function _gotwo_link in Go - url redirects 7

Process callback for the GO filter.

This function will load the text into a DOM object, search for <go> elements, saves non-existent href's and title's to the {gowto} table and replace the <go> tags with it's real <a> links. If defined in the <go> link the href is altered as requested. The full text with all links replaced is returned.

Parameters

$text: A raw text with all <go> links to be processed.

Return value

A raw text with all <go> links replaced with real <a> links.

1 string reference to '_gotwo_link'

gotwo_filter_info in ./gotwo.module

Implements hook_filter_info().

File

./gotwo.module, line 193

Module that provides easy to use redirection links. A redirection link would be like: http://examples.org/go/a_label http://examples.org/go/123546 http://examples.org/go/or/like/this

Code

function _gotwo_link($text, $filter) {
  $html_dom = filter_dom_load($text);
  $goNodesToRemove = array();
  foreach ($html_dom
    ->getElementsByTagName('go') as $goNode) {

    // Clone <go> link to <a> link and keep all attributes intact.
    $linkNode = $goNode->ownerDocument
      ->createElement('a');
    if ($goNode->attributes->length) {
      foreach ($goNode->attributes as $attribute) {
        $linkNode
          ->setAttribute($attribute->nodeName, $attribute->nodeValue);
      }
    }

    // Clone all <go> child nodes inside the new <a> tag.
    while ($goNode
      ->hasChildNodes()) {
      $childNodes = $goNode->childNodes;
      $linkNode
        ->appendChild($childNodes
        ->item(0));
    }

    // Verify if the url exists in the {gotwo} table. If the url is missing,
    // add the url with link title to the {gotwo} table.
    $href = $goNode
      ->getAttribute('href');
    $title = $goNode
      ->getAttribute('title');
    if (!empty($href)) {
      $linkNode
        ->setAttribute('href', _gotwo_get_url($href, empty($title) ? NULL : $title));
    }

    // Insert the new $linkNode before the previous $goNode.
    $goNode->parentNode
      ->insertBefore($linkNode, $goNode);

    // Save $goNode to remove array. We cannot remove the child here or the DOM
    // index will be cluttered and every second <go> link is not replacement.
    $goNodesToRemove[] = $goNode;
  }

  // Now we are able to remove the child's without loosing the index.
  foreach ($goNodesToRemove as $goNode) {
    $goNode->parentNode
      ->removeChild($goNode);
  }
  $text = filter_dom_serialize($html_dom);
  return trim($text);
}