mods/_core/imsqti/classes/QTIParser.class.php

   1 <?php
   2 /****************************************************************/
   3 /* ATutor                                                                                                               */
   4 /****************************************************************/
   5 /* Copyright (c) 2002-2009                                                                              */
   6 /* Inclusive Design Institute                                   */
   7 /* http://atutor.ca                                                                                             */
   8 /*                                                              */
   9 /* This program is free software. You can redistribute it and/or*/
  10 /* modify it under the terms of the GNU General Public License  */
  11 /* as published by the Free Software Foundation.                                */
  12 /****************************************************************/
  13 // $Id$
  14
  15 //Constances
  16 define('AT_QTI_REPONSE_GRP',    1);
  17 define('AT_QTI_REPONSE_LID',    2);
  18 define('AT_QTI_REPONSE_STR',    3);
  19
  20 /**
  21 * QTIParser
  22 * Class for parsing XML language info and returning a QTI Object
  23 * @access       public
  24 * @author       Harris Wong
  25 */
  26 class QTIParser {
  27         // all private
  28         var $parser; // the XML handler
  29         var $qti_type; // QTI specification versoin, imsqti_xmlv1p1, imsqti_item_xmlv2p1, imsqti_xmlv1p2
  30         var $character_data; // tmp variable for storing the data
  31         var $element_path; // array of element paths (basically a stack)
  32         var $title;     //title for this question test
  33         var $q_identifiers      = array();              //The identifier of the choice. This identifier must not be used by any other choice or item variable.
  34         var $question = '';                                     //question of this QTI
  35         var $response_type      = array();              //detects what type of question this would be.
  36         var $relative_path      = '';                   //the relative path to all resources in this xml.
  37
  38         //stacks
  39         var $choices            = array();      //answers array that keep tracks of all the correct answers
  40         var $groups                     = array();      //groups for matching, the left handside to match with the different choices
  41         var $attributes         = array();      //tag attribute
  42         var $answers            = array();      //correct answers
  43         var $response_label = array();  //temporary holders for response labels
  44         var $field_label        = array();              //fields label
  45         var $field_entry        = array();      //fields entry
  46         var $feedback           = array();              //question feedback
  47         var $item_num           = 0;            //item number
  48         var $items                      = array();      //stacks of media items, ie. img, embed, ahref etc.
  49         var $qmd_itemtype       = -1;           //qmd flag
  50         var $temp_answer        = array();      //store the temp answer stack
  51         var $answers_for_matching       = array();
  52         var $weights            = array();      //the weight of each question
  53
  54         //constructor
  55         function QTIParser($qti_type='') {
  56                 $this->qti_type = $qti_type;
  57                 $this->parser = xml_parser_create();
  58
  59                 xml_set_object($this->parser, $this);
  60                 xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false); /* conform to W3C specs */
  61                 xml_set_element_handler($this->parser, 'startElement', 'endElement');
  62                 xml_set_character_data_handler($this->parser, 'characterData');
  63         }
  64
  65         // public
  66         // @return      true if parsed successfully, false otherwise
  67         function parse($xml_data) {
  68                 $this->element_path   = array();
  69                 $this->character_data = '';
  70                 xml_parse($this->parser, $xml_data, TRUE);
  71
  72                 //Loop thru each item and replace if existed
  73                 foreach ($this->answers_for_matching as $afm_k => $afk_v){
  74                         if (!empty($this->answers_for_matching[$afm_k])){
  75                                 $this->answers[$afm_k] = $afk_v;
  76                         }
  77                 }
  78
  79                 if(in_array('questestinterop', $this->element_path) ||
  80                         in_array('assessment', $this->element_path)){
  81                         //this is a v2.1+ package
  82                         return false;
  83                 } else {
  84                         return true;
  85                 }
  86         }
  87
  88         // private
  89         function startElement($parser, $name, $attributes) {
  90                 global $msg;
  91 //              debug($attributes, $name );
  92                 //save attributes.
  93                 switch($name) {
  94                         case 'section':
  95                                 $this->title = $attributes['title'];
  96                                 break;
  97                         case 'response_lid':
  98                                 if ($this->response_type[$this->item_num] <= 0) {
  99                                         $this->response_type[$this->item_num] = AT_QTI_REPONSE_LID;
 100                                 }
 101                         case 'response_grp':
 102                                 if ($this->response_type[$this->item_num] <= 0) {
 103                                         $this->response_type[$this->item_num] = AT_QTI_REPONSE_GRP;
 104                                 }
 105                         case 'response_str':
 106                                 $this->attributes[$this->item_num][$name]['ident'] = $attributes['ident'];
 107                                 $this->attributes[$this->item_num][$name]['rcardinality'] = $attributes['rcardinality'];
 108                                 if ($this->response_type[$this->item_num] <= 0) {
 109                                         $this->response_type[$this->item_num] = AT_QTI_REPONSE_STR;
 110                                 }
 111                                 break;
 112                         case 'response_label':
 113                                         if(!isset($this->choices[$this->item_num][$attributes['ident']])){
 114                                                 if (!is_array($this->response_label[$this->item_num])){
 115                                                         $this->response_label[$this->item_num] = array();
 116                                                 }
 117                                                 array_push($this->response_label[$this->item_num], $attributes['ident']);
 118                                         }
 119                                 break;
 120                         case 'varequal':
 121                                 $this->attributes[$this->item_num][$name]['respident'] = $attributes['respident'];
 122                                 break;
 123                         case 'setvar':
 124                                 $this->attributes[$this->item_num][$name]['varname'] = $attributes['varname'];
 125                                 break;
 126                         case 'render_choice':
 127                                 $this->attributes[$this->item_num][$name]['shuffle'] = $attributes['shuffle'];
 128                                 $this->attributes[$this->item_num][$name]['minnumber'] = $attributes['minnumber'];
 129                                 $this->attributes[$this->item_num][$name]['maxnumber'] = $attributes['maxnumber'];
 130                                 break;
 131                         case 'render_fib':
 132                                 $rows = intval($attributes['rows']);
 133                                 $property = 1;
 134
 135                                 //1,2,3,4 according to tools/tests/create_question_long.php
 136                                 if ($rows == 1){
 137                                         $property = 2;
 138                                 } elseif ($rows > 1 && $rows <= 5){
 139                                         $property = 3;
 140                                 } elseif ($rows > 5){
 141                                         $property = 4;
 142                                 }
 143                                 $this->attributes[$this->item_num][$name]['property'] = $property;
 144                                 break;
 145                         case 'matimage':
 146                                 $this->attributes[$this->item_num][$name]['imagtype'] = $attributes['imagtype'];
 147                                 $this->attributes[$this->item_num][$name]['uri'] = $attributes['uri'];
 148                                 break;
 149                         case 'mataudio':
 150                                 $this->attributes[$this->item_num][$name]['audiotype'] = $attributes['audiotype'];
 151                                 $this->attributes[$this->item_num][$name]['uri'] = $attributes['uri'];
 152                                 break;
 153                         case 'matvideo':
 154                                 $this->attributes[$this->item_num][$name]['videotype'] = $attributes['videotype'];
 155                                 $this->attributes[$this->item_num][$name]['uri'] = $attributes['uri'];
 156                                 break;
 157                         case 'matapplet':
 158                                 $this->attributes[$this->item_num][$name]['uri'] = $attributes['uri'];
 159                                 $this->attributes[$this->item_num][$name]['width'] = intval($attributes['width']);
 160                                 $this->attributes[$this->item_num][$name]['height'] = intval($attributes['height']);
 161                                 break;
 162                         case 'setvar':
 163                                 $this->attributes[$this->item_num][$name]['varname'] = $attributes['varname'];
 164                                 $this->attributes[$this->item_num][$name]['action'] = $attributes['action'];
 165                                 break;
 166                         case 'itemproc_extension':
 167                                 if (preg_match('/imsqti_xmlv1p2\/imscc_xmlv1p0(.*)/', $this->qti_type)){
 168                                         $msg->addError('QTI_WRONG_PACKAGE');
 169                                 }
 170                                 break;
 171                 }
 172                 array_push($this->element_path, $name);
 173    }
 174
 175         // private
 176         /* called when an element ends */
 177         /* removed the current element from the $path */
 178         function endElement($parser, $name) {
 179                 global $msg;
 180                 //check element path
 181                 $current_pos = count($this->element_path) - 1;
 182                 $last_element = $this->element_path[$current_pos - 1];
 183
 184                 switch($name) {
 185                         case 'item':
 186                                 $this->item_num++;
 187                                 break;
 188                         case 'mattext':
 189                                 $this->mat_content[$this->item_num] .= $this->reconstructRelativePath($this->character_data);
 190                                 break;
 191                         case 'matimage':
 192                                 $this->mat_content[$this->item_num] .= '<img src="'.$this->attributes[$this->item_num][$name]['uri'].'" alt="Image Not loaded:'.$this->attributes[$this->item_num][$name]['uri'].'" />';
 193                                 break;
 194                         case 'mataudio':
 195                                 $this->mat_content[$this->item_num] .= '<embed SRC="'.$this->attributes[$this->item_num][$name]['uri'].'" autostart="false" width="145" height="60"><noembed><bgsound src="'.$this->attributes[$this->item_num][$name]['uri'].'"></noembed></embed>';
 196                                 break;
 197                         case 'matvideo':
 198                                 if ($this->attributes[$this->item_num][$name]['videotype'] == 'type/swf'){
 199                                         $this->mat_content[$this->item_num] .= '<object type="application/x-shockwave-flash" data="' . $this->attributes[$this->item_num][$name]['uri'] . '" width="550" height="400"><param name="movie" value="'. $this->attributes[$this->item_num][$name]['uri'] .'" /></object>';
 200                                 } elseif ($this->attributes[$this->item_num][$name]['videotype'] == 'type/mov'){
 201                                         $this->mat_content[$this->item_num] .= '<object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" width="550" height="400" codebase="http://www.apple.com/qtactivex/qtplugin.cab"><param name="src" value="'. $this->attributes[$this->item_num][$name]['uri'] . '" /><param name="autoplay" value="true" /><param name="controller" value="true" /><embed src="' . $this->attributes[$this->item_num][$name]['uri'] .'" width="550" height="400" controller="true" pluginspage="http://www.apple.com/quicktime/download/"></embed></object>';
 202                                 }
 203                                 break;
 204                         case 'matapplet':
 205                                 (($this->attributes[$this->item_num][$name]['width'] != 0)? $width = $this->attributes[$this->item_num][$name]['width'] : $width = 460);
 206                                 (($this->attributes[$this->item_num][$name]['height'] != 0)? $height = $this->attributes[$this->item_num][$name]['height'] : $height = 160);
 207                                 $this->mat_content[$this->item_num] .= '<applet code="'.$this->attributes[$this->item_num][$name]['uri'].'" width="'.$width.'" height="'.$height.'" alt="Applet not loaded."></applet>';
 208                                 break;
 209                         case 'material':
 210                                 //check who is mattext's ancestor, started from the most known inner layer
 211                                 if (in_array('response_label', $this->element_path)){
 212                                         if(!in_array($this->mat_content, $this->choices)){
 213                                                 //This is one of the choices.
 214                                                 if (!empty($this->response_label[$this->item_num])){
 215                                                         $this->choices[$this->item_num][array_pop($this->response_label[$this->item_num])] = $this->mat_content[$this->item_num];
 216                                                 }
 217                                         }
 218                                 } elseif (in_array('response_grp', $this->element_path) || in_array('response_lid', $this->element_path)){
 219                                         //for matching, where there are groups
 220                                         //keep in mind that Respondus handles this by using response_lid
 221                                         $this->groups[$this->item_num][] = $this->reconstructRelativePath($this->mat_content[$this->item_num]);
 222 //                                      debug($this->character_data, 'harris - groups');
 223                                 } elseif (in_array('presentation', $this->element_path)){
 224                                         $this->question[$this->item_num] = $this->reconstructRelativePath($this->mat_content[$this->item_num]);
 225                                 } elseif (in_array('itemfeedback', $this->element_path)){
 226                                         $this->feedback[$this->item_num] = $this->mat_content[$this->item_num];
 227                                 }
 228                                 //once material is closed, reset the mat_content variable.
 229                                 $this->mat_content[$this->item_num] = '';
 230                                 break;
 231                         case 'varequal':
 232                                 //stores the answers (either correct or incorrect) into a stack
 233                                 $this->temp_answer[$this->attributes[$this->item_num][$name]['respident']]['name'][] = $this->character_data;
 234                                 //responses handling, remember to save the answers or match them up
 235                                 if (!is_array($this->answers[$this->item_num])){
 236                                         $this->answers[$this->item_num] = array();
 237                                 }
 238                                 array_push($this->answers[$this->item_num], $this->reconstructRelativePath($this->character_data));
 239                                 break;
 240                         case 'setvar':
 241                                 $this->temp_answer[$this->attributes[$this->item_num]['varequal']['respident']]['value'][] = $this->character_data;
 242                                 $this->temp_answer[$this->attributes[$this->item_num]['varequal']['respident']]['attribute'][] = $this->attributes[$this->item_num]['setvar']['varname'];
 243                                 break;
 244                         case 'respcondition':
 245                                 if (empty($this->temp_answer)) {
 246                                         break;
 247                                 }
 248
 249                                 //closing this tag means a selection of choices have ended.  Assign the correct answer in this case.
 250                                 $tv = $this->temp_answer[$this->attributes[$this->item_num]['varequal']['respident']];
 251 //                              debug($tv, 'harris'.$this->item_num);
 252 //                              debug($this->answers_for_matching[$this->item_num], 'answers');
 253
 254                                 //If matching, then attribute = 'Respondus_correct'; otherwise it is 'que_score'
 255                                 if ($this->getQuestionType($this->item_num) == 5){
 256                                         if ($tv['answerAdded']!=true && !empty($tv['attribute'])){
 257                                                 foreach ($tv['attribute'] as $att_id => $att_value){
 258                                                         //Handles Respondus' (and blakcboard, angels, etc) responses schemas
 259                                                         if (strtolower($att_value)=='respondus_correct'){
 260                                                                 //Then this is the right answer
 261                                                                 if (!is_array($this->answers_for_matching[$this->item_num])){
 262                                                                         $this->answers_for_matching[$this->item_num] = array();
 263                                                                 }
 264                                                                 //The condition here is to check rather the answers have been duplicated, otherwise the indexing won't be right.
 265                                                                 //sizeof[answers] != sizeof[questions], then the index matching is wrong.
 266                                                                 //Created a problem though, which is then many-to-1 matching fails, cuz answers will be repeated.
 267                                                                 //Sep 2,08, Fixed by adding a flag into the array
 268         //                                                      if (!in_array($tv['name'][$att_id], $this->answers_for_matching[$this->item_num])){
 269                                                                         array_push($this->answers_for_matching[$this->item_num], $tv['name'][$att_id]);
 270                                                                         $this->temp_answer[$this->attributes[$this->item_num]['varequal']['respident']]['answerAdded'] = true;
 271
 272                                                                         //add mark
 273                                                                         $this->weights[$this->item_num] = floatval($tv['value'][$att_id]);
 274         //                                                      }
 275                                                                 break;
 276                                                         }
 277                                                 }
 278                                         }
 279                                 } else {
 280                                         $pos = sizeof($tv['value']) - 1;        //position of the last entry of the "temp answer's value" array
 281                                         //Retrieve the last entry of the "temp answer's value" array
 282                                         $current_answer = $tv['value'][$pos];
 283                                         if (floatval($current_answer) > 0){
 284                                                 if (!is_array($this->answers_for_matching[$this->item_num])){
 285                                                         $this->answers_for_matching[$this->item_num] = array();
 286                                                 }
 287 //                                                      if (!in_array($tv['name'][$val_id], $this->answers_for_matching[$this->item_num])){
 288                                                         array_push($this->answers_for_matching[$this->item_num], $tv['name'][$pos]);
 289
 290                                                         //add mark
 291                                                         $this->weights[$this->item_num] += floatval($current_answer);
 292 //                                                      }
 293                                         }
 294                                 }
 295                                 break;
 296                         case 'fieldlabel':
 297                                 $this->field_label[$this->item_num] = $this->character_data;
 298                                 break;
 299                         case 'fieldentry':
 300                                 $this->field_entry[$this->item_num][$this->field_label[$this->item_num]] = $this->character_data;
 301                                 break;
 302                         case 'qmd_itemtype':
 303                                 //Deprecated as of QTI 1.2.
 304                                 if (empty($this->field_entry[$this->item_num][$name])){
 305                                         $this->field_entry[$this->item_num][$name] = $this->character_data;
 306                                 }
 307                                 break;
 308                         default:
 309                                 break;
 310                 }
 311 //              debug($this->element_path, "Ele Path");
 312
 313                 //pop stack and reset character data, o/w it will stack up
 314                 array_pop($this->element_path);
 315                 $this->character_data = '';
 316         }
 317
 318         // private
 319         function characterData($parser, $data){
 320                 global $addslashes;
 321                 if (trim($data)!=''){
 322                         $this->character_data .= $addslashes(preg_replace('/[\t\0\x0B(\r\n)]*/', '', $data));
 323 //                      $this->character_data .= trim($data);
 324                 }
 325         }
 326
 327         /*
 328          * This function returns the question type of this XML.
 329          * @access      public
 330          * @param       the item_num
 331          * @return  1: m/c
 332      *          2: t/f
 333      *          3: open ended question
 334      *          4: likert
 335      *          5: s match
 336      *          6: order
 337      *          7: m/a
 338      *          8: g match
 339      *          false for not found.
 340          */
 341         function getQuestionType($item_num){
 342                 switch ($this->field_entry[$item_num]['qmd_questiontype']){
 343                         case 'Multiple-choice':
 344                                 //1, 4
 345                                 //likert have no answers
 346                                 if (empty($this->answers)){
 347                                         return 4;
 348                                 }
 349                                 return 1;
 350                                 break;
 351                         case 'True/false':
 352                                 return 2;
 353                                 break;
 354                         case 'FIB-string':
 355                                 return 3;
 356                                 break;
 357                         case 'Drag-and-drop':
 358                                 return 5;
 359                                 break;
 360                         case 'Multiple-response':
 361                                 return 7;
 362                                 break;
 363                 }
 364
 365                 switch ($this->field_entry[$item_num]['qmd_itemtype']){
 366                         case 'Matching':
 367                                 //matching
 368                                 return 5;
 369                                 break;
 370                 }
 371
 372                 //handles CC packages
 373                 switch ($this->field_entry[$item_num]['cc_profile']){
 374                         case 'cc.multiple_choice.v0p1':
 375                                 return 1;
 376                                 break;
 377                         case 'cc.true_false.v0p1':
 378                                 return 2;
 379                                 break;
 380                         case 'cc.fib.v0p1':
 381                                 return 3;
 382                                 break;
 383                         case 'cc.multiple_response.v0p1':
 384                                 return 7;
 385                                 break;
 386                 }
 387
 388
 389                 //Check if this is an ordering, or matching
 390                 $response_obj;
 391                 switch ($this->response_type[$item_num]){
 392                         case AT_QTI_REPONSE_LID:
 393                                 $response_obj = $this->attributes[$item_num]['response_lid'];
 394                                 break;
 395                         case AT_QTI_REPONSE_GRP:
 396                                 $response_obj = $this->attributes[$item_num]['response_grp'];
 397                                 break;
 398                         case AT_QTI_REPONSE_STR:
 399                                 $response_obj = $this->attributes[$item_num]['response_str'];
 400                                 return 3;       //no need to parse the rcardinality?
 401                                 break;
 402                 }
 403                 if ($response_obj['rcardinality'] == 'Ordered'){
 404                         return 6;
 405                 } elseif ($response_obj['rcardinality'] == 'Multiple'){
 406                         //TODO Multiple answers, Simple matching and Graphical matching
 407                         if (empty($this->field_entry[$item_num])){
 408                                 return 7;
 409                         }
 410                         return 5;
 411                 } elseif ($response_obj['rcardinality'] == 'Single'){
 412                         return 1; //assume mc
 413                 }
 414
 415                 //None found.
 416                 return false;
 417         }
 418
 419
 420         //set relative path
 421         //must be used before calling parse.  Otherwise it will be null.
 422         //private
 423         function setRelativePath($path){
 424                 if ($path != ''){
 425                         if ($path[-1] != '/'){
 426                                 $path .= '/';
 427                         }
 428                         $this->relative_path = $path;
 429                 }
 430         }
 431
 432
 433         //private
 434         //when importing, the path of the images are all changed.  Have to parse them out and add the extra path in.
 435         //No longer needed to reconstruct, just needed to save the path, as of Aug 25th, 08.  Decided to overwrite files if the same name exist.
 436         function reconstructRelativePath($path){
 437                 //match img tag, all.
 438 //              if (preg_match_all('/\<img(\s[^\>])*\ssrc\=[\\\\]?\"([^\\\\^\"]+)[\\\\]?\".*\/?\>/i', $path, $matches) > 0){
 439 //fixes multiple image tags within a $path
 440                 if (preg_match_all('/\<img(\s[\w^img]+\=[\\\\]?\"[^\\\\^\"]+[\\\\]?\")*\ssrc\=[\\\\]?\"([^\\\\^\"]+)[\\\\]?\"/i', $path, $matches) > 0){
 441                         foreach ($matches[2] as $k=>$v){
 442                                 if(strpos($v, 'http://')===false && !in_array($v, $this->items)) {
 443                                         $this->items[] = $v;    //save the url of this media.
 444         //                              $path = str_replace($v, $this->relative_path.$v, $path);
 445                                 }
 446                         }
 447                         return $path;
 448                 } elseif (preg_match_all('/\<embed(\s[^\>])*\ssrc\=[\\\\]?\"([^\\\\^\"]+)[\\\\]?\".*/i', $path, $matches) > 0){
 449                         foreach ($matches[2] as $k=>$v){
 450                                 if(strpos($v, 'http://')===false && !in_array($v, $this->items)) {
 451                                         $this->items[] = $v;    //save the url of this media.
 452         //                              $path = str_replace($v, $this->relative_path.$v, $path);
 453                                 }
 454                         }
 455                         return $path;
 456                 } else {
 457                         return $path;
 458                 }
 459         }
 460
 461
 462         //public
 463         function close(){
 464                 //Free the XML parser
 465                 unset($this->response_label);
 466                 unset($this->field_label);
 467                 unset($this->temp_answer);
 468                 xml_parser_free($this->parser);
 469         }
 470
 471 }
 472
 473 ?>