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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Examview question importer.
*
* @package qformat_examview
* @copyright 2005 Howard Miller
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir . '/xmlize.php');
/**
* Examview question importer.
*
* @copyright 2005 Howard Miller
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qformat_examview extends qformat_based_on_xml {
public $qtypes = array(
'tf' => 'truefalse',
'mc' => 'multichoice',
'yn' => 'truefalse',
'co' => 'shortanswer',
'ma' => 'match',
'mtf' => 99,
'nr' => 'numerical',
'pr' => 99,
'es' => 'essay',
'ca' => 99,
'ot' => 99,
'sa' => 'shortanswer',
);
public $matchingquestions = array();
public function provide_import() {
return true;
}
public function mime_type() {
return 'application/xml';
}
/**
* unxmlise reconstructs part of the xml data structure in order
* to identify the actual data therein
* @param array $xml section of the xml data structure
* @return string data with evrything else removed
*/
protected function unxmlise( $xml ) {
// If it's not an array then it's probably just data.
if (!is_array($xml)) {
$text = s($xml);
} else {
// Otherwise parse the array.
$text = '';
foreach ($xml as $tag => $data) {
// If tag is '@' then it's attributes and we don't care.
if ($tag!=='@') {
$text = $text . $this->unxmlise( $data );
}
}
}
// Currently we throw the tags we found.
$text = strip_tags($text);
return $text;
}
public function parse_matching_groups($matchinggroups) {
if (empty($matchinggroups)) {
return;
}
foreach ($matchinggroups as $matchgroup) {
$newgroup = new stdClass();
$groupname = trim($matchgroup['@']['name']);
$questiontext = $this->unxmlise($matchgroup['#']['text'][0]['#']);
$newgroup->questiontext = trim($questiontext);
$newgroup->subchoices = array();
$newgroup->subquestions = array();
$newgroup->subanswers = array();
$choices = $matchgroup['#']['choices']['0']['#'];
foreach ($choices as $key => $value) {
if (strpos(trim($key), 'choice-') !== false) {
$key = strtoupper(trim(str_replace('choice-', '', $key)));
$newgroup->subchoices[$key] = trim($value['0']['#']);
}
}
$this->matching_questions[$groupname] = $newgroup;
}
}
protected function parse_ma($qrec, $groupname) {
$matchgroup = $this->matching_questions[$groupname];
$phrase = trim($this->unxmlise($qrec['text']['0']['#']));
$answer = trim($this->unxmlise($qrec['answer']['0']['#']));
$answer = strip_tags( $answer );
$matchgroup->mappings[$phrase] = $matchgroup->subchoices[$answer];
$this->matching_questions[$groupname] = $matchgroup;
return null;
}
protected function process_matches(&$questions) {
if (empty($this->matching_questions)) {
return;
}
foreach ($this->matching_questions as $matchgroup) {
$question = $this->defaultquestion();
$htmltext = s($matchgroup->questiontext);
$question->questiontext = $htmltext;
$question->questiontextformat = FORMAT_HTML;
$question->questiontextfiles = array();
$question->name = $this->create_default_question_name($question->questiontext, get_string('questionname', 'question'));
$question->qtype = 'match';
$question = $this->add_blank_combined_feedback($question);
$question->subquestions = array();
$question->subanswers = array();
foreach ($matchgroup->subchoices as $subchoice) {
$fiber = array_keys ($matchgroup->mappings, $subchoice);
$subquestion = '';
foreach ($fiber as $subquestion) {
$question->subquestions[] = $this->text_field($subquestion);
$question->subanswers[] = $subchoice;
}
if ($subquestion == '') { // Then in this case, $subchoice is a distractor.
$question->subquestions[] = $this->text_field('');
$question->subanswers[] = $subchoice;
}
}
$questions[] = $question;
}
}
protected function cleanunicode($text) {
return str_replace('’', "'", $text);
}
public function readquestions($lines) {
// Parses an array of lines into an array of questions,
// where each item is a question object as defined by
// readquestion().
$questions = array();
$currentquestion = array();
$text = implode(' ', $lines);
$text = $this->cleanunicode($text);
$xml = xmlize($text, 0);
if (!empty($xml['examview']['#']['matching-group'])) {
$this->parse_matching_groups($xml['examview']['#']['matching-group']);
}
$questionnode = $xml['examview']['#']['question'];
foreach ($questionnode as $currentquestion) {
if ($question = $this->readquestion($currentquestion)) {
$questions[] = $question;
}
}
$this->process_matches($questions);
return $questions;
}
public function readquestion($qrec) {
global $OUTPUT;
$type = trim($qrec['@']['type']);
$question = $this->defaultquestion();
if (array_key_exists($type, $this->qtypes)) {
$question->qtype = $this->qtypes[$type];
} else {
$question->qtype = null;
}
$question->single = 1;
// Only one answer is allowed.
$htmltext = $this->unxmlise($qrec['#']['text'][0]['#']);
$question->questiontext = $this->cleaninput($htmltext);
$question->questiontextformat = FORMAT_HTML;
$question->questiontextfiles = array();
$question->name = $this->create_default_question_name($question->questiontext, get_string('questionname', 'question'));
switch ($question->qtype) {
case 'multichoice':
$question = $this->parse_mc($qrec['#'], $question);
break;
case 'match':
$groupname = trim($qrec['@']['group']);
$question = $this->parse_ma($qrec['#'], $groupname);
break;
case 'truefalse':
$question = $this->parse_tf_yn($qrec['#'], $question);
break;
case 'shortanswer':
$question = $this->parse_co($qrec['#'], $question);
break;
case 'essay':
$question = $this->parse_es($qrec['#'], $question);
break;
case 'numerical':
$question = $this->parse_nr($qrec['#'], $question);
break;
break;
default:
echo $OUTPUT->notification(get_string('unknownorunhandledtype', 'question', $type));
$question = null;
}
return $question;
}
protected function parse_tf_yn($qrec, $question) {
$choices = array('T' => 1, 'Y' => 1, 'F' => 0, 'N' => 0 );
$answer = trim($qrec['answer'][0]['#']);
$question->answer = $choices[$answer];
$question->correctanswer = $question->answer;
if ($question->answer == 1) {
$question->feedbacktrue = $this->text_field(get_string('correct', 'question'));
$question->feedbackfalse = $this->text_field(get_string('incorrect', 'question'));
} else {
$question->feedbacktrue = $this->text_field(get_string('incorrect', 'question'));
$question->feedbackfalse = $this->text_field(get_string('correct', 'question'));
}
return $question;
}
protected function parse_mc($qrec, $question) {
$question = $this->add_blank_combined_feedback($question);
$answer = 'choice-'.strtolower(trim($qrec['answer'][0]['#']));
$choices = $qrec['choices'][0]['#'];
foreach ($choices as $key => $value) {
if (strpos(trim($key), 'choice-') !== false) {
$question->answer[] = $this->text_field(s($this->unxmlise($value[0]['#'])));
if (strcmp($key, $answer) == 0) {
$question->fraction[] = 1;
$question->feedback[] = $this->text_field(get_string('correct', 'question'));
} else {
$question->fraction[] = 0;
$question->feedback[] = $this->text_field(get_string('incorrect', 'question'));
}
}
}
return $question;
}
protected function parse_co($qrec, $question) {
$question->usecase = 0;
$answer = trim($this->unxmlise($qrec['answer'][0]['#']));
$answer = strip_tags( $answer );
$answers = explode("\n", $answer);
foreach ($answers as $key => $value) {
$value = trim($value);
if (strlen($value) > 0) {
$question->answer[] = $value;
$question->fraction[] = 1;
$question->feedback[] = $this->text_field(get_string('correct', 'question'));
}
}
$question->answer[] = '*';
$question->fraction[] = 0;
$question->feedback[] = $this->text_field(get_string('incorrect', 'question'));
return $question;
}
protected function parse_es($qrec, $question) {
$feedback = trim($this->unxmlise($qrec['answer'][0]['#']));
$question->graderinfo = $this->text_field($feedback);
$question->responsetemplate = $this->text_field('');
$question->responserequired = 1;
$question->feedback = $feedback;
$question->responseformat = 'editor';
$question->responsefieldlines = 15;
$question->attachments = 0;
$question->attachmentsrequired = 0;
$question->fraction = 0;
return $question;
}
protected function parse_nr($qrec, $question) {
$answer = trim($this->unxmlise($qrec['answer'][0]['#']));
$answer = strip_tags( $answer );
$answers = explode("\n", $answer);
foreach ($answers as $key => $value) {
$value = trim($value);
if (is_numeric($value)) {
$errormargin = 0;
$question->answer[] = $value;
$question->fraction[] = 1;
$question->feedback[] = $this->text_field(get_string('correct', 'question'));
$question->tolerance[] = $errormargin;
}
}
return $question;
}
}
// End class.