class.assMultipleChoiceExport.php

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<?php

class assMultipleChoiceExport extends assQuestionExport
{
    public function toXML($a_include_header = true, $a_include_binary = true, $a_shuffle = false, $test_output = false, $force_image_references = false): string
    {
        global $DIC;
        $ilias = $DIC['ilias'];

        $a_xml_writer = new ilXmlWriter();
        // set xml header
        $a_xml_writer->xmlHeader();
        $a_xml_writer->xmlStartTag("questestinterop");
        $attrs = [
            "ident" => "il_" . IL_INST_ID . "_qst_" . $this->object->getId(),
            "title" => $this->object->getTitle(),
            "maxattempts" => $this->object->getNrOfTries()
        ];
        $a_xml_writer->xmlStartTag("item", $attrs);
        // add question description
        $a_xml_writer->xmlElement("qticomment", null, $this->object->getComment());
        $a_xml_writer->xmlStartTag("itemmetadata");
        $a_xml_writer->xmlStartTag("qtimetadata");
        $a_xml_writer->xmlStartTag("qtimetadatafield");
        $a_xml_writer->xmlElement("fieldlabel", null, "ILIAS_VERSION");
        $a_xml_writer->xmlElement("fieldentry", null, $ilias->getSetting("ilias_version"));
        $a_xml_writer->xmlEndTag("qtimetadatafield");
        $a_xml_writer->xmlStartTag("qtimetadatafield");
        $a_xml_writer->xmlElement("fieldlabel", null, "QUESTIONTYPE");
        $a_xml_writer->xmlElement("fieldentry", null, MULTIPLE_CHOICE_QUESTION_IDENTIFIER);
        $a_xml_writer->xmlEndTag("qtimetadatafield");
        $a_xml_writer->xmlStartTag("qtimetadatafield");
        $a_xml_writer->xmlElement("fieldlabel", null, "AUTHOR");
        $a_xml_writer->xmlElement("fieldentry", null, $this->object->getAuthor());
        $a_xml_writer->xmlEndTag("qtimetadatafield");

        // additional content editing information
        $this->addAdditionalContentEditingModeInformation($a_xml_writer);
        $this->addGeneralMetadata($a_xml_writer);

        $a_xml_writer->xmlStartTag("qtimetadatafield");
        $a_xml_writer->xmlElement("fieldlabel", null, "thumb_size");
        $a_xml_writer->xmlElement("fieldentry", null, $this->object->getThumbSize());
        $a_xml_writer->xmlEndTag("qtimetadatafield");

        $a_xml_writer->xmlStartTag("qtimetadatafield");
        $a_xml_writer->xmlElement("fieldlabel", null, "feedback_setting");
        $a_xml_writer->xmlElement("fieldentry", null, $this->object->getSpecificFeedbackSetting());
        $a_xml_writer->xmlEndTag("qtimetadatafield");

        $this->addQtiMetaDataField($a_xml_writer, 'singleline', $this->object->isSingleline() ? 1 : 0);

        $a_xml_writer->xmlEndTag("qtimetadata");
        $a_xml_writer->xmlEndTag("itemmetadata");

        // PART I: qti presentation
        $attrs = [
            "label" => $this->object->getTitle()
        ];
        $a_xml_writer->xmlStartTag("presentation", $attrs);
        // add flow to presentation
        $a_xml_writer->xmlStartTag("flow");
        // add material with question text to presentation
        $this->addQTIMaterial($a_xml_writer, $this->object->getQuestion());
        // add answers to presentation
        $attrs = [
            "ident" => "MCMR",
            "rcardinality" => "Multiple"
        ];
        $a_xml_writer->xmlStartTag("response_lid", $attrs);
        $a_xml_writer = $this->addSuggestedSolution($a_xml_writer);
        // shuffle output and max choice
        $attrs = ['shuffle' => $this->object->getShuffle() ? 'Yes' : 'No'];
        if ($this->object->getSelectionLimit()) {
            $attrs['minnumber'] = '0';
            $attrs['maxnumber'] = (string) $this->object->getSelectionLimit();
        }
        $a_xml_writer->xmlStartTag("render_choice", $attrs);
        $answers = &$this->object->getAnswers();
        $akeys = array_keys($answers);
        if ($this->object->getShuffle() && $a_shuffle) {
            $akeys = shuffle($akeys);
        }
        // add answers
        foreach ($akeys as $index) {
            $answer = $answers[$index];
            $attrs = [
                "ident" => $index
            ];
            $a_xml_writer->xmlStartTag("response_label", $attrs);

            if ($answer->hasImage()) {
                $this->addQTIMaterial($a_xml_writer, $answer->getAnswertext(), false, false);
                $imagetype = "image/jpeg";
                if (preg_match("/.*\.(png|gif)$/", $answer->getImage(), $matches)) {
                    $imagetype = "image/" . $matches[1];
                }
                if ($force_image_references) {
                    $attrs = [
                        "imagtype" => $imagetype,
                        "label" => $answer->getImage(),
                        "uri" => $this->object->getImagePathWeb() . $answer->getImage()
                    ];
                    $a_xml_writer->xmlElement("matimage", $attrs);
                } else {
                    $imagepath = $this->object->getImagePath() . $answer->getImage();
                    $fh = @fopen($imagepath, "rb");
                    if ($fh != false) {
                        $imagefile = fread($fh, filesize($imagepath));
                        fclose($fh);
                        $base64 = base64_encode($imagefile);
                        $attrs = [
                            "imagtype" => $imagetype,
                            "label" => $answer->getImage(),
                            "embedded" => "base64"
                        ];
                        $a_xml_writer->xmlElement("matimage", $attrs, $base64, false, false);
                    }
                }
                $a_xml_writer->xmlEndTag("material");
            } else {
                $this->addQTIMaterial($a_xml_writer, $answer->getAnswertext());
            }
            $a_xml_writer->xmlEndTag("response_label");
        }
        $a_xml_writer->xmlEndTag("render_choice");
        $a_xml_writer->xmlEndTag("response_lid");
        $a_xml_writer->xmlEndTag("flow");
        $a_xml_writer->xmlEndTag("presentation");

        // PART II: qti resprocessing
        $a_xml_writer->xmlStartTag("resprocessing");
        $a_xml_writer->xmlStartTag("outcomes");
        $a_xml_writer->xmlStartTag("decvar");
        $a_xml_writer->xmlEndTag("decvar");
        $a_xml_writer->xmlEndTag("outcomes");
        // add response conditions
        foreach ($answers as $index => $answer) {
            $attrs = [
                "continue" => "Yes"
            ];
            $a_xml_writer->xmlStartTag("respcondition", $attrs);
            // qti conditionvar
            $a_xml_writer->xmlStartTag("conditionvar");
            $attrs = [
                "respident" => "MCMR"
            ];
            $a_xml_writer->xmlElement("varequal", $attrs, $index);
            $a_xml_writer->xmlEndTag("conditionvar");
            // qti setvar
            $attrs = [
                "action" => "Add"
            ];
            $a_xml_writer->xmlElement("setvar", $attrs, $answer->getPoints());
            // qti displayfeedback
            $linkrefid = "response_$index";
            $attrs = [
                "feedbacktype" => "Response",
                "linkrefid" => $linkrefid
            ];
            $a_xml_writer->xmlElement("displayfeedback", $attrs);
            $a_xml_writer->xmlEndTag("respcondition");
            $attrs = [
                "continue" => "Yes"
            ];
            $a_xml_writer->xmlStartTag("respcondition", $attrs);

            // qti conditionvar
            $a_xml_writer->xmlStartTag("conditionvar");
            $attrs = [
                "respident" => "MCMR"
            ];
            $a_xml_writer->xmlStartTag("not");
            $a_xml_writer->xmlElement("varequal", $attrs, $index);
            $a_xml_writer->xmlEndTag("not");
            $a_xml_writer->xmlEndTag("conditionvar");
            // qti setvar
            $attrs = [
                "action" => "Add"
            ];
            $a_xml_writer->xmlElement("setvar", $attrs, $answer->getPointsUnchecked());
            $a_xml_writer->xmlEndTag("respcondition");
        }
        $feedback_allcorrect = $this->object->feedbackOBJ->getGenericFeedbackExportPresentation(
            $this->object->getId(),
            true
        );
        if (strlen($feedback_allcorrect)) {
            $attrs = [
                "continue" => "Yes"
            ];
            $a_xml_writer->xmlStartTag("respcondition", $attrs);
            // qti conditionvar
            $a_xml_writer->xmlStartTag("conditionvar");
            foreach ($answers as $index => $answer) {
                if ($answer->getPointsChecked() < $answer->getPointsUnchecked()) {
                    $a_xml_writer->xmlStartTag("not");
                }
                $attrs = [
                    "respident" => "MCMR"
                ];
                $a_xml_writer->xmlElement("varequal", $attrs, $index);
                if ($answer->getPointsChecked() < $answer->getPointsUnchecked()) {
                    $a_xml_writer->xmlEndTag("not");
                }
            }
            $a_xml_writer->xmlEndTag("conditionvar");
            // qti displayfeedback
            $attrs = [
                "feedbacktype" => "Response",
                "linkrefid" => "response_allcorrect"
            ];
            $a_xml_writer->xmlElement("displayfeedback", $attrs);
            $a_xml_writer->xmlEndTag("respcondition");
        }
        $feedback_onenotcorrect = $this->object->feedbackOBJ->getGenericFeedbackExportPresentation(
            $this->object->getId(),
            false
        );
        if (strlen($feedback_onenotcorrect)) {
            $attrs = [
                "continue" => "Yes"
            ];
            $a_xml_writer->xmlStartTag("respcondition", $attrs);
            // qti conditionvar
            $a_xml_writer->xmlStartTag("conditionvar");
            foreach ($answers as $index => $answer) {
                if ($index > 0) {
                    $a_xml_writer->xmlStartTag("or");
                }
                if ($answer->getPointsChecked() >= $answer->getPointsUnchecked()) {
                    $a_xml_writer->xmlStartTag("not");
                }
                $attrs = [
                    "respident" => "MCMR"
                ];
                $a_xml_writer->xmlElement("varequal", $attrs, $index);
                if ($answer->getPointsChecked() >= $answer->getPointsUnchecked()) {
                    $a_xml_writer->xmlEndTag("not");
                }
                if ($index > 0) {
                    $a_xml_writer->xmlEndTag("or");
                }
            }
            $a_xml_writer->xmlEndTag("conditionvar");
            // qti displayfeedback
            $attrs = [
                "feedbacktype" => "Response",
                "linkrefid" => "response_onenotcorrect"
            ];
            $a_xml_writer->xmlElement("displayfeedback", $attrs);
            $a_xml_writer->xmlEndTag("respcondition");
        }
        $a_xml_writer->xmlEndTag("resprocessing");

        // PART III: qti itemfeedback
        foreach ($answers as $index => $answer) {
            $linkrefid = "response_$index";
            $attrs = [
                "ident" => $linkrefid,
                "view" => "All"
            ];
            $a_xml_writer->xmlStartTag("itemfeedback", $attrs);
            // qti flow_mat
            $a_xml_writer->xmlStartTag("flow_mat");
            $fb = $this->object->feedbackOBJ->getSpecificAnswerFeedbackExportPresentation(
                $this->object->getId(),
                0,
                $index
            );
            $this->addQTIMaterial($a_xml_writer, $fb);
            $a_xml_writer->xmlEndTag("flow_mat");
            $a_xml_writer->xmlEndTag("itemfeedback");
        }
        if (strlen($feedback_allcorrect)) {
            $attrs = [
                "ident" => "response_allcorrect",
                "view" => "All"
            ];
            $a_xml_writer->xmlStartTag("itemfeedback", $attrs);
            // qti flow_mat
            $a_xml_writer->xmlStartTag("flow_mat");
            $this->addQTIMaterial($a_xml_writer, $feedback_allcorrect);
            $a_xml_writer->xmlEndTag("flow_mat");
            $a_xml_writer->xmlEndTag("itemfeedback");
        }
        if (strlen($feedback_onenotcorrect)) {
            $attrs = [
                "ident" => "response_onenotcorrect",
                "view" => "All"
            ];
            $a_xml_writer->xmlStartTag("itemfeedback", $attrs);
            // qti flow_mat
            $a_xml_writer->xmlStartTag("flow_mat");
            $this->addQTIMaterial($a_xml_writer, $feedback_onenotcorrect);
            $a_xml_writer->xmlEndTag("flow_mat");
            $a_xml_writer->xmlEndTag("itemfeedback");
        }

        $a_xml_writer = $this->addSolutionHints($a_xml_writer);

        $a_xml_writer->xmlEndTag("item");
        $a_xml_writer->xmlEndTag("questestinterop");

        $xml = $a_xml_writer->xmlDumpMem(false);
        if (!$a_include_header) {
            $pos = strpos($xml, "?>");
            $xml = substr($xml, $pos + 2);
        }
        return $xml;
    }
}