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�i�t��B�������������?�� * @link http://en.wikipedia.org/wiki/Cron */ class CronExpression { const MINUTE = 0; const HOUR = 1; const DAY = 2; const MONTH = 3; const WEEKDAY = 4; const YEAR = 5; /** * @var array CRON expression parts */ private $cronParts; /** * @var CronExpression_FieldFactory CRON field factory */ private $fieldFactory; /** * @var array Order in which to test of cron parts */ private static $order = array(self::YEAR, self::MONTH, self::DAY, self::WEEKDAY, self::HOUR, self::MINUTE); /** * Factory method to create a new CronExpression. * * @param string $expression The CRON expression to create. There are * several special predefined values which can be used to substitute the * CRON expression: * * @yearly, @annually) - Run once a year, midnight, Jan. 1 - 0 0 1 1 * * @monthly - Run once a month, midnight, first of month - 0 0 1 * * * @weekly - Run once a week, midnight on Sun - 0 0 * * 0 * @daily - Run once a day, midnight - 0 0 * * * * @hourly - Run once an hour, first minute - 0 * * * * * *@param CronExpression_FieldFactory $fieldFactory (optional) Field factory to use * * @return CronExpression */ public static function factory($expression, CronExpression_FieldFactory $fieldFactory = null) { $mappings = array( '@yearly' => '0 0 1 1 *', '@annually' => '0 0 1 1 *', '@monthly' => '0 0 1 * *', '@weekly' => '0 0 * * 0', '@daily' => '0 0 * * *', '@hourly' => '0 * * * *' ); if (isset($mappings[$expression])) { $expression = $mappings[$expression]; } return new self($expression, $fieldFactory ? $fieldFactory : new CronExpression_FieldFactory()); } /** * Parse a CRON expression * * @param string $expression CRON expression (e.g. '8 * * * *') * @param CronExpression_FieldFactory $fieldFactory Factory to create cron fields */ public function __construct($expression, CronExpression_FieldFactory $fieldFactory) { $this->fieldFactory = $fieldFactory; $this->setExpression($expression); } /** * Set or change the CRON expression * * @param string $value CRON expression (e.g. 8 * * * *) * * @return CronExpression * @throws InvalidArgumentException if not a valid CRON expression */ public function setExpression($value) { $this->cronParts = preg_split('/\s/', $value, -1, PREG_SPLIT_NO_EMPTY); if (count($this->cronParts) < 5) { throw new InvalidArgumentException( $value . ' is not a valid CRON expression' ); } foreach ($this->cronParts as $position => $part) { $this->setPart($position, $part); } return $this; } /** * Set part of the CRON expression * * @param int $position The position of the CRON expression to set * @param string $value The value to set * * @return CronExpression * @throws InvalidArgumentException if the value is not valid for the part */ public function setPart($position, $value) { if (!$this->fieldFactory->getField($position)->validate($value)) { throw new InvalidArgumentException( 'Invalid CRON field value ' . $value . ' as position ' . $position ); } $this->cronParts[$position] = $value; return $this; } /** * Get a next run date relative to the current date or a specific date * * @param string|DateTime $currentTime (optional) Relative calculation date * @param int $nth (optional) Number of matches to skip before returning a * matching next run date. 0, the default, will return the current * date and time if the next run date falls on the current date and * time. Setting this value to 1 will skip the first match and go to * the second match. Setting this value to 2 will skip the first 2 * matches and so on. * @param bool $allowCurrentDate (optional) Set to TRUE to return the * current date if it matches the cron expression * * @return DateTime * @throws RuntimeException on too many iterations */ public function getNextRunDate($currentTime = 'now', $nth = 0, $allowCurrentDate = false) { return $this->getRunDate($currentTime, $nth, false, $allowCurrentDate); } /** * Get a previous run date relative to the current date or a specific date * * @param string|DateTime $currentTime (optional) Relative calculation date * @param int $nth (optional) Number of matches to skip before returning * @param bool $allowCurrentDate (optional) Set to TRUE to return the * current date if it matches the cron expression * * @return DateTime * @throws RuntimeException on too many iterations * @see CronExpression::getNextRunDate */ public function getPreviousRunDate($currentTime = 'now', $nth = 0, $allowCurrentDate = false) { return $this->getRunDate($currentTime, $nth, true, $allowCurrentDate); } /** * Get multiple run dates starting at the current date or a specific date * * @param int $total Set the total number of dates to calculate * @param string|DateTime $currentTime (optional) Relative calculation date * @param bool $invert (optional) Set to TRUE to retrieve previous dates * @param bool $allowCurrentDate (optional) Set to TRUE to return the * current date if it matches the cron expression * * @return array Returns an array of run dates */ public function getMultipleRunDates($total, $currentTime = 'now', $invert = false, $allowCurrentDate = false) { $matches = array(); for ($i = 0; $i < max(0, $total); $i++) { $matches[] = $this->getRunDate($currentTime, $i, $invert, $allowCurrentDate); } return $matches; } /** * Get all or part of the CRON expression * * @param string $part (optional) Specify the part to retrieve or NULL to * get the full cron schedule string. * * @return string|null Returns the CRON expression, a part of the * CRON expression, or NULL if the part was specified but not found */ public function getExpression($part = null) { if (null === $part) { return implode(' ', $this->cronParts); } elseif (array_key_exists($part, $this->cronParts)) { return $this->cronParts[$part]; } return null; } /** * Helper method to output the full expression. * * @return string Full CRON expression */ public function __toString() { return $this->getExpression(); } /** * Determine if the cron is due to run based on the current date or a * specific date. This method assumes that the current number of * seconds are irrelevant, and should be called once per minute. * * @param string|DateTime $currentTime (optional) Relative calculation date * * @return bool Returns TRUE if the cron is due to run or FALSE if not */ public function isDue($currentTime = 'now') { if ('now' === $currentTime) { $currentDate = date('Y-m-d H:i'); $currentTime = strtotime($currentDate); } elseif ($currentTime instanceof DateTime) { $currentDate = $currentTime->format('Y-m-d H:i'); $currentTime = strtotime($currentDate); } else { $currentTime = new DateTime($currentTime); $currentTime->setTime($currentTime->format('H'), $currentTime->format('i'), 0); $currentDate = $currentTime->format('Y-m-d H:i'); $currentTime = (int)($currentTime->getTimestamp()); } return $this->getNextRunDate($currentDate, 0, true)->getTimestamp() == $currentTime; } /** * Get the next or previous run date of the expression relative to a date * * @param string|DateTime $currentTime (optional) Relative calculation date * @param int $nth (optional) Number of matches to skip before returning * @param bool $invert (optional) Set to TRUE to go backwards in time * @param bool $allowCurrentDate (optional) Set to TRUE to return the * current date if it matches the cron expression * * @return DateTime * @throws RuntimeException on too many iterations */ protected function getRunDate($currentTime = null, $nth = 0, $invert = false, $allowCurrentDate = false) { if ($currentTime instanceof DateTime) { $currentDate = $currentTime; } else { $currentDate = new DateTime($currentTime ? $currentTime : 'now'); $currentDate->setTimezone(new DateTimeZone(date_default_timezone_get())); } $currentDate->setTime($currentDate->format('H'), $currentDate->format('i'), 0); $nextRun = clone $currentDate; $nth = (int) $nth; // Set a hard limit to bail on an impossible date for ($i = 0; $i < 1000; $i++) { foreach (self::$order as $position) { $part = $this->getExpression($position); if (null === $part) { continue; } $satisfied = false; // Get the field object used to validate this part $field = $this->fieldFactory->getField($position); // Check if this is singular or a list if (strpos($part, ',') === false) { $satisfied = $field->isSatisfiedBy($nextRun, $part); } else { foreach (array_map('trim', explode(',', $part)) as $listPart) { if ($field->isSatisfiedBy($nextRun, $listPart)) { $satisfied = true; break; } } } // If the field is not satisfied, then start over if (!$satisfied) { $field->increment($nextRun, $invert); continue 2; } } // Skip this match if needed if ((!$allowCurrentDate && $nextRun == $currentDate) || --$nth > -1) { $this->fieldFactory->getField(0)->increment($nextRun, $invert); continue; } return $nextRun; } // @codeCoverageIgnoreStart throw new RuntimeException('Impossible CRON expression'); // @codeCoverageIgnoreEnd } }