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<?php |
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/* |
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* This file is part of the PHP-UNDERSCORE package. |
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* |
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* (c) Jitendra Adhikari <[email protected]> |
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* <https://github.com/adhocore> |
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* |
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* Licensed under MIT license. |
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*/ |
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namespace Ahc\Underscore; |
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class UnderscoreFunction extends UnderscoreArray |
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{ |
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/** |
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* Returns a callable which when invoked caches the result for given arguments |
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* and reuses that result in subsequent calls. |
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* |
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* @param callable $fn The main callback. |
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* |
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* @return mixed |
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*/ |
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public function memoize(callable $fn) |
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{ |
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static $memo = []; |
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return function () use (&$memo, $fn) { |
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$hash = \md5(\json_encode($args = \func_get_args())); |
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if (isset($memo[$hash])) { |
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return $memo[$hash]; |
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} |
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return $memo[$hash] = \call_user_func_array($fn, $args); |
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}; |
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} |
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/** |
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* Cache the result of callback for given arguments and reuse that in subsequent call. |
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* |
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* @param callable $fn The main callback. |
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* @param int $wait The time to wait in millisec. |
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* |
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* @return mixed |
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*/ |
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public function delay(callable $fn, $wait) |
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{ |
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return function () use ($fn, $wait) { |
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\usleep(1000 * $wait); |
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return \call_user_func_array($fn, \func_get_args()); |
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}; |
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} |
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/** |
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* Returns a callable that wraps given callable which can be only invoked |
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* at most once per given $wait threshold. |
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* |
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* @param callable $fn The main callback. |
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* @param int $wait The callback will only be triggered at most once within this period. |
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* |
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* @return mixed The return set of callback if runnable else the previous cache. |
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*/ |
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public function throttle(callable $fn, $wait) |
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{ |
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static $previous = 0; |
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static $result = null; |
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return function () use ($fn, &$previous, &$result, &$wait) { |
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$now = $this->now(); |
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if (!$previous) { |
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$previous = $now; |
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} |
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$remaining = $wait - ($now - $previous); |
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if ($remaining <= 0 || $remaining > $wait) { |
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$previous = $now; |
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$result = \call_user_func_array($fn, \func_get_args()); |
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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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* Returns a function that is the composition of a list of functions, |
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* each consuming the return value of the function that follows. |
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* |
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* Note that last function is executed first. |
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* |
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* @param callable $fn1 |
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* @param callable $fn2 |
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* @param ...callable|null $fn3 And so on! |
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* |
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* @return mixed Final result value. |
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*/ |
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public function compose(callable $fn1, callable $fn2 /* , callable $fn3 = null */) |
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{ |
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$fns = \func_get_args(); |
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$start = \func_num_args() - 1; |
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return function () use ($fns, $start) { |
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$i = $start; |
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$result = \call_user_func_array($fns[$start], \func_get_args()); |
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while ($i--) { |
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$result = $fns[$i]($result); |
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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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adhocore /
php-underscore
