<?php
declare(strict_types=1);
namespace Cron;
use DateTimeInterface;
/**
* CRON field interface.
*/
interface FieldInterface
{
/**
* Check if the respective value of a DateTime field satisfies a CRON exp.
*
* @internal
* @param DateTimeInterface $date DateTime object to check
* @param string $value CRON expression to test against
*
* @return bool Returns TRUE if satisfied, FALSE otherwise
*/
public function isSatisfiedBy(DateTimeInterface $date, $value, bool $invert): bool;
/**
* When a CRON expression is not satisfied, this method is used to increment
* or decrement a DateTime object by the unit of the cron field.
*
* @internal
* @param DateTimeInterface $date DateTime object to change
* @param bool $invert (optional) Set to TRUE to decrement
* @param string|null $parts (optional) Set parts to use
*
* @return FieldInterface
*/
public function increment(DateTimeInterface &$date, $invert = false, $parts = null): FieldInterface;
/**
* Validates a CRON expression for a given field.
*
* @param string $value CRON expression value to validate
*
* @return bool Returns TRUE if valid, FALSE otherwise
*/
public function validate(string $value): bool;
}
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