valid() */ class ValidGenerator { protected $generator; protected $validator; protected $maxRetries; /** * @param Generator $generator */ public function __construct(Generator $generator, $validator = null, $maxRetries = 10000) { if (is_null($validator)) { $validator = function () { return true; }; } elseif (!is_callable($validator)) { throw new \InvalidArgumentException('valid() only accepts callables as first argument'); } $this->generator = $generator; $this->validator = $validator; $this->maxRetries = $maxRetries; } /** * Catch and proxy all generator calls but return only valid values * @param string $attribute */ public function __get($attribute) { return $this->__call($attribute, array()); } /** * Catch and proxy all generator calls with arguments but return only valid values * @param string $name * @param array $arguments */ public function __call($name, $arguments) { $i = 0; do { $res = call_user_func_array(array($this->generator, $name), $arguments); $i++; if ($i > $this->maxRetries) { throw new \OverflowException(sprintf('Maximum retries of %d reached without finding a valid value', $this->maxRetries)); } } while (!call_user_func($this->validator, $res)); return $res; } }