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Twig.php
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Twig.php
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<?php
/**
* Slim Framework (http://slimframework.com)
*
* @license https://github.com/slimphp/Twig-View/blob/master/LICENSE.md (MIT License)
*/
declare(strict_types=1);
namespace Slim\Views;
use ArrayAccess;
use ArrayIterator;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use ReturnTypeWillChange;
use RuntimeException;
use Throwable;
use Twig\Environment;
use Twig\Error\LoaderError;
use Twig\Error\RuntimeError;
use Twig\Error\SyntaxError;
use Twig\Extension\ExtensionInterface;
use Twig\Loader\FilesystemLoader;
use Twig\Loader\LoaderInterface;
use Twig\RuntimeLoader\RuntimeLoaderInterface;
use function array_key_exists;
use function array_merge;
use function count;
use function is_array;
use function is_string;
/**
* Twig View
*
* This class is a Slim Framework view helper built on top of the Twig templating component.
* Twig is a PHP component created by Fabien Potencier.
*
* @link https://twig.symfony.com/
*
* @implements ArrayAccess<string, mixed>
*/
class Twig implements ArrayAccess
{
/**
* Twig loader
*/
protected LoaderInterface $loader;
/**
* Twig environment
*/
protected Environment $environment;
/**
* Default view variables
*
* @var array<string, mixed>
*/
protected array $defaultVariables = [];
/**
* @param ServerRequestInterface $request
* @param string $attributeName
*
* @return Twig
*/
public static function fromRequest(ServerRequestInterface $request, string $attributeName = 'view'): self
{
$twig = $request->getAttribute($attributeName);
if (!($twig instanceof self)) {
throw new RuntimeException(
'Twig could not be found in the server request attributes using the key "' . $attributeName . '".'
);
}
return $twig;
}
/**
* @param string|string[] $path Path(s) to templates directory
* @param array<string, mixed> $settings Twig environment settings
*
* @throws LoaderError When the template cannot be found
*
* @return Twig
*/
public static function create($path, array $settings = []): self
{
$loader = new FilesystemLoader();
$paths = is_array($path) ? $path : [$path];
foreach ($paths as $namespace => $path) {
if (is_string($namespace)) {
$loader->setPaths($path, $namespace);
} else {
$loader->addPath($path);
}
}
return new self($loader, $settings);
}
/**
* @param LoaderInterface $loader Twig loader
* @param array<string, mixed> $settings Twig environment settings
*/
public function __construct(LoaderInterface $loader, array $settings = [])
{
$this->loader = $loader;
$this->environment = new Environment($this->loader, $settings);
$extension = new TwigExtension();
$this->addExtension($extension);
}
/**
* Proxy method to add an extension to the Twig environment
*
* @param ExtensionInterface $extension A single extension instance or an array of instances
*/
public function addExtension(ExtensionInterface $extension): void
{
$this->environment->addExtension($extension);
}
/**
* Proxy method to add a runtime loader to the Twig environment
*
* @param RuntimeLoaderInterface $runtimeLoader
*/
public function addRuntimeLoader(RuntimeLoaderInterface $runtimeLoader): void
{
$this->environment->addRuntimeLoader($runtimeLoader);
}
/**
* Fetch rendered template
*
* @param string $template Template pathname relative to templates directory
* @param array<string, mixed> $data Associative array of template variables
*
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
* @throws RuntimeError When an error occurred during rendering
*
* @return string
*/
public function fetch(string $template, array $data = []): string
{
$data = array_merge($this->defaultVariables, $data);
return $this->environment->render($template, $data);
}
/**
* Fetch rendered block
*
* @param string $template Template pathname relative to templates directory
* @param string $block Name of the block within the template
* @param array<string, mixed> $data Associative array of template variables
*
* @throws Throwable When an error occurred during rendering
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
*
* @return string
*/
public function fetchBlock(string $template, string $block, array $data = []): string
{
$data = array_merge($this->defaultVariables, $data);
return $this->environment->resolveTemplate($template)->renderBlock($block, $data);
}
/**
* Fetch rendered string
*
* @param string $string String
* @param array<string, mixed> $data Associative array of template variables
*
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
*
* @return string
*/
public function fetchFromString(string $string = '', array $data = []): string
{
$data = array_merge($this->defaultVariables, $data);
return $this->environment->createTemplate($string)->render($data);
}
/**
* Output rendered template
*
* @param ResponseInterface $response
* @param string $template Template pathname relative to templates directory
* @param array<string, mixed> $data Associative array of template variables
*
* @throws LoaderError When the template cannot be found
* @throws SyntaxError When an error occurred during compilation
* @throws RuntimeError When an error occurred during rendering
*
* @return ResponseInterface
*/
public function render(ResponseInterface $response, string $template, array $data = []): ResponseInterface
{
$response->getBody()->write($this->fetch($template, $data));
return $response;
}
/**
* Return Twig loader
*
* @return LoaderInterface
*/
public function getLoader(): LoaderInterface
{
return $this->loader;
}
/**
* Return Twig environment
*
* @return Environment
*/
public function getEnvironment(): Environment
{
return $this->environment;
}
/**
* Does this collection have a given key?
*
* @param string $key The data key
*
* @return bool
*/
public function offsetExists($key): bool
{
return array_key_exists($key, $this->defaultVariables);
}
/**
* Get collection item for key
*
* @param string $key The data key
*
* @return mixed The key's value, or the default value
*/
#[ReturnTypeWillChange]
public function offsetGet($key)
{
if (!$this->offsetExists($key)) {
return null;
}
return $this->defaultVariables[$key];
}
/**
* Set collection item
*
* @param string $key The data key
* @param mixed $value The data value
*/
public function offsetSet($key, $value): void
{
$this->defaultVariables[$key] = $value;
}
/**
* Remove item from collection
*
* @param string $key The data key
*/
public function offsetUnset($key): void
{
unset($this->defaultVariables[$key]);
}
/**
* Get number of items in collection
*
* @return int
*/
public function count(): int
{
return count($this->defaultVariables);
}
/**
* Get collection iterator
*
* @return ArrayIterator<string, mixed>
*/
public function getIterator(): ArrayIterator
{
return new ArrayIterator($this->defaultVariables);
}
}