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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  namespace tool_brickfield\local\htmlchecker\common\checks;
  18  
  19  use tool_brickfield\local\htmlchecker\common\brickfield_accessibility_test;
  20  
  21  /**
  22   * Brickfield accessibility HTML checker library.
  23   *
  24   * Alt text is not the same as the filename unless author has confirmed it is correct.
  25   * 'img' element cannot have alt attribute value that is the same as its src attribute.
  26   *
  27   * @package    tool_brickfield
  28   * @copyright  2020 onward: Brickfield Education Labs, www.brickfield.ie
  29   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  30   */
  31  class img_alt_is_different extends brickfield_accessibility_test {
  32  
  33      /** @var int The default severity code for this test. */
  34      public $defaultseverity = \tool_brickfield\local\htmlchecker\brickfield_accessibility::BA_TEST_SEVERE;
  35  
  36      /**
  37       * The main check function. This is called by the parent class to actually check content
  38       */
  39      public function check(): void {
  40          foreach ($this->get_all_elements('img') as $img) {
  41              if (trim($img->getAttribute('src')) == trim($img->getAttribute('alt'))) {
  42                  $this->add_report($img);
  43              } else if (preg_match("/.jpg|.JPG|.png|.PNG|.gif|.GIF|.jpeg|.JPEG$/", trim($img->getAttribute('alt')))) {
  44                  $this->add_report($img);
  45              }
  46          }
  47      }
  48  }