mirror of https://github.com/axmolengine/axmol.git
214 lines
7.3 KiB
C++
214 lines
7.3 KiB
C++
/*
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* Copyright (C) 2012 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright 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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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Imported from:
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* http://src.chromium.org/viewvc/blink/trunk/Source/core/platform/Decimal.h
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* Check hg log for the svn rev of the last update from Blink core.
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*/
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#ifndef Decimal_h
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#define Decimal_h
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#include "mozilla/Assertions.h"
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#include "mozilla/StandardInteger.h"
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#include "mozilla/Types.h"
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#include <string>
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#ifndef ASSERT
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#define DEFINED_ASSERT_FOR_DECIMAL_H 1
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#define ASSERT MOZ_ASSERT
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#endif
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// To use WTF_MAKE_FAST_ALLOCATED we'd need:
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// http://src.chromium.org/viewvc/blink/trunk/Source/wtf/FastMalloc.h
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// Since we don't allocate Decimal objects, no need.
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#define WTF_MAKE_FAST_ALLOCATED \
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void ignore_this_dummy_method() MOZ_DELETE
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namespace WebCore {
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namespace DecimalPrivate {
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class SpecialValueHandler;
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}
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// This class represents decimal base floating point number.
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//
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// FIXME: Once all C++ compiler support decimal type, we should replace this
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// class to compiler supported one. See below URI for current status of decimal
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// type for C++: // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1977.html
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class Decimal {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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enum Sign {
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Positive,
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Negative,
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};
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// You should not use EncodedData other than unit testing.
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class EncodedData {
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// For accessing FormatClass.
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friend class Decimal;
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friend class DecimalPrivate::SpecialValueHandler;
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public:
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EncodedData(Sign, int exponent, uint64_t coefficient);
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bool operator==(const EncodedData&) const;
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bool operator!=(const EncodedData& another) const { return !operator==(another); }
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uint64_t coefficient() const { return m_coefficient; }
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int countDigits() const;
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int exponent() const { return m_exponent; }
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bool isFinite() const { return !isSpecial(); }
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bool isInfinity() const { return m_formatClass == ClassInfinity; }
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bool isNaN() const { return m_formatClass == ClassNaN; }
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bool isSpecial() const { return m_formatClass == ClassInfinity || m_formatClass == ClassNaN; }
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bool isZero() const { return m_formatClass == ClassZero; }
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Sign sign() const { return m_sign; }
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void setSign(Sign sign) { m_sign = sign; }
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private:
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enum FormatClass {
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ClassInfinity,
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ClassNormal,
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ClassNaN,
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ClassZero,
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};
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EncodedData(Sign, FormatClass);
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FormatClass formatClass() const { return m_formatClass; }
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uint64_t m_coefficient;
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int16_t m_exponent;
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FormatClass m_formatClass;
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Sign m_sign;
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};
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MFBT_API Decimal(int32_t = 0);
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MFBT_API Decimal(Sign, int exponent, uint64_t coefficient);
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MFBT_API Decimal(const Decimal&);
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MFBT_API Decimal& operator=(const Decimal&);
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MFBT_API Decimal& operator+=(const Decimal&);
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MFBT_API Decimal& operator-=(const Decimal&);
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MFBT_API Decimal& operator*=(const Decimal&);
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MFBT_API Decimal& operator/=(const Decimal&);
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MFBT_API Decimal operator-() const;
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MFBT_API bool operator==(const Decimal&) const;
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MFBT_API bool operator!=(const Decimal&) const;
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MFBT_API bool operator<(const Decimal&) const;
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MFBT_API bool operator<=(const Decimal&) const;
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MFBT_API bool operator>(const Decimal&) const;
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MFBT_API bool operator>=(const Decimal&) const;
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MFBT_API Decimal operator+(const Decimal&) const;
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MFBT_API Decimal operator-(const Decimal&) const;
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MFBT_API Decimal operator*(const Decimal&) const;
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MFBT_API Decimal operator/(const Decimal&) const;
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int exponent() const
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{
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ASSERT(isFinite());
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return m_data.exponent();
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}
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bool isFinite() const { return m_data.isFinite(); }
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bool isInfinity() const { return m_data.isInfinity(); }
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bool isNaN() const { return m_data.isNaN(); }
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bool isNegative() const { return sign() == Negative; }
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bool isPositive() const { return sign() == Positive; }
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bool isSpecial() const { return m_data.isSpecial(); }
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bool isZero() const { return m_data.isZero(); }
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MFBT_API Decimal abs() const;
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MFBT_API Decimal ceiling() const;
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MFBT_API Decimal floor() const;
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MFBT_API Decimal remainder(const Decimal&) const;
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MFBT_API Decimal round() const;
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MFBT_API double toDouble() const;
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// Note: toString method supports infinity and nan but fromString not.
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MFBT_API std::string toString() const;
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MFBT_API bool toString(char* strBuf, size_t bufLength) const;
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static MFBT_API Decimal fromDouble(double);
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// fromString supports following syntax EBNF:
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// number ::= sign? digit+ ('.' digit*) (exponent-marker sign? digit+)?
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// | sign? '.' digit+ (exponent-marker sign? digit+)?
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// sign ::= '+' | '-'
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// exponent-marker ::= 'e' | 'E'
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// digit ::= '0' | '1' | ... | '9'
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// Note: fromString doesn't support "infinity" and "nan".
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static MFBT_API Decimal fromString(const std::string& aValue);
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static MFBT_API Decimal infinity(Sign);
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static MFBT_API Decimal nan();
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static MFBT_API Decimal zero(Sign);
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// You should not use below methods. We expose them for unit testing.
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MFBT_API explicit Decimal(const EncodedData&);
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const EncodedData& value() const { return m_data; }
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private:
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struct AlignedOperands {
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uint64_t lhsCoefficient;
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uint64_t rhsCoefficient;
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int exponent;
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};
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MFBT_API Decimal(double);
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MFBT_API Decimal compareTo(const Decimal&) const;
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static MFBT_API AlignedOperands alignOperands(const Decimal& lhs, const Decimal& rhs);
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static inline Sign invertSign(Sign sign) { return sign == Negative ? Positive : Negative; }
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Sign sign() const { return m_data.sign(); }
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EncodedData m_data;
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};
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} // namespace WebCore
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namespace mozilla {
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typedef WebCore::Decimal Decimal;
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}
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#undef WTF_MAKE_FAST_ALLOCATED
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#ifdef DEFINED_ASSERT_FOR_DECIMAL_H
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#undef DEFINED_ASSERT_FOR_DECIMAL_H
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#undef ASSERT
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#endif
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#endif // Decimal_h
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