Proyectos de Subversion Moodle

<?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/>.

/**

 * Upgrade library code for the multianswer question type.

 *

 * @package    qtype

 * @subpackage multianswer

 * @copyright  2011 The Open University

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

defined('MOODLE_INTERNAL') || die();

/**

 * Class for converting attempt data for multianswer questions when upgrading

 * attempts to the new question engine.

 *

 * This class is used by the code in question/engine/upgrade/upgradelib.php.

 *

 * @copyright  2011 The Open University

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class qtype_multianswer_qe2_attempt_updater extends question_qtype_attempt_updater {

    public function question_summary() {

        $summary = $this->to_text($this->question->questiontext);

        foreach ($this->question->options->questions as $i => $subq) {

            switch ($subq->qtype) {

                case 'multichoice':

                    $choices = array();

                    foreach ($subq->options->answers as $ans) {

                        $choices[] = $this->to_text($ans->answer);

                    }

                    $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 right_answer() {

        $right = array();

        foreach ($this->question->options->questions as $i => $subq) {

            foreach ($subq->options->answers as $ans) {

                if ($ans->fraction > 0.999) {

                    $right[$i] = $ans->answer;

                    break;

                }

            }

        }

        return $this->display_response($right);

    }

    public function explode_answer($answer) {

        $response = array();

        foreach (explode(',', $answer) as $part) {

            list($index, $partanswer) = explode('-', $part, 2);

            $response[$index] = str_replace(

                    array(',', '-'), array(",", "-"), $partanswer);

        }

        return $response;

    }

    public function display_response($response) {

        $summary = array();

        foreach ($this->question->options->questions as $i => $subq) {

            $a = new stdClass();

            $a->i = $i;

            $a->response = $this->to_text($response[$i]);

            $summary[] = get_string('subqresponse', 'qtype_multianswer', $a);

        }

        return implode('; ', $summary);

    }

    public function response_summary($state) {

        $response = $this->explode_answer($state->answer);

        foreach ($this->question->options->questions as $i => $subq) {

            if ($response[$i] && $subq->qtype == 'multichoice') {

                $response[$i] = $subq->options->answers[$response[$i]]->answer;

            }

        }

        return $this->display_response($response);

    }

    public function was_answered($state) {

        return !empty($state->answer);

    }

    public function set_first_step_data_elements($state, &$data) {

        foreach ($this->question->options->questions as $i => $subq) {

            switch ($subq->qtype) {

                case 'multichoice':

                    $data[$this->add_prefix('_order', $i)] =

                            implode(',', array_keys($subq->options->answers));

                    break;

                case 'numerical':

                    $data[$this->add_prefix('_separators', $i)] = '.$,';

                    break;

            }

        }

    }

    public function supply_missing_first_step_data(&$data) {

    }

    public function set_data_elements_for_step($state, &$data) {

        $response = $this->explode_answer($state->answer);

        foreach ($this->question->options->questions as $i => $subq) {

            if (empty($response[$i])) {

                continue;

            }

            switch ($subq->qtype) {

                case 'multichoice':

                    $choices = array();

                    $order = 0;

                    foreach ($subq->options->answers as $ans) {

                        if ($ans->id == $response[$i]) {

                            $data[$this->add_prefix('answer', $i)] = $order;

                        }

                        $order++;

                    }

                    $answerbit = '{' . implode('; ', $choices) . '}';

                    break;

                case 'numerical':

                case 'shortanswer':

                    $data[$this->add_prefix('answer', $i)] = $response[$i];

                    break;

            }

        }

    }

    public function add_prefix($field, $i) {

        $prefix = 'sub' . $i . '_';

        if (substr($field, 0, 2) === '!_') {

            return '-_' . $prefix . substr($field, 2);

        } else if (substr($field, 0, 1) === '-') {

            return '-' . $prefix . substr($field, 1);

        } else if (substr($field, 0, 1) === '_') {

            return '_' . $prefix . substr($field, 1);

        } else {

            return $prefix . $field;

        }

    }

}