public static function Html::escapeCdataElement

Adds comments around a <!CDATA section in a \DOMNode.

\DOMDocument::loadHTML() in \Drupal\Component\Utility\Html::load() makes CDATA sections from the contents of inline script and style tags. This can cause HTML4 browsers to throw exceptions.

This function attempts to solve the problem by creating a \DOMDocumentFragment to comment the CDATA tag.

Parameters

\DOMNode $node: The element potentially containing a CDATA node.

string $comment_start: (optional) A string to use as a comment start marker to escape the CDATA declaration. Defaults to '//'.

string $comment_end: (optional) A string to use as a comment end marker to escape the CDATA declaration. Defaults to an empty string.

File

core/lib/Drupal/Component/Utility/Html.php, line 345

Class

Html

Provides DOMDocument helpers for parsing and serializing HTML strings.

Namespace

Code

public static function escapeCdataElement(\DOMNode $node, $comment_start = '//', $comment_end = '') {
  foreach ($node->childNodes as $child_node) {
    if ($child_node instanceof \DOMCdataSection) {
      $embed_prefix = "\n<!--{$comment_start}--><![CDATA[{$comment_start} ><!--{$comment_end}\n";
      $embed_suffix = "\n{$comment_start}--><!]]>{$comment_end}\n";

      // Prevent invalid cdata escaping as this would throw a DOM error.
      // This is the same behavior as found in libxml2.
      // Related W3C standard: http://www.w3.org/TR/REC-xml/#dt-cdsection
      // Fix explanation: http://wikipedia.org/wiki/CDATA#Nesting
      $data = str_replace(']]>', ']]]]><![CDATA[>', $child_node->data);
      $fragment = $node->ownerDocument
        ->createDocumentFragment();
      $fragment
        ->appendXML($embed_prefix . $data . $embed_suffix);
      $node
        ->appendChild($fragment);
      $node
        ->removeChild($child_node);
    }
  }
}