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<?php
/* this file is part of pipelines */
namespace Ktomk\Pipelines\Value;
use Ktomk\Pipelines\Utility\App;
use UnexpectedValueException;
/**
* Pipelines Prefix
*
* @package Ktomk\Pipelines\Value
*/
abstract class Prefix
{
const DEFAULT_PREFIX = App::UTILITY_NAME;
* @param string $prefix
* @return string
public static function verify($prefix)
if (preg_match('~^[a-z]{3,}$~', $prefix)) {
return $prefix;
}
throw new UnexpectedValueException(sprintf(
'invalid prefix: "%s"; a prefix is only lower-case letters with a minimum length of three characters',
$prefix
));
* filter a prefix
* always return a verified prefix (string)
* @param null|string $prefix [optional] if null, defaults to the default prefix
* @return string verified prefix
public static function filter($prefix = null)
$buffer = $prefix;
if (null === $buffer) {
$buffer = self::DEFAULT_PREFIX;
return self::verify($buffer);
ktomk /
pipelines
