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<?php
namespace Drupal\Core\Asset;
use Drupal\Component\Utility\Unicode;
/**
* Optimizes a JavaScript asset.
*/
class JsOptimizer implements AssetOptimizerInterface {
/**
* {@inheritdoc}
*/
public function optimize(array $js_asset) {
if ($js_asset['type'] !== 'file') {
throw new \Exception('Only file JavaScript assets can be optimized.');
}
if (!$js_asset['preprocess']) {
throw new \Exception('Only file JavaScript assets with preprocessing enabled can be optimized.');
}
// If a BOM is found, convert the file to UTF-8, then use substr() to
// remove the BOM from the result.
$data = file_get_contents($js_asset['data']);
if ($encoding = (Unicode::encodingFromBOM($data))) {
$data = Unicode::substr(Unicode::convertToUtf8($data, $encoding), 1);
}
// If no BOM is found, check for the charset attribute.
elseif (isset($js_asset['attributes']['charset'])) {
$data = Unicode::convertToUtf8($data, $js_asset['attributes']['charset']);
}
// No-op optimizer: no optimizations are applied to JavaScript assets.
return $data;
}
/**
* Processes the contents of a javascript asset for cleanup.
*
* @param string $contents
* The contents of the javascript asset.
*
* @return string
* Contents of the javascript asset.
*/
public function clean($contents) {
// Remove JS source and source mapping urls or these may cause 404 errors.
$contents = preg_replace('/\/\/(#|@)\s(sourceURL|sourceMappingURL)=\s*(\S*?)\s*$/m', '', $contents);
return $contents;
}
}