chromium/third_party/blink/renderer/platform/wtf/decimal.cc

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "third_party/blink/renderer/platform/wtf/decimal.h"

#include <algorithm>
#include <cfloat>

#include "base/notreached.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"

namespace blink {

namespace {

constexpr int kExponentMax = …;
constexpr int kExponentMin = …;
constexpr int kPrecision = …;

constexpr uint64_t kMaxCoefficient = …0xDE0B6B3A763FFFF);  // 999999999999999999 == 18 9's

// This class handles Decimal special values.
class SpecialValueHandler { … };

SpecialValueHandler::SpecialValueHandler(const Decimal& lhs, const Decimal& rhs)
    : … { … }

SpecialValueHandler::HandleResult SpecialValueHandler::Handle() { … }

Decimal SpecialValueHandler::Value() const { … }

// This class is used for 128 bit unsigned integer arithmetic.
class UInt128 { … };

UInt128& UInt128::operator/=(const uint32_t divisor) { … }

// Returns high 64bit of 128bit product.
uint64_t UInt128::MultiplyHigh(uint64_t u, uint64_t v) { … }

static int CountDigits(uint64_t x) { … }

static uint64_t ScaleDown(uint64_t x, int n) { … }

static uint64_t ScaleUp(uint64_t x, int n) { … }

}  // namespace

Decimal::EncodedData::EncodedData(Sign sign, FormatClass format_class)
    : … { … }

Decimal::EncodedData::EncodedData(Sign sign, int exponent, uint64_t coefficient)
    : … { … }

bool Decimal::EncodedData::operator==(const EncodedData& another) const { … }

Decimal::Decimal(int32_t i32)
    : … { … }

Decimal::Decimal(Sign sign, int exponent, uint64_t coefficient)
    : … { … }

Decimal::Decimal(const EncodedData& data) : … { … }

Decimal::Decimal(const Decimal& other) = default;

Decimal& Decimal::operator=(const Decimal& other) = default;

Decimal& Decimal::operator+=(const Decimal& other) { … }

Decimal& Decimal::operator-=(const Decimal& other) { … }

Decimal& Decimal::operator*=(const Decimal& other) { … }

Decimal& Decimal::operator/=(const Decimal& other) { … }

Decimal Decimal::operator-() const { … }

Decimal Decimal::operator+(const Decimal& rhs) const { … }

Decimal Decimal::operator-(const Decimal& rhs) const { … }

Decimal Decimal::operator*(const Decimal& rhs) const { … }

Decimal Decimal::operator/(const Decimal& rhs) const { … }

bool Decimal::operator==(const Decimal& rhs) const { … }

bool Decimal::operator!=(const Decimal& rhs) const { … }

bool Decimal::operator<(const Decimal& rhs) const { … }

bool Decimal::operator<=(const Decimal& rhs) const { … }

bool Decimal::operator>(const Decimal& rhs) const { … }

bool Decimal::operator>=(const Decimal& rhs) const { … }

Decimal Decimal::Abs() const { … }

Decimal::AlignedOperands Decimal::AlignOperands(const Decimal& lhs,
                                                const Decimal& rhs) { … }

static bool IsMultiplePowersOfTen(uint64_t coefficient, int n) { … }

// Round toward positive infinity.
Decimal Decimal::Ceil() const { … }

Decimal Decimal::CompareTo(const Decimal& rhs) const { … }

// Round toward negative infinity.
Decimal Decimal::Floor() const { … }

Decimal Decimal::FromDouble(double double_value) { … }

Decimal Decimal::FromString(const String& str) { … }

Decimal Decimal::Infinity(const Sign sign) { … }

Decimal Decimal::Nan() { … }

Decimal Decimal::Remainder(const Decimal& rhs) const { … }

Decimal Decimal::Round() const { … }

double Decimal::ToDouble() const { … }

String Decimal::ToString() const { … }

Decimal Decimal::Zero(Sign sign) { … }

std::ostream& operator<<(std::ostream& ostream, const Decimal& decimal) { … }

}  // namespace blink