mirrored from git://git.moodle.org/moodle.git
/
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 calculated question type.
*
* @package qtype
* @subpackage calculated
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot . '/question/type/questiontypebase.php');
require_once($CFG->dirroot . '/question/type/questionbase.php');
require_once($CFG->dirroot . '/question/type/numerical/question.php');
/**
* The calculated question type.
*
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qtype_calculated extends question_type {
/**
* @const string a placeholder is a letter, followed by almost any characters. (This should probably be restricted more.)
*/
const PLACEHOLDER_REGEX_PART = '[[:alpha:]][^>} <`{"\']*';
/**
* @const string REGEXP for a placeholder, wrapped in its {...} delimiters, with capturing brackets around the name.
*/
const PLACEHODLER_REGEX = '~\{(' . self::PLACEHOLDER_REGEX_PART . ')\}~';
/**
* @const string Regular expression that finds the formulas in content, with capturing brackets to get the forumlas.
*/
const FORMULAS_IN_TEXT_REGEX = '~\{=([^{}]*(?:\{' . self::PLACEHOLDER_REGEX_PART . '\}[^{}]*)*)\}~';
const MAX_DATASET_ITEMS = 100;
public $wizardpagesnumber = 3;
public function get_question_options($question) {
// First get the datasets and default options.
// The code is used for calculated, calculatedsimple and calculatedmulti qtypes.
global $CFG, $DB, $OUTPUT;
if (!$question->options = $DB->get_record('question_calculated_options',
array('question' => $question->id))) {
$question->options = new stdClass();
$question->options->synchronize = 0;
$question->options->single = 0;
$question->options->answernumbering = 'abc';
$question->options->shuffleanswers = 0;
$question->options->correctfeedback = '';
$question->options->partiallycorrectfeedback = '';
$question->options->incorrectfeedback = '';
$question->options->correctfeedbackformat = 0;
$question->options->partiallycorrectfeedbackformat = 0;
$question->options->incorrectfeedbackformat = 0;
}
if (!$question->options->answers = $DB->get_records_sql("
SELECT a.*, c.tolerance, c.tolerancetype, c.correctanswerlength, c.correctanswerformat
FROM {question_answers} a,
{question_calculated} c
WHERE a.question = ?
AND a.id = c.answer
ORDER BY a.id ASC", array($question->id))) {
return false;
}
if ($this->get_virtual_qtype()->name() == 'numerical') {
$this->get_virtual_qtype()->get_numerical_units($question);
$this->get_virtual_qtype()->get_numerical_options($question);
}
$question->hints = $DB->get_records('question_hints',
array('questionid' => $question->id), 'id ASC');
if (isset($question->export_process)&&$question->export_process) {
$question->options->datasets = $this->get_datasets_for_export($question);
}
return true;
}
public function get_datasets_for_export($question) {
global $DB, $CFG;
$datasetdefs = array();
if (!empty($question->id)) {
$sql = "SELECT i.*
FROM {question_datasets} d, {question_dataset_definitions} i
WHERE d.question = ? AND d.datasetdefinition = i.id";
if ($records = $DB->get_records_sql($sql, array($question->id))) {
foreach ($records as $r) {
$def = $r;
if ($def->category == '0') {
$def->status = 'private';
} else {
$def->status = 'shared';
}
$def->type = 'calculated';
list($distribution, $min, $max, $dec) = explode(':', $def->options, 4);
$def->distribution = $distribution;
$def->minimum = $min;
$def->maximum = $max;
$def->decimals = $dec;
if ($def->itemcount > 0) {
// Get the datasetitems.
$def->items = array();
if ($items = $this->get_database_dataset_items($def->id)) {
$n = 0;
foreach ($items as $ii) {
$n++;
$def->items[$n] = new stdClass();
$def->items[$n]->itemnumber = $ii->itemnumber;
$def->items[$n]->value = $ii->value;
}
$def->number_of_items = $n;
}
}
$datasetdefs["1-{$r->category}-{$r->name}"] = $def;
}
}
}
return $datasetdefs;
}
public function save_question_options($question) {
global $CFG, $DB;
// Make it impossible to save bad formulas anywhere.
$this->validate_question_data($question);
// The code is used for calculated, calculatedsimple and calculatedmulti qtypes.
$context = $question->context;
// Calculated options.
$update = true;
$options = $DB->get_record('question_calculated_options',
array('question' => $question->id));
if (!$options) {
$update = false;
$options = new stdClass();
$options->question = $question->id;
}
// As used only by calculated.
if (isset($question->synchronize)) {
$options->synchronize = $question->synchronize;
} else {
$options->synchronize = 0;
}
$options->single = 0;
$options->answernumbering = $question->answernumbering;
$options->shuffleanswers = $question->shuffleanswers;
foreach (array('correctfeedback', 'partiallycorrectfeedback',
'incorrectfeedback') as $feedbackname) {
$options->$feedbackname = '';
$feedbackformat = $feedbackname . 'format';
$options->$feedbackformat = 0;
}
if ($update) {
$DB->update_record('question_calculated_options', $options);
} else {
$DB->insert_record('question_calculated_options', $options);
}
// Get old versions of the objects.
$oldanswers = $DB->get_records('question_answers',
array('question' => $question->id), 'id ASC');
$oldoptions = $DB->get_records('question_calculated',
array('question' => $question->id), 'answer ASC');
// Save the units.
$virtualqtype = $this->get_virtual_qtype();
$result = $virtualqtype->save_units($question);
if (isset($result->error)) {
return $result;
} else {
$units = $result->units;
}
foreach ($question->answer as $key => $answerdata) {
if (trim($answerdata) == '') {
continue;
}
// Update an existing answer if possible.
$answer = array_shift($oldanswers);
if (!$answer) {
$answer = new stdClass();
$answer->question = $question->id;
$answer->answer = '';
$answer->feedback = '';
$answer->id = $DB->insert_record('question_answers', $answer);
}
$answer->answer = trim($answerdata);
$answer->fraction = $question->fraction[$key];
$answer->feedback = $this->import_or_save_files($question->feedback[$key],
$context, 'question', 'answerfeedback', $answer->id);
$answer->feedbackformat = $question->feedback[$key]['format'];
$DB->update_record("question_answers", $answer);
// Set up the options object.
if (!$options = array_shift($oldoptions)) {
$options = new stdClass();
}
$options->question = $question->id;
$options->answer = $answer->id;
$options->tolerance = trim($question->tolerance[$key]);
$options->tolerancetype = trim($question->tolerancetype[$key]);
$options->correctanswerlength = trim($question->correctanswerlength[$key]);
$options->correctanswerformat = trim($question->correctanswerformat[$key]);
// Save options.
if (isset($options->id)) {
// Reusing existing record.
$DB->update_record('question_calculated', $options);
} else {
// New options.
$DB->insert_record('question_calculated', $options);
}
}
// Delete old answer records.
if (!empty($oldanswers)) {
foreach ($oldanswers as $oa) {
$DB->delete_records('question_answers', array('id' => $oa->id));
}
}
// Delete old answer records.
if (!empty($oldoptions)) {
foreach ($oldoptions as $oo) {
$DB->delete_records('question_calculated', array('id' => $oo->id));
}
}
$result = $virtualqtype->save_unit_options($question);
if (isset($result->error)) {
return $result;
}
$this->save_hints($question);
if (isset($question->import_process)&&$question->import_process) {
$this->import_datasets($question);
}
// Report any problems.
if (!empty($result->notice)) {
return $result;
}
return true;
}
public function import_datasets($question) {
global $DB;
$n = count($question->dataset);
foreach ($question->dataset as $dataset) {
// Name, type, option.
$datasetdef = new stdClass();
$datasetdef->name = $dataset->name;
$datasetdef->type = 1;
$datasetdef->options = $dataset->distribution . ':' . $dataset->min . ':' .
$dataset->max . ':' . $dataset->length;
$datasetdef->itemcount = $dataset->itemcount;
if ($dataset->status == 'private') {
$datasetdef->category = 0;
$todo = 'create';
} else if ($dataset->status == 'shared') {
if ($sharedatasetdefs = $DB->get_records_select(
'question_dataset_definitions',
"type = '1'
AND " . $DB->sql_like('name', '?') . "
AND category = ?
ORDER BY id DESC ", array($DB->sql_like_escape($dataset->name), $question->category)
)) { // So there is at least one.
$sharedatasetdef = array_shift($sharedatasetdefs);
if ($sharedatasetdef->options == $datasetdef->options) {// Identical so use it.
$todo = 'useit';
$datasetdef = $sharedatasetdef;
} else { // Different so create a private one.
$datasetdef->category = 0;
$todo = 'create';
}
} else { // No so create one.
$datasetdef->category = $question->category;
$todo = 'create';
}
}
if ($todo == 'create') {
$datasetdef->id = $DB->insert_record('question_dataset_definitions', $datasetdef);
}
// Create relation to the dataset.
$questiondataset = new stdClass();
$questiondataset->question = $question->id;
$questiondataset->datasetdefinition = $datasetdef->id;
$DB->insert_record('question_datasets', $questiondataset);
if ($todo == 'create') {
// Add the items.
foreach ($dataset->datasetitem as $dataitem) {
$datasetitem = new stdClass();
$datasetitem->definition = $datasetdef->id;
$datasetitem->itemnumber = $dataitem->itemnumber;
$datasetitem->value = $dataitem->value;
$DB->insert_record('question_dataset_items', $datasetitem);
}
}
}
}
protected function initialise_question_instance(question_definition $question, $questiondata) {
parent::initialise_question_instance($question, $questiondata);
question_bank::get_qtype('numerical')->initialise_numerical_answers(
$question, $questiondata);
foreach ($questiondata->options->answers as $a) {
$question->answers[$a->id]->tolerancetype = $a->tolerancetype;
$question->answers[$a->id]->correctanswerlength = $a->correctanswerlength;
$question->answers[$a->id]->correctanswerformat = $a->correctanswerformat;
}
$question->synchronised = $questiondata->options->synchronize;
$question->unitdisplay = $questiondata->options->showunits;
$question->unitgradingtype = $questiondata->options->unitgradingtype;
$question->unitpenalty = $questiondata->options->unitpenalty;
$question->ap = question_bank::get_qtype(
'numerical')->make_answer_processor(
$questiondata->options->units, $questiondata->options->unitsleft);
$question->datasetloader = new qtype_calculated_dataset_loader($questiondata->id);
}
public function finished_edit_wizard($form) {
return isset($form->savechanges);
}
public function wizardpagesnumber() {
return 3;
}
// This gets called by editquestion.php after the standard question is saved.
public function print_next_wizard_page($question, $form, $course) {
global $CFG, $SESSION, $COURSE;
// Catch invalid navigation & reloads.
if (empty($question->id) && empty($SESSION->calculated)) {
redirect('edit.php?courseid='.$COURSE->id, 'The page you are loading has expired.', 3);
}
// See where we're coming from.
switch($form->wizardpage) {
case 'question':
require("{$CFG->dirroot}/question/type/calculated/datasetdefinitions.php");
break;
case 'datasetdefinitions':
case 'datasetitems':
require("{$CFG->dirroot}/question/type/calculated/datasetitems.php");
break;
default:
print_error('invalidwizardpage', 'question');
break;
}
}
// This gets called by question2.php after the standard question is saved.
public function &next_wizard_form($submiturl, $question, $wizardnow) {
global $CFG, $SESSION, $COURSE;
// Catch invalid navigation & reloads.
if (empty($question->id) && empty($SESSION->calculated)) {
redirect('edit.php?courseid=' . $COURSE->id,
'The page you are loading has expired. Cannot get next wizard form.', 3);
}
if (empty($question->id)) {
$question = $SESSION->calculated->questionform;
}
// See where we're coming from.
switch($wizardnow) {
case 'datasetdefinitions':
require("{$CFG->dirroot}/question/type/calculated/datasetdefinitions_form.php");
$mform = new question_dataset_dependent_definitions_form(
"{$submiturl}?wizardnow=datasetdefinitions", $question);
break;
case 'datasetitems':
require("{$CFG->dirroot}/question/type/calculated/datasetitems_form.php");
$regenerate = optional_param('forceregeneration', false, PARAM_BOOL);
$mform = new question_dataset_dependent_items_form(
"{$submiturl}?wizardnow=datasetitems", $question, $regenerate);
break;
default:
print_error('invalidwizardpage', 'question');
break;
}
return $mform;
}
/**
* This method should be overriden if you want to include a special heading or some other
* html on a question editing page besides the question editing form.
*
* @param question_edit_form $mform a child of question_edit_form
* @param object $question
* @param string $wizardnow is '' for first page.
*/
public function display_question_editing_page($mform, $question, $wizardnow) {
global $OUTPUT;
switch ($wizardnow) {
case '':
// On the first page, the default display is fine.
parent::display_question_editing_page($mform, $question, $wizardnow);
return;
case 'datasetdefinitions':
echo $OUTPUT->heading_with_help(
get_string('choosedatasetproperties', 'qtype_calculated'),
'questiondatasets', 'qtype_calculated');
break;
case 'datasetitems':
echo $OUTPUT->heading_with_help(get_string('editdatasets', 'qtype_calculated'),
'questiondatasets', 'qtype_calculated');
break;
}
$mform->display();
}
/**
* Verify that the equations in part of the question are OK.
* We throw an exception here because this should have already been validated
* by the form. This is just a last line of defence to prevent a question
* being stored in the database if it has bad formulas. This saves us from,
* for example, malicious imports.
* @param string $text containing equations.
*/
protected function validate_text($text) {
$error = qtype_calculated_find_formula_errors_in_text($text);
if ($error) {
throw new coding_exception($error);
}
}
/**
* Verify that an answer is OK.
* We throw an exception here because this should have already been validated
* by the form. This is just a last line of defence to prevent a question
* being stored in the database if it has bad formulas. This saves us from,
* for example, malicious imports.
* @param string $text containing equations.
*/
protected function validate_answer($answer) {
$error = qtype_calculated_find_formula_errors($answer);
if ($error) {
throw new coding_exception($error);
}
}
/**
* Validate data before save.
* @param stdClass $question data from the form / import file.
*/
protected function validate_question_data($question) {
$this->validate_text($question->questiontext); // Yes, really no ['text'].
if (isset($question->generalfeedback['text'])) {
$this->validate_text($question->generalfeedback['text']);
} else if (isset($question->generalfeedback)) {
$this->validate_text($question->generalfeedback); // Because question import is weird.
}
foreach ($question->answer as $key => $answer) {
$this->validate_answer($answer);
$this->validate_text($question->feedback[$key]['text']);
}
}
/**
* Remove prefix #{..}# if exists.
* @param $name a question name,
* @return string the cleaned up question name.
*/
public function clean_technical_prefix_from_question_name($name) {
return preg_replace('~#\{([^[:space:]]*)#~', '', $name);
}
/**
* This method prepare the $datasets in a format similar to dadatesetdefinitions_form.php
* so that they can be saved
* using the function save_dataset_definitions($form)
* when creating a new calculated question or
* when editing an already existing calculated question
* or by function save_as_new_dataset_definitions($form, $initialid)
* when saving as new an already existing calculated question.
*
* @param object $form
* @param int $questionfromid default = '0'
*/
public function preparedatasets($form, $questionfromid = '0') {
// The dataset names present in the edit_question_form and edit_calculated_form
// are retrieved.
$possibledatasets = $this->find_dataset_names($form->questiontext);
$mandatorydatasets = array();
foreach ($form->answer as $key => $answer) {
$mandatorydatasets += $this->find_dataset_names($answer);
}
// If there are identical datasetdefs already saved in the original question
// either when editing a question or saving as new,
// they are retrieved using $questionfromid.
if ($questionfromid != '0') {
$form->id = $questionfromid;
}
$datasets = array();
$key = 0;
// Always prepare the mandatorydatasets present in the answers.
// The $options are not used here.
foreach ($mandatorydatasets as $datasetname) {
if (!isset($datasets[$datasetname])) {
list($options, $selected) =
$this->dataset_options($form, $datasetname);
$datasets[$datasetname] = '';
$form->dataset[$key] = $selected;
$key++;
}
}
// Do not prepare possibledatasets when creating a question.
// They will defined and stored with datasetdefinitions_form.php.
// The $options are not used here.
if ($questionfromid != '0') {
foreach ($possibledatasets as $datasetname) {
if (!isset($datasets[$datasetname])) {
list($options, $selected) =
$this->dataset_options($form, $datasetname, false);
$datasets[$datasetname] = '';
$form->dataset[$key] = $selected;
$key++;
}
}
}
return $datasets;
}
public function addnamecategory(&$question) {
global $DB;
$categorydatasetdefs = $DB->get_records_sql(
"SELECT a.*
FROM {question_datasets} b, {question_dataset_definitions} a
WHERE a.id = b.datasetdefinition
AND a.type = '1'
AND a.category != 0
AND b.question = ?
ORDER BY a.name ", array($question->id));
$questionname = $this->clean_technical_prefix_from_question_name($question->name);
if (!empty($categorydatasetdefs)) {
// There is at least one with the same name.
$questionname = '#' . $questionname;
foreach ($categorydatasetdefs as $def) {
if (strlen($def->name) + strlen($questionname) < 250) {
$questionname = '{' . $def->name . '}' . $questionname;
}
}
$questionname = '#' . $questionname;
}
$DB->set_field('question', 'name', $questionname, array('id' => $question->id));
}
/**
* this version save the available data at the different steps of the question editing process
* without using global $SESSION as storage between steps
* at the first step $wizardnow = 'question'
* when creating a new question
* when modifying a question
* when copying as a new question
* the general parameters and answers are saved using parent::save_question
* then the datasets are prepared and saved
* at the second step $wizardnow = 'datasetdefinitions'
* the datadefs final type are defined as private, category or not a datadef
* at the third step $wizardnow = 'datasetitems'
* the datadefs parameters and the data items are created or defined
*
* @param object question
* @param object $form
* @param int $course
* @param PARAM_ALPHA $wizardnow should be added as we are coming from question2.php
*/
public function save_question($question, $form) {
global $DB;
if ($this->wizardpagesnumber() == 1 || $question->qtype == 'calculatedsimple') {
$question = parent::save_question($question, $form);
return $question;
}
$wizardnow = optional_param('wizardnow', '', PARAM_ALPHA);
$id = optional_param('id', 0, PARAM_INT); // Question id.
// In case 'question':
// For a new question $form->id is empty
// when saving as new question.
// The $question->id = 0, $form is $data from question2.php
// and $data->makecopy is defined as $data->id is the initial question id.
// Edit case. If it is a new question we don't necessarily need to
// return a valid question object.
// See where we're coming from.
switch($wizardnow) {
case '' :
case 'question': // Coming from the first page, creating the second.
if (empty($form->id)) { // or a new question $form->id is empty.
$question = parent::save_question($question, $form);
// Prepare the datasets using default $questionfromid.
$this->preparedatasets($form);
$form->id = $question->id;
$this->save_dataset_definitions($form);
if (isset($form->synchronize) && $form->synchronize == 2) {
$this->addnamecategory($question);
}
} else if (!empty($form->makecopy)) {
$questionfromid = $form->id;
$question = parent::save_question($question, $form);
// Prepare the datasets.
$this->preparedatasets($form, $questionfromid);
$form->id = $question->id;
$this->save_as_new_dataset_definitions($form, $questionfromid);
if (isset($form->synchronize) && $form->synchronize == 2) {
$this->addnamecategory($question);
}
} else {
// Editing a question.
$question = parent::save_question($question, $form);
// Prepare the datasets.
$this->preparedatasets($form, $question->id);
$form->id = $question->id;
$this->save_dataset_definitions($form);
if (isset($form->synchronize) && $form->synchronize == 2) {
$this->addnamecategory($question);
}
}
break;
case 'datasetdefinitions':
// Calculated options.
// It cannot go here without having done the first page,
// so the question_calculated_options should exist.
// We only need to update the synchronize field.
if (isset($form->synchronize)) {
$optionssynchronize = $form->synchronize;
} else {
$optionssynchronize = 0;
}
$DB->set_field('question_calculated_options', 'synchronize', $optionssynchronize,
array('question' => $question->id));
if (isset($form->synchronize) && $form->synchronize == 2) {
$this->addnamecategory($question);
}
$this->save_dataset_definitions($form);
break;
case 'datasetitems':
$this->save_dataset_items($question, $form);
$this->save_question_calculated($question, $form);
break;
default:
print_error('invalidwizardpage', 'question');
break;
}
return $question;
}
public function delete_question($questionid, $contextid) {
global $DB;
$DB->delete_records('question_calculated', array('question' => $questionid));
$DB->delete_records('question_calculated_options', array('question' => $questionid));
$DB->delete_records('question_numerical_units', array('question' => $questionid));
if ($datasets = $DB->get_records('question_datasets', array('question' => $questionid))) {
foreach ($datasets as $dataset) {
if (!$DB->get_records_select('question_datasets',
"question != ? AND datasetdefinition = ? ",
array($questionid, $dataset->datasetdefinition))) {
$DB->delete_records('question_dataset_definitions',
array('id' => $dataset->datasetdefinition));
$DB->delete_records('question_dataset_items',
array('definition' => $dataset->datasetdefinition));
}
}
}
$DB->delete_records('question_datasets', array('question' => $questionid));
parent::delete_question($questionid, $contextid);
}
public function get_random_guess_score($questiondata) {
foreach ($questiondata->options->answers as $aid => $answer) {
if ('*' == trim($answer->answer)) {
return max($answer->fraction - $questiondata->options->unitpenalty, 0);
}
}
return 0;
}
public function supports_dataset_item_generation() {
// Calculated support generation of randomly distributed number data.
return true;
}
public function custom_generator_tools_part($mform, $idx, $j) {
$minmaxgrp = array();
$minmaxgrp[] = $mform->createElement('text', "calcmin[{$idx}]",
get_string('calcmin', 'qtype_calculated'));
$minmaxgrp[] = $mform->createElement('text', "calcmax[{$idx}]",
get_string('calcmax', 'qtype_calculated'));
$mform->addGroup($minmaxgrp, 'minmaxgrp',
get_string('minmax', 'qtype_calculated'), ' - ', false);
$mform->setType("calcmin[{$idx}]", PARAM_FLOAT);
$mform->setType("calcmax[{$idx}]", PARAM_FLOAT);
$precisionoptions = range(0, 10);
$mform->addElement('select', "calclength[{$idx}]",
get_string('calclength', 'qtype_calculated'), $precisionoptions);
$distriboptions = array('uniform' => get_string('uniform', 'qtype_calculated'),
'loguniform' => get_string('loguniform', 'qtype_calculated'));
$mform->addElement('select', "calcdistribution[{$idx}]",
get_string('calcdistribution', 'qtype_calculated'), $distriboptions);
}
public function custom_generator_set_data($datasetdefs, $formdata) {
$idx = 1;
foreach ($datasetdefs as $datasetdef) {
if (preg_match('~^(uniform|loguniform):([^:]*):([^:]*):([0-9]*)$~',
$datasetdef->options, $regs)) {
$defid = "{$datasetdef->type}-{$datasetdef->category}-{$datasetdef->name}";
$formdata["calcdistribution[{$idx}]"] = $regs[1];
$formdata["calcmin[{$idx}]"] = $regs[2];
$formdata["calcmax[{$idx}]"] = $regs[3];
$formdata["calclength[{$idx}]"] = $regs[4];
}
$idx++;
}
return $formdata;
}
public function custom_generator_tools($datasetdef) {
global $OUTPUT;
if (preg_match('~^(uniform|loguniform):([^:]*):([^:]*):([0-9]*)$~',
$datasetdef->options, $regs)) {
$defid = "{$datasetdef->type}-{$datasetdef->category}-{$datasetdef->name}";
for ($i = 0; $i<10; ++$i) {
$lengthoptions[$i] = get_string(($regs[1] == 'uniform'
? 'decimals'
: 'significantfigures'), 'qtype_calculated', $i);
}
$menu1 = html_writer::label(get_string('lengthoption', 'qtype_calculated'),
'menucalclength', false, array('class' => 'accesshide'));
$menu1 .= html_writer::select($lengthoptions, 'calclength[]', $regs[4], null);
$options = array('uniform' => get_string('uniformbit', 'qtype_calculated'),
'loguniform' => get_string('loguniformbit', 'qtype_calculated'));
$menu2 = html_writer::label(get_string('distributionoption', 'qtype_calculated'),
'menucalcdistribution', false, array('class' => 'accesshide'));
$menu2 .= html_writer::select($options, 'calcdistribution[]', $regs[1], null);
return '<input type="submit" onclick="'
. "getElementById('addform').regenerateddefid.value='{$defid}'; return true;"
.'" value="'. get_string('generatevalue', 'qtype_calculated') . '"/><br/>'
. '<input type="text" size="3" name="calcmin[]" '
. " value=\"{$regs[2]}\"/> & <input name=\"calcmax[]\" "
. ' type="text" size="3" value="' . $regs[3] .'"/> '
. $menu1 . '<br/>'
. $menu2;
} else {
return '';
}
}
public function update_dataset_options($datasetdefs, $form) {
global $OUTPUT;
// Do we have information about new options ?
if (empty($form->definition) || empty($form->calcmin)
||empty($form->calcmax) || empty($form->calclength)
|| empty($form->calcdistribution)) {
// I guess not.
} else {
// Looks like we just could have some new information here.
$uniquedefs = array_values(array_unique($form->definition));
foreach ($uniquedefs as $key => $defid) {
if (isset($datasetdefs[$defid])
&& is_numeric($form->calcmin[$key+1])
&& is_numeric($form->calcmax[$key+1])
&& is_numeric($form->calclength[$key+1])) {
switch ($form->calcdistribution[$key+1]) {
case 'uniform': case 'loguniform':
$datasetdefs[$defid]->options =
$form->calcdistribution[$key+1] . ':'
. $form->calcmin[$key+1] . ':'
. $form->calcmax[$key+1] . ':'
. $form->calclength[$key+1];
break;
default:
echo $OUTPUT->notification(
"Unexpected distribution ".$form->calcdistribution[$key+1]);
}
}
}
}
// Look for empty options, on which we set default values.
foreach ($datasetdefs as $defid => $def) {
if (empty($def->options)) {
$datasetdefs[$defid]->options = 'uniform:1.0:10.0:1';
}
}
return $datasetdefs;
}
public function save_question_calculated($question, $fromform) {
global $DB;
foreach ($question->options->answers as $key => $answer) {
if ($options = $DB->get_record('question_calculated', array('answer' => $key))) {
$options->tolerance = trim($fromform->tolerance[$key]);
$options->tolerancetype = trim($fromform->tolerancetype[$key]);
$options->correctanswerlength = trim($fromform->correctanswerlength[$key]);
$options->correctanswerformat = trim($fromform->correctanswerformat[$key]);
$DB->update_record('question_calculated', $options);
}
}
}
/**
* This function get the dataset items using id as unique parameter and return an
* array with itemnumber as index sorted ascendant
* If the multiple records with the same itemnumber exist, only the newest one
* i.e with the greatest id is used, the others are ignored but not deleted.
* MDL-19210
*/
public function get_database_dataset_items($definition) {
global $CFG, $DB;
$databasedataitems = $DB->get_records_sql(// Use number as key!!
" SELECT id , itemnumber, definition, value
FROM {question_dataset_items}
WHERE definition = $definition order by id DESC ", array($definition));
$dataitems = Array();
foreach ($databasedataitems as $id => $dataitem) {
if (!isset($dataitems[$dataitem->itemnumber])) {
$dataitems[$dataitem->itemnumber] = $dataitem;
}
}
ksort($dataitems);
return $dataitems;
}
public function save_dataset_items($question, $fromform) {
global $CFG, $DB;
$synchronize = false;
if (isset($fromform->nextpageparam['forceregeneration'])) {
$regenerate = $fromform->nextpageparam['forceregeneration'];
} else {
$regenerate = 0;
}
if (empty($question->options)) {
$this->get_question_options($question);
}
if (!empty($question->options->synchronize)) {
$synchronize = true;
}
// Get the old datasets for this question.
$datasetdefs = $this->get_dataset_definitions($question->id, array());
// Handle generator options...
$olddatasetdefs = fullclone($datasetdefs);
$datasetdefs = $this->update_dataset_options($datasetdefs, $fromform);
$maxnumber = -1;
foreach ($datasetdefs as $defid => $datasetdef) {
if (isset($datasetdef->id)
&& $datasetdef->options != $olddatasetdefs[$defid]->options) {
// Save the new value for options.
$DB->update_record('question_dataset_definitions', $datasetdef);
}
// Get maxnumber.
if ($maxnumber == -1 || $datasetdef->itemcount < $maxnumber) {
$maxnumber = $datasetdef->itemcount;
}
}
// Handle adding and removing of dataset items.
$i = 1;
if ($maxnumber > self::MAX_DATASET_ITEMS) {
$maxnumber = self::MAX_DATASET_ITEMS;
}
ksort($fromform->definition);
foreach ($fromform->definition as $key => $defid) {
// If the delete button has not been pressed then skip the datasetitems
// in the 'add item' part of the form.
if ($i > count($datasetdefs)*$maxnumber) {
break;
}
$addeditem = new stdClass();
$addeditem->definition = $datasetdefs[$defid]->id;
$addeditem->value = $fromform->number[$i];
$addeditem->itemnumber = ceil($i / count($datasetdefs));
if ($fromform->itemid[$i]) {
// Reuse any previously used record.
$addeditem->id = $fromform->itemid[$i];
$DB->update_record('question_dataset_items', $addeditem);
} else {
$DB->insert_record('question_dataset_items', $addeditem);
}
$i++;
}
if (isset($addeditem->itemnumber) && $maxnumber < $addeditem->itemnumber
&& $addeditem->itemnumber < self::MAX_DATASET_ITEMS) {
$maxnumber = $addeditem->itemnumber;
foreach ($datasetdefs as $key => $newdef) {
if (isset($newdef->id) && $newdef->itemcount <= $maxnumber) {
$newdef->itemcount = $maxnumber;
// Save the new value for options.
$DB->update_record('question_dataset_definitions', $newdef);
}
}
}
// Adding supplementary items.
$numbertoadd = 0;
if (isset($fromform->addbutton) && $fromform->selectadd > 0 &&
$maxnumber < self::MAX_DATASET_ITEMS) {
$numbertoadd = $fromform->selectadd;
if (self::MAX_DATASET_ITEMS - $maxnumber < $numbertoadd) {
$numbertoadd = self::MAX_DATASET_ITEMS - $maxnumber;
}
// Add the other items.
// Generate a new dataset item (or reuse an old one).
foreach ($datasetdefs as $defid => $datasetdef) {
// In case that for category datasets some new items has been added,
// get actual values.
// Fix regenerate for this datadefs.
$defregenerate = 0;
if ($synchronize &&
!empty ($fromform->nextpageparam["datasetregenerate[{$datasetdef->name}"])) {
$defregenerate = 1;
} else if (!$synchronize &&
(($regenerate == 1 && $datasetdef->category == 0) ||$regenerate == 2)) {
$defregenerate = 1;
}
if (isset($datasetdef->id)) {
$datasetdefs[$defid]->items =
$this->get_database_dataset_items($datasetdef->id);
}
for ($numberadded = $maxnumber+1; $numberadded <= $maxnumber + $numbertoadd; $numberadded++) {
if (isset($datasetdefs[$defid]->items[$numberadded])) {
// In case of regenerate it modifies the already existing record.
if ($defregenerate) {
$datasetitem = new stdClass();
$datasetitem->id = $datasetdefs[$defid]->items[$numberadded]->id;
$datasetitem->definition = $datasetdef->id;
$datasetitem->itemnumber = $numberadded;
$datasetitem->value =
$this->generate_dataset_item($datasetdef->options);
$DB->update_record('question_dataset_items', $datasetitem);
}
// If not regenerate do nothing as there is already a record.
} else {
$datasetitem = new stdClass();
$datasetitem->definition = $datasetdef->id;
$datasetitem->itemnumber = $numberadded;
if ($this->supports_dataset_item_generation()) {
$datasetitem->value =
$this->generate_dataset_item($datasetdef->options);
} else {
$datasetitem->value = '';
}
$DB->insert_record('question_dataset_items', $datasetitem);