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renderer.php
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<?php
// This file is part of Moodle - https://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 <https://www.gnu.org/licenses/>.
/**
* Formulas question renderer class.
*
* @package qtype_formulas
* @copyright 2009 The Open University
* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
/**
* Base class for generating the bits of output for formulas questions.
*
* @copyright 2009 The Open University
* @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qtype_formulas_renderer extends qtype_with_combined_feedback_renderer {
/**
* Generate the display of the formulation part of the question. This is the
* area that contains the question text, and the controls for students to
* input their answers. Once the question is answered, it will contain the green tick
* or the red cross and the part's general / combined feedback.
*
* @param question_attempt $qa the question attempt to display.
* @param question_display_options $options controls what should and should not be displayed.
* @return ?string HTML fragment.
*/
public function formulation_and_controls(question_attempt $qa, question_display_options $options): ?string {
// First, fetch the instantiated question from the attempt.
/** @var qtype_formulas_question $question */
$question = $qa->get_question();
if (count($question->textfragments) !== $question->numparts + 1) {
$this->output->notification(get_string('error_question_damaged', 'qtype_formulas'), 'error');
return null;
}
$questiontext = '';
foreach ($question->parts as $part) {
$questiontext .= $question->format_text(
$question->textfragments[$part->partindex],
$question->questiontextformat,
$qa,
'question',
'questiontext',
$question->id,
false
);
$questiontext .= $this->part_formulation_and_controls($qa, $options, $part);
}
$questiontext .= $question->format_text(
$question->textfragments[$question->numparts],
$question->questiontextformat,
$qa,
'question',
'questiontext',
$question->id,
false
);
$result = html_writer::tag('div', $questiontext, ['class' => 'qtext']);
if ($qa->get_state() == question_state::$invalid) {
$result .= html_writer::nonempty_tag(
'div',
$question->get_validation_error($qa->get_last_qt_data()),
['class' => 'validationerror']
);
}
return $result;
}
/**
* Return HTML that needs to be included in the page's <head> when this
* question is used.
*
* @param question_attempt $qa question attempt that will be displayed on the page
* @return string HTML fragment
*/
public function head_code(question_attempt $qa) {
global $CFG;
$this->page->requires->js('/question/type/formulas/script/formatcheck.js');
// Include backwards-compatibility layer for Bootstrap 4 data attributes, if available.
// We may safely assume that if the uncompiled version is there, the minified one exists as well.
if (file_exists($CFG->dirroot . '/theme/boost/amd/src/bs4-compat.js')) {
$this->page->requires->js_call_amd('theme_boost/bs4-compat', 'init');
}
return '';
}
/**
* Return the part text, controls, grading details and feedbacks.
*
* @param question_attempt $qa question attempt that will be displayed on the page
* @param question_display_options $options
* @param qtype_formulas_part $part
* @return void
*/
public function part_formulation_and_controls(question_attempt $qa, question_display_options $options,
qtype_formulas_part $part) {
$partoptions = clone $options;
// If using adaptivemultipart behaviour, adjust feedback display options for this part.
if ($qa->get_behaviour_name() === 'adaptivemultipart') {
$qa->get_behaviour()->adjust_display_options_for_part($part->partindex, $partoptions);
}
$sub = $this->get_part_image_and_class($qa, $partoptions, $part);
$output = $this->get_part_formulation(
$qa,
$partoptions,
$part->partindex,
$sub
);
// Place for the right/wrong feeback image or appended at part's end.
// TODO: this is not documented anywhere.
if (strpos($output, '{_m}') !== false) {
$output = str_replace('{_m}', $sub->feedbackimage, $output);
} else {
$output .= $sub->feedbackimage;
}
$feedback = $this->part_combined_feedback($qa, $partoptions, $part, $sub->fraction);
$feedback .= $this->part_general_feedback($qa, $partoptions, $part);
// If one of the part's coordinates is a MC or select question, the correct answer
// stored in the database is not the right answer, but the index of the right answer,
// so in that case, we need to calculate the right answer.
if ($partoptions->rightanswer) {
$feedback .= $this->part_correct_response($part->partindex, $qa);
}
$output .= html_writer::nonempty_tag(
'div',
$feedback,
['class' => 'formulaspartoutcome']
);
return html_writer::tag('div', $output , ['class' => 'formulaspart']);
}
/**
* Return class and image for the part feedback.
*
* @param question_attempt $qa
* @param question_display_options $options
* @param qtype_formulas_part $part
* @return object
*/
public function get_part_image_and_class($qa, $options, $part) {
$question = $qa->get_question();
$sub = new StdClass;
$response = $qa->get_last_qt_data();
$response = $question->normalize_response($response);
list('answer' => $answergrade, 'unit' => $unitcorrect) = $part->grade($response);
$sub->fraction = $answergrade;
if ($unitcorrect === false) {
$sub->fraction *= (1 - $part->unitpenalty);
}
// Get the class and image for the feedback.
if ($options->correctness) {
$sub->feedbackimage = $this->feedback_image($sub->fraction);
$sub->feedbackclass = $this->feedback_class($sub->fraction);
if ($part->unitpenalty >= 1) { // All boxes must be correct at the same time, so they are of the same color.
$sub->unitfeedbackclass = $sub->feedbackclass;
$sub->boxfeedbackclass = $sub->feedbackclass;
} else { // Show individual color, all four color combinations are possible.
$sub->unitfeedbackclass = $this->feedback_class($unitcorrect);
$sub->boxfeedbackclass = $this->feedback_class($answergrade);
}
} else { // There should be no feedback if options->correctness is not set for this part.
$sub->feedbackimage = '';
$sub->feedbackclass = '';
$sub->unitfeedbackclass = '';
$sub->boxfeedbackclass = '';
}
return $sub;
}
/**
* Format given number according to numbering style, e. g. abc or 123.
*
* @param int $num number
* @param string $style style to render the number in, acccording to {@link qtype_multichoice::get_numbering_styles()}
* @return string number $num in the requested style
*/
protected function number_in_style($num, $style) {
switch ($style) {
case 'abc':
$number = chr(ord('a') + $num);
break;
case 'ABCD':
$number = chr(ord('A') + $num);
break;
case '123':
$number = $num + 1;
break;
case 'iii':
$number = question_utils::int_to_roman($num + 1);
break;
case 'IIII':
$number = strtoupper(question_utils::int_to_roman($num + 1));
break;
case 'none':
return '';
default:
// Default similar to none for compatibility with old questions.
return '';
}
return $number . '. ';
}
/**
* Return the part's text with variables replaced by their values.
*
* @param question_attempt $qa
* @param question_display_options $options
* @param int $i part index
* @param object $sub class and image for the part feedback
* @return string
*/
public function get_part_formulation(question_attempt $qa, question_display_options $options, $i, $sub) {
/** @var qype_formulas_question $question */
$question = $qa->get_question();
$part = &$question->parts[$i];
// Clone the part's evaluator and remove special variables like _0 etc., because they must
// not be substituted here; otherwise, we would lose input boxes.
$evaluator = clone $part->evaluator;
$evaluator->remove_special_vars();
$text = $evaluator->substitute_variables_in_text($part->subqtext);
$subqreplaced = $question->format_text($text,
$part->subqtextformat, $qa, 'qtype_formulas', 'answersubqtext', $part->id, false);
$types = [0 => 'number', 10 => 'numeric', 100 => 'numerical_formula', 1000 => 'algebraic_formula'];
$gradingtype = ($part->answertype != 10 && $part->answertype != 100 && $part->answertype != 1000) ? 0 : $part->answertype;
$gtype = $types[$gradingtype];
// Get the set of defined placeholders and their options.
$boxes = $part->scan_for_answer_boxes($subqreplaced);
// Append missing placholders at the end of part.
foreach (range(0, $part->numbox) as $j) {
$placeholder = ($j == $part->numbox) ? "_u" : "_$j";
if (!array_key_exists($placeholder, $boxes)) {
$boxes[$placeholder] = ['placeholder' => "{".$placeholder."}", 'options' => '', 'dropdown' => false];
$subqreplaced .= "{".$placeholder."}"; // Appended at the end.
}
}
// If part has combined unit answer input.
if ($part->has_combined_unit_field()) {
$variablename = "{$i}_";
$currentanswer = $qa->get_last_qt_var($variablename);
$inputname = $qa->get_qt_field_name($variablename);
$title = get_string($gtype . ($part->postunit == '' ? '' : '_unit'), 'qtype_formulas');
$inputattributes = [
'type' => 'text',
'name' => $inputname,
'data-toggle' => 'tooltip',
'data-title' => $title,
'title' => $title,
'value' => $currentanswer,
'id' => $inputname,
'class' => 'form-control formulas_' . $gtype . '_unit ' . $sub->feedbackclass,
'maxlength' => 128,
'aria-labelledby' => 'lbl_' . str_replace(':', '__', $inputname),
];
if ($options->readonly) {
$inputattributes['readonly'] = 'readonly';
}
// Create a meaningful label for accessibility.
$a = new stdClass();
$a->part = $i + 1;
$a->numanswer = '';
if ($question->numparts == 1) {
$label = get_string('answercombinedunitsingle', 'qtype_formulas', $a);
} else {
$label = get_string('answercombinedunitmulti', 'qtype_formulas', $a);
}
$input = html_writer::tag(
'label',
$label,
[
'class' => 'subq accesshide',
'for' => $inputattributes['id'],
'id' => 'lbl_' . str_replace(':', '__', $inputattributes['id']),
]
);
$input .= html_writer::empty_tag('input', $inputattributes);
$subqreplaced = str_replace("{_0}{_u}", $input, $subqreplaced);
}
// Get the set of string for each candidate input box {_0}, {_1}, ..., {_u}.
$inputs = [];
foreach (range(0, $part->numbox) as $j) { // Replace the input box for each placeholder {_0}, {_1} ...
$placeholder = ($j == $part->numbox) ? "_u" : "_$j"; // The last one is unit.
$variablename = "{$i}_$j";
$currentanswer = $qa->get_last_qt_var($variablename);
$inputname = $qa->get_qt_field_name($variablename);
$title = get_string($placeholder == '_u' ? 'unit' : $gtype, 'qtype_formulas');
$inputattributes = [
'name' => $inputname,
'value' => $currentanswer,
'id' => $inputname,
'data-toggle' => 'tooltip',
'data-title' => $title,
'title' => $title,
'maxlength' => 128,
'aria-labelledby' => 'lbl_' . str_replace(':', '__', $inputname),
];
if ($options->readonly) {
$inputattributes['readonly'] = 'readonly';
}
$stexts = null;
if (strlen($boxes[$placeholder]['options']) != 0) { // Then it's a multichoice answer..
try {
$stexts = $part->evaluator->export_single_variable($boxes[$placeholder]['options']);
} catch (Exception $e) {
// TODO: use non-capturing catch.
unset($e);
}
}
// Coordinate as multichoice options.
if ($stexts != null) {
if ($boxes[$placeholder]['dropdown']) {
// Select menu.
if ($options->readonly) {
$inputattributes['disabled'] = 'disabled';
}
$choices = [];
foreach ($stexts->value as $x => $mctxt) {
$choices[$x] = $question->format_text($mctxt, $part->subqtextformat , $qa,
'qtype_formulas', 'answersubqtext', $part->id, false);
}
unset($inputattributes['data-toggle']);
unset($inputattributes['data-title']);
$select = html_writer::select($choices, $inputname,
$currentanswer, ['' => ''], $inputattributes);
$output = html_writer::start_tag('span', ['class' => 'formulas_menu']);
$a = new stdClass();
$a->numanswer = $j + 1;
$a->part = $i + 1;
if (count($question->parts) > 1) {
$labeltext = get_string('answercoordinatemulti', 'qtype_formulas', $a);
} else {
$labeltext = get_string('answercoordinatesingle', 'qtype_formulas', $a);
}
$output .= html_writer::tag(
'label',
$labeltext,
[
'class' => 'subq accesshide',
'for' => $inputattributes['id'],
'id' => 'lbl_' . str_replace(':', '__', $inputattributes['id']),
]
);
$output .= $select;
$output .= html_writer::end_tag('span');
$inputs[$placeholder] = $output;
} else {
// Multichoice single question.
$inputattributes['type'] = 'radio';
if ($options->readonly) {
$inputattributes['disabled'] = 'disabled';
}
$output = $this->all_choices_wrapper_start();
foreach ($stexts->value as $x => $mctxt) {
$mctxt = html_writer::span($this->number_in_style($x, $question->answernumbering), 'answernumber')
. $question->format_text($mctxt, $part->subqtextformat , $qa,
'qtype_formulas', 'answersubqtext', $part->id, false);
$inputattributes['id'] = $inputname.'_'.$x;
$inputattributes['value'] = $x;
$inputattributes['aria-labelledby'] = 'lbl_' . str_replace(':', '__', $inputattributes['id']);
$isselected = ($currentanswer != '' && $x == $currentanswer);
$class = 'r' . ($x % 2);
if ($isselected) {
$inputattributes['checked'] = 'checked';
} else {
unset($inputattributes['checked']);
}
if ($options->correctness && $isselected) {
$class .= ' ' . $sub->feedbackclass;
}
$output .= $this->choice_wrapper_start($class);
unset($inputattributes['data-toggle']);
unset($inputattributes['data-title']);
$output .= html_writer::empty_tag('input', $inputattributes);
$output .= html_writer::tag(
'label',
$mctxt,
[
'for' => $inputattributes['id'],
'class' => 'm-l-1',
'id' => 'lbl_' . str_replace(':', '__', $inputattributes['id']),
]
);
$output .= $this->choice_wrapper_end();
}
$output .= $this->all_choices_wrapper_end();
$inputs[$placeholder] = $output;
}
continue;
}
// Coordinate as shortanswer question.
$inputs[$placeholder] = '';
$inputattributes['type'] = 'text';
if ($options->readonly) {
$inputattributes['readonly'] = 'readonly';
}
if ($j == $part->numbox) {
// Check if it's an input for unit.
if (strlen($part->postunit) > 0) {
$inputattributes['title'] = get_string('unit', 'qtype_formulas');
$inputattributes['class'] = 'form-control formulas_unit '.$sub->unitfeedbackclass;
$inputattributes['data-title'] = get_string('unit', 'qtype_formulas');
$inputattributes['data-toggle'] = 'tooltip';
$a = new stdClass();
$a->part = $i + 1;
$a->numanswer = $j + 1;
if ($question->numparts == 1) {
$label = get_string('answerunitsingle', 'qtype_formulas', $a);
} else {
$label = get_string('answerunitmulti', 'qtype_formulas', $a);
}
$inputs[$placeholder] = html_writer::tag(
'label',
$label,
[
'class' => 'subq accesshide',
'for' => $inputattributes['id'],
'id' => 'lbl_' . str_replace(':', '__', $inputattributes['id']),
]
);
$inputs[$placeholder] .= html_writer::empty_tag('input', $inputattributes);
}
} else {
$inputattributes['title'] = get_string($gtype, 'qtype_formulas');
$inputattributes['class'] = 'form-control formulas_'.$gtype.' '.$sub->boxfeedbackclass;
$inputattributes['data-toggle'] = 'tooltip';
$inputattributes['data-title'] = get_string($gtype, 'qtype_formulas');
$inputattributes['aria-labelledby'] = 'lbl_' . str_replace(':', '__', $inputattributes['id']);
$a = new stdClass();
$a->part = $i + 1;
$a->numanswer = $j + 1;
if ($part->numbox == 1) {
if ($question->numparts == 1) {
$label = get_string('answersingle', 'qtype_formulas', $a);
} else {
$label = get_string('answermulti', 'qtype_formulas', $a);
}
} else {
if ($question->numparts == 1) {
$label = get_string('answercoordinatesingle', 'qtype_formulas', $a);
} else {
$label = get_string('answercoordinatemulti', 'qtype_formulas', $a);
}
}
$inputs[$placeholder] = html_writer::tag(
'label',
$label,
[
'class' => 'subq accesshide',
'for' => $inputattributes['id'],
'id' => 'lbl_' . str_replace(':', '__', $inputattributes['id']),
]
);
$inputs[$placeholder] .= html_writer::empty_tag('input', $inputattributes);
}
}
foreach ($inputs as $placeholder => $replacement) {
$subqreplaced = preg_replace('/'.$boxes[$placeholder]['placeholder'].'/', $replacement, $subqreplaced, 1);
}
return $subqreplaced;
}
/**
* Generate HTML code to be included before each choice in multiple choice questions.
*
* @param string $class class attribute value
* @return string
*/
protected function choice_wrapper_start($class) {
return html_writer::start_tag('div', ['class' => $class]);
}
/**
* Generate HTML code to be included after each choice in multiple choice questions.
*
* @return string
*/
protected function choice_wrapper_end() {
return html_writer::end_tag('div');
}
/**
* Generate HTML code to be included before all choices in multiple choice questions.
*
* @return string
*/
protected function all_choices_wrapper_start() {
return html_writer::start_tag('div', ['class' => 'multichoice_answer']);
}
/**
* Generate HTML code to be included after all choices in multiple choice questions.
*
* @return string
*/
protected function all_choices_wrapper_end() {
return html_writer::end_tag('div');
}
/**
* Correct response for the question. This is not needed for the Formulas question, because
* answers are relative to parts.
*
* @param question_attempt $qa the question attempt to display
* @return string empty string
*/
public function correct_response(question_attempt $qa) {
return '';
}
/**
* Generate an automatic description of the correct response for a given part.
*
* @param int $i part index
* @param question_attempt $qa question attempt to display
* @return string HTML fragment
*/
public function part_correct_response($i, question_attempt $qa) {
/** @var qtype_formulas_question $question */
$question = $qa->get_question();
$answers = $question->parts[$i]->get_correct_response(true);
$answertext = implode(', ', $answers);
if ($question->parts[$i]->answernotunique) {
$string = 'correctansweris';
} else {
$string = 'uniquecorrectansweris';
}
return html_writer::nonempty_tag('div', get_string($string, 'qtype_formulas', $answertext),
['class' => 'formulaspartcorrectanswer']);
}
/**
* Generate a brief statement of how many sub-parts of this question the
* student got right.
* @param question_attempt $qa the question attempt to display.
* @return string HTML fragment.
*/
protected function num_parts_correct(question_attempt $qa) {
$response = $qa->get_last_qt_data();
if (!$qa->get_question()->is_gradable_response($response)) {
return '';
}
$numright = $qa->get_question()->get_num_parts_right($response);
if ($numright[0] === 1) {
return get_string('yougotoneright', 'qtype_formulas');
} else {
return get_string('yougotnright', 'qtype_formulas', $numright[0]);
}
}
/**
* We need to owerwrite this method to replace global variables by their value
* @param question_attempt $qa the question attempt to display.
* @return string HTML fragment.
*/
protected function hint(question_attempt $qa, question_hint $hint) {
/** @var qtype_formulas_question $question */
$question = $qa->get_question();
$hint->hint = $question->evaluator->substitute_variables_in_text($hint->hint);
return html_writer::nonempty_tag('div', $qa->get_question()->format_hint($hint, $qa), ['class' => 'hint']);
}
/**
* Generate HTML fragment for the question's combined feedback.
*
* @param question_attempt $qa question attempt being displayed
* @return string
*/
protected function combined_feedback(question_attempt $qa) {
$question = $qa->get_question();
$state = $qa->get_state();
if (!$state->is_finished()) {
$response = $qa->get_last_qt_data();
if (!$qa->get_question()->is_gradable_response($response)) {
return '';
}
list($notused, $state) = $qa->get_question()->grade_response($response);
}
$feedback = '';
$field = $state->get_feedback_class() . 'feedback';
$format = $state->get_feedback_class() . 'feedbackformat';
if ($question->$field) {
$feedback .= $question->format_text($question->$field, $question->$format,
$qa, 'question', $field, $question->id, false);
}
return $feedback;
}
/**
* Generate the specific feedback. This is feedback that varies according to
* the response the student gave.
*
* @param question_attempt $qa question attempt being displayed
* @return string
*/
public function specific_feedback(question_attempt $qa) {
return $this->combined_feedback($qa);
}
/**
* Gereate the part's general feedback. This is feedback is shown to all students.
*
* @param int $i part index
* @param question_attempt $qa question attempt being displayed
* @param question_definition $question question being displayed
* @param question_display_options $options controls what should and should not be displayed
* @return string HTML fragment
*/
protected function part_general_feedback(question_attempt $qa, question_display_options $options, $part) {
if ($part->feedback == '') {
return '';
}
$feedback = '';
$gradingdetails = '';
$question = $qa->get_question();
$state = $qa->get_state();
if ($qa->get_behaviour_name() == 'adaptivemultipart') {
// This is rather a hack, but it will probably work.
$renderer = $this->page->get_renderer('qbehaviour_adaptivemultipart');
$details = $qa->get_behaviour()->get_part_mark_details($part->partindex);
$gradingdetails = $renderer->render_adaptive_marks($details, $options);
$state = $details->state;
}
$showfeedback = $options->feedback && $state->get_feedback_class() != '';
if ($showfeedback) {
// Clone the part's evaluator and substitute local / grading vars first.
$evaluator = clone $part->evaluator;
$feedbacktext = $evaluator->substitute_variables_in_text($part->feedback);
$feedbacktext = $question->format_text(
$feedbacktext,
FORMAT_HTML,
$qa,
'qtype_formulas',
'answerfeedback',
$part->id,
false
);
$feedback = html_writer::tag('div', $feedbacktext , ['class' => 'feedback formulaslocalfeedback']);
return html_writer::nonempty_tag('div', $feedback . $gradingdetails,
['class' => 'formulaspartfeedback formulaspartfeedback-' . $part->partindex]);
}
return '';
}
/**
* Generate HTML fragment for the part's combined feedback.
*
* @param int $i part index
* @param question_attempt $qa question attempt being displayed
* @param question_definition $question question being displayed
* @param question_display_options $options controls what should and should not be displayed
* @return string HTML fragment
*/
protected function part_combined_feedback(question_attempt $qa, question_display_options $options, $part, $fraction) {
$feedback = '';
$showfeedback = false;
$gradingdetails = '';
$question = $qa->get_question();
$state = $qa->get_state();
$feedbackclass = $state->get_feedback_class();
if ($qa->get_behaviour_name() == 'adaptivemultipart') {
// This is rather a hack, but it will probably work.
$renderer = $this->page->get_renderer('qbehaviour_adaptivemultipart');
$details = $qa->get_behaviour()->get_part_mark_details($part->partindex);
$feedbackclass = $details->state->get_feedback_class();
} else {
$state = question_state::graded_state_for_fraction($fraction);
$feedbackclass = $state->get_feedback_class();
}
if ($feedbackclass != '') {
$showfeedback = $options->feedback;
$field = 'part' . $feedbackclass . 'fb';
$format = 'part' . $feedbackclass . 'fbformat';
if ($part->$field) {
// Clone the part's evaluator and substitute local / grading vars first.
$evaluator = clone $part->evaluator;
$part->$field = $evaluator->substitute_variables_in_text($part->$field);
$feedback = $question->format_text($part->$field, $part->$format,
$qa, 'qtype_formulas', $field, $part->id, false);
}
}
if ($showfeedback && $feedback) {
$feedback = html_writer::tag('div', $feedback , ['class' => 'feedback formulaslocalfeedback']);
return html_writer::nonempty_tag('div', $feedback,
['class' => 'formulaspartfeedback formulaspartfeedback-' . $part->partindex]);
}
return '';
}
}