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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  /**
  18   * Code highlighter filter.
  19   *
  20   * Filter converting text code into a well-styled block of code.
  21   *
  22   * @package    filter_codehighlighter
  23   * @copyright  2023 Meirza <meirza.arson@moodle.com>
  24   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25   */
  26  class filter_codehighlighter extends moodle_text_filter {
  27      /**
  28       * Apply the filter to the text
  29       *
  30       * @param string $text to be processed by the text
  31       * @param array $options filter options
  32       * @return string text after processing
  33       */
  34      public function filter($text, array $options = []): string {
  35          global $PAGE;
  36  
  37          if (!isset($options['originalformat'])) {
  38              return $text;
  39          }
  40  
  41          // The pattern.
  42          $re = '/<pre.+?class=".*?language-.*?"><code>/i';
  43  
  44          // Stops looking after the first match.
  45          preg_match($re, $text, $matches);
  46          if ($matches) {
  47              $PAGE->requires->js_call_amd('filter_codehighlighter/prism-init');
  48          }
  49  
  50          return $text;
  51      }
  52  }