mod/quiz/lib.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Library of functions for the quiz module.
  19  *
  20  * This contains functions that are called also from outside the quiz module
  21  * Functions that are only called by the quiz module itself are in {@link locallib.php}
  22  *
  23  * @package    mod_quiz
  24  * @copyright  1999 onwards Martin Dougiamas {@link http://moodle.com}
  25  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26  */
  27
  28
  29 defined('MOODLE_INTERNAL') || die();
  30
  31 require_once($CFG->libdir . '/eventslib.php');
  32 require_once($CFG->dirroot . '/calendar/lib.php');
  33
  34
  35 /**#@+
  36  * Option controlling what options are offered on the quiz settings form.
  37  */
  38 define('QUIZ_MAX_ATTEMPT_OPTION', 10);
  39 define('QUIZ_MAX_QPP_OPTION', 50);
  40 define('QUIZ_MAX_DECIMAL_OPTION', 5);
  41 define('QUIZ_MAX_Q_DECIMAL_OPTION', 7);
  42 /**#@-*/
  43
  44 /**#@+
  45  * Options determining how the grades from individual attempts are combined to give
  46  * the overall grade for a user
  47  */
  48 define('QUIZ_GRADEHIGHEST', '1');
  49 define('QUIZ_GRADEAVERAGE', '2');
  50 define('QUIZ_ATTEMPTFIRST', '3');
  51 define('QUIZ_ATTEMPTLAST',  '4');
  52 /**#@-*/
  53
  54 /**
  55  * @var int If start and end date for the quiz are more than this many seconds apart
  56  * they will be represented by two separate events in the calendar
  57  */
  58 define('QUIZ_MAX_EVENT_LENGTH', 5*24*60*60); // 5 days.
  59
  60 /**#@+
  61  * Options for navigation method within quizzes.
  62  */
  63 define('QUIZ_NAVMETHOD_FREE', 'free');
  64 define('QUIZ_NAVMETHOD_SEQ',  'sequential');
  65 /**#@-*/
  66
  67 /**
  68  * Given an object containing all the necessary data,
  69  * (defined by the form in mod_form.php) this function
  70  * will create a new instance and return the id number
  71  * of the new instance.
  72  *
  73  * @param object $quiz the data that came from the form.
  74  * @return mixed the id of the new instance on success,
  75  *          false or a string error message on failure.
  76  */
  77 function quiz_add_instance($quiz) {
  78     global $DB;
  79     $cmid = $quiz->coursemodule;
  80
  81     // Process the options from the form.
  82     $quiz->created = time();
  83     $result = quiz_process_options($quiz);
  84     if ($result && is_string($result)) {
  85         return $result;
  86     }
  87
  88     // Try to store it in the database.
  89     $quiz->id = $DB->insert_record('quiz', $quiz);
  90
  91     // Do the processing required after an add or an update.
  92     quiz_after_add_or_update($quiz);
  93
  94     return $quiz->id;
  95 }
  96
  97 /**
  98  * Given an object containing all the necessary data,
  99  * (defined by the form in mod_form.php) this function
 100  * will update an existing instance with new data.
 101  *
 102  * @param object $quiz the data that came from the form.
 103  * @return mixed true on success, false or a string error message on failure.
 104  */
 105 function quiz_update_instance($quiz, $mform) {
 106     global $CFG, $DB;
 107     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 108
 109     // Process the options from the form.
 110     $result = quiz_process_options($quiz);
 111     if ($result && is_string($result)) {
 112         return $result;
 113     }
 114
 115     // Get the current value, so we can see what changed.
 116     $oldquiz = $DB->get_record('quiz', array('id' => $quiz->instance));
 117
 118     // We need two values from the existing DB record that are not in the form,
 119     // in some of the function calls below.
 120     $quiz->sumgrades = $oldquiz->sumgrades;
 121     $quiz->grade     = $oldquiz->grade;
 122
 123     // Update the database.
 124     $quiz->id = $quiz->instance;
 125     $DB->update_record('quiz', $quiz);
 126
 127     // Do the processing required after an add or an update.
 128     quiz_after_add_or_update($quiz);
 129
 130     if ($oldquiz->grademethod != $quiz->grademethod) {
 131         quiz_update_all_final_grades($quiz);
 132         quiz_update_grades($quiz);
 133     }
 134
 135     $quizdateschanged = $oldquiz->timelimit   != $quiz->timelimit
 136                      || $oldquiz->timeclose   != $quiz->timeclose
 137                      || $oldquiz->graceperiod != $quiz->graceperiod;
 138     if ($quizdateschanged) {
 139         quiz_update_open_attempts(array('quizid' => $quiz->id));
 140     }
 141
 142     // Delete any previous preview attempts.
 143     quiz_delete_previews($quiz);
 144
 145     // Repaginate, if asked to.
 146     if (!$quiz->shufflequestions && !empty($quiz->repaginatenow)) {
 147         quiz_repaginate_questions($quiz->id, $quiz->questionsperpage);
 148     }
 149
 150     return true;
 151 }
 152
 153 /**
 154  * Given an ID of an instance of this module,
 155  * this function will permanently delete the instance
 156  * and any data that depends on it.
 157  *
 158  * @param int $id the id of the quiz to delete.
 159  * @return bool success or failure.
 160  */
 161 function quiz_delete_instance($id) {
 162     global $DB;
 163
 164     $quiz = $DB->get_record('quiz', array('id' => $id), '*', MUST_EXIST);
 165
 166     quiz_delete_all_attempts($quiz);
 167     quiz_delete_all_overrides($quiz);
 168
 169     // Look for random questions that may no longer be used when this quiz is gone.
 170     $sql = "SELECT q.id
 171               FROM {quiz_slots} slot
 172               JOIN {question} q ON q.id = slot.questionid
 173              WHERE slot.quizid = ? AND q.qtype = ?";
 174     $questionids = $DB->get_fieldset_sql($sql, array($quiz->id, 'random'));
 175
 176     // We need to do this before we try and delete randoms, otherwise they would still be 'in use'.
 177     $DB->delete_records('quiz_slots', array('quizid' => $quiz->id));
 178
 179     foreach ($questionids as $questionid) {
 180         question_delete_question($questionid);
 181     }
 182
 183     $DB->delete_records('quiz_feedback', array('quizid' => $quiz->id));
 184
 185     quiz_access_manager::delete_settings($quiz);
 186
 187     $events = $DB->get_records('event', array('modulename' => 'quiz', 'instance' => $quiz->id));
 188     foreach ($events as $event) {
 189         $event = calendar_event::load($event);
 190         $event->delete();
 191     }
 192
 193     quiz_grade_item_delete($quiz);
 194     $DB->delete_records('quiz', array('id' => $quiz->id));
 195
 196     return true;
 197 }
 198
 199 /**
 200  * Deletes a quiz override from the database and clears any corresponding calendar events
 201  *
 202  * @param object $quiz The quiz object.
 203  * @param int $overrideid The id of the override being deleted
 204  * @return bool true on success
 205  */
 206 function quiz_delete_override($quiz, $overrideid) {
 207     global $DB;
 208
 209     if (!isset($quiz->cmid)) {
 210         $cm = get_coursemodule_from_instance('quiz', $quiz->id, $quiz->course);
 211         $quiz->cmid = $cm->id;
 212     }
 213
 214     $override = $DB->get_record('quiz_overrides', array('id' => $overrideid), '*', MUST_EXIST);
 215
 216     // Delete the events.
 217     $events = $DB->get_records('event', array('modulename' => 'quiz',
 218             'instance' => $quiz->id, 'groupid' => (int)$override->groupid,
 219             'userid' => (int)$override->userid));
 220     foreach ($events as $event) {
 221         $eventold = calendar_event::load($event);
 222         $eventold->delete();
 223     }
 224
 225     $DB->delete_records('quiz_overrides', array('id' => $overrideid));
 226
 227     // Set the common parameters for one of the events we will be triggering.
 228     $params = array(
 229         'objectid' => $override->id,
 230         'context' => context_module::instance($quiz->cmid),
 231         'other' => array(
 232             'quizid' => $override->quiz
 233         )
 234     );
 235     // Determine which override deleted event to fire.
 236     if (!empty($override->userid)) {
 237         $params['relateduserid'] = $override->userid;
 238         $event = \mod_quiz\event\user_override_deleted::create($params);
 239     } else {
 240         $params['other']['groupid'] = $override->groupid;
 241         $event = \mod_quiz\event\group_override_deleted::create($params);
 242     }
 243
 244     // Trigger the override deleted event.
 245     $event->add_record_snapshot('quiz_overrides', $override);
 246     $event->trigger();
 247
 248     return true;
 249 }
 250
 251 /**
 252  * Deletes all quiz overrides from the database and clears any corresponding calendar events
 253  *
 254  * @param object $quiz The quiz object.
 255  */
 256 function quiz_delete_all_overrides($quiz) {
 257     global $DB;
 258
 259     $overrides = $DB->get_records('quiz_overrides', array('quiz' => $quiz->id), 'id');
 260     foreach ($overrides as $override) {
 261         quiz_delete_override($quiz, $override->id);
 262     }
 263 }
 264
 265 /**
 266  * Updates a quiz object with override information for a user.
 267  *
 268  * Algorithm:  For each quiz setting, if there is a matching user-specific override,
 269  *   then use that otherwise, if there are group-specific overrides, return the most
 270  *   lenient combination of them.  If neither applies, leave the quiz setting unchanged.
 271  *
 272  *   Special case: if there is more than one password that applies to the user, then
 273  *   quiz->extrapasswords will contain an array of strings giving the remaining
 274  *   passwords.
 275  *
 276  * @param object $quiz The quiz object.
 277  * @param int $userid The userid.
 278  * @return object $quiz The updated quiz object.
 279  */
 280 function quiz_update_effective_access($quiz, $userid) {
 281     global $DB;
 282
 283     // Check for user override.
 284     $override = $DB->get_record('quiz_overrides', array('quiz' => $quiz->id, 'userid' => $userid));
 285
 286     if (!$override) {
 287         $override = new stdClass();
 288         $override->timeopen = null;
 289         $override->timeclose = null;
 290         $override->timelimit = null;
 291         $override->attempts = null;
 292         $override->password = null;
 293     }
 294
 295     // Check for group overrides.
 296     $groupings = groups_get_user_groups($quiz->course, $userid);
 297
 298     if (!empty($groupings[0])) {
 299         // Select all overrides that apply to the User's groups.
 300         list($extra, $params) = $DB->get_in_or_equal(array_values($groupings[0]));
 301         $sql = "SELECT * FROM {quiz_overrides}
 302                 WHERE groupid $extra AND quiz = ?";
 303         $params[] = $quiz->id;
 304         $records = $DB->get_records_sql($sql, $params);
 305
 306         // Combine the overrides.
 307         $opens = array();
 308         $closes = array();
 309         $limits = array();
 310         $attempts = array();
 311         $passwords = array();
 312
 313         foreach ($records as $gpoverride) {
 314             if (isset($gpoverride->timeopen)) {
 315                 $opens[] = $gpoverride->timeopen;
 316             }
 317             if (isset($gpoverride->timeclose)) {
 318                 $closes[] = $gpoverride->timeclose;
 319             }
 320             if (isset($gpoverride->timelimit)) {
 321                 $limits[] = $gpoverride->timelimit;
 322             }
 323             if (isset($gpoverride->attempts)) {
 324                 $attempts[] = $gpoverride->attempts;
 325             }
 326             if (isset($gpoverride->password)) {
 327                 $passwords[] = $gpoverride->password;
 328             }
 329         }
 330         // If there is a user override for a setting, ignore the group override.
 331         if (is_null($override->timeopen) && count($opens)) {
 332             $override->timeopen = min($opens);
 333         }
 334         if (is_null($override->timeclose) && count($closes)) {
 335             if (in_array(0, $closes)) {
 336                 $override->timeclose = 0;
 337             } else {
 338                 $override->timeclose = max($closes);
 339             }
 340         }
 341         if (is_null($override->timelimit) && count($limits)) {
 342             if (in_array(0, $limits)) {
 343                 $override->timelimit = 0;
 344             } else {
 345                 $override->timelimit = max($limits);
 346             }
 347         }
 348         if (is_null($override->attempts) && count($attempts)) {
 349             if (in_array(0, $attempts)) {
 350                 $override->attempts = 0;
 351             } else {
 352                 $override->attempts = max($attempts);
 353             }
 354         }
 355         if (is_null($override->password) && count($passwords)) {
 356             $override->password = array_shift($passwords);
 357             if (count($passwords)) {
 358                 $override->extrapasswords = $passwords;
 359             }
 360         }
 361
 362     }
 363
 364     // Merge with quiz defaults.
 365     $keys = array('timeopen', 'timeclose', 'timelimit', 'attempts', 'password', 'extrapasswords');
 366     foreach ($keys as $key) {
 367         if (isset($override->{$key})) {
 368             $quiz->{$key} = $override->{$key};
 369         }
 370     }
 371
 372     return $quiz;
 373 }
 374
 375 /**
 376  * Delete all the attempts belonging to a quiz.
 377  *
 378  * @param object $quiz The quiz object.
 379  */
 380 function quiz_delete_all_attempts($quiz) {
 381     global $CFG, $DB;
 382     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 383     question_engine::delete_questions_usage_by_activities(new qubaids_for_quiz($quiz->id));
 384     $DB->delete_records('quiz_attempts', array('quiz' => $quiz->id));
 385     $DB->delete_records('quiz_grades', array('quiz' => $quiz->id));
 386 }
 387
 388 /**
 389  * Get the best current grade for a particular user in a quiz.
 390  *
 391  * @param object $quiz the quiz settings.
 392  * @param int $userid the id of the user.
 393  * @return float the user's current grade for this quiz, or null if this user does
 394  * not have a grade on this quiz.
 395  */
 396 function quiz_get_best_grade($quiz, $userid) {
 397     global $DB;
 398     $grade = $DB->get_field('quiz_grades', 'grade',
 399             array('quiz' => $quiz->id, 'userid' => $userid));
 400
 401     // Need to detect errors/no result, without catching 0 grades.
 402     if ($grade === false) {
 403         return null;
 404     }
 405
 406     return $grade + 0; // Convert to number.
 407 }
 408
 409 /**
 410  * Is this a graded quiz? If this method returns true, you can assume that
 411  * $quiz->grade and $quiz->sumgrades are non-zero (for example, if you want to
 412  * divide by them).
 413  *
 414  * @param object $quiz a row from the quiz table.
 415  * @return bool whether this is a graded quiz.
 416  */
 417 function quiz_has_grades($quiz) {
 418     return $quiz->grade >= 0.000005 && $quiz->sumgrades >= 0.000005;
 419 }
 420
 421 /**
 422  * Does this quiz allow multiple tries?
 423  *
 424  * @return bool
 425  */
 426 function quiz_allows_multiple_tries($quiz) {
 427     $bt = question_engine::get_behaviour_type($quiz->preferredbehaviour);
 428     return $bt->allows_multiple_submitted_responses();
 429 }
 430
 431 /**
 432  * Return a small object with summary information about what a
 433  * user has done with a given particular instance of this module
 434  * Used for user activity reports.
 435  * $return->time = the time they did it
 436  * $return->info = a short text description
 437  *
 438  * @param object $course
 439  * @param object $user
 440  * @param object $mod
 441  * @param object $quiz
 442  * @return object|null
 443  */
 444 function quiz_user_outline($course, $user, $mod, $quiz) {
 445     global $DB, $CFG;
 446     require_once($CFG->libdir . '/gradelib.php');
 447     $grades = grade_get_grades($course->id, 'mod', 'quiz', $quiz->id, $user->id);
 448
 449     if (empty($grades->items[0]->grades)) {
 450         return null;
 451     } else {
 452         $grade = reset($grades->items[0]->grades);
 453     }
 454
 455     $result = new stdClass();
 456     $result->info = get_string('grade') . ': ' . $grade->str_long_grade;
 457
 458     // Datesubmitted == time created. dategraded == time modified or time overridden
 459     // if grade was last modified by the user themselves use date graded. Otherwise use
 460     // date submitted.
 461     // TODO: move this copied & pasted code somewhere in the grades API. See MDL-26704.
 462     if ($grade->usermodified == $user->id || empty($grade->datesubmitted)) {
 463         $result->time = $grade->dategraded;
 464     } else {
 465         $result->time = $grade->datesubmitted;
 466     }
 467
 468     return $result;
 469 }
 470
 471 /**
 472  * Print a detailed representation of what a  user has done with
 473  * a given particular instance of this module, for user activity reports.
 474  *
 475  * @param object $course
 476  * @param object $user
 477  * @param object $mod
 478  * @param object $quiz
 479  * @return bool
 480  */
 481 function quiz_user_complete($course, $user, $mod, $quiz) {
 482     global $DB, $CFG, $OUTPUT;
 483     require_once($CFG->libdir . '/gradelib.php');
 484     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 485
 486     $grades = grade_get_grades($course->id, 'mod', 'quiz', $quiz->id, $user->id);
 487     if (!empty($grades->items[0]->grades)) {
 488         $grade = reset($grades->items[0]->grades);
 489         echo $OUTPUT->container(get_string('grade').': '.$grade->str_long_grade);
 490         if ($grade->str_feedback) {
 491             echo $OUTPUT->container(get_string('feedback').': '.$grade->str_feedback);
 492         }
 493     }
 494
 495     if ($attempts = $DB->get_records('quiz_attempts',
 496             array('userid' => $user->id, 'quiz' => $quiz->id), 'attempt')) {
 497         foreach ($attempts as $attempt) {
 498             echo get_string('attempt', 'quiz', $attempt->attempt) . ': ';
 499             if ($attempt->state != quiz_attempt::FINISHED) {
 500                 echo quiz_attempt_state_name($attempt->state);
 501             } else {
 502                 echo quiz_format_grade($quiz, $attempt->sumgrades) . '/' .
 503                         quiz_format_grade($quiz, $quiz->sumgrades);
 504             }
 505             echo ' - '.userdate($attempt->timemodified).'<br />';
 506         }
 507     } else {
 508         print_string('noattempts', 'quiz');
 509     }
 510
 511     return true;
 512 }
 513
 514 /**
 515  * Quiz periodic clean-up tasks.
 516  */
 517 function quiz_cron() {
 518     global $CFG;
 519
 520     require_once($CFG->dirroot . '/mod/quiz/cronlib.php');
 521     mtrace('');
 522
 523     $timenow = time();
 524     $overduehander = new mod_quiz_overdue_attempt_updater();
 525
 526     $processto = $timenow - get_config('quiz', 'graceperiodmin');
 527
 528     mtrace('  Looking for quiz overdue quiz attempts...');
 529
 530     list($count, $quizcount) = $overduehander->update_overdue_attempts($timenow, $processto);
 531
 532     mtrace('  Considered ' . $count . ' attempts in ' . $quizcount . ' quizzes.');
 533
 534     // Run cron for our sub-plugin types.
 535     cron_execute_plugin_type('quiz', 'quiz reports');
 536     cron_execute_plugin_type('quizaccess', 'quiz access rules');
 537
 538     return true;
 539 }
 540
 541 /**
 542  * @param int $quizid the quiz id.
 543  * @param int $userid the userid.
 544  * @param string $status 'all', 'finished' or 'unfinished' to control
 545  * @param bool $includepreviews
 546  * @return an array of all the user's attempts at this quiz. Returns an empty
 547  *      array if there are none.
 548  */
 549 function quiz_get_user_attempts($quizid, $userid, $status = 'finished', $includepreviews = false) {
 550     global $DB, $CFG;
 551     // TODO MDL-33071 it is very annoying to have to included all of locallib.php
 552     // just to get the quiz_attempt::FINISHED constants, but I will try to sort
 553     // that out properly for Moodle 2.4. For now, I will just do a quick fix for
 554     // MDL-33048.
 555     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 556
 557     $params = array();
 558     switch ($status) {
 559         case 'all':
 560             $statuscondition = '';
 561             break;
 562
 563         case 'finished':
 564             $statuscondition = ' AND state IN (:state1, :state2)';
 565             $params['state1'] = quiz_attempt::FINISHED;
 566             $params['state2'] = quiz_attempt::ABANDONED;
 567             break;
 568
 569         case 'unfinished':
 570             $statuscondition = ' AND state IN (:state1, :state2)';
 571             $params['state1'] = quiz_attempt::IN_PROGRESS;
 572             $params['state2'] = quiz_attempt::OVERDUE;
 573             break;
 574     }
 575
 576     $previewclause = '';
 577     if (!$includepreviews) {
 578         $previewclause = ' AND preview = 0';
 579     }
 580
 581     $params['quizid'] = $quizid;
 582     $params['userid'] = $userid;
 583     return $DB->get_records_select('quiz_attempts',
 584             'quiz = :quizid AND userid = :userid' . $previewclause . $statuscondition,
 585             $params, 'attempt ASC');
 586 }
 587
 588 /**
 589  * Return grade for given user or all users.
 590  *
 591  * @param int $quizid id of quiz
 592  * @param int $userid optional user id, 0 means all users
 593  * @return array array of grades, false if none. These are raw grades. They should
 594  * be processed with quiz_format_grade for display.
 595  */
 596 function quiz_get_user_grades($quiz, $userid = 0) {
 597     global $CFG, $DB;
 598
 599     $params = array($quiz->id);
 600     $usertest = '';
 601     if ($userid) {
 602         $params[] = $userid;
 603         $usertest = 'AND u.id = ?';
 604     }
 605     return $DB->get_records_sql("
 606             SELECT
 607                 u.id,
 608                 u.id AS userid,
 609                 qg.grade AS rawgrade,
 610                 qg.timemodified AS dategraded,
 611                 MAX(qa.timefinish) AS datesubmitted
 612
 613             FROM {user} u
 614             JOIN {quiz_grades} qg ON u.id = qg.userid
 615             JOIN {quiz_attempts} qa ON qa.quiz = qg.quiz AND qa.userid = u.id
 616
 617             WHERE qg.quiz = ?
 618             $usertest
 619             GROUP BY u.id, qg.grade, qg.timemodified", $params);
 620 }
 621
 622 /**
 623  * Round a grade to to the correct number of decimal places, and format it for display.
 624  *
 625  * @param object $quiz The quiz table row, only $quiz->decimalpoints is used.
 626  * @param float $grade The grade to round.
 627  * @return float
 628  */
 629 function quiz_format_grade($quiz, $grade) {
 630     if (is_null($grade)) {
 631         return get_string('notyetgraded', 'quiz');
 632     }
 633     return format_float($grade, $quiz->decimalpoints);
 634 }
 635
 636 /**
 637  * Round a grade to to the correct number of decimal places, and format it for display.
 638  *
 639  * @param object $quiz The quiz table row, only $quiz->decimalpoints is used.
 640  * @param float $grade The grade to round.
 641  * @return float
 642  */
 643 function quiz_format_question_grade($quiz, $grade) {
 644     if (empty($quiz->questiondecimalpoints)) {
 645         $quiz->questiondecimalpoints = -1;
 646     }
 647     if ($quiz->questiondecimalpoints == -1) {
 648         return format_float($grade, $quiz->decimalpoints);
 649     } else {
 650         return format_float($grade, $quiz->questiondecimalpoints);
 651     }
 652 }
 653
 654 /**
 655  * Update grades in central gradebook
 656  *
 657  * @category grade
 658  * @param object $quiz the quiz settings.
 659  * @param int $userid specific user only, 0 means all users.
 660  * @param bool $nullifnone If a single user is specified and $nullifnone is true a grade item with a null rawgrade will be inserted
 661  */
 662 function quiz_update_grades($quiz, $userid = 0, $nullifnone = true) {
 663     global $CFG, $DB;
 664     require_once($CFG->libdir . '/gradelib.php');
 665
 666     if ($quiz->grade == 0) {
 667         quiz_grade_item_update($quiz);
 668
 669     } else if ($grades = quiz_get_user_grades($quiz, $userid)) {
 670         quiz_grade_item_update($quiz, $grades);
 671
 672     } else if ($userid && $nullifnone) {
 673         $grade = new stdClass();
 674         $grade->userid = $userid;
 675         $grade->rawgrade = null;
 676         quiz_grade_item_update($quiz, $grade);
 677
 678     } else {
 679         quiz_grade_item_update($quiz);
 680     }
 681 }
 682
 683 /**
 684  * Update all grades in gradebook.
 685  */
 686 function quiz_upgrade_grades() {
 687     global $DB;
 688
 689     $sql = "SELECT COUNT('x')
 690               FROM {quiz} a, {course_modules} cm, {modules} m
 691              WHERE m.name='quiz' AND m.id=cm.module AND cm.instance=a.id";
 692     $count = $DB->count_records_sql($sql);
 693
 694     $sql = "SELECT a.*, cm.idnumber AS cmidnumber, a.course AS courseid
 695               FROM {quiz} a, {course_modules} cm, {modules} m
 696              WHERE m.name='quiz' AND m.id=cm.module AND cm.instance=a.id";
 697     $rs = $DB->get_recordset_sql($sql);
 698     if ($rs->valid()) {
 699         $pbar = new progress_bar('quizupgradegrades', 500, true);
 700         $i=0;
 701         foreach ($rs as $quiz) {
 702             $i++;
 703             upgrade_set_timeout(60*5); // Set up timeout, may also abort execution.
 704             quiz_update_grades($quiz, 0, false);
 705             $pbar->update($i, $count, "Updating Quiz grades ($i/$count).");
 706         }
 707     }
 708     $rs->close();
 709 }
 710
 711 /**
 712  * Create or update the grade item for given quiz
 713  *
 714  * @category grade
 715  * @param object $quiz object with extra cmidnumber
 716  * @param mixed $grades optional array/object of grade(s); 'reset' means reset grades in gradebook
 717  * @return int 0 if ok, error code otherwise
 718  */
 719 function quiz_grade_item_update($quiz, $grades = null) {
 720     global $CFG, $OUTPUT;
 721     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 722     require_once($CFG->libdir . '/gradelib.php');
 723
 724     if (array_key_exists('cmidnumber', $quiz)) { // May not be always present.
 725         $params = array('itemname' => $quiz->name, 'idnumber' => $quiz->cmidnumber);
 726     } else {
 727         $params = array('itemname' => $quiz->name);
 728     }
 729
 730     if ($quiz->grade > 0) {
 731         $params['gradetype'] = GRADE_TYPE_VALUE;
 732         $params['grademax']  = $quiz->grade;
 733         $params['grademin']  = 0;
 734
 735     } else {
 736         $params['gradetype'] = GRADE_TYPE_NONE;
 737     }
 738
 739     // What this is trying to do:
 740     // 1. If the quiz is set to not show grades while the quiz is still open,
 741     //    and is set to show grades after the quiz is closed, then create the
 742     //    grade_item with a show-after date that is the quiz close date.
 743     // 2. If the quiz is set to not show grades at either of those times,
 744     //    create the grade_item as hidden.
 745     // 3. If the quiz is set to show grades, create the grade_item visible.
 746     $openreviewoptions = mod_quiz_display_options::make_from_quiz($quiz,
 747             mod_quiz_display_options::LATER_WHILE_OPEN);
 748     $closedreviewoptions = mod_quiz_display_options::make_from_quiz($quiz,
 749             mod_quiz_display_options::AFTER_CLOSE);
 750     if ($openreviewoptions->marks < question_display_options::MARK_AND_MAX &&
 751             $closedreviewoptions->marks < question_display_options::MARK_AND_MAX) {
 752         $params['hidden'] = 1;
 753
 754     } else if ($openreviewoptions->marks < question_display_options::MARK_AND_MAX &&
 755             $closedreviewoptions->marks >= question_display_options::MARK_AND_MAX) {
 756         if ($quiz->timeclose) {
 757             $params['hidden'] = $quiz->timeclose;
 758         } else {
 759             $params['hidden'] = 1;
 760         }
 761
 762     } else {
 763         // Either
 764         // a) both open and closed enabled
 765         // b) open enabled, closed disabled - we can not "hide after",
 766         //    grades are kept visible even after closing.
 767         $params['hidden'] = 0;
 768     }
 769
 770     if (!$params['hidden']) {
 771         // If the grade item is not hidden by the quiz logic, then we need to
 772         // hide it if the quiz is hidden from students.
 773         if (property_exists($quiz, 'visible')) {
 774             // Saving the quiz form, and cm not yet updated in the database.
 775             $params['hidden'] = !$quiz->visible;
 776         } else {
 777             $cm = get_coursemodule_from_instance('quiz', $quiz->id);
 778             $params['hidden'] = !$cm->visible;
 779         }
 780     }
 781
 782     if ($grades  === 'reset') {
 783         $params['reset'] = true;
 784         $grades = null;
 785     }
 786
 787     $gradebook_grades = grade_get_grades($quiz->course, 'mod', 'quiz', $quiz->id);
 788     if (!empty($gradebook_grades->items)) {
 789         $grade_item = $gradebook_grades->items[0];
 790         if ($grade_item->locked) {
 791             // NOTE: this is an extremely nasty hack! It is not a bug if this confirmation fails badly. --skodak.
 792             $confirm_regrade = optional_param('confirm_regrade', 0, PARAM_INT);
 793             if (!$confirm_regrade) {
 794                 if (!AJAX_SCRIPT) {
 795                     $message = get_string('gradeitemislocked', 'grades');
 796                     $back_link = $CFG->wwwroot . '/mod/quiz/report.php?q=' . $quiz->id .
 797                             '&amp;mode=overview';
 798                     $regrade_link = qualified_me() . '&amp;confirm_regrade=1';
 799                     echo $OUTPUT->box_start('generalbox', 'notice');
 800                     echo '<p>'. $message .'</p>';
 801                     echo $OUTPUT->container_start('buttons');
 802                     echo $OUTPUT->single_button($regrade_link, get_string('regradeanyway', 'grades'));
 803                     echo $OUTPUT->single_button($back_link,  get_string('cancel'));
 804                     echo $OUTPUT->container_end();
 805                     echo $OUTPUT->box_end();
 806                 }
 807                 return GRADE_UPDATE_ITEM_LOCKED;
 808             }
 809         }
 810     }
 811
 812     return grade_update('mod/quiz', $quiz->course, 'mod', 'quiz', $quiz->id, 0, $grades, $params);
 813 }
 814
 815 /**
 816  * Delete grade item for given quiz
 817  *
 818  * @category grade
 819  * @param object $quiz object
 820  * @return object quiz
 821  */
 822 function quiz_grade_item_delete($quiz) {
 823     global $CFG;
 824     require_once($CFG->libdir . '/gradelib.php');
 825
 826     return grade_update('mod/quiz', $quiz->course, 'mod', 'quiz', $quiz->id, 0,
 827             null, array('deleted' => 1));
 828 }
 829
 830 /**
 831  * This standard function will check all instances of this module
 832  * and make sure there are up-to-date events created for each of them.
 833  * If courseid = 0, then every quiz event in the site is checked, else
 834  * only quiz events belonging to the course specified are checked.
 835  * This function is used, in its new format, by restore_refresh_events()
 836  *
 837  * @param int $courseid
 838  * @return bool
 839  */
 840 function quiz_refresh_events($courseid = 0) {
 841     global $DB;
 842
 843     if ($courseid == 0) {
 844         if (!$quizzes = $DB->get_records('quiz')) {
 845             return true;
 846         }
 847     } else {
 848         if (!$quizzes = $DB->get_records('quiz', array('course' => $courseid))) {
 849             return true;
 850         }
 851     }
 852
 853     foreach ($quizzes as $quiz) {
 854         quiz_update_events($quiz);
 855     }
 856
 857     return true;
 858 }
 859
 860 /**
 861  * Returns all quiz graded users since a given time for specified quiz
 862  */
 863 function quiz_get_recent_mod_activity(&$activities, &$index, $timestart,
 864         $courseid, $cmid, $userid = 0, $groupid = 0) {
 865     global $CFG, $USER, $DB;
 866     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
 867
 868     $course = get_course($courseid);
 869     $modinfo = get_fast_modinfo($course);
 870
 871     $cm = $modinfo->cms[$cmid];
 872     $quiz = $DB->get_record('quiz', array('id' => $cm->instance));
 873
 874     if ($userid) {
 875         $userselect = "AND u.id = :userid";
 876         $params['userid'] = $userid;
 877     } else {
 878         $userselect = '';
 879     }
 880
 881     if ($groupid) {
 882         $groupselect = 'AND gm.groupid = :groupid';
 883         $groupjoin   = 'JOIN {groups_members} gm ON  gm.userid=u.id';
 884         $params['groupid'] = $groupid;
 885     } else {
 886         $groupselect = '';
 887         $groupjoin   = '';
 888     }
 889
 890     $params['timestart'] = $timestart;
 891     $params['quizid'] = $quiz->id;
 892
 893     $ufields = user_picture::fields('u', null, 'useridagain');
 894     if (!$attempts = $DB->get_records_sql("
 895               SELECT qa.*,
 896                      {$ufields}
 897                 FROM {quiz_attempts} qa
 898                      JOIN {user} u ON u.id = qa.userid
 899                      $groupjoin
 900                WHERE qa.timefinish > :timestart
 901                  AND qa.quiz = :quizid
 902                  AND qa.preview = 0
 903                      $userselect
 904                      $groupselect
 905             ORDER BY qa.timefinish ASC", $params)) {
 906         return;
 907     }
 908
 909     $context         = context_module::instance($cm->id);
 910     $accessallgroups = has_capability('moodle/site:accessallgroups', $context);
 911     $viewfullnames   = has_capability('moodle/site:viewfullnames', $context);
 912     $grader          = has_capability('mod/quiz:viewreports', $context);
 913     $groupmode       = groups_get_activity_groupmode($cm, $course);
 914
 915     $usersgroups = null;
 916     $aname = format_string($cm->name, true);
 917     foreach ($attempts as $attempt) {
 918         if ($attempt->userid != $USER->id) {
 919             if (!$grader) {
 920                 // Grade permission required.
 921                 continue;
 922             }
 923
 924             if ($groupmode == SEPARATEGROUPS and !$accessallgroups) {
 925                 $usersgroups = groups_get_all_groups($course->id,
 926                         $attempt->userid, $cm->groupingid);
 927                 $usersgroups = array_keys($usersgroups);
 928                 if (!array_intersect($usersgroups, $modinfo->get_groups($cm->groupingid))) {
 929                     continue;
 930                 }
 931             }
 932         }
 933
 934         $options = quiz_get_review_options($quiz, $attempt, $context);
 935
 936         $tmpactivity = new stdClass();
 937
 938         $tmpactivity->type       = 'quiz';
 939         $tmpactivity->cmid       = $cm->id;
 940         $tmpactivity->name       = $aname;
 941         $tmpactivity->sectionnum = $cm->sectionnum;
 942         $tmpactivity->timestamp  = $attempt->timefinish;
 943
 944         $tmpactivity->content = new stdClass();
 945         $tmpactivity->content->attemptid = $attempt->id;
 946         $tmpactivity->content->attempt   = $attempt->attempt;
 947         if (quiz_has_grades($quiz) && $options->marks >= question_display_options::MARK_AND_MAX) {
 948             $tmpactivity->content->sumgrades = quiz_format_grade($quiz, $attempt->sumgrades);
 949             $tmpactivity->content->maxgrade  = quiz_format_grade($quiz, $quiz->sumgrades);
 950         } else {
 951             $tmpactivity->content->sumgrades = null;
 952             $tmpactivity->content->maxgrade  = null;
 953         }
 954
 955         $tmpactivity->user = user_picture::unalias($attempt, null, 'useridagain');
 956         $tmpactivity->user->fullname  = fullname($tmpactivity->user, $viewfullnames);
 957
 958         $activities[$index++] = $tmpactivity;
 959     }
 960 }
 961
 962 function quiz_print_recent_mod_activity($activity, $courseid, $detail, $modnames) {
 963     global $CFG, $OUTPUT;
 964
 965     echo '<table border="0" cellpadding="3" cellspacing="0" class="forum-recent">';
 966
 967     echo '<tr><td class="userpicture" valign="top">';
 968     echo $OUTPUT->user_picture($activity->user, array('courseid' => $courseid));
 969     echo '</td><td>';
 970
 971     if ($detail) {
 972         $modname = $modnames[$activity->type];
 973         echo '<div class="title">';
 974         echo '<img src="' . $OUTPUT->pix_url('icon', $activity->type) . '" ' .
 975                 'class="icon" alt="' . $modname . '" />';
 976         echo '<a href="' . $CFG->wwwroot . '/mod/quiz/view.php?id=' .
 977                 $activity->cmid . '">' . $activity->name . '</a>';
 978         echo '</div>';
 979     }
 980
 981     echo '<div class="grade">';
 982     echo  get_string('attempt', 'quiz', $activity->content->attempt);
 983     if (isset($activity->content->maxgrade)) {
 984         $grades = $activity->content->sumgrades . ' / ' . $activity->content->maxgrade;
 985         echo ': (<a href="' . $CFG->wwwroot . '/mod/quiz/review.php?attempt=' .
 986                 $activity->content->attemptid . '">' . $grades . '</a>)';
 987     }
 988     echo '</div>';
 989
 990     echo '<div class="user">';
 991     echo '<a href="' . $CFG->wwwroot . '/user/view.php?id=' . $activity->user->id .
 992             '&amp;course=' . $courseid . '">' . $activity->user->fullname .
 993             '</a> - ' . userdate($activity->timestamp);
 994     echo '</div>';
 995
 996     echo '</td></tr></table>';
 997
 998     return;
 999 }
1000
1001 /**
1002  * Pre-process the quiz options form data, making any necessary adjustments.
1003  * Called by add/update instance in this file.
1004  *
1005  * @param object $quiz The variables set on the form.
1006  */
1007 function quiz_process_options($quiz) {
1008     global $CFG;
1009     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
1010     require_once($CFG->libdir . '/questionlib.php');
1011
1012     $quiz->timemodified = time();
1013
1014     // Quiz name.
1015     if (!empty($quiz->name)) {
1016         $quiz->name = trim($quiz->name);
1017     }
1018
1019     // Password field - different in form to stop browsers that remember passwords
1020     // getting confused.
1021     $quiz->password = $quiz->quizpassword;
1022     unset($quiz->quizpassword);
1023
1024     // Quiz feedback.
1025     if (isset($quiz->feedbacktext)) {
1026         // Clean up the boundary text.
1027         for ($i = 0; $i < count($quiz->feedbacktext); $i += 1) {
1028             if (empty($quiz->feedbacktext[$i]['text'])) {
1029                 $quiz->feedbacktext[$i]['text'] = '';
1030             } else {
1031                 $quiz->feedbacktext[$i]['text'] = trim($quiz->feedbacktext[$i]['text']);
1032             }
1033         }
1034
1035         // Check the boundary value is a number or a percentage, and in range.
1036         $i = 0;
1037         while (!empty($quiz->feedbackboundaries[$i])) {
1038             $boundary = trim($quiz->feedbackboundaries[$i]);
1039             if (!is_numeric($boundary)) {
1040                 if (strlen($boundary) > 0 && $boundary[strlen($boundary) - 1] == '%') {
1041                     $boundary = trim(substr($boundary, 0, -1));
1042                     if (is_numeric($boundary)) {
1043                         $boundary = $boundary * $quiz->grade / 100.0;
1044                     } else {
1045                         return get_string('feedbackerrorboundaryformat', 'quiz', $i + 1);
1046                     }
1047                 }
1048             }
1049             if ($boundary <= 0 || $boundary >= $quiz->grade) {
1050                 return get_string('feedbackerrorboundaryoutofrange', 'quiz', $i + 1);
1051             }
1052             if ($i > 0 && $boundary >= $quiz->feedbackboundaries[$i - 1]) {
1053                 return get_string('feedbackerrororder', 'quiz', $i + 1);
1054             }
1055             $quiz->feedbackboundaries[$i] = $boundary;
1056             $i += 1;
1057         }
1058         $numboundaries = $i;
1059
1060         // Check there is nothing in the remaining unused fields.
1061         if (!empty($quiz->feedbackboundaries)) {
1062             for ($i = $numboundaries; $i < count($quiz->feedbackboundaries); $i += 1) {
1063                 if (!empty($quiz->feedbackboundaries[$i]) &&
1064                         trim($quiz->feedbackboundaries[$i]) != '') {
1065                     return get_string('feedbackerrorjunkinboundary', 'quiz', $i + 1);
1066                 }
1067             }
1068         }
1069         for ($i = $numboundaries + 1; $i < count($quiz->feedbacktext); $i += 1) {
1070             if (!empty($quiz->feedbacktext[$i]['text']) &&
1071                     trim($quiz->feedbacktext[$i]['text']) != '') {
1072                 return get_string('feedbackerrorjunkinfeedback', 'quiz', $i + 1);
1073             }
1074         }
1075         // Needs to be bigger than $quiz->grade because of '<' test in quiz_feedback_for_grade().
1076         $quiz->feedbackboundaries[-1] = $quiz->grade + 1;
1077         $quiz->feedbackboundaries[$numboundaries] = 0;
1078         $quiz->feedbackboundarycount = $numboundaries;
1079     } else {
1080         $quiz->feedbackboundarycount = -1;
1081     }
1082
1083     // Combing the individual settings into the review columns.
1084     $quiz->reviewattempt = quiz_review_option_form_to_db($quiz, 'attempt');
1085     $quiz->reviewcorrectness = quiz_review_option_form_to_db($quiz, 'correctness');
1086     $quiz->reviewmarks = quiz_review_option_form_to_db($quiz, 'marks');
1087     $quiz->reviewspecificfeedback = quiz_review_option_form_to_db($quiz, 'specificfeedback');
1088     $quiz->reviewgeneralfeedback = quiz_review_option_form_to_db($quiz, 'generalfeedback');
1089     $quiz->reviewrightanswer = quiz_review_option_form_to_db($quiz, 'rightanswer');
1090     $quiz->reviewoverallfeedback = quiz_review_option_form_to_db($quiz, 'overallfeedback');
1091     $quiz->reviewattempt |= mod_quiz_display_options::DURING;
1092     $quiz->reviewoverallfeedback &= ~mod_quiz_display_options::DURING;
1093 }
1094
1095 /**
1096  * Helper function for {@link quiz_process_options()}.
1097  * @param object $fromform the sumbitted form date.
1098  * @param string $field one of the review option field names.
1099  */
1100 function quiz_review_option_form_to_db($fromform, $field) {
1101     static $times = array(
1102         'during' => mod_quiz_display_options::DURING,
1103         'immediately' => mod_quiz_display_options::IMMEDIATELY_AFTER,
1104         'open' => mod_quiz_display_options::LATER_WHILE_OPEN,
1105         'closed' => mod_quiz_display_options::AFTER_CLOSE,
1106     );
1107
1108     $review = 0;
1109     foreach ($times as $whenname => $when) {
1110         $fieldname = $field . $whenname;
1111         if (isset($fromform->$fieldname)) {
1112             $review |= $when;
1113             unset($fromform->$fieldname);
1114         }
1115     }
1116
1117     return $review;
1118 }
1119
1120 /**
1121  * This function is called at the end of quiz_add_instance
1122  * and quiz_update_instance, to do the common processing.
1123  *
1124  * @param object $quiz the quiz object.
1125  */
1126 function quiz_after_add_or_update($quiz) {
1127     global $DB;
1128     $cmid = $quiz->coursemodule;
1129
1130     // We need to use context now, so we need to make sure all needed info is already in db.
1131     $DB->set_field('course_modules', 'instance', $quiz->id, array('id'=>$cmid));
1132     $context = context_module::instance($cmid);
1133
1134     // Save the feedback.
1135     $DB->delete_records('quiz_feedback', array('quizid' => $quiz->id));
1136
1137     for ($i = 0; $i <= $quiz->feedbackboundarycount; $i++) {
1138         $feedback = new stdClass();
1139         $feedback->quizid = $quiz->id;
1140         $feedback->feedbacktext = $quiz->feedbacktext[$i]['text'];
1141         $feedback->feedbacktextformat = $quiz->feedbacktext[$i]['format'];
1142         $feedback->mingrade = $quiz->feedbackboundaries[$i];
1143         $feedback->maxgrade = $quiz->feedbackboundaries[$i - 1];
1144         $feedback->id = $DB->insert_record('quiz_feedback', $feedback);
1145         $feedbacktext = file_save_draft_area_files((int)$quiz->feedbacktext[$i]['itemid'],
1146                 $context->id, 'mod_quiz', 'feedback', $feedback->id,
1147                 array('subdirs' => false, 'maxfiles' => -1, 'maxbytes' => 0),
1148                 $quiz->feedbacktext[$i]['text']);
1149         $DB->set_field('quiz_feedback', 'feedbacktext', $feedbacktext,
1150                 array('id' => $feedback->id));
1151     }
1152
1153     // Store any settings belonging to the access rules.
1154     quiz_access_manager::save_settings($quiz);
1155
1156     // Update the events relating to this quiz.
1157     quiz_update_events($quiz);
1158
1159     // Update related grade item.
1160     quiz_grade_item_update($quiz);
1161 }
1162
1163 /**
1164  * This function updates the events associated to the quiz.
1165  * If $override is non-zero, then it updates only the events
1166  * associated with the specified override.
1167  *
1168  * @uses QUIZ_MAX_EVENT_LENGTH
1169  * @param object $quiz the quiz object.
1170  * @param object optional $override limit to a specific override
1171  */
1172 function quiz_update_events($quiz, $override = null) {
1173     global $DB;
1174
1175     // Load the old events relating to this quiz.
1176     $conds = array('modulename'=>'quiz',
1177                    'instance'=>$quiz->id);
1178     if (!empty($override)) {
1179         // Only load events for this override.
1180         $conds['groupid'] = isset($override->groupid)?  $override->groupid : 0;
1181         $conds['userid'] = isset($override->userid)?  $override->userid : 0;
1182     }
1183     $oldevents = $DB->get_records('event', $conds);
1184
1185     // Now make a todo list of all that needs to be updated.
1186     if (empty($override)) {
1187         // We are updating the primary settings for the quiz, so we
1188         // need to add all the overrides.
1189         $overrides = $DB->get_records('quiz_overrides', array('quiz' => $quiz->id));
1190         // As well as the original quiz (empty override).
1191         $overrides[] = new stdClass();
1192     } else {
1193         // Just do the one override.
1194         $overrides = array($override);
1195     }
1196
1197     foreach ($overrides as $current) {
1198         $groupid   = isset($current->groupid)?  $current->groupid : 0;
1199         $userid    = isset($current->userid)? $current->userid : 0;
1200         $timeopen  = isset($current->timeopen)?  $current->timeopen : $quiz->timeopen;
1201         $timeclose = isset($current->timeclose)? $current->timeclose : $quiz->timeclose;
1202
1203         // Only add open/close events for an override if they differ from the quiz default.
1204         $addopen  = empty($current->id) || !empty($current->timeopen);
1205         $addclose = empty($current->id) || !empty($current->timeclose);
1206
1207         if (!empty($quiz->coursemodule)) {
1208             $cmid = $quiz->coursemodule;
1209         } else {
1210             $cmid = get_coursemodule_from_instance('quiz', $quiz->id, $quiz->course)->id;
1211         }
1212
1213         $event = new stdClass();
1214         $event->description = format_module_intro('quiz', $quiz, $cmid);
1215         // Events module won't show user events when the courseid is nonzero.
1216         $event->courseid    = ($userid) ? 0 : $quiz->course;
1217         $event->groupid     = $groupid;
1218         $event->userid      = $userid;
1219         $event->modulename  = 'quiz';
1220         $event->instance    = $quiz->id;
1221         $event->timestart   = $timeopen;
1222         $event->timeduration = max($timeclose - $timeopen, 0);
1223         $event->visible     = instance_is_visible('quiz', $quiz);
1224         $event->eventtype   = 'open';
1225
1226         // Determine the event name.
1227         if ($groupid) {
1228             $params = new stdClass();
1229             $params->quiz = $quiz->name;
1230             $params->group = groups_get_group_name($groupid);
1231             if ($params->group === false) {
1232                 // Group doesn't exist, just skip it.
1233                 continue;
1234             }
1235             $eventname = get_string('overridegroupeventname', 'quiz', $params);
1236         } else if ($userid) {
1237             $params = new stdClass();
1238             $params->quiz = $quiz->name;
1239             $eventname = get_string('overrideusereventname', 'quiz', $params);
1240         } else {
1241             $eventname = $quiz->name;
1242         }
1243         if ($addopen or $addclose) {
1244             if ($timeclose and $timeopen and $event->timeduration <= QUIZ_MAX_EVENT_LENGTH) {
1245                 // Single event for the whole quiz.
1246                 if ($oldevent = array_shift($oldevents)) {
1247                     $event->id = $oldevent->id;
1248                 } else {
1249                     unset($event->id);
1250                 }
1251                 $event->name = $eventname;
1252                 // The method calendar_event::create will reuse a db record if the id field is set.
1253                 calendar_event::create($event);
1254             } else {
1255                 // Separate start and end events.
1256                 $event->timeduration  = 0;
1257                 if ($timeopen && $addopen) {
1258                     if ($oldevent = array_shift($oldevents)) {
1259                         $event->id = $oldevent->id;
1260                     } else {
1261                         unset($event->id);
1262                     }
1263                     $event->name = $eventname.' ('.get_string('quizopens', 'quiz').')';
1264                     // The method calendar_event::create will reuse a db record if the id field is set.
1265                     calendar_event::create($event);
1266                 }
1267                 if ($timeclose && $addclose) {
1268                     if ($oldevent = array_shift($oldevents)) {
1269                         $event->id = $oldevent->id;
1270                     } else {
1271                         unset($event->id);
1272                     }
1273                     $event->name      = $eventname.' ('.get_string('quizcloses', 'quiz').')';
1274                     $event->timestart = $timeclose;
1275                     $event->eventtype = 'close';
1276                     calendar_event::create($event);
1277                 }
1278             }
1279         }
1280     }
1281
1282     // Delete any leftover events.
1283     foreach ($oldevents as $badevent) {
1284         $badevent = calendar_event::load($badevent);
1285         $badevent->delete();
1286     }
1287 }
1288
1289 /**
1290  * List the actions that correspond to a view of this module.
1291  * This is used by the participation report.
1292  *
1293  * Note: This is not used by new logging system. Event with
1294  *       crud = 'r' and edulevel = LEVEL_PARTICIPATING will
1295  *       be considered as view action.
1296  *
1297  * @return array
1298  */
1299 function quiz_get_view_actions() {
1300     return array('view', 'view all', 'report', 'review');
1301 }
1302
1303 /**
1304  * List the actions that correspond to a post of this module.
1305  * This is used by the participation report.
1306  *
1307  * Note: This is not used by new logging system. Event with
1308  *       crud = ('c' || 'u' || 'd') and edulevel = LEVEL_PARTICIPATING
1309  *       will be considered as post action.
1310  *
1311  * @return array
1312  */
1313 function quiz_get_post_actions() {
1314     return array('attempt', 'close attempt', 'preview', 'editquestions',
1315             'delete attempt', 'manualgrade');
1316 }
1317
1318 /**
1319  * @param array $questionids of question ids.
1320  * @return bool whether any of these questions are used by any instance of this module.
1321  */
1322 function quiz_questions_in_use($questionids) {
1323     global $DB, $CFG;
1324     require_once($CFG->libdir . '/questionlib.php');
1325     list($test, $params) = $DB->get_in_or_equal($questionids);
1326     return $DB->record_exists_select('quiz_slots',
1327             'questionid ' . $test, $params) || question_engine::questions_in_use(
1328             $questionids, new qubaid_join('{quiz_attempts} quiza',
1329             'quiza.uniqueid', 'quiza.preview = 0'));
1330 }
1331
1332 /**
1333  * Implementation of the function for printing the form elements that control
1334  * whether the course reset functionality affects the quiz.
1335  *
1336  * @param $mform the course reset form that is being built.
1337  */
1338 function quiz_reset_course_form_definition($mform) {
1339     $mform->addElement('header', 'quizheader', get_string('modulenameplural', 'quiz'));
1340     $mform->addElement('advcheckbox', 'reset_quiz_attempts',
1341             get_string('removeallquizattempts', 'quiz'));
1342 }
1343
1344 /**
1345  * Course reset form defaults.
1346  * @return array the defaults.
1347  */
1348 function quiz_reset_course_form_defaults($course) {
1349     return array('reset_quiz_attempts' => 1);
1350 }
1351
1352 /**
1353  * Removes all grades from gradebook
1354  *
1355  * @param int $courseid
1356  * @param string optional type
1357  */
1358 function quiz_reset_gradebook($courseid, $type='') {
1359     global $CFG, $DB;
1360
1361     $quizzes = $DB->get_records_sql("
1362             SELECT q.*, cm.idnumber as cmidnumber, q.course as courseid
1363             FROM {modules} m
1364             JOIN {course_modules} cm ON m.id = cm.module
1365             JOIN {quiz} q ON cm.instance = q.id
1366             WHERE m.name = 'quiz' AND cm.course = ?", array($courseid));
1367
1368     foreach ($quizzes as $quiz) {
1369         quiz_grade_item_update($quiz, 'reset');
1370     }
1371 }
1372
1373 /**
1374  * Actual implementation of the reset course functionality, delete all the
1375  * quiz attempts for course $data->courseid, if $data->reset_quiz_attempts is
1376  * set and true.
1377  *
1378  * Also, move the quiz open and close dates, if the course start date is changing.
1379  *
1380  * @param object $data the data submitted from the reset course.
1381  * @return array status array
1382  */
1383 function quiz_reset_userdata($data) {
1384     global $CFG, $DB;
1385     require_once($CFG->libdir . '/questionlib.php');
1386
1387     $componentstr = get_string('modulenameplural', 'quiz');
1388     $status = array();
1389
1390     // Delete attempts.
1391     if (!empty($data->reset_quiz_attempts)) {
1392         question_engine::delete_questions_usage_by_activities(new qubaid_join(
1393                 '{quiz_attempts} quiza JOIN {quiz} quiz ON quiza.quiz = quiz.id',
1394                 'quiza.uniqueid', 'quiz.course = :quizcourseid',
1395                 array('quizcourseid' => $data->courseid)));
1396
1397         $DB->delete_records_select('quiz_attempts',
1398                 'quiz IN (SELECT id FROM {quiz} WHERE course = ?)', array($data->courseid));
1399         $status[] = array(
1400             'component' => $componentstr,
1401             'item' => get_string('attemptsdeleted', 'quiz'),
1402             'error' => false);
1403
1404         // Remove all grades from gradebook.
1405         $DB->delete_records_select('quiz_grades',
1406                 'quiz IN (SELECT id FROM {quiz} WHERE course = ?)', array($data->courseid));
1407         if (empty($data->reset_gradebook_grades)) {
1408             quiz_reset_gradebook($data->courseid);
1409         }
1410         $status[] = array(
1411             'component' => $componentstr,
1412             'item' => get_string('gradesdeleted', 'quiz'),
1413             'error' => false);
1414     }
1415
1416     // Updating dates - shift may be negative too.
1417     if ($data->timeshift) {
1418         $DB->execute("UPDATE {quiz_overrides}
1419                          SET timeopen = timeopen + ?
1420                        WHERE quiz IN (SELECT id FROM {quiz} WHERE course = ?)
1421                          AND timeopen <> 0", array($data->timeshift, $data->courseid));
1422         $DB->execute("UPDATE {quiz_overrides}
1423                          SET timeclose = timeclose + ?
1424                        WHERE quiz IN (SELECT id FROM {quiz} WHERE course = ?)
1425                          AND timeclose <> 0", array($data->timeshift, $data->courseid));
1426
1427         shift_course_mod_dates('quiz', array('timeopen', 'timeclose'),
1428                 $data->timeshift, $data->courseid);
1429
1430         $status[] = array(
1431             'component' => $componentstr,
1432             'item' => get_string('openclosedatesupdated', 'quiz'),
1433             'error' => false);
1434     }
1435
1436     return $status;
1437 }
1438
1439 /**
1440  * Prints quiz summaries on MyMoodle Page
1441  * @param arry $courses
1442  * @param array $htmlarray
1443  */
1444 function quiz_print_overview($courses, &$htmlarray) {
1445     global $USER, $CFG;
1446     // These next 6 Lines are constant in all modules (just change module name).
1447     if (empty($courses) || !is_array($courses) || count($courses) == 0) {
1448         return array();
1449     }
1450
1451     if (!$quizzes = get_all_instances_in_courses('quiz', $courses)) {
1452         return;
1453     }
1454
1455     // Fetch some language strings outside the main loop.
1456     $strquiz = get_string('modulename', 'quiz');
1457     $strnoattempts = get_string('noattempts', 'quiz');
1458
1459     // We want to list quizzes that are currently available, and which have a close date.
1460     // This is the same as what the lesson does, and the dabate is in MDL-10568.
1461     $now = time();
1462     foreach ($quizzes as $quiz) {
1463         if ($quiz->timeclose >= $now && $quiz->timeopen < $now) {
1464             // Give a link to the quiz, and the deadline.
1465             $str = '<div class="quiz overview">' .
1466                     '<div class="name">' . $strquiz . ': <a ' .
1467                     ($quiz->visible ? '' : ' class="dimmed"') .
1468                     ' href="' . $CFG->wwwroot . '/mod/quiz/view.php?id=' .
1469                     $quiz->coursemodule . '">' .
1470                     $quiz->name . '</a></div>';
1471             $str .= '<div class="info">' . get_string('quizcloseson', 'quiz',
1472                     userdate($quiz->timeclose)) . '</div>';
1473
1474             // Now provide more information depending on the uers's role.
1475             $context = context_module::instance($quiz->coursemodule);
1476             if (has_capability('mod/quiz:viewreports', $context)) {
1477                 // For teacher-like people, show a summary of the number of student attempts.
1478                 // The $quiz objects returned by get_all_instances_in_course have the necessary $cm
1479                 // fields set to make the following call work.
1480                 $str .= '<div class="info">' .
1481                         quiz_num_attempt_summary($quiz, $quiz, true) . '</div>';
1482             } else if (has_any_capability(array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'),
1483                     $context)) { // Student
1484                 // For student-like people, tell them how many attempts they have made.
1485                 if (isset($USER->id) &&
1486                         ($attempts = quiz_get_user_attempts($quiz->id, $USER->id))) {
1487                     $numattempts = count($attempts);
1488                     $str .= '<div class="info">' .
1489                             get_string('numattemptsmade', 'quiz', $numattempts) . '</div>';
1490                 } else {
1491                     $str .= '<div class="info">' . $strnoattempts . '</div>';
1492                 }
1493             } else {
1494                 // For ayone else, there is no point listing this quiz, so stop processing.
1495                 continue;
1496             }
1497
1498             // Add the output for this quiz to the rest.
1499             $str .= '</div>';
1500             if (empty($htmlarray[$quiz->course]['quiz'])) {
1501                 $htmlarray[$quiz->course]['quiz'] = $str;
1502             } else {
1503                 $htmlarray[$quiz->course]['quiz'] .= $str;
1504             }
1505         }
1506     }
1507 }
1508
1509 /**
1510  * Return a textual summary of the number of attempts that have been made at a particular quiz,
1511  * returns '' if no attempts have been made yet, unless $returnzero is passed as true.
1512  *
1513  * @param object $quiz the quiz object. Only $quiz->id is used at the moment.
1514  * @param object $cm the cm object. Only $cm->course, $cm->groupmode and
1515  *      $cm->groupingid fields are used at the moment.
1516  * @param bool $returnzero if false (default), when no attempts have been
1517  *      made '' is returned instead of 'Attempts: 0'.
1518  * @param int $currentgroup if there is a concept of current group where this method is being called
1519  *         (e.g. a report) pass it in here. Default 0 which means no current group.
1520  * @return string a string like "Attempts: 123", "Attemtps 123 (45 from your groups)" or
1521  *          "Attemtps 123 (45 from this group)".
1522  */
1523 function quiz_num_attempt_summary($quiz, $cm, $returnzero = false, $currentgroup = 0) {
1524     global $DB, $USER;
1525     $numattempts = $DB->count_records('quiz_attempts', array('quiz'=> $quiz->id, 'preview'=>0));
1526     if ($numattempts || $returnzero) {
1527         if (groups_get_activity_groupmode($cm)) {
1528             $a = new stdClass();
1529             $a->total = $numattempts;
1530             if ($currentgroup) {
1531                 $a->group = $DB->count_records_sql('SELECT COUNT(DISTINCT qa.id) FROM ' .
1532                         '{quiz_attempts} qa JOIN ' .
1533                         '{groups_members} gm ON qa.userid = gm.userid ' .
1534                         'WHERE quiz = ? AND preview = 0 AND groupid = ?',
1535                         array($quiz->id, $currentgroup));
1536                 return get_string('attemptsnumthisgroup', 'quiz', $a);
1537             } else if ($groups = groups_get_all_groups($cm->course, $USER->id, $cm->groupingid)) {
1538                 list($usql, $params) = $DB->get_in_or_equal(array_keys($groups));
1539                 $a->group = $DB->count_records_sql('SELECT COUNT(DISTINCT qa.id) FROM ' .
1540                         '{quiz_attempts} qa JOIN ' .
1541                         '{groups_members} gm ON qa.userid = gm.userid ' .
1542                         'WHERE quiz = ? AND preview = 0 AND ' .
1543                         "groupid $usql", array_merge(array($quiz->id), $params));
1544                 return get_string('attemptsnumyourgroups', 'quiz', $a);
1545             }
1546         }
1547         return get_string('attemptsnum', 'quiz', $numattempts);
1548     }
1549     return '';
1550 }
1551
1552 /**
1553  * Returns the same as {@link quiz_num_attempt_summary()} but wrapped in a link
1554  * to the quiz reports.
1555  *
1556  * @param object $quiz the quiz object. Only $quiz->id is used at the moment.
1557  * @param object $cm the cm object. Only $cm->course, $cm->groupmode and
1558  *      $cm->groupingid fields are used at the moment.
1559  * @param object $context the quiz context.
1560  * @param bool $returnzero if false (default), when no attempts have been made
1561  *      '' is returned instead of 'Attempts: 0'.
1562  * @param int $currentgroup if there is a concept of current group where this method is being called
1563  *         (e.g. a report) pass it in here. Default 0 which means no current group.
1564  * @return string HTML fragment for the link.
1565  */
1566 function quiz_attempt_summary_link_to_reports($quiz, $cm, $context, $returnzero = false,
1567         $currentgroup = 0) {
1568     global $CFG;
1569     $summary = quiz_num_attempt_summary($quiz, $cm, $returnzero, $currentgroup);
1570     if (!$summary) {
1571         return '';
1572     }
1573
1574     require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');
1575     $url = new moodle_url('/mod/quiz/report.php', array(
1576             'id' => $cm->id, 'mode' => quiz_report_default_report($context)));
1577     return html_writer::link($url, $summary);
1578 }
1579
1580 /**
1581  * @param string $feature FEATURE_xx constant for requested feature
1582  * @return bool True if quiz supports feature
1583  */
1584 function quiz_supports($feature) {
1585     switch($feature) {
1586         case FEATURE_GROUPS:                    return true;
1587         case FEATURE_GROUPINGS:                 return true;
1588         case FEATURE_GROUPMEMBERSONLY:          return true;
1589         case FEATURE_MOD_INTRO:                 return true;
1590         case FEATURE_COMPLETION_TRACKS_VIEWS:   return true;
1591         case FEATURE_GRADE_HAS_GRADE:           return true;
1592         case FEATURE_GRADE_OUTCOMES:            return true;
1593         case FEATURE_BACKUP_MOODLE2:            return true;
1594         case FEATURE_SHOW_DESCRIPTION:          return true;
1595         case FEATURE_CONTROLS_GRADE_VISIBILITY: return true;
1596         case FEATURE_USES_QUESTIONS:            return true;
1597
1598         default: return null;
1599     }
1600 }
1601
1602 /**
1603  * @return array all other caps used in module
1604  */
1605 function quiz_get_extra_capabilities() {
1606     global $CFG;
1607     require_once($CFG->libdir . '/questionlib.php');
1608     $caps = question_get_all_capabilities();
1609     $caps[] = 'moodle/site:accessallgroups';
1610     return $caps;
1611 }
1612
1613 /**
1614  * This function extends the settings navigation block for the site.
1615  *
1616  * It is safe to rely on PAGE here as we will only ever be within the module
1617  * context when this is called
1618  *
1619  * @param settings_navigation $settings
1620  * @param navigation_node $quiznode
1621  * @return void
1622  */
1623 function quiz_extend_settings_navigation($settings, $quiznode) {
1624     global $PAGE, $CFG;
1625
1626     // Require {@link questionlib.php}
1627     // Included here as we only ever want to include this file if we really need to.
1628     require_once($CFG->libdir . '/questionlib.php');
1629
1630     // We want to add these new nodes after the Edit settings node, and before the
1631     // Locally assigned roles node. Of course, both of those are controlled by capabilities.
1632     $keys = $quiznode->get_children_key_list();
1633     $beforekey = null;
1634     $i = array_search('modedit', $keys);
1635     if ($i === false and array_key_exists(0, $keys)) {
1636         $beforekey = $keys[0];
1637     } else if (array_key_exists($i + 1, $keys)) {
1638         $beforekey = $keys[$i + 1];
1639     }
1640
1641     if (has_capability('mod/quiz:manageoverrides', $PAGE->cm->context)) {
1642         $url = new moodle_url('/mod/quiz/overrides.php', array('cmid'=>$PAGE->cm->id));
1643         $node = navigation_node::create(get_string('groupoverrides', 'quiz'),
1644                 new moodle_url($url, array('mode'=>'group')),
1645                 navigation_node::TYPE_SETTING, null, 'mod_quiz_groupoverrides');
1646         $quiznode->add_node($node, $beforekey);
1647
1648         $node = navigation_node::create(get_string('useroverrides', 'quiz'),
1649                 new moodle_url($url, array('mode'=>'user')),
1650                 navigation_node::TYPE_SETTING, null, 'mod_quiz_useroverrides');
1651         $quiznode->add_node($node, $beforekey);
1652     }
1653
1654     if (has_capability('mod/quiz:manage', $PAGE->cm->context)) {
1655         $node = navigation_node::create(get_string('editquiz', 'quiz'),
1656                 new moodle_url('/mod/quiz/edit.php', array('cmid'=>$PAGE->cm->id)),
1657                 navigation_node::TYPE_SETTING, null, 'mod_quiz_edit',
1658                 new pix_icon('t/edit', ''));
1659         $quiznode->add_node($node, $beforekey);
1660     }
1661
1662     if (has_capability('mod/quiz:preview', $PAGE->cm->context)) {
1663         $url = new moodle_url('/mod/quiz/startattempt.php',
1664                 array('cmid'=>$PAGE->cm->id, 'sesskey'=>sesskey()));
1665         $node = navigation_node::create(get_string('preview', 'quiz'), $url,
1666                 navigation_node::TYPE_SETTING, null, 'mod_quiz_preview',
1667                 new pix_icon('i/preview', ''));
1668         $quiznode->add_node($node, $beforekey);
1669     }
1670
1671     if (has_any_capability(array('mod/quiz:viewreports', 'mod/quiz:grade'), $PAGE->cm->context)) {
1672         require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');
1673         $reportlist = quiz_report_list($PAGE->cm->context);
1674
1675         $url = new moodle_url('/mod/quiz/report.php',
1676                 array('id' => $PAGE->cm->id, 'mode' => reset($reportlist)));
1677         $reportnode = $quiznode->add_node(navigation_node::create(get_string('results', 'quiz'), $url,
1678                 navigation_node::TYPE_SETTING,
1679                 null, null, new pix_icon('i/report', '')), $beforekey);
1680
1681         foreach ($reportlist as $report) {
1682             $url = new moodle_url('/mod/quiz/report.php',
1683                     array('id' => $PAGE->cm->id, 'mode' => $report));
1684             $reportnode->add_node(navigation_node::create(get_string($report, 'quiz_'.$report), $url,
1685                     navigation_node::TYPE_SETTING,
1686                     null, 'quiz_report_' . $report, new pix_icon('i/item', '')));
1687         }
1688     }
1689
1690     question_extend_settings_navigation($quiznode, $PAGE->cm->context)->trim_if_empty();
1691 }
1692
1693 /**
1694  * Serves the quiz files.
1695  *
1696  * @package  mod_quiz
1697  * @category files
1698  * @param stdClass $course course object
1699  * @param stdClass $cm course module object
1700  * @param stdClass $context context object
1701  * @param string $filearea file area
1702  * @param array $args extra arguments
1703  * @param bool $forcedownload whether or not force download
1704  * @param array $options additional options affecting the file serving
1705  * @return bool false if file not found, does not return if found - justsend the file
1706  */
1707 function quiz_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options=array()) {
1708     global $CFG, $DB;
1709
1710     if ($context->contextlevel != CONTEXT_MODULE) {
1711         return false;
1712     }
1713
1714     require_login($course, false, $cm);
1715
1716     if (!$quiz = $DB->get_record('quiz', array('id'=>$cm->instance))) {
1717         return false;
1718     }
1719
1720     // The 'intro' area is served by pluginfile.php.
1721     $fileareas = array('feedback');
1722     if (!in_array($filearea, $fileareas)) {
1723         return false;
1724     }
1725
1726     $feedbackid = (int)array_shift($args);
1727     if (!$feedback = $DB->get_record('quiz_feedback', array('id'=>$feedbackid))) {
1728         return false;
1729     }
1730
1731     $fs = get_file_storage();
1732     $relativepath = implode('/', $args);
1733     $fullpath = "/$context->id/mod_quiz/$filearea/$feedbackid/$relativepath";
1734     if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
1735         return false;
1736     }
1737     send_stored_file($file, 0, 0, true, $options);
1738 }
1739
1740 /**
1741  * Called via pluginfile.php -> question_pluginfile to serve files belonging to
1742  * a question in a question_attempt when that attempt is a quiz attempt.
1743  *
1744  * @package  mod_quiz
1745  * @category files
1746  * @param stdClass $course course settings object
1747  * @param stdClass $context context object
1748  * @param string $component the name of the component we are serving files for.
1749  * @param string $filearea the name of the file area.
1750  * @param int $qubaid the attempt usage id.
1751  * @param int $slot the id of a question in this quiz attempt.
1752  * @param array $args the remaining bits of the file path.
1753  * @param bool $forcedownload whether the user must be forced to download the file.
1754  * @param array $options additional options affecting the file serving
1755  * @return bool false if file not found, does not return if found - justsend the file
1756  */
1757 function quiz_question_pluginfile($course, $context, $component,
1758         $filearea, $qubaid, $slot, $args, $forcedownload, array $options=array()) {
1759     global $CFG;
1760     require_once($CFG->dirroot . '/mod/quiz/locallib.php');
1761
1762     $attemptobj = quiz_attempt::create_from_usage_id($qubaid);
1763     require_login($attemptobj->get_course(), false, $attemptobj->get_cm());
1764
1765     if ($attemptobj->is_own_attempt() && !$attemptobj->is_finished()) {
1766         // In the middle of an attempt.
1767         if (!$attemptobj->is_preview_user()) {
1768             $attemptobj->require_capability('mod/quiz:attempt');
1769         }
1770         $isreviewing = false;
1771
1772     } else {
1773         // Reviewing an attempt.
1774         $attemptobj->check_review_capability();
1775         $isreviewing = true;
1776     }
1777
1778     if (!$attemptobj->check_file_access($slot, $isreviewing, $context->id,
1779             $component, $filearea, $args, $forcedownload)) {
1780         send_file_not_found();
1781     }
1782
1783     $fs = get_file_storage();
1784     $relativepath = implode('/', $args);
1785     $fullpath = "/$context->id/$component/$filearea/$relativepath";
1786     if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->is_directory()) {
1787         send_file_not_found();
1788     }
1789
1790     send_stored_file($file, 0, 0, $forcedownload, $options);
1791 }
1792
1793 /**
1794  * Return a list of page types
1795  * @param string $pagetype current page type
1796  * @param stdClass $parentcontext Block's parent context
1797  * @param stdClass $currentcontext Current context of block
1798  */
1799 function quiz_page_type_list($pagetype, $parentcontext, $currentcontext) {
1800     $module_pagetype = array(
1801         'mod-quiz-*'       => get_string('page-mod-quiz-x', 'quiz'),
1802         'mod-quiz-view'    => get_string('page-mod-quiz-view', 'quiz'),
1803         'mod-quiz-attempt' => get_string('page-mod-quiz-attempt', 'quiz'),
1804         'mod-quiz-summary' => get_string('page-mod-quiz-summary', 'quiz'),
1805         'mod-quiz-review'  => get_string('page-mod-quiz-review', 'quiz'),
1806         'mod-quiz-edit'    => get_string('page-mod-quiz-edit', 'quiz'),
1807         'mod-quiz-report'  => get_string('page-mod-quiz-report', 'quiz'),
1808     );
1809     return $module_pagetype;
1810 }
1811
1812 /**
1813  * @return the options for quiz navigation.
1814  */
1815 function quiz_get_navigation_options() {
1816     return array(
1817         QUIZ_NAVMETHOD_FREE => get_string('navmethod_free', 'quiz'),
1818         QUIZ_NAVMETHOD_SEQ  => get_string('navmethod_seq', 'quiz')
1819     );
1820 }