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<?php
namespace Jasny\View\Plugin;
use Jasny\ViewInterface;
use Jasny\View\Twig as TwigView;
use Jasny\View\PluginInterface;
use Assetic\AssetWriter;
use Assetic\Extension\Twig\AsseticExtension;
use Assetic\Extension\Twig\TwigFormulaLoader;
use Assetic\Extension\Twig\TwigResource;
use Assetic\Factory\AssetFactory;
use Assetic\Factory\LazyAssetManager;
use Jasny\Assetic\TwigCachingFormulaLoader;
/**
* Assetic support for Twig
*/
class TwigAssetic implements PluginInterface
{
/**
* @var AssetFactory
*/
protected $factory;
/**
* @var AssetWriter
*/
protected $writer;
/**
* Class constructor
*
* @param AssetFactory $factory
* @param AssetWriter $writer
*/
public function __construct(AssetFactory $factory, AssetWriter $writer)
{
$this->factory = $factory;
$this->writer = $writer;
}
/**
* Check that the view is a twig view
*
* @param ViewInterface $view
* @throws \InvalidArgumentException
*/
protected function assertView(ViewInterface $view)
{
if (!$view instanceof TwigView) {
throw new \InvalidArgumentException("This plugin only works with a Twig view");
}
}
/**
* Create an assetic extension for Twig.
* @codeCoverageIgnore
*
* @return AsseticExtension
*/
protected function createExtension()
{
return new AsseticExtension($this->factory);
}
/**
* Create an assetic formula loader.
* @codeCoverageIgnore
*
* @param \Twig_Environment $twig
* @return TwigFormulaLoader
*/
protected function createFormulaLoader($twig)
{
$class = class_exists('Jasny\Assetic\TwigCachingFormulaLoader')
? TwigCachingFormulaLoader::class
: TwigFormulaLoader::class;
return new $class($twig);
}
/**
* Create an assetic asset manager.
* @codeCoverageIgnore
*
* @return LazyAssetManager
*/
protected function createAssetManager()
{
return new LazyAssetManager($this->factory);
}
/**
* Create an assetic twig resource.
* @codeCoverageIgnore
*
* @param \Twig_Environment $twig
* @param string $template
* @return TwigResource
*/
protected function createResource($twig, $template)
{
return new TwigResource($twig->getLoader(), $template);
}
/**
* Called when the plugin is added to the view.
*
* @param ViewInterface $view
*/
public function onAdd(ViewInterface $view)
{
$this->assertView($view);
$view->getTwig()->addExtension($this->createExtension());
}
/**
* Called when view renders a template.
*
* @param ViewInterface $view
* @param string $template Template filename
* @param array $context
*/
public function onRender(ViewInterface $view, $template, array $context)
{
$this->assertView($view);
$twig = $view->getTwig();
$loader = $this->createFormulaLoader($twig);
$assetManager = $this->createAssetManager($loader);
$assetManager->setLoader('twig', $loader);
$tmpl = $twig->loadTemplate($template);
do {
$name = (string)$tmpl;
$resource = $this->createResource($twig, $name);
$assetManager->addResource($resource, 'twig');
} while ($tmpl = $tmpl->getParent($context));
$this->writer->writeManagerAssets($assetManager);
}
}
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