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✏️ Editing: img_alt_not_empty_in_anchor.php

<?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/>.

namespace tool_brickfield\local\htmlchecker\common\checks;

use tool_brickfield\local\htmlchecker\common\brickfield_accessibility_test;

/**
 * Brickfield accessibility HTML checker library.
 *
 * Alt text for all img elements used as source anchors is not empty when there is no other text in the anchor.
 * img element cannot have alt attribute value of null or whitespace if the img element is contained by an
 * a element and there is no other link text.
 *
 * @package    tool_brickfield
 * @copyright  2020 onward: Brickfield Education Labs, www.brickfield.ie
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class img_alt_not_empty_in_anchor extends brickfield_accessibility_test {

/** @var int The default severity code for this test. */
    public $defaultseverity = \tool_brickfield\local\htmlchecker\brickfield_accessibility::BA_TEST_SEVERE;

/**
     * The main check function. This is called by the parent class to actually check content
     */
    public function check(): void {
        foreach ($this->get_all_elements('a') as $a) {
            if (!$a->nodeValue && $a->childNodes) {
                foreach ($a->childNodes as $child) {
                    if ($this->property_is_equal($child, 'tagName', 'img')
                        && trim($child->getAttribute('alt')) == '') {
                        $this->add_report($child);
                    }
                }
            }
        }
    }
}

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