970a2a4ae85d5894b81c64fa821426906cd60fef
[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         //TODO: undefined $sco!
1087              $seq = scorm_seq_start_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1088             $seq->sequencing = true;
1091             break;
1093         case 'resumeall':
1094             $seq = scorm_seq_resume_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1095             $seq->sequencing = true;
1099             break;
1101         case 'exit':
1102              $seq = scorm_seq_exit_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1103             $seq->sequencing = true;
1107             break;
1109         case 'retry':
1110             $seq = scorm_seq_retry_sequencing($sco,$userid,$seq); //We'll see the parameters we have to send, this should update delivery and end
1111             $seq->sequencing = true;
1114             break;
1116         case 'previous':
1117             $seq = scorm_seq_previous_sequencing($sco,$userid,$seq);// We'll see the parameters we have to send, this should update delivery and end
1118             $seq->sequencing = true;
1121             break;
1123         case 'choice':
1124             $seq = scorm_seq_choice_sequencing($sco,$userid,$seq);// We'll see the parameters we have to send, this should update delivery and end
1125              $seq->sequencing = true;
1128             break;
1130     }
1132     if ($seq->exception != null){
1133         $seq->sequencing = false;
1134         return $seq;
1135     }
1137     $seq->sequencing= true;
1138     return $seq;
1142 function scorm_seq_start_sequencing($scoid,$userid,$seq){
1143     global $DB;
1145     if (!empty($seq->currentactivity)) {
1146         $seq->delivery = null;
1147         $seq->exception = 'SB.2.5-1';
1148         return $seq;
1149     }
1150     $sco = $DB->get_record('scorm_scoes', array('scoid'=>$scoid,'userid'=>$userid));
1151     if (($sco->parent == '/') && scorm_is_leaf($sco)) {//if the activity is the root and is leaf
1152         $seq->delivery = $sco;
1153     }
1154     else{
1155         $ancestors = scorm_get_ancestors($sco);
1156         $ancestorsroot = array_reverse($ancestors);
1157         $res = scorm_seq_flow($ancestorsroot[0],'forward',$seq,true,$userid);
1158         if($res){
1159             return $res;
1160         }
1161         else{
1162             //return end and exception
1163         }
1164     }
1167 function scorm_seq_resume_all_sequencing($scoid,$userid,$seq){
1168     global $DB;
1170     if (!empty($seq->currentactivity)){
1171         $seq->delivery = null;
1172         $seq->exception = 'SB.2.6-1';
1173         return $seq;
1174     }
1175     $track = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'suspendedactivity'));
1176     if (!$track) {
1177         $seq->delivery = null;
1178         $seq->exception = 'SB.2.6-2';
1179         return $seq;
1180     }
1181     $seq->delivery = $DB->get_record('scorm_scoes', array('scoid'=>$scoid,'userid'=>$userid));//we assign the sco to the delivery
1185 function scorm_seq_continue_sequencing($scoid,$userid,$seq){
1186     if (empty($seq->currentactivity)) {
1187         $seq->delivery = null;
1188         $seq->exception = 'SB.2.7-1';
1189         return $seq;
1190     }
1191     $currentact= $seq->currentactivity;
1192     if ($currentact->parent != '/') {//if the activity is the root and is leaf
1193         $parent = scorm_get_parent ($currentact);
1195          if (!isset($parent->flow) || ($parent->flow == false)) {
1196             $seq->delivery = null;
1197             $seq->exception = 'SB.2.7-2';
1198             return $seq;
1199         }
1201         $res = scorm_seq_flow($currentact,'forward',$seq,false,$userid);
1202         if($res){
1203             return $res;
1204         }
1205         else{
1206             //return end and exception
1207         }
1209     }
1212 function scorm_seq_previous_sequencing($scoid,$userid,$seq){
1213     if (empty($seq->currentactivity)) {
1214         $seq->delivery = null;
1215         $seq->exception = 'SB.2.8-1';
1216         return $seq;
1217     }
1219     $currentact= $seq->currentactivity;
1220     if ($currentact->parent != '/') {//if the activity is the root and is leaf
1221         $parent = scorm_get_parent ($activity); // TODO: undefined!!
1222         if (!isset($parent->flow) || ($parent->flow == false)) {
1223             $seq->delivery = null;
1224             $seq->exception = 'SB.2.8-2';
1225             return $seq;
1226         }
1228         $res = scorm_seq_flow($currentact,'backward',$seq,false,$userid);
1229         if($res){
1230             return $res;
1231         }
1232         else{
1233             //return end and exception
1234         }
1236     }
1240 function scorm_seq_exit_sequencing($scoid,$userid,$seq){
1241     if (empty($seq->currentactivity)) {
1242         $seq->delivery = null;
1243         $seq->exception = 'SB.2.11-1';
1244         return $seq;
1245     }
1247      if ($seq->active){
1248          $seq->endsession = false;
1249          $seq->exception = 'SB.2.11-2';
1250          return $seq;
1251      }
1252      $currentact= $seq->currentactivity;
1253      if ($currentact->parent == '/'){
1254          $seq->endsession = true;
1255          return $seq;
1256      }
1258     $seq->endsession = false;
1259     return $seq;
1263 function scorm_seq_retry_sequencing($scoid,$userid,$seq){
1264     if (empty($seq->currentactivity)) {
1265         $seq->delivery = null;
1266         $seq->exception = 'SB.2.10-1';
1267         return $seq;
1268     }
1269     if ($seq->active || $seq->suspended){
1270         $seq->delivery = null;
1271         $seq->exception = 'SB.2.10-2';
1272         return $seq;
1273     }
1275     if (!scorm_is_leaf($seq->currentactivity)){
1276         $res = scorm_seq_flow($seq->currentactivity,'forward',$seq,true,$userid);
1277         if($res != null){
1278             return $res;
1279             //return deliver
1280         }
1281         else{
1282             $seq->delivery = null;
1283             $seq->exception = 'SB.2.10-3';
1284             return $seq;
1285         }
1286     }
1287     else{
1288         $seq->delivery = $seq->currentactivity;
1289         return $seq;
1290     }
1294 function scorm_seq_flow ($candidate,$direction,$seq,$childrenflag,$userid){
1295     //$PREVDIRECTION NOT DEFINED YET
1297     $activity=$candidate;
1298     $deliverable=false;
1299     $previdirection = null;
1300     $seq = scorm_seq_flow_tree_traversal ($activity,$direction,$childrenflag,$prevdirection,$seq,$userid); // TODO: undefined
1301     if($seq->identifiedactivity == null){//if identifies
1302         $seq->identifiedactivity = $candidate;
1303         $seq->deliverable = false;
1304         return $seq;
1305     }
1306     else{
1307         $activity = $seq->identifiedactivity;
1308         $seq = scorm_seq_flow_activity_traversal($activity,$userid,$direction,$childrenflag,$prevdirection,$seq,$userid);//
1309         return $seq;
1311     }
1314 function scorm_seq_flow_activity_traversal ($activity, $userid, $direction, $childrenflag, $prevdirection, $seq,$userid){//returns the next activity on the tree, traversal direction, control returned to the LTS, (may) exception
1315     $activity = scorm_get_sco ($activity);
1316     $parent = scorm_get_parent ($activity);
1317    if (!isset($parent->flow) || ($parent->flow == false)) {
1318         $seq->deliverable = false;
1319         $seq->exception = 'SB.2.2-1';
1320         $seq->nextactivity = $activity;
1321         return $seq;
1322     }
1324     $rulch = scorm_seq_rules_check($sco, 'skipped'); // TODO: undefined
1325     if ($rulch != null){
1326         $seq = scorm_seq_flow_tree_traversal ($activity, $direction, false, $prevdirection, $seq,$userid);//endsession and exception
1327         if ($seq->identifiedactivity == null){
1328             $seq->deliverable = false;
1329             $seq->nextactivity = $activity;
1330             return $seq;
1331         }
1332         else{
1334             if ($prevdirection = 'backward' && $seq->traversaldir == 'backward'){
1335                 $seq = scorm_seq_flow_tree_traversal ($activity,$direction,false,null,$seq,$userid);
1336                 $seq = scorm_seq_flow_activity($seq->identifiedactivity, $userid, $direction, $childrenflag, $prevdirection, $seq,$userid);
1337             }
1338             else{
1339                 $seq = scorm_seq_flow_tree_traversal ($activity,$direction,false,null,$seq,$userid);
1340                 $seq = scorm_seq_flow_activity($seq->identifiedactivity, $userid, $direction, $childrenflag, $prevdirection, $seq,$userid);
1341             }
1342             return $seq;
1343         }
1344     }
1346     $ch=scorm_check_activity ($activity,$userid);
1348     if ($ch){
1350         $seq->deliverable = false;
1351         $seq->exception = 'SB.2.2-2';
1352         $seq->nextactivity = $activity;
1353         return $seq;
1355     }
1357     if (!scorm_is_leaf($activity)){
1359         $seq = scorm_seq_flow_tree_traversal ($activity,$direction,true,null,$seq,$userid);
1361         if ($seq->identifiedactivity == null){
1362             $seq->deliverable = false;
1363             $seq->nextactivity = $activity;
1364             return $seq;
1365         }
1367         else{
1368             if($direction == 'backward' && $seq->traversaldir == 'forward'){
1369                 $seq = scorm_seq_flow_activity($seq->identifiedactivity, $userid, 'forward', $childrenflag, 'backward', $seq,$userid);
1370             }
1371             else{
1372                 scorm_seq_flow_activity($seq->identifiedactivity, $userid, $direction, $childrenflag, null, $seq,$userid);
1373             }
1374             return $seq;
1375         }
1377     }
1379     $seq->deliverable = true;
1380     $seq->nextactivity = $activity;
1381     return $seq;
1384 function scorm_seq_flow_tree_traversal ($activity,$direction,$childrenflag,$prevdirection,$seq,$userid){
1386     $revdirection = false;
1387     $parent = scorm_get_parent ($activity);
1388     $children = scorm_get_available_children ($parent);
1389     $siz = sizeof ($children);
1391     if (($prevdirection != null && $prevdirection == 'backward') && ($children[$siz-1]->id == $activity->id)){
1392         $direction = 'backward';
1393         $children[0] = $activity;
1394         $revdirection = true;
1395     }
1397     if($direction = 'forward'){
1398         $ancestors = scorm_get_ancestors($activity);
1399         $ancestorsroot = array_reverse($ancestors);
1400         $preorder = scorm_get_preorder ($ancestorsroot);
1401         $siz= sizeof ($preorder);
1402         if (($activity->id == $preorder[$siz-1]->id) || (($activity->parent == '/') && !($childrenflag))){
1403             scorm_seq_terminate_descent($ancestorsroot,$userid);
1404             $seq->endsession = true;
1405             $seq->nextactivity = null;
1406             return $seq;
1407         }
1408         if (scorm_is_leaf ($activity) || !$childrenflag){
1409             if ($children[$siz-1]->id == $activity->id){
1411                 $seq = scorm_seq_flow_tree_traversal ($parent, $direction, false, null, $seq,$userid);
1412                 // I think it's not necessary to do a return in here
1413             }
1414             else{
1415                 $parent = scorm_get_parent($activity);
1416                 $children = scorm_get_available_children($parent);
1417                 $seq->traversaldir = $direction;
1418                 $sib = scorm_get_siblings($activity);
1419                 $pos = array_search($sib, $activity);
1420                 if ($pos !== false) {
1421                     if ($pos != sizeof ($sib)){
1422                         $seq->nextactivity = $sib [$pos+1];
1423                         return $seq;
1424                     }
1425                     else{
1426                         $ch = scorm_get_children($sib[0]);
1427                         $seq->nextactivity = $ch[0];
1428                         return $seq;
1429                     }
1430                 }
1431             }
1432         }
1433         else{
1434             if (!empty ($children)){
1435                 $seq->traversaldir = $direction;
1436                 $seq->nextactivity = $children[0];
1437                 return $seq;
1438             }
1439             else{
1440                 $seq->traversaldir = null;
1441                 $seq->nextactivity = $children[0];
1442                 $seq->exception = 'SB.2.1-2';
1443                 return $seq;
1444             }
1445         }
1447     }
1448     if($direction = 'backward'){
1450          if ($activity->parent == '/'){
1451             $seq->traversaldir = null;
1452             $seq->nextactivity = null;
1453             $seq->exception = 'SB.2.1-3';
1454             return $seq;
1455          }
1456          if (scorm_is_leaf ($activity) || !$childrenflag){
1457              if (!$revdirection){
1458                  if (isset($parent->forwardonly) && ($parent->forwardonly == true)) {
1459                      $seq->traversaldir = null;
1460                      $seq->nextactivity = null;
1461                      $seq->exception = 'SB.2.1-4';
1462                      return $seq;
1463                  }
1464              }
1465              if ($children[0]->id == $activity->id){
1466                 $seq = scorm_seq_flow_tree_traversal ($parent, 'backward', false, null, $seq);
1467                 return $seq;
1468              }
1469              else{
1470                 $ancestors = scorm_get_ancestors($activity);
1471                 $ancestorsroot = array_reverse ($ancestors);
1472                 $preorder = scorm_get_preorder ($ancestorsroot);
1473                 $pos = array_search($preorder, $children[$siz]);
1474                 $preord = array_slice($preorder, 0, $pos-1);
1475                 $revpreorder = array_reverse($preord);
1476                 $position = array_search($revpreorder, $activity);
1477                 $seq->nextactivity = $revpreorder[$pos+1];
1478                 $seq->traversaldir = $direction;
1479                 return $seq;
1480              }
1481          }
1482          else{
1483              if (!empty($children)){
1484                  $activity = scorm_get_sco($activity->id);
1485                  if (isset($parent->flow) && ($parent->flow == true)) {
1486                      $children = scorm_get_children ($activity);
1487                      $seq->traversaldir = 'forward';
1488                      $seq->nextactivity = $children[0];
1489                      return $seq;
1491                  }
1492                  else{
1493                      $children = scorm_get_children ($activity);
1494                      $seq->traversaldir = 'backward';
1495                      $seq->nextactivity = $children[sizeof($children)-1];
1496                      return $seq;
1497                  }
1499              }
1500              else{
1502                      $seq->traversaldir = null;
1503                      $seq->nextactivity = null;
1504                      $seq->exception = 'SB.2.1-2';
1505                      return $seq;
1506              }
1507          }
1509     }
1513 function scorm_check_activity ($activity,$userid){
1514     $act = scorm_seq_rules_check($activity,'disabled');
1515     if ($act != null){
1516         return true;
1517     }
1518     if(scorm_limit_cond_check ($activity,$userid)){
1519         return true;
1520     }
1521     return false;
1526 function scorm_limit_cond_check ($activity,$userid){
1527     global $DB;
1529     if (isset($activity->tracked) && ($activity->tracked == 0)){
1531         return false;
1532     }
1534     if (scorm_seq_is('active',$activity->id,$userid) || scorm_seq_is('suspended',$activity->id,$userid)){
1535         return false;
1536     }
1538     if (!isset($activity->limitcontrol) || ($activity->limitcontrol == 1)){
1539         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityattemptcount'));
1540         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitattempt)){
1541             return true;
1542         }
1543     }
1545      if (!isset($activity->limitabsdurcontrol) || ($activity->limitabsdurcontrol == 1)){
1546         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityabsoluteduration'));
1547         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitabsduration)){
1548             return true;
1549         }
1550     }
1552     if (!isset($activity->limitexpdurcontrol) || ($activity->limitexpdurcontrol == 1)){
1553         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityexperiencedduration'));
1554         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitexpduration)){
1555             return true;
1556         }
1557     }
1559      if (!isset($activity->limitattabsdurcontrol) || ($activity->limitattabsdurcontrol == 1)){
1560         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptabsoluteduration'));
1561         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitattabsduration)){
1562             return true;
1563         }
1564     }
1566     if (!isset($activity->limitattexpdurcontrol) || ($activity->limitattexpdurcontrol == 1)){
1567         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptexperiencedduration'));
1568         if (scorm_seq_is('activityprogressstatus',$activity->id,$userid) && ($r->value >=$activity->limitattexpduration)){
1569             return true;
1570         }
1571     }
1573     if (!isset($activity->limitbegincontrol) || ($activity->limitbegincontrol == 1)){
1574         $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'begintime'));
1575         if (time()>=$activity->limitbegintime){
1576             return true;
1577         }
1578     }
1580     if (!isset($activity->limitbegincontrol) || ($activity->limitbegincontrol == 1)){
1581         if (time()<$activity->limitbegintime){
1582             return true;
1583         }
1584     }
1586     if (!isset($activity->limitendcontrol) || ($activity->limitendcontrol == 1)){
1588         if (time()>$activity->limitendtime){
1589             return true;
1590         }
1591     }
1592     return false;
1598 function scorm_seq_choice_sequencing($sco,$userid,$seq){
1600     $avchildren = Array ();
1601     $comancestor = null;
1602     $traverse = null;
1604     if ($sco == null){
1605         $seq->delivery = null;
1606         $seq->exception = 'SB.2.9-1';
1607         return $seq;
1608     }
1610     $ancestors = scorm_get_ancestors($sco);
1611     $arrpath = array_reverse($ancestors);
1612     array_push ($arrpath,$sco);//path from the root to the target
1614     foreach ($arrpath as $activity){
1616         if ($activity->parent != '/') {
1617             $avchildren = scorm_get_available_children (scorm_get_parent($activity));
1618             $position = array_search($avchildren, $activity);
1619             if ($position !== false){
1620                 $seq->delivery = null;
1621                 $seq->exception = 'SB.2.9-2';
1622                 return $seq;
1623             }
1624         }
1626         if (scorm_seq_rules_check($activity,'hidefromchoice' != null)){
1628             $seq->delivery = null;
1629             $seq->exception = 'SB.2.9-3';
1630             return $seq;
1632         }
1634     }
1636     if ($sco->parent != '/') {
1637         $parent = scorm_sco_get_parent ($sco);
1638         if ( isset($parent->choice) && ($parent->choice == false)){
1639             $seq->delivery = null;
1640             $seq->exception = 'SB.2.9-4';
1641             return $seq;
1642         }
1643     }
1645     if ($seq->currentactivity != null){
1646         $commonpos = scorm_find_common_ancestor($ancestors,$seq->currentactivity);
1647         $comancestor = $arrpath [$commonpos];
1648     }
1649     else{
1650         $comancestor = $arrpath [0];
1651     }
1653     if($seq->currentactivity === $sco) {
1654         break;
1655     }
1657     $sib = scorm_get_siblings($seq->currentactivity);
1658     $pos = array_search($sib, $sco);
1660     if ($pos !== false){
1662         $siblings = array_slice($sib, 0, $pos-1);
1664         if (empty($siblings)){
1666             $seq->delivery = null;
1667             $seq->exception = 'SB.2.9-5';
1668             return $seq;
1670         }
1672         $children = scorm_get_children (scorm_get_parent ($sco));
1673         $pos1 = array_search($children, $sco);
1674         $pos2 = array_search($seq->currentactivity, $sco);
1675         if ($pos1>$pos2){
1676             $traverse = 'forward';
1677         }
1678         else{
1679             $traverse = 'backward';
1680         }
1682         foreach ($siblings as $sibling){
1683             $seq = scorm_seq_choice_activity_traversal($sibling,$userid,$seq,$traverse);
1684             if(!$seq->reachable){
1685                 $seq->delivery = null;
1686                 return $seq;
1687             }
1688         }
1689         break;
1691     }
1693     if($seq->currentactivity == null || $seq->currentactivity == $comancestor){
1694         $commonpos = scorm_find_common_ancestor($ancestors,$seq->currentactivity);
1695         $comtarget = array_slice($ancestors, 1,$commonpos-1);//path from the common ancestor to the target activity
1696         $comtarget = array_reverse($comtarget);
1698         if (empty($comtarget)){
1699             $seq->delivery = null;
1700             $seq->exception = 'SB.2.9-5';
1701             return $seq;
1702         }
1703         foreach ($comtarget as $act){
1704             $seq = scorm_seq_choice_activity_traversal($act,$userid,$seq,'forward');
1705             if(!$seq->reachable){
1706                 $seq->delivery = null;
1707                 return $seq;
1708             }
1709             $act = scorm_get_sco ($acti->id);
1710             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?
1711                 $seq->delivery = null;
1712                 $seq->exception = 'SB.2.9-6';
1713                 return $seq;
1714             }
1715         }
1716         break;
1718     }
1720     if ($comancestor->id == $sco->id){
1722         $ancestorscurrent = scorm_get_ancestors($seq->currentactivity);
1723         $possco = array_search ($ancestorscurrent, $sco);
1724         $curtarget = array_slice($ancestorscurrent,0,$possco);//path from the current activity to the target
1726         if (empty($curtarget)){
1727             $seq->delivery = null;
1728             $seq->exception = 'SB.2.9-5';
1729             return $seq;
1730         }
1731         $i=0;
1732         foreach ($curtarget as $activ){
1733             $i++;
1734             if ($i != sizeof($curtarget)){
1735                 if ( isset($activ->choiceexit) && ($activ->choiceexit == false)){
1736                     $seq->delivery = null;
1737                     $seq->exception = 'SB.2.9-7';
1738                     return $seq;
1739                 }
1740             }
1741         }
1742         break;
1743     }
1745     if (array_search ($ancestors, $comancestor)!== false){
1746         $ancestorscurrent = scorm_get_ancestors($seq->currentactivity);
1747         $commonpos = scorm_find_common_ancestor($ancestors,$sco);
1748         $curcommon = array_slice($ancestorscurrent,0,$commonpos-1);
1749         if(empty($curcommon)){
1750             $seq->delivery = null;
1751             $seq->exception = 'SB.2.9-5';
1752             return $seq;
1753         }
1755         $constrained = null;
1756         foreach ($curcommon as $acti){
1757             $acti = scorm_get_sco($acti->id);
1758             if ( isset($acti->choiceexit) && ($acti->choiceexit == false)){
1759                     $seq->delivery = null;
1760                     $seq->exception = 'SB.2.9-7';
1761                     return $seq;
1762             }
1763             if ($constrained == null){
1764                 if($acti->constrainchoice == true){
1765                     $constrained = $acti;
1766                 }
1767             }
1768         }
1769         if ($constrained != null){
1770             $fwdir = scorm_get_preorder($constrained);
1772             if(array_search ($fwdir, $sco)!== false){
1773                 $traverse = 'forward';
1774             }
1775             else{
1776                 $traverse = 'backward';
1777             }
1778             $seq = scorm_seq_choice_flow ($constrained, $traverse, $seq);
1779             $actconsider = $seq->identifiedactivity;
1780             $avdescendents = Array();
1781             $avdescendents= scorm_get_available_descendents ($actconsider);
1782             if (array_search ($avdescendents, $sco) !== false && $sco->id != $actconsider->id && $constrained->id != $sco->id ){
1783                 $seq->delivery = null;
1784                 $seq->exception = 'SB.2.9-8';
1785                 return $seq;
1786             }
1788 //CONTINUE 11.5.5
1789         }
1791         $commonpos = scorm_find_common_ancestor($ancestors,$seq->currentactivity);
1792         $comtarget = array_slice($ancestors, 1,$commonpos-1);//path from the common ancestor to the target activity
1793         $comtarget = array_reverse($comtarget);
1795         if (empty($comtarget)){
1796             $seq->delivery = null;
1797             $seq->exception = 'SB.2.9-5';
1798             return $seq;
1799         }
1801         $fwdir = scorm_get_preorder($seq->currentactivity);
1803         if(array_search ($fwdir, $sco)!== false){
1805             foreach ($comtarget as $act){
1806                 $seq = scorm_seq_choice_activity_traversal($act,$userid,$seq,'forward');
1807                 if(!$seq->reachable){
1808                     $seq->delivery = null;
1809                     return $seq;
1810                 }
1811                 $act = scorm_get_sco($act->id);
1812                 if(scorm_seq_is('active',$act->id,$userid) && ($act->id != $comancestor->id && ($act->preventactivation == true))){
1813                     $seq->delivery = null;
1814                     $seq->exception = 'SB.2.9-6';
1815                     return $seq;
1816                 }
1817             }
1819         }
1820         else{
1821             foreach ($comtarget as $act){
1822                 $act = scorm_get_sco($act->id);
1823                 if(scorm_seq_is('active',$act->id,$userid) && ($act->id != $comancestor->id && ($act->preventactivation==true))){
1824                     $seq->delivery = null;
1825                     $seq->exception = 'SB.2.9-6';
1826                     return $seq;
1827                 }
1828             }
1829         }
1830         break;
1831     }
1833     if(scorm_is_leaf ($sco)){
1834         $seq->delivery = $sco;
1835         $seq->exception = 'SB.2.9-6';
1836         return $seq;
1837     }
1839     $seq = scorm_seq_flow ($sco,'forward',$seq,true,$userid);
1840     if ($seq->deliverable == false){
1841         scorm_terminate_descendent_attempts($comancestor,$userid,$seq);
1842         scorm_seq_end_attempt($comancestor,$userid,$seq->attempt);
1843         $seq->currentactivity = $sco;
1844         $seq->delivery = null;
1845         $seq->exception = 'SB.2.9-9';
1846         return $seq;
1848     }
1849     else{
1850         return $seq;
1851     }
1855 function scorm_seq_choice_flow ($constrained, $traverse, $seq){
1856     $seq = scorm_seq_choice_flow_tree ($constrained, $traverse, $seq);
1857     if ($seq->identifiedactivity == null){
1858         $seq->identifiedactivity = $constrained;
1859         return $seq;
1860     }
1861     else{
1862         return $seq;
1863     }
1866 function scorm_seq_choice_flow_tree ($constrained, $traverse, $seq){
1867     $islast = false;
1868     $parent = scorm_get_parent ($constrained);
1869     if ($traverse== 'forward'){
1870         $preord = scorm_get_preorder ($constrained);
1871         if (sizeof($preorder) == 0 || (sizeof($preorder) == 0 && $preorder[0]->id = $constrained->id)){ // TODO: undefined
1872             $islast = true;//the function is the last activity available
1873         }
1874         if ($constrained->parent == '/' || $islast){
1875             $seq->nextactivity = null;
1876             return $seq;
1877         }
1878         $avchildren = scorm_get_available_children ($parent);//available children
1879         if ($avchildren [sizeof($avchildren)-1]->id == $constrained->id){
1880             $seq = scorm_seq_choice_flow_tree ($parent, 'forward', $seq);
1881             return $seq;
1882         }
1883         else{
1884             $i=0;
1885             while($i < sizeof($avchildren)){
1886                 if ($avchildren [$i]->id == $constrained->id){
1887                     $seq->nextactivity = $avchildren [$i+1];
1888                     return $seq;
1889                 }
1890                 else{
1891                     $i++;
1892                 }
1893             }
1894         }
1896     }
1898     if ($traverse== 'backward'){
1899         if($constrained->parent == '/' ){
1900             $seq->nextactivity = null;
1901             return $seq;
1902         }
1904         $avchildren = scorm_get_available_children ($parent);//available children
1905         if ($avchildren [0]->id == $constrained->id){
1906             $seq = scorm_seq_choice_flow_tree ($parent, 'backward', $seq);
1907             return $seq;
1908         }
1909         else{
1910             $i=sizeof($avchildren)-1;
1911             while($i >=0){
1912                 if ($avchildren [$i]->id == $constrained->id){
1913                     $seq->nextactivity = $avchildren [$i-1];
1914                     return $seq;
1915                 }
1916                 else{
1917                     $i--;
1918                 }
1919             }
1920         }
1921     }
1923 function scorm_seq_choice_activity_traversal($activity,$userid,$seq,$direction){
1925     if($direction == 'forward'){
1927         $act = scorm_seq_rules_check($activity,'stopforwardtraversal');
1929         if($act != null){
1930             $seq->reachable = false;
1931             $seq->exception = 'SB.2.4-1';
1932             return $seq;
1933         }
1934         $seq->reachable = false;
1935         return $seq;
1936     }
1938     if($direction == 'backward'){
1939         $parentsco = scorm_get_parent($activity);
1940         if($parentsco!= null){
1941              if (isset($parentsco->forwardonly) && ($parentsco->forwardonly == true)){
1942                  $seq->reachable = false;
1943                  $seq->exception = 'SB.2.4-2';
1944                  return $seq;
1945              }
1946              else{
1947                 $seq->reachable = false;
1948                 $seq->exception = 'SB.2.4-3';
1949                 return $seq;
1950              }
1951         }
1952     }
1953     $seq->reachable = true;
1954     return $seq;
1958 //Delivery Request Process
1960 function scorm_sequencing_delivery($scoid,$userid,$seq){
1962     if(!scorm_is_leaf ($seq->delivery)){
1963         $seq->deliveryvalid = false;
1964         $seq->exception = 'DB.1.1-1';
1965         return $seq;
1966     }
1967     $ancestors = scorm_get_ancestors($seq->delivery);
1968     $arrpath = array_reverse($ancestors);
1969     array_push ($arrpath,$seq->delivery);//path from the root to the target
1971     if (empty($arrpath)){
1972         $seq->deliveryvalid = false;
1973         $seq->exception = 'DB.1.1-2';
1974         return $seq;
1975     }
1977     foreach ($arrpath as $activity){
1978         if(scorm_check_activity ($activity,$userid)){
1979             $seq->deliveryvalid = false;
1980             $seq->exception = 'DB.1.1-3';
1981             return $seq;
1982         }
1983     }
1985     $seq->deliveryvalid = true;
1986     return $seq;
1990 function scorm_content_delivery_environment ($seq,$userid){
1991     global $DB;
1993     $act = $seq->currentactivity;
1994     if(scorm_seq_is('active',$act->id,$userid)){
1995         $seq->exception = 'DB.2-1';
1996         return $seq;
1997     }
1998     $track = $DB->get_record('scorm_scoes_track', array('scoid'=>$act->id,'userid'=>$userid,'element'=>'suspendedactivity'));
1999     if ($track != null){
2000         $seq = scorm_clear_suspended_activity($seq->delivery, $seq);
2002     }
2003     $seq = scorm_terminate_descendent_attempts ($seq->delivery,$userid,$seq);
2004     $ancestors = scorm_get_ancestors($seq->delivery);
2005     $arrpath = array_reverse($ancestors);
2006     array_push ($arrpath,$seq->delivery);
2007     foreach ($arrpath as $activity){
2008         if(!scorm_seq_is('active',$activity->id,$userid)){
2009             if(!isset($activity->tracked) || ($activity->tracked == 1)){
2010                 if(!scorm_seq_is('suspended',$activity->id,$userid)){
2011                     $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'activityattemptcount'));
2012                     $r->value = ($r->value)+1;
2013                     $DB->update_record ('scorm_scoes_track',$r);
2014                     if ($r->value == 1){
2015                         scorm_seq_set('activityprogressstatus', $activity->id, $userid, 'true');
2016                     }
2017                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectiveprogressstatus', 'false');
2018                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectivesatisfiedstatus', 'false');
2019                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectivemeasurestatus', 'false');
2020                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'objectivenormalizedmeasure', 0.0);
2022                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptprogressstatus', 'false');
2023                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptcompletionstatus', 'false');
2024                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptabsoluteduration', 0.0);
2025                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptexperiencedduration', 0.0);
2026                     scorm_insert_track($userid, $activity->scorm, $activity->id, 0, 'attemptcompletionamount', 0.0);
2027                 }
2028             }
2029             scorm_seq_set('active', $activity->id, $userid, 'true');
2030         }
2031     }
2032     $seq->delivery = $seq->currentactivity;
2033     scorm_seq_set('suspendedactivity', $activity->id, $userid, 'false');
2035     //ONCE THE DELIVERY BEGINS (How should I check that?)
2037     if(isset($activity->tracked) || ($activity->tracked == 0)){
2038         //How should I track the info and what should I do to not record the information for the activity during delivery?
2039         $atabsdur = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptabsoluteduration'));
2040         $atexpdur = $DB->get_record('scorm_scoes_track', array('scoid'=>$activity->id,'userid'=>$userid,'element'=>'attemptexperiencedduration'));
2041     }
2042     return $seq;
2046 function scorm_clear_suspended_activity($act,$seq){
2047     global $DB;
2048     $currentact= $seq->currentactivity;
2049     $track = $DB->get_record('scorm_scoes_track', array('scoid'=>$currentact->id,'userid'=>$userid,'element'=>'suspendedactivity')); // TODO: undefined
2050     if ($track != null){
2051         $ancestors = scorm_get_ancestors($act);
2052         $commonpos = scorm_find_common_ancestor($ancestors,$currentact);
2053         if ($commonpos !== false) {
2054             if ($activitypath = array_slice($ancestors,0,$commonpos)) {
2055                 if (!empty ($activitypath)){
2057                     foreach ($activitypath as $activity) {
2058                         if (scorm_is_leaf($activity)){
2059                             scorm_seq_set('suspended',$activity->id,$userid,false);
2060                         }
2061                         else{
2062                             $children = scorm_get_children($activity);
2063                             $bool= false;
2064                             foreach ($children as $child){
2065                                 if(scorm_seq_is('suspended',$child->id,$userid)){
2066                                     $bool= true;
2067                                 }
2068                             }
2069                              if(!$bool){
2070                                 scorm_seq_set('suspended',$activity->id,$userid,false);
2071                              }
2072                         }
2073                     }
2074                 }
2075             }
2076         }
2077         scorm_seq_set('suspendedactivity',$act->id,$userid,false);
2079     }
2082 function scorm_select_children_process($scoid,$userid){
2083     global $DB;
2085     $sco = scorm_get_sco($scoid);
2086     if (!scorm_is_leaf($sco)){
2087         if(!scorm_seq_is('suspended',$scoid,$userid) && !scorm_seq_is('active',$scoid,$userid)){
2088             $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'selectiontiming'));
2090              switch($r->value) {
2092                 case 'oneachnewattempt':
2093                 case 'never':
2094                 break;
2096                 case 'once':
2097                     if(!scorm_seq_is('activityprogressstatus',$scoid,$userid)){
2098                         if(scorm_seq_is('selectioncountsstatus',$scoid,$userid)){
2099                             $childlist = '';
2100                             $res = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'selectioncount'));
2101                             $i = ($res->value)-1;
2102                             $children = scorm_get_children ($sco);
2104                             while ($i>=0){
2105                                 $pos = array_rand($children);
2106                                 array_push($childlist,$children [$pos]);
2107                                 array_splice($children,$pos,1);
2108                                 $i--;
2109                             }
2110                             sort ($childlist);
2111                             $clist = serialize ($childlist);
2112                             scorm_seq_set('availablechildren', $scoid, $userid, false);
2113                             scorm_seq_set('availablechildren', $scoid, $userid, $clist);
2116                         }
2117                     }
2118                 break;
2120             }
2122         }
2123     }
2126 function scorm_randomize_children_process($scoid,$userid){
2127     global $DB;
2129     $sco = scorm_get_sco($scoid);
2130     if (!scorm_is_leaf($sco)){
2131         if(!scorm_seq_is('suspended',$scoid,$userid) && !scorm_seq_is('active',$scoid,$userid)){
2132             $r = $DB->get_record('scorm_scoes_track', array('scoid'=>$scoid,'userid'=>$userid,'element'=>'randomizationtiming'));
2134              switch($r->value) {
2137                 case 'never':
2138                 break;
2140                 case 'oneachnewattempt':
2141                 case 'once':
2142                     if(!scorm_seq_is('activityprogressstatus',$scoid,$userid)){
2143                         if(scorm_seq_is('randomizechildren',$scoid,$userid)){
2144                             $childlist = array();
2145                             $res = scorm_get_available_children($sco);
2146                             $i = sizeof($res)-1;
2147                             $children = $res->value;
2149                             while ($i>=0){
2150                                 $pos = array_rand($children);
2151                                 array_push($childlist,$children [$pos]);
2152                                 array_splice($children,$pos,1);
2153                                 $i--;
2154                             }
2156                             $clist = serialize ($childlist);
2157                             scorm_seq_set('availablechildren', $scoid, $userid, false);
2158                             scorm_seq_set('availablechildren', $scoid, $userid, $clist);
2161                         }
2162                     }
2163                 break;
2167             }
2169         }
2170     }
2173 function scorm_terminate_descendent_attempts ($activity,$userid,$seq){
2174     $ancestors = scorm_get_ancestors($seq->currentactivity);
2175     $commonpos = scorm_find_common_ancestor($ancestors,$activity);
2176         if ($commonpos !== false) {
2177             if ($activitypath = array_slice($ancestors,1,$commonpos-2)) {
2178                 if (!empty ($activitypath)){
2180                     foreach ($activitypath as $sco) {
2181                         scorm_seq_end_attempt($sco,$userid,$seq->attempt);
2183                     }
2184                 }
2185             }
2186         }
2189 function scorm_sequencing_exception($seq){
2190     global $OUTPUT;
2191     if($seq->exception != null){
2192         switch($seq->exception){
2194             case 'NB.2.1-1':
2195                 echo $OUTPUT->notification("Sequencing session has already begun");
2196             break;
2197             case 'NB.2.1-2':
2198                 echo $OUTPUT->notification("Sequencing session has not begun");
2199             break;
2200             case 'NB.2.1-3':
2201                 echo $OUTPUT->notification("Suspended activity is not defined");
2202             break;
2203             case 'NB.2.1-4':
2204                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2205             break;
2206             case 'NB.2.1-5':
2207                 echo $OUTPUT->notification("Flow or Forward only Sequencing Control Model Violation");
2208             break;
2209             case 'NB.2.1-6':
2210                 echo $OUTPUT->notification("No activity is previous to the root");
2211             break;
2212             case 'NB.2.1-7':
2213                 echo $OUTPUT->notification("Unsupported Navigation Request");
2214             break;
2215             case 'NB.2.1-8':
2216                 echo $OUTPUT->notification("Choice Exit Sequencing Control Model Violation");
2217             break;
2218             case 'NB.2.1-9':
2219                 echo $OUTPUT->notification("No activities to consider");
2220             break;
2221             case 'NB.2.1-10':
2222                 echo $OUTPUT->notification("Choice Sequencing Control Model Violation");
2223             break;
2224             case 'NB.2.1-11':
2225                 echo $OUTPUT->notification("Target Activity does not exist");
2226             break;
2227             case 'NB.2.1-12':
2228                 echo $OUTPUT->notification("Current Activity already terminated");
2229             break;
2230             case 'NB.2.1-13':
2231                 echo $OUTPUT->notification("Undefined Navigation Request");
2232             break;
2234             case 'TB.2.3-1':
2235                 echo $OUTPUT->notification("Current Activity already terminated");
2236             break;
2237             case 'TB.2.3-2':
2238                 echo $OUTPUT->notification("Current Activity already terminated");
2239             break;
2240             case 'TB.2.3-4':
2241                 echo $OUTPUT->notification("Current Activity already terminated");
2242             break;
2243             case 'TB.2.3-5':
2244                 echo $OUTPUT->notification("Nothing to suspend; No active activities");
2245             break;
2246             case 'TB.2.3-6':
2247                 echo $OUTPUT->notification("Nothing to abandon; No active activities");
2248             break;
2250             case 'SB.2.1-1':
2251                 echo $OUTPUT->notification("Last activity in the tree");
2252             break;
2253             case 'SB.2.1-2':
2254                 echo $OUTPUT->notification("Cluster has no available children");
2255             break;
2256             case 'SB.2.1-3':
2257                 echo $OUTPUT->notification("No activity is previous to the root");
2258             break;
2259             case 'SB.2.1-4':
2260                 echo $OUTPUT->notification("Forward Only Sequencing Control Model Violation");
2261             break;
2263             case 'SB.2.2-1':
2264                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2265             break;
2266             case 'SB.2.2-2':
2267                 echo $OUTPUT->notification("Activity unavailable");
2268             break;
2270             case 'SB.2.3-1':
2271                 echo $OUTPUT->notification("Forward Traversal Blocked");
2272             break;
2273             case 'SB.2.3-2':
2274                 echo $OUTPUT->notification("Forward Only Sequencing Control Model Violation");
2275             break;
2276             case 'SB.2.3-3':
2277                 echo $OUTPUT->notification("No activity is previous to the root");
2278             break;
2280             case 'SB.2.5-1':
2281                 echo $OUTPUT->notification("Sequencing session has already begun");
2282             break;
2284             case 'SB.2.6-1':
2285                 echo $OUTPUT->notification("Sequencing session has already begun");
2286             break;
2287             case 'SB.2.6-2':
2288                 echo $OUTPUT->notification("No Suspended activity is defined");
2289             break;
2291             case 'SB.2.7-1':
2292                 echo $OUTPUT->notification("Sequencing session has not begun");
2293             break;
2294             case 'SB.2.7-2':
2295                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2296             break;
2298             case 'SB.2.8-1':
2299                 echo $OUTPUT->notification("Sequencing session has not begun");
2300             break;
2301             case 'SB.2.8-2':
2302                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2303             break;
2305             case 'SB.2.9-1':
2306                 echo $OUTPUT->notification("No target for Choice");
2307             break;
2308             case 'SB.2.9-2':
2309                 echo $OUTPUT->notification("Target Activity does not exist or is unavailable");
2310             break;
2311             case 'SB.2.9-3':
2312                 echo $OUTPUT->notification("Target Activity hidden from choice");
2313             break;
2314             case 'SB.2.9-4':
2315                 echo $OUTPUT->notification("Choice Sequencing Control Model Violation");
2316             break;
2317             case 'SB.2.9-5':
2318                 echo $OUTPUT->notification("No activities to consider");
2319             break;
2320             case 'SB.2.9-6':
2321                 echo $OUTPUT->notification("Unable to activate target; target is not a child of the Current Activity");
2322             break;
2323             case 'SB.2.9-7':
2324                 echo $OUTPUT->notification("Choice Exit Sequencing Control Model Violation");
2325             break;
2326             case 'SB.2.9-8':
2327                 echo $OUTPUT->notification("Unable to choose target activity - constrained choice");
2328             break;
2329             case 'SB.2.9-9':
2330                 echo $OUTPUT->notification("Choice Request Prevented by Flow-only Activity");
2331             break;
2333             case 'SB.2.10-1':
2334                 echo $OUTPUT->notification("Sequencing session has not begun");
2335             break;
2336             case 'SB.2.10-2':
2337                 echo $OUTPUT->notification("Current Activity is active or suspended");
2338             break;
2339             case 'SB.2.10-3':
2340                 echo $OUTPUT->notification("Flow Sequencing Control Model Violation");
2341             break;
2343             case 'SB.2.11-1':
2344                 echo $OUTPUT->notification("Sequencing session has not begun");
2345             break;
2346             case 'SB.2.11-2':
2347                 echo $OUTPUT->notification("Current Activity has not been terminated");
2348             break;
2350             case 'SB.2.12-2':
2351                 echo $OUTPUT->notification("Undefined Sequencing Request");
2352             break;
2354             case 'DB.1.1-1':
2355                 echo $OUTPUT->notification("Cannot deliver a non-leaf activity");
2356             break;
2357             case 'DB.1.1-2':
2358                 echo $OUTPUT->notification("Nothing to deliver");
2359             break;
2360             case 'DB.1.1-3':
2361                 echo $OUTPUT->notification("Activity unavailable");
2362             break;
2364             case 'DB.2-1':
2365                 echo $OUTPUT->notification("Identified activity is already active");
2366             break;
2368         }
2370     }