format.php

来自「很棒的在线教学系统」· PHP 代码 · 共 801 行 · 第 1/3 页

            // there is usually only one exercise in a file

            if (method_exists($this, 'defaultquestion')) {
                $question = $this->defaultquestion();
            } else {
                $question = new stdClass();
                $question->usecase = 0; // Ignore case
                $question->image = "";  // No images with this format
            }
            $question->qtype = MATCH;
            $question->name = $this->hotpot_get_title($xml, $x);

            $question->questiontext = $this->hotpot_get_reading($xml);
            $question->questiontext .= $this->hotpot_get_instructions($xml);

            $question->subquestions = array();
            $question->subanswers = array();
            $p = 0;
            while (($pair = $exercise."['pair'][$p]['#']") && $xml->xml_value($tags, $pair)) {
                $left = $xml->xml_value($tags, $pair."['left-item'][0]['#']['text'][0]['#']");
                $right = $xml->xml_value($tags, $pair."['right-item'][0]['#']['text'][0]['#']");
                if ($left && $right) {
                    $match_count++;
                    $question->subquestions[$p] = $this->hotpot_prepare_str($left);
                    $question->subanswers[$p] = $this->hotpot_prepare_str($right);
                }
                $p++;
            }
            $question->defaultgrade = $match_count * $defaultgrade;
            $questions[] = $question;
            $x++;
        }
    }

    function process_jmix(&$xml, &$questions) {
        // define default grade (per segment)
        $defaultgrade = 1;
        $segment_count = 0;

        // xml tags to the start of the jumbled order exercise
        $tags = 'data,jumbled-order-exercise';

        $x = 0;
        while (($exercise = "[$x]['#']") && $xml->xml_value($tags, $exercise)) {
            // there is usually only one exercise in a file

            if (method_exists($this, 'defaultquestion')) {
                $question = $this->defaultquestion();
            } else {
                $question = new stdClass();
                $question->usecase = 0; // Ignore case
                $question->image = "";  // No images with this format
            }
            $question->qtype = SHORTANSWER;
            $question->name = $this->hotpot_get_title($xml, $x);

            $question->answer = array();
            $question->fraction = array();
            $question->feedback = array();

            $i = 0;
            $segments = array();
            while ($segment = $xml->xml_value($tags, $exercise."['main-order'][0]['#']['segment'][$i]['#']")) {
                $segments[] = $this->hotpot_prepare_str($segment);
                $segment_count++;
                $i++;
            }
            $answer = implode(' ', $segments);

            $this->hotpot_seed_RNG();
            shuffle($segments);

            $question->questiontext = $this->hotpot_get_reading($xml);
            $question->questiontext .= $this->hotpot_get_instructions($xml);
            $question->questiontext .= ' &nbsp; <NOBR><B>[ &nbsp; '.implode(' &nbsp; ', $segments).' &nbsp; ]</B></NOBR>';

            $a = 0;
            while (!empty($answer)) {
                $question->answer[$a] = $answer;
                $question->fraction[$a] = 1;
                $question->feedback[$a] = '';
                $answer = $this->hotpot_prepare_str($xml->xml_value($tags, $exercise."['alternate'][$a]['#']"));
                $a++;
            }
            $question->defaultgrade = $segment_count * $defaultgrade;
            $questions[] = $question;
            $x++;
        }
    }
    function process_jquiz(&$xml, &$questions) {
        // define default grade (per question)
        $defaultgrade = 1;

        // xml tags to the start of the questions
        $tags = 'data,questions';

        $x = 0;
        while (($exercise = "[$x]['#']") && $xml->xml_value($tags, $exercise)) {
            // there is usually only one 'questions' object in a single exercise

            $q = 0;
            while (($question_record = $exercise."['question-record'][$q]['#']") && $xml->xml_value($tags, $question_record)) {

                if (method_exists($this, 'defaultquestion')) {
                    $question = $this->defaultquestion();
                } else {
                    $question = new stdClass();
                    $question->usecase = 0; // Ignore case
                    $question->image = "";  // No images with this format
                }
                $question->defaultgrade = $defaultgrade;
                $question->name = $this->hotpot_get_title($xml, $q, true);

                $text = $xml->xml_value($tags, $question_record."['question'][0]['#']");
                $question->questiontext = $this->hotpot_prepare_str($text);

                if ($xml->xml_value($tags, $question_record."['answers']")) {
                    // HP6 JQuiz
                    $answers = $question_record."['answers'][0]['#']";
                } else {
                    // HP5 JBC or JQuiz
                    $answers = $question_record;
                }
                if($xml->xml_value($tags, $question_record."['question-type']")) {
                    // HP6 JQuiz
                    $type = $xml->xml_value($tags, $question_record."['question-type'][0]['#']");
                    //  1 : multiple choice
                    //  2 : short-answer
                    //  3 : hybrid
                    //  4 : multiple select
                } else {
                    // HP5
                    switch ($xml->quiztype) {
                        case 'jbc':
                            $must_select_all = $xml->xml_value($tags, $question_record."['must-select-all'][0]['#']");
                            if (empty($must_select_all)) {
                                $type = 1; // multichoice
                            } else {
                                $type = 4; // multiselect
                            }
                            break;
                        case 'jquiz':
                            $type = 2; // shortanswer
                            break;
                        default:
                            $type = 0; // unknown
                    }
                }
                $question->qtype = ($type==2 ? SHORTANSWER : MULTICHOICE);
                $question->single = ($type==4 ? 0 : 1);

                // workaround required to calculate scores for multiple select answers
                $no_of_correct_answers = 0;
                if ($type==4) {
                    $a = 0;
                    while (($answer = $answers."['answer'][$a]['#']") && $xml->xml_value($tags, $answer)) {
                        $correct = $xml->xml_value($tags, $answer."['correct'][0]['#']");
                        if (empty($correct)) {
                            // do nothing
                        } else {
                            $no_of_correct_answers++;
                        }
                        $a++;
                    }
                }
                $a = 0;
                $question->answer = array();
                $question->fraction = array();
                $question->feedback = array();
                $aa = 0;
                $correct_answers = array();
                $correct_answers_all_zero = true;
                while (($answer = $answers."['answer'][$a]['#']") && $xml->xml_value($tags, $answer)) {
                    $correct = $xml->xml_value($tags, $answer."['correct'][0]['#']");
                    if (empty($correct)) {
                        $fraction = 0;
                    } else if ($type==4) { // multiple select
                        // strange behavior if the $fraction isn't exact to 5 decimal places
                        $fraction = round(1/$no_of_correct_answers, 5);
                    } else {
                        if ($xml->xml_value($tags, $answer."['percent-correct']")) {
                            // HP6 JQuiz
                            $percent = $xml->xml_value($tags, $answer."['percent-correct'][0]['#']");
                            $fraction = $percent/100;
                        } else {
                            // HP5 JBC or JQuiz
                            $fraction = 1;
                        }
                    }
                    $answertext = $this->hotpot_prepare_str($xml->xml_value($tags, $answer."['text'][0]['#']"));
                    if ($answertext!='') {
                        $question->answer[$aa] = $answertext;
                        $question->fraction[$aa] = $fraction;
                        $question->feedback[$aa] = $this->hotpot_prepare_str($xml->xml_value($tags, $answer."['feedback'][0]['#']"));
                        if ($correct) {
                            if ($fraction) {
                                $correct_answers_all_zero = false;
                            }
                            $correct_answers[] = $aa;
                        }
                        $aa++;
                    }
                    $a++;
                }
                if ($correct_answers_all_zero) {
                    // correct answers all have score of 0%, 
                    // so reset score for correct answers 100%
                    foreach ($correct_answers as $aa) {
                        $question->fraction[$aa] = 1;
                    }
                }
                // add a sanity check for empty questions, see MDL-17779
                if (!empty($question->questiontext)) {
                    $questions[] = $question;
                }
                $q++;
            }
            $x++;
        }
    }

    function hotpot_seed_RNG() {
        // seed the random number generator
        static $HOTPOT_SEEDED_RNG = FALSE;
        if (!$HOTPOT_SEEDED_RNG) {
            srand((double) microtime() * 1000000);
            $HOTPOT_SEEDED_RNG = TRUE;
        }
    }
    function hotpot_get_title(&$xml, $x, $flag=false) {
        $title = $xml->xml_value('data,title');
        if ($x || $flag) {
            $title .= ' ('.($x+1).')';
        }
        return $this->hotpot_prepare_str($title);
    }
    function hotpot_get_instructions(&$xml) {
        $text = $xml->xml_value('hotpot-config-file,instructions');
        if (empty($text)) {
            $text = "Hot Potatoes $xml->quiztype";
        }
        return $this->hotpot_prepare_str($text);
    }
    function hotpot_get_reading(&$xml) {
        $str = '';
        $tags = 'data,reading';
        if ($xml->xml_value("$tags,include-reading")) {
            if ($title = $xml->xml_value("$tags,reading-title")) {
                $str .= "<H3>$title</H3>";
            }
            if ($text = $xml->xml_value("$tags,reading-text")) {
                $str .= "<P>$text</P>";
            }
        }
        return $this->hotpot_prepare_str($str);
    }
    function hotpot_prepare_str($str) {
        // convert html entities to unicode and add slashes
        $str = preg_replace('/&#x([0-9a-f]+);/ie', "hotpot_charcode_to_utf8(hexdec('\\1'))", $str);
        $str = preg_replace('/&#([0-9]+);/e', "hotpot_charcode_to_utf8(\\1)", $str);
        return addslashes($str);
    }
} // end class

// get the standard XML parser supplied with Moodle
require_once("$CFG->libdir/xmlize.php");