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. /** * Multianswer question definition class. * * @package qtype * @subpackage multianswer * @copyright 2010 Pierre Pichet * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ require_once($CFG->dirroot . '/question/type/questionbase.php'); require_once($CFG->dirroot . '/question/type/shortanswer/question.php'); require_once($CFG->dirroot . '/question/type/numerical/question.php'); require_once($CFG->dirroot . '/question/type/multichoice/question.php'); /** * Represents a multianswer question. * * A multi-answer question is made of of several subquestions of various types. * You can think of it as an application of the composite pattern to qusetion * types. * * @copyright 2010 Pierre Pichet * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class qtype_multianswer_question extends question_graded_automatically_with_countback { /** @var array of question_graded_automatically. */ public $subquestions = array(); /** * @var array place number => insex in the $subquestions array. Places are * numbered from 1. */ public $places; /** * @var array of strings, one longer than $places, which is achieved by * indexing from 0. The bits of question text that go between the subquestions. */ public $textfragments; /** * Get a question_attempt_step_subquestion_adapter * @param question_attempt_step $step the step to adapt. * @param int $i the subquestion index. * @return question_attempt_step_subquestion_adapter. */ protected function get_substep($step, $i) { return new question_attempt_step_subquestion_adapter($step, 'sub' . $i . '_'); } public function start_attempt(question_attempt_step $step, $variant) { foreach ($this->subquestions as $i => $subq) { $subq->start_attempt($this->get_substep($step, $i), $variant); } } public function apply_attempt_state(question_attempt_step $step) { foreach ($this->subquestions as $i => $subq) { $subq->apply_attempt_state($this->get_substep($step, $i)); } } public function get_question_summary() { $summary = $this->html_to_text($this->questiontext, $this->questiontextformat); foreach ($this->subquestions as $i => $subq) { switch ($subq->qtype->name()) { case 'multichoice': $choices = array(); $dummyqa = new question_attempt($subq, $this->contextid); foreach ($subq->get_order($dummyqa) as $ansid) { $choices[] = $this->html_to_text($subq->answers[$ansid]->answer, $subq->answers[$ansid]->answerformat); } $answerbit = '{' . implode('; ', $choices) . '}'; break; case 'numerical': case 'shortanswer': $answerbit = '_____'; break; default: $answerbit = '{ERR unknown sub-question type}'; } $summary = str_replace('{#' . $i . '}', $answerbit, $summary); } return $summary; } public function get_min_fraction() { $fractionsum = 0; $fractionmax = 0; foreach ($this->subquestions as $i => $subq) { $fractionmax += $subq->defaultmark; $fractionsum += $subq->defaultmark * $subq->get_min_fraction(); } return $fractionsum / $fractionmax; } public function get_max_fraction() { $fractionsum = 0; $fractionmax = 0; foreach ($this->subquestions as $i => $subq) { $fractionmax += $subq->defaultmark; $fractionsum += $subq->defaultmark * $subq->get_max_fraction(); } return $fractionsum / $fractionmax; } public function get_expected_data() { $expected = array(); foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); foreach ($subq->get_expected_data() as $name => $type) { if ($subq->qtype->name() == 'multichoice' && $subq->layout == qtype_multichoice_base::LAYOUT_DROPDOWN) { // Hack or MC inline does not work. $expected[$substep->add_prefix($name)] = PARAM_RAW; } else { $expected[$substep->add_prefix($name)] = $type; } } } return $expected; } public function get_correct_response() { $right = array(); foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); foreach ($subq->get_correct_response() as $name => $type) { $right[$substep->add_prefix($name)] = $type; } } return $right; } public function prepare_simulated_post_data($simulatedresponse) { $postdata = array(); foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); foreach ($subq->prepare_simulated_post_data($simulatedresponse[$i]) as $name => $value) { $postdata[$substep->add_prefix($name)] = $value; } } return $postdata; } public function get_student_response_values_for_simulation($postdata) { $simulatedresponse = array(); foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); $subqpostdata = $substep->filter_array($postdata); $subqsimulatedresponse = $subq->get_student_response_values_for_simulation($subqpostdata); foreach ($subqsimulatedresponse as $subresponsekey => $responsevalue) { $simulatedresponse[$i.'.'.$subresponsekey] = $responsevalue; } } ksort($simulatedresponse); return $simulatedresponse; } public function is_complete_response(array $response) { foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); if (!$subq->is_complete_response($substep->filter_array($response))) { return false; } } return true; } public function is_gradable_response(array $response) { foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); if ($subq->is_gradable_response($substep->filter_array($response))) { return true; } } return false; } public function is_same_response(array $prevresponse, array $newresponse) { foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); if (!$subq->is_same_response($substep->filter_array($prevresponse), $substep->filter_array($newresponse))) { return false; } } return true; } public function get_validation_error(array $response) { if ($this->is_complete_response($response)) { return ''; } return get_string('pleaseananswerallparts', 'qtype_multianswer'); } /** * Used by grade_response to combine the states of the subquestions. * The combined state is accumulates in $overallstate. That will be right * if all the separate states are right; and wrong if all the separate states * are wrong, otherwise, it will be partially right. * @param question_state $overallstate the result so far. * @param question_state $newstate the new state to add to the combination. * @return question_state the new combined state. */ protected function combine_states($overallstate, $newstate) { if (is_null($overallstate)) { return $newstate; } else if ($overallstate == question_state::$gaveup && $newstate == question_state::$gaveup) { return question_state::$gaveup; } else if ($overallstate == question_state::$gaveup && $newstate == question_state::$gradedwrong) { return question_state::$gradedwrong; } else if ($overallstate == question_state::$gradedwrong && $newstate == question_state::$gaveup) { return question_state::$gradedwrong; } else if ($overallstate == question_state::$gradedwrong && $newstate == question_state::$gradedwrong) { return question_state::$gradedwrong; } else if ($overallstate == question_state::$gradedright && $newstate == question_state::$gradedright) { return question_state::$gradedright; } else { return question_state::$gradedpartial; } } public function grade_response(array $response) { $overallstate = null; $fractionsum = 0; $fractionmax = 0; foreach ($this->subquestions as $i => $subq) { $fractionmax += $subq->defaultmark; $substep = $this->get_substep(null, $i); $subresp = $substep->filter_array($response); if (!$subq->is_gradable_response($subresp)) { $overallstate = $this->combine_states($overallstate, question_state::$gaveup); } else { list($subfraction, $newstate) = $subq->grade_response($subresp); $fractionsum += $subfraction * $subq->defaultmark; $overallstate = $this->combine_states($overallstate, $newstate); } } return array($fractionsum / $fractionmax, $overallstate); } public function clear_wrong_from_response(array $response) { foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); $subresp = $substep->filter_array($response); list($subfraction, $newstate) = $subq->grade_response($subresp); if ($newstate != question_state::$gradedright) { foreach ($subresp as $ind => $resp) { if ($subq->qtype == 'multichoice' && ($subq->layout == qtype_multichoice_base::LAYOUT_VERTICAL || $subq->layout == qtype_multichoice_base::LAYOUT_HORIZONTAL)) { $response[$substep->add_prefix($ind)] = '-1'; } else { $response[$substep->add_prefix($ind)] = ''; } } } } return $response; } public function get_num_parts_right(array $response) { $numright = 0; foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); $subresp = $substep->filter_array($response); list($subfraction, $newstate) = $subq->grade_response($subresp); if ($newstate == question_state::$gradedright) { $numright += 1; } } return array($numright, count($this->subquestions)); } public function compute_final_grade($responses, $totaltries) { $fractionsum = 0; $fractionmax = 0; foreach ($this->subquestions as $i => $subq) { $fractionmax += $subq->defaultmark; $lastresponse = array(); $lastchange = 0; $subfraction = 0; foreach ($responses as $responseindex => $response) { $substep = $this->get_substep(null, $i); $subresp = $substep->filter_array($response); if ($subq->is_same_response($lastresponse, $subresp)) { continue; } $lastresponse = $subresp; $lastchange = $responseindex; list($subfraction, $newstate) = $subq->grade_response($subresp); } $fractionsum += $subq->defaultmark * max(0, $subfraction - $lastchange * $this->penalty); } return $fractionsum / $fractionmax; } public function summarise_response(array $response) { $summary = array(); foreach ($this->subquestions as $i => $subq) { $substep = $this->get_substep(null, $i); $a = new stdClass(); $a->i = $i; $a->response = $subq->summarise_response($substep->filter_array($response)); $summary[] = get_string('subqresponse', 'qtype_multianswer', $a); } return implode('; ', $summary); } public function check_file_access($qa, $options, $component, $filearea, $args, $forcedownload) { if ($component == 'question' && $filearea == 'answer') { return true; } else if ($component == 'question' && $filearea == 'answerfeedback') { // Full logic to control which feedbacks a student can see is too complex. // Just allow access to all images. There is a theoretical chance the // students could see files they are not meant to see by guessing URLs, // but it is remote. return $options->feedback; } else if ($component == 'question' && $filearea == 'hint') { return $this->check_hint_file_access($qa, $options, $args); } else { return parent::check_file_access($qa, $options, $component, $filearea, $args, $forcedownload); } } }