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<?php |
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namespace Underscore; |
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/** |
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* Callable registry for Underscore methods. |
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* |
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* It is assumed that all callables will be classes with an `__invoke` method. |
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* |
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* Existing methods can be overloaded by setting an alias of the same name: |
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* |
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* $registry->alias('keys', 'Acme\KeysMutator'); |
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* |
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* New methods can be added in the same way: |
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* |
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* $registry->alias('fancy', 'Acme\FancyInitializer'); |
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* |
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* Every alias is a singleton and will only be created once! If your callable |
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* requires construction, alias a fully constructed object instead: |
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* |
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* $registry->alias('fancy', new FancyInitializer($parameters)); |
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* |
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* NOTE: Mutators, accessors, and initializers all use the same registery and |
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* differ only in how they are used internally by Underscore. |
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*/ |
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class Registry |
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{ |
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/** |
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* @var array Classes aliased by name of method. |
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*/ |
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private $aliases = []; |
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/** |
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* @var array Callable instances aliased by name of method. |
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*/ |
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private $instances = []; |
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/** |
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* @param array $aliases |
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*/ |
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public function __construct(array $aliases = []) |
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{ |
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$this->aliases = $aliases; |
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} |
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/** |
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* Get the callable for an Underscore method alias. |
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* |
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* @param string $name |
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* @return callable |
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*/ |
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public function instance($name) |
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{ |
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if (empty($this->instances[$name])) { |
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if (empty($this->aliases[$name])) { |
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$this->aliasDefault($name); |
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} |
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$this->instances[$name] = new $this->aliases[$name]; |
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} |
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return $this->instances[$name]; |
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} |
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/** |
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* Alias method name to a callable. |
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* |
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* @param string $name |
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* @param callable $spec |
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* @return void |
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*/ |
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public function alias($name, $spec) |
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{ |
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if (is_callable($spec)) { |
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$this->instances[$name] = $spec; |
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} else { |
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$this->aliases[$name] = $spec; |
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// Ensure that the new alias will be used when called. |
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1 |
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unset($this->instances[$name]); |
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} |
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} |
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/** |
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* Define a default mutator, accessor, or initializer for a method name. |
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* |
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* @throws \BadMethodCallException If no default can be located. |
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* @param string $name |
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* @return void |
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*/ |
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private function aliasDefault($name) |
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{ |
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$spec = sprintf('\Underscore\Mutator\%sMutator', ucfirst($name)); |
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if (!class_exists($spec)) { |
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$spec = sprintf('\Underscore\Accessor\%sAccessor', ucfirst($name)); |
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} |
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if (!class_exists($spec)) { |
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$spec = sprintf('\Underscore\Initializer\%sInitializer', ucfirst($name)); |
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} |
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if (!class_exists($spec)) { |
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throw new \BadMethodCallException(sprintf('Unknown method Underscore->%s()', $name)); |
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} |
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$this->aliases[$name] = $spec; |
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} |
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} |
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Im0rtality /
Underscore
