Chris@0: <?php
Chris@0: 
Chris@0: namespace Stack;
Chris@0: 
Chris@0: use Symfony\Component\HttpKernel\HttpKernelInterface;
Chris@0: 
Chris@0: class Builder
Chris@0: {
Chris@0:     private $specs;
Chris@0: 
Chris@0:     public function __construct()
Chris@0:     {
Chris@0:         $this->specs = new \SplStack();
Chris@0:     }
Chris@0: 
Chris@0:     public function unshift(/*$kernelClass, $args...*/)
Chris@0:     {
Chris@0:         if (func_num_args() === 0) {
Chris@0:             throw new \InvalidArgumentException("Missing argument(s) when calling unshift");
Chris@0:         }
Chris@0: 
Chris@0:         $spec = func_get_args();
Chris@0:         $this->specs->unshift($spec);
Chris@0: 
Chris@0:         return $this;
Chris@0:     }
Chris@0: 
Chris@0:     public function push(/*$kernelClass, $args...*/)
Chris@0:     {
Chris@0:         if (func_num_args() === 0) {
Chris@0:             throw new \InvalidArgumentException("Missing argument(s) when calling push");
Chris@0:         }
Chris@0: 
Chris@0:         $spec = func_get_args();
Chris@0:         $this->specs->push($spec);
Chris@0: 
Chris@0:         return $this;
Chris@0:     }
Chris@0: 
Chris@0:     public function resolve(HttpKernelInterface $app)
Chris@0:     {
Chris@0:         $middlewares = array($app);
Chris@0: 
Chris@0:         foreach ($this->specs as $spec) {
Chris@0:             $args = $spec;
Chris@0:             $firstArg = array_shift($args);
Chris@0: 
Chris@0:             if (is_callable($firstArg)) {
Chris@0:                 $app = $firstArg($app);
Chris@0:             } else {
Chris@0:                 $kernelClass = $firstArg;
Chris@0:                 array_unshift($args, $app);
Chris@0: 
Chris@0:                 $reflection = new \ReflectionClass($kernelClass);
Chris@0:                 $app = $reflection->newInstanceArgs($args);
Chris@0:             }
Chris@0: 
Chris@0:             array_unshift($middlewares, $app);
Chris@0:         }
Chris@0: 
Chris@0:         return new StackedHttpKernel($app, $middlewares);
Chris@0:     }
Chris@0: }