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<?php // $Id$
function scorm_eval_prerequisites($prerequisites,$usertracks) {
$element = '';
$stack = array();
$statuses = array(
'passed' => 'passed',
'completed' => 'completed',
'failed' => 'failed',
'incomplete' => 'incomplete',
'browsed' => 'browsed',
'not attempted' => 'notattempted',
'p' => 'passed',
'c' => 'completed',
'f' => 'failed',
'i' => 'incomplete',
'b' => 'browsed',
'n' => 'notattempted'
);
$i=0;
while ($i<strlen($prerequisites)) {
$symbol = $prerequisites[$i];
switch ($symbol) {
case '&':
case '|':
$symbol .= $symbol;
case '~':
case '(':
case ')':
case '*':
$element = trim($element);
if (!empty($element)) {
$element = trim($element);
if (isset($usertracks[$element])) {
$element = '((\''.$usertracks[$element]->status.'\' == \'completed\') || '.
'(\''.$usertracks[$element]->status.'\' == \'passed\'))';
} else if (($operator = strpos($element,'=')) !== false) {
$item = trim(substr($element,0,$operator));
if (!isset($usertracks[$item])) {
return false;
}
$value = trim(trim(substr($element,$operator+1)),'"');
if (isset($statuses[$value])) {
$status = $statuses[$value];
} else {
return false;
}
$element = '(\''.$usertracks[$item]->status.'\' == \''.$status.'\')';
} else if (($operator = strpos($element,'<>')) !== false) {
$item = trim(substr($element,0,$operator));
if (!isset($usertracks[$item])) {
return false;
}
$value = trim(trim(substr($element,$operator+2)),'"');
if (isset($statuses[$value])) {
$status = $statuses[$value];
} else {
return false;
}
$element = '(\''.$usertracks[$item]->status.'\' != \''.$status.'\')';
} else if (is_numeric($element)) {
if ($symbol == '*') {
$symbol = '';
$open = strpos($prerequisites,'{',$i);
$opened = 1;
$closed = 0;
for ($close=$open+1; (($opened > $closed) && ($close<strlen($prerequisites))); $close++) {
if ($prerequisites[$close] == '}') {
$closed++;
} else if ($prerequisites[$close] == '{') {
$opened++;
}
}
$i = $close;
$setelements = explode(',', substr($prerequisites, $open+1, $close-($open+1)-1));
$settrue = 0;
foreach ($setelements as $setelement) {
if (scorm_eval_prerequisites($setelement,$usertracks)) {
$settrue++;
}
}
if ($settrue >= $element) {
$element = 'true';
} else {
$element = 'false';
}
}
} else {
return false;
}
array_push($stack,$element);
$element = '';
}
if ($symbol == '~') {
$symbol = '!';
}
if (!empty($symbol)) {
array_push($stack,$symbol);
}
break;
default:
$element .= $symbol;
break;
}
$i++;
}
if (!empty($element)) {
$element = trim($element);
if (isset($usertracks[$element])) {
$element = '((\''.$usertracks[$element]->status.'\' == \'completed\') || '.
'(\''.$usertracks[$element]->status.'\' == \'passed\'))';
} else if (($operator = strpos($element,'=')) !== false) {
$item = trim(substr($element,0,$operator));
if (!isset($usertracks[$item])) {
return false;
}
$value = trim(trim(substr($element,$operator+1)),'"');
if (isset($statuses[$value])) {
$status = $statuses[$value];
} else {
return false;
}
$element = '(\''.$usertracks[$item]->status.'\' == \''.$status.'\')';
} else if (($operator = strpos($element,'<>')) !== false) {
$item = trim(substr($element,0,$operator));
if (!isset($usertracks[$item])) {
return false;
}
$value = trim(trim(substr($element,$operator+1)),'"');
if (isset($statuses[$value])) {
$status = $statuses[$value];
} else {
return false;
}
$element = '(\''.$usertracks[$item]->status.'\' != \''.trim($status).'\')';
} else {
return false;
}
array_push($stack,$element);
}
return eval('return '.implode($stack).';');
}
function scorm_get_toc($user,$scorm,$liststyle,$currentorg='',$scoid='',$mode='normal',$attempt='',$play=false) {
global $CFG;
$strexpand = get_string('expcoll','scorm');
$modestr = '';
if ($mode == 'browse') {
$modestr = '&amp;mode='.$mode;
}
$scormpixdir = $CFG->modpixpath.'/scorm/pix';
$result = new stdClass();
$result->toc = "<ul id='0' class='$liststyle'>\n";
$tocmenus = array();
$result->prerequisites = true;
$incomplete = false;
//
// Get the current organization infos
//
$organizationsql = '';
if (!empty($currentorg)) {
if (($organizationtitle = get_field('scorm_scoes','title','scorm',$scorm->id,'identifier',$currentorg)) != '') {
$result->toc .= "\t<li>$organizationtitle</li>\n";
$tocmenus[] = $organizationtitle;
}
$organizationsql = "AND organization='$currentorg'";
}
//
// If not specified retrieve the last attempt number
//
if (empty($attempt)) {
$attempt = scorm_get_last_attempt($scorm->id, $user->id);
}
$result->attemptleft = $scorm->maxattempt - $attempt;
if ($scoes = get_records_select('scorm_scoes',"scorm='$scorm->id' $organizationsql order by id ASC")){
//
// Retrieve user tracking data for each learning object
//
$usertracks = array();
foreach ($scoes as $sco) {
if (!empty($sco->launch)) {
if ($usertrack=scorm_get_tracks($sco->id,$user->id,$attempt)) {
if ($usertrack->status == '') {
$usertrack->status = 'notattempted';
}
$usertracks[$sco->identifier] = $usertrack;
}
}
}
$level=0;
$sublist=1;
$previd = 0;
$nextid = 0;
$findnext = false;
$parents[$level]='/';
foreach ($scoes as $sco) {
$isvisible = false;
if ($optionaldatas = scorm_get_sco($sco->id, SCO_DATA)) {
if (!isset($optionaldatas->isvisible) || (isset($optionaldatas->isvisible) && ($optionaldatas->isvisible == 'true'))) {
$isvisible = true;
}
}
else
$isvisible = true;
if ($parents[$level]!=$sco->parent) {
if ($newlevel = array_search($sco->parent,$parents)) {
for ($i=0; $i<($level-$newlevel); $i++) {
$result->toc .= "\t\t</ul></li>\n";
}
$level = $newlevel;
} else {
$i = $level;
$closelist = '';
while (($i > 0) && ($parents[$level] != $sco->parent)) {
$closelist .= "\t\t</ul></li>\n";
$i--;
}
if (($i == 0) && ($sco->parent != $currentorg)) {
$style = '';
if (isset($_COOKIE['hide:SCORMitem'.$sco->id])) {
$style = ' style="display: none;"';
}
$result->toc .= "\t\t<li><ul id='$sublist' class='$liststyle'$style>\n";
$level++;
} else {
$result->toc .= $closelist;
$level = $i;
}
$parents[$level]=$sco->parent;
}
}
if ($isvisible) {
$result->toc .= "\t\t<li>";
}
$nextsco = next($scoes);
$nextisvisible = false;
if (($nextsco !== false) && ($optionaldatas = scorm_get_sco($nextsco->id, SCO_DATA))) {
if (!isset($optionaldatas->isvisible) || (isset($optionaldatas->isvisible) && ($optionaldatas->isvisible == 'true'))) {
$nextisvisible = true;
}
}
if ($nextisvisible && ($nextsco !== false) && ($sco->parent != $nextsco->parent) && (($level==0) || (($level>0) && ($nextsco->parent == $sco->identifier)))) {
$sublist++;
$icon = 'minus';
if (isset($_COOKIE['hide:SCORMitem'.$nextsco->id])) {
$icon = 'plus';
}
$result->toc .= $result->toc .= '<a href="javascript:expandCollide(\'img'.$sublist.'\','.$sublist.','.$nextsco->id.');"><img id="img'.$sublist.'" src="'.$scormpixdir.'/'.$icon.'.gif" alt="'.$strexpand.'" title="'.$strexpand.'"/></a>';
} else if ($isvisible) {
$result->toc .= '<img src="'.$scormpixdir.'/spacer.gif" />';
}
if (empty($sco->title)) {
$sco->title = $sco->identifier;
}
if (!empty($sco->launch)) {
if ($isvisible) {
$startbold = '';
$endbold = '';
$score = '';
if (empty($scoid) && ($mode != 'normal')) {
$scoid = $sco->id;
}
if (isset($usertracks[$sco->identifier])) {
$usertrack = $usertracks[$sco->identifier];
$strstatus = get_string($usertrack->status,'scorm');
if ($sco->scormtype == 'sco') {
$statusicon = '<img src="'.$scormpixdir.'/'.$usertrack->status.'.gif" alt="'.$strstatus.'" title="'.$strstatus.'" />';
} else {
$statusicon = '<img src="'.$scormpixdir.'/assetc.gif" alt="'.get_string('assetlaunched','scorm').'" title="'.get_string('assetlaunched','scorm').'" />';
}
if (($usertrack->status == 'notattempted') || ($usertrack->status == 'incomplete') || ($usertrack->status == 'browsed')) {
$incomplete = true;
if ($play && empty($scoid)) {
$scoid = $sco->id;
}
}
if ($usertrack->score_raw != '') {
$score = '('.get_string('score','scorm').':&nbsp;'.$usertrack->score_raw.')';
}
$strsuspended = get_string('suspended','scorm');
if (isset($usertrack->{'cmi.core.exit'}) && ($usertrack->{'cmi.core.exit'} == 'suspend')) {
$statusicon = '<img src="'.$scormpixdir.'/suspend.gif" alt="'.$strstatus.' - '.$strsuspended.'" title="'.$strstatus.' - '.$strsuspended.'" />';
}
} else {
if ($play && empty($scoid)) {
$scoid = $sco->id;
}
$incomplete = true;
if ($sco->scormtype == 'sco') {
$statusicon = '<img src="'.$scormpixdir.'/notattempted.gif" alt="'.get_string('notattempted','scorm').'" title="'.get_string('notattempted','scorm').'" />';
} else {
$statusicon = '<img src="'.$scormpixdir.'/asset.gif" alt="'.get_string('asset','scorm').'" title="'.get_string('asset','scorm').'" />';
}
}
if ($sco->id == $scoid) {
$scodata = scorm_get_sco($sco->id, SCO_DATA);
$startbold = '<b>';
$endbold = '</b>';
$findnext = true;
$shownext = isset($scodata->next) ? $scodata->next : 0;
$showprev = isset($scodata->previous) ? $scodata->previous : 0;
}
if (($nextid == 0) && (scorm_count_launchable($scorm->id,$currentorg) > 1) && ($nextsco!==false) && (!$findnext)) {
if (!empty($sco->launch)) {
$previd = $sco->id;
}
}
if (empty($sco->prerequisites) || scorm_eval_prerequisites($sco->prerequisites,$usertracks)) {
if ($sco->id == $scoid) {
$result->prerequisites = true;
}
$url = $CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&amp;currentorg='.$currentorg.$modestr.'&amp;scoid='.$sco->id;
$result->toc .= $statusicon.'&nbsp;'.$startbold.'<a href="'.$url.'">'.format_string($sco->title).'</a>'.$score.$endbold."</li>\n";
$tocmenus[$sco->id] = scorm_repeater('&minus;',$level) . '&gt;' . format_string($sco->title);
} else {
if ($sco->id == $scoid) {
$result->prerequisites = false;
}
$result->toc .= $statusicon.'&nbsp;'.$sco->title."</li>\n";
}
}
} else {
$result->toc .= '&nbsp;'.$sco->title."</li>\n";
}
if (($nextsco !== false) && ($nextid == 0) && ($findnext)) {
if (!empty($nextsco->launch)) {
$nextid = $nextsco->id;
}
}
}
for ($i=0;$i<$level;$i++) {
$result->toc .= "\t\t</ul></li>\n";
}
if ($play) {
$sco = scorm_get_sco($scoid);
$sco->previd = $previd;
$sco->nextid = $nextid;
$result->sco = $sco;
$result->incomplete = $incomplete;
} else {
$result->incomplete = $incomplete;
}
}
$result->toc .= "\t</ul>\n";
if ($scorm->hidetoc == 0) {
$result->toc .= '
<script type="text/javascript">
//<![CDATA[
function expandCollide(which,list,item) {
var nn=document.ids?true:false
var w3c=document.getElementById?true:false
var beg=nn?"document.ids.":w3c?"document.getElementById(":"document.all.";
var mid=w3c?").style":".style";
which = which.substring(0,(which.length));
if (eval(beg+list+mid+".display") != "none") {
document.getElementById(which).src = "'.$scormpixdir.'/plus.gif";
eval(beg+list+mid+".display=\'none\';");
new cookie("hide:SCORMitem" + item, 1, 356, "/").set();
} else {
document.getElementById(which).src = "'.$scormpixdir.'/minus.gif";
eval(beg+list+mid+".display=\'block\';");
new cookie("hide:SCORMitem" + item, 1, -1, "/").set();
}
}
//]]>
</script>'."\n";
}
$url = $CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&amp;currentorg='.$currentorg.$modestr.'&amp;scoid=';
$result->tocmenu = popup_form($url,$tocmenus, "tocmenu", $sco->id, '', '', '', true);
return $result;
}
?>
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