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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Validator;
use DateInterval;
use DateTime;
use DateTimeZone;
use Traversable;
use Zend\Stdlib\ArrayUtils;
class DateStep extends Date
{
const NOT_STEP = 'dateStepNotStep';
const FORMAT_DEFAULT = DateTime::ISO8601;
/**
* @var array
*/
protected $messageTemplates = array(
self::INVALID => "Invalid type given. String, integer, array or DateTime expected",
self::INVALID_DATE => "The input does not appear to be a valid date",
self::FALSEFORMAT => "The input does not fit the date format '%format%'",
self::NOT_STEP => "The input is not a valid step",
);
/**
* Optional base date value
*
* @var string|int|\DateTime
*/
protected $baseValue = '1970-01-01T00:00:00Z';
/**
* Date step interval (defaults to 1 day).
* Uses the DateInterval specification.
*
* @var DateInterval
*/
protected $step;
/**
* Optional timezone to be used when the baseValue
* and validation values do not contain timezone info
*
* @var DateTimeZone
*/
protected $timezone;
/**
* Set default options for this instance
*
* @param array $options
*/
public function __construct($options = array())
{
if ($options instanceof Traversable) {
$options = ArrayUtils::iteratorToArray($options);
} elseif (!is_array($options)) {
$options = func_get_args();
$temp['baseValue'] = array_shift($options);
if (!empty($options)) {
$temp['step'] = array_shift($options);
}
if (!empty($options)) {
$temp['format'] = array_shift($options);
}
if (!empty($options)) {
$temp['timezone'] = array_shift($options);
}
$options = $temp;
}
if (!isset($options['step'])) {
$options['step'] = new DateInterval('P1D');
}
if (!isset($options['timezone'])) {
$options['timezone'] = new DateTimeZone(date_default_timezone_get());
}
parent::__construct($options);
}
/**
* Sets the base value from which the step should be computed
*
* @param string|int|\DateTime $baseValue
* @return DateStep
*/
public function setBaseValue($baseValue)
{
$this->baseValue = $baseValue;
return $this;
}
/**
* Returns the base value from which the step should be computed
*
* @return string|int|\DateTime
*/
public function getBaseValue()
{
return $this->baseValue;
}
/**
* Sets the step date interval
*
* @param DateInterval $step
* @return DateStep
*/
public function setStep(DateInterval $step)
{
$this->step = $step;
return $this;
}
/**
* Returns the step date interval
*
* @return DateInterval
*/
public function getStep()
{
return $this->step;
}
/**
* Returns the timezone option
*
* @return DateTimeZone
*/
public function getTimezone()
{
return $this->timezone;
}
/**
* Sets the timezone option
*
* @param DateTimeZone $timezone
* @return DateStep
*/
public function setTimezone(DateTimeZone $timezone)
{
$this->timezone = $timezone;
return $this;
}
/**
* Supports formats with ISO week (W) definitions
*
* @see Date::convertString()
*/
protected function convertString($value, $addErrors = true)
{
// Custom week format support
if (strpos($this->format, 'Y-\WW') === 0
&& preg_match('/^([0-9]{4})\-W([0-9]{2})/', $value, $matches)
) {
$date = new DateTime;
$date->setISODate($matches[1], $matches[2]);
} else {
$date = DateTime::createFromFormat($this->format, $value, $this->timezone);
}
// Invalid dates can show up as warnings (ie. "2007-02-99")
// and still return a DateTime object.
$errors = DateTime::getLastErrors();
if ($errors['warning_count'] > 0) {
if ($addErrors) {
$this->error(self::FALSEFORMAT);
}
return false;
}
return $date;
}
/**
* Returns true if a date is within a valid step
*
* @param string|int|\DateTime $value
* @return bool
* @throws Exception\InvalidArgumentException
*/
public function isValid($value)
{
if (!parent::isValid($value)) {
return false;
}
$valueDate = $this->convertToDateTime($value, false); // avoid duplicate errors
$baseDate = $this->convertToDateTime($this->baseValue, false);
$step = $this->getStep();
// Same date?
if ($valueDate == $baseDate) {
return true;
}
// Optimization for simple intervals.
// Handle intervals of just one date or time unit.
$intervalParts = explode('|', $step->format('%y|%m|%d|%h|%i|%s'));
$partCounts = array_count_values($intervalParts);
$unitKeys = array('years', 'months', 'days', 'hours', 'minutes', 'seconds');
$intervalParts = array_combine($unitKeys, $intervalParts);
// Get absolute time difference to avoid special cases of missing/added time
$absoluteValueDate = new DateTime($valueDate->format('Y-m-d H:i:s'), new DateTimeZone('UTC'));
$absoluteBaseDate = new DateTime($baseDate->format('Y-m-d H:i:s'), new DateTimeZone('UTC'));
$timeDiff = $absoluteValueDate->diff($absoluteBaseDate, 1);
$diffParts = array_combine($unitKeys, explode('|', $timeDiff->format('%y|%m|%d|%h|%i|%s')));
if (5 === $partCounts["0"]) {
// Find the unit with the non-zero interval
$intervalUnit = null;
$stepValue = null;
foreach ($intervalParts as $key => $value) {
if (0 != $value) {
$intervalUnit = $key;
$stepValue = (int) $value;
break;
}
}
// Check date units
if (in_array($intervalUnit, array('years', 'months', 'days'))) {
switch ($intervalUnit) {
case 'years':
if (0 == $diffParts['months'] && 0 == $diffParts['days']
&& 0 == $diffParts['hours'] && 0 == $diffParts['minutes']
&& 0 == $diffParts['seconds']
) {
if (($diffParts['years'] % $stepValue) === 0) {
return true;
}
}
break;
case 'months':
if (0 == $diffParts['days'] && 0 == $diffParts['hours']
&& 0 == $diffParts['minutes'] && 0 == $diffParts['seconds']
) {
$months = ($diffParts['years'] * 12) + $diffParts['months'];
if (($months % $stepValue) === 0) {
return true;
}
}
break;
case 'days':
if (0 == $diffParts['hours'] && 0 == $diffParts['minutes']
&& 0 == $diffParts['seconds']
) {
$days = $timeDiff->format('%a'); // Total days
if (($days % $stepValue) === 0) {
return true;
}
}
break;
}
$this->error(self::NOT_STEP);
return false;
}
// Check time units
if (in_array($intervalUnit, array('hours', 'minutes', 'seconds'))) {
// Simple test if $stepValue is 1.
if (1 == $stepValue) {
if ('hours' === $intervalUnit
&& 0 == $diffParts['minutes'] && 0 == $diffParts['seconds']
) {
return true;
} elseif ('minutes' === $intervalUnit && 0 == $diffParts['seconds']) {
return true;
} elseif ('seconds' === $intervalUnit) {
return true;
}
$this->error(self::NOT_STEP);
return false;
}
// Simple test for same day, when using default baseDate
if ($baseDate->format('Y-m-d') == $valueDate->format('Y-m-d')
&& $baseDate->format('Y-m-d') == '1970-01-01'
) {
switch ($intervalUnit) {
case 'hours':
if (0 == $diffParts['minutes'] && 0 == $diffParts['seconds']) {
if (($diffParts['hours'] % $stepValue) === 0) {
return true;
}
}
break;
case 'minutes':
if (0 == $diffParts['seconds']) {
$minutes = ($diffParts['hours'] * 60) + $diffParts['minutes'];
if (($minutes % $stepValue) === 0) {
return true;
}
}
break;
case 'seconds':
$seconds = ($diffParts['hours'] * 60 * 60)
+ ($diffParts['minutes'] * 60)
+ $diffParts['seconds'];
if (($seconds % $stepValue) === 0) {
return true;
}
break;
}
$this->error(self::NOT_STEP);
return false;
}
}
}
return $this->fallbackIncrementalIterationLogic($baseDate, $valueDate, $intervalParts, $diffParts, $step);
}
/**
* Fall back to slower (but accurate) method for complex intervals.
* Keep adding steps to the base date until a match is found
* or until the value is exceeded.
*
* This is really slow if the interval is small, especially if the
* default base date of 1/1/1970 is used. We can skip a chunk of
* iterations by starting at the lower bound of steps needed to reach
* the target
*
* @param DateTime $baseDate
* @param DateTime $valueDate
* @param int[] $intervalParts
* @param int[] $diffParts
* @param DateInterval $step
*
* @return bool
*/
private function fallbackIncrementalIterationLogic(
DateTime $baseDate,
DateTime $valueDate,
array $intervalParts,
array $diffParts,
DateInterval $step
) {
list($minSteps, $requiredIterations) = $this->computeMinStepAndRequiredIterations($intervalParts, $diffParts);
$minimumInterval = $this->computeMinimumInterval($intervalParts, $minSteps);
$isIncrementalStepping = $baseDate < $valueDate;
$dateModificationOperation = $isIncrementalStepping ? 'add' : 'sub';
for ($offsetIterations = 0; $offsetIterations < $requiredIterations; $offsetIterations += 1) {
$baseDate->{$dateModificationOperation}($minimumInterval);
}
while (($isIncrementalStepping && $baseDate < $valueDate)
|| (! $isIncrementalStepping && $baseDate > $valueDate)
) {
$baseDate->{$dateModificationOperation}($step);
if ($baseDate == $valueDate) {
return true;
}
}
$this->error(self::NOT_STEP);
return false;
}
/**
* Computes minimum interval to use for iterations while checking steps
*
* @param int[] $intervalParts
* @param int $minSteps
*
* @return DateInterval
*/
private function computeMinimumInterval(array $intervalParts, $minSteps)
{
return new DateInterval(sprintf(
'P%dY%dM%dDT%dH%dM%dS',
$intervalParts['years'] * $minSteps,
$intervalParts['months'] * $minSteps,
$intervalParts['days'] * $minSteps,
$intervalParts['hours'] * $minSteps,
$intervalParts['minutes'] * $minSteps,
$intervalParts['seconds'] * $minSteps
));
}
/**
* @param int[] $intervalParts
* @param int[] $diffParts
*
* @return int[] (ordered tuple containing minimum steps and required step iterations
*/
private function computeMinStepAndRequiredIterations(array $intervalParts, array $diffParts)
{
$minSteps = $this->computeMinSteps($intervalParts, $diffParts);
// If we use PHP_INT_MAX DateInterval::__construct falls over with a bad format error
// before we reach the max on 64 bit machines
$maxInteger = min(pow(2, 31), PHP_INT_MAX);
// check for integer overflow and split $minimum interval if needed
$maximumInterval = max($intervalParts);
$requiredStepIterations = 1;
if (($minSteps * $maximumInterval) > $maxInteger) {
$requiredStepIterations = ceil(($minSteps * $maximumInterval) / $maxInteger);
$minSteps = floor($minSteps / $requiredStepIterations);
}
return array($minSteps, $minSteps ? $requiredStepIterations : 0);
}
/**
* Multiply the step interval by the lower bound of steps to reach the target
*
* @param int[] $intervalParts
* @param int[] $diffParts
*
* @return int
*/
private function computeMinSteps(array $intervalParts, array $diffParts)
{
$intervalMaxSeconds = $this->computeIntervalMaxSeconds($intervalParts);
return (0 == $intervalMaxSeconds)
? 0
: max(floor($this->computeDiffMinSeconds($diffParts) / $intervalMaxSeconds) - 1, 0);
}
/**
* Get upper bound of the given interval in seconds
* Converts a given `$intervalParts` array into seconds
*
* @param int[] $intervalParts
*
* @return int
*/
private function computeIntervalMaxSeconds(array $intervalParts)
{
return ($intervalParts['years'] * 60 * 60 * 24 * 366)
+ ($intervalParts['months'] * 60 * 60 * 24 * 31)
+ ($intervalParts['days'] * 60 * 60 * 24)
+ ($intervalParts['hours'] * 60 * 60)
+ ($intervalParts['minutes'] * 60)
+ $intervalParts['seconds'];
}
/**
* Get lower bound of difference in secondss
* Converts a given `$diffParts` array into seconds
*
* @param int[] $diffParts
*
* @return int
*/
private function computeDiffMinSeconds(array $diffParts)
{
return ($diffParts['years'] * 60 * 60 * 24 * 365)
+ ($diffParts['months'] * 60 * 60 * 24 * 28)
+ ($diffParts['days'] * 60 * 60 * 24)
+ ($diffParts['hours'] * 60 * 60)
+ ($diffParts['minutes'] * 60)
+ $diffParts['seconds'];
}
}
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