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Editing: format.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/>.

/**
 * Missing word question importer.
 *
 * @package    qformat_missingword
 * @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();

/**
 * Missing word question importer.
 *
 * This Moodle class provides all functions necessary to import and export
 * one-correct-answer multiple choice questions in this format:
 *
 *    As soon as we begin to explore our body parts as infants
 *    we become students of {=anatomy and physiology ~reflexology
 *    ~science ~experiment}, and in a sense we remain students for life.
 *
 * Each answer is separated with a tilde ~, and the correct answer is
 * prefixed with an equals sign =
 *
 * Percentage weights can be included by following the tilde with the
 * desired percent.  Comments can be included for each choice by following
 * the comment with a hash mark ("#") and the comment.  Example:
 *
 *    This is {=the best answer#comment on the best answer ~75%a good
 *    answer#comment on the good answer ~a wrong one#comment on the bad answer}
 *
 * @copyright  1999 onwards Martin Dougiamas {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qformat_missingword extends qformat_default {

public function provide_import() {
        return true;
    }

/**
     * Validate the given file.
     *
     * For more expensive or detailed integrity checks.
     *
     * @param stored_file $file the file to check
     * @return string the error message that occurred while validating the given file
     */
    public function validate_file(stored_file $file): string {
        return $this->validate_is_utf8_file($file);
    }

public function readquestion($lines) {
        // Given an array of lines known to define a question in
        // this format, this function converts it into a question
        // object suitable for processing and insertion into Moodle.

$question = $this->defaultquestion();
        $comment = null; // Added by T Robb.
        $text = implode(" ", $lines);

// Find answer section.

$answerstart = strpos($text, "{");
        if ($answerstart === false) {
            $this->error(get_string('beginanswernotfound', 'qformat_missingword'), $text);
            return false;
        }

$answerfinish = strpos($text, "}");
        if ($answerfinish === false) {
            $this->error(get_string('endanswernotfound', 'qformat_missingword'), $text);
            return false;
        }

$answerlength = $answerfinish - $answerstart;
        $answertext = substr($text, $answerstart + 1, $answerlength - 1);

// Save the new question text.
        $question->questiontext = substr_replace($text, "_____", $answerstart, $answerlength+1);
        $question->name = $this->create_default_question_name($question->questiontext, get_string('questionname', 'question'));

// Parse the answers.
        $answertext = str_replace("=", "~=", $answertext);
        $answers = explode("~", $answertext);
        if (isset($answers[0])) {
            $answers[0] = trim($answers[0]);
        }
        if (empty($answers[0])) {
            array_shift($answers);
        }

$countanswers = count($answers);

switch ($countanswers) {
            case 0:  // Invalid question.
                $this->error(get_string('noanswerfound', 'qformat_missingword'), $answertext);
                return false;

case 1:
                $question->qtype = 'shortanswer';

$answer = trim($answers[0]);
                if ($answer[0] == "=") {
                    $answer = substr($answer, 1);
                }
                $question->answer[]   = $answer;
                $question->fraction[] = 1;
                $question->feedback[] = array('text' => '', 'format' => FORMAT_HTML);

return $question;

default:
                $question->qtype = 'multichoice';
                $question = $this->add_blank_combined_feedback($question);
                $question->single = 1; // Only one answer allowed.

foreach ($answers as $key => $answer) {
                    $answer = trim($answer);

// Tom's addition starts here.
                    $answeight = 0;
                    if (strspn($answer, "1234567890%") > 0) {
                        // Make sure that the percent sign is the last in the span.
                        if (strpos($answer, "%") == strspn($answer, "1234567890%") - 1) {
                            $answeight0 = substr($answer, 0, strspn($answer, "1234567890%"));
                            $answeight = round(($answeight0/100), 2);
                            $answer = substr($answer, (strspn($answer, "1234567890%")));
                        }
                    }
                    if ($answer[0] == "=") {
                        $answeight = 1;
                    }
                    // Remove the protective underscore for leading numbers in answers.
                    if ($answer[0] == "_") {
                        $answer = substr($answer, 1);
                    }
                    $answer = trim($answer);

if (strpos($answer, "#") > 0) {
                        $hashpos = strpos($answer, "#");
                        $comment = substr(($answer), $hashpos+1);
                        $answer  = substr($answer, 0, $hashpos);
                    } else {
                        $comment = " ";
                    }
                    // End of Tom's addition.

if ($answer[0] == "=") {
                        $question->fraction[$key] = $answeight;
                        $answer = substr($answer, 1);
                    } else {
                        $question->fraction[$key] = $answeight;
                    }
                    $question->answer[$key]   = array('text' => $answer, 'format' => FORMAT_HTML);
                    $question->feedback[$key] = array('text' => $comment, 'format' => FORMAT_HTML);
                }

return $question;
        }
    }
}

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