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<?php
declare(strict_types=1);
namespace Money;
use InvalidArgumentException;
use function abs;
use function explode;
use function is_int;
use function ltrim;
use function min;
use function rtrim;
use function sprintf;
use function str_pad;
use function strlen;
use function substr;
/**
* Represents a numeric value.
*
* @internal this is an internal utility of the library, and may vary at any time. It is mostly used to internally validate
* that a number is represented at digits, but by improving type system integration, we may be able to completely
* get rid of it.
*
* @psalm-immutable
*/
final class Number
{
/** @psalm-var numeric-string */
private string $integerPart;
/** @psalm-var numeric-string|'' */
private string $fractionalPart;
private const NUMBERS = [0 => 1, 1 => 1, 2 => 1, 3 => 1, 4 => 1, 5 => 1, 6 => 1, 7 => 1, 8 => 1, 9 => 1];
public function __construct(string $integerPart, string $fractionalPart = '')
{
if ($integerPart === '' && $fractionalPart === '') {
throw new InvalidArgumentException('Empty number is invalid');
}
$this->integerPart = self::parseIntegerPart($integerPart);
$this->fractionalPart = self::parseFractionalPart($fractionalPart);
}
/** @psalm-pure */
public static function fromString(string $number): self
{
$portions = explode('.', $number, 2);
return new self(
$portions[0],
rtrim($portions[1] ?? '', '0')
);
}
/** @psalm-pure */
public static function fromFloat(float $number): self
{
return self::fromString(sprintf('%.14F', $number));
}
/** @psalm-pure */
public static function fromNumber(int|string $number): self
{
if (is_int($number)) {
return new self((string) $number);
}
return self::fromString($number);
}
public function isDecimal(): bool
{
return $this->fractionalPart !== '';
}
public function isInteger(): bool
{
return $this->fractionalPart === '';
}
public function isHalf(): bool
{
return $this->fractionalPart === '5';
}
public function isCurrentEven(): bool
{
$lastIntegerPartNumber = (int) $this->integerPart[strlen($this->integerPart) - 1];
return $lastIntegerPartNumber % 2 === 0;
}
public function isCloserToNext(): bool
{
if ($this->fractionalPart === '') {
return false;
}
return $this->fractionalPart[0] >= 5;
}
/** @psalm-return numeric-string */
public function __toString(): string
{
if ($this->fractionalPart === '') {
return $this->integerPart;
}
/** @psalm-suppress LessSpecificReturnStatement this operation is guaranteed to pruduce a numeric-string, but inference can't understand it */
return $this->integerPart . '.' . $this->fractionalPart;
}
public function isNegative(): bool
{
return $this->integerPart[0] === '-';
}
/** @psalm-return numeric-string */
public function getIntegerPart(): string
{
return $this->integerPart;
}
/** @psalm-return numeric-string|'' */
public function getFractionalPart(): string
{
return $this->fractionalPart;
}
/** @psalm-return numeric-string */
public function getIntegerRoundingMultiplier(): string
{
if ($this->integerPart[0] === '-') {
return '-1';
}
return '1';
}
public function base10(int $number): self
{
if ($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)
);
}
/**
* @psalm-return numeric-string
*
* @psalm-pure
*
* @psalm-suppress MoreSpecificReturnType this operation is guaranteed to pruduce a numeric-string, but inference can't understand it
* @psalm-suppress LessSpecificReturnStatement this operation is guaranteed to pruduce a numeric-string, but inference can't understand it
*/
private static function parseIntegerPart(string $number): string
{
if ($number === '' || $number === '0') {
return '0';
}
if ($number === '-') {
return '-0';
}
// Happy path performance optimization: number can be used as-is if it is within
// the platform's integer capabilities.
if ($number === (string) (int) $number) {
return $number;
}
$nonZero = false;
for ($position = 0, $characters = strlen($number); $position < $characters; ++$position) {
$digit = $number[$position];
/** @psalm-suppress InvalidArrayOffset we are, on purpose, checking if the digit is valid against a fixed structure */
if (! isset(self::NUMBERS[$digit]) && ! ($position === 0 && $digit === '-')) {
throw new InvalidArgumentException(sprintf('Invalid integer part %1$s. Invalid digit %2$s found', $number, $digit));
}
if ($nonZero === false && $digit === '0') {
throw new InvalidArgumentException('Leading zeros are not allowed');
}
$nonZero = true;
}
return $number;
}
/**
* @psalm-return numeric-string|''
*
* @psalm-pure
*/
private static function parseFractionalPart(string $number): string
{
if ($number === '') {
return $number;
}
$intFraction = (int) $number;
// Happy path performance optimization: number can be used as-is if it is within
// the platform's integer capabilities, and it starts with zeroes only.
if ($intFraction > 0 && ltrim($number, '0') === (string) $intFraction) {
return $number;
}
for ($position = 0, $characters = strlen($number); $position < $characters; ++$position) {
$digit = $number[$position];
/** @psalm-suppress InvalidArrayOffset we are, on purpose, checking if the digit is valid against a fixed structure */
if (! isset(self::NUMBERS[$digit])) {
throw new InvalidArgumentException(sprintf('Invalid fractional part %1$s. Invalid digit %2$s found', $number, $digit));
}
}
return $number;
}
/**
* @psalm-pure
* @psalm-suppress InvalidOperand string and integers get concatenated here - that is by design, as we're computing remainders
*/
public static function roundMoneyValue(string $moneyValue, int $targetDigits, int $havingDigits): string
{
$valueLength = strlen($moneyValue);
$shouldRound = $targetDigits < $havingDigits && $valueLength - $havingDigits + $targetDigits > 0;
if ($shouldRound && $moneyValue[$valueLength - $havingDigits + $targetDigits] >= 5) {
$position = $valueLength - $havingDigits + $targetDigits;
/** @psalm-var positive-int|0 $addend */
$addend = 1;
while ($position > 0) {
$newValue = (string) ((int) $moneyValue[$position - 1] + $addend);
if ($newValue >= 10) {
$moneyValue[$position - 1] = $newValue[1];
/** @psalm-var numeric-string $addend */
$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;
}
}