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Editing: question.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/>.

/**
 * True-false question definition class.
 *
 * @package    qtype
 * @subpackage truefalse
 * @copyright  2009 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

require_once($CFG->dirroot . '/question/type/questionbase.php');

/**
 * Represents a true-false question.
 *
 * @copyright  2009 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_truefalse_question extends question_graded_automatically {
    public $rightanswer;
    public $truefeedback;
    public $falsefeedback;
    public $trueanswerid;
    public $falseanswerid;

/** @var int the format of the true feedback. */
    public $truefeedbackformat;

/** @var int the format of the false feedback. */
    public $falsefeedbackformat;

/** @var bool true to show the standard instruction, otherwise hide it. */
    public $showstandardinstruction;

public function get_expected_data() {
        return array('answer' => PARAM_INT);
    }

public function get_correct_response() {
        return array('answer' => (int) $this->rightanswer);
    }

public function summarise_response(array $response) {
        if (!array_key_exists('answer', $response)) {
            return null;
        } else if ($response['answer']) {
            return get_string('true', 'qtype_truefalse');
        } else {
            return get_string('false', 'qtype_truefalse');
        }
    }

public function un_summarise_response(string $summary) {
        if ($summary === get_string('true', 'qtype_truefalse')) {
            return ['answer' => '1'];
        } else if ($summary === get_string('false', 'qtype_truefalse')) {
            return ['answer' => '0'];
        } else {
            return [];
        }
    }

public function classify_response(array $response) {
        if (!array_key_exists('answer', $response)) {
            return array($this->id => question_classified_response::no_response());
        }
        list($fraction) = $this->grade_response($response);
        if ($response['answer']) {
            return array($this->id => new question_classified_response(1,
                    get_string('true', 'qtype_truefalse'), $fraction));
        } else {
            return array($this->id => new question_classified_response(0,
                    get_string('false', 'qtype_truefalse'), $fraction));
        }
    }

public function is_complete_response(array $response) {
        return array_key_exists('answer', $response);
    }

public function get_validation_error(array $response) {
        if ($this->is_gradable_response($response)) {
            return '';
        }
        return get_string('pleaseselectananswer', 'qtype_truefalse');
    }

public function is_same_response(array $prevresponse, array $newresponse) {
        return question_utils::arrays_same_at_key_missing_is_blank(
                $prevresponse, $newresponse, 'answer');
    }

public function grade_response(array $response) {
        if ($this->rightanswer == true && $response['answer'] == true) {
            $fraction = 1;
        } else if ($this->rightanswer == false && $response['answer'] == false) {
            $fraction = 1;
        } else {
            $fraction = 0;
        }
        return array($fraction, question_state::graded_state_for_fraction($fraction));
    }

public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) {
        if ($component == 'question' && $filearea == 'answerfeedback') {
            $answerid = reset($args); // Itemid is answer id.
            $response = $qa->get_last_qt_var('answer', '');
            return $options->feedback && (
                    ($answerid == $this->trueanswerid && $response) ||
                    ($answerid == $this->falseanswerid && $response !== ''));

} else {
            return parent::check_file_access($qa, $options, $component, $filearea,
                    $args, $forcedownload);
        }
    }

/**
     * Return the question settings that define this question as structured data.
     *
     * @param question_attempt $qa the current attempt for which we are exporting the settings.
     * @param question_display_options $options the question display options which say which aspects of the question
     * should be visible.
     * @return mixed structure representing the question settings. In web services, this will be JSON-encoded.
     */
    public function get_question_definition_for_external_rendering(question_attempt $qa, question_display_options $options) {
        // No need to return anything, external clients do not need additional information for rendering this question type.
        return null;
    }
}

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