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<?php
declare(strict_types=1);
/*
* This file is part of PHP CS Fixer.
*
* (c) Fabien Potencier <fabien@symfony.com>
* Dariusz Rumiński <dariusz.ruminski@gmail.com>
*
* This source file is subject to the MIT license that is bundled
* with this source code in the file LICENSE.
*/
namespace PhpCsFixer\Tokenizer;
use Symfony\Component\Finder\Finder;
use Symfony\Component\Finder\SplFileInfo;
/**
* Collection of Transformer classes.
*
* @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
*
* @internal
*/
final class Transformers
{
/**
* The registered transformers.
*
* @var TransformerInterface[]
*/
private $items = [];
/**
* Register built in Transformers.
*/
private function __construct()
{
$this->registerBuiltInTransformers();
usort($this->items, static function (TransformerInterface $a, TransformerInterface $b): int {
return $b->getPriority() <=> $a->getPriority();
});
}
public static function createSingleton(): self
{
static $instance = null;
if (!$instance) {
$instance = new self();
}
return $instance;
}
/**
* Transform given Tokens collection through all Transformer classes.
*
* @param Tokens $tokens Tokens collection
*/
public function transform(Tokens $tokens): void
{
foreach ($this->items as $transformer) {
foreach ($tokens as $index => $token) {
$transformer->process($tokens, $token, $index);
}
}
}
/**
* @param TransformerInterface $transformer Transformer
*/
private function registerTransformer(TransformerInterface $transformer): void
{
if (\PHP_VERSION_ID >= $transformer->getRequiredPhpVersionId()) {
$this->items[] = $transformer;
}
}
private function registerBuiltInTransformers(): void
{
static $registered = false;
if ($registered) {
return;
}
$registered = true;
foreach ($this->findBuiltInTransformers() as $transformer) {
$this->registerTransformer($transformer);
}
}
/**
* @return \Generator|TransformerInterface[]
*/
private function findBuiltInTransformers(): iterable
{
/** @var SplFileInfo $file */
foreach (Finder::create()->files()->in(__DIR__.'/Transformer') as $file) {
$relativeNamespace = $file->getRelativePath();
$class = __NAMESPACE__.'\\Transformer\\'.($relativeNamespace ? $relativeNamespace.'\\' : '').$file->getBasename('.php');
yield new $class();
}
}
}
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