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