public function ReadmehelpMarkdown::convertLeadingHash in README Help 8

Wraps lines preceded with up to 6 "#" + " " text lines into h1-6 tag.

The single "# " can be used just once at the very beginning of a text. Other hash signs + space sets can be used multiple times in a text. Additionally, "#" sign turns into anchor link, so the heading can be used as a local or external link target.

Parameters

string $text: The string to be filtered.

Return value

string The HTML source with headings.

1 call to ReadmehelpMarkdown::convertLeadingHash()

ReadmehelpMarkdown::process in src/Plugin/Filter/ReadmehelpMarkdown.php

Performs the filter processing.

File

src/Plugin/Filter/ReadmehelpMarkdown.php, line 365

Class

ReadmehelpMarkdown

Provides a filter for markdown.

Namespace

Drupal\readmehelp\Plugin\Filter

Code

public function convertLeadingHash($text) {
  foreach (range(1, 6) as $i) {
    $hash = str_pad('#', $i, "#");
    $j = $i > 1 ? '\\n' . $hash : '^' . $hash;
    $text = preg_replace_callback('/' . $j . '(\\s+\\w.*?)\\n/', function ($matches) use ($i) {
      if ($match = !empty($matches[1]) ? rtrim($matches[1]) : '') {
        $id = trim(Html::getUniqueId($match), '-');
        $match = "<h{$i} class=\"h-{$i}\"><a id=\"{$id}\" href=\"#{$id}\" class=\"anchor\">#</a>{$match}</h{$i}>";
      }
      return $match;
    }, $text);
  }
  return $text;
}