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Edit File : BigNumber.php \| Size : 15.24 KB
<?php declare(strict_types=1); namespace Brick\Math; use Brick\Math\Exception\DivisionByZeroException; use Brick\Math\Exception\MathException; use Brick\Math\Exception\NumberFormatException; use Brick\Math\Exception\RoundingNecessaryException; /** * Common interface for arbitrary-precision rational numbers. * * @psalm-immutable / abstract class BigNumber implements \Serializable, \JsonSerializable { /* * The regular expression used to parse integer, decimal and rational numbers. / private const PARSE_REGEXP = '/^' . '(?<sign>[\-\+])?' . '(?:' . '(?:' . '(?<integral>[0-9]+)?' . '(?<point>\.)?' . '(?<fractional>[0-9]+)?' . '(?:[eE](?<exponent>[\-\+]?[0-9]+))?' . ')\|(?:' . '(?<numerator>[0-9]+)' . '\/?' . '(?<denominator>[0-9]+)' . ')' . ')' . '$/'; /* * Creates a BigNumber of the given value. * * The concrete return type is dependent on the given value, with the following rules: * * - BigNumber instances are returned as is * - integer numbers are returned as BigInteger * - floating point numbers are converted to a string then parsed as such * - strings containing a `/` character are returned as BigRational * - strings containing a `.` character or using an exponential notation are returned as BigDecimal * - strings containing only digits with an optional leading `+` or `-` sign are returned as BigInteger * * @throws NumberFormatException If the format of the number is not valid. * @throws DivisionByZeroException If the value represents a rational number with a denominator of zero. * * @psalm-pure / public static function of(BigNumber\|int\|float\|string $value) : BigNumber { if ($value instanceof BigNumber) { return $value; } if (\is_int($value)) { return new BigInteger((string) $value); } $value = \is_float($value) ? self::floatToString($value) : $value; $throw = static function() use ($value) : void { throw new NumberFormatException(\sprintf( 'The given value "%s" does not represent a valid number.', $value )); }; if (\preg_match(self::PARSE_REGEXP, $value, $matches) !== 1) { $throw(); } $getMatch = static fn(string $value): ?string => (($matches[$value] ?? '') !== '') ? $matches[$value] : null; $sign = $getMatch('sign'); $numerator = $getMatch('numerator'); $denominator = $getMatch('denominator'); if ($numerator !== null) { assert($denominator !== null); if ($sign !== null) { $numerator = $sign . $numerator; } $numerator = self::cleanUp($numerator); $denominator = self::cleanUp($denominator); if ($denominator === '0') { throw DivisionByZeroException::denominatorMustNotBeZero(); } return new BigRational( new BigInteger($numerator), new BigInteger($denominator), false ); } $point = $getMatch('point'); $integral = $getMatch('integral'); $fractional = $getMatch('fractional'); $exponent = $getMatch('exponent'); if ($integral === null && $fractional === null) { $throw(); } if ($integral === null) { $integral = '0'; } if ($point !== null \|\| $exponent !== null) { $fractional = ($fractional ?? ''); $exponent = ($exponent !== null) ? (int) $exponent : 0; if ($exponent === PHP_INT_MIN \|\| $exponent === PHP_INT_MAX) { throw new NumberFormatException('Exponent too large.'); } $unscaledValue = self::cleanUp(($sign ?? ''). $integral . $fractional); $scale = \strlen($fractional) - $exponent; if ($scale < 0) { if ($unscaledValue !== '0') { $unscaledValue .= \str_repeat('0', - $scale); } $scale = 0; } return new BigDecimal($unscaledValue, $scale); } $integral = self::cleanUp(($sign ?? '') . $integral); return new BigInteger($integral); } /* * Safely converts float to string, avoiding locale-dependent issues. * * @see https://github.com/brick/math/pull/20 * * @psalm-pure * @psalm-suppress ImpureFunctionCall / private static function floatToString(float $float) : string { $currentLocale = \setlocale(LC_NUMERIC, '0'); \setlocale(LC_NUMERIC, 'C'); $result = (string) $float; \setlocale(LC_NUMERIC, $currentLocale); return $result; } /* * Proxy method to access BigInteger's protected constructor from sibling classes. * * @internal * @psalm-pure / protected function newBigInteger(string $value) : BigInteger { return new BigInteger($value); } /* * Proxy method to access BigDecimal's protected constructor from sibling classes. * * @internal * @psalm-pure / protected function newBigDecimal(string $value, int $scale = 0) : BigDecimal { return new BigDecimal($value, $scale); } /* * Proxy method to access BigRational's protected constructor from sibling classes. * * @internal * @psalm-pure / protected function newBigRational(BigInteger $numerator, BigInteger $denominator, bool $checkDenominator) : BigRational { return new BigRational($numerator, $denominator, $checkDenominator); } /* * Returns the minimum of the given values. * * @param BigNumber\|int\|float\|string ...$values The numbers to compare. All the numbers need to be convertible * to an instance of the class this method is called on. * * @throws \InvalidArgumentException If no values are given. * @throws MathException If an argument is not valid. * * @psalm-suppress LessSpecificReturnStatement * @psalm-suppress MoreSpecificReturnType * @psalm-pure / public static function min(BigNumber\|int\|float\|string ...$values) : static { $min = null; foreach ($values as $value) { $value = static::of($value); if ($min === null \|\| $value->isLessThan($min)) { $min = $value; } } if ($min === null) { throw new \InvalidArgumentException(__METHOD__ . '() expects at least one value.'); } return $min; } /* * Returns the maximum of the given values. * * @param BigNumber\|int\|float\|string ...$values The numbers to compare. All the numbers need to be convertible * to an instance of the class this method is called on. * * @throws \InvalidArgumentException If no values are given. * @throws MathException If an argument is not valid. * * @psalm-suppress LessSpecificReturnStatement * @psalm-suppress MoreSpecificReturnType * @psalm-pure / public static function max(BigNumber\|int\|float\|string ...$values) : static { $max = null; foreach ($values as $value) { $value = static::of($value); if ($max === null \|\| $value->isGreaterThan($max)) { $max = $value; } } if ($max === null) { throw new \InvalidArgumentException(__METHOD__ . '() expects at least one value.'); } return $max; } /* * Returns the sum of the given values. * * @param BigNumber\|int\|float\|string ...$values The numbers to add. All the numbers need to be convertible * to an instance of the class this method is called on. * * @throws \InvalidArgumentException If no values are given. * @throws MathException If an argument is not valid. * * @psalm-pure / public static function sum(BigNumber\|int\|float\|string ...$values) : static { /* @var static\|null $sum / $sum = null; foreach ($values as $value) { $value = static::of($value); $sum = $sum === null ? $value : self::add($sum, $value); } if ($sum === null) { throw new \InvalidArgumentException(__METHOD__ . '() expects at least one value.'); } return $sum; } /* * Adds two BigNumber instances in the correct order to avoid a RoundingNecessaryException. * * @todo This could be better resolved by creating an abstract protected method in BigNumber, and leaving to * concrete classes the responsibility to perform the addition themselves or delegate it to the given number, * depending on their ability to perform the operation. This will also require a version bump because we're * potentially breaking custom BigNumber implementations (if any...) * * @psalm-pure / private static function add(BigNumber $a, BigNumber $b) : BigNumber { if ($a instanceof BigRational) { return $a->plus($b); } if ($b instanceof BigRational) { return $b->plus($a); } if ($a instanceof BigDecimal) { return $a->plus($b); } if ($b instanceof BigDecimal) { return $b->plus($a); } /* @var BigInteger $a / return $a->plus($b); } /* * Removes optional leading zeros and + sign from the given number. * * @param string $number The number, validated as a non-empty string of digits with optional leading sign. * * @psalm-pure / private static function cleanUp(string $number) : string { $firstChar = $number[0]; if ($firstChar === '+' \|\| $firstChar === '-') { $number = \substr($number, 1); } $number = \ltrim($number, '0'); if ($number === '') { return '0'; } if ($firstChar === '-') { return '-' . $number; } return $number; } /* * Checks if this number is equal to the given one. / public function isEqualTo(BigNumber\|int\|float\|string $that) : bool { return $this->compareTo($that) === 0; } /* * Checks if this number is strictly lower than the given one. / public function isLessThan(BigNumber\|int\|float\|string $that) : bool { return $this->compareTo($that) < 0; } /* * Checks if this number is lower than or equal to the given one. / public function isLessThanOrEqualTo(BigNumber\|int\|float\|string $that) : bool { return $this->compareTo($that) <= 0; } /* * Checks if this number is strictly greater than the given one. / public function isGreaterThan(BigNumber\|int\|float\|string $that) : bool { return $this->compareTo($that) > 0; } /* * Checks if this number is greater than or equal to the given one. / public function isGreaterThanOrEqualTo(BigNumber\|int\|float\|string $that) : bool { return $this->compareTo($that) >= 0; } /* * Checks if this number equals zero. / public function isZero() : bool { return $this->getSign() === 0; } /* * Checks if this number is strictly negative. / public function isNegative() : bool { return $this->getSign() < 0; } /* * Checks if this number is negative or zero. / public function isNegativeOrZero() : bool { return $this->getSign() <= 0; } /* * Checks if this number is strictly positive. / public function isPositive() : bool { return $this->getSign() > 0; } /* * Checks if this number is positive or zero. / public function isPositiveOrZero() : bool { return $this->getSign() >= 0; } /* * Returns the sign of this number. * * @return int -1 if the number is negative, 0 if zero, 1 if positive. / abstract public function getSign() : int; /* * Compares this number to the given one. * * @return int [-1,0,1] If `$this` is lower than, equal to, or greater than `$that`. * * @throws MathException If the number is not valid. / abstract public function compareTo(BigNumber\|int\|float\|string $that) : int; /* * Converts this number to a BigInteger. * * @throws RoundingNecessaryException If this number cannot be converted to a BigInteger without rounding. / abstract public function toBigInteger() : BigInteger; /* * Converts this number to a BigDecimal. * * @throws RoundingNecessaryException If this number cannot be converted to a BigDecimal without rounding. / abstract public function toBigDecimal() : BigDecimal; /* * Converts this number to a BigRational. / abstract public function toBigRational() : BigRational; /* * Converts this number to a BigDecimal with the given scale, using rounding if necessary. * * @param int $scale The scale of the resulting `BigDecimal`. * @param int $roundingMode A `RoundingMode` constant. * * @throws RoundingNecessaryException If this number cannot be converted to the given scale without rounding. * This only applies when RoundingMode::UNNECESSARY is used. / abstract public function toScale(int $scale, int $roundingMode = RoundingMode::UNNECESSARY) : BigDecimal; /* * Returns the exact value of this number as a native integer. * * If this number cannot be converted to a native integer without losing precision, an exception is thrown. * Note that the acceptable range for an integer depends on the platform and differs for 32-bit and 64-bit. * * @throws MathException If this number cannot be exactly converted to a native integer. / abstract public function toInt() : int; /* * Returns an approximation of this number as a floating-point value. * * Note that this method can discard information as the precision of a floating-point value * is inherently limited. * * If the number is greater than the largest representable floating point number, positive infinity is returned. * If the number is less than the smallest representable floating point number, negative infinity is returned. / abstract public function toFloat() : float; /* * Returns a string representation of this number. * * The output of this method can be parsed by the `of()` factory method; * this will yield an object equal to this one, without any information loss. */ abstract public function __toString() : string; public function jsonSerialize() : string { return $this->__toString(); } } Back

Edit File : BigNumber.php | Size : 15.24 KB

<?php

declare(strict_types=1);

namespace Brick\Math;

use Brick\Math\Exception\DivisionByZeroException;
use Brick\Math\Exception\MathException;
use Brick\Math\Exception\NumberFormatException;
use Brick\Math\Exception\RoundingNecessaryException;

/**
 * Common interface for arbitrary-precision rational numbers.
 *
 * @psalm-immutable
 */
abstract class BigNumber implements \Serializable, \JsonSerializable
{
    /**
     * The regular expression used to parse integer, decimal and rational numbers.
     */
    private const PARSE_REGEXP =
        '/^' .
            '(?<sign>[\-\+])?' .
            '(?:' .
                '(?:' .
                    '(?<integral>[0-9]+)?' .
                    '(?<point>\.)?' .
                    '(?<fractional>[0-9]+)?' .
                    '(?:[eE](?<exponent>[\-\+]?[0-9]+))?' .
                ')|(?:' .
                    '(?<numerator>[0-9]+)' .
                    '\/?' .
                    '(?<denominator>[0-9]+)' .
                ')' .
            ')' .
        '$/';

/**
     * Creates a BigNumber of the given value.
     *
     * The concrete return type is dependent on the given value, with the following rules:
     *
     * - BigNumber instances are returned as is
     * - integer numbers are returned as BigInteger
     * - floating point numbers are converted to a string then parsed as such
     * - strings containing a `/` character are returned as BigRational
     * - strings containing a `.` character or using an exponential notation are returned as BigDecimal
     * - strings containing only digits with an optional leading `+` or `-` sign are returned as BigInteger
     *
     * @throws NumberFormatException   If the format of the number is not valid.
     * @throws DivisionByZeroException If the value represents a rational number with a denominator of zero.
     *
     * @psalm-pure
     */
    public static function of(BigNumber|int|float|string $value) : BigNumber
    {
        if ($value instanceof BigNumber) {
            return $value;
        }

if (\is_int($value)) {
            return new BigInteger((string) $value);
        }

$value = \is_float($value) ? self::floatToString($value) : $value;

$throw = static function() use ($value) : void {
            throw new NumberFormatException(\sprintf(
                'The given value "%s" does not represent a valid number.',
                $value
            ));
        };

if (\preg_match(self::PARSE_REGEXP, $value, $matches) !== 1) {
            $throw();
        }

$getMatch = static fn(string $value): ?string => (($matches[$value] ?? '') !== '') ? $matches[$value] : null;

$sign        = $getMatch('sign');
        $numerator   = $getMatch('numerator');
        $denominator = $getMatch('denominator');

if ($numerator !== null) {
            assert($denominator !== null);

if ($sign !== null) {
                $numerator = $sign . $numerator;
            }

$numerator   = self::cleanUp($numerator);
            $denominator = self::cleanUp($denominator);

if ($denominator === '0') {
                throw DivisionByZeroException::denominatorMustNotBeZero();
            }

return new BigRational(
                new BigInteger($numerator),
                new BigInteger($denominator),
                false
            );
        }

$point      = $getMatch('point');
        $integral   = $getMatch('integral');
        $fractional = $getMatch('fractional');
        $exponent   = $getMatch('exponent');

if ($integral === null && $fractional === null) {
            $throw();
        }

if ($integral === null) {
            $integral = '0';
        }

if ($point !== null || $exponent !== null) {
            $fractional = ($fractional ?? '');
            $exponent = ($exponent !== null) ? (int) $exponent : 0;

if ($exponent === PHP_INT_MIN || $exponent === PHP_INT_MAX) {
                throw new NumberFormatException('Exponent too large.');
            }

$unscaledValue = self::cleanUp(($sign ?? ''). $integral . $fractional);

$scale = \strlen($fractional) - $exponent;

if ($scale < 0) {
                if ($unscaledValue !== '0') {
                    $unscaledValue .= \str_repeat('0', - $scale);
                }
                $scale = 0;
            }

return new BigDecimal($unscaledValue, $scale);
        }

$integral = self::cleanUp(($sign ?? '') . $integral);

return new BigInteger($integral);
    }

/**
     * Safely converts float to string, avoiding locale-dependent issues.
     *
     * @see https://github.com/brick/math/pull/20
     *
     * @psalm-pure
     * @psalm-suppress ImpureFunctionCall
     */
    private static function floatToString(float $float) : string
    {
        $currentLocale = \setlocale(LC_NUMERIC, '0');
        \setlocale(LC_NUMERIC, 'C');

$result = (string) $float;

\setlocale(LC_NUMERIC, $currentLocale);

return $result;
    }

/**
     * Proxy method to access BigInteger's protected constructor from sibling classes.
     *
     * @internal
     * @psalm-pure
     */
    protected function newBigInteger(string $value) : BigInteger
    {
        return new BigInteger($value);
    }

/**
     * Proxy method to access BigDecimal's protected constructor from sibling classes.
     *
     * @internal
     * @psalm-pure
     */
    protected function newBigDecimal(string $value, int $scale = 0) : BigDecimal
    {
        return new BigDecimal($value, $scale);
    }

/**
     * Proxy method to access BigRational's protected constructor from sibling classes.
     *
     * @internal
     * @psalm-pure
     */
    protected function newBigRational(BigInteger $numerator, BigInteger $denominator, bool $checkDenominator) : BigRational
    {
        return new BigRational($numerator, $denominator, $checkDenominator);
    }

/**
     * Returns the minimum of the given values.
     *
     * @param BigNumber|int|float|string ...$values The numbers to compare. All the numbers need to be convertible
     *                                              to an instance of the class this method is called on.
     *
     * @throws \InvalidArgumentException If no values are given.
     * @throws MathException             If an argument is not valid.
     *
     * @psalm-suppress LessSpecificReturnStatement
     * @psalm-suppress MoreSpecificReturnType
     * @psalm-pure
     */
    public static function min(BigNumber|int|float|string ...$values) : static
    {
        $min = null;

foreach ($values as $value) {
            $value = static::of($value);

if ($min === null || $value->isLessThan($min)) {
                $min = $value;
            }
        }

if ($min === null) {
            throw new \InvalidArgumentException(__METHOD__ . '() expects at least one value.');
        }

return $min;
    }

/**
     * Returns the maximum of the given values.
     *
     * @param BigNumber|int|float|string ...$values The numbers to compare. All the numbers need to be convertible
     *                                              to an instance of the class this method is called on.
     *
     * @throws \InvalidArgumentException If no values are given.
     * @throws MathException             If an argument is not valid.
     *
     * @psalm-suppress LessSpecificReturnStatement
     * @psalm-suppress MoreSpecificReturnType
     * @psalm-pure
     */
    public static function max(BigNumber|int|float|string ...$values) : static
    {
        $max = null;

foreach ($values as $value) {
            $value = static::of($value);

if ($max === null || $value->isGreaterThan($max)) {
                $max = $value;
            }
        }

if ($max === null) {
            throw new \InvalidArgumentException(__METHOD__ . '() expects at least one value.');
        }

return $max;
    }

/**
     * Returns the sum of the given values.
     *
     * @param BigNumber|int|float|string ...$values The numbers to add. All the numbers need to be convertible
     *                                              to an instance of the class this method is called on.
     *
     * @throws \InvalidArgumentException If no values are given.
     * @throws MathException             If an argument is not valid.
     *
     * @psalm-pure
     */
    public static function sum(BigNumber|int|float|string ...$values) : static
    {
        /** @var static|null $sum */
        $sum = null;

foreach ($values as $value) {
            $value = static::of($value);

$sum = $sum === null ? $value : self::add($sum, $value);
        }

if ($sum === null) {
            throw new \InvalidArgumentException(__METHOD__ . '() expects at least one value.');
        }

return $sum;
    }

/**
     * Adds two BigNumber instances in the correct order to avoid a RoundingNecessaryException.
     *
     * @todo This could be better resolved by creating an abstract protected method in BigNumber, and leaving to
     *       concrete classes the responsibility to perform the addition themselves or delegate it to the given number,
     *       depending on their ability to perform the operation. This will also require a version bump because we're
     *       potentially breaking custom BigNumber implementations (if any...)
     *
     * @psalm-pure
     */
    private static function add(BigNumber $a, BigNumber $b) : BigNumber
    {
        if ($a instanceof BigRational) {
            return $a->plus($b);
        }

if ($b instanceof BigRational) {
            return $b->plus($a);
        }

if ($a instanceof BigDecimal) {
            return $a->plus($b);
        }

if ($b instanceof BigDecimal) {
            return $b->plus($a);
        }

/** @var BigInteger $a */

return $a->plus($b);
    }

/**
     * Removes optional leading zeros and + sign from the given number.
     *
     * @param string $number The number, validated as a non-empty string of digits with optional leading sign.
     *
     * @psalm-pure
     */
    private static function cleanUp(string $number) : string
    {
        $firstChar = $number[0];

if ($firstChar === '+' || $firstChar === '-') {
            $number = \substr($number, 1);
        }

$number = \ltrim($number, '0');

if ($number === '') {
            return '0';
        }

if ($firstChar === '-') {
            return '-' . $number;
        }

return $number;
    }

/**
     * Checks if this number is equal to the given one.
     */
    public function isEqualTo(BigNumber|int|float|string $that) : bool
    {
        return $this->compareTo($that) === 0;
    }

/**
     * Checks if this number is strictly lower than the given one.
     */
    public function isLessThan(BigNumber|int|float|string $that) : bool
    {
        return $this->compareTo($that) < 0;
    }

/**
     * Checks if this number is lower than or equal to the given one.
     */
    public function isLessThanOrEqualTo(BigNumber|int|float|string $that) : bool
    {
        return $this->compareTo($that) <= 0;
    }

/**
     * Checks if this number is strictly greater than the given one.
     */
    public function isGreaterThan(BigNumber|int|float|string $that) : bool
    {
        return $this->compareTo($that) > 0;
    }

/**
     * Checks if this number is greater than or equal to the given one.
     */
    public function isGreaterThanOrEqualTo(BigNumber|int|float|string $that) : bool
    {
        return $this->compareTo($that) >= 0;
    }

/**
     * Checks if this number equals zero.
     */
    public function isZero() : bool
    {
        return $this->getSign() === 0;
    }

/**
     * Checks if this number is strictly negative.
     */
    public function isNegative() : bool
    {
        return $this->getSign() < 0;
    }

/**
     * Checks if this number is negative or zero.
     */
    public function isNegativeOrZero() : bool
    {
        return $this->getSign() <= 0;
    }

/**
     * Checks if this number is strictly positive.
     */
    public function isPositive() : bool
    {
        return $this->getSign() > 0;
    }

/**
     * Checks if this number is positive or zero.
     */
    public function isPositiveOrZero() : bool
    {
        return $this->getSign() >= 0;
    }

/**
     * Returns the sign of this number.
     *
     * @return int -1 if the number is negative, 0 if zero, 1 if positive.
     */
    abstract public function getSign() : int;

/**
     * Compares this number to the given one.
     *
     * @return int [-1,0,1] If `$this` is lower than, equal to, or greater than `$that`.
     *
     * @throws MathException If the number is not valid.
     */
    abstract public function compareTo(BigNumber|int|float|string $that) : int;

/**
     * Converts this number to a BigInteger.
     *
     * @throws RoundingNecessaryException If this number cannot be converted to a BigInteger without rounding.
     */
    abstract public function toBigInteger() : BigInteger;

/**
     * Converts this number to a BigDecimal.
     *
     * @throws RoundingNecessaryException If this number cannot be converted to a BigDecimal without rounding.
     */
    abstract public function toBigDecimal() : BigDecimal;

/**
     * Converts this number to a BigRational.
     */
    abstract public function toBigRational() : BigRational;

/**
     * Converts this number to a BigDecimal with the given scale, using rounding if necessary.
     *
     * @param int $scale        The scale of the resulting `BigDecimal`.
     * @param int $roundingMode A `RoundingMode` constant.
     *
     * @throws RoundingNecessaryException If this number cannot be converted to the given scale without rounding.
     *                                    This only applies when RoundingMode::UNNECESSARY is used.
     */
    abstract public function toScale(int $scale, int $roundingMode = RoundingMode::UNNECESSARY) : BigDecimal;

/**
     * Returns the exact value of this number as a native integer.
     *
     * If this number cannot be converted to a native integer without losing precision, an exception is thrown.
     * Note that the acceptable range for an integer depends on the platform and differs for 32-bit and 64-bit.
     *
     * @throws MathException If this number cannot be exactly converted to a native integer.
     */
    abstract public function toInt() : int;

/**
     * Returns an approximation of this number as a floating-point value.
     *
     * Note that this method can discard information as the precision of a floating-point value
     * is inherently limited.
     *
     * If the number is greater than the largest representable floating point number, positive infinity is returned.
     * If the number is less than the smallest representable floating point number, negative infinity is returned.
     */
    abstract public function toFloat() : float;

/**
     * Returns a string representation of this number.
     *
     * The output of this method can be parsed by the `of()` factory method;
     * this will yield an object equal to this one, without any information loss.
     */
    abstract public function __toString() : string;

public function jsonSerialize() : string
    {
        return $this->__toString();
    }
}

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