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<?php
namespace Money;
/**
* Represents a numeric value.
*
* @author Frederik Bosch <f.bosch@genkgo.nl>
*/
final class Number
{
/**
* @var string
*/
private $integerPart;
/**
* @var string
*/
private $fractionalPart;
/**
* @var array
*/
private static $numbers = [0 => 1, 1 => 1, 2 => 1, 3 => 1, 4 => 1, 5 => 1, 6 => 1, 7 => 1, 8 => 1, 9 => 1];
/**
* @param string $integerPart
* @param string $fractionalPart
*/
public function __construct($integerPart, $fractionalPart = '')
{
if ('' === $integerPart && '' === $fractionalPart) {
throw new \InvalidArgumentException('Empty number is invalid');
}
$this->integerPart = $this->parseIntegerPart((string) $integerPart);
$this->fractionalPart = $this->parseFractionalPart((string) $fractionalPart);
}
/**
* @param $number
*
* @return self
*/
public static function fromString($number)
{
$decimalSeparatorPosition = strpos($number, '.');
if ($decimalSeparatorPosition === false) {
return new self($number, '');
}
return new self(
substr($number, 0, $decimalSeparatorPosition),
rtrim(substr($number, $decimalSeparatorPosition + 1), '0')
);
}
/**
* @param float $number
*
* @return self
*/
public static function fromFloat($number)
{
if (is_float($number) === false) {
throw new \InvalidArgumentException('Floating point value expected');
}
return self::fromString(sprintf('%.14F', $number));
}
/**
* @param float|int|string $number
*
* @return self
*/
public static function fromNumber($number)
{
if (is_float($number)) {
return self::fromString(sprintf('%.14F', $number));
}
if (is_int($number)) {
return new self($number);
}
if (is_string($number)) {
return self::fromString($number);
}
throw new \InvalidArgumentException('Valid numeric value expected');
}
/**
* @return bool
*/
public function isDecimal()
{
return $this->fractionalPart !== '';
}
/**
* @return bool
*/
public function isInteger()
{
return $this->fractionalPart === '';
}
/**
* @return bool
*/
public function isHalf()
{
return $this->fractionalPart === '5';
}
/**
* @return bool
*/
public function isCurrentEven()
{
$lastIntegerPartNumber = $this->integerPart[strlen($this->integerPart) - 1];
return $lastIntegerPartNumber % 2 === 0;
}
/**
* @return bool
*/
public function isCloserToNext()
{
if ($this->fractionalPart === '') {
return false;
}
return $this->fractionalPart[0] >= 5;
}
/**
* @return string
*/
public function __toString()
{
if ($this->fractionalPart === '') {
return $this->integerPart;
}
return $this->integerPart.'.'.$this->fractionalPart;
}
/**
* @return bool
*/
public function isNegative()
{
return $this->integerPart[0] === '-';
}
/**
* @return string
*/
public function getIntegerPart()
{
return $this->integerPart;
}
/**
* @return string
*/
public function getFractionalPart()
{
return $this->fractionalPart;
}
/**
* @return string
*/
public function getIntegerRoundingMultiplier()
{
if ($this->integerPart[0] === '-') {
return '-1';
}
return '1';
}
/**
* @param int $number
*
* @return self
*/
public function base10($number)
{
if (!is_int($number)) {
throw new \InvalidArgumentException('Expecting integer');
}
if ($this->integerPart === '0' && !$this->fractionalPart) {
return $this;
}
$sign = '';
$integerPart = $this->integerPart;
if ($integerPart[0] === '-') {
$sign = '-';
$integerPart = substr($integerPart, 1);
}
if ($number >= 0) {
$integerPart = ltrim($integerPart, '0');
$lengthIntegerPart = strlen($integerPart);
$integers = $lengthIntegerPart - min($number, $lengthIntegerPart);
$zeroPad = $number - min($number, $lengthIntegerPart);
return new self(
$sign.substr($integerPart, 0, $integers),
rtrim(str_pad('', $zeroPad, '0').substr($integerPart, $integers).$this->fractionalPart, '0')
);
}
$number = abs($number);
$lengthFractionalPart = strlen($this->fractionalPart);
$fractions = $lengthFractionalPart - min($number, $lengthFractionalPart);
$zeroPad = $number - min($number, $lengthFractionalPart);
return new self(
$sign.ltrim($integerPart.substr($this->fractionalPart, 0, $lengthFractionalPart - $fractions).str_pad('', $zeroPad, '0'), '0'),
substr($this->fractionalPart, $lengthFractionalPart - $fractions)
);
}
/**
* @param string $number
*
* @return string
*/
private static function parseIntegerPart($number)
{
if ('' === $number || '0' === $number) {
return '0';
}
if ('-' === $number) {
return '-0';
}
$nonZero = false;
for ($position = 0, $characters = strlen($number); $position < $characters; ++$position) {
$digit = $number[$position];
if (!isset(static::$numbers[$digit]) && !(0 === $position && '-' === $digit)) {
throw new \InvalidArgumentException(sprintf('Invalid integer part %1$s. Invalid digit %2$s found', $number, $digit));
}
if (false === $nonZero && '0' === $digit) {
throw new \InvalidArgumentException('Leading zeros are not allowed');
}
$nonZero = true;
}
return $number;
}
/**
* @param string $number
*
* @return string
*/
private static function parseFractionalPart($number)
{
if ('' === $number) {
return $number;
}
for ($position = 0, $characters = strlen($number); $position < $characters; ++$position) {
$digit = $number[$position];
if (!isset(static::$numbers[$digit])) {
throw new \InvalidArgumentException(sprintf('Invalid fractional part %1$s. Invalid digit %2$s found', $number, $digit));
}
}
return $number;
}
/**
* @param string $moneyValue
* @param int $targetDigits
* @param int $havingDigits
*
* @return string
*/
public static function roundMoneyValue($moneyValue, $targetDigits, $havingDigits)
{
$valueLength = strlen($moneyValue);
$shouldRound = $targetDigits < $havingDigits && $valueLength - $havingDigits + $targetDigits > 0;
if ($shouldRound && $moneyValue[$valueLength - $havingDigits + $targetDigits] >= 5) {
$position = $valueLength - $havingDigits + $targetDigits;
$addend = 1;
while ($position > 0) {
$newValue = (string) ((int) $moneyValue[$position - 1] + $addend);
if ($newValue >= 10) {
$moneyValue[$position - 1] = $newValue[1];
$addend = $newValue[0];
--$position;
if ($position === 0) {
$moneyValue = $addend.$moneyValue;
}
} else {
if ($moneyValue[$position - 1] === '-') {
$moneyValue[$position - 1] = $newValue[0];
$moneyValue = '-'.$moneyValue;
} else {
$moneyValue[$position - 1] = $newValue[0];
}
break;
}
}
}
return $moneyValue;
}
}