protected function CssOptimizer::addDnsPrefetch in Advanced CSS/JS Aggregation 8.3

Same name and namespace in other branches

1. 8.4 src/Asset/CssOptimizer.php \Drupal\advagg\Asset\CssOptimizer::addDnsPrefetch()

Extract any domains to prefetch DNS.

Parameters

array $asset: A core asset definition array.

Return value

array An array of domains to prefetch.

Overrides AssetOptimizer::addDnsPrefetch

File

src/Asset/CssOptimizer.php, line 25

Class

CssOptimizer

The CSS Optimizer.

Namespace

Drupal\advagg\Asset

Code

protected function addDnsPrefetch(array $asset) {
  $prefetch = [];
  if (!isset($asset['contents'])) {
    return $prefetch;
  }
  $matches = [];
  $pattern = '%url\\(\\s*+[\'"]?+(http:\\/\\/|https:\\/\\/|\\/\\/)([^\'"()\\s]++)[\'"]?+\\s*+\\)%i';
  preg_match_all($pattern, $asset['contents'], $matches);
  if (!empty($matches[1])) {
    foreach ($matches[1] as $key => $match) {
      $parse = @parse_url($match . $matches[2][$key]);
      if (!empty($parse['host'])) {
        $prefetch[] = $parse['host'];
      }
    }
  }
  return $prefetch;
}