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<?php |
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namespace Jasny\View; |
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use Jasny\ViewInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Abstraction to use Twig with PSR-7 |
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*/ |
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class Twig implements ViewInterface |
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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; |
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/** |
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* Class constructor |
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* |
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* @param \Twig_Environment|array $options |
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*/ |
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public function __construct($options) |
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{ |
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$twig = is_array($options) ? $this->createTwigEnvironment($options) : $options; |
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if (!$twig instanceof \Twig_Environment) { |
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throw new \InvalidArgumentException("Was expecting an array with options or a Twig_Environment, got a " |
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. (is_object($twig) ? get_class($twig) . ' ' : '') . gettype($twig)); |
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} |
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$this->twig = $twig; |
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} |
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/** |
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* Create a new Twig environment |
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* |
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* @param array $options |
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* @return \Twig_Environment |
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*/ |
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protected function createTwigEnvironment(array $options) |
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{ |
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if (!isset($options['path'])) { |
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throw new \BadMethodCallException("'path' option is required"); |
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} |
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$loader = new \Twig_Loader_Filesystem(); |
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$this->addLoaderPaths($loader, $options['path']); |
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return new \Twig_Environment($loader, $options); |
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} |
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/** |
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* Add paths to Twig loader |
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* |
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* @param \Twig_Loader_Filesystem $loader |
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* @param string|array $paths |
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* @return type |
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*/ |
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protected function addLoaderPaths(\Twig_Loader_Filesystem $loader, $paths) |
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{ |
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foreach ((array)$paths as $namespace => $path) { |
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if (is_int($namespace)) { |
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$namespace = \Twig_Loader_Filesystem::MAIN_NAMESPACE; |
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} |
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$loader->addPath($path, $namespace); |
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} |
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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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return $this->twig; |
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} |
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/** |
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* Assert valid variable, function and filter name |
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* |
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* @param string $name |
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* @throws \InvalidArgumentException |
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*/ |
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protected function assertViewVariableName($name) |
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{ |
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if (!is_string($name)) { |
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$type = (is_object($name) ? get_class($name) . ' ' : '') . gettype($name); |
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throw new \InvalidArgumentException("Expected name to be a string, not a $type"); |
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} |
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if (!preg_match('/^[a-z]\w*$/i', $name)) { |
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throw new \InvalidArgumentException("Invalid name '$name'"); |
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} |
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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 $name Function name in template |
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* @param callable|null $function |
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* @param string $as 'function' or 'filter' |
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* @return $this |
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*/ |
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public function expose($name, $function = null, $as = 'function') |
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{ |
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$this->assertViewVariableName($name); |
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if ($as === 'function') { |
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$function = new \Twig_SimpleFunction($name, $function ?: $name); |
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$this->getTwig()->addFunction($function); |
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} elseif ($as === 'filter') { |
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$filter = new \Twig_SimpleFilter($name, $function ?: $name); |
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$this->getTwig()->addFilter($filter); |
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} else { |
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$not = is_string($as) ? "'$as'" : gettype($as); |
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throw new \InvalidArgumentException("You can create either a 'function' or 'filter', not a $not"); |
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} |
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return $this; |
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} |
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/** |
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* Add the official Twig extension and Jansy Twig extensions. |
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* |
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* @link https://github.com/twigphp/Twig-extensions |
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* @link https://github.com/jasny/twig-extensions |
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* |
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* @return $this |
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*/ |
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public function addDefaultExtensions() |
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{ |
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$extensions = [ |
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'Twig_Extensions_Extension_Array', |
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'Twig_Extensions_Extension_Date', |
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'Twig_Extensions_Extension_I18n', |
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'Twig_Extensions_Extension_Intl', |
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'Twig_Extensions_Extension_Text', |
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'Jasny\Twig\DateExtension', |
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'Jasny\Twig\PcreExtension', |
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'Jasny\Twig\TextExtension', |
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'Jasny\Twig\ArrayExtension' |
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]; |
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1 |
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foreach ($extensions as $class) { |
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if (class_exists($class)) { |
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$this->getTwig()->addExtension(new $class()); |
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} |
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} |
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} |
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/** |
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* Get the filename |
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* |
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* @return string |
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*/ |
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protected function getFilename($name) |
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{ |
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if (pathinfo($name, PATHINFO_EXTENSION) === '') { |
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$name .= substr($name, -1) === '/' ? 'index.html.twig' : '.html.twig'; |
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} |
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return $name; |
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} |
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/** |
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* Render and output template |
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* |
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* @param ResponseInterface $response |
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* @param string $name Template name |
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* @param array $context Template context as associated array |
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* @return ResponseInterface |
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*/ |
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public function render(ResponseInterface $response, $name, array $context = []) |
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{ |
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$file = $this->getFilename($name); |
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$twig = $this->getTwig(); |
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$tmpl = $twig->loadTemplate($file); |
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$contents = $tmpl->render($context); |
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$newResponse = $response->withHeader('Content-Type', 'text/html; charset=' . $twig->getCharset()); |
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$newResponse->getBody()->write($contents); |
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return $newResponse; |
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} |
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} |
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jasny /
view
