1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/decimal/Decimal.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,213 @@
1.4 +/*
1.5 + * Copyright (C) 2012 Google Inc. All rights reserved.
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions are
1.9 + * met:
1.10 + *
1.11 + * * Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + * * Redistributions in binary form must reproduce the above
1.14 + * copyright notice, this list of conditions and the following disclaimer
1.15 + * in the documentation and/or other materials provided with the
1.16 + * distribution.
1.17 + * * Neither the name of Google Inc. nor the names of its
1.18 + * contributors may be used to endorse or promote products derived from
1.19 + * this software without specific prior written permission.
1.20 + *
1.21 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.22 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.23 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.24 + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
1.25 + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
1.26 + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
1.27 + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.28 + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.29 + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.30 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
1.31 + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.32 + */
1.33 +
1.34 +/**
1.35 + * Imported from:
1.36 + * http://src.chromium.org/viewvc/blink/trunk/Source/core/platform/Decimal.h
1.37 + * Check hg log for the svn rev of the last update from Blink core.
1.38 + */
1.39 +
1.40 +#ifndef Decimal_h
1.41 +#define Decimal_h
1.42 +
1.43 +#include "mozilla/Assertions.h"
1.44 +#include <stdint.h>
1.45 +#include "mozilla/Types.h"
1.46 +
1.47 +#include <string>
1.48 +
1.49 +#ifndef ASSERT
1.50 +#define DEFINED_ASSERT_FOR_DECIMAL_H 1
1.51 +#define ASSERT MOZ_ASSERT
1.52 +#endif
1.53 +
1.54 +// To use WTF_MAKE_FAST_ALLOCATED we'd need:
1.55 +// http://src.chromium.org/viewvc/blink/trunk/Source/wtf/FastMalloc.h
1.56 +// Since we don't allocate Decimal objects, no need.
1.57 +#define WTF_MAKE_FAST_ALLOCATED \
1.58 + void ignore_this_dummy_method() MOZ_DELETE
1.59 +
1.60 +namespace WebCore {
1.61 +
1.62 +namespace DecimalPrivate {
1.63 +class SpecialValueHandler;
1.64 +}
1.65 +
1.66 +// This class represents decimal base floating point number.
1.67 +//
1.68 +// FIXME: Once all C++ compiler support decimal type, we should replace this
1.69 +// class to compiler supported one. See below URI for current status of decimal
1.70 +// type for C++: // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1977.html
1.71 +class Decimal {
1.72 + WTF_MAKE_FAST_ALLOCATED;
1.73 +public:
1.74 + enum Sign {
1.75 + Positive,
1.76 + Negative,
1.77 + };
1.78 +
1.79 + // You should not use EncodedData other than unit testing.
1.80 + class EncodedData {
1.81 + // For accessing FormatClass.
1.82 + friend class Decimal;
1.83 + friend class DecimalPrivate::SpecialValueHandler;
1.84 + public:
1.85 + EncodedData(Sign, int exponent, uint64_t coefficient);
1.86 +
1.87 + bool operator==(const EncodedData&) const;
1.88 + bool operator!=(const EncodedData& another) const { return !operator==(another); }
1.89 +
1.90 + uint64_t coefficient() const { return m_coefficient; }
1.91 + int countDigits() const;
1.92 + int exponent() const { return m_exponent; }
1.93 + bool isFinite() const { return !isSpecial(); }
1.94 + bool isInfinity() const { return m_formatClass == ClassInfinity; }
1.95 + bool isNaN() const { return m_formatClass == ClassNaN; }
1.96 + bool isSpecial() const { return m_formatClass == ClassInfinity || m_formatClass == ClassNaN; }
1.97 + bool isZero() const { return m_formatClass == ClassZero; }
1.98 + Sign sign() const { return m_sign; }
1.99 + void setSign(Sign sign) { m_sign = sign; }
1.100 +
1.101 + private:
1.102 + enum FormatClass {
1.103 + ClassInfinity,
1.104 + ClassNormal,
1.105 + ClassNaN,
1.106 + ClassZero,
1.107 + };
1.108 +
1.109 + EncodedData(Sign, FormatClass);
1.110 + FormatClass formatClass() const { return m_formatClass; }
1.111 +
1.112 + uint64_t m_coefficient;
1.113 + int16_t m_exponent;
1.114 + FormatClass m_formatClass;
1.115 + Sign m_sign;
1.116 + };
1.117 +
1.118 + MFBT_API Decimal(int32_t = 0);
1.119 + MFBT_API Decimal(Sign, int exponent, uint64_t coefficient);
1.120 + MFBT_API Decimal(const Decimal&);
1.121 +
1.122 + MFBT_API Decimal& operator=(const Decimal&);
1.123 + MFBT_API Decimal& operator+=(const Decimal&);
1.124 + MFBT_API Decimal& operator-=(const Decimal&);
1.125 + MFBT_API Decimal& operator*=(const Decimal&);
1.126 + MFBT_API Decimal& operator/=(const Decimal&);
1.127 +
1.128 + MFBT_API Decimal operator-() const;
1.129 +
1.130 + MFBT_API bool operator==(const Decimal&) const;
1.131 + MFBT_API bool operator!=(const Decimal&) const;
1.132 + MFBT_API bool operator<(const Decimal&) const;
1.133 + MFBT_API bool operator<=(const Decimal&) const;
1.134 + MFBT_API bool operator>(const Decimal&) const;
1.135 + MFBT_API bool operator>=(const Decimal&) const;
1.136 +
1.137 + MFBT_API Decimal operator+(const Decimal&) const;
1.138 + MFBT_API Decimal operator-(const Decimal&) const;
1.139 + MFBT_API Decimal operator*(const Decimal&) const;
1.140 + MFBT_API Decimal operator/(const Decimal&) const;
1.141 +
1.142 + int exponent() const
1.143 + {
1.144 + ASSERT(isFinite());
1.145 + return m_data.exponent();
1.146 + }
1.147 +
1.148 + bool isFinite() const { return m_data.isFinite(); }
1.149 + bool isInfinity() const { return m_data.isInfinity(); }
1.150 + bool isNaN() const { return m_data.isNaN(); }
1.151 + bool isNegative() const { return sign() == Negative; }
1.152 + bool isPositive() const { return sign() == Positive; }
1.153 + bool isSpecial() const { return m_data.isSpecial(); }
1.154 + bool isZero() const { return m_data.isZero(); }
1.155 +
1.156 + MFBT_API Decimal abs() const;
1.157 + MFBT_API Decimal ceiling() const;
1.158 + MFBT_API Decimal floor() const;
1.159 + MFBT_API Decimal remainder(const Decimal&) const;
1.160 + MFBT_API Decimal round() const;
1.161 +
1.162 + MFBT_API double toDouble() const;
1.163 + // Note: toString method supports infinity and nan but fromString not.
1.164 + MFBT_API std::string toString() const;
1.165 + MFBT_API bool toString(char* strBuf, size_t bufLength) const;
1.166 +
1.167 + static MFBT_API Decimal fromDouble(double);
1.168 + // fromString supports following syntax EBNF:
1.169 + // number ::= sign? digit+ ('.' digit*) (exponent-marker sign? digit+)?
1.170 + // | sign? '.' digit+ (exponent-marker sign? digit+)?
1.171 + // sign ::= '+' | '-'
1.172 + // exponent-marker ::= 'e' | 'E'
1.173 + // digit ::= '0' | '1' | ... | '9'
1.174 + // Note: fromString doesn't support "infinity" and "nan".
1.175 + static MFBT_API Decimal fromString(const std::string& aValue);
1.176 + static MFBT_API Decimal infinity(Sign);
1.177 + static MFBT_API Decimal nan();
1.178 + static MFBT_API Decimal zero(Sign);
1.179 +
1.180 + // You should not use below methods. We expose them for unit testing.
1.181 + MFBT_API explicit Decimal(const EncodedData&);
1.182 + const EncodedData& value() const { return m_data; }
1.183 +
1.184 +private:
1.185 + struct AlignedOperands {
1.186 + uint64_t lhsCoefficient;
1.187 + uint64_t rhsCoefficient;
1.188 + int exponent;
1.189 + };
1.190 +
1.191 + MFBT_API Decimal(double);
1.192 + MFBT_API Decimal compareTo(const Decimal&) const;
1.193 +
1.194 + static MFBT_API AlignedOperands alignOperands(const Decimal& lhs, const Decimal& rhs);
1.195 + static inline Sign invertSign(Sign sign) { return sign == Negative ? Positive : Negative; }
1.196 +
1.197 + Sign sign() const { return m_data.sign(); }
1.198 +
1.199 + EncodedData m_data;
1.200 +};
1.201 +
1.202 +} // namespace WebCore
1.203 +
1.204 +namespace mozilla {
1.205 + typedef WebCore::Decimal Decimal;
1.206 +}
1.207 +
1.208 +#undef WTF_MAKE_FAST_ALLOCATED
1.209 +
1.210 +#ifdef DEFINED_ASSERT_FOR_DECIMAL_H
1.211 +#undef DEFINED_ASSERT_FOR_DECIMAL_H
1.212 +#undef ASSERT
1.213 +#endif
1.214 +
1.215 +#endif // Decimal_h
1.216 +
