public static function FilterHtml::mergeAllowedTags in Markdown 8.2

Merges allowed HTML tags.

Parameters

array $normalizedTags: An existing normalized allowed HTML tags array.

array ...$tags: One or more arrays of allowed HTML tags to merge onto $normalizedTags.

Return value

array The merged $normalizedTags.

2 calls to FilterHtml::mergeAllowedTags()

FilterHtml::getHTMLRestrictions in src/Util/FilterHtml.php

Returns HTML allowed by this filter's configuration.

Parsedown::allowedHtmlTags in src/Plugin/Markdown/Parsedown/Parsedown.php

Retrieves the allowed HTML tags.

File

src/Util/FilterHtml.php, line 68

Class

FilterHtml

Extends FilterHtml to allow more more permissive global attributes.

Namespace

Drupal\markdown\Util

Code

public static function mergeAllowedTags(array $normalizedTags, array $tags) {
  $args = func_get_args();
  $normalizedTags = array_shift($args);
  foreach ($args as $tags) {
    if (!is_array($tags) || !$tags) {
      continue;
    }

    // Normalize the tags to merge.
    $tags = static::normalizeTags($tags);
    foreach ($tags as $tag => $attributes) {

      // Add tag if it doesn't already exist.
      if (!isset($normalizedTags[$tag])) {
        $normalizedTags[$tag] = $attributes;
        continue;
      }

      // Existing tag already allows all attributes, skip merge.
      if (!empty($normalizedTags[$tag]['*'])) {
        continue;
      }

      // New tag allows all attributes, replace existing tag.
      if (!empty($attributes['*'])) {
        $normalizedTags[$tag] = [
          '*' => TRUE,
        ];
        continue;
      }

      // Now merge in individual attributes from tag.
      foreach ($attributes as $name => $value) {

        // Add attribute if it doesn't already exist.
        if (!isset($normalizedTags[$tag][$name])) {
          $normalizedTags[$tag][$name] = $value;
          continue;
        }

        // Existing tag attribute already allows all values, skip merge.
        if ($normalizedTags[$tag][$name] === TRUE) {
          continue;
        }

        // New tag attribute allows all values, replace existing attribute.
        if ($value === TRUE) {
          $normalizedTags[$tag][$name] = $value;
          continue;
        }

        // Finally, if specific attribute values are specified, merge them.
        if (is_array($value)) {
          if (!is_array($normalizedTags[$tag][$name])) {
            $normalizedTags[$tag][$name] = [];
          }
          $normalizedTags[$tag][$name] = array_replace($normalizedTags[$tag][$name], $value);
        }
      }
    }
  }
  ksort($normalizedTags);
  return $normalizedTags;
}