public function GeshiFilterFilter::prepare in GeSHi Filter for syntax highlighting 8.2

Same name and namespace in other branches

1. 8 src/Plugin/Filter/GeshiFilterFilter.php \Drupal\geshifilter\Plugin\Filter\GeshiFilterFilter::prepare()

Prepares the text for processing.

Filters should not use the prepare method for anything other than escaping, because that would short-circuit the control the user has over the order in which filters are applied.

Parameters

string $text: The text string to be filtered.

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

Return value

string The prepared, escaped text.

Overrides FilterBase::prepare

File

src/Plugin/Filter/GeshiFilterFilter.php, line 131

Class

GeshiFilterFilter

Provides a base filter for Geshi Filter.

Namespace

Drupal\geshifilter\Plugin\Filter

Code

public function prepare($text, $langcode) {

  // Get the available tags.
  list($generic_code_tags, $language_tags, $tag_to_lang) = $this
    ->getTags();
  $tags = array_merge($generic_code_tags, $language_tags);

  // Escape special (regular expression) characters in tags (for tags like
  // 'c++' and 'c#').
  $tags = preg_replace('#(\\+|\\#)#', '\\\\$1', $tags);
  $tags_string = implode('|', $tags);

  // Pattern for matching "<code>...</code>" like stuff
  // Also matches "<code>...$"  where "$" refers to end of string, not end of
  // line (because PCRE_MULTILINE (modifier 'm') is not enabled), so matching
  // still works when teaser view trims inside the source code.
  // Replace the code container tag brackets
  // and prepare the container content (newline and angle bracket protection).
  // @todo: make sure that these replacements can be done in series.
  $tag_styles = array_filter($this
    ->tagStyles());
  if (in_array(GeshiFilter::BRACKETS_ANGLE, $tag_styles)) {

    // Prepare <foo>..</foo> blocks.
    $pattern = '#(<)(' . $tags_string . ')((\\s+[^>]*)*)(>)(.*?)(</\\2\\s*>|$)#s';
    $text = preg_replace_callback($pattern, [
      $this,
      'prepareCallback',
    ], $text);
  }
  if (in_array(GeshiFilter::BRACKETS_SQUARE, $tag_styles)) {

    // Prepare [foo]..[/foo] blocks.
    $pattern = '#((?<!\\[)\\[)(' . $tags_string . ')((\\s+[^\\]]*)*)(\\])(.*?)((?<!\\[)\\[/\\2\\s*\\]|$)#s';
    $text = preg_replace_callback($pattern, [
      $this,
      'prepareCallback',
    ], $text);
  }
  if (in_array(GeshiFilter::BRACKETS_DOUBLESQUARE, $tag_styles)) {

    // Prepare [[foo]]..[[/foo]] blocks.
    $pattern = '#(\\[\\[)(' . $tags_string . ')((\\s+[^\\]]*)*)(\\]\\])(.*?)(\\[\\[/\\2\\s*\\]\\]|$)#s';
    $text = preg_replace_callback($pattern, [
      $this,
      'prepareCallback',
    ], $text);
  }
  if (in_array(GeshiFilter::BRACKETS_PHPBLOCK, $tag_styles)) {

    // Prepare < ?php ... ? > blocks.
    $pattern = '#[\\[<](\\?php|\\?PHP|%)(.+?)((\\?|%)[\\]>]|$)#s';
    $text = preg_replace_callback($pattern, [
      $this,
      'preparePhpCallback',
    ], $text);
  }
  if (in_array(GeshiFilter::BRACKETS_MARKDOWNBLOCK, $tag_styles)) {

    // Prepare ```php ``` blocks(markdown).
    $pattern = '#(```([a-z]*)\\n([\\s\\S]*?)\\n```)#s';
    $text = preg_replace_callback($pattern, [
      $this,
      'prepareMarkdownCallback',
    ], $text);
  }
  return $text;
}