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<?php
/**
* This file is part of the Carbon package.
*
* (c) Brian Nesbitt <brian@nesbot.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Carbon\Traits;
use Carbon\CarbonInterface;
use Carbon\Exceptions\UnknownUnitException;
/**
* Trait Rounding.
*
* Round, ceil, floor units.
*
* Depends on the following methods:
*
* @method static copy()
* @method static startOfWeek(int $weekStartsAt = null)
*/
trait Rounding
{
use IntervalRounding;
/**
* Round the current instance at the given unit with given precision if specified and the given function.
*
* @param string $unit
* @param float|int $precision
* @param string $function
*
* @return CarbonInterface
*/
public function roundUnit($unit, $precision = 1, $function = 'round')
{
$metaUnits = [
// @call roundUnit
'millennium' => [static::YEARS_PER_MILLENNIUM, 'year'],
// @call roundUnit
'century' => [static::YEARS_PER_CENTURY, 'year'],
// @call roundUnit
'decade' => [static::YEARS_PER_DECADE, 'year'],
// @call roundUnit
'quarter' => [static::MONTHS_PER_QUARTER, 'month'],
// @call roundUnit
'millisecond' => [1000, 'microsecond'],
];
$normalizedUnit = static::singularUnit($unit);
$ranges = array_merge(static::getRangesByUnit($this->daysInMonth), [
// @call roundUnit
'microsecond' => [0, 999999],
]);
$factor = 1;
$initialMonth = $this->month;
if ($normalizedUnit === 'week') {
$normalizedUnit = 'day';
$precision *= static::DAYS_PER_WEEK;
}
if (isset($metaUnits[$normalizedUnit])) {
[$factor, $normalizedUnit] = $metaUnits[$normalizedUnit];
}
$precision *= $factor;
if (!isset($ranges[$normalizedUnit])) {
throw new UnknownUnitException($unit);
}
$found = false;
$fraction = 0;
$arguments = null;
$initialValue = null;
$factor = $this->year < 0 ? -1 : 1;
$changes = [];
$minimumInc = null;
foreach ($ranges as $unit => [$minimum, $maximum]) {
if ($normalizedUnit === $unit) {
$arguments = [$this->$unit, $minimum];
$initialValue = $this->$unit;
$fraction = $precision - floor($precision);
$found = true;
continue;
}
if ($found) {
$delta = $maximum + 1 - $minimum;
$factor /= $delta;
$fraction *= $delta;
$inc = ($this->$unit - $minimum) * $factor;
if ($inc !== 0.0) {
$minimumInc = $minimumInc ?? ($arguments[0] / pow(2, 52));
// If value is still the same when adding a non-zero increment/decrement,
// it means precision got lost in the addition
if (abs($inc) < $minimumInc) {
$inc = $minimumInc * ($inc < 0 ? -1 : 1);
}
// If greater than $precision, assume precision loss caused an overflow
if ($function !== 'floor' || abs($arguments[0] + $inc - $initialValue) >= $precision) {
$arguments[0] += $inc;
}
}
$changes[$unit] = round(
$minimum + ($fraction ? $fraction * $function(($this->$unit - $minimum) / $fraction) : 0)
);
// Cannot use modulo as it lose double precision
while ($changes[$unit] >= $delta) {
$changes[$unit] -= $delta;
}
$fraction -= floor($fraction);
}
}
[$value, $minimum] = $arguments;
$normalizedValue = floor($function(($value - $minimum) / $precision) * $precision + $minimum);
/** @var CarbonInterface $result */
$result = $this->$normalizedUnit($normalizedValue);
foreach ($changes as $unit => $value) {
$result = $result->$unit($value);
}
return $normalizedUnit === 'month' && $precision <= 1 && abs($result->month - $initialMonth) === 2
// Re-run the change in case an overflow occurred
? $result->$normalizedUnit($normalizedValue)
: $result;
}
/**
* Truncate the current instance at the given unit with given precision if specified.
*
* @param string $unit
* @param float|int $precision
*
* @return CarbonInterface
*/
public function floorUnit($unit, $precision = 1)
{
return $this->roundUnit($unit, $precision, 'floor');
}
/**
* Ceil the current instance at the given unit with given precision if specified.
*
* @param string $unit
* @param float|int $precision
*
* @return CarbonInterface
*/
public function ceilUnit($unit, $precision = 1)
{
return $this->roundUnit($unit, $precision, 'ceil');
}
/**
* Round the current instance second with given precision if specified.
*
* @param float|int|string|\DateInterval|null $precision
* @param string $function
*
* @return CarbonInterface
*/
public function round($precision = 1, $function = 'round')
{
return $this->roundWith($precision, $function);
}
/**
* Round the current instance second with given precision if specified.
*
* @param float|int|string|\DateInterval|null $precision
*
* @return CarbonInterface
*/
public function floor($precision = 1)
{
return $this->round($precision, 'floor');
}
/**
* Ceil the current instance second with given precision if specified.
*
* @param float|int|string|\DateInterval|null $precision
*
* @return CarbonInterface
*/
public function ceil($precision = 1)
{
return $this->round($precision, 'ceil');
}
/**
* Round the current instance week.
*
* @param int $weekStartsAt optional start allow you to specify the day of week to use to start the week
*
* @return CarbonInterface
*/
public function roundWeek($weekStartsAt = null)
{
return $this->closest(
$this->avoidMutation()->floorWeek($weekStartsAt),
$this->avoidMutation()->ceilWeek($weekStartsAt)
);
}
/**
* Truncate the current instance week.
*
* @param int $weekStartsAt optional start allow you to specify the day of week to use to start the week
*
* @return CarbonInterface
*/
public function floorWeek($weekStartsAt = null)
{
return $this->startOfWeek($weekStartsAt);
}
/**
* Ceil the current instance week.
*
* @param int $weekStartsAt optional start allow you to specify the day of week to use to start the week
*
* @return CarbonInterface
*/
public function ceilWeek($weekStartsAt = null)
{
if ($this->isMutable()) {
$startOfWeek = $this->avoidMutation()->startOfWeek($weekStartsAt);
return $startOfWeek != $this ?
$this->startOfWeek($weekStartsAt)->addWeek() :
$this;
}
$startOfWeek = $this->startOfWeek($weekStartsAt);
return $startOfWeek != $this ?
$startOfWeek->addWeek() :
$this->avoidMutation();
}
}
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