break;
2359             case 'DB.1.1-3':
2360                 echo $OUTPUT->notification("Activity unavailable");
2361             break;
2363             case 'DB.2-1':
2364                 echo $OUTPUT->notification("Identified activity is already active");
2365             break;
2367         }
2369     }