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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;
/**
* 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;
}
/**
* Renders a template.
*
* @param mixed $name A template name
* @param array $parameters An array of parameters to pass to the template
*
* @return string The evaluated template as a string
*
* @throws \InvalidArgumentException if the template does not exist
* @throws \RuntimeException if the template cannot be rendered
*/
public function render($name, array $parameters = array())
{
return $this->load($name)->render($parameters);
}
/**
* Streams a template.
*
* @param mixed $name A template name or a TemplateReferenceInterface instance
* @param array $parameters An array of parameters to pass to the template
*
* @throws \RuntimeException if the template cannot be rendered
*/
public function stream($name, array $parameters = array())
{
$this->load($name)->display($parameters);
}
/**
* Returns true if the template exists.
*
* @param mixed $name A template name
*
* @return Boolean true if the template exists, false otherwise
*/
public function exists($name)
{
try {
$this->load($name);
} catch (\InvalidArgumentException $e) {
return false;
}
return true;
}
/**
* Returns true if this class is able to render the given template.
*
* @param string $name A template name
*
* @return Boolean True if this class supports the given resource, false otherwise
*/
public function supports($name)
{
if ($name instanceof \Twig_Template) {
return true;
}
$template = $this->parser->parse($name);
return 'twig' === $template->get('engine');
}
/**
* Loads the given template.
*
* @param mixed $name A template name or an instance of Twig_Template
*
* @return \Twig_TemplateInterface A \Twig_TemplateInterface instance
*
* @throws \InvalidArgumentException if the template does not exist
*/
protected function load($name)
{
if ($name instanceof \Twig_Template) {
return $name;
}
try {
return $this->environment->loadTemplate($name);
} catch (\Twig_Error_Loader $e) {
throw new \InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
}
}
}
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