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<?php
namespace Cron;
/**
* Abstract CRON expression field
*/
abstract class AbstractField implements FieldInterface
{
/**
* Check to see if a field is satisfied by a value
*
* @param string $dateValue Date value to check
* @param string $value Value to test
*
* @return bool
*/
public function isSatisfied($dateValue, $value)
{
if ($this->isIncrementsOfRanges($value)) {
return $this->isInIncrementsOfRanges($dateValue, $value);
} elseif ($this->isRange($value)) {
return $this->isInRange($dateValue, $value);
}
return $value == '*' || $dateValue == $value;
}
/**
* Check if a value is a range
*
* @param string $value Value to test
*
* @return bool
*/
public function isRange($value)
{
return strpos($value, '-') !== false;
}
/**
* Check if a value is an increments of ranges
*
* @param string $value Value to test
*
* @return bool
*/
public function isIncrementsOfRanges($value)
{
return strpos($value, '/') !== false;
}
/**
* Test if a value is within a range
*
* @param string $dateValue Set date value
* @param string $value Value to test
*
* @return bool
*/
public function isInRange($dateValue, $value)
{
$parts = array_map('trim', explode('-', $value, 2));
return $dateValue >= $parts[0] && $dateValue <= $parts[1];
}
/**
* Test if a value is within an increments of ranges (offset[-to]/step size)
*
* @param string $dateValue Set date value
* @param string $value Value to test
*
* @return bool
*/
public function isInIncrementsOfRanges($dateValue, $value)
{
$parts = array_map('trim', explode('/', $value, 2));
$stepSize = isset($parts[1]) ? (int) $parts[1] : 0;
if ($stepSize === 0) {
return false;
}
if (($parts[0] == '*' || $parts[0] === '0')) {
return (int) $dateValue % $stepSize == 0;
}
$range = explode('-', $parts[0], 2);
$offset = $range[0];
$to = isset($range[1]) ? $range[1] : $dateValue;
// Ensure that the date value is within the range
if ($dateValue < $offset || $dateValue > $to) {
return false;
}
if ($dateValue > $offset && 0 === $stepSize) {
return false;
}
for ($i = $offset; $i <= $to; $i+= $stepSize) {
if ($i == $dateValue) {
return true;
}
}
return false;
}
/**
* Returns a range of values for the given cron expression
*
* @param string $expression The expression to evaluate
* @param int $max Maximum offset for range
*
* @return array
*/
public function getRangeForExpression($expression, $max)
{
$values = array();
if ($this->isRange($expression) || $this->isIncrementsOfRanges($expression)) {
if (!$this->isIncrementsOfRanges($expression)) {
list ($offset, $to) = explode('-', $expression);
$stepSize = 1;
}
else {
$range = array_map('trim', explode('/', $expression, 2));
$stepSize = isset($range[1]) ? $range[1] : 0;
$range = $range[0];
$range = explode('-', $range, 2);
$offset = $range[0];
$to = isset($range[1]) ? $range[1] : $max;
}
$offset = $offset == '*' ? 0 : $offset;
for ($i = $offset; $i <= $to; $i += $stepSize) {
$values[] = $i;
}
sort($values);
}
else {
$values = array($expression);
}
return $values;
}
}