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<?php |
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/** |
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* Copyright (c) 2017–2018 Ryan Parman <http://ryanparman.com>. |
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* Copyright (c) 2017–2018 Contributors. |
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* |
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* http://opensource.org/licenses/Apache2.0 |
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*/ |
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declare(strict_types=1); |
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namespace SimplePie\Middleware; |
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use SimplePie\Configuration as C; |
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use SimplePie\Mixin as Tr; |
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/** |
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* The base middleware class that all other middleware classes extend from. It handles low-level functionality that is |
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* shared across all middleware classes. |
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*/ |
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abstract class AbstractMiddleware implements C\SetLoggerInterface |
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{ |
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use Tr\LoggerTrait; |
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/** |
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* A callable which is used to determine whether or not to run this middleware. |
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* |
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* @var callable |
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*/ |
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protected $fn; |
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/** |
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* Constructs a new instance of this class. |
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* |
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* Accepts a callable with the following function signature: |
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* |
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* ``` |
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* function () {} |
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* ``` |
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* |
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* @param callable|null $fn A callable which is used to determine whether or not to run this |
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* middleware. A value of `true` means that the middleware should run. |
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* A value of `false` means that the middleware should NOT run, By |
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* default, the middleware will run. |
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*/ |
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public function __construct(?callable $fn = null) |
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{ |
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$this->fn = $fn ?: static function () { |
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return true; |
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}; |
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} |
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/** |
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* Checks whether or not a particular property exists on an object, and if not, instantiates it as an array. |
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* |
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* @param mixed $object An object that you can add ad-hoc properties to. Preferably a `stdClass` object. |
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* @param string $property The name of the property to check and/or add. |
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*/ |
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public function addArrayProperty(&$object, string $property): void |
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{ |
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if (!isset($object->{$property})) { |
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$object->{$property} = []; |
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} |
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} |
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/** |
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* Return the value of an associative array key, if it exists. If not, return $default. |
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* |
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* @param array $arr The associative array to check. |
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* @param string $key The key in the associative array to return the value for. |
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* @param mixed $default The default value to return if there is no value. The default value is `null`. |
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* |
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* @return mixed |
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*/ |
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public function get(array $arr, string $key, $default = null) |
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{ |
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return $arr[$key] |
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?? $default; |
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} |
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} |
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simplepie /
simplepie-ng
