public function FilterHashtags::process in Hashtags 8

Performs the filter processing.

Parameters

string $text: The text string to be filtered.

string $langcode: The language code of the text to be filtered.

Return value

\Drupal\filter\FilterProcessResult The filtered text, wrapped in a FilterProcessResult object, and possibly with associated assets, cacheability metadata and placeholders.

Overrides FilterInterface::process

File

src/Plugin/Filter/FilterHashtags.php, line 30

Class

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, )

Namespace

Drupal\hashtags\Plugin\Filter

Code

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);
}

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