class.ilAssSelfAssessmentQuestionFormatter.php

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<?php
/* Copyright (c) 1998-2017 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once 'Modules/TestQuestionPool/interfaces/interface.ilAssSelfAssessmentMigrator.php';

class ilAssSelfAssessmentQuestionFormatter implements ilAssSelfAssessmentMigrator
{
        public function format($string)
        {
                $string = $this->handleLineBreaks($string);

                require_once 'Services/RTE/classes/class.ilRTE.php';
                $string = (string) ilRTE::_replaceMediaObjectImageSrc($string, 1);

                $string = str_replace("</li><br />", "</li>", $string);
                $string = str_replace("</li><br>", "</li>", $string);

                require_once 'Services/MathJax/classes/class.ilMathJax.php';
                $string = ilMathJax::getInstance()->insertLatexImages($string, "\[tex\]", "\[\/tex\]");
                $string = ilMathJax::getInstance()->insertLatexImages($string, "<span class\=\"latex\">", "<\/span>");

                $string = str_replace('{', '&#123;', $string);
                $string = str_replace('}', '&#125;', $string);

                return $string;
        }

        protected function handleLineBreaks($string)
        {
                if( !ilUtil::isHTML($string) )
                {
                        $string = nl2br($string);
                }

                return $string;
        }
        
        protected function convertLatexSpanToTex($string)
        {
                // we try to save all latex tags
                $try = true;
                $ls = '<span class="latex">';
                $le = '</span>';
                while ($try)
                {
                        // search position of start tag
                        $pos1 = strpos($string, $ls);
                        if (is_int($pos1))
                        {
                                $pos2 = strpos($string, $le, $pos1);
                                if (is_int($pos2))
                                {
                                        // both found: replace end tag
                                        $string = substr($string, 0, $pos2)."[/tex]".substr($string, $pos2+7);
                                        $string = substr($string, 0, $pos1)."[tex]".substr($string, $pos1+20);
                                }
                                else
                                {
                                        $try = false;
                                }
                        }
                        else
                        {
                                $try = false;
                        }
                }

                return $string;
        }
        
        protected function stripHtmlExceptSelfAssessmentTags($string)
        {
                $tags = self::getSelfAssessmentTags();

                $tstr = "";
                
                foreach ($tags as $t)
                {
                        $tstr.="<".$t.">";
                }

                $string = ilUtil::secureString($string, true, $tstr);

                return $string;
        }
        
        public function migrateToLmContent($string)
        {
                $string = $this->convertLatexSpanToTex($string);
                $string = $this->stripHtmlExceptSelfAssessmentTags($string);
                return $string;
        }
        
        public static function prepareQuestionForLearningModule(assQuestion $question)
        {
                $question->migrateContentForLearningModule(new self());
        }
        
        static function getSelfAssessmentTags()
        {
                // set tags we allow in self assessment mode
                $st = ilUtil::getSecureTags();
                
                // we allow these tags, since they are typically used in the Tiny Assessment editor
                // and should not be deleted, if questions are copied from pools to learning modules
                $not_supported = array("img", "p");
                $tags = array();
                
                $tags[] = 'p';
                
                foreach ($st as $s)
                {
                        if (!in_array($s, $not_supported))
                        {
                                $tags[] = $s;
                        }
                }
                
                return $tags;
        }
}