Matthias Andreas Benkard | b382b10 | 2021-01-02 15:32:21 +0100 | [diff] [blame^] | 1 | <?php |
| 2 | |
| 3 | namespace PhpMimeMailParser; |
| 4 | |
| 5 | use PhpMimeMailParser\Contracts\MiddleWare as MiddleWareContracts; |
| 6 | |
| 7 | /** |
| 8 | * A stack of middleware chained together by (MiddlewareStack $next) |
| 9 | */ |
| 10 | class MiddlewareStack |
| 11 | { |
| 12 | /** |
| 13 | * Next MiddlewareStack in chain |
| 14 | * |
| 15 | * @var MiddlewareStack |
| 16 | */ |
| 17 | protected $next; |
| 18 | |
| 19 | /** |
| 20 | * Middleware in this MiddlewareStack |
| 21 | * |
| 22 | * @var Middleware |
| 23 | */ |
| 24 | protected $middleware; |
| 25 | |
| 26 | /** |
| 27 | * Construct the first middleware in this MiddlewareStack |
| 28 | * The next middleware is chained through $MiddlewareStack->add($Middleware) |
| 29 | * |
| 30 | * @param Middleware $middleware |
| 31 | */ |
| 32 | public function __construct(MiddleWareContracts $middleware = null) |
| 33 | { |
| 34 | $this->middleware = $middleware; |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Creates a chained middleware in MiddlewareStack |
| 39 | * |
| 40 | * @param Middleware $middleware |
| 41 | * @return MiddlewareStack Immutable MiddlewareStack |
| 42 | */ |
| 43 | public function add(MiddleWareContracts $middleware) |
| 44 | { |
| 45 | $stack = new static($middleware); |
| 46 | $stack->next = $this; |
| 47 | return $stack; |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Parses the MimePart by passing it through the Middleware |
| 52 | * @param MimePart $part |
| 53 | * @return MimePart |
| 54 | */ |
| 55 | public function parse(MimePart $part) |
| 56 | { |
| 57 | if (!$this->middleware) { |
| 58 | return $part; |
| 59 | } |
| 60 | $part = call_user_func(array($this->middleware, 'parse'), $part, $this->next); |
| 61 | return $part; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Creates a MiddlewareStack based on an array of middleware |
| 66 | * |
| 67 | * @param Middleware[] $middlewares |
| 68 | * @return MiddlewareStack |
| 69 | */ |
| 70 | public static function factory(array $middlewares = array()) |
| 71 | { |
| 72 | $stack = new static; |
| 73 | foreach ($middlewares as $middleware) { |
| 74 | $stack = $stack->add($middleware); |
| 75 | } |
| 76 | return $stack; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Allow calling MiddlewareStack instance directly to invoke parse() |
| 81 | * |
| 82 | * @param MimePart $part |
| 83 | * @return MimePart |
| 84 | */ |
| 85 | public function __invoke(MimePart $part) |
| 86 | { |
| 87 | return $this->parse($part); |
| 88 | } |
| 89 | } |