function scorm_seq_flow_activity_traversal($activity, $userid, $direction, $childrenflag, $prevdirection, $seq, $userid)
{
$parent = scorm_get_parent($activity);
if (!isset($parent->flow) || $parent->flow == false) {
$seq->deliverable = false;
$seq->exception = 'SB.2.2-1';
$seq->nextactivity = $activity;
return $seq;
}
$rulecheck = scorm_seq_rules_check($activity, 'skip');
if ($rulecheck != null) {
$skip = scorm_evaluate_condition($rulecheck, $activity, $userid);
if ($skip) {
$seq = scorm_seq_flow_tree_traversal($activity, $direction, false, $prevdirection, $seq, $userid, $skip);
$seq = scorm_seq_flow_activity_traversal($seq->nextactivity, $userid, $direction, $childrenflag, $prevdirection, $seq, $userid);
} else {
if (!empty($seq->identifiedactivity)) {
$seq->nextactivity = $activity;
}
}
return $seq;
}
$ch = scorm_check_activity($activity, $userid);
if ($ch) {
$seq->deliverable = false;
$seq->exception = 'SB.2.2-2';
$seq->nextactivity = $activity;
return $seq;
}
if (!scorm_is_leaf($activity)) {
$seq = scorm_seq_flow_tree_traversal($activity, $direction, true, null, $seq, $userid);
if ($seq->identifiedactivity == null) {
$seq->deliverable = false;
$seq->nextactivity = $activity;
return $seq;
} else {
if ($direction == 'backward' && $seq->traversaldir == 'forward') {
$seq = scorm_seq_flow_activity_traversal($seq->identifiedactivity, $userid, 'forward', $childrenflag, 'backward', $seq, $userid);
} else {
$seq = scorm_seq_flow_activity_traversal($seq->identifiedactivity, $userid, $direction, $childrenflag, null, $seq, $userid);
}
return $seq;
}
}
$seq->deliverable = true;
$seq->nextactivity = $activity;
$seq->exception = null;
return $seq;
}
function scorm_sequencing_delivery($scoid, $userid, $seq)
{
if (!scorm_is_leaf($seq->delivery)) {
$seq->deliveryvalid = false;
$seq->exception = 'DB.1.1-1';
return $seq;
}
$ancestors = scorm_get_ancestors($seq->delivery);
$arrpath = array_reverse($ancestors);
array_push($arrpath, $seq->delivery);
//path from the root to the target
if (empty($arrpath)) {
$seq->deliveryvalid = false;
$seq->exception = 'DB.1.1-2';
return $seq;
}
foreach ($arrpath as $activity) {
if (scorm_check_activity($activity, $userid)) {
$seq->deliveryvalid = false;
$seq->exception = 'DB.1.1-3';
return $seq;
}
}
$seq->deliveryvalid = true;
return $seq;
}
