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See Release Notes

  • Bug fixes for general core bugs in 4.2.x will end 22 April 2024 (12 months).
  • Bug fixes for security issues in 4.2.x will end 7 October 2024 (18 months).
  • PHP version: minimum PHP 8.0.0 Note: minimum PHP version has increased since Moodle 4.1. PHP 8.1.x is supported too.
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * This file contains classes for handling the different question behaviours
 * during upgrade.
 *
 * @package    moodlecore
 * @subpackage questionengine
 * @copyright  2010 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */


defined('MOODLE_INTERNAL') || die();


/**
 * Base class for managing the upgrade of a question using a particular behaviour.
 *
 * This class takes as input:
 * 1. Various backgroud data like $quiz, $attempt and $question.
 * 2. The data about the question session to upgrade $qsession and $qstates.
 * Working through that data, it builds up
 * 3. The equivalent new data $qa. This has roughly the same data as a
 * question_attempt object belonging to the new question engine would have, but
 * $this->qa is built up from stdClass objects.
 *
 * @copyright  2010 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
abstract class question_behaviour_attempt_updater {
    /** @var question_qtype_attempt_updater */
    protected $qtypeupdater;
    /** @var question_engine_assumption_logger */
    protected $logger;
    /** @var question_engine_attempt_upgrader */
    protected $qeupdater;

    /**
     * @var object this is the data for the upgraded questions attempt that
     * we are building.
     */
    public $qa;

    /** @var object the quiz settings. */
    protected $quiz;
    /** @var object the quiz attempt data. */
    protected $attempt;
    /** @var object the question definition data. */
    protected $question;
    /** @var object the question session to be upgraded. */
    protected $qsession;
    /** @var array the question states for the session to be upgraded. */
    protected $qstates;
> /** @var stdClass */ > protected $startstate;
/** * @var int counts the question_steps as they are converted to * question_attempt_steps. */ protected $sequencenumber; /** @var object pointer to the state that has already finished this attempt. */ protected $finishstate; public function __construct($quiz, $attempt, $question, $qsession, $qstates, $logger, $qeupdater) { $this->quiz = $quiz; $this->attempt = $attempt; $this->question = $question; $this->qsession = $qsession; $this->qstates = $qstates; $this->logger = $logger; $this->qeupdater = $qeupdater; } public function discard() { // Help the garbage collector, which seems to be struggling. $this->quiz = null; $this->attempt = null; $this->question = null; $this->qsession = null; $this->qstates = null; $this->qa = null; $this->qtypeupdater->discard(); $this->qtypeupdater = null; $this->logger = null; $this->qeupdater = null; } protected abstract function behaviour_name(); public function get_converted_qa() { $this->initialise_qa(); $this->convert_steps(); return $this->qa; } protected function create_missing_first_step() { $step = new stdClass(); $step->state = 'todo'; $step->data = array(); $step->fraction = null; $step->timecreated = $this->attempt->timestart ? $this->attempt->timestart : time(); $step->userid = $this->attempt->userid; $this->qtypeupdater->supply_missing_first_step_data($step->data); return $step; } public function supply_missing_qa() { $this->initialise_qa(); $this->qa->timemodified = $this->attempt->timestart; $this->sequencenumber = 0; $this->add_step($this->create_missing_first_step()); return $this->qa; } protected function initialise_qa() { $this->qtypeupdater = $this->make_qtype_updater(); $qa = new stdClass(); $qa->questionid = $this->question->id; $qa->variant = 1; $qa->behaviour = $this->behaviour_name(); $qa->questionsummary = $this->qtypeupdater->question_summary($this->question); $qa->rightanswer = $this->qtypeupdater->right_answer($this->question); $qa->maxmark = $this->question->maxmark; $qa->minfraction = 0; $qa->maxfraction = 1; $qa->flagged = 0; $qa->responsesummary = ''; $qa->timemodified = 0; $qa->steps = array(); $this->qa = $qa; } protected function convert_steps() { $this->finishstate = null; $this->startstate = null; $this->sequencenumber = 0; foreach ($this->qstates as $state) { $this->process_state($state); } $this->finish_up(); } protected function process_state($state) { $step = $this->make_step($state); $method = 'process' . $state->event; $this->$method($step, $state); } protected function finish_up() { } protected function add_step($step) { $step->sequencenumber = $this->sequencenumber; $this->qa->steps[] = $step; $this->sequencenumber++; } protected function discard_last_state() { array_pop($this->qa->steps); $this->sequencenumber--; } protected function unexpected_event($state) { throw new coding_exception("Unexpected event {$state->event} in state {$state->id} in question session {$this->qsession->id}."); } protected function process0($step, $state) { if ($this->startstate) { if ($state->answer == reset($this->qstates)->answer) { return; } else if ($this->quiz->attemptonlast && $this->sequencenumber == 1) { // There was a bug in attemptonlast in the past, which meant that // it created two inconsistent open states, with the second taking // priority. Simulate that be discarding the first open state, then // continuing. $this->logger->log_assumption("Ignoring bogus state in attempt at question {$state->question}"); $this->sequencenumber = 0; $this->qa->steps = array(); } else if ($this->qtypeupdater->is_blank_answer($state)) { $this->logger->log_assumption("Ignoring second start state with blank answer in attempt at question {$state->question}"); return; } else { throw new coding_exception("Two inconsistent open states for question session {$this->qsession->id}."); } } $step->state = 'todo'; $this->startstate = $state; $this->add_step($step); } protected function process1($step, $state) { $this->unexpected_event($state); } protected function process2($step, $state) { if ($this->qtypeupdater->was_answered($state)) { $step->state = 'complete'; } else { $step->state = 'todo'; } $this->add_step($step); } protected function process3($step, $state) { return $this->process6($step, $state); } protected function process4($step, $state) { $this->unexpected_event($state); } protected function process5($step, $state) { $this->unexpected_event($state); } protected abstract function process6($step, $state); protected abstract function process7($step, $state); protected function process8($step, $state) { return $this->process6($step, $state); } protected function process9($step, $state) { if (!$this->finishstate) { $submitstate = clone($state); $submitstate->event = 8; $submitstate->grade = 0; $this->process_state($submitstate); } $step->data['-comment'] = $this->qsession->manualcomment; if ($this->question->maxmark > 0) { $step->fraction = $state->grade / $this->question->maxmark; $step->state = $this->manual_graded_state_for_fraction($step->fraction); $step->data['-mark'] = $state->grade; $step->data['-maxmark'] = $this->question->maxmark; } else { $step->state = 'manfinished'; } unset($step->data['answer']); $step->userid = null; $this->add_step($step); } /** * @param object $question a question definition * @return qtype_updater */ protected function make_qtype_updater() { global $CFG; if ($this->question->qtype == 'deleted') { return new question_deleted_question_attempt_updater( $this, $this->question, $this->logger, $this->qeupdater); } $path = $CFG->dirroot . '/question/type/' . $this->question->qtype . '/db/upgradelib.php'; if (!is_readable($path)) { throw new coding_exception("Question type {$this->question->qtype} is missing important code (the file {$path}) required to run the upgrade to the new question engine."); } include_once($path); $class = 'qtype_' . $this->question->qtype . '_qe2_attempt_updater'; if (!class_exists($class)) { throw new coding_exception("Question type {$this->question->qtype} is missing important code (the class {$class}) required to run the upgrade to the new question engine."); } return new $class($this, $this->question, $this->logger, $this->qeupdater); } public function to_text($html) { return trim(html_to_text($html, 0, false)); } protected function graded_state_for_fraction($fraction) { if ($fraction < 0.000001) { return 'gradedwrong'; } else if ($fraction > 0.999999) { return 'gradedright'; } else { return 'gradedpartial'; } } protected function manual_graded_state_for_fraction($fraction) { if ($fraction < 0.000001) { return 'mangrwrong'; } else if ($fraction > 0.999999) { return 'mangrright'; } else { return 'mangrpartial'; } } protected function make_step($state){ $step = new stdClass(); $step->data = array(); if ($state->event == 0 || $this->sequencenumber == 0) { $this->qtypeupdater->set_first_step_data_elements($state, $step->data); } else { $this->qtypeupdater->set_data_elements_for_step($state, $step->data); } $step->fraction = null; $step->timecreated = $state->timestamp ? $state->timestamp : time(); $step->userid = $this->attempt->userid; $summary = $this->qtypeupdater->response_summary($state); if (!is_null($summary)) { $this->qa->responsesummary = $summary; } $this->qa->timemodified = max($this->qa->timemodified, $state->timestamp); return $step; } } class qbehaviour_deferredfeedback_converter extends question_behaviour_attempt_updater {
>
protected function behaviour_name() { return 'deferredfeedback'; } protected function process6($step, $state) { if (!$this->startstate) { $this->logger->log_assumption("Ignoring bogus submit before open in attempt at question {$state->question}"); // WTF, but this has happened a few times in our DB. It seems it is safe to ignore. return; } if ($this->finishstate) { if ($this->finishstate->answer != $state->answer || $this->finishstate->grade != $state->grade || $this->finishstate->raw_grade != $state->raw_grade || $this->finishstate->penalty != $state->penalty) { $this->logger->log_assumption("Two inconsistent finish states found for question session {$this->qsession->id} in attempt at question {$state->question} keeping the later one."); $this->discard_last_state(); } else { $this->logger->log_assumption("Ignoring extra finish states in attempt at question {$state->question}"); return; } } if ($this->question->maxmark > 0) { $step->fraction = $state->grade / $this->question->maxmark; $step->state = $this->graded_state_for_fraction($step->fraction); } else { $step->state = 'finished'; } $step->data['-finish'] = '1'; $this->finishstate = $state; $this->add_step($step); } protected function process7($step, $state) { $this->unexpected_event($state); } } class qbehaviour_manualgraded_converter extends question_behaviour_attempt_updater { protected function behaviour_name() { return 'manualgraded'; } protected function process6($step, $state) { $step->state = 'needsgrading'; if (!$this->finishstate) { $step->data['-finish'] = '1'; $this->finishstate = $state; } $this->add_step($step); } protected function process7($step, $state) { return $this->process2($step, $state); } } class qbehaviour_informationitem_converter extends question_behaviour_attempt_updater {
>
protected function behaviour_name() { return 'informationitem'; } protected function process0($step, $state) { if ($this->startstate) { return; } $step->state = 'todo'; $this->startstate = $state; $this->add_step($step); } protected function process2($step, $state) { $this->unexpected_event($state); } protected function process3($step, $state) { $this->unexpected_event($state); } protected function process6($step, $state) { if ($this->finishstate) { return; } $step->state = 'finished'; $step->data['-finish'] = '1'; $this->finishstate = $state; $this->add_step($step); } protected function process7($step, $state) { return $this->process6($step, $state); } protected function process8($step, $state) { return $this->process6($step, $state); } } class qbehaviour_adaptive_converter extends question_behaviour_attempt_updater { protected $try; protected $laststepwasatry = false; protected $finished = false; protected $bestrawgrade = 0; protected function behaviour_name() { return 'adaptive'; } protected function finish_up() { parent::finish_up(); if ($this->finishstate || !$this->attempt->timefinish) { return; } $state = end($this->qstates); $step = $this->make_step($state); $this->process6($step, $state); } protected function process0($step, $state) { $this->try = 1; $this->laststepwasatry = false; parent::process0($step, $state); } protected function process2($step, $state) { if ($this->finishstate) { $this->logger->log_assumption("Ignoring bogus save after submit in an " . "adaptive attempt at question {$state->question} " . "(question session {$this->qsession->id})"); return; } if ($this->question->maxmark > 0) { $step->fraction = $state->grade / $this->question->maxmark; } $this->laststepwasatry = false; parent::process2($step, $state); } protected function process3($step, $state) { if ($this->question->maxmark > 0) { $step->fraction = $state->grade / $this->question->maxmark; if ($this->graded_state_for_fraction($step->fraction) == 'gradedright') { $step->state = 'complete'; } else { $step->state = 'todo'; } } else { $step->state = 'complete'; } $this->bestrawgrade = max($state->raw_grade, $this->bestrawgrade); $step->data['-_try'] = $this->try; $this->try += 1; $this->laststepwasatry = true; if ($this->question->maxmark > 0) { $step->data['-_rawfraction'] = $state->raw_grade / $this->question->maxmark; } else { $step->data['-_rawfraction'] = 0; } $step->data['-submit'] = 1; $this->add_step($step); } protected function process6($step, $state) { if ($this->finishstate) { if (!$this->qtypeupdater->compare_answers($this->finishstate->answer, $state->answer) || $this->finishstate->grade != $state->grade || $this->finishstate->raw_grade != $state->raw_grade || $this->finishstate->penalty != $state->penalty) { throw new coding_exception("Two inconsistent finish states found for question session {$this->qsession->id}."); } else { $this->logger->log_assumption("Ignoring extra finish states in attempt at question {$state->question}"); return; } } $this->bestrawgrade = max($state->raw_grade, $this->bestrawgrade); if ($this->question->maxmark > 0) { $step->fraction = $state->grade / $this->question->maxmark; $step->state = $this->graded_state_for_fraction( $this->bestrawgrade / $this->question->maxmark); } else { $step->state = 'finished'; } $step->data['-finish'] = 1; if ($this->laststepwasatry) { $this->try -= 1; } $step->data['-_try'] = $this->try; if ($this->question->maxmark > 0) { $step->data['-_rawfraction'] = $state->raw_grade / $this->question->maxmark; } else { $step->data['-_rawfraction'] = 0; } $this->finishstate = $state; $this->add_step($step); } protected function process7($step, $state) { $this->unexpected_event($state); } } class qbehaviour_adaptivenopenalty_converter extends qbehaviour_adaptive_converter { protected function behaviour_name() { return 'adaptivenopenalty'; } }