class.assTextQuestion.php

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<?php
 
require_once './Modules/TestQuestionPool/classes/class.assQuestion.php';
require_once './Modules/Test/classes/inc.AssessmentConstants.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilObjQuestionScoringAdjustable.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilObjAnswerScoringAdjustable.php';
 
class assTextQuestion extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable
{
    protected const HAS_SPECIFIC_FEEDBACK = false;
    public $maxNumOfChars;
 
    protected $wordCounterEnabled;
 
    public $keywords;
 
    public $answers;
 
    public $text_rating;
 
    /* method for automatic string matching */
    private $matchcondition;
 
    public $keyword_relation = 'any';
 
    public function __construct(
        $title = "",
        $comment = "",
        $author = "",
        $owner = -1,
        $question = ""
    ) {
        parent::__construct($title, $comment, $author, $owner, $question);
        $this->wordCounterEnabled = false;
        $this->maxNumOfChars = 0;
        $this->points = 1;
        $this->answers = array();
        $this->matchcondition = 0;
    }
 
    public function getMatchcondition(): int
    {
        return $this->matchcondition;
    }
 
    public function setMatchcondition(int $matchcondition): void
    {
        $this->matchcondition = $matchcondition;
    }
 
    public function isComplete(): bool
    {
        if (strlen($this->title)
            && $this->author
            && $this->question
            && $this->getMaximumPoints() > 0
        ) {
            return true;
        }
        return false;
    }
 
    public function saveToDb($original_id = ""): void
    {
        if ($original_id == '') {
            $this->saveQuestionDataToDb();
        } else {
            $this->saveQuestionDataToDb($original_id);
        }
 
        $this->saveAdditionalQuestionDataToDb();
        $this->saveAnswerSpecificDataToDb();
        parent::saveToDb();
    }
 
    public function loadFromDb($question_id): void
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        $result = $ilDB->queryF(
            "SELECT qpl_questions.*, " . $this->getAdditionalTableName() . ".* FROM qpl_questions LEFT JOIN " . $this->getAdditionalTableName() . " ON " . $this->getAdditionalTableName() . ".question_fi = qpl_questions.question_id WHERE qpl_questions.question_id = %s",
            array("integer"),
            array($question_id)
        );
        if ($ilDB->numRows($result) == 1) {
            $data = $ilDB->fetchAssoc($result);
            $this->setId($question_id);
            $this->setObjId($data["obj_fi"]);
            $this->setTitle((string) $data["title"]);
            $this->setComment((string) $data["description"]);
            $this->setOriginalId($data["original_id"]);
            $this->setNrOfTries($data['nr_of_tries']);
            $this->setAuthor($data["author"]);
            $this->setPoints((float) $data["points"]);
            $this->setOwner($data["owner"]);
            include_once("./Services/RTE/classes/class.ilRTE.php");
            $this->setQuestion(ilRTE::_replaceMediaObjectImageSrc((string) $data["question_text"], 1));
            $this->setShuffle(false);
            $this->setWordCounterEnabled((bool) $data['word_cnt_enabled']);
            $this->setMaxNumOfChars($data["maxnumofchars"]);
            $this->setTextRating($this->isValidTextRating($data["textgap_rating"]) ? $data["textgap_rating"] : TEXTGAP_RATING_CASEINSENSITIVE);
            $this->matchcondition = (strlen($data['matchcondition'])) ? (int) $data['matchcondition'] : 0;
            $this->setKeywordRelation(($data['keyword_relation']));
 
            try {
                $this->setLifecycle(ilAssQuestionLifecycle::getInstance($data['lifecycle']));
            } catch (ilTestQuestionPoolInvalidArgumentException $e) {
                $this->setLifecycle(ilAssQuestionLifecycle::getDraftInstance());
            }
 
            try {
                $this->setAdditionalContentEditingMode($data['add_cont_edit_mode']);
            } catch (ilTestQuestionPoolException $e) {
            }
        }
 
        $result = $ilDB->queryF(
            "SELECT * FROM qpl_a_essay WHERE question_fi = %s",
            array("integer"),
            array($this->getId())
        );
 
        $this->flushAnswers();
        while ($row = $ilDB->fetchAssoc($result)) {
            $this->addAnswer($row['answertext'], $row['points']);
        }
 
        parent::loadFromDb($question_id);
    }
 
    public function duplicate(bool $for_test = true, string $title = "", string $author = "", string $owner = "", $testObjId = null): int
    {
        if ($this->id <= 0) {
            // The question has not been saved. It cannot be duplicated
            return -1;
        }
        // duplicate the question in database
        $this_id = $this->getId();
        $thisObjId = $this->getObjId();
 
        $clone = $this;
        include_once("./Modules/TestQuestionPool/classes/class.assQuestion.php");
        $original_id = assQuestion::_getOriginalId($this->id);
        $clone->id = -1;
 
        if ((int) $testObjId > 0) {
            $clone->setObjId($testObjId);
        }
 
        if ($title) {
            $clone->setTitle($title);
        }
 
        if ($author) {
            $clone->setAuthor($author);
        }
        if ($owner) {
            $clone->setOwner($owner);
        }
 
        if ($for_test) {
            $clone->saveToDb($original_id);
        } else {
            $clone->saveToDb();
        }
 
        // copy question page content
        $clone->copyPageOfQuestion($this_id);
        // copy XHTML media objects
        $clone->copyXHTMLMediaObjectsOfQuestion($this_id);
        #$clone->duplicateAnswers($this_id);
 
        $clone->onDuplicate($thisObjId, $this_id, $clone->getObjId(), $clone->getId());
 
        return $clone->id;
    }
 
    public function copyObject($target_questionpool_id, $title = ""): int
    {
        if ($this->getId() <= 0) {
            throw new RuntimeException('The question has not been saved. It cannot be duplicated');
        }
        // duplicate the question in database
        $clone = $this;
        include_once("./Modules/TestQuestionPool/classes/class.assQuestion.php");
        $original_id = assQuestion::_getOriginalId($this->id);
        $clone->id = -1;
        $source_questionpool_id = $this->getObjId();
        $clone->setObjId($target_questionpool_id);
        if ($title) {
            $clone->setTitle($title);
        }
        $clone->saveToDb();
        // copy question page content
        $clone->copyPageOfQuestion($original_id);
        // copy XHTML media objects
        $clone->copyXHTMLMediaObjectsOfQuestion($original_id);
        // duplicate answers
        #$clone->duplicateAnswers($original_id);
 
        $clone->onCopy($source_questionpool_id, $original_id, $clone->getObjId(), $clone->getId());
 
        return $clone->id;
    }
 
    public function createNewOriginalFromThisDuplicate($targetParentId, $targetQuestionTitle = ""): int
    {
        if ($this->getId() <= 0) {
            throw new RuntimeException('The question has not been saved. It cannot be duplicated');
        }
 
        include_once("./Modules/TestQuestionPool/classes/class.assQuestion.php");
 
        $sourceQuestionId = $this->id;
        $sourceParentId = $this->getObjId();
 
        // duplicate the question in database
        $clone = $this;
        $clone->id = -1;
 
        $clone->setObjId($targetParentId);
 
        if ($targetQuestionTitle) {
            $clone->setTitle($targetQuestionTitle);
        }
 
        $clone->saveToDb();
        // copy question page content
        $clone->copyPageOfQuestion($sourceQuestionId);
        // copy XHTML media objects
        $clone->copyXHTMLMediaObjectsOfQuestion($sourceQuestionId);
        // duplicate answers
        #$clone->duplicateAnswers($sourceQuestionId);
 
        $clone->onCopy($sourceParentId, $sourceQuestionId, $clone->getObjId(), $clone->getId());
 
        return $clone->id;
    }
 
    public function getMaxNumOfChars(): int
    {
        if (strcmp($this->maxNumOfChars, "") == 0) {
            return 0;
        } else {
            return $this->maxNumOfChars;
        }
    }
 
    public function setMaxNumOfChars($maxchars = 0): void
    {
        $this->maxNumOfChars = $maxchars;
    }
 
    public function isWordCounterEnabled(): bool
    {
        return $this->wordCounterEnabled;
    }
 
    public function setWordCounterEnabled($wordCounterEnabled): void
    {
        $this->wordCounterEnabled = $wordCounterEnabled;
    }
 
    public function getMaximumPoints(): float
    {
        if (in_array($this->getKeywordRelation(), self::getScoringModesWithPointsByQuestion())) {
            return parent::getPoints();
        }
 
        $points = 0;
 
        foreach ($this->answers as $answer) {
            if ($answer->getPoints() > 0) {
                $points = $points + $answer->getPoints();
            }
        }
 
        return $points;
    }
 
    public function getMinimumPoints()
    {
        if (in_array($this->getKeywordRelation(), self::getScoringModesWithPointsByQuestion())) {
            return 0;
        }
 
        $points = 0;
 
        foreach ($this->answers as $answer) {
            if ($answer->getPoints() < 0) {
                $points = $points + $answer->getPoints();
            }
        }
 
        return $points;
    }
    public function setReachedPoints($active_id, $points, $pass = null): bool
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        if (($points > 0) && ($points <= $this->getPoints())) {
            if (is_null($pass)) {
                $pass = $this->getSolutionMaxPass($active_id);
            }
            $affectedRows = $ilDB->manipulateF(
                "UPDATE tst_test_result SET points = %s WHERE active_fi = %s AND question_fi = %s AND pass = %s",
                array('float','integer','integer','integer'),
                array($points, $active_id, $this->getId(), $pass)
            );
            self::_updateTestPassResults($active_id, $pass);
            return true;
        } else {
            return true;
        }
    }
 
    private function isValidTextRating($textRating): bool
    {
        switch ($textRating) {
            case TEXTGAP_RATING_CASEINSENSITIVE:
            case TEXTGAP_RATING_CASESENSITIVE:
            case TEXTGAP_RATING_LEVENSHTEIN1:
            case TEXTGAP_RATING_LEVENSHTEIN2:
            case TEXTGAP_RATING_LEVENSHTEIN3:
            case TEXTGAP_RATING_LEVENSHTEIN4:
            case TEXTGAP_RATING_LEVENSHTEIN5:
                return true;
        }
 
        return false;
    }
 
    public function isKeywordMatching($answertext, $a_keyword): bool
    {
        global $DIC;
        $refinery = $DIC->refinery();
        $result = false;
        $textrating = $this->getTextRating();
        include_once "./Services/Utilities/classes/class.ilStr.php";
 
        switch ($textrating) {
            case TEXTGAP_RATING_CASEINSENSITIVE:
                if (ilStr::strPos(ilStr::strToLower($answertext), ilStr::strToLower($a_keyword)) !== false) {
                    return true;
                }
                break;
            case TEXTGAP_RATING_CASESENSITIVE:
                if (ilStr::strPos($answertext, $a_keyword) !== false) {
                    return true;
                }
                break;
        }
 
        // "<p>red</p>" would not match "red" even with distance of 5
        $answertext = strip_tags($answertext);
        $answerwords = array();
        if (preg_match_all("/([^\s.]+)/", $answertext, $matches)) {
            foreach ($matches[1] as $answerword) {
                array_push($answerwords, trim($answerword));
            }
        }
 
        // create correct transformation
        switch ($textrating) {
            case TEXTGAP_RATING_LEVENSHTEIN1:
                $transformation = $refinery->string()->levenshtein()->standard($a_keyword, 1);
                break;
            case TEXTGAP_RATING_LEVENSHTEIN2:
                $transformation = $refinery->string()->levenshtein()->standard($a_keyword, 2);
                break;
            case TEXTGAP_RATING_LEVENSHTEIN3:
                $transformation = $refinery->string()->levenshtein()->standard($a_keyword, 3);
                break;
            case TEXTGAP_RATING_LEVENSHTEIN4:
                $transformation = $refinery->string()->levenshtein()->standard($a_keyword, 4);
                break;
            case TEXTGAP_RATING_LEVENSHTEIN5:
                $transformation = $refinery->string()->levenshtein()->standard($a_keyword, 5);
                break;
        }
 
        // run answers against Levenshtein methods
        foreach ($answerwords as $a_original) {
            if (isset($transformation) && $transformation->transform($a_original) >= 0) {
                return true;
            }
        }
        return $result;
    }
 
    protected function calculateReachedPointsForSolution($solution)
    {
        $solution = html_entity_decode($solution);
        // Return min points when keyword relation is NON KEYWORDS
        if ($this->getKeywordRelation() == 'non') {
            return $this->getMinimumPoints();
        }
 
        // Return min points if there are no answers present.
        $answers = $this->getAnswers();
 
        if (count($answers) == 0) {
            return $this->getMinimumPoints();
        }
 
        switch ($this->getKeywordRelation()) {
            case 'any':
                $points = 0;
                foreach ($answers as $answer) {
                    $qst_answer = $answer->getAnswertext();
                    $user_answer = '  ' . $solution;
                    if ($this->isKeywordMatching($user_answer, $qst_answer)) {
                        $points += $answer->getPoints();
                    }
                }
                break;
 
            case 'all':
                $points = $this->getMaximumPoints();
                foreach ($answers as $answer) {
                    $qst_answer = $answer->getAnswertext();
                    $user_answer = '  ' . $solution;
                    if (!$this->isKeywordMatching($user_answer, $qst_answer)) {
                        $points = 0;
                        break;
                    }
                }
                break;
 
            case 'one':
                $points = 0;
                foreach ($answers as $answer) {
                    $qst_answer = $answer->getAnswertext();
                    $user_answer = '  ' . $solution;
                    if ($this->isKeywordMatching($user_answer, $qst_answer)) {
                        $points = $this->getMaximumPoints();
                        break;
                    }
                }
                break;
        }
 
        return $points;
    }
 
    public function calculateReachedPoints($active_id, $pass = null, $authorizedSolution = true, $returndetails = false)
    {
        if ($returndetails) {
            throw new ilTestException('return details not implemented for ' . __METHOD__);
        }
 
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        if (is_null($pass)) {
            $pass = $this->getSolutionMaxPass($active_id);
        }
 
        $result = $this->getCurrentSolutionResultSet($active_id, $pass, $authorizedSolution);
 
        // Return min points when no answer was given.
        if ($ilDB->numRows($result) == 0) {
            return $this->getMinimumPoints();
        }
 
        // Return points of points are already on the row.
        $row = $ilDB->fetchAssoc($result);
        if ($row["points"] != null) {
            return $row["points"];
        }
 
        return $this->calculateReachedPointsForSolution($row['value1']);
    }
 
    public function saveWorkingData($active_id, $pass = null, $authorized = true): bool
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
        $ilUser = $DIC['ilUser'];
 
        include_once "./Services/Utilities/classes/class.ilStr.php";
        if (is_null($pass)) {
            include_once "./Modules/Test/classes/class.ilObjTest.php";
            $pass = ilObjTest::_getPass($active_id);
        }
 
        $entered_values = 0;
        $text = $this->getSolutionSubmit();
 
        $this->getProcessLocker()->executeUserSolutionUpdateLockOperation(function () use (&$entered_values, $active_id, $pass, $authorized, $text) {
            $this->removeCurrentSolution($active_id, $pass, $authorized);
 
            if (strlen($text)) {
                $this->saveCurrentSolution($active_id, $pass, trim($text), null, $authorized);
                $entered_values++;
            }
        });
 
        if ($entered_values) {
            include_once("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
            if (ilObjAssessmentFolder::_enabledAssessmentLogging()) {
                assQuestion::logAction($this->lng->txtlng(
                    "assessment",
                    "log_user_entered_values",
                    ilObjAssessmentFolder::_getLogLanguage()
                ), $active_id, $this->getId());
            }
        } else {
            include_once("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
            if (ilObjAssessmentFolder::_enabledAssessmentLogging()) {
                assQuestion::logAction($this->lng->txtlng(
                    "assessment",
                    "log_user_not_entered_values",
                    ilObjAssessmentFolder::_getLogLanguage()
                ), $active_id, $this->getId());
            }
        }
 
        return true;
    }
 
    public function getSolutionSubmit()
    {
        if (ilObjAdvancedEditing::_getRichTextEditor() === 'tinymce') {
            $text = ilUtil::stripSlashes($_POST["TEXT"], false);
        } else {
            $text = htmlentities($_POST["TEXT"]);
        }
 
        if (ilUtil::isHTML($text)) {
            $text = $this->getHtmlUserSolutionPurifier()->purify($text);
        }
 
        return $text;
    }
 
    public function saveAdditionalQuestionDataToDb()
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
        $ilDB->manipulateF(
            "DELETE FROM " . $this->getAdditionalTableName() . " WHERE question_fi = %s",
            array( "integer" ),
            array( $this->getId()
                            )
        );
 
        $fields = array(
            'question_fi' => array('integer', $this->getId()),
            'maxnumofchars' => array('integer', $this->getMaxNumOfChars()),
            'word_cnt_enabled' => array('integer', (int) $this->isWordCounterEnabled()),
            'keywords' => array('text', null),
            'textgap_rating' => array('text', $this->getTextRating()),
            'matchcondition' => array('integer', $this->getMatchcondition()),
            'keyword_relation' => array('text', $this->getKeywordRelation())
        );
 
        $ilDB->insert($this->getAdditionalTableName(), $fields);
    }
 
    public function saveAnswerSpecificDataToDb()
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        $ilDB->manipulateF(
            "DELETE FROM qpl_a_essay WHERE question_fi = %s",
            array( "integer" ),
            array( $this->getId() )
        );
 
        foreach ($this->answers as $answer) {
            $nextID = $ilDB->nextId('qpl_a_essay');
            $ilDB->manipulateF(
                "INSERT INTO qpl_a_essay (answer_id, question_fi, answertext, points) VALUES (%s, %s, %s, %s)",
                array( "integer", "integer", "text", 'float' ),
                array(
                                    $nextID,
                                    $this->getId(),
                                    $answer->getAnswertext(),
                                    $answer->getPoints()
                                )
            );
        }
    }
 
    public function getQuestionType(): string
    {
        return "assTextQuestion";
    }
 
    public function getTextRating(): string
    {
        return $this->text_rating;
    }
 
    public function setTextRating($a_text_rating): void
    {
        switch ($a_text_rating) {
            case TEXTGAP_RATING_CASEINSENSITIVE:
            case TEXTGAP_RATING_CASESENSITIVE:
            case TEXTGAP_RATING_LEVENSHTEIN1:
            case TEXTGAP_RATING_LEVENSHTEIN2:
            case TEXTGAP_RATING_LEVENSHTEIN3:
            case TEXTGAP_RATING_LEVENSHTEIN4:
            case TEXTGAP_RATING_LEVENSHTEIN5:
                $this->text_rating = $a_text_rating;
                break;
            default:
                $this->text_rating = TEXTGAP_RATING_CASEINSENSITIVE;
                break;
        }
    }
 
    public function getAdditionalTableName(): string
    {
        return "qpl_qst_essay";
    }
 
    public function getRTETextWithMediaObjects(): string
    {
        return parent::getRTETextWithMediaObjects();
    }
 
    public function setExportDetailsXLS(ilAssExcelFormatHelper $worksheet, int $startrow, int $active_id, int $pass): int
    {
        parent::setExportDetailsXLS($worksheet, $startrow, $active_id, $pass);
 
        $solutions = $this->getSolutionValues($active_id, $pass);
 
        $i = 1;
        $worksheet->setCell($startrow + $i, 0, $this->lng->txt("result"));
        $worksheet->setBold($worksheet->getColumnCoord(0) . ($startrow + $i));
 
        require_once 'Modules/Test/classes/class.ilObjAssessmentFolder.php';
        $assessment_folder = new ilObjAssessmentFolder();
 
        $string_escaping_org_value = $worksheet->getStringEscaping();
        if ($assessment_folder->getExportEssayQuestionsWithHtml()) {
            $worksheet->setStringEscaping(false);
        }
 
        if (array_key_exists(0, $solutions) && strlen($solutions[0]["value1"])) {
            $worksheet->setCell($startrow + $i, 2, html_entity_decode($solutions[0]["value1"]));
        }
        $i++;
 
        $worksheet->setStringEscaping($string_escaping_org_value);
        return $startrow + $i + 1;
    }
 
    public function toJSON(): string
    {
        include_once("./Services/RTE/classes/class.ilRTE.php");
        $result = array();
        $result['id'] = $this->getId();
        $result['type'] = (string) $this->getQuestionType();
        $result['title'] = $this->getTitleForHTMLOutput();
        $result['question'] = $this->formatSAQuestion($this->getQuestion());
        $result['nr_of_tries'] = $this->getNrOfTries();
        $result['shuffle'] = $this->getShuffle();
        $result['maxlength'] = $this->getMaxNumOfChars();
        return json_encode($result);
    }
 
    public function getAnswerCount(): int
    {
        return count($this->answers);
    }
 
    public function addAnswer(
        $answertext = "",
        $points = 0.0,
        $points_unchecked = 0.0,
        $order = 0,
        $answerimage = ""
    ): void {
        include_once "./Modules/TestQuestionPool/classes/class.assAnswerMultipleResponseImage.php";
 
        // add answer
        $answer = new ASS_AnswerMultipleResponseImage($answertext, $points);
        $this->answers[] = $answer;
    }
 
    public function getAnswers(): array
    {
        return $this->answers;
    }
 
    public function getAnswer($index = 0): ?object
    {
        if ($index < 0) {
            return null;
        }
        if (count($this->answers) < 1) {
            return null;
        }
        if ($index >= count($this->answers)) {
            return null;
        }
 
        return $this->answers[$index];
    }
 
    public function deleteAnswer($index = 0): void
    {
        if ($index < 0) {
            return;
        }
        if (count($this->answers) < 1) {
            return;
        }
        if ($index >= count($this->answers)) {
            return;
        }
        $answer = $this->answers[$index];
        //if (strlen($answer->getImage())) {
        //    $this->deleteImage($answer->getImage());
        //}
        unset($this->answers[$index]);
        $this->answers = array_values($this->answers);
        for ($i = 0, $iMax = count($this->answers); $i < $iMax; $i++) {
            if ($this->answers[$i]->getOrder() > $index) {
                $this->answers[$i]->setOrder($i);
            }
        }
    }
 
    public function getAnswerTableName(): string
    {
        return 'qpl_a_essay';
    }
 
    public function flushAnswers(): void
    {
        $this->answers = array();
    }
 
    public function setAnswers($answers): void
    {
        if (isset($answers['answer'])) {
            $count = count($answers['answer']);
            $withPoints = true;
        } else {
            $count = count($answers);
            $withPoints = false;
        }
 
        $this->flushAnswers();
 
        for ($i = 0; $i < $count; $i++) {
            if ($withPoints) {
                $this->addAnswer($answers['answer'][$i], $answers['points'][$i]);
            } else {
                $this->addAnswer($answers[$i], 0);
            }
        }
    }
 
    public function duplicateAnswers($original_id): void
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        $result = $ilDB->queryF(
            "SELECT * FROM qpl_a_essay WHERE question_fi = %s",
            array('integer'),
            array($original_id)
        );
        if ($result->numRows()) {
            while ($row = $ilDB->fetchAssoc($result)) {
                $next_id = $ilDB->nextId('qpl_a_essay');
                $affectedRows = $ilDB->manipulateF(
                    "INSERT INTO qpl_a_essay (answer_id, question_fi, answertext, points)
                                         VALUES (%s, %s, %s, %s)",
                    array('integer','integer','text','float'),
                    array($next_id, $this->getId(), $row["answertext"], $row["points"])
                );
            }
        }
    }
 
    public function getKeywordRelation()
    {
        return $this->keyword_relation;
    }
 
    public function setKeywordRelation($a_relation): void
    {
        $this->keyword_relation = $a_relation;
    }
 
    public static function getValidScoringModes(): array
    {
        return array_merge(self::getScoringModesWithPointsByQuestion(), self::getScoringModesWithPointsByKeyword());
    }
 
    public static function getScoringModesWithPointsByQuestion(): array
    {
        return array('non', 'all', 'one');
    }
 
    public static function getScoringModesWithPointsByKeyword(): array
    {
        return array('any');
    }
 
 
    public function isAnswered(int $active_id, int $pass): bool
    {
        $numExistingSolutionRecords = assQuestion::getNumExistingSolutionRecords($active_id, $pass, $this->getId());
 
        return $numExistingSolutionRecords > 0;
    }
 
    public static function isObligationPossible(int $questionId): bool
    {
        return true;
    }
 
    public function countLetters($text): int
    {
        $text = strip_tags($text);
 
        $text = str_replace('&gt;', '>', $text);
        $text = str_replace('&lt;', '<', $text);
        $text = str_replace('&nbsp;', ' ', $text);
        $text = str_replace('&amp;', '&', $text);
 
        $text = str_replace("\r\n", "\n", $text);
        $text = str_replace("\n", "", $text);
 
        return ilStr::strLen($text);
    }
 
    public function countWords($text): int
    {
        if ($text === '') {
            return 0;
        }
        $text = str_replace('&nbsp;', ' ', $text);
 
        $text = preg_replace('/[.,:;!?\-_#\'"+*\\/=()&%§$]/m', '', $text);
 
        $text = preg_replace('/^\s*/m', '', $text);
        $text = preg_replace('/\s*$/m', '', $text);
        $text = preg_replace('/\s+/m', ' ', $text);
 
        return count(explode(' ', $text));
    }
 
    public function getLatestAutosaveContent(int $active_id, int $pass): ?string
    {
        // Do we have an unauthorized result?
        $cntresult = $this->db->query(
            '
            SELECT count(solution_id) cnt
            FROM tst_solutions
            WHERE active_fi = ' . $this->db->quote($active_id, 'int') . '
            AND question_fi = ' . $this->db->quote($this->getId(), 'int') . '
            AND authorized = ' . $this->db->quote(0, 'int')
            . ' AND pass = ' . $this->db->quote($pass, 'int')
        );
        $row = $this->db->fetchAssoc($cntresult);
        if ($row['cnt'] > 0) {
            $tresult = $this->db->query(
                '
            SELECT value1
            FROM tst_solutions
            WHERE active_fi = ' . $this->db->quote($active_id, 'int') . '
            AND question_fi = ' . $this->db->quote($this->getId(), 'int') . '
            AND authorized = ' . $this->db->quote(0, 'int')
            . ' AND pass = ' . $this->db->quote($pass, 'int')
            );
            $trow = $this->db->fetchAssoc($tresult);
            return $trow['value1'];
        }
        return null;
    }
}