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<?php
namespace Jasny\Controller\View;
use Jasny\Flash;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* View using Twig
*/
trait Twig
{
/**
* Twig environment
* @var \Twig_Environment
*/
protected $twig = null;
/**
* Get server request
* @return ServerRequestInterface
*/
abstract public function getRequest();
/**
* Get server response
* @return ResponseInterface
*/
abstract public function getResponse();
/**
* Add a global variable to the view.
*
* @param string $name Variable name
* @param mixed $value
* @return $this
*/
public function setViewVariable($name, $value)
{
if (!$name) throw new \InvalidArgumentException("Name should not be empty");
$this->getTwig()->addGlobal($name, $value);
return $this;
}
/**
* Expose a function to the view.
*
* @param string $name Variable name
* @param mixed $function
* @param string $as 'function' or 'filter'
* @return $this
*/
public function setViewFunction($name, $function = null, $as = 'function')
{
if ($as === 'function') {
$this->getTwig()->addFunction($this->createTwigFunction($name, $function));
} elseif ($as === 'filter') {
$this->getTwig()->addFilter($this->createTwigFilter($name, $function));
} else {
throw new \InvalidArgumentException("You should create either function or filter, not '$as'");
}
return $this;
}
/**
* Add extension to view
*
* @param object $extension
* @return $this
*/
public function setViewExtension($extension)
{
$this->getTwig()->addExtension($extension);
return $this;
}
/**
* View rendered template
*
* @param string $name Template name
* @param array $context Template context
* @return ResponseInterface
*/
public function view($name, array $context = [])
{
if (!pathinfo($name, PATHINFO_EXTENSION)) $name .= '.html.twig';
$twig = $this->getTwig();
$tmpl = $twig->loadTemplate($name);
$response = $this->getResponse();
$response = $response->withHeader('Content-Type', 'text/html; charset=' . $twig->getCharset());
$response->getBody()->write($tmpl->render($context));
return $response;
}
/**
* Get twig environment
*
* @return \Twig_Environment
*/
public function getTwig()
{
if ($this->twig) return $this->twig;
$loader = $this->getTwigLoader();
$this->twig = $this->getTwigEnvironment($loader);
$extensions = ['DateExtension', 'PcreExtension', 'TextExtension', 'ArrayExtension'];
foreach ($extensions as $name) {
$class = "Jasny\Twig\\$name";
if (class_exists($class)) $this->setViewExtension(new $class());
}
$uri = $this->getRequest()->getUri()->getPath();
$this->setViewVariable('current_url', $uri);
$this->setViewVariable('flash', new Flash());
return $this->twig;
}
/**
* Get twig loasder for current working directory
*
* @return \Twig_Loader_Filesystem
*/
public function getTwigLoader()
{
return new \Twig_Loader_Filesystem(getcwd());
}
/**
* Get twig environment instance
*
* @param \Twig_Loader_Filesystem $loader
* @return \Twig_Environment
*/
public function getTwigEnvironment(\Twig_Loader_Filesystem $loader)
{
return new \Twig_Environment($loader);
}
/**
* Create twig function
*
* @param string $name Name of function in view
* @param callable|null $function
* @return \Twig_SimpleFunction
*/
public function createTwigFunction($name, $function)
{
if (!$name) throw new \InvalidArgumentException("Function name should not be empty");
return new \Twig_SimpleFunction($name, $function ?: $name);
}
/**
* Create twig filter
*
* @param string $name Name of filter in view
* @param callable|null $function
* @return \Twig_SimpleFilter
*/
public function createTwigFilter($name, $function)
{
if (!$name) throw new \InvalidArgumentException("Filter name should not be empty");
return new \Twig_SimpleFilter($name, $function ?: $name);
}
}
|
