class.ilPCQuestion.php

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<?php

/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */


require_once("./Services/COPage/classes/class.ilPageContent.php");

class ilPCQuestion extends ilPageContent
{
        var $dom;
        var $q_node;                    // node of Paragraph element
        
        protected static $initial_done; // [bool]
        
        function init()
        {
                $this->setType("pcqst");
        }

        function setNode(&$a_node)
        {
                parent::setNode($a_node);               // this is the PageContent node
                $this->q_node =& $a_node->first_child();                //... and this the Question
        }

        function setQuestionReference($a_questionreference)
        {
                if (is_object($this->q_node))
                {
                        $this->q_node->set_attribute("QRef", $a_questionreference);
                }
        }

        function getQuestionReference()
        {
                if (is_object($this->q_node))
                {
                        return $this->q_node->get_attribute("QRef", $a_questionreference);
                }
                return false;
        }

        function create(&$a_pg_obj, $a_hier_id)
        {
                $this->createPageContentNode();
                $a_pg_obj->insertContent($this, $a_hier_id, IL_INSERT_AFTER);
                $this->q_node = $this->dom->create_element("Question");
                $this->q_node = $this->node->append_child($this->q_node);
                $this->q_node->set_attribute("QRef", "");
        }
        
        function copyPoolQuestionIntoPage($a_q_id, $a_hier_id)
        {
                include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
                $question = assQuestion::_instanciateQuestion($a_q_id);
                $duplicate_id = $question->copyObject(0, $question->getTitle());
                $duplicate = assQuestion::_instanciateQuestion($duplicate_id);
                $duplicate->setObjId(0);
                
                // we remove everything not supported by the non-tiny self
                // assessment question editor
                $q = $duplicate->getQuestion();

                // we try to save all latex tags
                $try = true;
                $ls = '<span class="latex">';
                $le = '</span>';
                while ($try)
                {
                        // search position of start tag
                        $pos1 = strpos($q, $ls);
                        if (is_int($pos1))
                        {
                                $pos2 = strpos($q, $le, $pos1);
                                if (is_int($pos2))
                                {
                                        // both found: replace end tag
                                        $q = substr($q, 0, $pos2)."[/tex]".substr($q, $pos2+7);
                                        $q = substr($q, 0, $pos1)."[tex]".substr($q, $pos1+20);
                                }
                                else
                                {
                                        $try = false;
                                }
                        }
                        else
                        {
                                $try = false;
                        }
                }
                
                $tags = assQuestionGUI::getSelfAssessmentTags();
                $tstr = "";
                foreach ($tags as $t)
                {
                        $tstr.="<".$t.">";
                }
                $q = ilUtil::secureString($q, true, $tstr);
                // self assessment uses nl2br, not p
                $duplicate->setQuestion($q);
                
                $duplicate->saveQuestionDataToDb();
                
                $this->q_node->set_attribute("QRef", "il__qst_".$duplicate_id);
        }
        
        static function getLangVars()
        {
                return array("ed_insert_pcqst", "empty_question", "pc_qst");
        }

        static function afterPageUpdate($a_page, DOMDocument $a_domdoc, $a_xml, $a_creation)
        {
                global $ilDB;
                
                include_once("./Services/Link/classes/class.ilInternalLink.php");
                
                $ilDB->manipulateF("DELETE FROM page_question WHERE page_parent_type = %s ".
                        " AND page_id = %s AND page_lang = %s", array("text", "integer", "text"),
                        array($a_page->getParentType(), $a_page->getId(), $a_page->getLanguage()));

                $xpath = new DOMXPath($a_domdoc);
                $nodes = $xpath->query('//Question');   
                $q_ids = array();
                foreach ($nodes as $node)
                {
                        $q_ref = $node->getAttribute("QRef");

                        $inst_id = ilInternalLink::_extractInstOfTarget($q_ref);
                        if (!($inst_id > 0))
                        {
                                $q_id = ilInternalLink::_extractObjIdOfTarget($q_ref);
                                if ($q_id > 0)
                                {
                                        $q_ids[$q_id] = $q_id;
                                }
                        }
                }
                foreach($q_ids as $qid)
                {
                        $ilDB->manipulateF("INSERT INTO page_question (page_parent_type, page_id, page_lang, question_id)".
                                " VALUES (%s,%s,%s,%s)",
                                array("text", "integer", "text", "integer"),
                                array($a_page->getParentType(), $a_page->getId(), $a_page->getLanguage(), $qid));
                }

        }
        
        static function beforePageDelete($a_page)
        {
                global $ilDB;
                
                $ilDB->manipulateF("DELETE FROM page_question WHERE page_parent_type = %s ".
                        " AND page_id = %s AND page_lang = %s", array("text", "integer", "text"),
                        array($a_page->getParentType(), $a_page->getId(), $a_page->getLanguage()));
        }
        
        static function _getQuestionIdsForPage($a_parent_type, $a_page_id, $a_lang = "-")
        {
                global $ilDB;

                $res = $ilDB->queryF("SELECT * FROM page_question WHERE page_parent_type = %s ".
                        " AND page_id = %s AND page_lang = %s",
                        array("text", "integer", "text"),
                        array($a_parent_type, $a_page_id, $a_lang));
                $q_ids = array();
                while ($rec = $ilDB->fetchAssoc($res))
                {
                        $q_ids[] = $rec["question_id"];
                }

                return $q_ids;
        }

        function _getPageForQuestionId($a_q_id, $a_parent_type = "")
        {
                global $ilDB;

                $set = $ilDB->query("SELECT * FROM page_question ".
                        " WHERE question_id = ".$ilDB->quote($a_q_id, "integer")
                        );
                while ($rec = $ilDB->fetchAssoc($set))
                {
                        if ($a_parent_type == "" || $rec["page_parent_type"] == $a_parent_type)
                        {
                                return array("page_id" => $rec["page_id"], "parent_type" => $rec["page_parent_type"]);
                        }
                }
                return false;
        }

        function modifyPageContentPostXsl($a_output, $a_mode)
        {
                global $lng;

                if ($this->getPage()->getPageConfig()->getEnableSelfAssessment())
                {
                        // #14154
                        $q_ids = $this->getPage()->getQuestionIds();
                        if(sizeof($q_ids))
                        {
                                include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
                                foreach($q_ids as $q_id)
                                {
                                        $q_gui = assQuestionGUI::_getQuestionGUI("", $q_id);
                                        // object check due to #16557
                                        if(is_object($q_gui->object) && !$q_gui->object->isComplete())
                                        {
                                                $a_output = str_replace("{{{{{Question;il__qst_".$q_id."}}}}}", 
                                                        "<i>".$lng->txt("cont_empty_question")."</i>", 
                                                        $a_output);
                                        }
                                }
                                
                                // this exports the questions which is needed below
                                $qhtml = $this->getQuestionJsOfPage(($a_mode == "edit") ? true : false, $a_mode);                       
                                                                                                                        
                                require_once './Modules/Scorm2004/classes/class.ilQuestionExporter.php';
                                $a_output = "<script>".ilQuestionExporter::questionsJS($q_ids)."</script>".$a_output;
                                if(!self::$initial_done)
                                {
                                        $a_output = "<script>var ScormApi=null; var questions = new Array();</script>".$a_output;
                                        self::$initial_done = true;
                                }                                                                                                       
                        }               
                }
                else
                {
                        // set by T&A components
                        $qhtml = $this->getPage()->getPageConfig()->getQuestionHTML();
                }

                if (is_array($qhtml))
                {
                        foreach ($qhtml as $k => $h)
                        {
                                $a_output = str_replace("{{{{{Question;il__qst_$k"."}}}}}", " ".$h, $a_output);
                        }
                }

                return $a_output;
        }

        static function resetInitialState()
        {
                self::$initial_done = false;
        }

        function getJavascriptFiles($a_mode)
        {
                $js_files = array();

                if ($this->getPage()->getPageConfig()->getEnableSelfAssessment())
                {
                        $js_files[] = "./Modules/Scorm2004/scripts/questions/pure.js";
                        $js_files[] = "./Modules/Scorm2004/scripts/questions/question_handling.js";
                        $js_files[] = "Modules/TestQuestionPool/js/ilMatchingQuestion.js";
                }

                if (!$this->getPage()->getPageConfig()->getEnableSelfAssessmentScorm() && $a_mode != IL_PAGE_PREVIEW
                        && $a_mode != "offline")
                {
                        $js_files[] = "./Services/COPage/js/ilCOPageQuestionHandler.js";
                }

                return $js_files;
        }

        function getCssFiles($a_mode)
        {
                if ($this->getPage()->getPageConfig()->getEnableSelfAssessment())
                {
                        return array("./Modules/Scorm2004/templates/default/question_handling.css",
                                "Modules/TestQuestionPool/templates/default/test_javascript.css");
                }
                return array();
        }

        function getOnloadCode($a_mode)
        {
                global $ilCtrl, $ilUser;

                $code = array();

                if ($this->getPage()->getPageConfig()->getEnableSelfAssessment())
                {
                        if (!$this->getPage()->getPageConfig()->getEnableSelfAssessmentScorm() && $a_mode != IL_PAGE_PREVIEW
                                && $a_mode != "offline")
                        {
                                $ilCtrl->setParameterByClass(strtolower(get_class($this->getPage()))."gui", "page_id", $this->getPage()->getId());
                                $url = $ilCtrl->getLinkTargetByClass(strtolower(get_class($this->getPage()))."gui", "processAnswer", "", true, false);
                                $code[] = "ilCOPageQuestionHandler.initCallback('".$url."');";
                        }

                        if ($this->getPage()->getPageConfig()->getDisableDefaultQuestionFeedback())
                        {
                                $code[] = "ilias.questions.default_feedback = false;";
                        }
                                                
                        $code[] = self::getJSTextInitCode($this->getPage()->getPageConfig()->getLocalizationLanguage()).' il.COPagePres.updateQuestionOverviews();';
                }

                $get_stored_tries = $this->getPage()->getPageConfig()->getUseStoredQuestionTries();
                if ($get_stored_tries)
                {
                        $q_ids = $this->getPage()->getQuestionIds();
                        if (count($q_ids) > 0)
                        {
                                foreach ($q_ids as $q_id)
                                {
                                        include_once("./Services/COPage/classes/class.ilPageQuestionProcessor.php");
                                        $as = ilPageQuestionProcessor::getAnswerStatus($q_id, $ilUser->getId());
                                        $code[] = "ilias.questions.initAnswer(".$q_id.", ".(int) $as["try"].", ".($as["passed"] ? "true" : "null").");";
                                }
                        }
                }
                return $code;
        }

        static function getJSTextInitCode($a_lang)
        {
                global $lng, $ilUser;

                if ($a_lang == "")
                {
                        $a_lang = $ilUser->getLanguage();
                }

                return
                        '
                        ilias.questions.txt.wrong_answers = "'.$lng->txtlng("content", "cont_wrong_answers", $a_lang).'";
                        ilias.questions.txt.wrong_answers_single = "'.$lng->txtlng("content", "cont_wrong_answers_single", $a_lang).'";
                        ilias.questions.txt.tries_remaining = "'.$lng->txtlng("content", "cont_tries_remaining", $a_lang).'";
                        ilias.questions.txt.please_try_again = "'.$lng->txtlng("content", "cont_please_try_again", $a_lang).'";
                        ilias.questions.txt.all_answers_correct = "'.$lng->txtlng("content", "cont_all_answers_correct", $a_lang).'";
                        ilias.questions.txt.enough_answers_correct = "'.$lng->txtlng("content", "cont_enough_answers_correct", $a_lang).'";
                        ilias.questions.txt.nr_of_tries_exceeded = "'.$lng->txtlng("content", "cont_nr_of_tries_exceeded", $a_lang).'";
                        ilias.questions.txt.correct_answers_shown = "'.$lng->txtlng("content", "cont_correct_answers_shown", $a_lang).'";
                        ilias.questions.txt.correct_answers_also = "'.$lng->txtlng("content", "cont_correct_answers_also", $a_lang).'";
                        ilias.questions.txt.correct_answer_also = "'.$lng->txtlng("content", "cont_correct_answer_also", $a_lang).'";
                        ilias.questions.txt.ov_all_correct = "'.$lng->txtlng("content", "cont_ov_all_correct", $a_lang).'";
                        ilias.questions.txt.ov_some_correct = "'.$lng->txtlng("content", "cont_ov_some_correct", $a_lang).'";
                        ilias.questions.txt.ov_wrong_answered = "'.$lng->txtlng("content", "cont_ov_wrong_answered", $a_lang).'";
                        ilias.questions.txt.please_select = "'.$lng->txtlng("content", "cont_please_select", $a_lang).'";
                        ilias.questions.refresh_lang();
                        ';

        }

        function getQuestionJsOfPage($a_no_interaction, $a_mode)
        {
                require_once './Modules/Scorm2004/classes/class.ilQuestionExporter.php';
                $q_ids = $this->getPage()->getQuestionIds();
                $js = array();
                if (count($q_ids) > 0)
                {
                        foreach ($q_ids as $q_id)
                        {
                                $q_exporter = new ilQuestionExporter($a_no_interaction);
                                $image_path = null;
                                if ($a_mode == "offline")
                                {
                                        if ($this->getPage()->getParentType() == "sahs")
                                        {
                                                $image_path = "./objects/";
                                        }
                                        if ($this->getPage()->getParentType() == "lm")
                                        {
                                                $image_path = "./assessment/0/".$q_id."/images/";
                                        }
                                }

                                $js[$q_id] = $q_exporter->exportQuestion($q_id, $image_path, $a_mode);
                        }
                }
                return $js;
        }

}
?>