Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/DecimalNumber.h

-/*
- * Copyright (C) 2010 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
- */
-
-#ifndef DecimalNumber_h
-#define DecimalNumber_h
-
-#include <math.h>
-#include <wtf/dtoa.h>
-#include <wtf/MathExtras.h>
-#include <wtf/text/WTFString.h>
-
-namespace WTF {
-
-enum RoundingSignificantFiguresType { RoundingSignificantFigures };
-enum RoundingDecimalPlacesType { RoundingDecimalPlaces };
-
-class DecimalNumber {
-public:
-    DecimalNumber(double d)
-    {
-        ASSERT(std::isfinite(d));
-        dtoa(m_significand, d, m_sign, m_exponent, m_precision);
-
-        ASSERT(m_precision);
-        // Zero should always have exponent 0.
-        ASSERT(m_significand[0] != '0' || !m_exponent);
-        // No values other than zero should have a leading zero.
-        ASSERT(m_significand[0] != '0' || m_precision == 1);
-        // No values other than zero should have trailing zeros.
-        ASSERT(m_significand[0] == '0' || m_significand[m_precision - 1] != '0');
-    }
-
-    DecimalNumber(double d, RoundingSignificantFiguresType, unsigned significantFigures)
-    {
-        ASSERT(std::isfinite(d));
-        dtoaRoundSF(m_significand, d, significantFigures, m_sign, m_exponent, m_precision);
-
-        ASSERT_WITH_SECURITY_IMPLICATION(significantFigures && significantFigures <= sizeof(DtoaBuffer));
-        while (m_precision < significantFigures)
-            m_significand[m_precision++] = '0';
-
-        ASSERT(m_precision);
-        // Zero should always have exponent 0.
-        ASSERT(m_significand[0] != '0' || !m_exponent);
-    }
-
-    DecimalNumber(double d, RoundingDecimalPlacesType, unsigned decimalPlaces)
-    {
-        ASSERT(std::isfinite(d));
-        dtoaRoundDP(m_significand, d, decimalPlaces, m_sign, m_exponent, m_precision);
-
-        unsigned significantFigures = 1 + m_exponent + decimalPlaces;
-        ASSERT_WITH_SECURITY_IMPLICATION(significantFigures && significantFigures <= sizeof(DtoaBuffer));
-        while (m_precision < significantFigures)
-            m_significand[m_precision++] = '0';
-
-        ASSERT(m_precision);
-        // Zero should always have exponent 0.
-        ASSERT(m_significand[0] != '0' || !m_exponent);
-    }
-
-    WTF_EXPORT_PRIVATE unsigned bufferLengthForStringDecimal() const;
-    WTF_EXPORT_PRIVATE unsigned bufferLengthForStringExponential() const;
-
-    WTF_EXPORT_PRIVATE unsigned toStringDecimal(LChar* buffer, unsigned bufferLength) const;
-    WTF_EXPORT_PRIVATE unsigned toStringExponential(LChar* buffer, unsigned bufferLength) const;
-
-    bool sign() const { return m_sign; }
-    int exponent() const { return m_exponent; }
-    const char* significand() const { return m_significand; } // significand contains precision characters, is not null-terminated.
-    unsigned precision() const { return m_precision; }
-
-private:
-    bool m_sign;
-    int m_exponent;
-    DtoaBuffer m_significand;
-    unsigned m_precision;
-};
-
-} // namespace WTF
-
-using WTF::DecimalNumber;
-using WTF::RoundingSignificantFigures;
-using WTF::RoundingDecimalPlaces;
-
-#endif // DecimalNumber_h