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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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namespace tool_brickfield\local\htmlchecker\common;
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/**
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* Special base test class that deals with tests concerning the logical heirarchy of headers.
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*
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* @package tool_brickfield
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* @copyright 2020 onward: Brickfield Education Labs, www.brickfield.ie
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class brickfield_accessibility_header_test extends brickfield_accessibility_test {
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/** @var string The header tag this test applies to. */
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public $tag = '';
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/** @var array An array of all the header tags */
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public $headers = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];
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/**
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* The check method gathers all the headers together and walks through them, making sure that
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* the logical display of headers makes sense.
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*/
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public function check() {
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$firstheader = $this->dom->getElementsByTagName($this->tag);
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if ($firstheader->item(0)) {
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$current = $firstheader->item(0);
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$previousnumber = intval(substr($current->tagName, -1, 1));
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while ($current) {
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if (property_exists($current, 'tagName') && in_array($current->tagName, $this->headers)) {
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$currentnumber = intval(substr($current->tagName, -1, 1));
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if ($currentnumber > ($previousnumber + 1)) {
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$this->add_report($current);
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}
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$previousnumber = intval(substr($current->tagName, -1, 1));
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}
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$current = $current->nextSibling;
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}
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}
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}
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}
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