319 lines
11 KiB
PHP
319 lines
11 KiB
PHP
<?php
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/**
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* CRON expression parser that can determine whether or not a CRON expression is
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* due to run, the next run date and previous run date of a CRON expression.
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* The determinations made by this class are accurate if checked run once per
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* minute (seconds are dropped from date time comparisons).
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*
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* Schedule parts must map to:
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* minute [0-59], hour [0-23], day of month, month [1-12|JAN-DEC], day of week
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* [1-7|MON-SUN], and an optional year.
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*
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* @author Michael Dowling <mtdowling@gmail.com>
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* @link http://en.wikipedia.org/wiki/Cron
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*/
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class CronExpression
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{
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const MINUTE = 0;
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const HOUR = 1;
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const DAY = 2;
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const MONTH = 3;
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const WEEKDAY = 4;
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const YEAR = 5;
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/**
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* @var array CRON expression parts
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*/
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private $cronParts;
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/**
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* @var CronExpression_FieldFactory CRON field factory
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*/
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private $fieldFactory;
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/**
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* @var array Order in which to test of cron parts
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*/
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private static $order = array(self::YEAR, self::MONTH, self::DAY, self::WEEKDAY, self::HOUR, self::MINUTE);
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/**
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* Factory method to create a new CronExpression.
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*
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* @param string $expression The CRON expression to create. There are
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* several special predefined values which can be used to substitute the
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* CRON expression:
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*
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* @yearly, @annually) - Run once a year, midnight, Jan. 1 - 0 0 1 1 *
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* @monthly - Run once a month, midnight, first of month - 0 0 1 * *
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* @weekly - Run once a week, midnight on Sun - 0 0 * * 0
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* @daily - Run once a day, midnight - 0 0 * * *
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* @hourly - Run once an hour, first minute - 0 * * * *
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*
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*@param CronExpression_FieldFactory $fieldFactory (optional) Field factory to use
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*
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* @return CronExpression
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*/
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public static function factory($expression, CronExpression_FieldFactory $fieldFactory = null)
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{
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$mappings = array(
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'@yearly' => '0 0 1 1 *',
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'@annually' => '0 0 1 1 *',
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'@monthly' => '0 0 1 * *',
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'@weekly' => '0 0 * * 0',
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'@daily' => '0 0 * * *',
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'@hourly' => '0 * * * *'
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);
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if (isset($mappings[$expression])) {
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$expression = $mappings[$expression];
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}
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return new self($expression, $fieldFactory ? $fieldFactory : new CronExpression_FieldFactory());
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}
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/**
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* Parse a CRON expression
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*
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* @param string $expression CRON expression (e.g. '8 * * * *')
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* @param CronExpression_FieldFactory $fieldFactory Factory to create cron fields
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*/
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public function __construct($expression, CronExpression_FieldFactory $fieldFactory)
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{
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$this->fieldFactory = $fieldFactory;
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$this->setExpression($expression);
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}
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/**
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* Set or change the CRON expression
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*
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* @param string $value CRON expression (e.g. 8 * * * *)
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*
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* @return CronExpression
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* @throws InvalidArgumentException if not a valid CRON expression
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*/
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public function setExpression($value)
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{
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$this->cronParts = preg_split('/\s/', $value, -1, PREG_SPLIT_NO_EMPTY);
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if (count($this->cronParts) < 5) {
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throw new InvalidArgumentException(
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$value . ' is not a valid CRON expression'
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);
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}
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foreach ($this->cronParts as $position => $part) {
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$this->setPart($position, $part);
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}
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return $this;
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}
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/**
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* Set part of the CRON expression
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*
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* @param int $position The position of the CRON expression to set
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* @param string $value The value to set
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*
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* @return CronExpression
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* @throws InvalidArgumentException if the value is not valid for the part
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*/
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public function setPart($position, $value)
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{
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if (!$this->fieldFactory->getField($position)->validate($value)) {
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throw new InvalidArgumentException(
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'Invalid CRON field value ' . $value . ' as position ' . $position
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);
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}
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$this->cronParts[$position] = $value;
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return $this;
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}
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/**
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* Get a next run date relative to the current date or a specific date
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*
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* @param string|DateTime $currentTime (optional) Relative calculation date
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* @param int $nth (optional) Number of matches to skip before returning a
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* matching next run date. 0, the default, will return the current
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* date and time if the next run date falls on the current date and
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* time. Setting this value to 1 will skip the first match and go to
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* the second match. Setting this value to 2 will skip the first 2
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* matches and so on.
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* @param bool $allowCurrentDate (optional) Set to TRUE to return the
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* current date if it matches the cron expression
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*
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* @return DateTime
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* @throws RuntimeException on too many iterations
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*/
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public function getNextRunDate($currentTime = 'now', $nth = 0, $allowCurrentDate = false)
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{
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return $this->getRunDate($currentTime, $nth, false, $allowCurrentDate);
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}
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/**
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* Get a previous run date relative to the current date or a specific date
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*
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* @param string|DateTime $currentTime (optional) Relative calculation date
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* @param int $nth (optional) Number of matches to skip before returning
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* @param bool $allowCurrentDate (optional) Set to TRUE to return the
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* current date if it matches the cron expression
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*
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* @return DateTime
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* @throws RuntimeException on too many iterations
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* @see CronExpression::getNextRunDate
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*/
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public function getPreviousRunDate($currentTime = 'now', $nth = 0, $allowCurrentDate = false)
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{
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return $this->getRunDate($currentTime, $nth, true, $allowCurrentDate);
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}
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/**
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* Get multiple run dates starting at the current date or a specific date
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*
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* @param int $total Set the total number of dates to calculate
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* @param string|DateTime $currentTime (optional) Relative calculation date
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* @param bool $invert (optional) Set to TRUE to retrieve previous dates
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* @param bool $allowCurrentDate (optional) Set to TRUE to return the
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* current date if it matches the cron expression
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*
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* @return array Returns an array of run dates
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*/
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public function getMultipleRunDates($total, $currentTime = 'now', $invert = false, $allowCurrentDate = false)
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{
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$matches = array();
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for ($i = 0; $i < max(0, $total); $i++) {
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$matches[] = $this->getRunDate($currentTime, $i, $invert, $allowCurrentDate);
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}
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return $matches;
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}
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/**
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* Get all or part of the CRON expression
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*
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* @param string $part (optional) Specify the part to retrieve or NULL to
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* get the full cron schedule string.
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*
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* @return string|null Returns the CRON expression, a part of the
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* CRON expression, or NULL if the part was specified but not found
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*/
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public function getExpression($part = null)
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{
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if (null === $part) {
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return implode(' ', $this->cronParts);
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} elseif (array_key_exists($part, $this->cronParts)) {
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return $this->cronParts[$part];
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}
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return null;
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}
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/**
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* Helper method to output the full expression.
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*
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* @return string Full CRON expression
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*/
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public function __toString()
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{
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return $this->getExpression();
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}
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/**
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* Determine if the cron is due to run based on the current date or a
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* specific date. This method assumes that the current number of
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* seconds are irrelevant, and should be called once per minute.
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*
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* @param string|DateTime $currentTime (optional) Relative calculation date
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*
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* @return bool Returns TRUE if the cron is due to run or FALSE if not
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*/
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public function isDue($currentTime = 'now')
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{
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if ('now' === $currentTime) {
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$currentDate = date('Y-m-d H:i');
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$currentTime = strtotime($currentDate);
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} elseif ($currentTime instanceof DateTime) {
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$currentDate = $currentTime->format('Y-m-d H:i');
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$currentTime = strtotime($currentDate);
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} else {
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$currentTime = new DateTime($currentTime);
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$currentTime->setTime($currentTime->format('H'), $currentTime->format('i'), 0);
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$currentDate = $currentTime->format('Y-m-d H:i');
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$currentTime = (int)($currentTime->getTimestamp());
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}
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return $this->getNextRunDate($currentDate, 0, true)->getTimestamp() == $currentTime;
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}
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/**
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* Get the next or previous run date of the expression relative to a date
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*
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* @param string|DateTime $currentTime (optional) Relative calculation date
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* @param int $nth (optional) Number of matches to skip before returning
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* @param bool $invert (optional) Set to TRUE to go backwards in time
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* @param bool $allowCurrentDate (optional) Set to TRUE to return the
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* current date if it matches the cron expression
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*
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* @return DateTime
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* @throws RuntimeException on too many iterations
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*/
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protected function getRunDate($currentTime = null, $nth = 0, $invert = false, $allowCurrentDate = false)
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{
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if ($currentTime instanceof DateTime) {
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$currentDate = $currentTime;
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} else {
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$currentDate = new DateTime($currentTime ? $currentTime : 'now');
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$currentDate->setTimezone(new DateTimeZone(date_default_timezone_get()));
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}
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$currentDate->setTime($currentDate->format('H'), $currentDate->format('i'), 0);
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$nextRun = clone $currentDate;
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$nth = (int) $nth;
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// Set a hard limit to bail on an impossible date
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for ($i = 0; $i < 1000; $i++) {
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foreach (self::$order as $position) {
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$part = $this->getExpression($position);
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if (null === $part) {
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continue;
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}
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$satisfied = false;
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// Get the field object used to validate this part
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$field = $this->fieldFactory->getField($position);
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// Check if this is singular or a list
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if (strpos($part, ',') === false) {
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$satisfied = $field->isSatisfiedBy($nextRun, $part);
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} else {
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foreach (array_map('trim', explode(',', $part)) as $listPart) {
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if ($field->isSatisfiedBy($nextRun, $listPart)) {
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$satisfied = true;
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break;
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}
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}
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}
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// If the field is not satisfied, then start over
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if (!$satisfied) {
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$field->increment($nextRun, $invert);
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continue 2;
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}
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}
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// Skip this match if needed
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if ((!$allowCurrentDate && $nextRun == $currentDate) || --$nth > -1) {
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$this->fieldFactory->getField(0)->increment($nextRun, $invert);
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continue;
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}
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return $nextRun;
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}
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// @codeCoverageIgnoreStart
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throw new RuntimeException('Impossible CRON expression');
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// @codeCoverageIgnoreEnd
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}
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}
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