class.assErrorText.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */
 
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';
require_once './Modules/TestQuestionPool/interfaces/interface.iQuestionCondition.php';
require_once './Modules/TestQuestionPool/classes/class.ilUserQuestionResult.php';
 
class assErrorText extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable, iQuestionCondition
{
        protected $errortext;
        protected $textsize;
        protected $errordata;
        protected $points_wrong;
 
        function __construct(
                                $title = '',
                                $comment = '',
                                $author = '',
                                $owner = -1,
                                $question = ''
        )
        {
                parent::__construct($title, $comment, $author, $owner, $question);
                $this->errortext = '';
                $this->textsize = 100.0;
                $this->errordata = array();
        }
 
        public function isComplete()
        {
                if (strlen($this->title) 
                        && ($this->author) 
                        && ($this->question) 
                        && ($this->getMaximumPoints() > 0))
                {
                        return true;
                }
                else
                {
                        return false;
                }
        }
 
        public function saveToDb($original_id = "")
        {
                $this->saveQuestionDataToDb($original_id);
                $this->saveAdditionalQuestionDataToDb();
                $this->saveAnswerSpecificDataToDb();
                parent::saveToDb();
        }
 
        public function saveAnswerSpecificDataToDb()
        {
                global $ilDB;
                $ilDB->manipulateF( "DELETE FROM qpl_a_errortext WHERE question_fi = %s",
                                                        array( 'integer' ),
                                                        array( $this->getId() )
                );
 
                $sequence = 0;
                foreach ($this->errordata as $object)
                {
                        $next_id = $ilDB->nextId( 'qpl_a_errortext' );
                        $ilDB->manipulateF( "INSERT INTO qpl_a_errortext (answer_id, question_fi, text_wrong, text_correct, points, sequence) VALUES (%s, %s, %s, %s, %s, %s)",
                                                                array( 'integer', 'integer', 'text', 'text', 'float', 'integer' ),
                                                                array(
                                                                        $next_id,
                                                                        $this->getId(),
                                                                        $object->text_wrong,
                                                                        $object->text_correct,
                                                                        $object->points,
                                                                        $sequence++
                                                                )
                        );
                }
        }
 
        public function saveAdditionalQuestionDataToDb()
        {
                global $ilDB;
                // save additional data
                $ilDB->manipulateF( "DELETE FROM " . $this->getAdditionalTableName() . " WHERE question_fi = %s",
                                                        array( "integer" ),
                                                        array( $this->getId() )
                );
                
                $ilDB->manipulateF("INSERT INTO " . $this->getAdditionalTableName() . " (question_fi, errortext, textsize, points_wrong) VALUES (%s, %s, %s, %s)",
                                                   array("integer", "text", "float", "float"),
                                                   array(
                                                           $this->getId(),
                                                           $this->getErrorText(),
                                                           $this->getTextSize(),
                                                           $this->getPointsWrong()
                                                   )
                );
        }
 
        public function loadFromDb($question_id)
        {
                global $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 ($result->numRows() == 1)
                {
                        $data = $ilDB->fetchAssoc($result);
                        $this->setId($question_id);
                        $this->setObjId($data["obj_fi"]);
                        $this->setTitle($data["title"]);
                        $this->setComment($data["description"]);
                        $this->setOriginalId($data["original_id"]);
                        $this->setNrOfTries($data['nr_of_tries']);
                        $this->setAuthor($data["author"]);
                        $this->setPoints($data["points"]);
                        $this->setOwner($data["owner"]);
                        include_once("./Services/RTE/classes/class.ilRTE.php");
                        $this->setQuestion(ilRTE::_replaceMediaObjectImageSrc($data["question_text"], 1));
                        $this->setErrorText($data["errortext"]);
                        $this->setTextSize($data["textsize"]);
                        $this->setPointsWrong($data["points_wrong"]);
                        $this->setEstimatedWorkingTime(substr($data["working_time"], 0, 2), substr($data["working_time"], 3, 2), substr($data["working_time"], 6, 2));
                        
                        try
                        {
                                $this->setAdditionalContentEditingMode($data['add_cont_edit_mode']);
                        }
                        catch(ilTestQuestionPoolException $e)
                        {
                        }
                }
 
                $result = $ilDB->queryF("SELECT * FROM qpl_a_errortext WHERE question_fi = %s ORDER BY sequence ASC",
                        array('integer'),
                        array($question_id)
                );
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerErrorText.php";
                if ($result->numRows() > 0)
                {
                        while ($data = $ilDB->fetchAssoc($result))
                        {
                                array_push($this->errordata, new assAnswerErrorText($data["text_wrong"], $data["text_correct"], $data["points"]));
                        }
                }
 
                parent::loadFromDb($question_id);
        }
 
        public function duplicate($for_test = true, $title = "", $author = "", $owner = "", $testObjId = null)
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                // 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);
 
                $clone->onDuplicate($thisObjId, $this_id, $clone->getObjId(), $clone->getId());
                return $clone->id;
        }
 
        public function copyObject($target_questionpool_id, $title = "")
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                // duplicate the question in database
                
                $thisId = $this->getId();
                $thisObjId = $this->getObjId();
                
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->id);
                $clone->id = -1;
                $clone->setObjId($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);
 
                $clone->onCopy($thisObjId, $thisId, $clone->getObjId(), $clone->getId());
 
                return $clone->id;
        }
 
        public function createNewOriginalFromThisDuplicate($targetParentId, $targetQuestionTitle = "")
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
 
                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);
 
                $clone->onCopy($sourceParentId, $sourceQuestionId, $clone->getObjId(), $clone->getId());
 
                return $clone->id;
        }
 
        public function getMaximumPoints()
        {
                $maxpoints = 0.0;
                foreach ($this->errordata as $object)
                {
                        if ($object->points > 0) $maxpoints += $object->points;
                }
                return $maxpoints;
        }
 
        public function calculateReachedPoints($active_id, $pass = NULL, $authorizedSolution = true, $returndetails = FALSE)
        {
                if( $returndetails )
                {
                        throw new ilTestException('return details not implemented for '.__METHOD__);
                }
 
                global $ilDB;
 
                /* First get the positions which were selected by the user. */
                $positions = array();
                if (is_null($pass)) {
                        $pass = $this->getSolutionMaxPass($active_id);
                }
                $result = $this->getCurrentSolutionResultSet($active_id, $pass, $authorizedSolution);
 
                while ($row = $ilDB->fetchAssoc($result)) {
                        array_push($positions, $row['value1']);
                }
                $points = $this->getPointsForSelectedPositions($positions);
                return $points;
        }
 
        public function calculateReachedPointsFromPreviewSession(ilAssQuestionPreviewSession $previewSession)
        {
                $reachedPoints = $this->getPointsForSelectedPositions($previewSession->getParticipantsSolution());
                $reachedPoints = $this->deductHintPointsFromReachedPoints($previewSession, $reachedPoints);
                return $this->ensureNonNegativePoints($reachedPoints);
        }
 
        public function saveWorkingData($active_id, $pass = NULL, $authorized = true)
        {
                global $ilDB;
                global $ilUser;
 
                if (is_null($pass))
                {
                        include_once "./Modules/Test/classes/class.ilObjTest.php";
                        $pass = ilObjTest::_getPass($active_id);
                }
 
                $entered_values = false;
 
                $this->getProcessLocker()->executeUserSolutionUpdateLockOperation(function() use (&$entered_values, $active_id, $pass, $authorized) {
 
                        $this->removeCurrentSolution($active_id, $pass, $authorized);
 
                        if(strlen($_POST["qst_" . $this->getId()]))
                        {
                                $selected = explode(",", $_POST["qst_" . $this->getId()]);
                                foreach ($selected as $position)
                                {
                                        $this->saveCurrentSolution($active_id, $pass, $position, null, $authorized);
                                }
                                $entered_values = true;
                        }
 
                });
 
                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 savePreviewData(ilAssQuestionPreviewSession $previewSession)
        {
                if( strlen($_POST["qst_" . $this->getId()]) )
                {
                        $selection = explode(',', $_POST["qst_{$this->getId()}"]);
                }
                else
                {
                        $selection = array();
                }
                
                $previewSession->setParticipantsSolution($selection);
        }
 
        protected function reworkWorkingData($active_id, $pass, $obligationsAnswered, $authorized)
        {
                // nothing to rework!
        }
 
        public function getQuestionType()
        {
                return "assErrorText";
        }
 
        public function getAdditionalTableName()
        {
                return "qpl_qst_errortext";
        }
 
        public function getAnswerTableName()
        {
                return "qpl_a_errortext";
        }
 
        public function getRTETextWithMediaObjects()
        {
                $text = parent::getRTETextWithMediaObjects();
                return $text;
        }
 
        public function setExportDetailsXLS($worksheet, $startrow, $active_id, $pass)
        {
                parent::setExportDetailsXLS($worksheet, $startrow, $active_id, $pass);
 
                $i= 0;
                $selections = array();
                $solutions =& $this->getSolutionValues($active_id, $pass);
                if (is_array($solutions))
                {
                        foreach ($solutions as $solution)
                        {
                                array_push($selections, $solution['value1']);
                        }
                        $errortext_value = join(",", $selections);
                }
                $errortext = $this->createErrorTextExport($selections);
                $i++;
                $worksheet->setCell($startrow+$i, 0, $errortext);
                $i++;
 
                return $startrow + $i + 1;
        }
 
        public function fromXML(&$item, &$questionpool_id, &$tst_id, &$tst_object, &$question_counter, &$import_mapping)
        {
                include_once "./Modules/TestQuestionPool/classes/import/qti12/class.assErrorTextImport.php";
                $import = new assErrorTextImport($this);
                $import->fromXML($item, $questionpool_id, $tst_id, $tst_object, $question_counter, $import_mapping);
        }
 
        public function toXML($a_include_header = true, $a_include_binary = true, $a_shuffle = false, $test_output = false, $force_image_references = false)
        {
                include_once "./Modules/TestQuestionPool/classes/export/qti12/class.assErrorTextExport.php";
                $export = new assErrorTextExport($this);
                return $export->toXML($a_include_header, $a_include_binary, $a_shuffle, $test_output, $force_image_references);
        }
 
        public function getBestSolution($active_id, $pass)
        {
                $user_solution = array();
                return $user_solution;
        }
 
        public function getErrorsFromText($a_text = "")
        {
                if (strlen($a_text) == 0)
                        $a_text = $this->getErrorText();
 
                /* Workaround to allow '(' and ')' in passages.
                   The beginning- and ending- Passage delimiters are
                   replaced by a ~ (Tilde) symbol. */
                $a_text = str_replace(array("((", "))"), array("~", "~"), $a_text);
 
                /* Match either Passage delimited by double brackets
                   or single words marked with a hash (#). */
                $r_passage = "/(~([^~]+)~|#([^\s]+))/";
 
                preg_match_all($r_passage, $a_text, $matches);
 
                if (is_array($matches[0]) && !empty($matches[0])) {
                        /* At least one match. */
 
                        /* We need only groups 2 and 3, respectively representing
                           passage matches and single word matches. */
                        $matches = array_intersect_key($matches, array(2 => '', 3 => ''));
 
                        /* Remove empty values. */
                        $matches[2] = array_diff($matches[2], array(''));
                        $matches[3] = array_diff($matches[3], array(''));
 
                        return array(
                                "passages"  => $matches[2],
                                "words"         => $matches[3],);
                }
 
                return array();
        }
 
        public function setErrorData($a_data)
        {
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerErrorText.php";
                $temp = $this->errordata;
                $this->errordata = array();
                foreach ($a_data as $err_type => $errors) {
                        /* Iterate through error types (Passages|single words) */
 
                        foreach ($errors as $idx => $error) {
                                /* Iterate through errors of this type. */
                                $text_correct = "";
                                $points = 0.0;
                                foreach ($temp as $object) {
                                        if (strcmp($object->text_wrong, $error) == 0) {
                                                $text_correct = $object->text_correct;
                                                $points = $object->points;
                                                continue;
                                        }
                                }
                                $this->errordata[$idx] = new assAnswerErrorText($error, $text_correct, $points);
                        }
                }
                ksort($this->errordata);
        }
 
        public function createErrorTextOutput($selections = null, $graphicalOutput = false, $correct_solution = false, $use_link_tags = true)
        {
                $counter = 0;
                $errorcounter = 0;
                include_once "./Services/Utilities/classes/class.ilStr.php";
                if (!is_array($selections)) $selections = array();
                $textarray = preg_split("/[\n\r]+/", $this->getErrorText());
 
                foreach ($textarray as $textidx => $text)
                {
                        $in_passage      = false;
                        $passage_end = false;
                        $items = preg_split("/\s+/", $text);
                        foreach ($items as $idx => $item)
                        {
                                $img = '';
 
                                if(
                                        ($posHash = strpos($item, '#')) === 0 ||
                                        ($posOpeningBrackets = strpos($item, '((')) === 0 ||
                                        ($posClosingBrackets = strpos($item, '))')) !== false
                                )
                                {
                                        /* (Word|Passage)-Marking delimiter found. */
 
                                        if($posHash !== false)
                                        {
                                                $item = ilStr::substr($item, 1, ilStr::strlen($item) - 1);
                                                $passage_end = false;
                                        }
                                        else if($posOpeningBrackets !== false)
                                        {
                                                $in_passage  = true;
                                                $passage_start_idx = $counter;
                                                $items_in_passage = array();
                                                $passage_end = false;
                                                $item = ilStr::substr($item, 2, ilStr::strlen($item) - 2);
 
                                                /* Sometimes a closing bracket group needs
                                                   to be removed as well. */
                                                if(strpos($item, '))') !== false)
                                                {
                                                        $item = str_replace("))", "", $item);
                                                        $passage_end = true;
                                                }
                                        }
                                        else
                                        {
                                                $passage_end = true;
                                                $item = str_replace("))", "", $item);
                                        }
 
                                        if($correct_solution && !$in_passage)
                                        {
                                                $errorobject = $this->errordata[$errorcounter];
                                                if (is_object($errorobject) )
                                                {
                                                        $item = strlen($errorobject->text_correct) ? $errorobject->text_correct : '&nbsp;';
                                                }
                                                $errorcounter++;
                                        }
                                }
                                
                                if($in_passage && !$passage_end)
                                {
                                        $items_in_passage[$idx] = $item;
                                        $items[$idx] = '';
                                        $counter++;
                                        continue;
                                }
 
                                if($in_passage && $passage_end)
                                {
                                        $in_passage  = false;
                                        $passage_end = false;
                                        if($correct_solution)
                                        {
                                                $class = ( $this->isTokenSelected($counter, $selections) ?
                                                        "ilc_qetitem_ErrorTextSelected" : "ilc_qetitem_ErrorTextItem"
                                                );
                                                
                                                $errorobject = $this->errordata[$errorcounter];
                                                if (is_object($errorobject) )
                                                {
                                                        $item = strlen($errorobject->text_correct) ? $errorobject->text_correct : '&nbsp;';
                                                }
                                                $errorcounter++;
                                                $items[$idx] = $this->getErrorTokenHtml($item, $class, $use_link_tags) . $img;
                                                $counter++;
                                                continue;
                                        }
                                        
                                        $group_selected = true;
                                        if($graphicalOutput)
                                        {
                                                $start_idx = $passage_start_idx;
                                                foreach($items_in_passage as $tmp_idx => $tmp_item)
                                                {
                                                        if(!$this->isTokenSelected($start_idx, $selections))
                                                        {
                                                                $group_selected = false;
                                                                break;
                                                        }
                                                        
                                                        ++$start_idx;
                                                }
                                                if($group_selected)
                                                {
                                                        if(!$this->isTokenSelected($counter, $selections))
                                                        {
                                                                $group_selected = false;
                                                        }
                                                }
                                        }
 
                                        $item_stack = array();
                                        $start_idx = $passage_start_idx;
                                        foreach($items_in_passage as $tmp_idx => $tmp_item)
                                        {
                                                $class = ( $this->isTokenSelected($counter, $selections) ?
                                                        "ilc_qetitem_ErrorTextSelected" : "ilc_qetitem_ErrorTextItem"
                                                );
                                                $item_stack[] = $this->getErrorTokenHtml($tmp_item, $class, $use_link_tags) . $img;
                                                $start_idx++;
                                        }
                                        $class = ( $this->isTokenSelected($counter, $selections) ?
                                                "ilc_qetitem_ErrorTextSelected" : "ilc_qetitem_ErrorTextItem"
                                        );
                                        if($graphicalOutput)
                                        {
                                                if ($group_selected)
                                                {
                                                        $img = ' <img src="' . ilUtil::getImagePath("icon_ok.svg") . '" alt="' . $this->lng->txt("answer_is_right") . '" title="' . $this->lng->txt("answer_is_right") . '" /> ';
                                                }
                                                else
                                                {
                                                        $img = ' <img src="' . ilUtil::getImagePath("icon_not_ok.svg") . '" alt="' . $this->lng->txt("answer_is_wrong") . '" title="' . $this->lng->txt("answer_is_wrong") . '" /> ';
                                                }
                                        }
                                        
                                        $item_stack[] = $this->getErrorTokenHtml($item, $class, $use_link_tags) . $img;
                                        $item_stack = trim(implode(" ", $item_stack));
                                        $item_stack = strlen($item_stack) ? $item_stack : '&nbsp;';
                                        
                                        if($graphicalOutput)
                                        {
                                                $items[$idx] = '<span class="selGroup">'.$item_stack.'</span>';
                                        }
                                        else
                                        {
                                                $items[$idx] = $item_stack;
                                        }
                                        
                                        $counter++;
                                        continue;
                                }
 
                                // Errors markes with #, group errors (()) are handled above
                                $class = 'ilc_qetitem_ErrorTextItem';
                                $img = '';
                                if($this->isTokenSelected($counter, $selections))
                                {
                                        $class = "ilc_qetitem_ErrorTextSelected";
                                        if($graphicalOutput)
                                        {
                                                if ($this->getPointsForSelectedPositions(array($counter)) > 0)
                                                {
                                                        $img = ' <img src="' . ilUtil::getImagePath("icon_ok.svg") . '" alt="' . $this->lng->txt("answer_is_right") . '" title="' . $this->lng->txt("answer_is_right") . '" /> ';
                                                }
                                                else
                                                {
                                                        $img = ' <img src="' . ilUtil::getImagePath("icon_not_ok.svg") . '" alt="' . $this->lng->txt("answer_is_wrong") . '" title="' . $this->lng->txt("answer_is_wrong") . '" /> ';
                                                }
                                        }
                                }
 
                                $items[$idx] = $this->getErrorTokenHtml($item, $class, $use_link_tags) . $img;
                                $counter++;
                        }
                        $textarray[$textidx] = '<p>' . implode(" ", $items) . '</p>';
                }
                
                return implode("\n", $textarray);
        }
        
        protected function isTokenSelected($counter, array $selection)
        {
                foreach($selection as $data)
                {
                        if( !is_array($data) )
                        {
                                if($counter == $data)
                                {
                                        return true;
                                }
                        }
                        elseif( in_array($counter, $data) )
                        {
                                return true;
                        }
                }
                
                return false;
        }
 
        public function createErrorTextExport($selections = null)
        {
                $counter = 0;
                $errorcounter = 0;
                include_once "./Services/Utilities/classes/class.ilStr.php";
                if (!is_array($selections)) $selections = array();
                $textarray = preg_split("/[\n\r]+/", $this->getErrorText());
                foreach ($textarray as $textidx => $text)
                {
                        $items = preg_split("/\s+/", $text);
                        foreach ($items as $idx => $item)
                        {
                                if (($posHash = strpos($item, '#')) === 0
                                        || ($posOpeningBrackets = strpos($item, '((')) === 0
                                        || ($posClosingBrackets = strpos($item, '))')) !== false) {
                                        /* (Word|Passage)-Marking delimiter found. */
 
                                        if ($posHash !== false)
                                                $item = ilStr::substr($item, 1, ilStr::strlen($item) - 1);
                                        elseif ($posOpeningBrackets !== false) {
                                                $item = ilStr::substr($item, 2, ilStr::strlen($item) - 2);
 
                                                /* Sometimes a closing bracket group needs
                                                   to be removed as well. */
                                                if (strpos($item, '))') !== false)
                                                        $item = ilStr::substr($item, 0, ilStr::strlen($item) - 2);
                                        }
                                        else{
                                                $appendComma = "";
                                                if ($item{$posClosingBrackets+2} == ',')
                                                        $appendComma = ",";
 
                                                $item = ilStr::substr($item, 0, $posClosingBrackets) . $appendComma;
                                        }
                                }
 
                                $word = "";
                                if (in_array($counter, $selections))
                                {
                                        $word .= '#';
                                }
                                $word .= ilUtil::prepareFormOutput($item);
                                if (in_array($counter, $selections))
                                {
                                        $word .= '#';
                                }
                                $items[$idx] = $word;
                                $counter++;
                        }
                        $textarray[$textidx] = join($items, " ");
                }
                return join($textarray, "\n");
        }
 
        public function getBestSelection($withPositivePointsOnly = true)
        {
                $passages       = array();
                $words          = array();
                $counter        = 0;
                $errorcounter = 0;
                $textarray = preg_split("/[\n\r]+/", $this->getErrorText());
                foreach ($textarray as $textidx => $text)
                {
                        $items          = preg_split("/\s+/", $text);
                        $inPassage  = false;
                        foreach ($items as $word)
                        {
                                $points = $this->getPointsWrong();
                                $isErrorItem = false;
                                if (strpos($word, '#') === 0)
                                {
                                        /* Word selection detected */
                                        $errorobject = $this->errordata[$errorcounter];
                                        if (is_object($errorobject))
                                        {
                                                $points = $errorobject->points;
                                                $isErrorItem = true;
                                        }
                                        $errorcounter++;
                                }
                                elseif (($posOpeningBracket = strpos($word, '((')) === 0
                                                || ($posClosingBracket = strpos($word, '))')) !== false
                                                || $inPassage)
                                {
                                        /* Passage selection detected */
 
                                        if ($posOpeningBracket !== false)
                                        {
                                                $passages[] = array('begin_pos' => $counter, 'cnt_words' => 0);
                                                $inPassage  = true;
                                        }
                                        elseif ($posClosingBracket !== false)
                                        {
                                                $inPassage = false;
                                                $cur_pidx  = count($passages) - 1;
                                                $passages[$cur_pidx]['end_pos'] = $counter;
 
                                                $errorobject = $this->errordata[$errorcounter];
                                                if (is_object($errorobject))
                                                {
                                                        $passages[$cur_pidx]['score'] = $errorobject->points;
                                                        $passages[$cur_pidx]['isError'] = true;
                                                }
                                                
                                                $errorcounter++;
                                        }
 
                                        $cur_pidx = count($passages) - 1;
                                        $passages[$cur_pidx]['cnt_words']++;
                                        $points = 0;
                                }
 
                                $words[$counter] = array("word" => $word, "points" => $points, "isError" => $isErrorItem);
                                $counter++;
                        }
                }
 
                $selections = array();
                foreach ($passages as $cnt => $pdata)
                {
                        if (!$withPositivePointsOnly && $pdata['isError'] || $withPositivePointsOnly && $pdata['score'] > 0)
                        {
                                $indexes = range($pdata['begin_pos'], $pdata['end_pos']);
                                $selections[$pdata['begin_pos']] = $indexes;
                        }
                }
 
                foreach ($words as $idx => $word)
                {
                        if (!$withPositivePointsOnly && $word['isError'] || $withPositivePointsOnly && $word['points'] > 0)
                        {
                                $selections[$idx] = array($idx);
                        }
                }
 
                ksort($selections);
                
                $selections = array_values($selections);
                
                return $selections;
        }
 
        protected function getPointsForSelectedPositions($positions)
        {
                $passages       = array();
                $words          = array();
                $counter        = 0;
                $errorcounter = 0;
                $textarray        = preg_split("/[\n\r]+/", $this->getErrorText());
                foreach ($textarray as $textidx => $text)
                {
                        $items          = preg_split("/\s+/", $text);
                        $inPassage  = false;
                        foreach ($items as $word)
                        {
                                $points  = $this->getPointsWrong();
                                if (strpos($word, '#') === 0)
                                {
                                        /* Word selection detected */
                                        $errorobject = $this->errordata[$errorcounter];
                                        if (is_object($errorobject))
                                        {
                                                $points = $errorobject->points;
                                        }
                                        $errorcounter++;
                                }
                                elseif (($posOpeningBracket = strpos($word, '((')) === 0
                                                || ($posClosingBracket = strpos($word, '))')) !== false
                                                || $inPassage)
                                {
                                        /* Passage selection detected */
 
                                        if ($posOpeningBracket !== false)
                                        {
                                                $passages[] = array('begin_pos' => $counter, 'cnt_words' => 0);
                                                $inPassage  = true;
                                        }
                                        elseif ($posClosingBracket !== false)
                                        {
                                                $inPassage = false;
                                                $cur_pidx  = count($passages) - 1;
                                                $passages[$cur_pidx]['end_pos'] = $counter;
 
                                                $errorobject = $this->errordata[$errorcounter];
                                                if (is_object($errorobject))
                                                {
                                                        $passages[$cur_pidx]['score'] = $errorobject->points;
                                                }
                                                $errorcounter++;
                                        }
 
                                        $cur_pidx = count($passages) - 1;
                                        $passages[$cur_pidx]['cnt_words']++;
                                        $points = 0;
                                }
 
                                $words[$counter] = array("word" => $word, "points" => $points);
                                $counter++;
                        }
                }
 
                /* Calculate reached points */
                $total           = 0;
                foreach ($positions as $position)
                {
                        /* First iterate through positions
                           to identify single-word-selections. */
 
                        $total += $words[$position]['points'];
                }
 
                foreach ($passages as $cnt => $p_data)
                {
                        /* Iterate through configured passages to check
                           wether the entire passage is selected or not.
                           The total points is incremented by the passage's
                           score only if the entire passage is selected. */
                        $isSelected = in_array($p_data['begin_pos'], $positions);
 
                        for ($i = 0; $i < $p_data['cnt_words']; $i++)
                        {
                                $current_pos = $p_data['begin_pos'] + $i;
                                $isSelected  = $isSelected && in_array($current_pos, $positions);
                        }
 
                        $total += $isSelected ? $p_data['score'] : 0;
                }
 
                return $total;
        }
 
        public function flushErrorData()
        {
                $this->errordata = array();
        }
 
        public function addErrorData($text_wrong, $text_correct, $points)
        {
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerErrorText.php";
                array_push($this->errordata, new assAnswerErrorText($text_wrong, $text_correct, $points));
        }
 
        public function getErrorData()
        {
                return $this->errordata;
        }
 
        public function getErrorText()
        {
                return $this->errortext;
        }
 
        public function setErrorText($a_value)
        {
                $this->errortext = $a_value;
        }
 
        public function getTextSize()
        {
                return $this->textsize;
        }
 
        public function setTextSize($a_value)
        {
                // in self-assesment-mode value should always be set (and must not be null)
                if($a_value === null)
                {
                        $a_value = 100;
                }
                $this->textsize = $a_value;
        }
 
        public function getPointsWrong()
        {
                return $this->points_wrong;
        }
 
        public function setPointsWrong($a_value)
        {
                $this->points_wrong = $a_value;
        }
 
        public function __get($value)
        {
                switch ($value)
                {
                        case "errortext":
                                return $this->getErrorText();
                                break;
                        case "textsize":
                                return $this->getTextSize();
                                break;
                        case "points_wrong":
                                return $this->getPointsWrong();
                                break;
                        default:
                                return parent::__get($value);
                                break;
                }
        }
 
        public function __set($key, $value)
        {
                switch ($key)
                {
                        case "errortext":
                                $this->setErrorText($value);
                                break;
                        case "textsize":
                                $this->setTextSize($value);
                                break;
                        case "points_wrong":
                                $this->setPointsWrong($value);
                                break;
                        default:
                                parent::__set($key, $value);
                                break;
                }
        }
 
 
        public function toJSON()
        {
                include_once("./Services/RTE/classes/class.ilRTE.php");
                $result = array();
                $result['id'] = (int) $this->getId();
                $result['type'] = (string) $this->getQuestionType();
                $result['title'] = (string) $this->getTitle();
                $result['question'] =  $this->formatSAQuestion($this->getQuestion());
                $result['text'] =  (string) ilRTE::_replaceMediaObjectImageSrc($this->getErrorText(), 0);
                $result['nr_of_tries'] = (int) $this->getNrOfTries();
                $result['shuffle'] = (bool) $this->getShuffle();
                $result['feedback'] = array(
                        'onenotcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), false)),
                        'allcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), true))
                );
 
                $answers = array();
                foreach ($this->getErrorData() as $idx => $answer_obj)
                {
                        array_push($answers, array(
                                "answertext_wrong" => (string) $answer_obj->text_wrong,
                                "answertext_correct" => (string) $answer_obj->text_correct,
                                "points" => (float)$answer_obj->points,
                                "order" => (int)$idx+1
                        ));
                }
                $result['correct_answers'] = $answers;
 
                $answers = array();
                $textarray = preg_split("/[\n\r]+/", $this->getErrorText());
                foreach ($textarray as $textidx => $text)
                {
                        $items = preg_split("/\s+/", trim($text));
                        foreach ($items as $idx => $item)
                        {
                                if(substr($item, 0, 1) == "#")
                                {
                                        $item = substr($item, 1);
                                        
                                        // #14115 - add position to correct answer 
                                        foreach($result["correct_answers"] as $aidx => $answer)
                                        {
                                                if($answer["answertext_wrong"] == $item && !$answer["pos"])
                                                {
                                                        $result["correct_answers"][$aidx]["pos"] = $this->getId()."_".$textidx."_".($idx+1);
                                                        break;
                                                }
                                        }
                                }
                                array_push($answers, array(
                                        "answertext" => (string) ilUtil::prepareFormOutput($item),
                                        "order" => $this->getId()."_".$textidx."_".($idx+1)
                                ));
                        }
                        if($textidx != sizeof($textarray)-1)
                        {
                                array_push($answers, array(
                                                "answertext" => "###",
                                                "order" => $this->getId()."_".$textidx."_".($idx+2)
                                        ));
                        }
                }
                $result['answers'] = $answers;
 
                $mobs = ilObjMediaObject::_getMobsOfObject("qpl:html", $this->getId());
                $result['mobs'] = $mobs;
                
                return json_encode($result);
        }
 
        public function getOperators($expression)
        {
                require_once "./Modules/TestQuestionPool/classes/class.ilOperatorsExpressionMapping.php";
                return ilOperatorsExpressionMapping::getOperatorsByExpression($expression);
        }
 
        public function getExpressionTypes()
        {
                return array(
                        iQuestionCondition::PercentageResultExpression,
                        iQuestionCondition::NumberOfResultExpression,
                        iQuestionCondition::EmptyAnswerExpression,
                        iQuestionCondition::ExclusiveResultExpression
                );
        }
 
        public function getUserQuestionResult($active_id, $pass)
        {
                global $ilDB;
                $result = new ilUserQuestionResult($this, $active_id, $pass);
 
                $data = $ilDB->queryF(
                        "SELECT value1+1 as value1 FROM tst_solutions WHERE active_fi = %s AND pass = %s AND question_fi = %s AND step = (
                                SELECT MAX(step) FROM tst_solutions WHERE active_fi = %s AND pass = %s AND question_fi = %s
                        )",
                        array("integer", "integer", "integer","integer", "integer", "integer"),
                        array($active_id, $pass, $this->getId(), $active_id, $pass, $this->getId())
                );
 
                while($row = $ilDB->fetchAssoc($data))
                {
                        $result->addKeyValue($row["value1"], $row["value1"]);
                }
 
                $points = $this->calculateReachedPoints($active_id, $pass);
                $max_points = $this->getMaximumPoints();
 
                $result->setReachedPercentage(($points/$max_points) * 100);
 
                return $result;
        }
 
        public function getAvailableAnswerOptions($index = null)
        {
                $error_text_array = explode(' ', $this->errortext);
                
                if($index !== null)
                {
                        if(array_key_exists($index, $error_text_array))
                        {
                                return $error_text_array[$index];
                        }
                        return null;
                }
                else
                {
                        return $error_text_array;
                }
        }
 
        private function getErrorTokenHtml($item, $class, $useLinkTags)
        {
                if($useLinkTags)
                {
                        return '<a class="' . $class . '" href="#">' . ($item == '&nbsp;' ? $item : ilUtil::prepareFormOutput($item)) . '</a>';
                }
                
                return '<span class="' . $class . '">' . ($item == '&nbsp;' ? $item : ilUtil::prepareFormOutput($item)) . '</span>';
        }
}