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Pipeline.php
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Pipeline.php
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<?php
declare(strict_types=1);
namespace Shoot\Shoot;
use Shoot\Shoot\Twig\NodeVisitor\ModelNodeVisitor;
use Shoot\Shoot\Twig\TokenParser\ModelTokenParser;
use Twig_ExtensionInterface as ExtensionInterface;
use Twig_Filter as TwigFilter;
use Twig_Function as TwigFunction;
use Twig_NodeVisitorInterface as NodeVisitorInterface;
use Twig_Test as TwigTest;
use Twig_TokenParserInterface as TokenParserInterface;
final class Pipeline implements ExtensionInterface, PipelineInterface
{
/** @var Context */
private $context;
/** @var callable */
private $middleware;
/**
* @param MiddlewareInterface[] $middleware
*/
public function __construct(array $middleware = [])
{
$this->middleware = $this->chainMiddleware($middleware);
$this->clearContext();
}
/**
* Chains the middleware into a single callable.
*
* @param MiddlewareInterface[] $middleware
*
* @return callable
*/
private function chainMiddleware(array $middleware): callable
{
$middleware = array_reverse($middleware);
return array_reduce($middleware, function (callable $next, MiddlewareInterface $middleware) {
return function (View $view) use ($middleware, $next): View {
return $middleware->process($view, $this->context, $next);
};
}, function (View $view): View {
$view->render();
return $view;
});
}
/**
* Applies the given context to the pipeline, executes the given callback, and clears the context.
*
* @param ContextInterface $context
* @param callable $callback
*
* @return mixed The result as returned by the callback (if any).
*/
public function withContext(ContextInterface $context, callable $callback)
{
try {
$this->applyContext($context);
return $callback();
} finally {
$this->clearContext();
}
}
/**
* Apply the given context attributes to the pipeline.
*
* @param ContextInterface $context
*
* @return void
*/
private function applyContext(ContextInterface $context)
{
$this->context = $context;
}
/**
* Clear the current context.
*
* @return void
*/
private function clearContext()
{
$this->applyContext(new Context());
}
/**
* @internal This method is used by the compiled Twig templates to access the pipeline. It should not be used
* directly.
*
* @param View $view
*
* @return void
*/
public function process(View $view)
{
call_user_func($this->middleware, $view);
}
/**
*§
* Returns a list of filters to add to the existing list.
*
* @return TwigFilter[]
*/
public function getFilters(): array
{
return [
new TwigFilter('variables', function (PresentationModel $presentationModel): array {
return $presentationModel->getVariables();
}),
];
}
/**
* Returns a list of functions to add to the existing list.
*
* @return TwigFunction[]
*/
public function getFunctions(): array
{
return [];
}
/**
* Returns the node visitor instances to add to the existing list.
*
* @return NodeVisitorInterface[]
*/
public function getNodeVisitors(): array
{
return [new ModelNodeVisitor()];
}
/**
* Returns a list of operators to add to the existing list.
*
* @return array[] First array of unary operators, second array of binary operators
*/
public function getOperators(): array
{
return [];
}
/**
* Returns a list of tests to add to the existing list.
*
* @return TwigTest[]
*/
public function getTests(): array
{
return [
new TwigTest('model', function ($value): bool {
return $value instanceof PresentationModel;
}),
];
}
/**
* Returns the token parser instances to add to the existing list.
*
* @return TokenParserInterface[]
*/
public function getTokenParsers(): array
{
return [new ModelTokenParser()];
}
}