renderer.php

<?php
// This file is part of Stack - http://stack.maths.ed.ac.uk/
//
// Stack 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.
//
// Stack 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 Stack.  If not, see <http://www.gnu.org/licenses/>.

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

/**
 * Stack question renderer class.
 *
 * @package   qtype_stack
 * @copyright 2012 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once(__DIR__ . '/vle_specific.php');

/**
 * Generates the output for Stack questions.
 *
 * @copyright 2012 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
// @codingStandardsIgnoreStart
// There's a matching class name in the API.
class qtype_stack_renderer extends qtype_renderer {
// @codingStandardsIgnoreEnd

    public function formulation_and_controls(question_attempt $qa, question_display_options $options) {
        /* Return type should be @var qtype_stack_question $question. */
        $question = $qa->get_question();

        $response = $qa->get_last_qt_data();

        // We need to provide a processor for the CASText2 post-processing,
        // basically for targetting pluginfiles.
        $question->castextprocessor = new castext2_qa_processor($qa);

        if (is_string($question->questiontextinstantiated)) {
            // The question has not been instantiated successfully, at this level it is likely
            // a failure at compilation and that means invalid teacher code.
            return $question->questiontextinstantiated;
        }

        $questiontext = $question->questiontextinstantiated->get_rendered($question->castextprocessor);

        // Replace inputs.
        $inputstovaldiate = [];

        // Get the list of placeholders before format_text.
        $originalinputplaceholders = array_unique(stack_utils::extract_placeholders($questiontext, 'input'));
        sort($originalinputplaceholders);
        $originalfeedbackplaceholders = array_unique(stack_utils::extract_placeholders($questiontext, 'feedback'));
        sort($originalfeedbackplaceholders);

        // Now format the questiontext.
        $questiontext = $question->format_text(
                stack_maths::process_display_castext($questiontext, $this),
                FORMAT_HTML, // All CASText2 processed content has already been formatted to HTML.