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<?php |
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/* |
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* This file is part of the Ariadne Component Library. |
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* |
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* (c) Muze <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace arc; |
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/** |
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* Class lambda |
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* Experimental functionality, may be removed later, use at own risk. |
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* @package arc |
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*/ |
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class lambda |
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{ |
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/** |
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* Creates a new Prototype object |
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* @param $properties |
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* @return lambda\Prototype |
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*/ |
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public static function prototype($properties) |
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{ |
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// do not ever use a single prototype for every other lambda\Prototype |
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// it will allow evil stuff with state shared across everything |
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return new lambda\Prototype( $properties ); |
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} |
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/** |
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* Returns a function with the given arguments already entered or partially applied. |
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* @param callable $callable The function to curry |
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* @param array $partialArgs unlimited Optional arguments to curry the function with |
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* @param array $defaultArgs optional default values |
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* @return callable |
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*/ |
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public static function partial(callable $callable, $partialArgs, $defaultArgs = []) |
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{ |
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return function () use ($callable, $partialArgs, $defaultArgs) { |
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return call_user_func_array( $callable, self::partialMerge( $partialArgs, func_get_args(), $defaultArgs ) ); |
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}; |
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} |
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private static function partialMerge($partialArgs, $addedArgs, $defaultArgs = []) |
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{ |
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end( $partialArgs ); |
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$l = key( $partialArgs ); |
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for ($i = 0; $i <= $l; $i++) { |
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if (!array_key_exists($i, $partialArgs) && count($addedArgs)) { |
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$partialArgs[ $i ] = array_shift( $addedArgs ); |
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} |
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} |
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if (count($addedArgs)) { // there are $addedArgs left, so there should be no 'holes' in $partialArgs |
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$partialArgs =array_merge( $partialArgs, $addedArgs ); |
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} |
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// fill any 'holes' in $partialArgs with entries from $defaultArgs |
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$result = array_replace( $defaultArgs, $partialArgs ); |
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ksort($result); |
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return $result; |
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} |
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/** |
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* Returns a function with named arguments. The peppered function accepts one argument - a named array of values |
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* @param callable $callable The function or method to pepper |
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* @param array $namedArgs Optional. The named arguments to pepper the function with, the order must be the order |
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* in which the unpeppered function expects them. If not set, pepper will use Reflection to get them. |
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* Format is [ 'argumentName' => 'defaultValue' ] |
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* @return callable |
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*/ |
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public static function pepper(callable $callable, $namedArgs=null) |
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{ |
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if ( !is_array( $namedArgs ) ) { |
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$ref = !is_array($callable) ? new \ReflectionFunction($callable) : new \ReflectionMethod($callable[0], $callable[1]); |
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$namedArgs = []; |
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foreach ($ref->getParameters() as $parameter) { |
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$namedArgs[ $parameter->getName() ] = $parameter->getDefaultValue(); |
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} |
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} |
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return function ($otherArgs) use ($callable, $namedArgs) { |
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$args = array_values( array_merge( $namedArgs, $otherArgs ) ); |
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return call_user_func_array( $callable, $args ); |
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}; |
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} |
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/** |
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* Returns a method that will generate and call the given function only once and return its result for every call. |
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* The first call generates the result. Each subsequent call simply returns that same result. This allows you |
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* to create in-context singletons for any kind of object. |
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* <code> |
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* $proto = \arc\lambda::prototype([ |
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* 'getSingleton' => \arc\lambda::singleton( function () { |
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* return new ComplexObject(); |
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* }) |
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* ]); |
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* </code> |
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* @param callable $f The function to generate the singleton. |
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* @return mixed The singleton. |
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*/ |
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public static function singleton($f) |
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{ |
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return function () use ($f) { |
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static $result; |
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if (null === $result) { |
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$result = $f(); |
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} |
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return $result; |
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}; |
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} |
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} |
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Ariadne-CMS /
arc-base
