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Editing: questiontype.php

<?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/>.

/**
 * Question type class for the true-false question type.
 *
 * @package    qtype
 * @subpackage truefalse
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

require_once($CFG->libdir . '/questionlib.php');

/**
 * The true-false question type class.
 *
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_truefalse extends question_type {
    public function save_question_options($question) {
        global $DB;
        $result = new stdClass();
        $context = $question->context;

// Fetch old answer ids so that we can reuse them.
        $oldanswers = $DB->get_records('question_answers',
                array('question' => $question->id), 'id ASC');

// Save the true answer - update an existing answer if possible.
        $answer = array_shift($oldanswers);
        if (!$answer) {
            $answer = new stdClass();
            $answer->question = $question->id;
            $answer->answer = '';
            $answer->feedback = '';
            $answer->id = $DB->insert_record('question_answers', $answer);
        }

$answer->answer   = get_string('true', 'qtype_truefalse');
        $answer->fraction = $question->correctanswer;
        $answer->feedback = $this->import_or_save_files($question->feedbacktrue,
                $context, 'question', 'answerfeedback', $answer->id);
        $answer->feedbackformat = $question->feedbacktrue['format'];
        $DB->update_record('question_answers', $answer);
        $trueid = $answer->id;

// Save the false answer - update an existing answer if possible.
        $answer = array_shift($oldanswers);
        if (!$answer) {
            $answer = new stdClass();
            $answer->question = $question->id;
            $answer->answer = '';
            $answer->feedback = '';
            $answer->id = $DB->insert_record('question_answers', $answer);
        }

$answer->answer   = get_string('false', 'qtype_truefalse');
        $answer->fraction = 1 - (int)$question->correctanswer;
        $answer->feedback = $this->import_or_save_files($question->feedbackfalse,
                $context, 'question', 'answerfeedback', $answer->id);
        $answer->feedbackformat = $question->feedbackfalse['format'];
        $DB->update_record('question_answers', $answer);
        $falseid = $answer->id;

// Delete any left over old answer records.
        $fs = get_file_storage();
        foreach ($oldanswers as $oldanswer) {
            $fs->delete_area_files($context->id, 'question', 'answerfeedback', $oldanswer->id);
            $DB->delete_records('question_answers', array('id' => $oldanswer->id));
        }

// Save question options in question_truefalse table.
        if ($options = $DB->get_record('question_truefalse', array('question' => $question->id))) {
            // No need to do anything, since the answer IDs won't have changed
            // But we'll do it anyway, just for robustness.
            $options->trueanswer  = $trueid;
            $options->falseanswer = $falseid;
            $options->showstandardinstruction = !empty($question->showstandardinstruction);
            $DB->update_record('question_truefalse', $options);
        } else {
            $options = new stdClass();
            $options->question    = $question->id;
            $options->trueanswer  = $trueid;
            $options->falseanswer = $falseid;
            $options->showstandardinstruction = !empty($question->showstandardinstruction);
            $DB->insert_record('question_truefalse', $options);
        }

$this->save_hints($question);

return true;
    }

public function save_defaults_for_new_questions(stdClass $fromform): void {
        parent::save_defaults_for_new_questions($fromform);
        $this->set_default_value('showstandardinstruction', $fromform->showstandardinstruction);
    }

/**
     * Loads the question type specific options for the question.
     */
    public function get_question_options($question) {
        global $DB, $OUTPUT;
        parent::get_question_options($question);
        // Get additional information from database
        // and attach it to the question object.
        if (!$question->options = $DB->get_record('question_truefalse',
                array('question' => $question->id))) {
            echo $OUTPUT->notification('Error: Missing question options!');
            return false;
        }
        // Load the answers.
        if (!$question->options->answers = $DB->get_records('question_answers',
                array('question' =>  $question->id), 'id ASC')) {
            echo $OUTPUT->notification('Error: Missing question answers for truefalse question ' .
                    $question->id . '!');
            return false;
        }

return true;
    }

protected function initialise_question_instance(question_definition $question, $questiondata) {
        parent::initialise_question_instance($question, $questiondata);
        $answers = $questiondata->options->answers;

/** @var qtype_truefalse_question $question */
        $question->rightanswer = $answers[$questiondata->options->trueanswer]->fraction > 0.99;
        $question->truefeedback =  $answers[$questiondata->options->trueanswer]->feedback;
        $question->falsefeedback = $answers[$questiondata->options->falseanswer]->feedback;
        $question->truefeedbackformat =
                $answers[$questiondata->options->trueanswer]->feedbackformat;
        $question->falsefeedbackformat =
                $answers[$questiondata->options->falseanswer]->feedbackformat;
        $question->trueanswerid =  $questiondata->options->trueanswer;
        $question->falseanswerid = $questiondata->options->falseanswer;
        $question->showstandardinstruction = $questiondata->options->showstandardinstruction;
    }

public function delete_question($questionid, $contextid) {
        global $DB;
        $DB->delete_records('question_truefalse', array('question' => $questionid));

parent::delete_question($questionid, $contextid);
    }

public function move_files($questionid, $oldcontextid, $newcontextid) {
        parent::move_files($questionid, $oldcontextid, $newcontextid);
        $this->move_files_in_answers($questionid, $oldcontextid, $newcontextid);
    }

protected function delete_files($questionid, $contextid) {
        parent::delete_files($questionid, $contextid);
        $this->delete_files_in_answers($questionid, $contextid);
    }

public function get_random_guess_score($questiondata) {
        return 0.5;
    }

public function get_possible_responses($questiondata) {
        return array(
            $questiondata->id => array(
                0 => new question_possible_response(get_string('false', 'qtype_truefalse'),
                        $questiondata->options->answers[
                        $questiondata->options->falseanswer]->fraction),
                1 => new question_possible_response(get_string('true', 'qtype_truefalse'),
                        $questiondata->options->answers[
                        $questiondata->options->trueanswer]->fraction),
                null => question_possible_response::no_response()
            )
        );
    }
}

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