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<?php // $Id: format.php,v 1.2 2006/03/01 07:36:08 gustav_delius Exp $
// Alton College, Hampshire, UK - Tom Flannaghan, Andrew Walker
// Imports learnwise multiple choice quizzes (single and multiple answers)
// currently ignores the deduct attribute for multiple answer questions
// deductions are currently simply found by dividing the award for the incorrect
// answer by the total number of options
// Based on format.php, included by ../../import.php
class qformat_learnwise extends qformat_default {
function provide_import() {
return true;
}
function readquestions($lines) {
$questions = array();
$currentquestion = array();
foreach($lines as $line) {
$line = trim($line);
$currentquestion[] = $line;
if ($question = $this->readquestion($currentquestion)) {
$questions[] = $question;
$currentquestion = array();
}
}
return $questions;
}
function readquestion($lines) {
$text = implode(' ', $lines);
$text = str_replace(array('\t','\n','\r','\''), array('','','','\\\''), $text);
$startpos = strpos($text, '<question type');
$endpos = strpos($text, '</question>');
if ($startpos === false || $endpos === false) {
return false;
}
preg_match("/<question type=[\"\']([^\"\']+)[\"\']>/i", $text, $matches);
$type = strtolower($matches[1]); // multichoice or multianswerchoice
$questiontext = $this->unhtmlentities($this->stringbetween($text, '<text>', '</text>'));
$questionhint = $this->unhtmlentities($this->stringbetween($text, '<hint>', '</hint>'));
$questionaward = $this->stringbetween($text, '<award>', '</award>');
$optionlist = $this->stringbetween($text, '<answer>', '</answer>');
$optionlist = explode('<option', $optionlist);
$n = 0;
$optionscorrect = array();
$optionstext = array();
if ($type == 'multichoice') {
foreach ($optionlist as $option) {
$correct = $this->stringbetween($option, ' correct="', '">');
$answer = $this->stringbetween($option, '">', '</option>');
$optionscorrect[$n] = $correct;
$optionstext[$n] = $this->unhtmlentities($answer);
++$n;
}
} else if ($type == 'multianswerchoice') {
$numcorrect = 0;
$totalaward = 0;
$optionsaward = array();
foreach ($optionlist as $option) {
preg_match("/correct=\"([^\"]*)\"/i", $option, $correctmatch);
preg_match("/award=\"([^\"]*)\"/i", $option, $awardmatch);
$correct = $correctmatch[1];
$award = $awardmatch[1];
if ($correct == 'yes') {
$totalaward += $award;
++$numcorrect;
}
$answer = $this->stringbetween($option, '">', '</option>');
$optionscorrect[$n] = $correct;
$optionstext[$n] = $this->unhtmlentities($answer);
$optionsaward[$n] = $award;
++$n;
}
} else {
echo "<p>I don't understand this question type (type = <strong>$type</strong>).</p>\n";
}
$question = $this->defaultquestion();
$question->qtype = MULTICHOICE;
$question->name = substr($questiontext, 0, 30);
if (strlen($questiontext) > 30) {
$question->name .= '...';
}
$question->questiontext = $questiontext;
$question->single = ($type == 'multichoice') ? 1 : 0;
$question->feedback[] = '';
$question->fraction = array();
$question->answer = array();
for ($n = 0; $n < count($optionstext); ++$n) {
if ($optionstext[$n]) {
if (!isset($numcorrect)) { // single answer
if ($optionscorrect[$n] == 'yes') {
$fraction = (int) $questionaward;
} else {
$fraction = 0;
}
} else { // mulitple answers
if ($optionscorrect[$n] == 'yes') {
$fraction = $optionsaward[$n] / $totalaward;
} else {
$fraction = -$optionsaward[$n] / count($optionstext);
}
}
$question->fraction[] = $fraction;
$question->answer[] = $optionstext[$n];
$question->feedback[] = ''; // no feedback in this type
}
}
return $question;
}
function stringbetween($text, $start, $end) {
$startpos = strpos($text, $start) + strlen($start);
$endpos = strpos($text, $end);
if ($startpos <= $endpos) {
return substr($text, $startpos, $endpos - $startpos);
}
}
function unhtmlentities($string) {
$transtable = get_html_translation_table(HTML_ENTITIES);
$transtable = array_flip($transtable);
return strtr($string, $transtable);
}
}
?>
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