FilterHashtags.php in Hashtags 8

Namespace

Drupal\hashtags\Plugin\Filter

File

src/Plugin/Filter/FilterHashtags.php

<?php

namespace Drupal\hashtags\Plugin\Filter;

use Drupal\filter\Plugin\FilterBase;
use Drupal\filter\FilterProcessResult;
use Drupal\hashtags\Plugin\Filter\LinksConverter;

/**
 * @Filter(
 *   id = "filter_hashtags",
 *   title = @Translation("Hashtags Filter"),
 *   description = @Translation("Turn hashtags into links to corresponding terms"),
 *   type = Drupal\filter\Plugin\FilterInterface::TYPE_MARKUP_LANGUAGE,
 * )
 */
class FilterHashtags extends FilterBase {

  /**
   * Performs the filter processing.
   * @param string $text
   *   The text string to be filtered.
   * @param string $langcode
   *   The language code of the text to be filtered.
   * @return \Drupal\filter\FilterProcessResult
   *   The filtered text, wrapped in a FilterProcessResult object, and possibly
   *   with associated assets, cacheability metadata and placeholders.
   * @see \Drupal\filter\FilterProcessResult
   */
  public function process($text, $langcode) {
    $tids = _hashtags_get_tids_by_text($text);
    if (empty($tids)) {
      return new FilterProcessResult($text);
    }

    // create a class to pass parameters and have replace logic
    $replace_parameter = new LinksConverter($tids);

    // 1) 2+ character after #
    // 2) Don't start with or use only numbers (0-9) (#123abc, #123 etc)
    // 3) Letters - digits work correct (#abc123, #conference2013)
    // 4) No Special Characters “!, $, %, ^, &, *, +, .”
    // 5) No Spaces
    // 6) May use an underscore. Hyphens and dashes will not work.
    // 7) <p>#hashtag</p> - is valid
    // 8) <a href="#hashtag">Link</p> - is not valid
    // Bug when hashtag resides at the begining of the string
    $pattern = "/([\\s>]*?)(#)([[:alpha:]][[:alnum:]_]*[^<\\s[:punct:]])/iu";
    $text = preg_replace_callback($pattern, array(
      &$replace_parameter,
      'replace',
    ), $text);
    return new FilterProcessResult($text);
  }

}

Classes

Name	Description
FilterHashtags	Plugin annotation @Filter( id = "filter_hashtags", title = @Translation("Hashtags Filter"), description = @Translation("Turn hashtags into links to corresponding terms"), type = Drupal\filter\Plugin\FilterInterface::TYPE_MARKUP_LANGUAGE, )