class.assClozeTest.php

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<?php
 /*
   +----------------------------------------------------------------------------+
   | ILIAS open source                                                          |
   +----------------------------------------------------------------------------+
   | Copyright (c) 1998-2001 ILIAS open source, University of Cologne           |
   |                                                                            |
   | This program 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 2             |
   | of the License, or (at your option) any later version.                     |
   |                                                                            |
   | This program 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 this program; if not, write to the Free Software                |
   | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
   +----------------------------------------------------------------------------+
*/

include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
include_once "./Modules/Test/classes/inc.AssessmentConstants.php";

class assClozeTest extends assQuestion
{
        var $gaps;

        var $start_tag;

        var $end_tag;
        
        var $textgap_rating;

        var $identical_scoring;

        var $fixedTextLength;
        
        function assClozeTest(
                $title = "",
                $comment = "",
                $author = "",
                $owner = -1,
                $cloze_text = ""
        )
        {
                $this->start_tag = "[gap]";
                $this->end_tag = "[/gap]";
                $this->assQuestion($title, $comment, $author, $owner);
                $this->gaps = array();
                $this->setClozeText($cloze_text);
                $this->fixedTextLength = "";
                $this->identical_scoring = 1;
        }

        function isComplete()
        {
                if (($this->getTitle()) and ($this->getAuthor()) and ($this->getClozeText()) and (count($this->getGaps())) and ($this->getMaximumPoints() > 0))
                {
                        return TRUE;
                }
                else
                {
                        return FALSE;
                }
        }

        function cleanQuestiontext($text)
        {
                $text = preg_replace("/\[gap[^\]]*?\]/", "[gap]", $text);
                $text = preg_replace("/<gap([^>]*?)>/", "[gap]", $text);
                $text = str_replace("</gap>", "[/gap]", $text);
                return $text;
        }
        
        function loadFromDb($question_id)
        {
                global $ilDB;
                if ($question_id < 1) return;
                $statement = $ilDB->prepare("SELECT qpl_questions.*, " . $this->getAdditionalTableName() . ".* FROM qpl_questions, " . $this->getAdditionalTableName() . " WHERE question_id = ? AND qpl_questions.question_id = " . $this->getAdditionalTableName() . ".question_fi",
                        array(
                                "integer"
                        )
                );
                $result = $ilDB->execute($statement, 
                        array(
                                $question_id
                        )
                );
                if ($result->numRows() == 1)
                {
                        $data = $ilDB->fetchAssoc($result);
                        $this->setId($question_id);
                        $this->setObjId($data["obj_fi"]);
                        $this->setTitle($data["title"]);
                        $this->setComment($data["comment"]);
                        $this->setOriginalId($data["original_id"]);
                        $this->setAuthor($data["author"]);
                        $this->setPoints($data["points"]);
                        $this->setOwner($data["owner"]);
                        $this->setQuestion($this->cleanQuestiontext($data["question_text"]));
                        $this->setFixedTextLength($data["fixed_textlen"]);
                        $this->setIdenticalScoring($data["identical_scoring"]);
                        // replacement of old syntax with new syntax
                        include_once("./Services/RTE/classes/class.ilRTE.php");
                        $this->question = ilRTE::_replaceMediaObjectImageSrc($this->question, 1);
                        $this->setTextgapRating($data["textgap_rating"]);
                        $this->setEstimatedWorkingTime(substr($data["working_time"], 0, 2), substr($data["working_time"], 3, 2), substr($data["working_time"], 6, 2));

                        // open the cloze gaps with all answers
                        include_once "./Modules/TestQuestionPool/classes/class.assAnswerCloze.php";
                        include_once "./Modules/TestQuestionPool/classes/class.assClozeGap.php";
                        $statement = $ilDB->prepare("SELECT * FROM qpl_answer_cloze WHERE question_fi = ? ORDER BY gap_id, aorder ASC",
                                array(
                                        "integer" 
                                )
                        );
                        $result = $ilDB->execute($statement, 
                                array(
                                        $question_id
                                )
                        );
                        if ($result->numRows() > 0)
                        {
                                $this->gaps = array();
                                while ($data = $ilDB->fetchAssoc($result)) 
                                {
                                        switch ($data["cloze_type"])
                                        {
                                                case CLOZE_TEXT:
                                                        if (!array_key_exists($data["gap_id"], $this->gaps))
                                                        {
                                                                $this->gaps[$data["gap_id"]] = new assClozeGap(CLOZE_TEXT);
                                                        }
                                                        $answer = new assAnswerCloze(
                                                                $data["answertext"],
                                                                $data["points"],
                                                                $data["aorder"]
                                                        );
                                                        $this->gaps[$data["gap_id"]]->addItem($answer);
                                                        break;
                                                case CLOZE_SELECT:
                                                        if (!array_key_exists($data["gap_id"], $this->gaps))
                                                        {
                                                                $this->gaps[$data["gap_id"]] = new assClozeGap(CLOZE_SELECT);
                                                                $this->gaps[$data["gap_id"]]->setShuffle($data["shuffle"]);
                                                        }
                                                        $answer = new assAnswerCloze(
                                                                $data["answertext"],
                                                                $data["points"],
                                                                $data["aorder"]
                                                                );
                                                        $this->gaps[$data["gap_id"]]->addItem($answer);
                                                        break;
                                                case CLOZE_NUMERIC:
                                                        if (!array_key_exists($data["gap_id"], $this->gaps))
                                                        {
                                                                $this->gaps[$data["gap_id"]] = new assClozeGap(CLOZE_NUMERIC);
                                                        }
                                                        $answer = new assAnswerCloze(
                                                                $data["answertext"],
                                                                $data["points"],
                                                                $data["aorder"]
                                                        );
                                                        $answer->setLowerBound($data["lowerlimit"]);
                                                        $answer->setUpperBound($data["upperlimit"]);
                                                        $this->gaps[$data["gap_id"]]->addItem($answer);
                                                        break;
                                        }
                                }
                        }
                }
                parent::loadFromDb($question_id);
        }

        function saveToDb($original_id = "")
        {
                global $ilDB;

                include_once "./Services/Math/classes/class.EvalMath.php";
                $eval = new EvalMath();
                $eval->suppress_errors = TRUE;

                $estw_time = $this->getEstimatedWorkingTime();
                $estw_time = sprintf("%02d:%02d:%02d", $estw_time['h'], $estw_time['m'], $estw_time['s']);

                // cleanup RTE images which are not inserted into the question text
                include_once("./Services/RTE/classes/class.ilRTE.php");
                if ($this->id == -1)
                {
                        $now = getdate();
                        $created = sprintf("%04d%02d%02d%02d%02d%02d", $now['year'], $now['mon'], $now['mday'], $now['hours'], $now['minutes'], $now['seconds']);
                        $statement = $ilDB->prepareManip("INSERT INTO qpl_questions (question_id, question_type_fi, obj_fi, title, comment, points, author, " .
                                "owner, question_text, working_time, complete, created, original_id, TIMESTAMP) " .
                                "VALUES (NULL, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NULL)",
                                array(
                                        "integer", 
                                        "integer",
                                        "text",
                                        "text",
                                        "float",
                                        "text",
                                        "integer",
                                        "text",
                                        "time",
                                        "text",
                                        "text",
                                        "integer"
                                )
                        );
                        $data = array(
                                $this->getQuestionTypeID(),
                                $this->getObjId(),
                                $this->getTitle(),
                                $this->getComment(),
                                $this->getMaximumPoints(),
                                $this->getAuthor(),
                                $this->getOwner(),
                                ilRTE::_replaceMediaObjectImageSrc($this->getClozeText(), 0),
                                $estw_time,
                                ($this->isComplete()) ? "1" : "0",
                                $created,
                                ($original_id > 0) ? $original_id : NULL
                        );
                        $affectedRows = $ilDB->execute($statement, $data);

                        $this->setId($ilDB->getLastInsertId());
                        $statement = $ilDB->prepareManip("INSERT INTO " . $this->getAdditionalTableName() . " (question_fi, textgap_rating, identical_scoring, fixed_textlen) VALUES (?, ?, ?, ?)",
                                array(
                                        "integer", 
                                        "text",
                                        "text",
                                        "integer"
                                )
                        );
                        $data = array(
                                $this->getId(),
                                $this->getTextgapRating(),
                                $this->getIdenticalScoring(),
                                $this->getFixedTextLength() ? $this->getFixedTextLength() : NULL
                        );
                        $affectedRows = $ilDB->execute($statement, $data);

                        $this->createPageObject();

                        if ($this->getTestId() > 0)
                        {
                                $this->insertIntoTest($this->getTestId());
                        }
                }
                else
                {
                        $statement = $ilDB->prepareManip("UPDATE qpl_questions SET obj_fi = ?, title = ?, comment = ?, points = ?, author = ?,  " .
                                "question_text = ?, working_time = ?, complete = ? WHERE question_id = ?",
                                array(
                                        "integer",
                                        "text",
                                        "text",
                                        "float",
                                        "text",
                                        "text",
                                        "time",
                                        "text",
                                        "integer"
                                )
                        );
                        $data = array(
                                $this->getObjId(),
                                $this->getTitle(),
                                $this->getComment(),
                                $this->getMaximumPoints(),
                                $this->getAuthor(),
                                ilRTE::_replaceMediaObjectImageSrc($this->getClozeText(), 0),
                                $estw_time,
                                ($this->isComplete()) ? "1" : "0",
                                $this->getId()
                        );
                        $affectedRows = $ilDB->execute($statement, $data);

                        $statement = $ilDB->prepareManip("UPDATE " . $this->getAdditionalTableName() . " SET textgap_rating = ?, fixed_textlen = ?, identical_scoring = ? WHERE question_fi = ?",
                                array(
                                        "text", 
                                        "integer",
                                        "text",
                                        "integer"
                                )
                        );
                        $data = array(
                                $this->getTextgapRating(),
                                $this->getFixedTextLength() ? $this->getFixedTextLength() : NULL,
                                $this->getIdenticalScoring(),
                                $this->getId()
                        );
                        $affectedRows = $ilDB->execute($statement, $data);
                }

                $statement = $ilDB->prepareManip("DELETE FROM qpl_answer_cloze WHERE question_fi = ?",
                        array(
                                "integer"
                        )
                );
                $data = array(
                        $this->getId()
                );
                $affectedRows = $ilDB->execute($statement, $data);
                
                foreach ($this->gaps as $key => $gap)
                {
                        foreach ($gap->getItems() as $item)
                        {
                                $query = "";
                                switch ($gap->getType())
                                {
                                        case CLOZE_TEXT:
                                                $statement = $ilDB->prepareManip("INSERT INTO qpl_answer_cloze (answer_id, question_fi, gap_id, answertext, points, aorder, cloze_type) VALUES (NULL, ?, ?, ?, ?, ?, ?)",
                                                        array(
                                                                "integer", 
                                                                "integer",
                                                                "text",
                                                                "float",
                                                                "integer",
                                                                "text"
                                                        )
                                                );
                                                $data = array(
                                                        $this->getId(),
                                                        $key,
                                                        strlen($item->getAnswertext()) ? $item->getAnswertext() : "",
                                                        $item->getPoints(),
                                                        $item->getOrder(),
                                                        $gap->getType()
                                                );
                                                break;
                                        case CLOZE_SELECT:
                                                $statement = $ilDB->prepareManip("INSERT INTO qpl_answer_cloze (answer_id, question_fi, gap_id, answertext, points, aorder, cloze_type, shuffle) VALUES (NULL, ?, ?, ?, ?, ?, ?, ?)",
                                                        array(
                                                                "integer", 
                                                                "integer",
                                                                "text",
                                                                "float",
                                                                "integer",
                                                                "text",
                                                                "text"
                                                        )
                                                );
                                                $data = array(
                                                        $this->getId(),
                                                        $key,
                                                        strlen($item->getAnswertext()) ? $item->getAnswertext() : "",
                                                        $item->getPoints(),
                                                        $item->getOrder(),
                                                        $gap->getType(),
                                                        ($gap->getShuffle()) ? "1" : "0"
                                                );
                                                break;
                                        case CLOZE_NUMERIC:
                                                $statement = $ilDB->prepareManip("INSERT INTO qpl_answer_cloze (answer_id, question_fi, gap_id, answertext, points, aorder, cloze_type, lowerlimit, upperlimit) VALUES (NULL, ?, ?, ?, ?, ?, ?, ?, ?)",
                                                        array(
                                                                "integer", 
                                                                "integer",
                                                                "text",
                                                                "float",
                                                                "integer",
                                                                "text",
                                                                "text",
                                                                "text"
                                                        )
                                                );
                                                $data = array(
                                                        $this->getId(),
                                                        $key,
                                                        strlen($item->getAnswertext()) ? $item->getAnswertext() : "",
                                                        $item->getPoints(),
                                                        $item->getOrder(),
                                                        $gap->getType(),
                                                        ($eval->e($item->getLowerBound() !== FALSE) && strlen($item->getLowerBound()) > 0) ? $item->getLowerBound() : "0",
                                                        ($eval->e($item->getUpperBound() !== FALSE)  && strlen($item->getUpperBound()) > 0) ? $item->getUpperBound() : "0"
                                                );
                                                break;
                                }
                                $affectedRows = $ilDB->execute($statement, $data);
                        }
                }
                parent::saveToDb($original_id);
        }

        function getGaps()
        {
                return $this->gaps;
        }


        function flushGaps() 
        {
                $this->gaps = array();
        }

        function setClozeText($cloze_text = "")
        {
                $this->gaps = array();
                $cloze_text = $this->cleanQuestiontext($cloze_text);
                $this->question = $cloze_text;
                $this->createGapsFromQuestiontext();
        }
        
        function getClozeText() 
        {
                return $this->question;
        }

        function getStartTag() 
        {
                return $this->start_tag;
        }

        function setStartTag($start_tag = "[gap]") 
        {
                $this->start_tag = $start_tag;
        }
        
        function getEndTag() 
        {
                return $this->end_tag;
        }

        function setEndTag($end_tag = "[/gap]") 
        {
                $this->end_tag = $end_tag;
        }

        function createGapsFromQuestiontext()
        {
                include_once "./Modules/TestQuestionPool/classes/class.assClozeGap.php";
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerCloze.php";
                $search_pattern = "|\[gap\](.*?)\[/gap\]|i";
                preg_match_all($search_pattern, $this->getClozeText(), $found);
                $this->gaps = array();
                if (count($found[0]))
                {
                        foreach ($found[1] as $gap_index => $answers)
                        {
                                // create text gaps by default
                                $gap = new assClozeGap(CLOZE_TEXT);
                                $textparams = preg_split("/(?<!\\\\),/", $answers);
                                foreach ($textparams as $key => $value)
                                {
                                        $answer = new assAnswerCloze($value, 0, $key);
                                        $gap->addItem($answer);
                                }
                                $this->gaps[$gap_index] = $gap;
                        }
                }
        }
        
        function setGapType($gap_index, $gap_type)
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setType($gap_type);
                }
        }

        function setGapShuffle($gap_index = 0, $shuffle = 1) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setShuffle($shuffle);
                }
        }

        function clearGapAnswers() 
        {
                foreach ($this->gaps as $gap_index => $gap)
                {
                        $this->gaps[$gap_index]->clearItems();
                }
        }

        function getGapCount() 
        {
                if (is_array($this->gaps))
                {
                        return count($this->gaps);
                }
                else
                {
                        return 0;
                }
        }

        function addGapAnswer($gap_index, $order, $answer) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        if ($this->gaps[$gap_index]->getType() == CLOZE_NUMERIC)
                        {
                                // only allow notation with "." for real numbers
                                $answer = str_replace(",", ".", $answer);
                        }
                        $this->gaps[$gap_index]->addItem(new assAnswerCloze($answer, 0, $order));
                }
        }
        
        function getGap($gap_index = 0) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        return $this->gaps[$gap_index];
                }
                else
                {
                        return NULL;
                }
        }

        function setGapAnswerPoints($gap_index, $order, $points) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setItemPoints($order, $points);
                }
        }

        function addGapText($gap_index) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        include_once "./Modules/TestQuestionPool/classes/class.assAnswerCloze.php";
                        $answer = new assAnswerCloze(
                                "",
                                0,
                                $this->gaps[$gap_index]->getItemCount()
                        );
                        $this->gaps[$gap_index]->addItem($answer);
                }
        }
        
        function addGapAtIndex($gap, $index)
        {
                $this->gaps[$index] = $gap;
        }

        function setGapAnswerLowerBound($gap_index, $order, $bound) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setItemLowerBound($order, $bound);
                }
        }

        function setGapAnswerUpperBound($gap_index, $order, $bound) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $this->gaps[$gap_index]->setItemUpperBound($order, $bound);
                }
        }

        function getMaximumPoints() 
        {
                $points = 0;
                foreach ($this->gaps as $gap_index => $gap) 
                {
                        if ($gap->getType() == CLOZE_TEXT) 
                        {
                                $gap_max_points = 0;
                                foreach ($gap->getItems() as $item) 
                                {
                                        if ($item->getPoints() > $gap_max_points)
                                        {
                                                $gap_max_points = $item->getPoints();
                                        }
                                }
                                $points += $gap_max_points;
                        } 
                        else if ($gap->getType() == CLOZE_SELECT)
                        {
                                $srpoints = 0;
                                foreach ($gap->getItems() as $item) 
                                {
                                        if ($item->getPoints() > $srpoints)
                                        {
                                                $srpoints = $item->getPoints();
                                        }
                                }
                                $points += $srpoints;
                        }
                        else if ($gap->getType() == CLOZE_NUMERIC)
                        {
                                $numpoints = 0;
                                foreach ($gap->getItems() as $item)
                                {
                                        if ($item->getPoints() > $numpoints)
                                        {
                                                $numpoints = $item->getPoints();
                                        }
                                }
                                $points += $numpoints;
                        }
                }
                return $points;
        }

        function duplicate($for_test = true, $title = "", $author = "", $owner = "")
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                // duplicate the question in database
                $this_id = $this->getId();
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->id);
                $clone->id = -1;
                if ($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);
                // duplicate the generic feedback
                $clone->duplicateFeedbackGeneric($this_id);

                return $clone->getId();
        }

        function copyObject($target_questionpool, $title = "")
        {
                if ($this->getId() <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->getId());
                $clone->id = -1;
                $source_questionpool = $this->getObjId();
                $clone->setObjId($target_questionpool);
                if ($title)
                {
                        $clone->setTitle($title);
                }
                $clone->saveToDb();

                // copy question page content
                $clone->copyPageOfQuestion($original_id);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($original_id);
                // duplicate the generic feedback
                $clone->duplicateFeedbackGeneric($original_id);

                return $clone->getId();
        }

        function updateClozeTextFromGaps()
        {
                $output = $this->getClozeText();
                foreach ($this->getGaps() as $gap_index => $gap)
                {
                        $answers = array();
                        foreach ($gap->getItemsRaw() as $item)
                        {
                                array_push($answers, str_replace(",", "\\,", $item->getAnswerText()));
                        }
                        $output = preg_replace("/\[gap\].*?\[\/gap\]/", "[_gap]" . ilUtil::prepareFormOutput(join(",", $answers)) . "[/_gap]", $output, 1);
                }
                $output = str_replace("_gap]", "gap]", $output);
                $this->question = $output;
        }
        
        function deleteAnswerText($gap_index, $answer_index) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        if ($this->gaps[$gap_index]->getItemCount() == 1)
                        {
                                // this is the last answer text => remove the gap
                                $this->deleteGap($gap_index);
                        }
                        else
                        {
                                // remove the answer text
                                $this->gaps[$gap_index]->deleteItem($answer_index);
                                $this->updateClozeTextFromGaps();
                        }
                }
        }

        function deleteGap($gap_index) 
        {
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $output = $this->getClozeText();
                        foreach ($this->getGaps() as $replace_gap_index => $gap)
                        {
                                $answers = array();
                                foreach ($gap->getItemsRaw() as $item)
                                {
                                        array_push($answers, str_replace(",", "\\,", $item->getAnswerText()));
                                }
                                if ($replace_gap_index == $gap_index)
                                {
                                        $output = preg_replace("/\[gap\].*?\[\/gap\]/", "", $output, 1);
                                }
                                else
                                {
                                        $output = preg_replace("/\[gap\].*?\[\/gap\]/", "[_gap]" . join(",", $answers) . "[/_gap]", $output, 1);
                                }
                        }
                        $output = str_replace("_gap]", "gap]", $output);
                        $this->question = $output;
                        unset($this->gaps[$gap_index]);
                        $this->gaps = array_values($this->gaps);
                }
        }

        function getTextgapPoints($a_original, $a_entered, $max_points)
        {
                include_once "./Services/Utilities/classes/class.ilStr.php";
                $result = 0;
                $gaprating = $this->getTextgapRating();
                switch ($gaprating)
                {
                        case TEXTGAP_RATING_CASEINSENSITIVE:
                                if (strcmp(ilStr::strToLower($a_original), ilStr::strToLower($a_entered)) == 0) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_CASESENSITIVE:
                                if (strcmp($a_original, $a_entered) == 0) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN1:
                                if (levenshtein($a_original, $a_entered) <= 1) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN2:
                                if (levenshtein($a_original, $a_entered) <= 2) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN3:
                                if (levenshtein($a_original, $a_entered) <= 3) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN4:
                                if (levenshtein($a_original, $a_entered) <= 4) $result = $max_points;
                                break;
                        case TEXTGAP_RATING_LEVENSHTEIN5:
                                if (levenshtein($a_original, $a_entered) <= 5) $result = $max_points;
                                break;
                }
                return $result;
        }
        
        function getNumericgapPoints($a_original, $a_entered, $max_points, $lowerBound, $upperBound)
        {
                include_once "./Services/Math/classes/class.EvalMath.php";
                $eval = new EvalMath();
                $eval->suppress_errors = TRUE;
                $result = 0;
                if (($eval->e($lowerBound) !== FALSE) && ($eval->e($upperBound) !== FALSE))
                {
                        if (($eval->e($a_entered) >= $eval->e($lowerBound)) && ($eval->e($a_entered) <= $eval->e($upperBound))) $result = $max_points;
                }
                else if ($eval->e($lowerBound) !== FALSE)
                {
                        if (($eval->e($a_entered) >= $eval->e($lowerBound)) && ($eval->e($a_entered) <= $eval->e($a_original))) $result = $max_points;
                }
                else if ($eval->e($upperBound) !== FALSE)
                {
                        if (($eval->e($a_entered) >= $eval->e($a_original)) && ($eval->e($a_entered) <= $eval->e($upperBound))) $result = $max_points;
                }
                else
                {
                        if ($eval->e($a_entered) == $eval->e($a_original)) $result = $max_points;
                }
                return $result;
        }
        
        function calculateReachedPoints($active_id, $pass = NULL, $returndetails = FALSE)
        {
                global $ilDB;
                
                $found_value1 = array();
                $found_value2 = array();
                $detailed = array();
                if (is_null($pass))
                {
                        $pass = $this->getSolutionMaxPass($active_id);
                }
                $statement = $ilDB->prepare("SELECT * FROM tst_solutions WHERE active_fi = ? AND question_fi = ? AND pass = ?",
                        array(
                                "integer", 
                                "integer",
                                "integer"
                        )
                );
                $result = $ilDB->execute($statement, 
                        array(
                                $active_id,
                                $this->getId(),
                                $pass
                        )
                );
                $user_result = array();
                while ($data = $ilDB->fetchAssoc($result)) 
                {
                        if (strcmp($data["value2"], "") != 0)
                        {
                                $user_result[$data["value1"]] = array(
                                        "gap_id" => $data["value1"],
                                        "value" => $data["value2"]
                                );
                        }
                }
                $points = 0;
                $counter = 0;
                $solution_values_text = array(); // for identical scoring checks
                $solution_values_select = array(); // for identical scoring checks
                $solution_values_numeric = array(); // for identical scoring checks
                foreach ($user_result as $gap_id => $value) 
                {
                        if (array_key_exists($gap_id, $this->gaps))
                        {
                                switch ($this->gaps[$gap_id]->getType())
                                {
                                        case CLOZE_TEXT:
                                                $gappoints = 0;
                                                for ($order = 0; $order < $this->gaps[$gap_id]->getItemCount(); $order++) 
                                                {
                                                        $answer = $this->gaps[$gap_id]->getItem($order);
                                                        $gotpoints = $this->getTextgapPoints($answer->getAnswertext(), $value["value"], $answer->getPoints());
                                                        if ($gotpoints > $gappoints) $gappoints = $gotpoints;
                                                }
                                                if (!$this->getIdenticalScoring())
                                                {
                                                        // check if the same solution text was already entered
                                                        if ((in_array($value["value"], $solution_values_text)) && ($gappoints > 0))
                                                        {
                                                                $gappoints = 0;
                                                        }
                                                }
                                                $points += $gappoints;
                                                $detailed[$gap_id] = array("points" =>$gappoints, "best" => ($this->getMaximumGapPoints($gap_id) == $gappoints) ? TRUE : FALSE, "positive" => ($gappoints > 0) ? TRUE : FALSE);
                                                array_push($solution_values_text, $value["value"]);
                                                break;
                                        case CLOZE_NUMERIC:
                                                $gappoints = 0;
                                                for ($order = 0; $order < $this->gaps[$gap_id]->getItemCount(); $order++) 
                                                {
                                                        $answer = $this->gaps[$gap_id]->getItem($order);
                                                        $gotpoints = $this->getNumericgapPoints($answer->getAnswertext(), $value["value"], $answer->getPoints(), $answer->getLowerBound(), $answer->getUpperBound());
                                                        if ($gotpoints > $gappoints) $gappoints = $gotpoints;
                                                }
                                                if (!$this->getIdenticalScoring())
                                                {
                                                        // check if the same solution value was already entered
                                                        include_once "./Services/Math/classes/class.EvalMath.php";
                                                        $eval = new EvalMath();
                                                        $eval->suppress_errors = TRUE;
                                                        $found_value = FALSE;
                                                        foreach ($solution_values_numeric as $solval)
                                                        {
                                                                if ($eval->e($solval) == $eval->e($value["value"]))
                                                                {
                                                                        $found_value = TRUE;
                                                                }
                                                        }
                                                        if ($found_value && ($gappoints > 0))
                                                        {
                                                                $gappoints = 0;
                                                        }
                                                }
                                                $points += $gappoints;
                                                $detailed[$gap_id] = array("points" =>$gappoints, "best" => ($this->getMaximumGapPoints($gap_id) == $gappoints) ? TRUE : FALSE, "positive" => ($gappoints > 0) ? TRUE : FALSE);
                                                array_push($solution_values_numeric, $value["value"]);
                                                break;
                                        case CLOZE_SELECT:
                                                if ($value["value"] >= 0)
                                                {
                                                        for ($order = 0; $order < $this->gaps[$gap_id]->getItemCount(); $order++) 
                                                        {
                                                                $answer = $this->gaps[$gap_id]->getItem($order);
                                                                if ($value["value"] == $answer->getOrder())
                                                                {
                                                                        $answerpoints = $answer->getPoints();
                                                                        if (!$this->getIdenticalScoring())
                                                                        {
                                                                                // check if the same solution value was already entered
                                                                                if ((in_array($answer->getAnswertext(), $solution_values_select)) && ($answerpoints > 0))
                                                                                {
                                                                                        $answerpoints = 0;
                                                                                }
                                                                        }
                                                                        $points += $answerpoints;
                                                                        $detailed[$gap_id] = array("points" =>$answerpoints, "best" => ($this->getMaximumGapPoints($gap_id) == $answerpoints) ? TRUE : FALSE, "positive" => ($answerpoints > 0) ? TRUE : FALSE);
                                                                        array_push($solution_values_select, $answer->getAnswertext());
                                                                }
                                                        }
                                                }
                                                break;
                                }
                        }
                }
                if ($returndetails)
                {
                        return $detailed;
                }
                else
                {
                        $points = parent::calculateReachedPoints($active_id, $pass = NULL, $points);
                        return $points;
                }
        }

        function saveWorkingData($active_id, $pass = NULL) 
        {
                global $ilDB;
                global $ilUser;
                if (is_null($pass))
                {
                        include_once "./Modules/Test/classes/class.ilObjTest.php";
                        $pass = ilObjTest::_getPass($active_id);
                }

                $statement = $ilDB->prepareManip("DELETE FROM tst_solutions WHERE active_fi = ? AND question_fi = ? AND pass = ?",
                        array(
                                "integer", 
                                "integer",
                                "integer"
                        )
                );
                $data = array(
                        $active_id,
                        $this->getId(),
                        $pass
                );
                $affectedRows = $ilDB->execute($statement, $data);

                $entered_values = 0;
                foreach ($_POST as $key => $value) 
                {
                        if (preg_match("/^gap_(\d+)/", $key, $matches)) 
                        { 
                                $value = ilUtil::stripSlashes($value, FALSE);
                                if (strlen($value))
                                {
                                        $gap = $this->getGap($matches[1]);
                                        if (is_object($gap))
                                        {
                                                if (!(($gap->getType() == CLOZE_SELECT) && ($value == -1)))
                                                {
                                                        if ($gap->getType() == CLOZE_NUMERIC)
                                                        {
                                                                $value = str_replace(",", ".", $value);
                                                        }
                                                        $statement = $ilDB->prepareManip("INSERT INTO tst_solutions (solution_id, active_fi, question_fi, value1, value2, pass, TIMESTAMP) VALUES (NULL, ?, ?, ?, ?, ?, NULL)",
                                                                array(
                                                                        "integer", 
                                                                        "integer",
                                                                        "text",
                                                                        "text",
                                                                        "integer"
                                                                )
                                                        );
                                                        $data = array(
                                                                $active_id,
                                                                $this->getId(),
                                                                trim($matches[1]),
                                                                trim($value),
                                                                $pass
                                                        );
                                                        $affectedRows = $ilDB->execute($statement, $data);
                                                        $entered_values++;
                                                }
                                        }
                                }
                        }
                }
                if ($entered_values)
                {
                        include_once ("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
                        if (ilObjAssessmentFolder::_enabledAssessmentLogging())
                        {
                                $this->logAction($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())
                        {
                                $this->logAction($this->lng->txtlng("assessment", "log_user_not_entered_values", ilObjAssessmentFolder::_getLogLanguage()), $active_id, $this->getId());
                        }
                }
                parent::saveWorkingData($active_id, $pass);
                return TRUE;
        }

        function getQuestionType()
        {
                return "assClozeTest";
        }

        function getTextgapRating()
        {
                return $this->textgap_rating;
        }

        function setTextgapRating($a_textgap_rating)
        {
                switch ($a_textgap_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->textgap_rating = $a_textgap_rating;
                                break;
                        default:
                                $this->textgap_rating = TEXTGAP_RATING_CASEINSENSITIVE;
                                break;
                }
        }

        function getIdenticalScoring()
        {
                return ($this->identical_scoring) ? 1 : 0;
        }

        function setIdenticalScoring($a_identical_scoring)
        {
                $this->identical_scoring = ($a_identical_scoring) ? 1 : 0;
        }

        function getAdditionalTableName()
        {
                return "qpl_question_cloze";
        }

        function getAnswerTableName()
        {
                return "qpl_answer_cloze";
        }
        
        function setFixedTextLength($a_text_len)
        {
                $this->fixedTextLength = $a_text_len;
        }
        
        function getFixedTextLength()
        {
                return $this->fixedTextLength;
        }

        function getMaximumGapPoints($gap_index) 
        {
                $points = 0;
                if (array_key_exists($gap_index, $this->gaps))
                {
                        $gap =& $this->gaps[$gap_index];
                        foreach ($gap->getItems() as $answer) 
                        {
                                if ($answer->getPoints() > $gap_max_points)
                                {
                                        $gap_max_points = $answer->getPoints();
                                }
                        }
                        $points += $gap_max_points;
                }
                return $points;
        }

        function getRTETextWithMediaObjects()
        {
                return parent::getRTETextWithMediaObjects();
        }

        public function setExportDetailsXLS(&$worksheet, $startrow, $active_id, $pass, &$format_title, &$format_bold)
        {
                include_once ("./classes/class.ilExcelUtils.php");
                $solution = $this->getSolutionValues($active_id, $pass);
                $worksheet->writeString($startrow, 0, ilExcelUtils::_convert_text($this->lng->txt($this->getQuestionType())), $format_title);
                $worksheet->writeString($startrow, 1, ilExcelUtils::_convert_text($this->getTitle()), $format_title);
                $i = 1;
                foreach ($this->getGaps() as $gap_index => $gap)
                {
                        $worksheet->writeString($startrow + $i, 0, ilExcelUtils::_convert_text($this->lng->txt("gap") . " $i"), $format_bold);
                        $checked = FALSE;
                        foreach ($solution as $solutionvalue)
                        {
                                if ($gap_index == $solutionvalue["value1"])
                                {
                                        switch ($gap->getType())
                                        {
                                                case CLOZE_SELECT:
                                                        $worksheet->writeString($startrow + $i, 1, $gap->getItem($solutionvalue["value2"])->getAnswertext());
                                                        break;
                                                case CLOZE_NUMERIC:
                                                case CLOZE_TEXT:
                                                        $worksheet->writeString($startrow + $i, 1, $solutionvalue["value2"]);
                                                        break;
                                        }
                                }
                        }
                        $i++;
                }
                return $startrow + $i + 1;
        }
}
?>