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348 lines
15 KiB
PHP
348 lines
15 KiB
PHP
<?php // $Id$
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/**
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* This is really a little language parser for AICC_SCRIPT
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* evaluates the expression and returns a boolean answer
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* see 2.3.2.5.1. Sequencing/Navigation Today - from the SCORM 1.2 spec (CAM).
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*
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* @param string $prerequisites the aicc_script prerequisites expression
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* @param array $usertracks the tracked user data of each SCO visited
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* @return boolean
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*/
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function scorm_eval_prerequisites($prerequisites, $usertracks) {
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// this is really a little language parser - AICC_SCRIPT is the reference
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// see 2.3.2.5.1. Sequencing/Navigation Today - from the SCORM 1.2 spec
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$element = '';
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$stack = array();
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$statuses = array(
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'passed' => 'passed',
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'completed' => 'completed',
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'failed' => 'failed',
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'incomplete' => 'incomplete',
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'browsed' => 'browsed',
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'not attempted' => 'notattempted',
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'p' => 'passed',
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'c' => 'completed',
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'f' => 'failed',
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'i' => 'incomplete',
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'b' => 'browsed',
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'n' => 'notattempted'
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);
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$i=0;
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// expand the amp entities
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$prerequisites = preg_replace('/&/', '&', $prerequisites);
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// find all my parsable tokens
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$prerequisites = preg_replace('/(&|\||\(|\)|\~)/', '\t$1\t', $prerequisites);
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// expand operators
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$prerequisites = preg_replace('/&/', '&&', $prerequisites);
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$prerequisites = preg_replace('/\|/', '||', $prerequisites);
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// now - grab all the tokens
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$elements = explode('\t', trim($prerequisites));
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// process each token to build an expression to be evaluated
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$stack = array();
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foreach ($elements as $element) {
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$element = trim($element);
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if (empty($element)) {
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continue;
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}
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if (!preg_match('/^(&&|\|\||\(|\))$/', $element)) {
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// create each individual expression
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// search for ~ = <> X*{}
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// sets like 3*{S34, S36, S37, S39}
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if (preg_match('/^(\d+)\*\{(.+)\}$/', $element, $matches)) {
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$repeat = $matches[1];
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$set = explode(',', $matches[2]);
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$count = 0;
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foreach ($set as $setelement) {
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if (isset($usertracks[$setelement]) &&
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($usertracks[$setelement]->status == 'completed' || $usertracks[$element]->status == 'passed')) {
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$count++;
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}
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}
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if ($count >= $repeat) {
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$element = 'true';
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} else {
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$element = 'false';
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}
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// ~ Not
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} else if ($element == '~') {
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$element = '!';
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// = | <>
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} else if (preg_match('/^(.+)(\=|\<\>)(.+)$/', $element, $matches)) {
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$element = trim($matches[1]);
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if (isset($usertracks[$element])) {
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$value = trim(preg_replace('/(\'|\")/', '', $matches[3]));
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if (isset($statuses[$value])) {
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$value = $statuses[$value];
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}
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if ($matches[2] == '<>') {
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$oper = '!=';
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} else {
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$oper = '==';
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}
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$element = '(\''.$usertracks[$element]->status.'\' '.$oper.' \''.$value.'\')';
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} else {
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$element = 'false';
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}
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// everything else must be an element defined like S45 ...
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} else {
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if (isset($usertracks[$element]) &&
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($usertracks[$element]->status == 'completed' || $usertracks[$element]->status == 'passed')) {
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$element = 'true';
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} else {
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$element = 'false';
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}
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}
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}
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$stack []= ' '.$element.' ';
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}
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return eval('return '.implode($stack).';');
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}
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function scorm_get_toc($user,$scorm,$liststyle,$currentorg='',$scoid='',$mode='normal',$attempt='',$play=false) {
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global $CFG, $DB;
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$strexpand = get_string('expcoll','scorm');
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$modestr = '';
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if ($mode == 'browse') {
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$modestr = '&mode='.$mode;
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}
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$scormpixdir = $CFG->modpixpath.'/scorm/pix';
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$result = new stdClass();
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$result->toc = "<ul id='s0' class='$liststyle'>\n";
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$tocmenus = array();
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$result->prerequisites = true;
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$incomplete = false;
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//
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// Get the current organization infos
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//
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if (!empty($currentorg)) {
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if (($organizationtitle = $DB->get_field('scorm_scoes','title', array('scorm'=>$scorm->id,'identifier'=>$currentorg))) != '') {
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$result->toc .= "\t<li>$organizationtitle</li>\n";
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$tocmenus[] = $organizationtitle;
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}
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}
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//
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// If not specified retrieve the last attempt number
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//
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if (empty($attempt)) {
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$attempt = scorm_get_last_attempt($scorm->id, $user->id);
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}
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$result->attemptleft = $scorm->maxattempt - $attempt;
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$conditions['scorm'] = $scorm->id;
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if ($scoes = scorm_get_scoes($scorm->id, $currentorg)){
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//
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// Retrieve user tracking data for each learning object
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//
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$usertracks = array();
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foreach ($scoes as $sco) {
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if (!empty($sco->launch)) {
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if ($usertrack = scorm_get_tracks($sco->id,$user->id,$attempt)) {
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if ($usertrack->status == '') {
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$usertrack->status = 'notattempted';
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}
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$usertracks[$sco->identifier] = $usertrack;
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}
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}
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}
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$level=0;
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$sublist=1;
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$previd = 0;
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$nextid = 0;
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$findnext = false;
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$parents[$level]='/';
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foreach ($scoes as $pos => $sco) {
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$isvisible = false;
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$sco->title = $sco->title;
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if (!isset($sco->isvisible) || (isset($sco->isvisible) && ($sco->isvisible == 'true'))) {
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$isvisible = true;
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}
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if ($parents[$level] != $sco->parent) {
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if ($newlevel = array_search($sco->parent,$parents)) {
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for ($i=0; $i<($level-$newlevel); $i++) {
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$result->toc .= "\t\t</ul></li>\n";
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}
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$level = $newlevel;
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} else {
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$i = $level;
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$closelist = '';
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while (($i > 0) && ($parents[$level] != $sco->parent)) {
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$closelist .= "\t\t</ul></li>\n";
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$i--;
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}
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if (($i == 0) && ($sco->parent != $currentorg)) {
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$style = '';
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if (isset($_COOKIE['hide:SCORMitem'.$sco->id])) {
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$style = ' style="display: none;"';
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}
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$result->toc .= "\t\t<li><ul id='s$sublist' class='$liststyle'$style>\n";
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$level++;
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} else {
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$result->toc .= $closelist;
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$level = $i;
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}
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$parents[$level] = $sco->parent;
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}
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}
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if ($isvisible) {
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$result->toc .= "\t\t<li>";
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}
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if (isset($scoes[$pos+1])) {
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$nextsco = $scoes[$pos+1];
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} else {
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$nextsco = false;
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}
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$nextisvisible = false;
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if (($nextsco !== false) && (!isset($nextsco->isvisible) || (isset($nextsco->isvisible) && ($nextsco->isvisible == 'true')))) {
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$nextisvisible = true;
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}
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if ($nextisvisible && ($nextsco !== false) && ($sco->parent != $nextsco->parent) && (($level==0) || (($level>0) && ($nextsco->parent == $sco->identifier)))) {
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$sublist++;
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$icon = 'minus';
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if (isset($_COOKIE['hide:SCORMitem'.$nextsco->id])) {
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$icon = 'plus';
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}
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$result->toc .= '<a href="javascript:expandCollide(\'img'.$sublist.'\',\'s'.$sublist.'\','.$nextsco->id.');"><img id="img'.$sublist.'" src="'.$scormpixdir.'/'.$icon.'.gif" alt="'.$strexpand.'" title="'.$strexpand.'"/></a>';
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} else if ($isvisible) {
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$result->toc .= '<img src="'.$scormpixdir.'/spacer.gif" />';
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}
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if (empty($sco->title)) {
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$sco->title = $sco->identifier;
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}
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if (!empty($sco->launch)) {
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if ($isvisible) {
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$startbold = '';
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$endbold = '';
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$score = '';
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if (empty($scoid) && ($mode != 'normal')) {
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$scoid = $sco->id;
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}
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if (isset($usertracks[$sco->identifier])) {
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$usertrack = $usertracks[$sco->identifier];
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$strstatus = get_string($usertrack->status,'scorm');
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if ($sco->scormtype == 'sco') {
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$statusicon = '<img src="'.$scormpixdir.'/'.$usertrack->status.'.gif" alt="'.$strstatus.'" title="'.$strstatus.'" />';
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} else {
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$statusicon = '<img src="'.$scormpixdir.'/assetc.gif" alt="'.get_string('assetlaunched','scorm').'" title="'.get_string('assetlaunched','scorm').'" />';
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}
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if (($usertrack->status == 'notattempted') || ($usertrack->status == 'incomplete') || ($usertrack->status == 'browsed')) {
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$incomplete = true;
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if ($play && empty($scoid)) {
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$scoid = $sco->id;
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}
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}
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if ($usertrack->score_raw != '') {
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$score = '('.get_string('score','scorm').': '.$usertrack->score_raw.')';
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}
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$strsuspended = get_string('suspended','scorm');
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if (isset($usertrack->{'cmi.core.exit'}) && ($usertrack->{'cmi.core.exit'} == 'suspend')) {
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if($usertrack->status !='completed') {
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$statusicon = '<img src="'.$scormpixdir.'/suspend.gif" alt="'.$strstatus.' - '.$strsuspended.'" title="'.$strstatus.' - '.$strsuspended.'" />';
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}
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}
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} else {
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if ($play && empty($scoid)) {
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$scoid = $sco->id;
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}
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$incomplete = true;
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if ($sco->scormtype == 'sco') {
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$statusicon = '<img src="'.$scormpixdir.'/notattempted.gif" alt="'.get_string('notattempted','scorm').'" title="'.get_string('notattempted','scorm').'" />';
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} else {
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$statusicon = '<img src="'.$scormpixdir.'/asset.gif" alt="'.get_string('asset','scorm').'" title="'.get_string('asset','scorm').'" />';
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}
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}
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if ($sco->id == $scoid) {
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$startbold = '<b>';
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$endbold = '</b>';
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$findnext = true;
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$shownext = isset($sco->next) ? $sco->next : 0;
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$showprev = isset($sco->previous) ? $sco->previous : 0;
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}
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if (($nextid == 0) && (scorm_count_launchable($scorm->id,$currentorg) > 1) && ($nextsco!==false) && (!$findnext)) {
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if (!empty($sco->launch)) {
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$previd = $sco->id;
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}
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}
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if (empty($sco->prerequisites) || scorm_eval_prerequisites($sco->prerequisites,$usertracks)) {
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if ($sco->id == $scoid) {
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$result->prerequisites = true;
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}
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$url = $CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&currentorg='.$currentorg.$modestr.'&scoid='.$sco->id;
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$result->toc .= $statusicon.' '.$startbold.'<a href="'.$url.'">'.format_string($sco->title).'</a>'.$score.$endbold."</li>\n";
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$tocmenus[$sco->id] = scorm_repeater('−',$level) . '>' . format_string($sco->title);
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} else {
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if ($sco->id == $scoid) {
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$result->prerequisites = false;
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}
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$result->toc .= $statusicon.' '.format_string($sco->title)."</li>\n";
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}
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}
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} else {
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$result->toc .= ' '.format_string($sco->title)."</li>\n";
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}
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if (($nextsco !== false) && ($nextid == 0) && ($findnext)) {
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if (!empty($nextsco->launch)) {
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$nextid = $nextsco->id;
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}
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}
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}
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for ($i=0;$i<$level;$i++) {
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$result->toc .= "\t\t</ul></li>\n";
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}
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if ($play) {
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// it is possible that scoid is still not set, in this case we dont want an empty object
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if ($scoid) {
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$sco = scorm_get_sco($scoid);
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}
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$sco->previd = $previd;
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$sco->nextid = $nextid;
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$result->sco = $sco;
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$result->incomplete = $incomplete;
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} else {
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$result->incomplete = $incomplete;
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}
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}
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$result->toc .= "\t</ul>\n";
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if ($scorm->hidetoc == 0) {
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$result->toc .= '
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<script type="text/javascript">
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//<![CDATA[
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function expandCollide(which,list,item) {
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var el = document.ids ? document.ids[list] : document.getElementById ? document.getElementById(list) : document.all[list];
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which = which.substring(0,(which.length));
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var el2 = document.ids ? document.ids[which] : document.getElementById ? document.getElementById(which) : document.all[which];
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if (el.style.display != "none") {
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el2.src = "'.$scormpixdir.'/plus.gif";
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el.style.display=\'none\';
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new cookie("hide:SCORMitem" + item, 1, 356, "/").set();
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} else {
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el2.src = "'.$scormpixdir.'/minus.gif";
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el.style.display=\'block\';
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new cookie("hide:SCORMitem" + item, 1, -1, "/").set();
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}
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}
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//]]>
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</script>'."\n";
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}
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$url = $CFG->wwwroot.'/mod/scorm/player.php?a='.$scorm->id.'&currentorg='.$currentorg.$modestr.'&scoid=';
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$result->tocmenu = popup_form($url,$tocmenus, "tocmenu", $sco->id, '', '', '', true);
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return $result;
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}
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?>
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