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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Upgrade library code for the multichoice question type.
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*
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* @package qtype
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* @subpackage multichoice
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* @copyright 2010 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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/**
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* Class for converting attempt data for multichoice questions when upgrading
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* attempts to the new question engine.
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*
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* This class is used by the code in question/engine/upgrade/upgradelib.php.
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*
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* @copyright 2010 The Open University
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class qtype_multichoice_qe2_attempt_updater extends question_qtype_attempt_updater {
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protected $order;
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public function is_blank_answer($state) {
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// Blank multichoice answers are not empty strings, they rather end in a colon.
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return empty($state->answer) || substr($state->answer, -1) == ':';
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}
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public function right_answer() {
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if ($this->question->options->single) {
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foreach ($this->question->options->answers as $ans) {
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if ($ans->fraction > 0.999) {
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return $this->to_text($ans->answer);
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}
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}
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} else {
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$rightbits = array();
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foreach ($this->question->options->answers as $ans) {
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if ($ans->fraction >= 0.000001) {
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$rightbits[] = $this->to_text($ans->answer);
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}
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}
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return implode('; ', $rightbits);
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}
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}
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protected function explode_answer($answer) {
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if (strpos($answer, ':') !== false) {
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list($order, $responses) = explode(':', $answer);
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return $responses;
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} else {
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// Sometimes, a bug means that a state is missing the <order>: bit,
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// We need to deal with that.
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$this->logger->log_assumption("Dealing with missing order information
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in attempt at multiple choice question {$this->question->id}");
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return $answer;
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}
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}
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public function response_summary($state) {
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$responses = $this->explode_answer($state->answer);
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if ($this->question->options->single) {
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if (is_numeric($responses)) {
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if (array_key_exists($responses, $this->question->options->answers)) {
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return $this->to_text($this->question->options->answers[$responses]->answer);
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} else {
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$this->logger->log_assumption("Dealing with a place where the
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student selected a choice that was later deleted for
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multiple choice question {$this->question->id}");
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return '[CHOICE THAT WAS LATER DELETED]';
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}
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} else {
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return null;
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}
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} else {
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if (!empty($responses)) {
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$responses = explode(',', $responses);
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$bits = array();
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foreach ($responses as $response) {
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if (array_key_exists($response, $this->question->options->answers)) {
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$bits[] = $this->to_text(
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$this->question->options->answers[$response]->answer);
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} else {
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$this->logger->log_assumption("Dealing with a place where the
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student selected a choice that was later deleted for
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multiple choice question {$this->question->id}");
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$bits[] = '[CHOICE THAT WAS LATER DELETED]';
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}
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}
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return implode('; ', $bits);
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} else {
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return null;
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}
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}
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}
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public function was_answered($state) {
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$responses = $this->explode_answer($state->answer);
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if ($this->question->options->single) {
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return is_numeric($responses);
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} else {
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return !empty($responses);
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}
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}
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public function set_first_step_data_elements($state, &$data) {
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if (!$state->answer) {
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return;
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}
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list($order, $responses) = explode(':', $state->answer);
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$data['_order'] = $order;
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$this->order = explode(',', $order);
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}
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public function supply_missing_first_step_data(&$data) {
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$data['_order'] = implode(',', array_keys($this->question->options->answers));
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}
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public function set_data_elements_for_step($state, &$data) {
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$responses = $this->explode_answer($state->answer);
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if ($this->question->options->single) {
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if (is_numeric($responses)) {
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$flippedorder = array_combine(array_values($this->order), array_keys($this->order));
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if (array_key_exists($responses, $flippedorder)) {
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$data['answer'] = $flippedorder[$responses];
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} else {
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$data['answer'] = '-1';
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}
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}
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} else {
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$responses = explode(',', $responses);
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foreach ($this->order as $key => $ansid) {
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if (in_array($ansid, $responses)) {
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$data['choice' . $key] = 1;
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} else {
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$data['choice' . $key] = 0;
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}
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}
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}
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}
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}
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