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ChooseGenerator.php
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ChooseGenerator.php
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<?php
namespace Eris\Generator;
use Eris\Generator;
use Eris\Generators;
use InvalidArgumentException;
use Eris\Random\RandomRange;
if (!defined('ERIS_PHP_INT_MIN')) {
define('ERIS_PHP_INT_MIN', ~PHP_INT_MAX);
}
/**
* Generates a number in the range from the lower bound to the upper bound,
* inclusive. The result shrinks towards smaller absolute values.
* The order of the parameters does not care since they are re-ordered by the
* generator itself.
*
* @param $x int One of the 2 boundaries of the range
* @param $y int The other boundary of the range
* @return Generator\ChooseGenerator
*/
function choose($lowerLimit, $upperLimit)
{
return Generators::choose($lowerLimit, $upperLimit);
}
/**
* @template-implements Generator<int>
*/
class ChooseGenerator implements Generator
{
private $lowerLimit;
private $upperLimit;
private $shrinkTarget;
public function __construct($x, $y)
{
$this->checkLimits($x, $y);
$this->lowerLimit = min($x, $y);
$this->upperLimit = max($x, $y);
$this->shrinkTarget = min(
abs($this->lowerLimit),
abs($this->upperLimit)
);
}
public function __invoke($_size, RandomRange $rand)
{
$value = $rand->rand($this->lowerLimit, $this->upperLimit);
return GeneratedValueSingle::fromJustValue($value, 'choose');
}
public function shrink(GeneratedValue $element)
{
if ($element->input() > $this->shrinkTarget) {
return GeneratedValueSingle::fromJustValue($element->input() - 1);
}
if ($element->input() < $this->shrinkTarget) {
return GeneratedValueSingle::fromJustValue($element->input() + 1);
}
return $element;
}
private function checkLimits($lowerLimit, $upperLimit)
{
// TODO: the problem with the random number generator is still here.
if ((!is_int($lowerLimit)) || (!is_int($upperLimit))) {
throw new InvalidArgumentException(
'lowerLimit (' . var_export($lowerLimit, true) . ') and ' .
'upperLimit (' . var_export($upperLimit, true) . ') should ' .
'be Integers between ' . ERIS_PHP_INT_MIN . ' and ' . PHP_INT_MAX
);
}
}
}

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text/x-php
Expires
Oct 5 2026, 02:34 (5 w, 6 d ago)
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f9/94/1b81d2c51b6a05c853dd3b3cbe18
Default Alt Text
ChooseGenerator.php (2 KB)

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