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questiontype.php
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questiontype.php
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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/>.
/**
* Question type class for the drag&drop matching question type.
*
* @package qtype_ddmatch
* @copyright 2007 Adriane Boyd ([email protected])
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir . '/questionlib.php');
require_once($CFG->dirroot . '/question/engine/lib.php');
/**
* The drag&drop matching question type class.
*
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qtype_ddmatch extends question_type {
public function get_question_options($question) {
global $DB;
parent::get_question_options($question);
$question->options = $DB->get_record('qtype_ddmatch_options',
array('questionid' => $question->id));
$question->options->subquestions = $DB->get_records('qtype_ddmatch_subquestions',
array('questionid' => $question->id), 'id ASC');
return true;
}
public function save_question_options($question) {
global $DB;
$context = $question->context;
$result = new stdClass();
$oldsubquestions = $DB->get_records('qtype_ddmatch_subquestions',
array('questionid' => $question->id), 'id ASC');
// Insert all the new question & answer pairs.
foreach ($question->subquestions as $key => $questiontext) {
if ($questiontext['text'] == '' && trim($question->subanswers[$key]['text']) == '') {
continue;
}
if ($questiontext['text'] != '' && trim($question->subanswers[$key]['text']) == '') {
$result->notice = get_string('nomatchinganswer', 'qtype_match', $questiontext['text']);
}
// Update an existing subquestion if possible.
$subquestion = array_shift($oldsubquestions);
if (!$subquestion) {
$subquestion = new stdClass();
$subquestion->questionid = $question->id;
$subquestion->questiontext = '';
$subquestion->answertext = '';
$subquestion->id = $DB->insert_record('qtype_ddmatch_subquestions', $subquestion);
}
$subquestion->questiontext = $this->import_or_save_files($questiontext,
$context, 'qtype_ddmatch', 'subquestion', $subquestion->id);
$subquestion->questiontextformat = $questiontext['format'];
$subquestion->answertext = $this->import_or_save_files($question->subanswers[$key],
$context, 'qtype_ddmatch', 'subanswer', $subquestion->id);
$subquestion->answertextformat = $question->subanswers[$key]['format'];
$DB->update_record('qtype_ddmatch_subquestions', $subquestion);
}
// Delete old subquestions records.
$fs = get_file_storage();
foreach ($oldsubquestions as $oldsub) {
$fs->delete_area_files($context->id, 'qtype_ddmatch', 'subquestion', $oldsub->id);
$fs->delete_area_files($context->id, 'qtype_ddmatch', 'subanswer', $oldsub->id);
$DB->delete_records('qtype_ddmatch_subquestions', array('id' => $oldsub->id));
}
// Save the question options.
$options = $DB->get_record('qtype_ddmatch_options', array('questionid' => $question->id));
if (!$options) {
$options = new stdClass();
$options->questionid = $question->id;
$options->correctfeedback = '';
$options->partiallycorrectfeedback = '';
$options->incorrectfeedback = '';
$options->id = $DB->insert_record('qtype_ddmatch_options', $options);
}
$options->shuffleanswers = $question->shuffleanswers;
$options = $this->save_combined_feedback_helper($options, $question, $context, true);
$DB->update_record('qtype_ddmatch_options', $options);
$this->save_hints($question, true);
if (!empty($result->notice)) {
return $result;
}
return true;
}
protected function initialise_question_instance(question_definition $question, $questiondata) {
parent::initialise_question_instance($question, $questiondata);
$question->shufflestems = $questiondata->options->shuffleanswers;
$this->initialise_combined_feedback($question, $questiondata, true);
$question->stems = array();
$question->choices = array();
$question->right = array();
foreach ($questiondata->options->subquestions as $matchsub) {
$ans = $matchsub->answertext;
$key = array_search($matchsub->answertext, $question->choices);
if ($key === false) {
$key = $matchsub->id;
$question->choices[$key] = $matchsub->answertext;
$question->choiceformat[$key] = $matchsub->answertextformat;
}
if ($matchsub->questiontext !== '') {
$question->stems[$matchsub->id] = $matchsub->questiontext;
$question->stemformat[$matchsub->id] = $matchsub->questiontextformat;
$question->right[$matchsub->id] = $key;
}
}
}
protected function make_hint($hint) {
return question_hint_with_parts::load_from_record($hint);
}
public function delete_question($questionid, $contextid) {
global $DB;
$DB->delete_records('qtype_ddmatch_options', array('questionid' => $questionid));
$DB->delete_records('qtype_ddmatch_subquestions', array('questionid' => $questionid));
parent::delete_question($questionid, $contextid);
}
public function get_random_guess_score($questiondata) {
$q = $this->make_question($questiondata);
return 1 / count($q->choices);
}
public function get_possible_responses($questiondata) {
$subqs = array();
$q = $this->make_question($questiondata);
foreach ($q->stems as $stemid => $stem) {
$responses = array();
foreach ($q->choices as $choiceid => $choice) {
$stemhtml = $q->html_to_text($stem, $q->stemformat[$stemid]);
$choicehtml = $q->html_to_text($choice, $q->choiceformat[$choiceid]);
$responses[$choiceid] = new question_possible_response(
$stemhtml. ': ' . $choicehtml,
($choiceid == $q->right[$stemid]) / count($q->stems));
}
$responses[null] = question_possible_response::no_response();
$subqs[$stemid] = $responses;
}
return $subqs;
}
public function move_files($questionid, $oldcontextid, $newcontextid) {
global $DB;
$fs = get_file_storage();
parent::move_files($questionid, $oldcontextid, $newcontextid);
$subquestionids = $DB->get_records_menu('qtype_ddmatch_subquestions',
array('questionid' => $questionid), 'id', 'id,1');
foreach ($subquestionids as $subquestionid => $notused) {
$fs->move_area_files_to_new_context($oldcontextid,
$newcontextid, 'qtype_ddmatch', 'subquestion', $subquestionid);
$fs->move_area_files_to_new_context($oldcontextid,
$newcontextid, 'qtype_ddmatch', 'subanswer', $subquestionid);
}
$this->move_files_in_combined_feedback($questionid, $oldcontextid, $newcontextid);
$this->move_files_in_hints($questionid, $oldcontextid, $newcontextid);
}
protected function delete_files($questionid, $contextid) {
global $DB;
$fs = get_file_storage();
parent::delete_files($questionid, $contextid);
$subquestionids = $DB->get_records_menu('qtype_ddmatch_subquestions',
array('questionid' => $questionid), 'id', 'id,1');
foreach ($subquestionids as $subquestionid => $notused) {
$fs->delete_area_files($contextid, 'qtype_ddmatch', 'subquestion', $subquestionid);
$fs->delete_area_files($contextid, 'qtype_ddmatch', 'subanswer', $subquestionid);
}
$this->delete_files_in_combined_feedback($questionid, $contextid);
$this->delete_files_in_hints($questionid, $contextid);
}
/**
* Provide export functionality for xml format
* @param question object the question object
* @param format object the format object so that helper methods can be used
* @param extra mixed any additional format specific data that may be passed by the format (see format code for info)
* @return string the data to append to the output buffer or false if error
*/
public function export_to_xml($question, qformat_xml $format, $extra=null) {
$expout = '';
$fs = get_file_storage();
$contextid = $question->contextid;
$expout .= " <shuffleanswers>" .
$format->get_single($question->options->shuffleanswers) .
"</shuffleanswers>\n";
$expout .= $format->write_combined_feedback($question->options,
$question->id,
$question->contextid);
foreach ($question->options->subquestions as $subquestion) {
$files = $fs->get_area_files($contextid, 'qtype_ddmatch', 'subquestion', $subquestion->id);
$textformat = $format->get_format($subquestion->questiontextformat);
$expout .= " <subquestion format=\"$textformat\">\n";
$expout .= ' ' . $format->writetext( $subquestion->questiontext );
$expout .= ' ' . $format->write_files($files, 2);
$expout .= " <answer format=\"$textformat\">\n";
$expout .= ' ' . $format->writetext( $subquestion->answertext );
$files = $fs->get_area_files($contextid, 'qtype_ddmatch', 'subanswer', $subquestion->id);
$expout .= ' ' . $format->write_files($files, 2);
$expout .= " </answer>\n";
$expout .= " </subquestion>\n";
}
return $expout;
}
/**
* Provide import functionality for xml format
* @param $xml mixed the segment of data containing the question
* @param $fromform object question object processed (so far) by standard import code
* @param $format object the format object so that helper methods can be used (in particular error() )
* @param $extra mixed any additional format specific data that may be passed by the format (see format code for info)
* @return object question object suitable for save_options() call or false if cannot handle
*/
public function import_from_xml($xml, $fromform, qformat_xml $format, $extra=null) {
// Check question is for us.
$qtype = $xml['@']['type'];
if ($qtype == 'ddmatch') {
$fromform = $format->import_headers($xml);
// Header parts particular to ddmatch qtype.
$fromform->qtype = $this->name();
$fromform->shuffleanswers = $format->trans_single($format->getpath($xml,
array('#', 'shuffleanswers', 0, '#'), 1));
// Run through subquestions.
$fromform->subquestions = array();
$fromform->subanswers = array();
foreach ($xml['#']['subquestion'] as $subqxml) {
$fromform->subquestions[] = $format->import_text_with_files($subqxml,
array(), '', $format->get_format($fromform->questiontextformat));
$answers = $format->getpath($subqxml, array('#', 'answer', 0), array());
$fromform->subanswers[] = $format->import_text_with_files($answers,
array(), '', $format->get_format($fromform->questiontextformat));
}
$format->import_combined_feedback($fromform, $xml, true);
$format->import_hints($fromform, $xml, true);
return $fromform;
} else {
return false;
}
}
}