Full Code of a14n/dart-decimal for AI

Repository: a14n/dart-decimal
Branch: master
Commit: 3b1e2c813d92
Files: 15
Total size: 64.7 KB

Directory structure:
gitextract_94seb90j/

├── .github/
│   ├── dependabot.yml
│   └── workflows/
│       └── dart.yml
├── .gitignore
├── CHANGELOG.md
├── LICENSE
├── NOTICE
├── README.md
├── analysis_options.yaml
├── example/
│   ├── lib/
│   │   └── example.dart
│   └── pubspec.yaml
├── lib/
│   ├── decimal.dart
│   └── intl.dart
├── pubspec.yaml
└── test/
    ├── decimal_test.dart
    └── intl_test.dart

================================================
FILE CONTENTS
================================================

================================================
FILE: .github/dependabot.yml
================================================
# Set update schedule for GitHub Actions
# See https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically/keeping-your-actions-up-to-date-with-dependabot

version: 2
updates:

- package-ecosystem: "github-actions"
  directory: "/"
  schedule:
    # Check for updates to GitHub Actions every weekday
    interval: "weekly"

================================================
FILE: .github/workflows/dart.yml
================================================
# This workflow uses actions that are not certified by GitHub.
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.

name: Dart

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]
  schedule:
    - cron: "0 0 * * 0"

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v6
      - uses: dart-lang/setup-dart@v1

      - name: Install dependencies
        run: dart pub get

      - name: Verify formatting
        run: dart format --output=none --set-exit-if-changed .

      - name: Analyze project source
        run: dart analyze --fatal-warnings --fatal-infos

      - name: Run VM tests
        run: dart test --platform vm
      - name: Run Chrome tests
        run: dart test --platform chrome


================================================
FILE: .gitignore
================================================
packages
.packages
pubspec.lock
.pub/
.dart_tool
build/


================================================
FILE: CHANGELOG.md
================================================
# 3.2.4 (2025-06-22)

- Fix issue with scale of zero causing problem in addition/substraction with zero.

# 3.2.3 (2025-06-19)

- Fix bad scale value by parsing `0.0` (see [Issue with Decimal.tryParse return value formatting](https://github.com/a14n/dart-decimal/issues/115))

# 3.2.2 (2025-06-15)

- loosen `intl` to `>=0.19.0 <0.21.0` to address [Intl version within flutter_localizations makes version 3.2.1 of decimal impossible to use on Flutter v3.29.3](https://github.com/a14n/dart-decimal/issues/113)
- Bump `lints` to 5.0.0
- [Make `Decimal.zero`, `Decimal.one`, and  `Decimal.ten` final](https://github.com/a14n/dart-decimal/pull/114)

# 3.2.1 (2025-01-20)

- [fix: toString() method for values < 0.1](https://github.com/a14n/dart-decimal/pull/111)

# 3.2.0 (2025-01-19)

- Improve performances

# 3.1.0 (2024-11-22)

- Bump `intl` to 0.20.0, `lints` to 5.0.0
- Bump SDK to 3.3.0 (enables wasm)

# 3.0.2 (2024-06-09)

- Fix #107: avoid exception when formatting decimal with `NumberFormat.compact()`.

# 3.0.1 (2024-06-04)

- Throw `FormatException` on `formatter.parse('NaN')`.

# 3.0.0 (2024-06-02)

- Add `DecimalFormatter` to deal with [intl](https://pub.dev/packages/intl) package. Your can now parse and format decimals.
- Add a dependency to intl.

# 2.3.3 (2023-07-08)

- [Introduce logical operators to DecimalIntl to support intl 0.18.0](https://github.com/a14n/dart-decimal/pull/98)

# 2.3.2 (2022-12-07)

- Update files according to license.

# 2.3.1 (2022-11-24)

- Update license file to be recognized by pub.dev.

# 2.3.0 (2022-09-07)

- (Breaking change) Fix `Decimal.pow` return type. This method now returns a `Rational` because `3.pow(-1)` (similar to `1/3`) could not be represented as a `Decimal`.
- Allow `Rational.toDecimal()` customization via its new `toBigInt` parameter.

# 2.2.0 (2022-04-19)

- Fix [toStringAsExponential returned 10.00e+7 instead of 1.00e+8](https://github.com/a14n/dart-decimal/issues/74)

# 2.1.0 (2021-12-22)

- Fix [toStringAsExponential returns INFINITY](https://github.com/a14n/dart-decimal/issues/48) by implementing `toStringAsExponential` without relying on double implementation.
- Fix issue to have `zero.precision == 1`.

# 2.0.1 (2021-12-20)

- Fix [`toString` issue with negative number between 0 and -1](https://github.com/a14n/dart-decimal/issues/65)

# 2.0.0 (2021-11-29)

The goal of this version is to have sharper types on the API and to avoid having [Decimal] objects that are not decimal numbers (`1/3` for instance).

It introduces several breaking changes.

- `~/` now returns a `BigInt`. If you need a `Decimal` you can convert the `BigInt` to `Decimal` with `bigint.toDecimal()`.
- Removal of `isNaN` getter. It was always returning `false`.
- Removal of `isInfinite` getter. It was always returning `false`.
- Removal of `isNegative` getter. You can replace it with `decimal < Decimal.zero`.
- `inverse`, `/` now return a `Rational`. If you need a `Decimal` you can convert the `Rational` to `Decimal` with `rational.toDecimal(scaleOnInfinitePrecision: xxx)`. If you need to make several computations where inverses or divisions are involved you should make thoses operations on `Rational` type to avoid loosing precision and at the end convert the result back to `Decimal` if you want to display the result in a decimal form.

Other changes:

- `round()`, `floor()`, `ceil()`, `truncate()` now accept an optional `scale` to indicate at which digit the operation should be done.
- Add `shift` to move the decimal point.
- Add extension method `hasFinitePrecision` on `Rational` to know if a decimal form of the rational is possible without loosing precision.
- Add extension method `toDecimal()` on `Rational`.
- Add extension method `toDecimal()` on `int`.
- Add extension method `toDecimal()` on `BigInt`.

# 1.5.0 (2021-11-17)

- Support json serialization as String with `Decimal.fromJson`/`Decimal.toJson`.

# 1.4.0 (2021-11-16)

- Add `Decimal.ten`.
- Add `Decimal.toBigInt`.

# 1.3.0 (2021-07-21)

- Add `Decimal.fromBigInt`.

# 1.2.0 (2021-05-31)

- Add `DecimalIntl` to allow formatting with [intl](https://pub.dev/packages/intl) package.

# 1.1.0 (2021-04-29)

- Allow negative value as exponent of `pow`.

# 1.0.0+1 (2021-03-29)

- Fix typo in the description of the package.

# 1.0.0 (2021-02-25)

- Stable null safety release.

# 1.0.0-nullsafety (2020-11-27)

- Migrate to nullsafety.

# 0.3.5 (2019-09-02)

- [add `Decimal.pow`](https://github.com/a14n/dart-decimal/issues/24).

# 0.3.4 (2019-07-29)

- add `Decimal.zero` and `Decimal.one`.
- add `Decimal.inverse`.

# 0.3.3 (2019-01-16)

- add `Decimal.tryParse`.

# 0.3.2 (2018-07-24)

- migration to Dart 2.

# v0.3.1 (2018-07-10)

- make `Decimal.parse` a factory constructor.

# v0.3.0 (2018-07-10)

- allow parsing of `1.`

# v0.2.0 (2018-04-15)

- move to Dart SDK 2.0

# v0.1.4 (2017-06-16)

- make package strong clean

# v0.1.3 (2014-10-29)

- add `Decimal.signum`
- add `Decimal.hasFinitePrecision`
- add `Decimal.precision`
- add `Decimal.scale`

# Semantic Version Conventions

http://semver.org/

- *Stable*:  All even numbered minor versions are considered API stable:
  i.e.: v1.0.x, v1.2.x, and so on.
- *Development*: All odd numbered minor versions are considered API unstable:
  i.e.: v0.9.x, v1.1.x, and so on.


================================================
FILE: LICENSE
================================================

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================================================
FILE: NOTICE
================================================
Copyright 2013 Alexandre Ardhuin

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
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limitations under the License.

================================================
FILE: README.md
================================================
# Dart Decimals

[![Build Status](https://github.com/a14n/dart-decimal/actions/workflows/dart.yml/badge.svg)](https://github.com/a14n/dart-decimal/actions/workflows/dart.yml)

This project enable to make computations on decimal numbers without losing precision like double operations.

For instance :

```dart
// with double
print(0.2 + 0.1); // displays 0.30000000000000004

// with decimal
print(Decimal.parse('0.2') + Decimal.parse('0.1')); // displays 0.3
```

## Usage
To use this library in your code :
* add a dependency in your `pubspec.yaml` :

```yaml
dependencies:
  decimal:
```

* add import in your `dart` code :

```dart
import 'package:decimal/decimal.dart';
```

* Start computing using `Decimal.parse('1.23')`.

_Hint_ : To make your code shorter you can define a shortcut for Decimal.parse :

```dart
final d = (String s) => Decimal.parse(s);
d('0.2') + d('0.1'); // => 0.3
```

## Formatting with intl

You can use the [intl](https://pub.dev/packages/intl) package to format decimal
with `DecimalFormat` from the `package:decimal/intl.dart` library:

```dart
import 'package:decimal/decimal.dart';
import 'package:decimal/intl.dart';

main() {
  var value = Decimal.parse('1234.56');
  var formatter = DecimalFormatter(NumberFormat.decimalPattern('en-US'));
  print(formatter.format(value));
}
```

Tip: you can define an extension to make it more fluent:

```dart
extension on Decimal {
  String formatWith(NumberFormat formatter) => formatter.format(DecimalIntl(this));
}
main() {
  var value = Decimal.parse('1234.56');
  var formatter = DecimalFormatter(NumberFormat.decimalPattern('en-US'));
  print(value.formatWith(formatter));
}
```

WARNING: For now (2024.05.30) intl doesn't work with `NumberFormat.maximumFractionDigits` greater than 15 on web plateform and 18 otherwise.

## Parsing with intl

You can use the `NumberFormat` from [intl](https://pub.dev/packages/intl) package to parse formatted decimals

```dart
var currencyFormatter = DecimalFormatter(NumberFormat.simpleCurrency(name: 'USD'));
currencyFormatter.parse('\$3.14'); // => 3.14
```

## License
Apache 2.0


================================================
FILE: analysis_options.yaml
================================================
include: package:lints/recommended.yaml
analyzer:
  language:
    strict-casts: true
    strict-inference: true
    strict-raw-types: true
linter:
  rules:
    - prefer_single_quotes


================================================
FILE: example/lib/example.dart
================================================
import 'package:decimal/decimal.dart';

void main() {
  print(Decimal.parse('0.1') + Decimal.parse('0.2'));
}


================================================
FILE: example/pubspec.yaml
================================================
name: decimal_example
version: 0.0.1
description: Example app for the decimal package.
homepage: https://github.com/a14n/dart-decimal
environment:
  sdk: ">=2.12.0 <3.0.0"
publish_to: none

dependencies:
  decimal:
    path: ../


================================================
FILE: lib/decimal.dart
================================================
// Copyright 2013 Alexandre Ardhuin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:math';

import 'package:rational/rational.dart';

final _i0 = BigInt.zero;
final _i1 = BigInt.one;
final _i2 = BigInt.two;
final _i5 = BigInt.from(5);
final _i10 = BigInt.from(10);
final _r10 = Rational.fromInt(10);

/// A number that can be exactly written with a finite number of digits in the
/// decimal system.
class Decimal implements Comparable<Decimal> {
  Decimal._(this._value, this._scale);

  /// Create a new [Decimal] from a [BigInt].
  factory Decimal.fromBigInt(BigInt value) => Decimal._(value, 0);

  /// Create a new [Decimal] from an [int].
  factory Decimal.fromInt(int value) => Decimal.fromBigInt(BigInt.from(value));

  /// Create a new [Decimal] from its [String] representation.
  factory Decimal.fromJson(String value) => Decimal.parse(value);

  final BigInt _value;
  final int _scale;
  late final Rational _rational = _scale > 0
      ? Rational(_value, _i10.pow(_scale))
      : Rational(_value * _i10.pow(_scale.abs()));

  static final _pattern =
      RegExp(r'^([+-]?\d*)(?:\.(\d*))?(?:[eE]([+-]?\d+))?$');

  /// Parses [source] as a decimal literal and returns its value as [Decimal].
  static Decimal parse(String source) {
    final match = _pattern.firstMatch(source);
    if (match == null) {
      throw FormatException('$source is not a valid format');
    }
    final group1 = match.group(1);
    final group2 = match.group(2) ?? '';
    final group3 = match.group(3);

    var value = BigInt.parse('$group1$group2');
    var scale = group3 == null ? 0 : -int.parse(group3);
    scale += group2.length;
    return Decimal._(value, scale);
  }

  /// Parses [source] as a decimal literal and returns its value as [Decimal], or null if the parsing fails.
  static Decimal? tryParse(String source) {
    try {
      return Decimal.parse(source);
    } on FormatException {
      return null;
    }
  }

  /// The [Decimal] corresponding to `0`.
  static final zero = Decimal.fromInt(0);

  /// The [Decimal] corresponding to `1`.
  static final one = Decimal.fromInt(1);

  /// The [Decimal] corresponding to `10`.
  static final ten = Decimal.fromInt(10);

  /// The [Rational] corresponding to `this`.
  Rational toRational() => _rational;

  /// Returns `true` if `this` is an integer.
  bool get isInteger => _scale <= 0 || _rescaled._scale <= 0;

  /// Returns a [Rational] corresponding to `1/this`.
  Rational get inverse => _rational.inverse;

  @override
  bool operator ==(Object other) => other is Decimal && compareTo(other) == 0;

  @override
  int get hashCode => Object.hash(_rescaled._value, _rescaled._scale);

  /// Returns a [String] representation of `this`.
  @override
  String toString() {
    var d = _rescaled;
    var v = d._value.abs().toString();
    var s = d._scale;
    if (s <= 0) {
      v = v + '0' * -s;
    } else if (v.length <= s) {
      v = '0.${'0' * (s - v.length)}$v';
    } else {
      v = '${v.substring(0, v.length - s)}.${v.substring(v.length - s)}';
    }
    if (_value.isNegative) v = '-$v';
    return v;
  }

  /// Converts `this` to [String] by using [toString].
  String toJson() => toString();

  @override
  int compareTo(Decimal other) {
    var (d1, d2) = _unifyScale(this, other);
    return d1._value.compareTo(d2._value);
  }

  /// Addition operator.
  Decimal operator +(Decimal other) {
    var (d1, d2) = _unifyScale(this, other);
    return Decimal._(d1._value + d2._value, d1._scale);
  }

  /// Subtraction operator.
  Decimal operator -(Decimal other) => this + (-other);

  /// Multiplication operator.
  Decimal operator *(Decimal other) =>
      Decimal._(_value * other._value, _scale + other._scale);

  /// Euclidean modulo operator.
  ///
  /// See [num.operator%].
  Decimal operator %(Decimal other) {
    var (d1, d2) = _unifyScale(this, other);
    return Decimal._(d1._value % d2._value, d1._scale);
  }

  /// Division operator.
  Rational operator /(Decimal other) => _rational / other._rational;

  /// Truncating division operator.
  ///
  /// See [num.operator~/].
  BigInt operator ~/(Decimal other) {
    var (d1, d2) = _unifyScale(this, other);
    return d1._value ~/ d2._value;
  }

  /// Returns the negative value of this rational.
  Decimal operator -() => Decimal._(-_value, _scale);

  /// Return the remainder from dividing this [Decimal] by [other].
  Decimal remainder(Decimal other) {
    var (d1, d2) = _unifyScale(this, other);
    return Decimal._(d1._value.remainder(d2._value), d1._scale);
  }

  /// Whether this number is numerically smaller than [other].
  bool operator <(Decimal other) => compareTo(other) < 0;

  /// Whether this number is numerically smaller than or equal to [other].
  bool operator <=(Decimal other) => compareTo(other) <= 0;

  /// Whether this number is numerically greater than [other].
  bool operator >(Decimal other) => compareTo(other) > 0;

  /// Whether this number is numerically greater than or equal to [other].
  bool operator >=(Decimal other) => compareTo(other) >= 0;

  /// Returns the absolute value of `this`.
  Decimal abs() => Decimal._(_value.abs(), _scale);

  /// The signum function value of `this`.
  ///
  /// E.e. -1, 0 or 1 as the value of this [Decimal] is negative, zero or positive.
  int get sign => _value.sign;

  @Deprecated('Use .sign')
  int get signum => _value.sign;

  /// Returns the greatest [Decimal] value no greater than this [Decimal].
  ///
  /// An optional [scale] value can be provided as parameter to indicate the
  /// digit used as reference for the operation.
  ///
  /// ```
  /// var x = Decimal.parse('123.4567');
  /// x.floor(); // 123
  /// x.floor(scale: 1); // 123.4
  /// x.floor(scale: 2); // 123.45
  /// x.floor(scale: -1); // 120
  /// ```
  Decimal floor({int scale = 0}) => _scaleAndApply(scale, (e) => e.floor());

  /// Returns the least [Decimal] value that is no smaller than this [Decimal].
  ///
  /// An optional [scale] value can be provided as parameter to indicate the
  /// digit used as reference for the operation.
  ///
  /// ```
  /// var x = Decimal.parse('123.4567');
  /// x.ceil(); // 124
  /// x.ceil(scale: 1); // 123.5
  /// x.ceil(scale: 2); // 123.46
  /// x.ceil(scale: -1); // 130
  /// ```
  Decimal ceil({int scale = 0}) => _scaleAndApply(scale, (e) => e.ceil());

  /// Returns the [Decimal] value closest to this number.
  ///
  /// Rounds away from zero when there is no closest integer:
  /// `(3.5).round() == 4` and `(-3.5).round() == -4`.
  ///
  /// An optional [scale] value can be provided as parameter to indicate the
  /// digit used as reference for the operation.
  ///
  /// ```
  /// var x = Decimal.parse('123.4567');
  /// x.round(); // 123
  /// x.round(scale: 1); // 123.5
  /// x.round(scale: 2); // 123.46
  /// x.round(scale: -1); // 120
  /// ```
  Decimal round({int scale = 0}) => _scaleAndApply(scale, (e) => e.round());

  Decimal _scaleAndApply(int scale, BigInt Function(Rational) f) {
    final scaleFactor = ten.pow(scale);
    return (f(_rational * scaleFactor).toRational() / scaleFactor).toDecimal();
  }

  /// The [BigInt] obtained by discarding any fractional digits from `this`.
  Decimal truncate({int scale = 0}) =>
      _scaleAndApply(scale, (e) => e.truncate());

  /// Shift the decimal point on the right for positive [value] or on the left
  /// for negative one.
  ///
  /// ```dart
  /// var x = Decimal.parse('123.4567');
  /// x.shift(1); // 1234.567
  /// x.shift(-1); // 12.34567
  /// ```
  Decimal shift(int value) => Decimal._(_value, _scale - value);

  /// Clamps `this` to be in the range [lowerLimit]-[upperLimit].
  Decimal clamp(Decimal lowerLimit, Decimal upperLimit) => this < lowerLimit
      ? lowerLimit
      : this > upperLimit
          ? upperLimit
          : this;

  /// The [BigInt] obtained by discarding any fractional digits from `this`.
  BigInt toBigInt() => switch (this) {
        var d when d._scale > 0 => d._value ~/ _i10.pow(d._scale),
        var d when d._scale < 0 => d._value * _i10.pow(-d._scale),
        var d => d._value,
      };

  /// Returns `this` as a [double].
  ///
  /// If the number is not representable as a [double], an approximation is
  /// returned. For numerically large integers, the approximation may be
  /// infinite.
  double toDouble() => switch (this) {
        var d when d._scale > 0 => d._value / _i10.pow(d._scale),
        var d when d._scale < 0 => (d._value * _i10.pow(-d._scale)).toDouble(),
        var d => d._value.toDouble(),
      };

  /// The precision of this [Decimal].
  ///
  /// The precision is the number of digits in the unscaled value.
  ///
  /// ```dart
  /// Decimal.parse('0').precision; // => 1
  /// Decimal.parse('1').precision; // => 1
  /// Decimal.parse('1.5').precision; // => 2
  /// Decimal.parse('0.5').precision; // => 2
  /// ```
  int get precision {
    final value = abs();
    return value.scale + value.toBigInt().toString().length;
  }

  /// The scale of this [Decimal].
  ///
  /// The scale is the number of digits after the decimal point.
  ///
  /// ```dart
  /// Decimal.parse('1.5').scale; // => 1
  /// Decimal.parse('1').scale; // => 0
  /// ```
  int get scale => _scale <= 0 ? 0 : max(_rescaled._scale, 0);

  /// A decimal-point string-representation of this number with [fractionDigits]
  /// digits after the decimal point.
  String toStringAsFixed(int fractionDigits) {
    assert(fractionDigits >= 0);
    if (fractionDigits == 0) return round().toBigInt().toString();
    final value = round(scale: fractionDigits);
    final intPart = value.toBigInt().abs();
    final decimalPart =
        (one + value.abs() - intPart.toDecimal()).shift(fractionDigits);
    return '${value < zero ? '-' : ''}$intPart.${decimalPart.toString().substring(1)}';
  }

  /// An exponential string-representation of this number with [fractionDigits]
  /// digits after the decimal point.
  String toStringAsExponential([int fractionDigits = 0]) {
    assert(fractionDigits >= 0);

    final negative = this < zero;
    var value = abs();
    var eValue = 0;
    while (value < one && value > zero) {
      value *= ten;
      eValue--;
    }
    while (value >= ten) {
      value = (value / ten).toDecimal();
      eValue++;
    }
    value = value.round(scale: fractionDigits);
    // If the rounded value is 10, then divide it once more to make it follow
    // the normalized scientific notation. See https://github.com/a14n/dart-decimal/issues/74
    if (value == ten) {
      value = (value / ten).toDecimal();
      eValue++;
    }

    return <String>[
      if (negative) '-',
      value.toStringAsFixed(fractionDigits),
      'e',
      if (eValue >= 0) '+',
      '$eValue',
    ].join();
  }

  /// A string representation with [precision] significant digits.
  String toStringAsPrecision(int precision) {
    assert(precision > 0);

    if (this == zero) {
      return <String>[
        '0',
        if (precision > 1) '.',
        for (var i = 1; i < precision; i++) '0',
      ].join();
    }

    final limit = ten.pow(precision).toDecimal();

    var shift = one;
    final absValue = abs();
    var pad = 0;
    while (absValue * shift < limit) {
      pad++;
      shift *= ten;
    }
    while (absValue * shift >= limit) {
      pad--;
      shift = (shift / ten).toDecimal();
    }
    final value = ((this * shift).round() / shift).toDecimal();
    return pad <= 0 ? value.toString() : value.toStringAsFixed(pad);
  }

  /// Returns `this` to the power of [exponent].
  ///
  /// Returns [Rational.one] if the [exponent] equals `0`.
  Rational pow(int exponent) => _rational.pow(exponent);

  static (Decimal, Decimal) _unifyScale(Decimal d1, Decimal d2) {
    var s1 = d1._scale;
    var s2 = d2._scale;
    return switch (null) {
      _ when s1 > s2 => (d1, Decimal._(d2._value * _i10.pow(s1 - s2), s1)),
      _ when s1 < s2 => (Decimal._(d1._value * _i10.pow(s2 - s1), s2), d2),
      _ => (d1, d2),
    };
  }

  late final Decimal _rescaled = () {
    if (this == Decimal.zero) return Decimal.zero;
    var d = this;
    while (true) {
      if (d._value % _i10 == _i0) {
        d = Decimal._(d._value ~/ _i10, d._scale - 1);
      } else {
        break;
      }
    }
    return d;
  }();
}

/// Extensions on [Rational].
extension RationalExt on Rational {
  /// Returns a [Decimal] corresponding to `this`.
  ///
  /// Some rational like `1/3` can not be converted to decimal because they need
  /// an infinite number of digits. For those cases (where [hasFinitePrecision]
  /// is `false`) a [scaleOnInfinitePrecision] and a [toBigInt] can be provided
  /// to convert `this` to a [Decimal] representation. By default [toBigInt]
  /// use [Rational.truncate] to limit the number of digit.
  ///
  /// Note that the returned decimal will not be exactly equal to `this`.
  Decimal toDecimal({
    int? scaleOnInfinitePrecision,
    BigInt Function(Rational)? toBigInt,
  }) {
    if (hasFinitePrecision) {
      var scale = _scale;
      return Decimal._((this * Rational(_i10.pow(scale))).toBigInt(), scale);
    }
    if (scaleOnInfinitePrecision == null) {
      throw AssertionError(
          'scaleOnInfinitePrecision is required for rationale without finite precision');
    }
    final scaleFactor = _r10.pow(scaleOnInfinitePrecision);
    toBigInt ??= (value) => value.truncate();
    return Decimal._(toBigInt(this * scaleFactor), scaleOnInfinitePrecision);
  }

  /// Returns `true` if this [Rational] has a finite precision.
  ///
  /// Having a finite precision means that the number can be exactly represented
  /// as decimal with a finite number of fractional digits.
  bool get hasFinitePrecision {
    // the denominator should only be a product of powers of 2 and 5
    var den = denominator;
    while (den % _i5 == _i0) {
      den = den ~/ _i5;
    }
    while (den % _i2 == _i0) {
      den = den ~/ _i2;
    }
    return den == _i1;
  }

  /// The scale of this [Rational].
  ///
  /// The scale is the number of digits after the decimal point.
  ///
  /// ```dart
  /// Decimal.parse('1.5').scale; // => 1
  /// Decimal.parse('1').scale; // => 0
  /// ```
  int get _scale {
    var i = 0;
    var x = this;
    while (!x.isInteger) {
      i++;
      x *= _r10;
    }
    return i;
  }
}

/// Extensions on [BigInt].
extension BigIntExt on BigInt {
  /// This [BigInt] as a [Decimal].
  Decimal toDecimal() => Decimal.fromBigInt(this);
}

/// Extensions on [int].
extension IntExt on int {
  /// This [int] as a [Decimal].
  Decimal toDecimal() => Decimal.fromInt(this);
}


================================================
FILE: lib/intl.dart
================================================
// Copyright 2013 Alexandre Ardhuin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'package:decimal/decimal.dart';
import 'package:intl/intl.dart';
import 'package:rational/rational.dart';

class DecimalFormatter {
  DecimalFormatter(this.numberFormat);

  final NumberFormat numberFormat;

  /// Parses [text] as a decimal literal using the provided number formatter and returns its value as [Decimal]
  Decimal parse(String text) =>
      _DartDecimalNumberParser(numberFormat, text).value!;

  /// Parses [text] as a decimal literal using the provided number formatter and returns its value as [Decimal], or null if the parsing fails.
  Decimal? tryParse(String text) {
    try {
      return parse(text);
    } on FormatException {
      return null;
    }
  }

  /// Format [number] according to our pattern and return the formatted string.
  String format(Decimal number) => numberFormat.format(_DecimalIntl(number));
}

class _DecimalIntl {
  _DecimalIntl(Decimal decimal) : this._rational(decimal.toRational());

  _DecimalIntl._rational(this._rational);

  factory _DecimalIntl._(dynamic number) {
    if (number is _DecimalIntl) {
      return number;
    } else if (number is Decimal) {
      return _DecimalIntl(number);
    } else if (number is Rational) {
      return _DecimalIntl._rational(number);
    } else if (number is BigInt) {
      return _DecimalIntl(Decimal.fromBigInt(number));
    } else if (number is int) {
      return _DecimalIntl(Decimal.fromInt(number));
    }
    return _DecimalIntl(Decimal.parse(number.toString()));
  }

  final Rational _rational;

  bool get isNegative => _rational < Rational.zero;

  _DecimalIntl abs() => _DecimalIntl._rational(_rational.abs());

  _DecimalIntl operator ~/(dynamic other) =>
      _DecimalIntl._(_rational ~/ _DecimalIntl._(other)._rational);

  _DecimalIntl operator +(dynamic other) =>
      _DecimalIntl._(_rational + _DecimalIntl._(other)._rational);

  _DecimalIntl operator -(dynamic other) =>
      _DecimalIntl._(_rational - _DecimalIntl._(other)._rational);

  _DecimalIntl operator *(dynamic other) =>
      _DecimalIntl._(_rational * _DecimalIntl._(other)._rational);

  num operator /(dynamic other) =>
      (_rational / _DecimalIntl._(other)._rational).toDouble();

  bool operator <(dynamic other) => _rational < _DecimalIntl._(other)._rational;

  bool operator <=(dynamic other) =>
      _rational <= _DecimalIntl._(other)._rational;

  bool operator >(dynamic other) => _rational > _DecimalIntl._(other)._rational;

  bool operator >=(dynamic other) =>
      _rational >= _DecimalIntl._(other)._rational;

  _DecimalIntl remainder(dynamic other) =>
      _DecimalIntl._(_rational.remainder(_DecimalIntl._(other)._rational));

  int toInt() => _rational.toBigInt().toInt();

  double toDouble() => _rational.toDouble();

  _DecimalIntl round() => _DecimalIntl._(_rational.round());

  @override
  bool operator ==(Object other) =>
      _rational == _DecimalIntl._(other)._rational;

  @override
  int get hashCode => _rational.hashCode;

  @override
  String toString() => _rational.toString();
}

class _DartDecimalNumberParser extends NumberParserBase<Decimal> {
  _DartDecimalNumberParser(super.format, super.text);

  @override
  Decimal fromNormalized(String normalizedText) =>
      Decimal.parse(normalizedText);

  @override
  Decimal nan() => throw FormatException('Could not parse Decimal');

  @override
  Decimal negativeInfinity() =>
      throw FormatException('Could not parse Decimal');

  @override
  Decimal positiveInfinity() =>
      throw FormatException('Could not parse Decimal');

  @override
  Decimal scaled(Decimal parsed, int scale) => (parsed / Decimal.fromInt(scale))
      .toDecimal(scaleOnInfinitePrecision: scale);
}


================================================
FILE: pubspec.yaml
================================================
name: decimal
version: 3.2.4
description: >
  The decimal package allows you to deal with decimal numbers without losing
  precision.
repository: https://github.com/a14n/dart-decimal
environment:
  sdk: ">=3.3.0 <4.0.0"

dependencies:
  intl: ">=0.19.0 <0.21.0"
  rational: ^2.0.0

dev_dependencies:
  expector: ^0.1.4
  lints: 6.0.0
  test: ^1.25.4


================================================
FILE: test/decimal_test.dart
================================================
// Copyright 2013 Alexandre Ardhuin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:convert';

import 'package:decimal/decimal.dart';
import 'package:expector/expector.dart';
import 'package:rational/rational.dart';
import 'package:test/test.dart' show group, test;

Decimal dec(String value) => Decimal.parse(value);

void main() {
  test('tryParse', () {
    expectThat(Decimal.tryParse('1')).equals(dec('1'));
    expectThat(Decimal.tryParse('a')).isNull;
  });
  test('string validation', () async {
    await expectThat(() => dec('1')).returnsNormally();
    await expectThat(() => dec('-1')).returnsNormally();
    await expectThat(() => dec('1.')).returnsNormally();
    await expectThat(() => dec('1.0')).returnsNormally();
  });
  test('get isInteger', () {
    expectThat(dec('1').isInteger).isTrue;
    expectThat(dec('0').isInteger).isTrue;
    expectThat(dec('-1').isInteger).isTrue;
    expectThat(dec('-1.0').isInteger).isTrue;
    expectThat(dec('1.2').isInteger).isFalse;
    expectThat(dec('-1.21').isInteger).isFalse;
    expectThat(dec('1.00000').isInteger).isTrue;
    expectThat(dec('-1.00000').isInteger).isTrue;
  });
  test('get inverse', () {
    expectThat(dec('1').inverse).equals(dec('1').toRational());
    expectThat(dec('0.1').inverse).equals(dec('10').toRational());
    expectThat(dec('200').inverse).equals(dec('0.005').toRational());
  });
  test('operator ==(Decimal other)', () {
    expectThat(dec('1') == dec('1')).isTrue;
    expectThat(dec('1') == dec('2')).isFalse;
    expectThat(dec('1') == dec('1.0')).isTrue;
    expectThat(dec('1') == dec('2.0')).isFalse;
    expectThat(dec('1') != dec('1')).isFalse;
    expectThat(dec('1') != dec('2')).isTrue;
  });
  test('toString()', () {
    for (final n in [
      '0',
      '1',
      '-0.1',
      '-1',
      '-1.1',
      '23',
      '31878018903828899277492024491376690701584023926880.1',
      '0.05'
    ]) {
      expectThat(dec(n).toString()).equals(n);
    }
    expectThat(dec('0.000').toString()).equals('0');
    expectThat(dec('-0.000').toString()).equals('0');
    expectThat((dec('1.2') - dec('1.2')).toString()).equals('0');
    expectThat(dec('1.000').toString()).equals('1');
    expectThat(dec('-1.000').toString()).equals('-1');
    expectThat((dec('1') / dec('3')).toString()).equals('1/3');
    expectThat(dec('9.9').toString()).equals('9.9');
    expectThat((dec('1.0000000000000000000000000000000000000000000000001') *
                dec('1.0000000000000000000000000000000000000000000000001'))
            .toString())
        .equals(
            '1.00000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000001');
    expectThat(dec('0.0500').toString()).equals('0.05');
  });
  test('compareTo(Decimal other)', () {
    expectThat(dec('1').compareTo(dec('1'))).equals(0);
    expectThat(dec('1').compareTo(dec('1.0'))).equals(0);
    expectThat(dec('1').compareTo(dec('1.1'))).equals(-1);
    expectThat(dec('1').compareTo(dec('0.9'))).equals(1);
  });
  test('operator +(Decimal other)', () {
    expectThat(dec('1') + dec('1')).equals(dec('2'));
    expectThat(dec('1.1') + dec('1')).equals(dec('2.1'));
    expectThat(dec('1.1') + dec('0.9')).equals(dec('2'));
    expectThat(dec('31878018903828899277492024491376690701584023926880.0') +
            dec('0.9'))
        .equals(dec('31878018903828899277492024491376690701584023926880.9'));
    expectThat(dec('0.000325') + dec('0')).equals(dec('0.000325'));
    expectThat(dec('0') + dec('0.000325')).equals(dec('0.000325'));
    expectThat(dec('0.000325') + Decimal.zero).equals(dec('0.000325'));
    expectThat(Decimal.zero + dec('0.000325')).equals(dec('0.000325'));
    expectThat(dec('0.000325') + dec('0.0000000000')).equals(dec('0.000325'));
    expectThat(dec('0.0000000000') + dec('0.000325')).equals(dec('0.000325'));
  });
  test('operator -(Decimal other)', () {
    expectThat(dec('1') - dec('1')).equals(dec('0'));
    expectThat(dec('1.1') - dec('1')).equals(dec('0.1'));
    expectThat(dec('0.1') - dec('1.1')).equals(dec('-1'));
    expectThat(dec('31878018903828899277492024491376690701584023926880.0') -
            dec('0.9'))
        .equals(dec('31878018903828899277492024491376690701584023926879.1'));
  });
  test('operator *(Decimal other)', () {
    expectThat(dec('1') * dec('1')).equals(dec('1'));
    expectThat(dec('1.1') * dec('1')).equals(dec('1.1'));
    expectThat(dec('1.1') * dec('0.1')).equals(dec('0.11'));
    expectThat(dec('1.1') * dec('0')).equals(dec('0'));
    expectThat(dec('31878018903828899277492024491376690701584023926880.0') *
            dec('10'))
        .equals(dec('318780189038288992774920244913766907015840239268800'));
  });
  test('operator %(Decimal other)', () {
    expectThat(dec('2') % dec('1')).equals(dec('0'));
    expectThat(dec('0') % dec('1')).equals(dec('0'));
    expectThat(dec('8.9') % dec('1.1')).equals(dec('0.1'));
    expectThat(dec('-1.2') % dec('0.5')).equals(dec('0.3'));
    expectThat(dec('-1.2') % dec('-0.5')).equals(dec('0.3'));
    expectThat(dec('1e1') % dec('0.3')).equals(dec('0.1'));
    expectThat(dec('0.3') % dec('1e1')).equals(dec('0.3'));
  });
  test('operator /(Decimal other)', () async {
    await expectThat(() => dec('1') / dec('0')).throws;
    expectThat(dec('1') / dec('1')).equals(dec('1').toRational());
    expectThat(dec('1.1') / dec('1')).equals(dec('1.1').toRational());
    expectThat(dec('1.1') / dec('0.1')).equals(dec('11').toRational());
    expectThat(dec('0') / dec('0.2315')).equals(dec('0').toRational());
    expectThat(dec('31878018903828899277492024491376690701584023926880.0') /
            dec('10'))
        .equals(dec('3187801890382889927749202449137669070158402392688')
            .toRational());
  });
  test('operator ~/(Decimal other)', () async {
    await expectThat(() => dec('1') ~/ dec('0')).throws;
    expectThat(dec('3') ~/ dec('2')).equals(BigInt.from(1));
    expectThat(dec('1.1') ~/ dec('1')).equals(BigInt.from(1));
    expectThat(dec('1.1') ~/ dec('0.1')).equals(BigInt.from(11));
    expectThat(dec('0') ~/ dec('0.2315')).equals(BigInt.from(0));
  });
  test('operator -()', () {
    expectThat(-dec('1')).equals(dec('-1'));
    expectThat(-dec('-1')).equals(dec('1'));
  });
  test('remainder(Decimal other)', () {
    expectThat(dec('2').remainder(dec('1'))).equals(dec('0'));
    expectThat(dec('0').remainder(dec('1'))).equals(dec('0'));
    expectThat(dec('8.9').remainder(dec('1.1'))).equals(dec('0.1'));
    expectThat(dec('-1.2').remainder(dec('0.5'))).equals(dec('-0.2'));
    expectThat(dec('-1.2').remainder(dec('-0.5'))).equals(dec('-0.2'));
  });
  test('operator <(Decimal other)', () {
    expectThat(dec('1') < dec('1')).isFalse;
    expectThat(dec('1') < dec('1.0')).isFalse;
    expectThat(dec('1') < dec('1.1')).isTrue;
    expectThat(dec('1') < dec('0.9')).isFalse;
  });
  test('operator <=(Decimal other)', () {
    expectThat(dec('1') <= dec('1')).isTrue;
    expectThat(dec('1') <= dec('1.0')).isTrue;
    expectThat(dec('1') <= dec('1.1')).isTrue;
    expectThat(dec('1') <= dec('0.9')).isFalse;
  });
  test('operator >(Decimal other)', () {
    expectThat(dec('1') > dec('1')).isFalse;
    expectThat(dec('1') > dec('1.0')).isFalse;
    expectThat(dec('1') > dec('1.1')).isFalse;
    expectThat(dec('1') > dec('0.9')).isTrue;
  });
  test('operator >=(Decimal other)', () {
    expectThat(dec('1') >= dec('1')).isTrue;
    expectThat(dec('1') >= dec('1.0')).isTrue;
    expectThat(dec('1') >= dec('1.1')).isFalse;
    expectThat(dec('1') >= dec('0.9')).isTrue;
  });
  test('abs()', () {
    expectThat(dec('-1.49').abs()).equals(dec('1.49'));
    expectThat(dec('1.498').abs()).equals(dec('1.498'));
  });
  test('signum', () {
    expectThat(dec('-1.49').sign).equals(-1);
    expectThat(dec('1.49').sign).equals(1);
    expectThat(dec('0').sign).equals(0);
  });
  group('floor()', () {
    test('without scale', () {
      expectThat(dec('1').floor()).equals(dec('1'));
      expectThat(dec('-1').floor()).equals(dec('-1'));
      expectThat(dec('1.49').floor()).equals(dec('1'));
      expectThat(dec('-1.49').floor()).equals(dec('-2'));
    });
    test('with positive scale', () {
      expectThat(dec('1').floor(scale: 1)).equals(dec('1'));
      expectThat(dec('-1').floor(scale: 1)).equals(dec('-1'));
      expectThat(dec('1.49').floor(scale: 1)).equals(dec('1.4'));
      expectThat(dec('-1.49').floor(scale: 1)).equals(dec('-1.5'));
    });
    test('with negative scale', () {
      expectThat(dec('1').floor(scale: -1)).equals(dec('0'));
      expectThat(dec('-1').floor(scale: -1)).equals(dec('-10'));
      expectThat(dec('14.9').floor(scale: -1)).equals(dec('10'));
      expectThat(dec('-14.9').floor(scale: -1)).equals(dec('-20'));
    });
  });
  group('ceil()', () {
    test('without scale', () {
      expectThat(dec('1').ceil()).equals(dec('1'));
      expectThat(dec('-1').ceil()).equals(dec('-1'));
      expectThat(dec('-1.49').ceil()).equals(dec('-1'));
      expectThat(dec('1.49').ceil()).equals(dec('2'));
    });
    test('with positive scale', () {
      expectThat(dec('1').ceil(scale: 1)).equals(dec('1'));
      expectThat(dec('-1').ceil(scale: 1)).equals(dec('-1'));
      expectThat(dec('-1.49').ceil(scale: 1)).equals(dec('-1.4'));
      expectThat(dec('1.49').ceil(scale: 1)).equals(dec('1.5'));
    });
    test('with negative scale', () {
      expectThat(dec('1').ceil(scale: -1)).equals(dec('10'));
      expectThat(dec('-1').ceil(scale: -1)).equals(dec('0'));
      expectThat(dec('-14.9').ceil(scale: -1)).equals(dec('-10'));
      expectThat(dec('14.9').ceil(scale: -1)).equals(dec('20'));
    });
  });
  group('round()', () {
    test('without scale', () {
      expectThat(dec('1.4999').round()).equals(dec('1'));
      expectThat(dec('2.5').round()).equals(dec('3'));
      expectThat(dec('-2.51').round()).equals(dec('-3'));
      expectThat(dec('-2').round()).equals(dec('-2'));
    });
    test('with positive scale', () {
      expectThat(dec('1.4999').round(scale: 1)).equals(dec('1.5'));
      expectThat(dec('2.5').round(scale: 1)).equals(dec('2.5'));
      expectThat(dec('-2.51').round(scale: 1)).equals(dec('-2.5'));
      expectThat(dec('-2').round(scale: 1)).equals(dec('-2'));
    });
    test('with negative scale', () {
      expectThat(dec('1.4999').round(scale: -1)).equals(dec('0'));
      expectThat(dec('12.5').round(scale: -1)).equals(dec('10'));
      expectThat(dec('-25.1').round(scale: -1)).equals(dec('-30'));
      expectThat(dec('-24').round(scale: -1)).equals(dec('-20'));
    });
  });
  group('truncate()', () {
    test('without scale', () {
      expectThat(dec('1.4999').truncate()).equals(dec('1'));
      expectThat(dec('2.5').truncate()).equals(dec('2'));
      expectThat(dec('-2.51').truncate()).equals(dec('-2'));
      expectThat(dec('-2').truncate()).equals(dec('-2'));
    });
    test('with positive scale', () {
      expectThat(dec('1.4999').truncate(scale: 1)).equals(dec('1.4'));
      expectThat(dec('2.5').truncate(scale: 1)).equals(dec('2.5'));
      expectThat(dec('-2.51').truncate(scale: 1)).equals(dec('-2.5'));
      expectThat(dec('-2').truncate(scale: 1)).equals(dec('-2'));
    });
    test('with negative scale', () {
      expectThat(dec('1.4999').truncate(scale: -1)).equals(dec('0'));
      expectThat(dec('12.5').truncate(scale: -1)).equals(dec('10'));
      expectThat(dec('-25.1').truncate(scale: -1)).equals(dec('-20'));
      expectThat(dec('-24').truncate(scale: -1)).equals(dec('-20'));
    });
  });
  test('shift()', () {
    expectThat(dec('123.4567').shift(0)).equals(dec('123.4567'));
    expectThat(dec('123.4567').shift(1)).equals(dec('1234.567'));
    expectThat(dec('123.4567').shift(2)).equals(dec('12345.67'));
    expectThat(dec('123.4567').shift(6)).equals(dec('123456700'));
    expectThat(dec('123.4567').shift(-1)).equals(dec('12.34567'));
    expectThat(dec('123.4567').shift(-2)).equals(dec('1.234567'));
    expectThat(dec('123.4567').shift(-3)).equals(dec('0.1234567'));
  });
  test('clamp(Decimal lowerLimit, Decimal upperLimit)', () {
    expectThat(dec('2.51').clamp(dec('1'), dec('3'))).equals(dec('2.51'));
    expectThat(dec('2.51').clamp(dec('2.6'), dec('3'))).equals(dec('2.6'));
    expectThat(dec('2.51').clamp(dec('1'), dec('2.5'))).equals(dec('2.5'));
  });
  test('toBigInt()', () {
    expectThat(dec('2.51').toBigInt()).equals(BigInt.from(2));
    expectThat(dec('-2.51').toBigInt()).equals(BigInt.from(-2));
    expectThat(dec('-2').toBigInt()).equals(BigInt.from(-2));
  });
  test('toDouble()', () {
    expectThat(dec('2.51').toDouble()).equals(2.51);
    expectThat(dec('-2.51').toDouble()).equals(-2.51);
    expectThat(dec('-2').toDouble()).equals(-2.0);
  });
  test('precision', () {
    expectThat(dec('100').precision).equals(3);
    expectThat(dec('10000').precision).equals(5);
    expectThat(dec('-10000').precision).equals(5);
    expectThat(dec('1e5').precision).equals(6);
    expectThat(dec('100.000').precision).equals(3);
    expectThat(dec('100.1').precision).equals(4);
    expectThat(dec('100.0000001').precision).equals(10);
    expectThat(dec('-100.0000001').precision).equals(10);
    expectThat(dec('100.000000000000000000000000000001').precision).equals(33);
    expectThat(dec('0').precision).equals(1);
    expectThat(dec('0.10').precision).equals(2);
    expectThat(dec('0.00').precision).equals(1);
    expectThat(dec('0.1').precision).equals(2);
    expectThat(dec('0.01').precision).equals(3);
    expectThat(dec('-0.01').precision).equals(3);
  });
  test('scale', () {
    expectThat(dec('100').scale).equals(0);
    expectThat(dec('10000').scale).equals(0);
    expectThat(dec('100.000').scale).equals(0);
    expectThat(dec('100.1').scale).equals(1);
    expectThat(dec('100.0000001').scale).equals(7);
    expectThat(dec('-100.0000001').scale).equals(7);
    expectThat(dec('100.000000000000000000000000000001').scale).equals(30);
  });
  test('toStringAsFixed(int fractionDigits)', () {
    for (final n in [0, 1, 23, 2.2, 2.499999, 2.5, 2.7, 1.235]) {
      for (final p in [0, 1, 5, 10]) {
        expectThat(dec(n.toString()).toStringAsFixed(p))
            .equals(n.toStringAsFixed(p));
      }
    }
    expectThat(dec('19').toStringAsFixed(5)).equals('19.00000');
  });
  test('toStringAsExponential(int fractionDigits)', () {
    expectThat(dec('0').toStringAsExponential(0)).equals('0e+0');
    for (final n in [0, 1, 23, 2.2, 2.499999, 2.5, 2.7, 1.235, -1.2, -0.02]) {
      for (final p in [1, 5, 10]) {
        expectThat(dec(n.toString()).toStringAsExponential(p))
            .equals(n.toStringAsExponential(p));
      }
    }
    // issue https://github.com/a14n/dart-decimal/issues/48
    expectThat(dec('1.7976931348623157e+310').toStringAsExponential(10))
        .equals('1.7976931349e+310');
    // issue https://github.com/a14n/dart-decimal/issues/74
    expectThat(dec('9.9999e+7').toStringAsExponential(2)).equals('1.00e+8');
  });
  test('toStringAsPrecision(int precision)', () {
    expectThat(dec('0').toStringAsPrecision(1)).equals('0');
    expectThat(dec('0').toStringAsPrecision(5)).equals('0.0000');
    expectThat(dec('0').toStringAsPrecision(10)).equals('0.000000000');
    expectThat(dec('1').toStringAsPrecision(1)).equals('1');
    expectThat(dec('1').toStringAsPrecision(5)).equals('1.0000');
    expectThat(dec('1').toStringAsPrecision(10)).equals('1.000000000');
    expectThat(dec('23').toStringAsPrecision(1)).equals('20');
    expectThat(dec('23').toStringAsPrecision(5)).equals('23.000');
    expectThat(dec('23').toStringAsPrecision(10)).equals('23.00000000');
    expectThat(dec('2.2').toStringAsPrecision(1)).equals('2');
    expectThat(dec('2.2').toStringAsPrecision(5)).equals('2.2000');
    expectThat(dec('2.2').toStringAsPrecision(10)).equals('2.200000000');
    expectThat(dec('2.499999').toStringAsPrecision(1)).equals('2');
    expectThat(dec('2.499999').toStringAsPrecision(5)).equals('2.5000');
    expectThat(dec('2.499999').toStringAsPrecision(10)).equals('2.499999000');
    expectThat(dec('2.5').toStringAsPrecision(1)).equals('3');
    expectThat(dec('2.5').toStringAsPrecision(5)).equals('2.5000');
    expectThat(dec('2.5').toStringAsPrecision(10)).equals('2.500000000');
    expectThat(dec('2.7').toStringAsPrecision(1)).equals('3');
    expectThat(dec('2.7').toStringAsPrecision(5)).equals('2.7000');
    expectThat(dec('2.7').toStringAsPrecision(10)).equals('2.700000000');
    expectThat(dec('1.235').toStringAsPrecision(1)).equals('1');
    expectThat(dec('1.235').toStringAsPrecision(5)).equals('1.2350');
    expectThat(dec('1.235').toStringAsPrecision(10)).equals('1.235000000');
  });
  test('issue #13', () {
    expectThat(Decimal.parse('21.962962546543768').toString())
        .equals('21.962962546543768');
  });
  test('zero', () {
    expectThat(Decimal.zero).equals(Decimal.fromInt(0));
  });
  test('one', () {
    expectThat(Decimal.one).equals(Decimal.fromInt(1));
  });
  test('ten', () {
    expectThat(Decimal.ten).equals(Decimal.fromInt(10));
  });
  test('pow', () {
    expectThat(dec('100').pow(0)).equals(dec('1').toRational());
    expectThat(dec('100').pow(1)).equals(dec('100').toRational());
    expectThat(dec('100').pow(2)).equals(dec('10000').toRational());
    expectThat(dec('100').pow(-1)).equals(dec('0.01').toRational());
    expectThat(dec('100').pow(-2)).equals(dec('0.0001').toRational());
    expectThat(dec('0.1').pow(0)).equals(dec('1').toRational());
    expectThat(dec('0.1').pow(1)).equals(dec('0.1').toRational());
    expectThat(dec('0.1').pow(2)).equals(dec('0.01').toRational());
    expectThat(dec('0.1').pow(-1)).equals(dec('10').toRational());
    expectThat(dec('0.1').pow(-2)).equals(dec('100').toRational());
    expectThat(dec('-1').pow(0)).equals(dec('1').toRational());
    expectThat(dec('-1').pow(1)).equals(dec('-1').toRational());
    expectThat(dec('-1').pow(2)).equals(dec('1').toRational());
    expectThat(dec('-1').pow(-1)).equals(dec('-1').toRational());
    expectThat(dec('-1').pow(-2)).equals(dec('1').toRational());
  });
  test('fromJson', () async {
    expectThat(Decimal.fromJson('1')).equals(Decimal.one);
    await expectThat(() => Decimal.fromJson('-1')).returnsNormally();
    await expectThat(() => Decimal.fromJson('1.')).returnsNormally();
    await expectThat(() => Decimal.fromJson('1.0')).returnsNormally();
  });
  test('toJson', () {
    const encoder = JsonEncoder();
    expectThat(encoder.convert({
      'zero': Decimal.zero,
      'one': Decimal.one,
    })).equals(
      '{'
      '"zero":"${Decimal.zero}",'
      '"one":"${Decimal.one}"'
      '}',
    );
  });

  test('Rational.hasFinitePrecision', () {
    const p = Rational.parse;
    for (final r in [
      p('100'),
      p('100.100'),
      p('1') / p('5'),
      (p('1') / p('3')) * p('3'),
      p('0.00000000000000000000001'),
    ]) {
      expectThat(r.hasFinitePrecision).isTrue;
    }
    for (final r in [p('1') / p('3')]) {
      expectThat(r.hasFinitePrecision).isFalse;
    }
  });

  test('Rational.toDecimal', () {
    Rational r(int numerator, int denominator) =>
        Rational.fromInt(numerator, denominator);
    expectThat(r(1, 1).toDecimal()).equals(dec('1'));
    expectThat(() => r(1, 3).toDecimal()).throwsA<AssertionError>();
    expectThat(r(1, 3).toDecimal(scaleOnInfinitePrecision: 1))
        .equals(dec('0.3'));
    expectThat(r(1, 4).toDecimal(scaleOnInfinitePrecision: 1))
        .equals(dec('0.25'));
    expectThat(r(2, 3).toDecimal(
      scaleOnInfinitePrecision: 1,
      toBigInt: (v) => v.round(),
    )).equals(dec('0.7'));
  });
}


================================================
FILE: test/intl_test.dart
================================================
// Copyright 2013 Alexandre Ardhuin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:math';

import 'package:decimal/decimal.dart';
import 'package:decimal/intl.dart';
import 'package:expector/expector.dart';
import 'package:intl/intl.dart';
import 'package:test/test.dart' show group, test;

Decimal dec(String value) => Decimal.parse(value);

void main() {
  group('DecimalFormatter.format', () {
    test('outputs the same result as with double', () {
      final formats = <NumberFormat>[
        NumberFormat.decimalPattern('en-US'),
        NumberFormat.decimalPattern('fr-FR'),
      ];
      final numbers = <String>[
        '0',
        '1',
        '-1.123',
        '123456789.0123',
      ];
      for (var format in formats) {
        final formatter = DecimalFormatter(format);
        for (var number in numbers) {
          expectThat(formatter.format(dec(number)))
              .equals(format.format(double.parse(number)));
        }
      }
    });

    test('outputs result for long decimal', () {
      final format = NumberFormat.decimalPattern('en-US');
      final formatter = DecimalFormatter(format);
      expectThat(formatter.format(dec(
              '12345678901234567890123456789012345678901234567890.1234567890123456789012345678901234567890123456789')))
          .equals(
              '12,345,678,901,234,567,890,123,456,789,012,345,678,901,234,567,890.123');
    });

    test('outputs the same result as origin', () {
      // intl doesn't work with maximumFractionDigits > 15 on web and > 18 otherwise
      const maxPreciseWebInt = 0x20000000000000;
      final maxFractionalDigitsForIntl = log(maxPreciseWebInt) ~/ log(10);
      final format = NumberFormat()
        ..turnOffGrouping()
        ..maximumFractionDigits = maxFractionalDigitsForIntl;
      final formatter = DecimalFormatter(format);
      final numbers = <String>[
        '0',
        '1',
        '-1.123',
        '123456789.0123',
      ];
      for (var number in numbers) {
        expectThat(formatter.format(dec(number))).equals(number);
      }

      expectThat(formatter.format(dec(
              '12345678901234567890123456789012345678901234567890.1234567890123456789012345678901234567890123456789')))
          .equals(
              '12345678901234567890123456789012345678901234567890.123456789012346');
    });

    test('with compactCurrency outputs the correct results', () {
      final format = NumberFormat.compactCurrency(locale: 'en-US', symbol: '');
      final formatter = DecimalFormatter(format);
      expectThat(formatter.format(dec('1000000000'))).equals('1B');
    });

    test('with currencyFormatter', () {
      final currencyFormatter = DecimalFormatter(NumberFormat.compact());
      expectThat(currencyFormatter.format(dec('1000'))).equals('1K');
      expectThat(currencyFormatter.format(dec('1000.1'))).equals('1K');
      expectThat(currencyFormatter.format(dec('1234567890.1234')))
          .equals('1.23B');
    });
  });
  group('DecimalFormatter.parse', () {
    test('handle invalid Decimal', () {
      final plainFormatter = DecimalFormatter(NumberFormat());
      expectThat(() => plainFormatter.parse('NaN')).throwsA<FormatException>();
      expectThat(plainFormatter.tryParse('NaN')).isNull;
      expectThat(() => plainFormatter.parse('a')).throwsA<FormatException>();
      expectThat(plainFormatter.tryParse('a')).isNull;
      expectThat(() => plainFormatter.parse('+Infinity'))
          .throwsA<FormatException>();
      expectThat(plainFormatter.tryParse('+Infinity')).isNull;
    });
    test('can parse plain decimal', () {
      final plainFormatter = DecimalFormatter(NumberFormat());
      expectThat(plainFormatter.parse('3.14')).equals(dec('3.14'));
      expectThat(plainFormatter.parse('03.14')).equals(dec('3.14'));
      expectThat(plainFormatter.parse('-3.14')).equals(-dec('3.14'));
      expectThat(plainFormatter.tryParse('3.14')).equals(dec('3.14'));
      expectThat(plainFormatter.tryParse('03.14')).equals(dec('3.14'));
      expectThat(plainFormatter.tryParse('-3.14')).equals(-dec('3.14'));
      expectThat(plainFormatter.tryParse('qsfd')).isNull;
    });

    test('can parse currency decimal', () {
      final currencyFormatter =
          DecimalFormatter(NumberFormat.simpleCurrency(name: 'USD'));
      expectThat(currencyFormatter.parse(r'$3.14')).equals(dec('3.14'));
      expectThat(currencyFormatter.parse(r'$03.14')).equals(dec('3.14'));
      expectThat(currencyFormatter.parse(r'-$3.14')).equals(-dec('3.14'));
      expectThat(currencyFormatter.tryParse(r'$3.14')).equals(dec('3.14'));
      expectThat(currencyFormatter.tryParse(r'$03.14')).equals(dec('3.14'));
      expectThat(currencyFormatter.tryParse(r'-$3.14')).equals(-dec('3.14'));
      expectThat(currencyFormatter.tryParse('qsfd')).isNull;
    });
  });
}