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/>.

/**

 * Question behaviour for the old adaptive mode.

 *

 * @package    qbehaviour

 * @subpackage adaptive

 * @copyright  2009 The Open University

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

 */

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

/**

 * Question behaviour for adaptive mode.

 *

 * This is the old version of interactive mode.

 *

 * @copyright  2009 The Open University

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

 */

class qbehaviour_adaptive extends question_behaviour_with_multiple_tries {

    const IS_ARCHETYPAL = true;

    public function is_compatible_question(question_definition $question) {

        return $question instanceof question_automatically_gradable;

    }

    public function get_expected_data() {

        if ($this->qa->get_state()->is_active()) {

            return array('submit' => PARAM_BOOL);

        }

        return parent::get_expected_data();

    }

    public function get_state_string($showcorrectness) {

        $laststep = $this->qa->get_last_step();

        if ($laststep->has_behaviour_var('_try')) {

            $state = question_state::graded_state_for_fraction(

                    $laststep->get_behaviour_var('_rawfraction'));

            return $state->default_string(true);

        }

        $state = $this->qa->get_state();

        if ($state == question_state::$todo) {

            return get_string('notcomplete', 'qbehaviour_adaptive');

        } else {

            return parent::get_state_string($showcorrectness);

        }

    }

    public function get_right_answer_summary() {

        return $this->question->get_right_answer_summary();

    }

    public function adjust_display_options(question_display_options $options) {

        // Save some bits so we can put them back later.

        $save = clone($options);

        // Do the default thing.

        parent::adjust_display_options($options);

        // Then, if they have just Checked an answer, show them the applicable bits of feedback.

        if (!$this->qa->get_state()->is_finished() &&

                $this->qa->get_last_behaviour_var('_try')) {

            $options->feedback        = $save->feedback;

            $options->correctness     = $save->correctness;

            $options->numpartscorrect = $save->numpartscorrect;

        }

    }

    public function process_action(question_attempt_pending_step $pendingstep) {

        if ($pendingstep->has_behaviour_var('comment')) {

            return $this->process_comment($pendingstep);

        } else if ($pendingstep->has_behaviour_var('finish')) {

            return $this->process_finish($pendingstep);

        } else if ($pendingstep->has_behaviour_var('submit')) {

            return $this->process_submit($pendingstep);

        } else {

            return $this->process_save($pendingstep);

        }

    }

    public function summarise_action(question_attempt_step $step) {

        if ($step->has_behaviour_var('comment')) {

            return $this->summarise_manual_comment($step);

        } else if ($step->has_behaviour_var('finish')) {

            return $this->summarise_finish($step);

        } else if ($step->has_behaviour_var('submit')) {

            return $this->summarise_submit($step);

        } else {

            return $this->summarise_save($step);

        }

    }

    public function process_save(question_attempt_pending_step $pendingstep) {

        $status = parent::process_save($pendingstep);

        $prevgrade = $this->qa->get_fraction();

        if (!is_null($prevgrade)) {

            $pendingstep->set_fraction($prevgrade);

        }

        $pendingstep->set_state(question_state::$todo);

        return $status;

    }

    protected function adjusted_fraction($fraction, $prevtries) {

        return $fraction - $this->question->penalty * $prevtries;

    }

    public function process_submit(question_attempt_pending_step $pendingstep) {

        $status = $this->process_save($pendingstep);

        $response = $pendingstep->get_qt_data();

        if (!$this->question->is_complete_response($response)) {

            $pendingstep->set_state(question_state::$invalid);

            if ($this->qa->get_state() != question_state::$invalid) {

                $status = question_attempt::KEEP;

            }

            return $status;

        }

        $prevstep = $this->qa->get_last_step_with_behaviour_var('_try');

        $prevresponse = $prevstep->get_qt_data();

        $prevtries = $this->qa->get_last_behaviour_var('_try', 0);

        $prevbest = $pendingstep->get_fraction();

        if (is_null($prevbest)) {

            $prevbest = 0;

        }

        if ($this->question->is_same_response($response, $prevresponse)) {

            return question_attempt::DISCARD;

        }

        list($fraction, $state) = $this->question->grade_response($response);

        $pendingstep->set_fraction(max($prevbest, $this->adjusted_fraction($fraction, $prevtries)));

        if ($prevstep->get_state() == question_state::$complete) {

            $pendingstep->set_state(question_state::$complete);

        } else if ($state == question_state::$gradedright) {

            $pendingstep->set_state(question_state::$complete);

        } else {

            $pendingstep->set_state(question_state::$todo);

        }

        $pendingstep->set_behaviour_var('_try', $prevtries + 1);

        $pendingstep->set_behaviour_var('_rawfraction', $fraction);

        $pendingstep->set_new_response_summary($this->question->summarise_response($response));

        return question_attempt::KEEP;

    }

    public function process_finish(question_attempt_pending_step $pendingstep) {

        if ($this->qa->get_state()->is_finished()) {

            return question_attempt::DISCARD;

        }

        $prevtries = $this->qa->get_last_behaviour_var('_try', 0);

        $prevbest = $this->qa->get_fraction();

        if (is_null($prevbest)) {

            $prevbest = 0;

        }

        $laststep = $this->qa->get_last_step();

        $response = $laststep->get_qt_data();

        if (!$this->question->is_gradable_response($response)) {

            $state = question_state::$gaveup;

            $fraction = 0;

        } else {

            if ($laststep->has_behaviour_var('_try')) {

                // Last answer was graded, we want to regrade it. Otherwise the answer

                // has changed, and we are grading a new try.

                $prevtries -= 1;

            }

            list($fraction, $state) = $this->question->grade_response($response);

            $pendingstep->set_behaviour_var('_try', $prevtries + 1);

            $pendingstep->set_behaviour_var('_rawfraction', $fraction);

            $pendingstep->set_new_response_summary($this->question->summarise_response($response));

        }

        $pendingstep->set_state($state);

        $pendingstep->set_fraction(max($prevbest, $this->adjusted_fraction($fraction, $prevtries)));

        return question_attempt::KEEP;

    }

    /**

     * Got the most recently graded step. This is mainly intended for use by the

     * renderer.

     * @return question_attempt_step the most recently graded step.

     */

    public function get_graded_step() {

        $step = $this->qa->get_last_step_with_behaviour_var('_try');

        if ($step->has_behaviour_var('_try')) {

            return $step;

        } else {

            return null;

        }

    }

    /**

     * Determine whether a question state represents an "improvable" result,

     * that is, whether the user can still improve their score.

     *

     * @param question_state $state the question state.

     * @return bool whether the state is improvable

     */

    public function is_state_improvable(question_state $state) {

        return $state == question_state::$todo;

    }

    /**

     * @return qbehaviour_adaptive_mark_details the information about the current state-of-play, scoring-wise,

     * for this adaptive attempt.

     */

    public function get_adaptive_marks() {

        // Try to find the last graded step.

        $gradedstep = $this->get_graded_step();

        if (is_null($gradedstep) || $this->qa->get_max_mark() == 0) {

            // No score yet.

            return new qbehaviour_adaptive_mark_details(question_state::$todo);

        }

        // Work out the applicable state.

        if ($this->qa->get_state()->is_commented()) {

            $state = $this->qa->get_state();

        } else {

            $state = question_state::graded_state_for_fraction(

                                $gradedstep->get_behaviour_var('_rawfraction'));

        }

        // Prepare the grading details.

        $details = $this->adaptive_mark_details_from_step($gradedstep, $state, $this->qa->get_max_mark(), $this->question->penalty);

        $details->improvable = $this->is_state_improvable($this->qa->get_state());

        return $details;

    }

    /**

     * Actually populate the qbehaviour_adaptive_mark_details object.

     * @param question_attempt_step $gradedstep the step that holds the relevant mark details.

     * @param question_state $state the state corresponding to $gradedstep.

     * @param unknown_type $maxmark the maximum mark for this question_attempt.

     * @param unknown_type $penalty the penalty for this question, as a fraction.

     */

    protected function adaptive_mark_details_from_step(question_attempt_step $gradedstep,

            question_state $state, $maxmark, $penalty) {

        $details = new qbehaviour_adaptive_mark_details($state);

        $details->maxmark    = $maxmark;

        $details->actualmark = $gradedstep->get_fraction() * $details->maxmark;

        $details->rawmark    = $gradedstep->get_behaviour_var('_rawfraction') * $details->maxmark;

        $details->currentpenalty = $penalty * $details->maxmark;

        $details->totalpenalty   = $details->currentpenalty * $this->qa->get_last_behaviour_var('_try', 0);

        $details->improvable = $this->is_state_improvable($gradedstep->get_state());

        return $details;

    }

}

/**

 * This class encapsulates all the information about the current state-of-play

 * scoring-wise. It is used to communicate between the beahviour and the renderer.

 *

 * @copyright  2012 The Open University

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

 */

class qbehaviour_adaptive_mark_details {

    /** @var question_state the current state of the question. */

    public $state;

    /** @var float the maximum mark for this question. */

    public $maxmark;

    /** @var float the current mark for this question. */

    public $actualmark;

    /** @var float the raw mark for this question before penalties were applied. */

    public $rawmark;

    /** @var float the the amount of additional penalty this attempt attracted. */

    public $currentpenalty;

    /** @var float the total that will apply to future attempts. */

    public $totalpenalty;

    /** @var bool whether it is possible for this mark to be improved in future. */

    public $improvable;

    /**

     * Constructor.

     * @param question_state $state

     */

    public function __construct($state, $maxmark = null, $actualmark = null, $rawmark = null,

            $currentpenalty = null, $totalpenalty = null, $improvable = null) {

        $this->state          = $state;

        $this->maxmark        = $maxmark;

        $this->actualmark     = $actualmark;

        $this->rawmark        = $rawmark;

        $this->currentpenalty = $currentpenalty;

        $this->totalpenalty   = $totalpenalty;

        $this->improvable     = $improvable;

    }

    /**

     * Get the marks, formatted to a certain number of decimal places, in the

     * form required by calls like get_string('gradingdetails', 'qbehaviour_adaptive', $a).

     * @param int $markdp the number of decimal places required.

     * @return array ready to substitute into language strings.

     */

    public function get_formatted_marks($markdp) {

        return array(

            'max'          => format_float($this->maxmark,        $markdp),

            'cur'          => format_float($this->actualmark,     $markdp),

            'raw'          => format_float($this->rawmark,        $markdp),

            'penalty'      => format_float($this->currentpenalty, $markdp),

            'totalpenalty' => format_float($this->totalpenalty,   $markdp),

        );

    }

}