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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Bridge\Twig;
use Symfony\Component\Templating\EngineInterface;
use Symfony\Component\Templating\StreamingEngineInterface;
use Symfony\Component\Templating\TemplateNameParserInterface;
use Symfony\Component\Templating\TemplateReferenceInterface;
/**
* This engine knows how to render Twig templates.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class TwigEngine implements EngineInterface, StreamingEngineInterface
{
protected $environment;
protected $parser;
/**
* Constructor.
*
* @param \Twig_Environment $environment A \Twig_Environment instance
* @param TemplateNameParserInterface $parser A TemplateNameParserInterface instance
*/
public function __construct(\Twig_Environment $environment, TemplateNameParserInterface $parser)
{
$this->environment = $environment;
$this->parser = $parser;
}
/**
* {@inheritdoc}
*
* It also supports \Twig_Template as name parameter.
*
* @throws \Twig_Error if something went wrong like a thrown exception while rendering the template
*/
public function render($name, array $parameters = array())
{
return $this->load($name)->render($parameters);
}
/**
* {@inheritdoc}
*
* It also supports \Twig_Template as name parameter.
*
* @throws \Twig_Error if something went wrong like a thrown exception while rendering the template
*/
public function stream($name, array $parameters = array())
{
$this->load($name)->display($parameters);
}
/**
* {@inheritdoc}
*
* It also supports \Twig_Template as name parameter.
*/
public function exists($name)
{
if ($name instanceof \Twig_Template) {
return true;
}
$loader = $this->environment->getLoader();
if ($loader instanceof \Twig_ExistsLoaderInterface) {
return $loader->exists((string) $name);
}
try {
// cast possible TemplateReferenceInterface to string because the
// EngineInterface supports them but Twig_LoaderInterface does not
$loader->getSource((string) $name);
} catch (\Twig_Error_Loader $e) {
return false;
}
return true;
}
/**
* {@inheritdoc}
*
* It also supports \Twig_Template as name parameter.
*/
public function supports($name)
{
if ($name instanceof \Twig_Template) {
return true;
}
$template = $this->parser->parse($name);
return 'twig' === $template->get('engine');
}
/**
* Loads the given template.
*
* @param string|TemplateReferenceInterface|\Twig_Template $name A template name or an instance of
* TemplateReferenceInterface or \Twig_Template
*
* @return \Twig_TemplateInterface A \Twig_TemplateInterface instance
*
* @throws \InvalidArgumentException if the template does not exist
*/
protected function load($name)
{
if ($name instanceof \Twig_Template) {
return $name;
}
try {
return $this->environment->loadTemplate((string) $name);
} catch (\Twig_Error_Loader $e) {
throw new \InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
}
}
}