FilterAlign.php in Drupal 8
File
core/modules/filter/src/Plugin/Filter/FilterAlign.php
View source
<?php
namespace Drupal\filter\Plugin\Filter;
use Drupal\Component\Utility\Html;
use Drupal\filter\FilterProcessResult;
use Drupal\filter\Plugin\FilterBase;
class FilterAlign extends FilterBase {
public function process($text, $langcode) {
$result = new FilterProcessResult($text);
if (stristr($text, 'data-align') !== FALSE) {
$dom = Html::load($text);
$xpath = new \DOMXPath($dom);
foreach ($xpath
->query('//*[@data-align]') as $node) {
$align = $node
->getAttribute('data-align');
$node
->removeAttribute('data-align');
if (in_array($align, [
'left',
'center',
'right',
])) {
$classes = $node
->getAttribute('class');
$classes = strlen($classes) > 0 ? explode(' ', $classes) : [];
$classes[] = 'align-' . $align;
$node
->setAttribute('class', implode(' ', $classes));
}
}
$result
->setProcessedText(Html::serialize($dom));
}
return $result;
}
public function tips($long = FALSE) {
if ($long) {
return $this
->t('
<p>You can align images, videos, blockquotes and so on to the left, right or center. Examples:</p>
<ul>
<li>Align an image to the left: <code><img src="" data-align="left" /></code></li>
<li>Align an image to the center: <code><img src="" data-align="center" /></code></li>
<li>Align an image to the right: <code><img src="" data-align="right" /></code></li>
<li>… and you can apply this to other elements as well: <code><video src="" data-align="center" /></code></li>
</ul>');
}
else {
return $this
->t('You can align images (<code>data-align="center"</code>), but also videos, blockquotes, and so on.');
}
}
}