%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
namespace Yuloh\BcCompPolyfill;
class BigNumber
{
/**
* @var string
*/
private $characteristic = '0';
/**
* @var int
*/
private $characteristicLength;
/**
* @var string
*/
private $mantissa = '';
/**
* @var boolean
*/
private $isNegative = false;
/**
* @param string $value
*/
public function __construct($value)
{
if (static::isNumeric($value)) {
$this->setValues($value);
}
}
/**
* @return boolean
*/
public function isNegative()
{
return $this->isNegative;
}
/**
* @return boolean
*/
public function isPositive()
{
return !$this->isNegative();
}
/**
* @return boolean
*/
public function isZero()
{
return $this->getCharacteristic() === '0' && $this->getMantissa() === '';
}
/**
* @return string
*/
public function getCharacteristic()
{
return $this->characteristic;
}
/**
* @return int
*/
public function getCharacteristicLength()
{
if (is_null($this->characteristicLength)) {
$this->characteristicLength = strlen($this->getCharacteristic());
}
return $this->characteristicLength;
}
/**
* @return string
*/
public function getMantissa()
{
return $this->mantissa;
}
/**
* @param string $value
*/
private function setValues($value)
{
if ($value[0] === '-') {
$this->isNegative = true;
$value = substr($value, 1);
}
$this->characteristic = static::parseCharacteristic($value);
$this->mantissa = static::parseMantissa($value);
}
/**
* @param string $value
* @return string
*/
private static function parseCharacteristic($value)
{
if (strpos($value, '.') !== false) {
$value = substr($value, 0, strpos($value, '.'));
}
return strlen($value) === 1 ? $value : ltrim($value, '0');
}
/**
* @param string $value
* @return string
*/
private static function parseMantissa($value)
{
if (($separatorPos = strrpos($value, '.')) === false) {
return '';
}
$value = substr($value, strrpos($value, '.') + 1);
return rtrim($value, '0');
}
/**
* @param string $value
* @return boolean
*/
private static function isNumeric($value)
{
// remove the last decimal separator only.
// If it has more decimal separators it's invalid.
$separatorPos = strrpos($value, '.');
if ($separatorPos !== false) {
$value = substr_replace($value, '', $separatorPos, 1);
}
return ctype_digit($value) || ($value[0] === '-' && ctype_digit(substr($value, 1)));
}
}
Zerion Mini Shell 1.0