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questiontype.php
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<?php
// This file is part of Stack - http://stack.maths.ed.ac.uk/
//
// Stack 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.
//
// Stack 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 Stack. If not, see <http://www.gnu.org/licenses/>.
/**
* Question type class for the Stack question type.
*
* @package qtype_stack
* @copyright 2012 The Open University
* @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(__DIR__ . '/stack/input/factory.class.php');
require_once(__DIR__ . '/stack/answertest/controller.class.php');
require_once(__DIR__ . '/stack/cas/keyval.class.php');
require_once(__DIR__ . '/stack/cas/castext2/castext2_evaluatable.class.php');
require_once(__DIR__ . '/stack/cas/castext2/castext2_static_replacer.class.php');
require_once(__DIR__ . '/stack/questiontest.php');
require_once(__DIR__ . '/stack/prt.class.php');
require_once(__DIR__ . '/stack/potentialresponsetreestate.class.php');
require_once(__DIR__ . '/stack/prt.class.php');
require_once(__DIR__ . '/stack/graphlayout/graph.php');
require_once(__DIR__ . '/lang/multilang.php');
require_once(__DIR__ . '/stack/prt.class.php');
/**
* Stack question type class.
*
* @copyright 2012 The Open University
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qtype_stack extends question_type {
/** @var int array key into the results of get_input_names_from_question_text for the count of input placeholders. */
const INPUTS = 0;
/** @var int array key into the results of get_input_names_from_question_text for the count of validation placeholders. */
const VALIDATIONS = 1;
/** @var int the CAS seed using during validation. */
protected $seed = 1;
/** @var stack_options the CAS options using during validation. */
protected $options;
/**
* @var array prt name => stack_abstract_graph caches the result of
* {@link get_prt_graph()}.
*/
protected $prtgraph = array();
public function save_question($question, $fromform) {
if (!empty($fromform->fixdollars)) {
$this->fix_dollars_in_form_data($fromform);
}
$fromform->penalty = stack_utils::fix_approximate_thirds($fromform->penalty);
// If this questions is being derived from another one (either duplicate in any
// Moodle version, or editing making a new version in Moodle 4.0+) then we need
// to get the deployed variants and question tests, so they can be copied too.
// The property used seems to be the reliable way to get the old question id.
if (isset($question->options->questionid) && $question->options->questionid) {
$fromform->deployedseeds = $this->get_question_deployed_seeds($question->options->questionid);
$fromform->testcases = $this->load_question_tests($question->options->questionid);
}
$new = parent::save_question($question, $fromform);
return $new;
}
/**
* Replace any $...$ and $$...$$ delimiters in the question text from the
* form with the recommended delimiters.
* @param object $fromform the data from the form.
*/
protected function fix_dollars_in_form_data($fromform) {
$questionfields = array('questiontext', 'generalfeedback', 'specificfeedback',
'prtcorrect', 'prtpartiallycorrect', 'prtincorrect', 'questiondescription');
foreach ($questionfields as $field) {
$fromform->{$field}['text'] = stack_maths::replace_dollars($fromform->{$field}['text']);
}
$fromform->questionnote = stack_maths::replace_dollars($fromform->questionnote);
$prtnames = array_keys($this->get_prt_names_from_question($fromform->questiontext['text'],
$fromform->specificfeedback['text']));
foreach ($prtnames as $prt) {
foreach ($fromform->{$prt . 'truefeedback'} as &$feedback) {
$feedback['text'] = stack_maths::replace_dollars($feedback['text']);
}
foreach ($fromform->{$prt . 'falsefeedback'} as &$feedback) {
$feedback['text'] = stack_maths::replace_dollars($feedback['text']);
}
}
foreach ($fromform->hint as &$hint) {
$hint['text'] = stack_maths::replace_dollars($hint['text']);
}
}
public function save_question_options($fromform) {
global $DB;
$context = $fromform->context;
parent::save_question_options($fromform);
$options = $DB->get_record('qtype_stack_options', array('questionid' => $fromform->id));
if (!$options) {
$options = new stdClass();
$options->questionid = $fromform->id;
$options->questionvariables = '';
$options->questionnote = '';
$options->questiondescription = '';
$options->specificfeedback = '';
$options->prtcorrect = '';
$options->prtpartiallycorrect = '';
$options->prtincorrect = '';
$options->stackversion = get_config('qtype_stack', 'version');
$options->id = $DB->insert_record('qtype_stack_options', $options);
}
$options->stackversion = $fromform->stackversion;
$options->questionvariables = $fromform->questionvariables;
$options->specificfeedback = $this->import_or_save_files($fromform->specificfeedback,
$context, 'qtype_stack', 'specificfeedback', $fromform->id);
$options->specificfeedbackformat = $fromform->specificfeedback['format'];
$options->questionnote = $fromform->questionnote;
$options->questiondescription = $this->import_or_save_files($fromform->questiondescription,
$context, 'qtype_stack', 'questiondescription', $fromform->id);
$options->questiondescriptionformat = $fromform->questiondescription['format'];
$options->questionsimplify = $fromform->questionsimplify;
$options->assumepositive = $fromform->assumepositive;
$options->assumereal = $fromform->assumereal;
$options->prtcorrect = $this->import_or_save_files($fromform->prtcorrect,
$context, 'qtype_stack', 'prtcorrect', $fromform->id);
$options->prtcorrectformat = $fromform->prtcorrect['format'];
$options->prtpartiallycorrect = $this->import_or_save_files($fromform->prtpartiallycorrect,
$context, 'qtype_stack', 'prtpartiallycorrect', $fromform->id);
$options->prtpartiallycorrectformat = $fromform->prtpartiallycorrect['format'];
$options->prtincorrect = $this->import_or_save_files($fromform->prtincorrect,
$context, 'qtype_stack', 'prtincorrect', $fromform->id);
$options->prtincorrectformat = $fromform->prtincorrect['format'];
$options->decimals = $fromform->decimals;
$options->multiplicationsign = $fromform->multiplicationsign;
$options->sqrtsign = $fromform->sqrtsign;
$options->complexno = $fromform->complexno;
$options->inversetrig = $fromform->inversetrig;
$options->logicsymbol = $fromform->logicsymbol;
$options->matrixparens = $fromform->matrixparens;
$options->variantsselectionseed = $fromform->variantsselectionseed;
// We will not have the values for this.
$options->compiledcache = '{}';
$DB->update_record('qtype_stack_options', $options);
$inputnames = array_keys($this->get_input_names_from_question_text_lang($fromform->questiontext));
$inputs = $DB->get_records('qtype_stack_inputs',
array('questionid' => $fromform->id), '', 'name, id, questionid');
$questionhasinputs = false;
foreach ($inputnames as $inputname) {
if (array_key_exists($inputname, $inputs)) {
$input = $inputs[$inputname];
unset($inputs[$inputname]);
} else {
$input = new stdClass();
$input->questionid = $fromform->id;
$input->name = $inputname;
$input->options = '';
$input->id = $DB->insert_record('qtype_stack_inputs', $input);
}
$input->type = $fromform->{$inputname . 'type'};
$input->tans = $fromform->{$inputname . 'modelans'};
$input->boxsize = $fromform->{$inputname . 'boxsize'};
// TODO: remove this when we remove strictsyntax from the DB.
$input->strictsyntax = true;
$input->insertstars = $fromform->{$inputname . 'insertstars'};
$input->syntaxhint = $fromform->{$inputname . 'syntaxhint'};
$input->syntaxattribute = $fromform->{$inputname . 'syntaxattribute'};
$input->forbidwords = $fromform->{$inputname . 'forbidwords'};
$input->allowwords = $fromform->{$inputname . 'allowwords'};
$input->forbidfloat = $fromform->{$inputname . 'forbidfloat'};
$input->requirelowestterms = $fromform->{$inputname . 'requirelowestterms'};
$input->checkanswertype = $fromform->{$inputname . 'checkanswertype'};
$input->mustverify = $fromform->{$inputname . 'mustverify'};
$input->showvalidation = $fromform->{$inputname . 'showvalidation'};
$input->options = $fromform->{$inputname . 'options'};
$questionhasinputs = true;
$DB->update_record('qtype_stack_inputs', $input);
}
if ($inputs) {
list($test, $params) = $DB->get_in_or_equal(array_keys($inputs));
$params[] = $fromform->id;
$DB->delete_records_select('qtype_stack_inputs',
'name ' . $test . ' AND questionid = ?', $params);
}
if (!$questionhasinputs) {
// A question with no inputs is an information item.
$DB->set_field('question', 'length', 0, array('id' => $fromform->id));
}
$prtnames = array_keys($this->get_prt_names_from_question($fromform->questiontext, $options->specificfeedback));
$prts = $DB->get_records('qtype_stack_prts',
array('questionid' => $fromform->id), '', 'name, id, questionid');
foreach ($prtnames as $prtname) {
if (array_key_exists($prtname, $prts)) {
$prt = $prts[$prtname];
unset($prts[$prtname]);
} else {
$prt = new stdClass();
$prt->questionid = $fromform->id;
$prt->name = $prtname;
$prt->feedbackvariables = '';
$prt->firstnodename = 0;
$prt->id = $DB->insert_record('qtype_stack_prts', $prt);
}
// Find the root node of the PRT.
// Otherwise, if an existing question is being edited, and this is an
// existing PRT, base things on the existing question definition.
$graph = new stack_abstract_graph();
foreach ($fromform->{$prtname . 'answertest'} as $nodename => $notused) {
$description = $fromform->{$prtname . 'description'}[$nodename];
$truenextnode = $fromform->{$prtname . 'truenextnode'}[$nodename];
$falsenextnode = $fromform->{$prtname . 'falsenextnode'}[$nodename];
if ($truenextnode == -1) {
$left = null;
} else {
$left = $truenextnode + 1;
}
if ($falsenextnode == -1) {
$right = null;
} else {
$right = $falsenextnode + 1;
}
$graph->add_prt_node($nodename + 1, $description, $left, $right);
}
$graph->layout();
$roots = $graph->get_roots();
if (count($roots) != 1 || $graph->get_broken_cycles()) {
throw new coding_exception('The PRT ' . $prtname . ' is malformed.');
}
reset($roots);
$firstnode = key($roots) - 1;
$prt->value = $fromform->{$prtname . 'value'};
$prt->autosimplify = $fromform->{$prtname . 'autosimplify'};
$prt->feedbackstyle = $fromform->{$prtname . 'feedbackstyle'};
$prt->feedbackvariables = $fromform->{$prtname . 'feedbackvariables'};
$prt->firstnodename = $firstnode;
$DB->update_record('qtype_stack_prts', $prt);
$nodes = $DB->get_records('qtype_stack_prt_nodes',
array('questionid' => $fromform->id, 'prtname' => $prtname),
'', 'nodename, id, questionid, prtname');
foreach ($fromform->{$prtname . 'answertest'} as $nodename => $notused) {
if (array_key_exists($nodename, $nodes)) {
$node = $nodes[$nodename];
unset($nodes[$nodename]);
} else {
$node = new stdClass();
$node->questionid = $fromform->id;
$node->prtname = $prtname;
$node->nodename = $nodename;
$node->truefeedback = '';
$node->falsefeedback = '';
$node->id = $DB->insert_record('qtype_stack_prt_nodes', $node);
}
$node->description = $fromform->{$prtname . 'description'}[$nodename];
$node->answertest = $fromform->{$prtname . 'answertest'}[$nodename];
$node->sans = $fromform->{$prtname . 'sans'}[$nodename];
$node->tans = $fromform->{$prtname . 'tans'}[$nodename];
// For input types which do not have test options, the input field is hidden
// and therefore null is passed to $node->testoptions, which crashes the form.
// The empty string should be used instead. (Also see issue #974).
$node->testoptions = '';
if (property_exists($fromform, $prtname . 'testoptions')) {
if (array_key_exists($nodename, $fromform->{$prtname . 'testoptions'})) {
$node->testoptions = $fromform->{$prtname . 'testoptions'}[$nodename];
}
}
$node->quiet = $fromform->{$prtname . 'quiet'}[$nodename];
$node->truescoremode = $fromform->{$prtname . 'truescoremode'}[$nodename];
$node->truescore = $fromform->{$prtname . 'truescore'}[$nodename];
if (property_exists($fromform, $prtname . 'truepenalty')) {
$node->truepenalty = stack_utils::fix_approximate_thirds(
$fromform->{$prtname . 'truepenalty'}[$nodename]);
} else {
// Else we just deleted a PRT.
$node->truepenalty = '';
}
$node->truenextnode = $fromform->{$prtname . 'truenextnode'}[$nodename];
$node->trueanswernote = $fromform->{$prtname . 'trueanswernote'}[$nodename];
$node->truefeedback = $this->import_or_save_files(
$fromform->{$prtname . 'truefeedback'}[$nodename],
$context, 'qtype_stack', 'prtnodetruefeedback', $node->id);
$node->truefeedbackformat = $fromform->{$prtname . 'truefeedback'}[$nodename]['format'];
$node->falsescoremode = $fromform->{$prtname . 'falsescoremode'}[$nodename];
$node->falsescore = $fromform->{$prtname . 'falsescore'}[$nodename];
if (property_exists($fromform, $prtname . 'falsepenalty')) {
$node->falsepenalty = stack_utils::fix_approximate_thirds(
$fromform->{$prtname . 'falsepenalty'}[$nodename]);
} else {
// Else we just deleted a PRT.
$node->falsepenalty = '';
}
$node->falsenextnode = $fromform->{$prtname . 'falsenextnode'}[$nodename];
$node->falseanswernote = $fromform->{$prtname . 'falseanswernote'}[$nodename];
$node->falsefeedback = $this->import_or_save_files(
$fromform->{$prtname . 'falsefeedback'}[$nodename],
$context, 'qtype_stack', 'prtnodefalsefeedback', $node->id);
$node->falsefeedbackformat = $fromform->{$prtname . 'falsefeedback'}[$nodename]['format'];
if ('' === $node->truepenalty) {
$node->truepenalty = null;
}
if ('' === $node->falsepenalty) {
$node->falsepenalty = null;
}
$DB->update_record('qtype_stack_prt_nodes', $node);
}
if ($nodes) {
list($test, $params) = $DB->get_in_or_equal(array_keys($nodes));
$params[] = $fromform->id;
$params[] = $prt->name;
$DB->delete_records_select('qtype_stack_prt_nodes',
'nodename ' . $test . ' AND questionid = ? AND prtname = ?', $params);
}
}
if ($prts) {
list($test, $params) = $DB->get_in_or_equal(array_keys($prts));
$params[] = $fromform->id;
$DB->delete_records_select('qtype_stack_prt_nodes',
'prtname ' . $test . ' AND questionid = ?', $params);
$DB->delete_records_select('qtype_stack_prts',
'name ' . $test . ' AND questionid = ?', $params);
}
$this->save_hints($fromform);
if (isset($fromform->deployedseeds)) {
$DB->delete_records('qtype_stack_deployed_seeds', array('questionid' => $fromform->id));
foreach ($fromform->deployedseeds as $deployedseed) {
$record = new stdClass();
$record->questionid = $fromform->id;
$record->seed = $deployedseed;
$DB->insert_record('qtype_stack_deployed_seeds', $record, false);
}
}
if (isset($fromform->testcases)) {
// If the data includes the definition of the question tests that there
// should be (i.e. when doing import) then replace the existing set
// of tests with the new one.
$this->save_question_tests($fromform->id, $fromform->testcases);
}
// Irrespective of what else has happened, ensure there is no garbage
// in the database, for example if we delete a PRT, remove the expected
// values for that PRT while leaving the rest of the testcases alone.
list($nametest, $params) = $DB->get_in_or_equal($inputnames, SQL_PARAMS_NAMED, 'input', false, null);
$params['questionid'] = $fromform->id;
$DB->delete_records_select('qtype_stack_qtest_inputs',
'questionid = :questionid AND inputname ' . $nametest, $params);
list($nametest, $params) = $DB->get_in_or_equal($prtnames, SQL_PARAMS_NAMED, 'prt', false, null);
$params['questionid'] = $fromform->id;
$DB->delete_records_select('qtype_stack_qtest_expected',
'questionid = :questionid AND prtname ' . $nametest, $params);
}
public function get_question_options($question) {
global $DB;
parent::get_question_options($question);
$question->options = $DB->get_record('qtype_stack_options',
array('questionid' => $question->id), '*', MUST_EXIST);
$question->inputs = $DB->get_records('qtype_stack_inputs',
array('questionid' => $question->id), 'name',
'name, id, questionid, type, tans, boxsize, strictsyntax, insertstars, ' .
'syntaxhint, syntaxattribute, forbidwords, allowwords, forbidfloat, requirelowestterms, ' .
'checkanswertype, mustverify, showvalidation, options');
$question->prts = $DB->get_records('qtype_stack_prts',
array('questionid' => $question->id), 'name',
'name, id, questionid, value, autosimplify, feedbackstyle, feedbackvariables, firstnodename');
$noders = $DB->get_recordset('qtype_stack_prt_nodes',
array('questionid' => $question->id),
'prtname, nodename, description');
foreach ($noders as $node) {
if (!property_exists($question->prts[$node->prtname], 'nodes')) {
$question->prts[$node->prtname]->nodes = [];
}
$question->prts[$node->prtname]->nodes[$node->nodename] = $node;
}
$noders->close();
$question->deployedseeds = $this->get_question_deployed_seeds($question->id);
return true;
}
protected function get_question_deployed_seeds($qid) {
global $DB;
return $DB->get_fieldset_sql('
SELECT seed
FROM {qtype_stack_deployed_seeds}
WHERE questionid = ?
ORDER BY id', array($qid));
}
protected function initialise_question_instance(question_definition $question, $questiondata) {
parent::initialise_question_instance($question, $questiondata);
$question->stackversion = $questiondata->options->stackversion;
$question->questionvariables = $questiondata->options->questionvariables;
$question->questionnote = $questiondata->options->questionnote;
$question->questiondescription = $questiondata->options->questiondescription;
$question->questiondescriptionformat = $questiondata->options->questiondescriptionformat;
$question->specificfeedback = $questiondata->options->specificfeedback;
$question->specificfeedbackformat = $questiondata->options->specificfeedbackformat;
$question->prtcorrect = $questiondata->options->prtcorrect;
$question->prtcorrectformat = $questiondata->options->prtcorrectformat;
$question->prtpartiallycorrect = $questiondata->options->prtpartiallycorrect;
$question->prtpartiallycorrectformat = $questiondata->options->prtpartiallycorrectformat;
$question->prtincorrect = $questiondata->options->prtincorrect;
$question->prtincorrectformat = $questiondata->options->prtincorrectformat;
$question->variantsselectionseed = $questiondata->options->variantsselectionseed;
$question->compiledcache = $questiondata->options->compiledcache;
// Parse the cache in advance.
if (is_string($question->compiledcache)) {
$question->compiledcache = json_decode($question->compiledcache, true);
} else if ($question->compiledcache === null) {
// If someone has done nulling through the database.
$question->compiledcache = [];
}
$question->options = new stack_options();
$question->options->set_option('decimals', $questiondata->options->decimals);
$question->options->set_option('multiplicationsign', $questiondata->options->multiplicationsign);
$question->options->set_option('complexno', $questiondata->options->complexno);
$question->options->set_option('inversetrig', $questiondata->options->inversetrig);
$question->options->set_option('logicsymbol', $questiondata->options->logicsymbol);
$question->options->set_option('matrixparens', $questiondata->options->matrixparens);
$question->options->set_option('sqrtsign', (bool) $questiondata->options->sqrtsign);
$question->options->set_option('simplify', (bool) $questiondata->options->questionsimplify);
$question->options->set_option('assumepos', (bool) $questiondata->options->assumepositive);
$question->options->set_option('assumereal', (bool) $questiondata->options->assumereal);
$requiredparams = stack_input_factory::get_parameters_used();
foreach (stack_utils::extract_placeholders($question->questiontext, 'input') as $name) {
$inputdata = $questiondata->inputs[$name];
$allparameters = array(
'boxWidth' => $inputdata->boxsize,
'strictSyntax' => true,
'insertStars' => (int) $inputdata->insertstars,
'syntaxHint' => $inputdata->syntaxhint,
'syntaxAttribute' => $inputdata->syntaxattribute,
'forbidWords' => $inputdata->forbidwords,
'allowWords' => $inputdata->allowwords,
'forbidFloats' => (bool) $inputdata->forbidfloat,
'lowestTerms' => (bool) $inputdata->requirelowestterms,
'sameType' => (bool) $inputdata->checkanswertype,
'mustVerify' => (bool) $inputdata->mustverify,
'showValidation' => $inputdata->showvalidation,
'options' => $inputdata->options,
);
$parameters = array();
foreach ($requiredparams[$inputdata->type] as $paramname) {
if ($paramname == 'inputType') {
continue;
}
$parameters[$paramname] = $allparameters[$paramname];
}
$question->inputs[$name] = stack_input_factory::make(
$inputdata->type, $inputdata->name, $inputdata->tans, $question->options, $parameters);
}
$prtnames = array_keys($this->get_prt_names_from_question($question->questiontext, $question->specificfeedback));
$totalvalue = 0;
$allformative = true;
foreach ($prtnames as $name) {
// If not then we have just created the PRT.
if (array_key_exists($name, $questiondata->prts)) {
$prtdata = $questiondata->prts[$name];
// At this point we do not have the PRT method is_formative() available to us.
if ($prtdata->feedbackstyle > 0) {
$totalvalue += $prtdata->value;
$allformative = false;
}
}
}
if ($questiondata->prts && !$allformative && $totalvalue < 0.0000001) {
throw new coding_exception('There is an error authoring your question. ' .
'The $totalvalue, the marks available for the question, must be positive in question ' .
$question->name);
}
foreach ($prtnames as $name) {
if (array_key_exists($name, $questiondata->prts)) {
$prtvalue = 0;
if (!$allformative) {
$prtvalue = $questiondata->prts[$name]->value / $totalvalue;
}
$question->prts[$name] = new stack_potentialresponse_tree_lite($questiondata->prts[$name],
$prtvalue, $question);
} // If not we just added a PRT.
}
$question->deployedseeds = array_values($questiondata->deployedseeds);
}
/**
* Get the URL params required for linking to associated scripts like
* questiontestrun.php.
*
* @param stdClass|qtype_stack_question $question question data, as from question_bank::load_question
* or question_bank::load_question_data.
* @return array of URL params. Can be passed to moodle_url.
*/
protected function get_question_url_params($question) {
$urlparams = array('questionid' => $question->id);
if (property_exists($question, 'seed')) {
$urlparams['seed'] = $question->seed;
}
// This is a bit of a hack to find the right thing to put in the URL.
// If we are already on a URL that gives us a clue what to do, use that.
$context = context::instance_by_id($question->contextid);
if ($cmid = optional_param('cmid', null, PARAM_INT)) {
$urlparams['cmid'] = $cmid;
} else if ($courseid = optional_param('courseid', null, PARAM_INT)) {
$urlparams['courseid'] = $courseid;
} else if ($context->contextlevel == CONTEXT_MODULE) {
$urlparams['cmid'] = $context->instanceid;
} else if ($context->contextlevel == CONTEXT_COURSE) {
$urlparams['courseid'] = $context->instanceid;
} else {
$urlparams['courseid'] = get_site()->id;
}
return $urlparams;
}
/**
* Get the URL for questiontestrun.php for a question.
*
* @param stdClass|qtype_stack_question $question question data, as from question_bank::load_question
* or question_bank::load_question_data.
* @return moodle_url the URL.
*/
public function get_question_test_url($question) {
$linkparams = $this->get_question_url_params($question);
return new moodle_url('/question/type/stack/questiontestrun.php', $linkparams);
}
/**
* Get the URL for tidyquestion.php for a question.
*
* @param stdClass|qtype_stack_question $question question data, as from question_bank::load_question
* or question_bank::load_question_data.
* @return moodle_url the URL.
*/
public function get_tidy_question_url($question) {
$linkparams = $this->get_question_url_params($question);
return new moodle_url('/question/type/stack/tidyquestion.php', $linkparams);
}
public function get_extra_question_bank_actions(stdClass $question): array {
$actions = parent::get_extra_question_bank_actions($question);
$linkparams = $this->get_question_url_params($question);
// Directly link to question tests and deployed variants.
if (question_has_capability_on($question, 'view')) {
$actions[] = new \action_menu_link_secondary(
new moodle_url('/question/type/stack/questiontestrun.php', $linkparams),
new \pix_icon('t/approve', ''),
get_string('runquestiontests', 'qtype_stack'));
}
// Directly link to tidy question script.
if (question_has_capability_on($question, 'view')) {
$actions[] = new \action_menu_link_secondary(
new moodle_url('/question/type/stack/tidyquestion.php', $linkparams),
new \pix_icon('t/edit', ''),
get_string('tidyquestion', 'qtype_stack'));
}
return $actions;
}
public function delete_question($questionid, $contextid) {
global $DB;
$this->delete_question_tests($questionid);
$DB->delete_records('qtype_stack_deployed_seeds', array('questionid' => $questionid));
$DB->delete_records('qtype_stack_prt_nodes', array('questionid' => $questionid));
$DB->delete_records('qtype_stack_prts', array('questionid' => $questionid));
$DB->delete_records('qtype_stack_inputs', array('questionid' => $questionid));
$DB->delete_records('qtype_stack_options', array('questionid' => $questionid));
parent::delete_question($questionid, $contextid);
}
public function move_files($questionid, $oldcontextid, $newcontextid) {
global $DB;
$fs = get_file_storage();
parent::move_files($questionid, $oldcontextid, $newcontextid);
$this->move_files_in_hints($questionid, $oldcontextid, $newcontextid);
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'specificfeedback', $questionid);
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'questiondescription', $questionid);
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'prtcorrect', $questionid);
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'prtpartiallycorrect', $questionid);
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'prtincorrect', $questionid);
$nodeids = $DB->get_records_menu('qtype_stack_prt_nodes', array('questionid' => $questionid), 'id', 'id,1');
foreach ($nodeids as $nodeid => $notused) {
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'prtnodetruefeedback', $nodeid);
$fs->move_area_files_to_new_context($oldcontextid, $newcontextid,
'qtype_stack', 'prtnodefalsefeedback', $nodeid);
}
}
protected function delete_files($questionid, $contextid) {
global $DB;
$fs = get_file_storage();
parent::delete_files($questionid, $contextid);
$this->delete_files_in_hints($questionid, $contextid);
$fs->delete_area_files($contextid, 'qtype_stack', 'specificfeedback', $questionid);
$fs->delete_area_files($contextid, 'qtype_stack', 'questiondescription', $questionid);
$fs->delete_area_files($contextid, 'qtype_stack', 'prtcorrect', $questionid);
$fs->delete_area_files($contextid, 'qtype_stack', 'prtpartiallycorrect', $questionid);
$fs->delete_area_files($contextid, 'qtype_stack', 'prtincorrect', $questionid);
$nodeids = $DB->get_records_menu('qtype_stack_prt_nodes', array('questionid' => $questionid), 'id', 'id,1');
foreach ($nodeids as $nodeid => $notused) {
$fs->delete_area_files($oldcontextid, $newcontextid,
'qtype_stack', 'prtnodetruefeedback', $nodeid);
$fs->delete_area_files($oldcontextid, $newcontextid,
'qtype_stack', 'prtnodefalsefeedback', $nodeid);
}
}
/**
* Save a set of question tests for a question, replacing any existing tests.
* @param int $questionid the question id of the question we are manipulating the tests for.
* @param array $testcases testcase number => stack_question_test
*/
public function save_question_tests($questionid, $testcases) {
global $DB;
$transaction = $DB->start_delegated_transaction();
$this->delete_question_tests($questionid);
foreach ($testcases as $number => $testcase) {
$this->save_question_test($questionid, $testcase, $number);
}
$transaction->allow_commit();
}
/**
* Save a question tests for a question, either replacing the test at a given
* number, or adding a new test, either with a given number, or taking the
* first unused number.
* @param int $questionid the question id of the question we are manipulating the tests for.
* @param stack_question_test $qtest
* @param int $testcases testcase number to replace/add. If not given, the first unused number is found.
*/
public function save_question_test($questionid, stack_question_test $qtest, $testcase = null) {
global $DB;
$transaction = $DB->start_delegated_transaction();
// Limit the length of descriptions.
$description = substr($qtest->description, 0, 255);
if (!$testcase || !$DB->record_exists('qtype_stack_qtests',
array('questionid' => $questionid, 'testcase' => $testcase))) {
// Find the first unused testcase number.
$testcase = $DB->get_field_sql('
SELECT MIN(qt.testcase) + 1
FROM (
SELECT testcase FROM {qtype_stack_qtests} WHERE questionid = ?
UNION
SELECT 0
) qt
LEFT JOIN {qtype_stack_qtests} qt2 ON qt2.questionid = ? AND
qt2.testcase = qt.testcase + 1
WHERE qt2.id IS NULL
', array($questionid, $questionid));
$testcasedata = new stdClass();
$testcasedata->questionid = $questionid;
$testcasedata->testcase = $testcase;
$testcasedata->description = $description;
$testcasedata->timemodified = time();
$DB->insert_record('qtype_stack_qtests', $testcasedata);
} else {
$DB->set_field('qtype_stack_qtests', 'timemodified', time(),
array('questionid' => $questionid, 'testcase' => $testcase));
$DB->set_field('qtype_stack_qtests', 'description', $description,
array('questionid' => $questionid, 'testcase' => $testcase));
}
// Save the input data.
$DB->delete_records('qtype_stack_qtest_inputs', array('questionid' => $questionid, 'testcase' => $testcase));
foreach ($qtest->inputs as $name => $value) {
$testinput = new stdClass();
$testinput->questionid = $questionid;
$testinput->testcase = $testcase;
$testinput->inputname = $name;
$testinput->value = $value;
$DB->insert_record('qtype_stack_qtest_inputs', $testinput);
}
// Save the expected outcome data.
$DB->delete_records('qtype_stack_qtest_expected', array('questionid' => $questionid, 'testcase' => $testcase));
foreach ($qtest->expectedresults as $prtname => $expectedresults) {
$expected = new stdClass();
$expected->questionid = $questionid;
$expected->testcase = $testcase;
$expected->prtname = $prtname;
if ($expectedresults->score === '' || $expectedresults->score === null) {
$expected->expectedscore = null;
} else {
$expected->expectedscore = (float) $expectedresults->score;
}
if ($expectedresults->penalty === '' || $expectedresults->penalty === null) {
$expected->expectedpenalty = null;
} else {
$expected->expectedpenalty = stack_utils::fix_approximate_thirds(
(float) $expectedresults->penalty);
}
$expected->expectedanswernote = $expectedresults->answernotes[0];
$DB->insert_record('qtype_stack_qtest_expected', $expected);
}
$transaction->allow_commit();
}
/**
* Deploy a variant of a question.
* @param int $questionid the question id.
* @param int $seed the seed to deploy.
*/
public function deploy_variant($questionid, $seed) {
global $DB;
$record = new stdClass();
$record->questionid = $questionid;
$record->seed = $seed;
$DB->insert_record('qtype_stack_deployed_seeds', $record);
$this->notify_question_edited($questionid);
}
/**
* Un-deploy a variant of a question.
* @param int $questionid the question id.
* @param int $seed the seed to un-deploy.
*/
public function undeploy_variant($questionid, $seed) {
global $DB;
$DB->delete_records('qtype_stack_deployed_seeds',
array('questionid' => $questionid, 'seed' => $seed));
$this->notify_question_edited($questionid);
}
/**
* Rename an input in the question data. It is the caller's responsibility
* to ensure that the $to name will not violate any unique constraints.
* @param int $questionid the question id.
* @param string $from the input to rename.
* @param string $to the new name to give it.
*/
public function rename_input($questionid, $from, $to) {
global $DB;
$transaction = $DB->start_delegated_transaction();
// Place-holders in the question text.
$questiontext = $DB->get_field('question', 'questiontext', array('id' => $questionid));
$questiontext = str_replace(array("[[input:{$from}]]", "[[validation:{$from}]]"),
array("[[input:{$to}]]", "[[validation:{$to}]]"), $questiontext);
$DB->set_field('question', 'questiontext', $questiontext, array('id' => $questionid));
// Input names in question test data.
$DB->set_field('qtype_stack_qtest_inputs', 'inputname', $to,
array('questionid' => $questionid, 'inputname' => $from));
// The input itself.
$DB->set_field('qtype_stack_inputs', 'name', $to,
array('questionid' => $questionid, 'name' => $from));
$regex = '~\b' . preg_quote($from, '~') . '\b~';
// Where the input name appears in expressions in PRTs.
$prts = $DB->get_records('qtype_stack_prts', array('questionid' => $questionid),
'id, feedbackvariables');
foreach ($prts as $prt) {
$prt->feedbackvariables = preg_replace($regex, $to, $prt->feedbackvariables, -1, $changes);
if ($changes) {
$DB->update_record('qtype_stack_prts', $prt);
}
}
// Where the input name appears in expressions in PRT node.
$nodes = $DB->get_records('qtype_stack_prt_nodes', array('questionid' => $questionid),
'id, sans, tans, testoptions, truefeedback, falsefeedback');
foreach ($nodes as $node) {
$changes = false;
$node->sans = preg_replace($regex, $to, $node->sans, -1, $count);
$changes = $changes || $count;
$node->tans = preg_replace($regex, $to, $node->tans, -1, $count);
$changes = $changes || $count;
$node->testoptions = preg_replace($regex, $to, $node->testoptions, -1, $count);
$changes = $changes || $count;
$node->truefeedback = preg_replace($regex, $to, $node->truefeedback, -1, $count);
$changes = $changes || $count;
$node->falsefeedback = preg_replace($regex, $to, $node->falsefeedback, -1, $count);
$changes = $changes || $count;
if ($changes) {
$DB->update_record('qtype_stack_prt_nodes', $node);
}
}
// If someone plays with input names we need to clear compiledcache.
$sql = 'UPDATE {qtype_stack_options} SET compiledcache = ? WHERE questionid = ?';
$params[] = '{}';
$params[] = $questionid;
$DB->execute($sql, $params);
$transaction->allow_commit();
$this->notify_question_edited($questionid);
}
/**
* Rename a PRT in the question data. It is the caller's responsibility
* to ensure that the $to name will not violate any unique constraints.
* @param int $questionid the question id.
* @param string $from the PRT to rename.
* @param string $to the new name to give it.
*/
public function rename_prt($questionid, $from, $to) {
global $DB;
$transaction = $DB->start_delegated_transaction();
// Place-holders in the question text.
$questiontext = $DB->get_field('question', 'questiontext', array('id' => $questionid));
$questiontext = str_replace("[[feedback:{$from}]]", "[[feedback:{$to}]]", $questiontext);
$DB->set_field('question', 'questiontext', $questiontext, array('id' => $questionid));
// Place-holders in the specific feedback.
$specificfeedback = $DB->get_field('qtype_stack_options', 'specificfeedback',
array('questionid' => $questionid));
$specificfeedback = str_replace("[[feedback:{$from}]]", "[[feedback:{$to}]]", $specificfeedback);
$DB->set_field('qtype_stack_options', 'specificfeedback', $specificfeedback,
array('questionid' => $questionid));
// PRT names in question test data.
$DB->set_field('qtype_stack_qtest_expected', 'prtname', $to,
array('questionid' => $questionid, 'prtname' => $from));
// The PRT name in its nodes.
$DB->set_field('qtype_stack_prt_nodes', 'prtname', $to,
array('questionid' => $questionid, 'prtname' => $from));
// The PRT itself.
$DB->set_field('qtype_stack_prts', 'name', $to,
array('questionid' => $questionid, 'name' => $from));
// If someone plays with PRT names we need to clear compiledcache.
$sql = 'UPDATE {qtype_stack_options} SET compiledcache = ? WHERE questionid = ?';
$params[] = '{}';
$params[] = $questionid;
$DB->execute($sql, $params);
$transaction->allow_commit();
$this->notify_question_edited($questionid);
}
/**
* Rename a PRT node in the question data. It is the caller's responsibility
* to ensure that the $to name will not violate any unique constraints.
* @param int $questionid the question id.
* @param string $prtname the PRT that the node belongs to.
* @param string $from the input to rename.
* @param string $to the new name to give it.
*/
public function rename_prt_node($questionid, $prtname, $from, $to) {
global $DB;
$transaction = $DB->start_delegated_transaction();
// The PRT node itself.
$DB->set_field('qtype_stack_prt_nodes', 'nodename', $to,
array('questionid' => $questionid, 'prtname' => $prtname, 'nodename' => $from));
// True next node links.
$DB->set_field('qtype_stack_prt_nodes', 'truenextnode', $to,
array('questionid' => $questionid, 'prtname' => $prtname, 'truenextnode' => $from));
// False next node links.
$DB->set_field('qtype_stack_prt_nodes', 'falsenextnode', $to,
array('questionid' => $questionid, 'prtname' => $prtname, 'falsenextnode' => $from));
// PRT first node link.
$DB->set_field('qtype_stack_prts', 'firstnodename', $to,
array('questionid' => $questionid, 'name' => $prtname, 'firstnodename' => $from));
// If someone plays with PRT node names we need to clear compiledcache.
$sql = 'UPDATE {qtype_stack_options} SET compiledcache = ? WHERE questionid = ?';
$params[] = '{}';
$params[] = $questionid;
$DB->execute($sql, $params);
$transaction->allow_commit();
$this->notify_question_edited($questionid);
}
/**
* From Moodle 2.4 onwards, we need to clear the entry from the question
* cache if a question definition changes. This method deals with doing
* that without causing errors on earlier versions of Moodle.
* @param int $questionid the question id to clear from the cache.
*/
protected function notify_question_edited($questionid) {
if (method_exists('question_bank', 'notify_question_edited')) {
call_user_func(array('question_bank', 'notify_question_edited'), $questionid);
}
}
/**
* Load all the question tests for a question.
* @param int $questionid the id of the question to load the tests for.
* @return array testcase number => stack_question_test
*/
public function load_question_tests($questionid) {
global $DB;
$testinputdata = $DB->get_records('qtype_stack_qtest_inputs',
array('questionid' => $questionid), 'testcase, inputname');
$testinputs = array();
foreach ($testinputdata as $data) {
$testinputs[$data->testcase][$data->inputname] = $data->value;
}
$testcasenumbers = $DB->get_records_menu('qtype_stack_qtests',
array('questionid' => $questionid), 'testcase', 'testcase, description');
$testcases = array();
foreach ($testcasenumbers as $number => $description) {
if (!array_key_exists($number, $testinputs)) {
$testinputs[$number] = array();
}
$testcase = new stack_question_test($description, $testinputs[$number], $number);